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Tektronix* 

COMMITTED TO EXCELLENCE 



WARNING 

THE FOLLOWING SERVICING INSTRUCTIONS 
ARE FOR USE BY QUALIFIED PERSONNEL ONLY. 
TO AVOID PERSONAL INJURY, DO NOT 
PERFORM ANY SERVICING OTHER THAN THAT 
CONTAINED IN OPERATING INSTRUCTIONS 
UNLESS YOU ARE QUALIFIED TO DO SO. 



PLEASE CHECK FOR CHANGE INFORMATION 
AT THE REAR OF THIS MANUAL 



7844/R7844 

DUAL-BEAM 

OSCILLOSCOPE 

WITH OPTIONS 

SERVICE 



INSTRUCTION MANUAL 



Tektronix, Inc. 






P.O. Box 500 






Beaverton, Oregon 97077 


Serial Number _ 




070-1676-02 




First Printing SEP 1974 


Product Group 42 




Revised OCT 1981 






Copyright© 1974, 1981 Tektronix, Inc. All rights reserved. 
Contents of this publication may not be reproduced in 
any form without the written permission of T ektronix, I nc. 



Inc. and its subsidiaries an 
reign patents and/or pendim 



Products of Tektronix, 
covered by U.S. and f 
patents. 

TEKTRONIX, TEK, SCOPE-MOBILE, and TO* are 
registered trademarks of Tektronix, Inc. TELEQUIP- 
MENT is a registered trademark of Tektronix U K 
Limited. 



Printed in U.S.A. Specification and price change 
privileges are reserved. 








7844/R7844 Service 



TABLE OF CONTENTS 



LIST OF ILLUSTRATIONS 
LIST OF TABLES 
OPERATORS SAFETY SUMMARY 
SERVICE SAFETY SUMMARY 

Section 1 SPECIFICATION 

Introduction 

System Electrical Specification 
Standard Accessories 



Section 2 OPERATING INFORMATION 

Features 

Controls and Connectors 

Safety Information 

Operating Voltage 

Front-Panel Controls, Connectors, and 

Indicators 

Rear-Panel Controls and Connectors . . 

Operating Temperature 

Rackmounting 

Plug-In Units 

Installation of Plug-In Units 

Repackaging for Shipment 



Page 




Page 


iii 


Main Interface 


. 3-7 


V 


Logic 


. 3-9 




Trigger Selector 


. 3-18 


vi 


Crossover Vertical Interface 


. 3-19 


vii 


Dedicated Vertical Interface (Option 21 






Only) 


. 3-21 




Beam 1 Vertical Amplifier 


3-22 




Beam 2 Vertical Amplifier 


3-24 




Horizontal Interface 


. 3-25 


i-i 


Beam 1 Horizontal Amplifier 




1-8 


(7844 SN BllOOOO-above; 




1-12 


R7844 SN BlOOOOO-above) 

Beam 1 Horizontal Amplifier 
(7844 SN B109999-below; 


3-26 




R7844 SN B099999-below) 

Beam 2 Horizontal Amplifier 


3-27 


2-1 


(7844 SN BllOOOO-above; 




2-1 


R7844 SN BlOOOOO-above) 


3-29 


2-1 


Beam 2 Horizontal Amplifier 




2-1 


(7844 SN B109999-below; 




R7844 SN B099999-below) 


3-30 




Z-Axis Amplifiers 


3-31 


2-3 


CRT Circuit 


3-31 


2-4 


Output Signals 


3-34 


2-6 


Readout System 


3-34 


2-6 


Converter/Rectifiers 


3-49 


2-6 


Low- Voltage Regulators 


3-55 


2-6 

2-6 


Enhancer (Option 22) 


3-58 



Section 3 THEORY OF OPERATION 

Block Diagram 3-1 

Description 3-1 

Detailed Circuit Operation 3-2 

Logic Fundamentals 3-2 

Symbols 3-2 

Logic Polarity 3-2 

Non-Digital Devices 3-2 

Calibrator and Pulsed Switching 3-2 

Crossover Mode Switch 3-3 

Dedicated Mode Switch (Option 21 
Only) 3-7 



Section 4 PERFORMANCE CHECK 

Preliminary Information 4-1 

Tektronix Field Service 4-1 

Using This Procedure 4-1 

Performance Check Summary 4-1 

Test Equipment Required 4-1 

Special Calibration Fixtures 4-1 

Performance Check Equipment 

Alternatives 4-1 

Signal Connections 4-2 

Performance Check Procedure 4-8 

Index to Performance Check 

Procedure 4-8 

Setup Procedure 4-9 



REV OCT 1981 



i 




7844/R7844 Service 



TABLE OF CONTENTS (cont) 



Page 



Section 5 ADJUSTMENT PROCEDURE 

Preliminary Information 5-1 

Adjustment Interval 5-1 

Tektronix Field Service 5-1 

Using This Procedure 5-1 

Test Equipment Required 5-1 

Special Calibration Fixtures 5-1 

Adjustment Equipment Alternatives . 5-1 

Signal Connections 5-2 

Adjustment Procedure 5-7 

Introduction 5-7 

Index to Adjustment Procedures ... 5-7 
Setup Procedure 5-7 

Section 6 MAINTENANCE 

Introduction 6-1 

Panel Removal 6-1 

Preventive Maintenance 6-1 

Cleaning 6-1 

Visual Inspection 6-2 

Semiconductor Checks 6-2 

Recalibration 6-2 



Page 



Troubleshooting 6-2 

Troubleshooting Equipment 6-3 

Troubleshooting Techniques 6-3 

Corrective Maintenance 6-7 

Obtaining Replacement Parts 6-7 

Soldering Techniques 6-7 

Component Removal and 

Replacement 6-8 

Recalibration After Repair 6-18 

Instrument Repackaging 6-20 



Section 7 


INSTRUMENT OPTIONS 


Section 8 


REPLACEABLE ELECTRICAL PARTS 


Section 9 


DIAGRAMS AND CIRCUIT BOARD 
ILLUSTRATIONS 


Section 10 


REPLACEABLE MECHANICAL PARTS 


CHANGE INFORMATION 



REV JUN 1981 




7844/R7844 Service 



LIST OF ILLUSTRATIONS 



Fig. 

No. 

1-1 

1-2 

2-1 

2-2 

3-1 

3-2 

3-3 

3-4 

3-5 

3-6 



3-7 

3-8 

3-9 

3-10 

3-11 

3-12 

3-13 

3-14 

3-15 

3-16 

3-17 

3-18 

3-19 



Fig 

Page No. 

7844 dimensional drawing 1-13 3-20 

R7844 dimensional drawing 1-14 

Front-panel controls and connectors 2-2 

Rear-panel controls and connectors 2-5 

Detailed block diagram of Crossover Mode 3-21 

Switch circuits 3-4 

Input/output conditions for plug-in unit alter- 
nate switching 3-6 

Input/output conditions for Readout Display 3-22 

Logic stage 3-7 

Detailed block diagram of Dedicated Mode 

Switch (Option 21 only) 3-8 

Input/output conditions for Readout Display 3-23 

Logic 3-9 3-24 

(A) Diagram of Clock Generation stage; 

(B) Idealized waveforms for Clock Genera- 3-25 

tor stage 3-11 

Idealized waveforms for Chop Blanking 

stage 3-11 3-26 

Timing diagram for End of AB Alternate Log- 
ic 3-13 3-27 

Functional diagram of Left and Right Vertical 3-28 

Alternate Switching stages 3-14 

Input/output conditions for Horizontal Logic 3-29 

Alternate Switching 3-16 

Functional diagram of Beam 1 Z-Axis Logic 3-30 

(U335) 3-16 

Functional diagram of Beam 2 Z-Axis Logic 3-31 

(U375) 3-17 

Detailed block diagram of Trigger Selector 

circuit 3-19 3-32 

Detailed block diagram of the Crossover Ver- 
tical Interface circuit 3-20 3-33 

Detailed block diagram of the Dedicated Ver- 
tical Interface circuit 3-22 3-34 

Detailed block diagram of the Beam 1 Verti- 
cal Amplifier circuit 3-23 

Detailed block diagram of the Beam 2 Verti- 3-35 

cal Amplifier circuit 3-24 

Detailed block diagram of the Horizontal In- 
terface circuit 3-25 

Detailed block diagram of the Beam 1 Hori- 3-36 

zontal Amplifier circuit (for instruments 7844 
SN B1 1 0000-above; R7844 SN B1 00000- 3-37 

above) 3-26 



Page 



Detailed block diagram of the Beam 1 Hori- 
zontal Amplifier circuit (for instruments 7844 
SN B1 09999-below; R7844 SN B099999- 

below) 3-28 

Detailed block diagram of the Beam 2 Hori- 
zontal Amplifier circuit (for instruments 7844 
SN B11 0000-above; R7844 SN B1 00000- 

above) 3-29 

Detailed block diagram of the Beam 2 Hori- 
zontal Amplifier circuit (for instruments 7844 
SN B1 09999-below; R7844 SN B099999- 

below) 3-30 

Detailed block diagram of CRT circuit .... 3-32 
Location of readout display on the crt identi- 
fying the originating plug-in and channel . . 3-35 
Typical readout display where only channel 2 
of the Right Vertical dnd B Horizontal units is 

displayed 3-35 

Character selection matrix for 7844/R7844 

Readout system 3-36 

Output waveforms of Timer stage 3-38 

Detail of output at pins 12, 13, 14 and 16 of 

U2126 3-39 

Timer stage operation when Display-Skip 

condition occurs 3-40 

Timer relationship of the time-slot (TS) 

pulses produced by U2159 3-41 

Typical encoding scheme for voltage-sensing 
plug-in unit. Coding shown for deflection fac- 
tor of 100 ^V 3-43 

Idealized current waveforms of (A) Row ana- 
log data and (B) Column analog data 3-44 

Block representation of memory sequence in 

U2232 3-46 

Typical output waveforms for Zeros Logic 
and Memory stage operation (at pin 7 of 

U2232) 3-47 

Readout word relating 1 0 possible character 
locations to the decimal point instructions 
that can be encoded, and the resultant crt 

display 3-49 

Flow chart for character generation by the 

Readout System 3-50 

Detailed block diagram of Converter/ 

Rectifiers circuit 3-51 



REV JUN 1981 



iii 




7844/R7844 Service 



LIST OF ILLUSTRATIONS (cont) 



Rg 

No. Page 

3-38 (A) Representation of Inverter stage. Ideal- 

ized waveforms of (B) Total Inverter current 
l ( , (C) voltage at junction of CR1234 and 
CR1241 , and (D) voltage across primary of 



T1310 3-53 

3-39 Detailed block diagram of Low-Voltage Reg- 
ulator circuit 3-56 

3-40 Detailed block diagram of the Enhancer cir- 
cuit (Option 22) 3-58 

5- 1 Readout display with Q2225 removed .... 5-35 

6- 1 7844/R7844 troubleshooting chart 6-4 

6-2 Power unit securing screws 6-8 

6- 3 Exploded-view drawing of a portion of the 

power unit identifying several critical parts. 6-1 1 

7- 1 Location of Readout Mode Switch on 

Readout circuit board 7-5 



The illustrations in Section 9 are located near their associat- 
ed Diagrams on the foldout pages. 

9-1 Semiconductor lead configurations 

9-2 Location of circuit boards in the 7844/R7844 
9-3 A1— Calibrator circuit board assembly 

9-4 A3 — Crossover Mode Switch circuit board 

assembly 

9-5 A4 — Dedicated Mode Switch circuit board 

assembly (Option 21 only) 

9-6 A5 — Main Interface circuit baord assembly 

9-7 A8 — Logic circuit board assembly 

9-8 A9 — Trigger Selector circuit board assembly 

9-9 A10 — Crossover Vertical Interface circuit 

board assembly 

9-1 0 A1 1 — Dedicated Vertical Interface circuit 

board assembly (Option 21 only) 

9-11 A13 — Vertical Amplifier circuit board 

assembly (Beam 1 ) 

9-12 A16 — Vertical Amplifier circuit board 

assembly (Beam 2) 

9-13 A18 — Horizontal Interface circuit board 

assembly 

9-14 A19 — Horizontal Amplifier circuit board as- 

sembly (Beam 1 ) 

9-1 5 A20 — Horizontal Amplifier circuit board as- 

sembly (Beam 2) 



Fig. 

No. 

9-16 A21 — Z-Axis circuit board assembly 

(Beam 1) 

9-1 7 A22 — Z-Axis circuit board assembly 

(Beam 2) 

9-18 A23 — CRT circuit board assembly 

9-19 A24— High Voltage circuit board assembly 

9-20 A25 — Signals Out circuit board assembly 

9-21 A26— Readout circuit board assembly 

9-22 A27 — Power Supply Inverter circuit board 

assembly 

9-23 A28 — Cap-Rectifier circuit board assembly 

9-24 A29 — Low-Voltage Regulator circuit board 

assembly 

9-25 A30 — Fan circuit board assembly 

9-26 A31— Enhancer circuit board assembly 

(Option 22 only) 

9-27 A29 — Location of Low-Voltage power 

supply test points and adjustments 
9-28 A28 — Location of Inverter Control test 

points and adjustments 

9-29 A21 — Location of Beam 1 Z-Axis test points 

and adjustments 

9-30 A22 — Location of Beam 2 Z-Axis test points 

and adjustments 

9-31 A23 — Location of CRT display and 

Geometry adjustments 
9-32 A8 — Location of Y-Axis Alignment 

adjustment 

9-33 A19 — Location of Beam 1 Geometry 

adjustments 

9-34 A20 — Location of Beam 2 Geometry 

adjustments 

9-35 A1 — Location of Calibrator adjustments 

9-36 A19 — Location of Beam 1 Horizontal 

adjustments 

9-37 A20 — Location of Beam 2 Horizontal 

adjustments 

9-38 A10 — Location of Crossover Interface 

adjustments 

9-39 A13 — Location of Beam 1 Vertical 

adjustments 

9-40 A1 6 — Location of Beam 2 Vertical 

adjustments 

9-41 A5— Location of Aux-Y Gain test points 

9-42 A26 — Location of Readout Mode Switch and 

adjustments 

9-43 A20 — Location of Readout Horizontal Cen- 

tering and Gain adjustments 
9-44 A16 — Location of Readout Vertical 

Centering adjustments 



iv 



REV JUN 1981 




7844/R7844 Service 



LIST OF TABLES 



Table 

No. Page 

1-1 Electrical 1-1 

1-2 7844/R7844 Oscilloscope System Vertical 

Specification 1-9 

1-3 7844/R7844 Oscilloscope System Horizontal 

Specification 1-10 

1-4 Special Purpose and Sampling Plug-in Units 1-10 

1-5 Environmental 1-11 

1-6 Physical 1-12 

3-1 Standard Readout Format 3-37 

3- 2 Channel Address Code 3-41 

4- 1 Test Equipment 4-2 

4-2 Performance Check Summary 4-4 



Table 

No. Page 

5-1 Test Equipment 5-2 

5-2 Adjustment Summary 5-5 

5-3 Power Supply Tolerance 5-10 

5-4 Horizontal System High-Frequency Compen- 
sation 5-28 

5-5 Beam 1 High-Frequency Compensation . . . 5-33 

5- 6 Beam 2 High Frequency Compensation . . . 5-34 

6- 1 Power Supply Tolerance 6-6 

6-2 Fuse Information 6-18 

6-3 Cathode-Ray Tube Voltage Presets 6-19 

6- 4 Shipping Carton Test Strength 6-20 

7- 1 Option Information Locator 7-1 



REV JUN 1981 



v 




7844/R7844 Service 



OPERATORS SAFETY SUMMARY 



The general safety information in this part of the summary is for both operating and servicing personnel. Specific warnings 
and cautions will be found throughout the manual where they apply, but may not appear in this summary. 



Terms In This Manual 

CAUTION statements identify conditions or practices that 
could result in damage to the equipment or other property. 



cord into a properly wired receptacle before connecting to 
the product input or output terminals. A protective ground 
connection by way of the grounding conductor in the power 
cord is essential for safe operation. 



WARNING statements identify conditions or practices that 
could result in personal injury or loss of life. 



Terms As Marked on Equipment 

CAUTION indicates a personal injury hazard not immediate- 
ly accessible as one reads the marking, or a hazard to prop- 
erty including the equipment itself. 



DANGER indicates a personal injury hazard immediately ac- 
cessible as one reads the marking. 



Danger Arising From Loss of Ground 

Upon loss of the protective-ground connection, all accessi- 
ble conductive parts (including knobs and controls that may 
appear to be insulating) can render an electric shock. 

Use the Proper Power Cord 

Use only the pov/er cord and connector specified for your 
product. 

Use only a power cord that is in good condition. 



Symbols In This Manual 

For detailed information on power cords and connectors, 

A This symbol indicates where applicable cau- see the Service Safety Summary, 
tionary or other information is to be found. 



Symbols As Marked on Equipment 



(f 



DANGER — High voltage. 




Protective ground (earth) terminal. 




ATTENTION — refer to manual. 



Refer cord and connector changes to qualified service 
personnel. 



Use the Proper Fuse 

To avoid fire hazard, use only the fuse of correct type, volt- 
age rating and current rating as specified in the parts list for 
your product. 



Refer fuse replacement to qualified service personnel. 



Power Source 

This product is intended to operate from a power source 
that does not apply more than 250 volts rms between the 
supply conductors or between either supply conductor and 
ground. A protective ground connection by way of the 
grounding conductor in the power cord is essential for safe 
operation. 

Grounding the Product 

This product is grounded through the grounding conductor 
of the power cord. To avoid electrical shock, plug the power 



Do Not Operate in Explosive Atmospheres 

To avoid explosion, do not operate this product in an explo- 
sive atmosphere unless it has been specifically certified for 
such operation. 



Do Not Remove Covers or Panels 

To avoid personal injury, do not remove the product covers 
or panels. Do not operate the product without the covers 
and panels properly installed. 



VI 



REV JUN 1981 




7844/R7844 Service 



SERVICING SAFETY SUMMARY 

FOR QUALIFIED SERVICE PERSONNEL ONLY 

Refer also to the preceding Operators Safety Summary. 

Do Not Service Alone Disconnect power before removing protective panels, 

soldering, or replacing components. 

Do not perform internal service or adjustment of this 
product unless another person capable of rendering first 
aid and resuscitation is present. Power Source 

This product is intended to operate from a power source 
that does not apply more than 250 volts rms between the 
supply conductors or between either supply conductor 
and ground, A protective ground connection by way of the 
grounding conductor in the power cord is essential for 
safe operation. 






Use Care When Servicing With Power On 

Dangerous voltages exist at several points in this product. 
To avoid personal injury, do not touch exposed connec- 
tions or components while power is on. 



REV JUN 1981 



VII 








7844/R7844 Service 



REV JUN 1981 



7844 DUAL-BEAM OSCILLOSCOPE 



R7844 OPTION 21 DUAL-BEAM OSCILLOSCOPE 



1675-12 




Section 1 — 7844/R7844 Service 



SPECIFICATION 



INTRODUCTION 

Information given in this section of the manual applies to 
both the 7844 and R7844 Dual-Beam Oscilloscopes, except 
as otherwise indicated. The R7844 is electrically identical to 
the 7844, but it is adapted for mounting in a standard 19- 
inch rack. Rackmounting Instructions for the R7844 are giv- 
en in the 7844/R7844 Operators manual. 



This instrument will meet the electrical characteristics 
listed in the Performance Requirement column of Table 1-1 
following complete calibration as given in the Performance 
Check/Calibration section of this manual. The following elec- 



trical characteristics apply over an ambient temperature 
range of 0°C to +50°C, except as otherwise indicated. 
Warmup time for given accuracy is 20 minutes. 



NOTE 

Many of the measurement capabilities of this instru- 
ment are determined by the choice of plug-in units. 
The following characteristics apply to the 7844/R7844 
Oscilloscope only. See the System Specification in 
this section (Tables 1-2 and 1-3) for specifications of 
the complete system. 



Table 1-1 
ELECTRICAL 



Characteristic 


Performance Requirement 


Supplemental Information 




VERTICAL 




Deflection Factor 


Compatible with all 7-series plug-in units 




Accuracy 


1 % or less difference between vertical 
compartments 




Low-Frequency Linearity 


0.1 div or less compression or expansion 
of a center-screen, 2-div signal positioned 
anywhere vertically within the graticule area 




System Bandwidth 


Varies with plug-in selected; see 
7800-Series Oscilloscope Systems 
Specification 

1 


Refer to Table 1 -2 


Isolation Between Beam 1 and 
Beam 2 

All Vertical Modes 


At least 100:1 from dc to 150 MHz and at 
least 30:1 from 150 MHz to 400 MHz 




Delay Line 




Permits viewing the leading edge of 
an internally triggered signal. Delay 
Line not compatible with 7B50-series 
time-base units 



REV JUN 1981 



1-1 




Specification — 7844/R7844 Service 



Table 1-1 (cont) 



Characteristic 


Performance Requirement 


Supplemental Information 


Vertical Display Modes 
7844/R7844 


Plug-in compartment controlling vertical 
deflection of electron beam 


Selected by front-panel VERTICAL 
MODE switch 


BEAM 1 


BEAM 2 


LEFT 


LEFT 


LEFT 


RIGHT 


RIGHT 


LEFT 


RIGHT 


RIGHT 


7 844/ R 7844 Option 21 only 


LEFT 


RIGHT 




Vertical Centering 




Within 0.5 div of graticule center 


Vertical Separation Control Range 
(deleted by Option 21) 




Beam 1 trace can be positioned 
at least +4 and —4 div with 
respect to beam 2 trace 



TRIGGERING 



Trigger Source 




Selected by front-panel A TRIG 
SOURCE and B TRIG SOURCE 
switches 


A HORIZ 


LEFT VERT or RIGHT VERT 
compartment 




B HORIZ 


LEFT VERT or RIGHT VERT 
compartment 





HORIZONTAL 



Deflection Factor 


Compatible with all 7-series plug-in units 




Accuracy 


1 % or less difference between horizontal 
compartments 




Dc Linearity 


.05 division or less at each graticule line after 
adjusting for no error at the second and tenth 
graticule lines 




Fastest Calibrated Sweep Rate 


1 ns/div 




Horizontal Display Modes 


Plug-in compartment controlling horizontal 
deflection of electron beam 


Selected by front-panel HORIZONTAL 
MODE switches 


BEAM 1 


BEAM 2 


A 


A 


A 


B 


B 


A 


B 


B 


Phase Shift Between Vertical and 
Horizontal Deflection Systems 


2° or less from dc to at least 50 kHz 




Bandwidth (10 div reference) 


Dc to at least 1 MHz 




Horizontal Centering 




Within 0.5 div of graticule center 



1-2 



REV JUN 1981 




Specification — 7844/R7844 Service 



Table 1-1 (cont) 


Characteristic 


Performance Requirement 


Supplemental information 


Horizontal Separation Control 
Range 


Beam 1 event can be positioned at least 
0.25 div to the left, 0.25 div to the right, and 
2 div total range with respect to Beam 2 
event 





DISPLAY 



Crt Graticule 






Type 


Internal 




Area 


8 div vertical by 10 div horizontal 
Each div equals 1 cm 




PULSED modes 




Selected by front-panel GRAT 
ILLUM controls 


BEAM 2 GATED 


The graticule illumination is triggered at the 
end of each sweep of beam 2 




EXTERNAL 


The graticule is illuminated momentarily 
when an appropriate remote signal is applied 
to the rear-panel GRAT/READOUT SINGLE 
SHOT connector 




MANUAL 


The graticule is illuminated momentarily 
when the MANUAL push button is pressed 
independently of other PULSED modes 




BEAMFINDER (BEAM 1) 




Limits beam 1 display within the 
graticule area when actuated. The 
beam 1 intensity turns on inde- 
pendently of horizontal plug-in status 


BEAMFINDER (BEAM 2) 




Limits beam 2 display within the 
graticule area when actuated. The 
beam 2 intensity turns on inde- 
pendently of horizontal plug-in status 


Crt Phosphor 


P-31 


P-1 1 available with Option 78 


Minimum Photographic 
Writing Speed with Type 47 
Polaroid Film 
(without film fogging) 




After 5 minutes phosphor delay time 


P-1 1 phosphor Tektronix with 
f 1 .2 Lens and 1:0.5 Object- 
to-lmage Ratio (with 
3000 ASA Polaroid Film) 
Film) 




1 .5 cm/ns 


P-31 Phosphor 




Writing speed for P-31 phosphor is 
approximately 1 /2 the writing speed 
for P-1 1 phosphor in typical 
applications 



REV JUN 1981 



1-3 








Specification — 7844/R7844 Service 



Table 1-1 (cont) 


Characteristic 


Performance Requirement 


Supplemental Information 


With Option 22 Writing Speed 
Enhancer 




Writing speed of 3000 ASA Polaroid 
Film is approximately 3 times 
the specified writing speed 



CALIBRATOR 



Waveshape 


Square wave 




Polarity 


Positive going with baseline near ground 




Source Impedance 




450 U 


Output Voltage 






Into 100 kQ or Greater 


4 mV, 40 mV, 0.4 V, 4 V 


Selected by front-panel CALIBRATOR 
switch 


Into 50 Q 


0.4 mV, 4 mV, 40 mV, 0.4 V 




Output Current 






7844 


40 mA 


Available through front-panel current 
loop when CALIBRATOR switch is 
set to 40 mA 


R7844 


40 mA 


Available through CALIBRATOR 
output with optional bnc-to-Current 
Loop Adapter, 

Tektronix Part No. 012-0341-00. 
CALIBRATOR Switch must be set to 
the 4 V position for 40 mA output 


Amplitude Accuracy 
(p-p voltage and current) 


Within 1% 




Repetition Rate 


1 kHz within 0.25% 




Duty Cycle 


49.8% to 50.2% 




Risetime and Falltime 


250 ns or less into 1 00 pF or less 





SIGNAL OUTPUTS 



A SAWTOOTH 
Source 


Time-base unit in A HORIZ Compartment 




Polarity 

— 




Positive-going with base-line at 0 V 
within 1 V (into 1 mti) 


Output Voltage 
Rate of Rise 
Into 50 Q 


50 mV/unit of time (selected by time-base 
time/div switch) within 15% — 100 ns/div 
maximum 




Into 1 Mft Paralled 
by 150 pF 


1 V/unit of time (selected by time-base 
time/div switch) within 1 0%-1 ^s/div 
maximum 




Output Resistance 




Approximately 950 Q 



1-4 



REV JUN 1981 



Specification — 7844/R7844 Service 



Table 1-1 (cont) 



Characteristic 


Performance Requirement 


Supplemental Information 


B SAWTOOTH 






Source 


Time-base unit in B HORIZ Compartment 




Polarity 




Positive-going with baseline at 0 V 
within 1 V (into 1 MS2) 


Output Voltage 






Rate of Rise 






Into 50 Q 


50 mV/unit of time (selected by 
time-base time/div switch) within 
15% — 100 ns/div maximum 




Into 1 MS2 

Paralleled by 150 pF 


1 V/ unit of time (selected by time-base 
time/div switch) within 1 0%-1 /us/div 
maximum 




Output Resistance 




Approximately 950 St 


A GATE 






Source 


MAIN or DLY’D gates from time- 
base unit installed in the A HORIZ 
compartment 


Selected by rear-panel switch 


MAIN 




Derived from the displayed sweep, 
gate is positive-going with baseline at 
0 V within 0.1 V (into 1 MSi) 


DLY’D 




Derived from the delay gate of those 
time-base units that furnish a delay 
gate (see plug-in unit specification) and 
is a positive level with base line at 0 V 
within 0.1 V (into 1 MSt) — output is 
always positive when no plug-in is 
used 

or plug-in does not provide a delay 
gate 


Output Voltage 






Input 50 f! 


0.5 V within 10% 




Into 1 MJ2 


1 0 V within 1 0% (up to 1 ^s/div) 




Risetime Into 50 St 




5 ns or less 


Output Resistance 




Approximately 950 S2 


B GATE 






Source 


MAIN or DLY’D gates from time- 
base unit installed in the B HORIZ 
compartment 


Selected by rear-panel switch 


MAIN 




Derived from the displayed sweep, 
gate is positive-going with baseline 
at 0 V within 0.1 V (into 1 Mfl) 



REV JUN 1981 



1-5 





















Specification — 7844/R7844 Service 



Table 1-1 (cont) 



Characteristic 


Performance Requirement 


Supplemental Information 


B Gate (cont) 






DLY'D 




Derived from the delay gate of those 
time-base units that furnish a delay 
gate (see plug-in unit specification) 
and is a positive level with baseline 
at 0 V within 0.1 V (into 1 MO) — output 
is always positive when no plugmin is 
used or plug-in does not provide a 
delay gate 


Output Voltage 






Input 50 12 


0.5 V within 10% 




Into 1 M12 


1 0 V within 1 0% (up to 1 /us/div) 




Risetime Into 50 12 




5 ns or less 


Output Resistance 




Approximately 950 0 



BEAM 1 and 2 EXTERNAL Z-AXIS INPUT 



Sensitivity 


2 V p-p provides trace modulation 
over full intensity range 


Approximately 0 V input produces no 
intensity change 


Polarity of Operation 


Positive-going signal decreases trace 
intensity; negative-going signal increases 
trace intensity 




Intensity Circuit Pulse Performance 
(between rear-panel connector and 
crt) 






Low-Frequency Limit 




dc 


Risetime With Negative- 
Going Input arid Falltime with 
Positive-Going Input 




Approximately 1 5 ns 


Propagation Delay 


t 


Approximately 30 ns 


Input Resistance at DC 




Approximately 500 12 


Maximum Safe Input Voltage 


1 


1 5 V (dc + peak ac) 


Maximum Repetition Rate 




1 MHz 



REMOTE CONNECTORS and SWITCHES 


CONTROL ILLUMINATION (for 
plug-in units only) 


HIGH, LOW, OFF 


The three-position switch is located on 
the left side-panel of the R7844 and on 
the rear panel of the 7844 


SINGLE SWEEP RESET (rear 
panel) 




Bnc connector; remote single-sweep 
reset (A and B HORIZ) with compatible 
time-base units 



1-6 



REV JUN 1981 



Specification — 7844/R7844 Service 



Table 1-1 (cont) 



Characteristic 


Performance Requirement 


Supplemental Information 


SINGLE SWEEP RESET (cont) 
Signal Required 




Switching from the high level (+50 V 
to +10 V; sink less than 40 mA) to the 
low level (+0.5 V to —5 V; sink less 
than 10 mA), in less than 1 ms, resets 
the sweep 


Minimum Pulse Width 




1 0 ms at 50% amplitude points 


Maximum Safe Input 




+ 50 V to -5 V 


A SINGLE SWEEP READY 
(rear panel) 




Bnc connector; remote ready indicator 
for A HORIZ time-base unit 


Output Signal 




Open when not ready; +5 V at 47 fi 
source impedance when ready — 
output will light a No. 49 bulb 


B SINGLE SWEEP READY 
(rear panel) 




Bnc connector; remote ready indicator 
from B HORIZ time-base unit 


Output Signal 




Open when not ready; +5 V at 47 Q 
source impedance when ready — 
output will light a No. 49 bulb 


GRAT/READOUT SINGLE SHOT 
(rear panel) 

Signal Required 




Bnc connector; switching to the low 
level ( + 1 to -5 V; sink less than 
2 mA) from the high level ( + 1 0 V to 
+ 15 V; sink less than 300 mA), in less 
than 1 ms, initiates the Readout 
System to display one complete 
readout frame and the graticule 
illumination to be displayed 
for approximately 0.5 s 


Maximum Open Circuit voltage 




+ 15 V 


Maximum Safe Input Voltage 




+ 15 V, -5 V (dc + peak ac) 



READOUT DISPLAY 



Mode (front panel) 




‘ ' ' 


Free-run (not marked) 


The alphanumeric readout is 
continuously displayed 


Selected by front-panel READOUT 
INTENSITY control 


PULSED 






BEAM, 2 GATED 


The readout display is triggered at the end of 
each sweep of beam 2 




EXTERNAL 


One readout frame is displayed when an 
appropriate remote signal is applied to the 
rear-panel GRAT/READOUT SINGLE SHOT 
connector 





&> 



1-7 




Specification— 7844/R7844 Service 



Table 1-1 (cont) 



Characteristic 


Performance Requirement 


Supplemental Information 


Mode (front panel) (cont) 
MANUAL 


One readout frame is displayed when the 
MANUAL push button is pressed 




Mode (internal switch) 
Free-Run (FR) 


The internal readout mode is dependent on 
the front-panel Readout Mode 




Beam 2 Gated 


The readout display is triggered at the end of 
each sweep of beam 2. The internal Readout 
Mode Switch operates independently of the 
front-panel READOUT controls 




Character Height 




0.25 div to 0.5 div (adjustable) 



POWER SOURCE 



Line Voltage Range (ac, rms) 
switch 




Selected by rear-panel Line Selector 


115 V Nominal 


90 to 132 V 




230 V Nominal 


180 to 264 V 




Line Frequency 




48 to 440 Hz 


Maximum Power Consumption 




235 W, 2.9 A at 60 Hz, 115 V line 



SYSTEM ELECTRICAL SPECIFICATION 

Your TEKTRONIX 7844/R7844 oscilloscope system pro- 
vides exceptional flexibility in operation with a wide choice 
of general and special purpose plug-in units. The type num- 
ber of a particular plug-in unit identifies its usage as follows: 

The first digit (7) denotes the oscilloscope system for 
which the plug-in unit is designed (7000-series). 

The second letter describes the purpose of the plug-in 
unit: 

A — Amplifier unit 
B — “Real time” time-base unit 
C — Curve Tracer 
D — Digital unit 
L — Spectrum Analyzer 



M — Miscellaneous 

S — Sampling unit 

T — Sampling time-base unit 

The third and fourth digits of the plug-in type number 
are sequence numbers and do not carry any special 
connotation. 

An “N” suffix letter added to the normal four-digit type 
number identifies a unit not equipped with the circuitry 
necessary to encode data for the 7000-series readout 
system. 



Table 1 -2 lists the vertical specifications that are system 
dependent. For more complete specifications on plug-in 
units for the 7000-Series Oscilloscope System, refer to the 
Tektronix Products catalog. 








Specification — 7844/R7844 Service 



Table 1-2 

7844/R7844 OSCILLOSCOPE 
SYSTEM VERTICAL SPECIFICATION 











Accuracy* 


Amplifier 








EXT CAL 


INT CAL 


Plug-In 




Bandwidth 


Risetime 


0°C to 50®C 


0°C to 50°C 


Unit 


Probe 


(MHz) 


(ns) 


(%) 


(%) 


7A1 1 


Integral 


200 


1.8 


2 


3 


7A13 


None 


105 


3.5 








P6053B 






1.5 


2.5 




P6055 


65 


5.4 






7A15A 


None 


80 


4.4 


2 


3 




P6053B 


3 


4 


7A16A 


None 


200“ 


2.0 


2 


3 




P6053B 


3 


4 


7A18 


None 


75 


4.7 


2 


3 




P6053B 


3 


4 


7A19 


None 


400“ 


0.9“ 


3 


4 




P6056 


4 


5 




P6057 












P6201 


375“ 


1.0“ 


4 


5 


7A19 (10 mV/Div 


None 






3 


4 


only) 


P6056 


325 


1.1 






P6057 






4 


5 




P6201 


300 


1.2 


4 


5 


7A22 


None or 


1 MHz 


350 


2 


3 




Any 


(within 10%) 


(within 9%) 






7A24 


None 






3 


4 




P6056 


300“ 










1.2“ 


4 


5 




P6057 












P6201 


275“ 


1.3“ 


4 


5 


7A26 


None 


o 

CO 


2.2 


2 


3 




P6053B 


3 


4 


7A29 


P6056 


400“ 

1 




4 


5 




P6057 


0.9“ 







“ Deflection Factor accuracy is checked as follows: 

EXT CAL 0°C to 50 °C — Plug-in gain set at a temperature within 10°C of operating temperature, using an external calibrator with 
accuracy within 0.25%. 

INT CAL 0°C to 50°C— Plug-in gain set using the oscilloscope calibrator (within 10°C of the operating temperature) in a tempera- 
ture range between 0°C and +50 °C. 

“System temperature range from 0°C to +35°C; derate 10% for 0°C to +50°C temperature range. 




Specification — 7844/R7844 Service 



Table 1 -3 lists the horizontal specifications that are sys- 
tem dependent. For more complete specifications on plug-in 
units for the 7000-Series Oscilloscope System, refer to the 
Tektronix Products Catalog. 



Table 1-3 

7844/R7844 OSCILLOSCOPE 
SYSTEM HORIZONTAL SPECIFICATION 



Time 

Base 

Unit 


Performance 

Feature 


Maximum 

Calibrated 

Sweep 

Rate 


Triggering 

Frequency 

Range 


7B80 


E:xt Amplifier 


1 ns/div 


Dc to 400 MHz 


7B85 


Delaying Sweep 


1 ns/div 


Dc to 400 MHz 


7B92A 


Display Switching 


.5 ns/div 


Dc to 500 MHz 



Table 1-4 

SPECIAL PURPOSE AND SAMPLING PLUG-IN UNITS 



Plug-In 


Performance Feature 


7CT1N 


Low-Power Semiconductor Curve Tracer 


7D1 1 


Digital Delay Unit 


7D12 


A/D Converter; plug-in Modules provide 
flexible measurement capability 


7D13 


Measures Temperature, Voltage, Current 
and Resistance 


7K1 1 


CATV Preamplifier 


7L12 


100 kHz to 1.8 GHz Spectrum Analyzer 


7L13 


1 kHz to 1 .8 GHz Spectrum Analyzer 


7M13 


Readout Access Unit 


7S1 1 


Accepts Plug-In Sampling Heads 


7S12 


Time Domain Reflectometer and Sampling 
Applications 


7S14 


Dual-Trace Delayed Sweep Sampler 


7T1 1 


Random or Sequential; Equivalent or 
Real-Time Sampling 



@ 



1-10 




Specification — 7844/R7844 Service 



Table 1-5 
ENVIRONMENTAL 



Characteristic 


Information 


NOTE 

This instrument will meet the electrical characteristics given 
over the following environmental limits. 


1 in the Performance Requirement column of Table 1-1 


Temperature Range 
Operating 


0°C to +50°C 


Non-Operating 


— 55°C to +75°C 


Altitude 

Operating 


15,000 feet 


Non-Operating 


Test limit 50,000 feet 


Electro-magnetic Interference (emi) in accordance with 
MIL-STD-461A as tested in MIL-STD-462 (when equipped with 
Option 03) 

Radiated Interference 


NOTE 

Any unused plug-in compartments must be covered with 
a blank plug-in panel (emi shielded) in order to meet emi 
specifications. See Options section for additional 
information. 

Interference radiated from the instrument under test 
within the given limits from 150 kHz to 100 MHz 


Conducted Interference 


Interference conducted out of the instrument under test 
through the power cord within the given limits from 
150 kHz to 25 MHz 


Transportation (packaged instrument, without plug-ins) 


Qualifies under National Safe Transit Committee test 
procedure 1A, Category 11 



1-11 




Specification — 7844/R7844 Service 



Table 1-6 
PHYSICAL 



Characteristic 


Information 


Ventilation 


Safe operating temperature maintained by dc fan. 
Automatic resetting thermal cutout protects instrument 
from overheating 


Warm-up Time 


20 minutes for rated accuracy 


Finish 


Anodized front panel. 7844-blue vinyl painted aluminum 
cabinet, R7844-lacquered aluminum cabinet 


Overall Dimensions (measured at maximum points) 
Height 


7844 


R7844 


13.6 inch 


7.0 inch 


34.5 cm 


17.8 cm 


Width 


12.0 inch 


19.0 inch 


30.5 cm 


48.3 cm 


Length 


23.8 inch 


22.8 inch 


60.5 cm 


57.9 cm 


Net Weight (Instrument Only) 


36 lbs 


33 lbs 


16.3 kg 


15.0 kg 



NOTE 

See Fig. 1- 1 for 7844 dimensional drawing. Refer to Fig. 1-2 for the R7844 dimensional drawing. 



STANDARD ACCESSORIES 

Standard accessories supplied with the 7844 and R7844 



are given in the Replaceable Mechanical Parts list in this 
manual. For optional accessories available for use with this 
instrument, see the Tektronix Products Catalog. 







Specification — 7844/R7844 Service 




Fig. 1-1. 7844 dimensional drawing. 



1-13 






Specification — 7844/R7844 Service 







Section 2 — 7844/R7844 Service 



OPERATING INFORMATION 



FEATURES 

The TEKTRONIX 7844/R7844 is a solid-state, wide 
bandwidth, dual-beam oscilloscope. The instrument accepts 
TEKTRONIX 7000-Series plug-in units to form a complete 
measurement system. The flexibility of the plug-in feature 
and variety of plug-in units available allow the system to be 
used for many different measurement applications. 



The 7 844/ R 7 844 provides separate vertical and horizon- 
tal deflection systems in addition to FOCUS, INTENSITY, 
and BEAMFINDER functions for each beam. The plug-in 
unit in either vertical compartment can be selected to pro- 
vide vertical deflection for either beam. The plug-in units in 
either horizontal compartment may be selected to provide 
horizontal deflection for either beam. 



The 7844/R7844 features regulated dc power supplies to 
ensure that the performance is not affected by variations in 
line voltage and frequency, or by changes in load due to 
varying power requirements of the plug-in units. The 
7844/R7844 operates from a 115 V or 230 V {50 Hz to 
400 Hz) nominal line source. 



Other features include a dual-gun full-overlap crt with a 
graticule area of 8 x 10 centimeters. The instrument also 
provides a crt display of alphanumeric information encoded 
by the plug-in units. The READOUT display indicates plug-in 
unit status such as deflection factor, sweep rate, and other 
plug-in dependent parameters. 



The Option 21 instrument is basically the same as the 
standard 7844/R7844 except that the vertical deflection 
system is dedicated. The amplifier unit in the LEFT VERT 
compartment controls the vertical deflection of beam 1 and 
the amplilier unit in the RIGHT VERT compartment controls 
the vertical deflection of beam 2. The VERTICAL MODE 
switch and VERT SEP control have been deleted. Refer to 
the Options section for details. 



CONTROLS AND CONNECTORS 

Figures 2-1 and 2-2 show the front and rear panels. A 
brief description of each control and connector is given. Re- 
fer to Detailed Operating Information in the 7844/R7844 Op- 
erators manual for additional operating information. 



Safety Information 

This service manual contains warning and caution infor- 
mation, which the user must follow to ensure safe operation 
of the instrument. Warning information is intended to protect 
the operator and Caution information is intended to protect 
the instrument. 



WARNING 



This instrument is intended to be operated from a sin- 
gle-phase earth-referenced power source having one 
current-carrying conductor (the Neutral Conductor) 
near earth potential. Operation from power sources 
where both current-carrying conductors are live with 
respect to earth (such as phase-to-phase on a three- 
wire system) is not recommended, since only the Line 
Conductor has over-current (fuse) protection within 
the instrument. 

This instrument has a three-wire power cord with a 
three-terminal polarized plug for connection to the 
power source and safety-earth. The safety-earth ter- 
minal of the plug is directly connected to the instru- 
ment frame. For electric-shock protection, insert this 
plug only in a mating outlet with a safety-earth contact 
or otherwise connect the frame to a safety-earth sys- 
tem. The color coding of the cord conductors is in 
accordance with recognized standards. 



Power Cord Conductor Identification 



Conductor 


Color 


Alternate Color 


Ungrounded (Line) 


Brown 


Black 


Grounded (Neutral) 


Blue 


White 


Grounding (Earthing) 


Green- Yellow 


Green-Yellow 



Operating Voltage 

The 7844/R7844 has a VOLTAGE SELECTOR switch 
that allows selection of either a 1 1 5 V or 230 V nominal line 
voltage source. When changing the Voltage Selector switch 
position, disconnect the power cord and use a small 
screwdriver to move the Voltage Selector switch to the de- 
sired range. 



REV JUN 1981 



2-1 






OIOIOTOTOTOTOIOIOIQ. 



jPIOIOI©IQI0IQto^ 








Operating Information — 7844/R7844 Service 




Damage to this instrument may occur if the Voltage 
Selector switch is set to an incorrect position for the 
line voltage applied. 



Voltage Selector 


Regulating 


Sv/itch Position 


Range 


115 V 


90 to 132 volts 


230 V 


180 to 264 volts 



© 

© 

© 

© 

© 

© 

© 

© 

© 



FRONT-PANEL CONTROLS, 
CONNECTORS, AND INDICATORS 

POWER (ON) Switch — Applies power to instrument. 



POWER Indicator — Lights when power is on. 



BEAM 2 INTENSITY Control — Controls brightness of 
beam 2 display. 



BEAM 2 FOCUS Control — Provides optimum defini- 
tion of beam 2 display. 



BEAM 1 INTENSITY Control — Controls brightness of 
beam 1 display. 



BEAM 1 FOCUS Control — Provides optimum defini- 
tion of beam 1 display. 



CALIBRATOR Connector — Provides 1 kHz calibrated 
square-wave voltages. 



TRACE ROTATION Adjustment — Aligns beam 1 and 
beam 2 traces with the graticule lines. 



GRAT ILLUM Control — Varies level of graticule illumi- 
nation or activates PULSED GRAT ILLUM functions. 



(ijj) GRAT ILLUM PRESET Adjustment (PULSED oper- 
ation only)— Sets level of illumination for GRAT 
ILLUM PULSED operation. 



@ GRAT ILLUM EXT/BEAM 2 GATED Control 
(PULSED operation only) — When in EXT (push button 
IN) a signal to the rear-panel GRAT/READOUT SIN- 
GLE SHOT connector provides momentary graticule 
illumination. When in BEAM 2 GATED (push button 
OUT) momentary graticule illumination is provided at 
the end of beam 2 sweep. 

@ GRAT ILLUM MANUAL Control (PULSED operation 
only)— Provides momentary graticule illumination 
when push button is pressed. 

(j?) READOUT MANUAL Control 1 (PULSED OjDeration 
only) — One readout frame is displayed when push 
button is pressed. 

(U) READOUT EXT/BEAM 2 GATED 1 (PULSED oper- 
ation only) Control— When in EXT (push button IN), a 
signal to the rear-panel GRAT/READOUT SINGLE 
SHOT connector provides one readout frame. When 
in BEAM 2 GATED (push button OUT) one readout 
frame is displayed at the end of beam 2 sweep. 

^ 5 ) READOUT PRESET Adjustment (PULSED operation 
only) — Sets PULSED readout intensity. 

(?6) READOUT INTENSITY Control 1 — Activates and con- 
trols brightness of the alphanumeric display or acti- 
vates the PULSED readout functions. 



(17) Ground Connector (not marked) — Binding post to es- 
tablish common ground between associated 
equipment. 

(Ml) Current Loop (not marked) 

7844 — Provides 40 mA square-wave current (1 kHz) 
when the CALIBRATOR switch is set to 40 mA 
position. 



R7844 — Provides 40 mA square-wave current (1 kHz) 
when optional current loop adapter is connected to 
the CALIBRATOR connector and the CALIBRATOR 
switch is set to 4 V position. 

(li) HORIZ SEP (1) Control — Horizontally positions beam 
1 display. 



1 Refer to Instrument Options section for instruments equipped 
with the Writing Speed Enhancer (Option 22). 



REV JUN 1981 



2-3 




Operating Information — 7844/R7844 Service 



( 20 ) ENHANCER PRESET Adjustment 1 (Option 22 only; 
not shown). 



( 21 ) B TRIG SOURCE Control— Selects LEFT VERT or 
RIGHT VERT compartment as the source of internal 
trigger signal for B HORIZ compartment. 



(22) BEAM 2 HORIZONTAL MODE Control— A HORIZ or 
B HORIZ compartments can be selected to control 
beam 2. 



( 23 ) A TRIG SOURCE Control— Select LEFT VERT or 
RIGHT VERT compartment as the source of internal 
trigger signal for the A HORIZ compartment. 



(24) BEAM 2 BEAMFINDER (LOCKS IN) Control- 
Intensities and locates beam 2 display. 



(25) VERT SEP (1) Control (deleted with Option 21) — Pro- 
vides positioning of beam 1 when both beam 1 and 
beam 2 are being controlled by the same vertical 
compartment. 



(26) BEAM 2 VERTICAL MODE Control (deleted with Op- 
tion 21 ) — Allows beam 2 to be controlled by either the 
LEFT VERT or RIGHT VERT compartments. 

(2?) BEAM 1 VERTICAL MODE Control (deleted with Op- 
tion 21) — Allows beam 1 to be controlled by either the 
LEFT VERT or RIGHT VERT compartments. 



(2?) PROBE POWER Connectors (two) — Provide power 
for active probe systems (located on rear panel of 
7844 ). 

(29) BEAM 1 BEAMFINDER (LOCKS IN) Control— 
Intensifies and locates beam 1 display. 

(30) BEAM 1 HORIZONTAL MODE Control— A HORIZ or 
B HORIZ compartments can be selected to control 
beam 1 . 



( 3 T) Camera Power Connector (not marked) — Three-pin 
connector provides power for camera operation and 
receives single-sweep reset signal. 



1 Refer to instrument Options section for instruments equipped 
with the Writing Speed Enhancer (Option 22). 



REAR-PANEL CONTROLS AND 
CONNECTORS 

Q MAIN and DLY’D (A GATE) Switch — Selects between 
main and delay gates from time base unit in A HORIZ 
compartment. 

0 SINGLE SWEEP (A READY) Connector— Output for 
single-sweep ready signal from time-base unit in A 
HORIZ compartment. 



3J Z AXIS INPUT 1 Connector — Input for intensity mod- 
ulation of BEAM 1 . 



0 GRAT/READOUT SINGLE SHOT Connector— Input 
for single shot graticule illumination and single frame 
readout. 




Z AXIS INPUT 2 Connector — Input for intensity mod- 
ulation of BEAM 2. 



(V) SINGLE SWEEP RESET Connector — Input to exter- 
nally reset single-sweep circuits in A HORIZ and B 
HORIZ comparments. 

0 SINGLE SWEEP (B READY) Connector— Output for 
single-sweep ready signal from time-base unit in B 
HORIZ compartment. 

© A GATE Connector — Positive-going output for gate 
signal from the time-base unit in the A HORIz 
compartment. 

( T ) MAIN and DLY’D (B GATE) Switch — Selects between 
main and delay gates from time base unit in B HORIZ 
compartment. 

@ B GATE Connector — Positive-going output for gate 
signal from the time-base unit in the B HORIZ 
compartment. 

(7T) B SAWTOOTH Connector — Positive-going sawtooth 
from B time base. 



0 A SAWTOOTH Connector— 
from A time base. 



Positive-going sawtooth 



2-4 



REV JUN 1981 




Operating Information -7844/R7844 Service 



(U) CONTROL ILLUMINATION Switch-Sets illumination 
level of push-button switches on plug-in units (located 
on left side panel of R7844). 

(IT) PROBE POWER Connectors (two)— Provide power 
for active probe systems (located on front panel of 
R7844). 

(l?) Voltage Selector Switch (not labeled) -Selects from 
either 115-volt or 230 volt nominal line source. 

(Nj) Line Fuse -4 A FAST BLOW. 

Operating Temperature 

The 7844/R7844 can be operated where the ambient air 
temperature is between 0° C and +50° C. After storage at 
temperatures beyond the operating limits, allow the chassis 
temperature to come within the operating limits before 
power is applied. 

The 7844 is cooled by air drawn in through holes in the 
side and bottom panels and blown out through the fan 
exhaust. To ensure proper cooling of the 7844, maintain the 
clearance provided by the feet on the bottom and allow 2 
inches clearance on the top, sides, and rear (more clear- 
ance, if possible). The R7844 is cooled by air drawn in 
through the air filter on the rear panel and blown out through 
holes located on the side panels. To ensure proper cooling 
of the R7844, refer to the dimensional drawing in Section 1 
of this manual (Fig. 1-2). 

A thermal cutout disconnects power from this instrument 
if the internal temperature exceeds a safe operating level. 
Power is automatically restored when the temperature 
returns to a safe level. 

Rackmounting 

Instructions and dimensional drawings for rackmounting 
the R7844 are given in the Operators Manual. 



WARNING 

During rackmount installation, interchanging the left 
and right slide-out track assemblies defeats the exten- 
sion stop (safety latch) feature of the tracks. Equip- 
ment could, when extended, come out of the slides 
and fall from the rack, possibly causing personal injury 
and equipment damage. 

When mounting the supplied slide-out tracks, in- 
spect both assemblies to find the LH (left hand) and 
RH (right hand) designations to determine correct 
placement. Install the LH assembly to your left side as 
you face the front of the rack and install the RH as- 
sembly to your right side. Refer to the rackmounting 
instructions in this manual for complete information. 



Operating Position 

A bail-type stand is mounted on the bottom of the 7844. 
This stand permits the instrument to be tilted up approxi- 
mately 10° for more convenient crt viewing. 

PLUG-IN UNITS 

The 7844/R7844 accepts up to four TEKTRONIX 7000- 
Series plug-in units. This feature allows selection of 
bandwidth* sensitivity, display mode, etc., and provides for 
future expansion of the system. 

The overall capabilities of the system are determined 
mainly by the characteristics of the plug-ins selected. Some 
typical combinations are given under Applications in the 
7844/R7844 Operator’s manual. For information on other 
plug-in units, refer to the current Tektronix catalog. 

Installation of Plug-In Units 

Plug-in units cannot be installed or removed without turn- 
ing the instrument power off. To install a plug-in unit into a 
compartment, align the slots in the top and bottom of the 
plug-in unit with the associated guide rails in the plug-in 
compartment. Insert the plug-in unit into the compartment 
until it locks into place. To remove a plug-in unit, pull the 
release latch on the plug-in unit to disengage it. To meet emi 
specifications of instruments equipped with Option 03, all 
unused plug-in compartments should be covered with an 
emi-shielded, blank plug-in panel, Tektronix Part No. 016- 
0155-00. 

The 7844/R7844 calibration procedure given in this man- 
ual normalizes the vertical and horizontal gains. This allows 
plug-in units to be interchanged between plug-in compart- 
ments without recalibration. The basic calibration of the 
plug-in units should be checked when installed to verify their 
accuracy (refer to plug-in operating instructions). 

REPACKAGING FOR SHIPMENT 

If the Tektronix instrument is to be shipped to a 
Tektronix Service Center for service or repair, attach a tag 
showing: owner (with address) and the name of an individ- 
ual at your firm that can be contacted. Include complete 
instrument serial number and a description of the service 
required. 

Save and re-use the package in which your instrument 
was shipped. If the original packaging is unfit for use or not 
available, repackage the instrument as follows: 

Surround the instrument with polyethylene sheeting to 
protect the finish of the instrument. Obtain a carton of 
corrugated cardboard of the correct carton strength and 
having inside dimensions of no less than six inches more 
than the instrument dimensions. Cushion the instrument 
by tightly packing three inches of dunnage or urethane 
foam between carton and instrument, on all sides. Seal 
carton with shipping tape or industrial stapler. 

The carton test strength for your instrument is 375 
pounds. 



2-6 



REV OCT 1981 




Section 3 — 7844/R7844 Service 



THEORY OF OPERATION 

INTRODUCTION 



This section of the manual decribes the circuitry used in the 7844/R7844 Oscilloscope. The description begins with a 
discussion of the instrument, using the block diagram shown in the Diagrams section at the back of this manual. Next, each 
circuit is described in detail with supporting illustrations, when appropriate, to show the relationship between the stages in 
each major circuit. Detailed schematics of each circuit are located in the Diagrams section. Refer to these schematics through- 
out the following circuit description for specific electrical values and relationships. 



BLOCK DIAGRAM 

The following discussion is provided to aid in understand- 
ing the overall concept of the 7844/R7844 before the individ- 
ual circuits are discussed in detail. A basic block diagram of 
the 7844/R7844 is shown in the Diagrams section. Only the 
basic interconnections between the individual blocks are 
shown on this diagram. Numbers on blocks refer to major 
circuits within the instrument. The number on each block 
refers to the complete circuit diagram located at the rear of 
the manual. 



Description 

Vertical signals to be displayed on the cathode ray tube 
(crt) are applied to the Vertical Interface circuits from both 
vertical plug-in compartments. The VERTICAL MODE 
switch determines whether the signals from the LEFT VERT 
or RIGHT VERT compartments are displayed by beam 1 or 
beam 2. The selected vertical signals are amplified by the 
Vertical Amplifier circuits to bring them to the level neces- 
sary to drive the vertical deflection plates of the crt. The 
Beam 2 Vertical Amplifier circuit also includes an input from 
the Readout System to produce the vertical portion of the 
alphanumeric readout display. 



Horizontal signals for display on the crt are connected to 
the Horizontal Interface circuits from both horizontal plug-in 
compartments. The HORIZONTAL MODE switch deter- 
mines whether the signals from the A HORIZ or B HORIZ 
units are displayed by beam 1 or beam 2. The selected hori- 
zontal signals are amplified by the Horizontal Amplifier cir- 
cuits to provide horizontal deflection for the crt. The Beam 2 
Horizontal Amplifier circuit also accepts an input signal from 
the Readout System to produce the horizontal portion of the 
alphanumeric readout display. 



The Readout System provides alphanumeric display of 
information encoded by the plug-in units. The readout dis- 
play is written on the crt by beam 2 on a time-shared basis 



with the analog waveform display. The MODE switch cir- 
cuits determine which plug-in units display readout informa- 
tion. The Readout and Grat Ilium Control circuits contain the 
controls necessary for the operation of the pulsed readout 
and pulsed graticule illumination functions. 



The internal trigger signals from the vertical plug-in units 
are connected to the Trigger Selector circuits. The Mode 
Switch and Trigger Selector circuits direct trigger signals 
from the LEFT VERT or RIGHT VERT units to the A HORIZ 
or B HORIZ units. 



The Logic circuit develops control signals for use in other 
circuits within this instrument and the plug-in units. These 
control signals automatically determine the correct instru- 
ment operation in relation to the plug-in units, plug-in unit 
control settings, and 7844/R7844 control settings. 



The CRT circuit contains the control circuits necessary 
for operation of the crt. The Z-Axis Amplifiers for beams 1 
and 2 provide the drive signal to control the intensity level of 
the crt display. 



The Calibrator circuit produces a 1 kHz square-wave sig- 
nal that can be used to check the calibration of this instru- 
ment and the compensation of probes. The calibrator signal 
is available as a voltage at the CALIBRATOR connector or 
as a current through the 40 mA current loop (optional cur- 
rent loop adapter necessary for the R7844). 



The Signals-Out circuits process signals from the plug-in 
units for rear-panel output. Input signals are coupled to the 
Signals-Out circuits for use by the 7844/R7844 or the plug- 
in units. 



The Converter/Rectifiers and Low-Voltage Regulator cir- 
cuits provide the power necessary to operate this instru- 



REV JUN 1981 



3-1 




Theory of Operation — 7844/R7844 Service 

ment. These voltages are connected to all circuits within the 
instrument. The High-Voltage Power Supply provides accel- 
erating potential for the crt. 

DETAILED CIRCUIT OPERATION 

This section provides a description of the electrical oper- 
ation and relationships of the circuits in the 7844/R7844. 
Circuits commonly used in the electronics industry are not 
described in detail. If more information is desired on these 
commonly used circuits, refer to the following textbooks: 

Gordon V. Deboo, Integrated Circuits and Semiconductor 
Devices , McGraw-Hill, New York, 1971. 



Jacob Millman and Herbert Taub, Pulse Digital and Switch- 
ing Waveforms, McGraw-Hill, New York, 1965. 



All logic functions are described using the positive logic 
convention. Positive logic is a system of notation where the 
more positive of two levels (HI) is called the true or 1 -state; 
the more negative level (LO) is called the false or 0-state. 
The HI-LO method of notation is used in this logic descrip- 
tion. The specific voltages that constitute a HI or LO state 
vary between individual devices. Wherever possible, the in- 
put and output lines are named to indicate the function that 
they perform when at the HI (true) state. 



Non-Digital Devices 

Not all of the integrated circuit devices in this instrument 
are digital logic devices. The function of non-digital devices 
is described individually, using operating waveforms or oth- 
er techniques to illustrate their function. 



Calibrator and Pulsed Switching 

The Calibrator circuit provides a 40 mA current output at 
the front-panel 40 mA current loop (optional current loop 
adapter required for R7844, 40 mA output) and voltage out- 
puts in calibrated steps from 4 mV to 4 V at the Calibrator 
output connector. Readout and graticule illumination control 
circuits are also shown on diagram 1 . However, the readout 
control circuitry is discussed in conjunction with the 
Readout System; see the Readout Control discussion in 
this section (diagrams 1 and 17). 

Thomas C. Bartee, Digital Computer Fundamentals, 

McGraw-Hill, New York, 1966. _ ... . 

Calibrator 

Transistors Q902 and Q908 compose a 1 kHz, square- 
wave oscillator. Oscillation occurs as follows: when Q902 is 
conducting, Q908 is off. The current through Q902 holds the 
base of Q908 low while the collector is positive, which pro- 
duces the positive portion of the square wave. At the same 
time, C902 begins to charge toward -50 V through R909. 
The emitter of Q908 starts to go negative as C902 charges 
toward —50 V. When the emitter of Q908 reaches approxi- 



Yaohan Chu, Digital Computer Design Fundamentals, 
McGraw-Hill, New York, 1962. 



Joseph Millman and Herbert Taub, Pulse, Digital, and 
Switching Waveforms, McGraw-Hill, New York, Chapters 
9—11, 1965. 




Albert Paul Malvino, Transistor Circuit Approximations, 
McGraw-Hill, New York, 1973. 



The following circuit analysis is written with supporting 
illustrations that give the names of the individual stages 
within major circuits and show how they are connected to- 
gether to form the major circuit. These illustrations also 
show the inputs and outputs for each circuit and the rela- 
tionship of the front-panel controls to the individual stages. 
The detailed circuit diagrams from which the illustrations are 
derived are shown in the Diagrams section. 

Logic Fundamentals 

Digital logic techniques are used to perform many func- 
tions within this instrument. The function and operation of 
the logic circuits are described using logic symbology and 
terminology. This portion of the manual is provided to aid in 
the understanding of these symbols and logic concepts, not 
a comprehensive discussion of the subject. For further infor- 
mation on binary number systems and the associated Bool- 
ean algebra concepts, the derivation of logic functions, or a 
more detailed analysis of digital logic, refer to the following 
textbooks: 

Robert C. Baron and Albert T. Piccirilli, Digital Logic and 
Computer Operation, McGraw-Hill, New York, 1967. 



Symbols 

The operation of circuits in this instrument that use digital 
techniques is described using the graphic symbols set forth 
in military standard MIL-STD-806B. Any deviations from the 
standard symbology, or devices not defined by the standard 
are described in the circuit description for the applicable 
device. 



NOTE 

Logic symbols used on the diagrams depict the logic 
function as used in this instrument and may differ from 
the manufacturer's data. 



Logic Polarity 



3-2 



REV JUN 1981 




Theory of Operation — 7844/R7844 Service 



mately 0.6 V more negative than the level at its base, Q908 
becomes forward biased and its emitter rapidly rises posi- 
tive. Since C902 cannot change its charge instantaneously, 
the sudden change in voltage at the emitter of Q908 reverse 
biases Q902 by pulling its emitter positive. The current 
through Q908 produces a voltage drop at its collector to 
produce the negative portion of the square wave. 



When Q902 is off, Q908 is conducting. Since Q902 is 
reverse biased, C902 can begin to discharge through R902, 
The emitter level of Q902 follows the discharge of C902 until 
it reaches approximately —15.6 V. Then Q902 becomes for- 
ward biased and its collector drops negative. Consequently, 
Q908 is reverse biased, which interrupts the current through 
Q908 and its collector goes positive again to complete the 
square wave. Again, C902 begins to charge through R902 
to start the second cycle. The signal produced at the collec- 
tor of Q908 is a 1 kHz square wave. The 1 kHz adjustment, 
R904, sets the calibrator for a 1 kHz square-wave output. 



Transistor Q910 is switched on and off by the square- 
wave signal produced at the collector of Q908. When Q91 0 
is on, current flows through R912, R913, and Q910 to 
ground. When Q910 is off, current flows into the voltage 
divider network R918, R920, R924, R928, R926, and R930 
to provide the 4 V, 0.4 V, 40 mV and 4 mV Calibrator output 
voltages (into a high-impedance load). The 0.4 V adjust- 
ment, R915, is set in the 0.4 V position of the CALIBRATOR 
switch to provide accurate calibrator output voltages at the 
output connector, J995. With R915 accurately set, 8 mA 
flows through R918 and the current loop when the CALI- 
BRATOR switch is in the 40 mA position. The current loop 
is a five-turn current transformer, so the effective current 
applied to a current probe is 40 mA. The R7844 requires an 
optional current loop adapter and the CALIBRATOR switch 
(S920) must be set to the 4 V position for a 40 mA Calibra- 
tor output. 



Crossover Mode Switch 

The Crossover Mode Switch circuit includes front-panel 
switching and provides the logic for selection of the vertical 
and horizontal compartments that control the deflection of 
beam 1 and beam 2. The Crossover Mode Switch circuits 
operate in conjunction with the Logic circuits (diagram 5) to 
develop control signals for use in other circuits within this 
instrument and plug-in units installed. Figure 3-1 shows a 
detailed block diagram of the Crossover Mode Switch. A 
schematic of this circuit is shown on diagram 2 at the rear of 
this manual. 




Vertical Mode Switching and Vertical Mainframe Mode 

The Vertical Mode Switching stage, consisting primarily 
of S3153 and S3155, determines whether the plug-in units 
in the LEFT VERT or RIGHT VERT compartments are to be 
displayed by beam 1 or beam 2. The VERTICAL MODE 
switches provide a HI level at P3163 pins 4 and 5 for display 
of the Right Vertical unit and a LO level for the display of the 
Left Vertical unit. Pin 5 of P3163 provides beam 1 informa- 
tion and P3163 pin 4 provides beam 2 information. The ver- 
tical mode signals (P3163 pins 4 and 5) are coupled to the 
Crossover Vertical Interface circuits (diagram 7). 



The Vertical Mode switch outputs are also coupled to the 
Vertical Mainframe Mode stage. A HI level at CR3176 or 
CR3177 anodes provides a HI level at P3134 pin 5, indicat- 
ing that the Left Vertical unit is being displayed. A HI level at 
CR3178 or CR3179 anodes provides a HI level a P3134 pin 
4 indicating that the Right Vertical unit is being displayed. 
Pins 4 and 5 of P3134 are coupled to the Main Interface 
circuits (diagram 4). This information is used by the vertical 
plug-in units when auxiliary Z-axis is being used to ensure 
that only the displayed plug-in unit is modifying the Z-axis 
signal. 



Graticule Illumination 

Resistor R960 (GRAT ILLUM) determines the brightness 
of the graticule lights (except when in the PULSED position) 
by controlling the output of the graticule light supply. R958 
(GRAT ILLUM PRESET) determines the brightness of the 
graticule lights when the GRAT ILLUM control is set to 
PULSED. In the PULSED mode, the graticule lights are gat- 
ed on for approximately 0.5 second. A programmable 
unijunction transistor (Q944), in conjunction with Q954 gen- 
erates the pulse that turns the graticule lights on. A negative 
signal (from the MANUAL push button, the Beam 2 Gate, or 
from an external input) will cause Q944 to conduct and start 
discharging C954. At this time, Q954 turns off, which allows 
R958 to control the output of the graticule light supply. Ca- 
pacitor C954 discharges until Q944 cannot maintain con- 
duction and finally turns off. Then, C954 begins to charge 
positive until the zener voltage of CR957 is reached, which 
turns on Q954 and its collector goes negative to turn the 
graticule light supply off. 



The Vertical Mode Switching signals are also used in the 
following stages within the Crossover Mode Switch circuits: 
Plug-in Alternate Switching Logic, Chop Blanking Control, 
Vert Sep (1) Control, and Readout Display Logic. Refer to 
the block diagram in Fig. 3-1 . 



Horizontal Mode Switching 

The Horizontal Mode Switching circuits, consisting pri- 
marily of S3157 and S3159, determine whether beam 1 or 
beam 2 is to be displayed by the plug-in unit in the A HORIZ 
or B HORIZ compartments. A LO level at P3134 pins 7, 8, 9, 
or 10 indicates the selected mode. Only two pins will be LO 
at a time. The outputs (P3134 pins 7, 8, 9, and 10) are used 
in the Horizontal Interface circuits (diagram 11), Z-Axis Log- 
ic circuits (diagram 5), Auxiliary Z-Axis Logic circuits (dia- 
gram 5), and Auxiliary Y-Axis Switching circuits (diagram 4). 



REV JUN 1981 



3-3 




Theory of Operation — 7844/R7844 Service 



S3161 

ATRIG 

SOURCE 

S3 163 
B TRIG 
SOURCE 



TO TRIGGER 
SELECTOR 



R3189 
fhlORIZ , 



VERT SEP {1) 
CONTROL 
U3177 
Q3180 
Q3182 



TO BEAM 1 . 

HORIZONTAL 02 } 
AMPLIFIER 

VERTSEPTO BEAM 1 
VERTICAL AMPLIFIER 



ER <£><$> 



LEFT VERT 
J1 



RIGHT VERT 
J2 



S3153 
(BEAM 1) 



S3155 
(BEAM 2) 



S3157 
(BEAM 1) 



S3159 
(BEAM 2) 



VERTICAL 


VERTICAL 


HORIZONTAL 


HORIZONTAL 


MODE 

l 


MODE 


MODE 


MODE 




VERTICAL 

MODE 

SWITCHING 




PLUG-IN 

MODE 



PLUG-IN 

ALTERNATE 

SWITCHING 

LOGIC 

U4153 U3163 

U3155 U3165 

U3157 U3169 

U3159 U3171 

U3161 U3173 



HORIZONTAL 

MODE 

SWITCHING 



BEAM 1 AND 2 (A OR B) 



VERTICAL 

MAINFRAME 

MODE 

CR3176 

CR3177 

CR3178 

CR3179 




LEFT OR RIGHT 



END AB 

CONTROL +END AB 



„ U3167 B, C 

LEFT VERT AB OR END AB 

RIGHT VERT AB OR END AB 



CROSSOVER 

VERTICAL 

INTERFACE 



PLUG-IN' 

MODE 



PLUG-IN 

MODE 

SENSE 

U3154 

U3164 

Q3158 

Q3162 

Q3170 

03174 



CHOP 

BLANKING 

CONTROL 



READOUT 

DISPLAY 

LOGIC 

U3191 



READOUT 

SYSTEM 



AUX Z— AXIS < 



fBEAMFINDER | 

S3167 
BEAM 2 

pteAMFIfiPER I 
R3193 

["intensity | 

R3194 

[ intensity | 

R3195 
I FOCUS I 



TO BEAM 1 VERTICAL AND HORIZONTAL AMPLIFIERS 
AUX Z-AXIS <e> 

TO BEAM 2 VERTICAL AND HORIZONTAL AMPLIFIERS 



TO BEAM 1 
Z-AXIS LOGIC 



TO BEAM 2 
Z-AXIS LOGIC 



TO CRT 
CIRCUIT 



n 



INDICATES CIRCUITS 
NOT ON MODE 
SWITCH DIAGRAM 




3-4 



REV JUN 1981 








Theory of Operation — 7844/R7844 Service 



VERT SEP (1) Control 

The front-panel VERT SEP (1) control provides vertical 
positioning of the beam 1 trace when one vertical plug-in 
compartment is selected for display of both beams. 



The negative-input gate U3177D determines if the LEFT 
VERT compartment is selected for display of both beams 
and negative input gate U3177B determines if the RIGHT 
VERTICAL unit is selected for deflection of both beams. 



When neither plug-in unit is selected for vertical deflec- 
tion of both beams, the output of gate U3177A is HI. The HI 
level is coupled through emitter follower Q3180 to turn off 
Q3182, thereby blocking current to the Auxiliary Y-Axis in- 
put on the Beam 1 Vertical Amplifier (diagram 9). 



However, when a plug-in compartment is selected for 
vertical deflection of both beams, the inputs of either the left 
vertical gate (U3177D) or the right vertical gate (U3177B) 
are both LO, which sets the output of U3177A LO. The 
emitter of Q3180 follows its base (LO), which turns on 
Q3182. VERT SEP (1) control R3185 varies the current 
drive (Auxiliary Y-Axis) to the Beam 1 Vertical Amplifier (dia- 
gram 9). 



Plug-In Alternate Switching Logic 

The Plug-In Alternate Switching Logic stage produces 
control signals to the Logic circuits (diagram 5) for operation 
of a dual-trace amplifier unit in the alternate mode. A dual- 
trace amplifier unit, operating in the alternate mode, switch- 
es between display of channel 1 and channel 2 signals at the 
end of each sweep. The Plug-In Alternate Switching Logic 
stage determines whether the amplifier unit in the LEFT 
VERT or RIGHT VERT compartments is alternated by the 
time-base units in the A HORIZ or B HORIZ compartments. 



The Plug-In Alternate Switching Logic stage is controlled 
by the Vertical Mode Switching and Horizontal Mode 
Switching stages (refer to the block diagram in Fig. 3-1). 
Figure 3-2 shows input/output conditions for all combina- 
tions Of the VERTICAL MODE and HORIZONTAL MODE 
switches. A HI level at P3129 pins 3, 4, 5, 6, 7, 8, or 9 is an 
enable command to the Left Vertical Alternate Switching, 
Right Vertical Alternate Switching, or End of AB Alternate 
Logic stages on the Logic circuit (diagram 5). Refer to the 
Diagrams section for a block diagram of the Logic circuit. 



End AB Control 

When one amplifier unit (set for alternate operation) is 
selected for the vertical deflection of both beams and differ- 
ent time-base units are selected for the horizontal deflection 
of beam 1 and beam 2, the instrument is operating in the 



End of AB Mode. The End of AB Control stage detects End 
of AB operation. A complete discussion of End of AB Logic 
will be given in the description of the Logic circuits (diagram 
5). 



The End AB Control circuit (U3167C, B) is gated from the 
Alternate Switching Logic stage. A HI level at the End AB 
Right output (P3129 pin 3) or a HI level at the End AB Left 
line (pin 6) enables the End AB Control circuit for a HI level 
at the End AB line (pin 9), providing the amplifier unit select- 
ed is set to the alternate mode. Refer to the Plug-In Mode 
Sense discussion for further information. Figure 3-2 shows 
input/output conditions for all combinations of the VERTI- 
CAL MODE and HORIZONTAL MODE switches that 
produce the End of AB outputs. 



The End of AB signals are coupled to the following Logic 
circuit stages (diagram 5): End of AB Logic, Left Vertical 
Alternate Switching, and Right Vertical Alternate Switching. 
Refer to the Diagrams section for a block diagram of the 
Logic circuit. 



Plug-In Mode Sense 

The Plug-In Mode Sense circuits determine whether the 
amplifier units installed in the vertical compartments are op- 
erating in the alternate or chop modes. 



Alternate Mode Sense. Integrated circuit U3154 and 
transistor Q31 58 sense alternate operation from the LEFT 
VERT compartment and U3164 and Q3170 sense alternate 
operation from the RIGHT VERT compartment. Operation 
of the left and right sense circuits is identical. Therefore, 
only the left alternate sensing circuit will be described. 



Assume that the VERTICAL MODE and HORIZONTAL 
MODE switches are selected for a HI level at End AB Left 
output (P31 29 pin 6). Refer to Fig. 3-2. If the plug-in unit is in 
the alternate mode, the approximate 1 V level at pins 3 and 
6 of U31 54 does not provide sufficient output for Q31 58 to 
conduct. Therefore, the collector voltage of Q3158 rises to 
approximately 5 V, which allows the End AB Left output to 
remain HI. If the plug-in unit dictates any plug-in mode ex- 
cept alternate, the signal to pins 3 and 6 of U3154 provides 
sufficient output for Q3158 to conduct to saturation, thereby 
dropping the collector voltage to approximately zero. The 
LO level at the collector of Q3158 pulls the End AB Left 
output LO (P3129 pin 6) setting the End AB output LO (pin 
9) by way of gates U3167C and B. 



Chop Mode Sense. Integrated circuit U3154 and transis- 
tor Q3162 sense chop operation from the LEFT VERT com- 
partment and U3164 and Q3174 sense chop operation from 
the RIGHT VERT compartment. Operation of the left and 



REV JUN 1981 



3-5 




Theory of Operation — 7844/R7844 Service 



OUTPUT AT P3129 




LEFT 


LEFT 


n 


A 


LO 


LO 


HI 


LO 


LO 


LO 


LO 


LEFT 


LEFT 


A 


B 


HI 


LO 


LO 


HI 


LO 


LO 


LO 


LEFT 


LEFT 


B 


A 


HI 


LO 


LO 


HI 


LO 


LO 


LO 


LEFT 


LEFT 


B 


B 


LO 


HI 


LO 


LO 


LO 


LO 


LO 


LEFT 


RIGHT 


A 


m 


LO 


LO 


HI 


LO 


LO 


HI 


LO 


LEFT 


RIGHT 


A 


MM 


LO 


LO 


HI 


LO 


HI 


LO 


LO 


LEFT 


RIGHT 


B 


A 


LO 


HI 


LO 


LO 


LO 


HI 


LO 


LEFT 


RIGHT 


B 


B 


LO 


HI 


LO 


LO 


HI 


LO 


LO 


RIGHT 


LEFT 


A 


A 


LO 


LO 


HI 


LO 


LO 


HI 


LO 


RIGHT 


LEFT 


A 


B 


LO 


HI 


LO 


LO 


LO 


HI 


LO 


RIGHT 


LEFT 


B 


A 


LO 


LO 


HI 


LO 


HI 


LO 


LO 


RIGHT 


LEFT 


B 


wm 


LO 


HI 


LO 


LO 


HI 


LO 


LO 


RIGHT 


RIGHT 


A 


A 


LO 


LO 


LO 


LO 


LO 


HI 


LO 


RIGHT 


RIGHT 


wa 


B 


HI 


LO 


LO 


LO 


LO 


LO 


HI 


RIGHT 


RIGHT 


B 


A 


HI 


LO 


LO 


LO 


LO 


LO 


HI 


RIGHT 


RIGHT 


B 


B 


LO 


LO 


LO 


LO 


HI 


LO 


LO 



Output can be HI only when the plug-in unit selected is set to the Alternate Mode 



1676-78 



Fig. 3-2. Input/Output conditions for plug-in unit alternate switching. 



right chop sense circuits is identical. Therefore, only the left 
chop sensing circuit will be described. 



If the selected plug-in unit is in the chop mode, the ap- 
proximate zero volt level at pins 3 and 6 of U3154 is suffi- 
cient for Q3162 to conduct into saturation. The collector of 
Q3162 drops to approximately zero volt providing a LO level 
to the Chop Blanking Control circuit (see Fig. 3-2). When the 
plug-in unit is operating in any mode except chop, U31 54 
will not turn on Q3162 and its collector will rise to +5 V (HI). 



Chop Blanking Control 

The Chop Blanking Control circuits produce control sig- 
nals to the logic circuits (diagram 5) for operation of dual- 
trace amplifier units in the chop mode. The Chop Blanking 
Control circuits determine if chop blanking pulses are re- 
quired for beam 1 or beam 2 displays. Integrated circuits 
U3167A, U3175A, and U3177C comprise the Beam 2 Chop 
Blanking Control circuit and U3175C, U3175B, and U3175D 



comprise the Beam 1 Chop Blanking Control circuit. Oper- 
ation of the beam 1 and beam 2 control circuits is identical. 
Therefore, only the beam 2 control circuit will be described. 



Assume that the amplifier unit in the LEFT VERT com- 
partment is selected to display beam 2. Pin 3 of negative 
input gate U3167A is set LO. Providing that the plug-in unit 
is selected for chop operation, pin 2 of U3167A is set LO by 
the Plug-In Mode Sense stage. Therefore, a HI level is coup- 
led to gate U3175A to provide the LO output needed for 
beam 2 chop blanking. 



If the amplifier unit in the RIGHT VERT compartment is 
selected to display beam 2, pin 9 of negative-input gate 
U3177C is set LO. Providing that the RIGHT VERT plug-in 
unit is selected for chop operation, pin 8 of U3177C is set 
LO by the Plug-In Mode Sense stage. Therefore, a HI level 
is coupled to gate U3175A to provide the LO level needed 
for beam 2 chop blanking. 



3-6 



REV JUN 1981 



































































































































































Theory of Operation — 7844/R7844 Service 



Readout Display Logic 

The Readout Display Logic stage produces vertical and 
horizontal lockout pulses (positive-going) to the Readout 
System (diagram 17). The lockout pulses inhibit the readout 
display of the appropriate plug-in unit. Four negative-input 
AND gates (U3191A, B, C, D) provide lockout pulses for the 
RIGHT VERT, LEFT VERT, B HORIZ, and A HORIZ com- 
partments, respectively. Figure 3-3 provides input/output 
conditions for the various lockout outputs. 




Fig. 3-3. Input/output conditions for Readout Display Logic 
stage. 



Dedicated Mode Switch (Option 21 Only) 

The Dedicated Mode Switch circuit includes front-panel 
switching and provides the logic for selection of the horizon- 
tal compartments that control the horizontal deflection of 
beam 1 and beam 2. The LEFT VERT compartment is dedi- 
cated to the vertical deflection of beam 1 and the RIGHT 




VERT compartment is dedicated to the vertical deflection of 
beam 2. The Dedicated Mode Switch circuits operate in con- 
junction with the Logic circuits (diagram 5) to develop con- 
trol signals for use in other circuits within this instrument 
and the plug-iri units installed. Figure 3-4 shows a detailed 
block diagram of the Dedicated Mode Switch. A schematic 
of this circuit is shown on diagram 3 at the rear of this 
manual. 



Horizontal Mode Switching 

The Horizontal Mode Switching stage determines the 
horizontal display mode, provides plug-in unit alternate 
switching information, and provides readout display 
information. 



The Horizontal Mode Switching circuits, consisting pri- 
marily of SI 57 and SI 59, determine whether the plug-in unit 
in the A HORIZ or B HORIZ compartments is to be dis- 
played by beam 1 or beam 2. A LO level at PI 34 pins 7, 8, 9, 
or 10 indicates the selected mode. Only two pins will be LO 
at the same time. The outputs (PI 34 pins 7, 8, 9, and 10) 
are used in the Horizontal Interface circuits (diagram 11), Z- 
Axis Logic circuits (diagram 5), Auxiliary Z-Axis Logic cir- 
cuits (diagram 5), and Auxiliary Y-Axis Switching circuits 
(diagram 4). 



The Horizontal Mode Switching signals provide plug-in 
unit alternate switching information to the Logic circuits (dia- 
gram 5). A Hi level on PI 29 pins 4, 5, 7, or 8 determines 
which time-base unit (A Horizontal or B Horizontal) alter- 
nates the Left Vertical or Right Vertical units. Only two pins 
will be HI at a time. The alternate switching information is 
coupled to the Left Vertical Alternate Switching stage and 
the Right Vertical Alternate Switching stage on the Logic 
circuit (diagram 5). 



The Horizontal Mode Switching signals are also coupled 
to the Readout Display Logic stage (U191). 



Readout Display Logic 

The Readout Display Logic stage produces horizontal 
mode lockout signals (positive going) to the Readout Sys- 
tem (diagram 17). The lockout signals inhibit the readout 
display of the appropriate plug-in unit. Two negative-input 
gates (U191A, B) provide lockout signals for the A HORIZ 
and B HORIZ compartments, respectively. Figure 3-5 pro- 
vides input/output conditions for the various lockout 
outputs. 



Main Interface 

The Main Interface block includes circuitry for plug-in in- 
terface and interconnections between the plug-in compart- 




REV JUN 1981 



3-7 














































Theory of Operation — 7844/R7844 Service 



S161 



A TRIG 
SOURCE 



SI 63 



BTRIG 

SOURCE 



TRIGGER 

SELECTOR 




S159 
BEAM 2 




S167 



BEAM 2 




BEAMFINDER 


j 







R196 
BEAM 2 

FOCUS f- 



R195 
BEAM 1 

FOCUS | - 



R194 
BEAM 2 



INTENSITY 


h- 


R193 




BEAM 1 




INTENSITY 








HORIZ SEP (1) - 








AUX 



Z-AXIS 




<4> <9><g> 



BEAM 2 VERTICAL 
AND HORIZONTAL AMPLIFIERS 




CRT 

CIRCUIT 




BEAM 2 
Z-AXIS LOGIC 



BEAM 1 

Z-AXIS LOGIC 




BEAM 1 
HORIZONTAL 
AMPLIFIER 



< 3 > 



1676-76 



Fig. 3-4. Detailed block diagram of Dedicated Mode Switch (Option 21 only). 



3-8 



REV JUN 1981 





Theory of Operation — 7844/R7844 Service 




Fig. 3-5. Input/output conditions for Readout Display Logic 
stage. 



merits, circuit boards, etc., of this instrument. The Main 
Interface circuits also include the Auxiliary Y-Axis switching, 
Vertical Separation (1) input, and Beam 2 Gated Switching 
stages. Schematics for the Main Interface circuits are 
shown on diagram 4 at the rear of this manual. 



Auxiliary Y-Axis Switching 

The Auxiliary Y-Axis signal originates in dual time-base 
units, which have an alternate sweep switching mode, and 
is used for vertical trace separation of the delaying sweep 
trace in compatible dual time-base units. The trace separa- 
tion current is added to the beam 1 and beam 2 vertical 
amplifiers in the 7844/R7844 Oscilloscope. Separate Y-axis 
amplifiers are provided for four display possibilities: (1) 
Beam 1 display from the A HORIZ compartment (U90A, 
U90E, Q86), (2) Beam 1 display from B HORIZ compart- 
ment (U90B, U90C, U90D), (3) Beam 2 display from A 
HORIZ compartment (U50A, U50E, Q66), and (4) Beam 2 
display from B HORIZ compartment (U50B, U50C, U50D). 
The beam 1 and beam 2 Y-axis amplifiers are nearly identi- 
cal, except that the beam 2 output is inverted. Only the 
beam 1 circuits will be described. 



Integrated circuits U90E and U90A form an emitter-coup- 
led current amplifier for the auxiliary Y-axis signal from the A 
HORIZ compartment and U90B and U90D form an emitter- 
coupled current amplifier for the auxiliary Y-axis signal from 
the B HORIZ compartment. Only one amplifier will be oper- 
ating at a time. When the A Horizontal time-base unit has 
been selected for beam 1 display, the LO level (approxi- 
mately ground) at P34 pin 7 turns off Q86, which causes 
U90A and U90E to quiescently conduct. Simultaneously, 



the HI level (approximately 5 V) at P34 pin 8 pulls up the 
emitter of U90C, which turns off the B Horizontal circuit 
(U90B, U90D). The auxiliary Y-axis signal from the A Hori- 
zontal time-base unit (J3, pin B16) drives U90E and U90A to 
change the position of the beam 1 trace. 



When the B Horizontal time-base unit has been selected 
for beam 1 display, the LO level (approximately ground) at 
P34 pin 8 turns off U90C, which causes U90D and U90B to 
quiescently conduct. Simultaneously, the HI level (approxi- 
mately 5 V) at P34 pin 7 pulls up the emitter of Q86, which 
turns off the A Horizontal circuit (U90A and U90E). The aux- 
iliary Y-axis signal from the B Horizontal time-base unit (J4, 
pin B16) drives U90D and U90B to change the position of 
the beam 1 trace. 



Vertical Separation (1) input 

The VERT SEP (1) signal from the Crossover Mode 
Switch (diagram 2), is connected to the output of the Beam 
1 Auxiliary Y-Axis Amplifiers (U90, Q86) at pin J16. The 
trace separation signal varies the current, added to the 
Beam 1 Vertical Amplifier, to position the beam 1 trace 
when the same vertical unit is selected for display of both 
beams. Refer to the Vert Sep (1) Control discussion for 
more information (diagram 2). 



Beam 2 Gated Switching 

The Beam 2 Gate Switching circuits provide a positive- 
going gate pulse to the Readout and Graticule Illumination 
pulsed circuits (diagram 1) at the end of beam 2 sweep. 
Integrated circuit U105 provides horizontal mode switching, 
and U107 is a monostable multivibrator that supplies the 
positive-going gate pulse. 



When the A Horizontal time base is selected for beam 2 
display (U105 pins 1 , 2, and 13 are LO), the end of A sweep 
gate (LO) at U105 pin 5 initiates a positive-going beam 2 
gated pulse at U107 pin 6. When the B Horizontal time base 
is selected for beam 2 sweep (U105 pins 1 , 2, and 13 are HI) 
the end of B sweep gate (LO) at U105 pin 12 initiates a 
positive-going beam 2 gated pulse at U 107 pin 6. 



The time constant for monostable multivibrator U107 
(approximately 100 ms) is determined primarily by R106 and 
Cl 06. The feedback loop from the output (U1 07 pin 1 ) to the 
input (U107 pin 4) provides a holdoff function so that the 
monostable multivibrator can stabilize before it accepts an- 
other trigger pulse (sweep gate). 




The Logic circuit develops control signals for use in other 
circuits within this instrument and any plug-in units installed 



REV JUN 1981 



3-9 
















Theory of Operation — 7844/R7844 Service 



or selected. A block diagram of the Logic circuit is shown in 
the Diagrams section. 



This Theory of Operation for the Logic circuit is written 
with the approach that each of the integrated circuits and its 
associated discrete components compose an individual 
stage as shown by the block diagram. The operation of 
each stage is discussed, relating the input signals or levels 
to the output, with consideration given to the various modes 
of operation that may affect the stage. A logic diagram is 
also provided, where applicable, for each stage. These dia- 
grams are not discussed in detail, but are provided to aid in 
relating the function performed by a given stage to standard 
logic techniques. Note that these logic diagrams are not an 
exact representation of the internal structure of the integrat- 
ed circuit, but are only a logic diagram of the function per- 
formed by the stage. An input/output table is given, where 
applicable, for use along with the Theory of Operation and 
logic diagram. These input/output tables document the com- 
bination of input conditions that are necessary to perform 
the described function of an individual stage. 



Clock Generator 

Part of integrated circuit U205, along with the external 
components shown in Fig. 3-6, make up the Clock Gener- 
ator stage. Resistor R1 and transistors Q1, Q2, and Q3 
represent an equivalent circuit within U205. This circuit, 
along with discrete components C210, R206, R207, and 
R210, compose a 2 MHz free-running oscillator to provide a 
timing (Clock) signal used to synchronize the amplifier plug- 
in unit chopping mode. Following is a description of the op- 
eration of this stage. 



Assume that Q2 is conducting and Q1 is off. The collec- 
tor current of Q2 produces a voltage drop across R1 to cut 
off Q1. This negative level at the collector of Q2 is also 
connected to pin 14 through Q3 as shown in Fig. 3-6 (B) at 
time T Since there is no current through Q1, capacitor 
C210 begins to charge toward —15 V through R206 and 
R207. The emitter of Q1 goes negative as C210 charges, 
until it reaches a level approximately 0.6 V more negative 
than the level at its base. Then, Q1 is forward biased and its 
emitter rapidly rises positive (see time T on waveforms). 
Since C210 cannot change its charge instantaneously, the 
sudden change in voltage at the emitter of Q1 also pulls the 
emitter of Q2 positive. Then, Q2 is reverse biased and its 
collector rises positive to produce a positive output level at 
pin 14. 



Now, conditions are reversed. Since Q2 is reverse bi- 
ased, there is no current through it. Therefore, C210 can 
begin to discharge through R210. The emitter level of Q2 
follows the discharge of C210 until it reaches a level ap- 
proximately 0.6 V more negative than its base. Then, Q2 is 
forward biased and its collector drops negative and Q1 is 



reverse biased. The level at pin 14 also drops negative to 
complete the cycle. Once again, C210 begins to charge 
through R206 and R207 to start the second cycle. 



Two outputs are provided from this oscillator. The Delay 
Ramp signal from the junction of R206 and R207 is connect- 
ed to the Chopped Blanking stge. This signal has the same 
waveshape as shown by the waveform at pin 13; its slope is 
determined by the divider ratio between R206 and R207. A 
square-wave output is provided at pin 1 4. The frequency of 
this square wave is determined by the overall RC relation- 
ship between C210, R206, R207, and R210 with duty cycle 
determined by the ratio of R206 and R207 to R210. 



The square wave at pin 14 is connected to pin 16 
through C21 1 . Capacitor C21 1 , along with the internal resis- 
tance of U205, differentiates the square wave at pin 14 to 
produce a negative-going pulse coincident with the falling 
edge of the square wave (positive-going pulse coincident 
with rising edge has no effect on circuit operation). This neg- 
ative-going pulse is connected to pin 1 5 through an inverter- 
shaper that is also part of U205. The output at pin 15 is a 
positive-going Clock pulse with a repetition rate of approxi- 
mately 2 MHz. 



Chop Blanking 

The Chop Blanking stage is made up of the remainder of 
U205. This stage determines if beam 1 or beam 2 chop 
blanking pulses are required, based on the operating mode 
of the dual-trace amplifier plug-in units installed in the verti- 
cal compartments. A beam 1 chop blanking signal is present 
at pin 4 of U205 when an enable pulse (LO) is present at pin 
5. A beam 2 chop blanking signal is present at pin 2 of U205 
when an enable pulse (LO) is present at pin 8. The repetition 
rate of the negative-going chop blanking pulse output (pins 
2 and 4 of U205) is approximately 2 MHz as determined by 
the Clock Generator stage. 



The delay ramp signal from the Clock Generator stage 
determines the repetition rate and pulse width of the 
chopped blanking pulses. The delay ramp applied to pin 10 
of U205 starts to go negative from a level of approximately 
+ 1.1 V coincident with the leading edge of the clock pulse 
(see waveforms in Fig. 3-7). This results in a HI quiescent 
condition for the chopped blanking pulse. The slope of the 
negative-going delay ramp is determined by the Clock Gen- 
erator stage. As it reaches a level slightly negative from 
ground, the chopped blanking pulse output level changes to 
the LO state and remains LO until the delay ramp goes HI 
again. 



Notice the delay between the leading edge of the clock 
pulse, generated by U205, and the leading edge of the 



3-10 



REV JUN 1981 




Theory of Operation — 7844/R7844 Service 




Fig. 3-6. (A) Diagram of Clock Generator stage; (B) Idealized waveforms for Clock Generator stage. 




Fig. 3-7. Idealized waveforms for Chop Blanking stage. 



REV JUN 1981 



3-11 







Theory of Operation — 7844/R7844 Service 



chopped blanking pulses. The amount of delay between the 
leading edges of these pulses is determined by the delay 
ramp applied to pin 10. This delay is necessary due to the 
delay line in the vertical deflection system. Otherwise, the 
trace blanking resulting from the chopped blanking pulse 
would not coincide with the switching between the displayed 
traces. The duty cycle of the square wave produced in the 
Clock Generator stage determines the pulse width of the 
chopped blanking pulses (see Clock Generator description 
for more information). 



Holdoff Buffer Circuits 

The A and B Horizontal Holdoff Buffer circuits provide 
the drive for the respective holdoff signals and develop the 
logic levels necessary for the alternate switching circuits. 
Integrated circuits U233A and U233D comprise the A 
Holdoff Buffer and U233B and U233C comprise the B 
Holdoff Buffer. 



A and B Horizontal Alternate Switching 

The A and B Horizontal Alternate Switching stages 
(U239B and U239A, respectively) provide the alternate 
switching signals to the Left Vertical and Right Vertical Al- 
ternate Switching stages. The Horizontal Alternate Switch- 
ing circuits are driven by the respective holdoff signals from 
the A and B Holdoff Buffer stages. The A Horizontal and B 
Horizontal Alternate Switching circuits have the same basic 
operation; therefore, only the A Horizontal Alternate Switch- 
ing stage will be described. 



The A Alternate Flip-Flop, U239B, is a divide-by-2 device 
with a direct-clear input. The direct-set input is held inactive 
by the 5 V level through R240 to pin 10. The direct-clear 
input, at pin 13, is held inactive when the 7844/R7844 is not 
operating in the X-Y mode. The zero output at pin 8 is tied 
directly to the data input at pin 12, thereby causing the out- 
put at pin 9 to go HI with every other holdoff pulse at the 
clock input (pin 1 1 ). The output at pin 9 is coupled to the A 
Alternate Gate of the Left and Right Alternate Switching 
stages (U265 and U275 respectively). Refer to Fig. 3-9 for 
additional information. 



When the 7844/R7844 is operating in the X-Y mode, 
(that is, an amplifier unit is operating in a horizontal com- 
partment or a time-base unit is operating in the amplifier 
mode) a LO level is coupled from circuit board pin G to the 
clear input at U239B pin 13. The LO input clears the inte- 
grated circuit thereby disabling the circuit. 



End AB Alternate Logic 

The End of AB Alternate Logic circuit is used only when 
one amplifier unit (set for alternate operation) is selected for 
vertical deflection of both beams 1 and 2 and different time- 



base units are selected for the horizontal deflection of 
beams 1 and 2. The End of AB Alternate Logic circuits en- 
sure that the amplifier unit, providing vertical deflection, 
does not alternate in the middle of a sweep or alternate 
before a sweep is completed. 



When operating in the End of AB Alternate condition, the 
B Horizontal time-base unit completes a sweep and locks 
out further B Horizontal sweeps until the completion of the 
next A Horizontal sweep. A Horizontal sweeps that end be- 
fore the end of the B Horizontal sweep have no effect on 
alternate operation of the amplifier unit. 



The End of AB Alternate Logic stage consists primarily of 
integrated circuits U235, U237, and U245. A timing diagram 
for the End of AB Alternate Logic is given in Fig. 3-8. A 
detailed description is given in the discussion that follows. 



The end of AB Alternate Logic stage is activated by a HI 
level from the End AB line (P229-9). The HI level removes 
the clear from U237A at pin 1 . Refer to the Plug-In Alternate 
Logic discussion lor the origin of the End AB signal (diagram 
2). At the end of B Horizontal sweep, the HI holdoff level, at 
pin AK, is inverted by U233B and U233C (B Horizontal 
Holdoff Buffer) and clocks U237A at pin 3. The output at pin 
5 of U237A begins to raise HI but is clamped by CR237. At 
the end of B Holdoff, the HI output from U233B pin 6 raises 
the clamp level of CR237 and allows U237A pin 5 to raise 
HI, thereby enabling one-half of gate U235B. The HI level at 
U237A pin 5 also removes the clear from U245B pin 13 and 
is coupled to circuit board pin AJ, which initiates B Sweep 
Lockout. 



At the end of A Horizontal sweep, the HI holdoff level at 
circuit board pin M, is inverted by U233A and inverted again 
by U233D (A Horizontal Holdoff Buffer). The positive transi- 
tion at U233D pin 11 is coupled through C238, which en- 
ables the other half of gate U235B (pin 5). Pin 6 of U235B 
goes LO and is inverted by U235C. The HI level at pin 1 1 of 
U237B clocks the Flip-Flop. The output at U237B pins 8 and 
9 changes states. The output at pin 9 is coupled to the End 
of AB gate of the Left Vertical Alternate switching stage 
(U265) and the Right Vertical Alternate switching stage 
(U275). Refer to Fig. 3-9 for additional information. 



The clear level at pin 13 of U237B is controlled by the X- 
Y Compensation signal at pin G on the circuit board. The 
clear (ground level) is applied only when an amplifier unit is 
installed in a horizontal compartment or when the time-base 
unit is operating in the amplifier mode. 



When divide-by-2 Flip-Flop U237B switches, a negative 
transition is coupled through C242 or C246, depending 
upon the level at pins 9 and 10 of U237B. The LO transition 



3-12 



REV JUN 1981 




Theory of Operation — 7844/R7844 Service 




Fig. 3-8. Timing diagram for End of AB Alternate Logic. 



at gate U235D sets the output at pin 11 HI. The HI level Refer to Fig. 3-9 for a functional diagram of the Left and 

clocks pin 11 of U245B, which sets pin 9 HI and enables Right Vertical Alternate Switching circuits, 

one-half of gate U235A. At the end of A holdoff, the nega- 
tive transition at circuit board pin M is inverted by U233A 

and enables the other half of gate U235A. The output at The alternate switching circuits (U265 and U275) each 

U235A pin 3 goes LO and clears U237A, which sets pin 5 consists of four AND gates coupled into a NOR gate (each 

LO. The LO at pin 5 clears U245B at pin 13, inhibits gate AND gate has two inputs). Refer to the vertical alternate 

U235B at pin 4, and terminates B Sweep Lockout at circuit switching functional diagram in Fig. 3-9. Operation of the 

board pin AJ. Left Vertical Alternate Switching and Right Vertical Alter- 

nate Switching circuits is identical; therefore, only the left 
circuit will be explained. 

Left Vertical and Right Vertical Alternate Switching 

The Left Vertical and Right Vertical Alternate switching 

stages provide the alternate switching signal to the vertical X-Y Mode Alternate Gate. The X-Y Mode Alternate 

and horizontal plug-in compartments. The alternate drive Gate (as shown in Fig. 3-9) is controlled by the X-Y Corn- 

signal is used by dual-channel amplifier plug-in units that are pensation signal and the X-Y Alternate Switching signal at 

operating in the alternate mode, to alternately switch be- pins 4 and 5 of U265, respectively. When the X-Y Compen- 

tween channels. Integrated circuit U265 provides alternate sation signal at circuit board pin G is LO, the 7844/R7844 is 

switching for the Left Vertical plug-in unit and U275 pro- operating in the X-Y mode. That is, either an amplifier unit is 

vides alternate switching for the Right Vertical plug-in unit. operating in a horizontal compartment or a time-base unit is 



REV JUN 1981 



3-13 





Theory of Operation — 7844/R7844 Service 




1676-82 



Fig. 3-9. Functional diagram of Left and Right Vertical Alternate Switching stages. 



3-14 



REV JUN 1981 





Theory of Operation — 7844/R7844 Service 



operating in the amplifier mode. The LO level reverse biases 
Q255, its collector rises, and a HI level is coupled to pin 5 of 
U265. The HI level at pin 5 of U265 sets one half of the gate 
(X-Y Mode Alternate Gate as shown in Fig. 3-9) and also 
removes the clear from U215B at pin 13. The X-Y Alternate 
Switching signal, from pin 8 of Horizontal Lockout integrat- 
ed circuit U285, clocks pin 1 1 of U215B. The output at pin 9 
of divide-by-2 Flip-Flop U215B goes HI with every other 
clock pulse at pin 1 1 . The HI level at pin 4 of U265 is invert- 
ed by the NOR gate and appears as a LO at U265 pin 8 (and 
vice-versa). The level at U265 pin 8 (non-inverted) is coupled 
through the Left Vertical Alternate Buffer (Q260, Q266). A 
HI level at circuit board pin O displays channel 2 of the plug- 
in unit and a LO level displays channel 1 . 



End AB Alternate Gate. The End AB Alternate Gate (as 
shown in Fig. 3-9) is controlled by the End AB Left signal 
(derived from diagram 2 or 3) and by the End AB Alternate 
Switching signal at U265 pin 10. A HI level at U265 pin 9 
indicates that the Left Vertical plug-in unit is operating in the 
End of AB Mode by setting one-half of the gate. Refer to the 
End AB Logic discussion and End AB Control discussion 
(diagram 2) for information on the End AB Left signal. The 
End AB Alternate Switching signal is produced by the End 
AB Logic stage (output at U237B pin 9) and coupled to 
U265 pin 10. A HI level at U265 pin 10 is inverted by the 
NOR gate and appears as a LO at U265 pin 8 (and vice- 
versa). The level at U265 pin 8 (non-inverted) is coupled 
through the Left Vertical Alternate Buffer (Q260, Q266). A 
HI level at circuit board pin O displays channel 2 of the plug- 
in unit and a LO level displays channel 1 . 



A Alternate Gate. The A Alternate gate is controlled by 
the A Alternate Left signal and the A Alternate Switching 
signal at U265 pins 13 and 1, respectively. (Refer to Fig. 
3-9.) 



A HI level at U265 pin 13 indicates that the Left Vertical 
plug-in unit will be alternated by the time-base unit in the A 
HORIZ compartment by setting one-half of the gate. Refer 
to Horizontal Mode Switching in the Dedicated Mode Switch 
description (diagram 3) or Alternate Switching Logic in the 
Crossover Mode Switch description (diagram 2) for informa- 
tion on A Alternate Left signal. 



The A Alternate Switching signal is produced by the A 
Horizontal Alternate Switching stage (output at U239B pin 
9) and is coupled to U265 pin 1 . The HI level at U265 pin 1 is 
inverted by the gate for a LO level at U265 pin 8 (and vice- 
versa). The level at U265 pin 8 is coupled (non-inverted) 
through the Left Vertical Alternate Buffer (Q260 and Q266). 
A HI level at circuit board pin 0 displays channel 2 of the 
plug-in unit and a LO level displays channel 1 . 



B Alternate Gate. The B alternate gate is controlled by 
the B Alternate Left signal and the B Alternate Switching 
signal at pins 2 and 3 of U265 (refer to Fig. 3-9). 



A HI level at U265 pin 2 indicates that the Left Vertical 
plug-in unit will be alternated by the time-base unit in the B 
HORIZ compartment by setting one-half of the gate. Refer 
to Horizontal Mode Switching in the Dedicated Mode Switch 
description (diagram 3, Option 21) or Alternate Switching 
Logic in the Crossover Mode Switch description (diagram 2) 
for information on B Alternate Left signal. 



The B Alternate Switching signal is produced by the B 
Horizontal Alternate Switching stage (output at U239A pin 
5) and is coupled to U265 pin 3. The HI level at U265 pin 3 is 
inverted by the NOR gate for a LO level at U265 pin 8 (and 
vice-versa). The level at U265 pin 8 (non-inverted) is coupled 
through the Left Vertical Alternate Buffer Q260, Q266. A HI 
level at circuit board pin O displays channel 2 of the plug-in 
unit and a LO level displays channel 1 . 



Output Buffers 

The output commands from the Logic circuits are pro- 
vided through buffer stages Q220-Q226, Q260-Q266, and 
Q270-Q276. Each of these stages includes a common-base 
input transistor to provide a low-impedance load for the as- 
sociated driving stages. The output transistor is connected 
as an emitter follower to proivide isolation between the Log- 
ic circuits and other circuits within the instrument or the 
plug-in units. 



Horizontal Logic 

The Horizontal Logic stage (U285) provides the alternate 
switching signal when the 7844/R7844 is operating in the X- 
Y mode. That is, either an amplifier unit is operating in a 
horizontal compartment or a time-base unit is operating in 
the amplifier mode. The horizontal compartment with the 
operating time-base unit provides the holdoff pulse for alter- 
nate switching (see Fig. 3-10). The alternate pulse is coup- 
led from U285 pin 8 to divide-by-2 Flip-Flop U215B at pin 
1 1 . The output of U215B (pin 9) is coupled to the Left and 
Right Vertical Alternate Switching stages (U265 and U275). 



The alternate pulse is produced at the end of A or B 
sweep, depending upon the conditions shown in Fig. 3-10. 
The holdoff gate, produced at the end of the respective 
sweep, is differentiated by either C280 or C281 to provide a 
positive-going pulse to pins 6 or 9 of U285. Elements, inter- 
nal to the integrated circuit (U285), hold the levels at pins 6 
and 9 LO unless a HI holdoff gate is received. 



REV JUN 1981 



3-15 




Theory of Operation — 7844/R7844 Service 



B 








m 


m 


m 




A HORIZ-TIME BASE 

B horiz-amplifier 


HI 


HI 


LO 


A 


A HORIZ-AMPLIFIER 
B HORIZ-TIME BASE 


HI 


LO 


HI 


B 


ALL OTHER COMBINATIONS 


NO OUTPUT PULSE 
(LOAT OUTPUT) 


1676-83 



Fig. 3-10. Input/output conditions for Horizontal Logic Alternate 
Switching. 



Beam 1 Z-Axis Logic 

The Beam 1 Z-Axis Logic stage produces output cur- 
rents that determine the intensity of the beam 1 display. The 
level of the beam 1 Z-axis output current is determined by 
the BEAM 1 INTENSITY control setting, by current added 
for auxiliary Z-axis functions, or by an external signal ap- 
plied to the Z-AXIS INPUT 1 connector. When an amplifier 
unit is operating in the chop mode, the beam 1 display is 
blanked by the chop blanking signal. A current-limiting cir- 
cuit protects the crt from excessive beam intensity. Integrat- 
ed circuit U335 provides beam 1 Z-Axis Logic and U315 and 
Q304 provide beam 1 Auxiliary Z-Axis Logic. Refer to Fig. 3- 
11 for a functional diagram. 



Chop Blanking Z-Axis Logic. The beam 1 vertical chop 
blanking signal at U335 pin 6 disables the Z-axis output 
current at U335 pin 8 during plug-in unit vertical chop 
blanking. The beam 1 chop blanking signal is coupled from 
U205 pin 4 directly to pin 6 of U335. Quiescently, the level at 
pin 6 is HI so that the intensity current through pins 1, 2, 9, 
10, and 16 can pass to the output. However, during plug-in 
unit vertical chop blanking, the level at pin 6 is LO and the 
output current at pin 8 is blocked, which blanks the beam 1 
crt display. 



Mainframe Intensified Z-Axis Logic. When the 
7844/R7844 is operating in an intensified mode, with a de- 
laying time-base unit in the A HORIZ compartment and a 
delayed time-base unit in the B HORIZ compartment, cur- 
rent for the intensified zone is supplied from the BEAM 1 
INTENSITY control to U335 pin 2. Current is added to the 
beam 1 intensity current during the time that the delayed (B) 
sweep runs. The delaying sweep time is indicated by a HI 
level at U335 pin 14 (A Gate) and the delayed sweep time is 




Fig. 3-11. Functional diagram of Beam 1 Z-Axis Logic (U335). 



indicated by a HI level at U335 pin 4 (B Gate). The HI level at 
U335 pin 5 indicates that the time-base unit in the A HORIZ 
compartment is operating in the delaying mode. A LO level 
at pin 15 (pin 15 is LO when the A HORIZ compartment has 
been selected for display) routes current to pin 8 during the 
time that the B Gate (pin 4) is HI. With this method of 
supplying current for intensified sweep, the intensified cur- 
rent increases as the BEAM 1 INTENSITY control setting is 
advanced to provide a proportional intensity increase in the 
intensified zone as the overall beam 1 intensity increases. 
The A Holdoff signal (from circuit board pin M) is coupled 
through CR288 to U335 pin 2 to immediately terminate the 
intensified zone at the end of A sweep. 



Dual Time-Base Intensified Z-Axis Logic. The beam 1 
horizontal Z-Axis Logic circuit provides the additional cur- 
rent needed to intensify the delaying sweep of a dual time- 
base unit (selected for display of beam 1) during the time 
that the delayed sweep generator runs. Separate beam 1 
auxiliary Z-axis amplifiers are provided for the dual time- 
base units installed in the A HORIZ and B HORIZ 
compartments. 



Integrated circuits U315C and U315B form an emitter- 
coupled current amplifier for the auxiliary Z-axis signal from 
the A HORIZ compartment, and U315A and U315D form an 
emitter-coupled current amplifier for the auxiliary Z-axis sig- 
nal from the B HORIZ compartment. Only one amplifier will 



3-16 



REV JUN 1981 

















Theory of Operation — 7844/R7844 Service 



be operating at a time. When the A Horizontal time-base 
unit has been selected for beam 1 display, the LO level (ap- 
proximately ground) at circuit board pin H turns off U315E, 
which causes U315C and U315B to quiescently conduct. 
Simultaneously, the HI level (approximatley 5 V) at circuit 
board pin J pulls up the emitter of Q304, which turns off the 
B horizontal circuit (U315D and U315A). In this condition, 
quiescent current to U335 pin 10 is supplied through R314, 
U315B, and R315. The auxiliary Z-axis signal from the A 
Horizontal time-base unit (circuit board pin AB) modulates 
the base of U315C to intensify the time-base unit delaying 
sweep trace. 



When the B Horizontal time-base unit has been selected 
for beam 1 display, the LO level (approximately ground) at 
circuit board pin J turns off Q304, which causes U315A and 
U315D to quiescently conduct. Simultaneously, the HI level 
(approximately 5 V) at circuit board pin H pulls up the 
emitter of U315E, which turns off the A Horizontal circuit 
(U315B and U315C). In this condition, quiescent current to 
U335 pin 10 is supplied through R315, U315A, and R314. 
The auxiliary Z-axis signal from the B Horizontal time-base 
unit (circuit board pin Z) modulates the base of U315D to 
intensify the time-base unit delaying sweep trace. 



A LO level is present at circuit board pin V when the time- 
base unit in the A HORIZ compartment is operating in the 
independent mode. The LO level turns on Q286, which robs 
current from pin 2 of U335. This ensures that the intensifed 
zone will not be momentarily turned on by changes in the A 
Holdoff signal. 



Intensity Limit Z-Axis Logic. Transistor Q328 initiates 
an intensity limit at U335 pin 7. Quiescently, Q328 is reverse 
biased and resistors R324, R325, R326, R330, and R334 
establish the current at pins 7 and 9 of U335. When Q328 is 
turned on, current is robbed from U335 pin 7, thereby reduc- 
ing the Z-axis output at U335 pin 8. Transistor Q328 can be 
turned on by three signals: (1) the Intensity Limit signal, 
which is LO at circuit board pin L when the time-base unit 
(selected for beam 1) is slower than 0.1 s/div; (2) the X-Y 
Compensation signal, which is LO at circuit board pin G 
when an amplifier unit is operating in a horizontal compart- 
ment or a time-base unit is operating in the amplifier mode; 
(3) the Beam I Sense signal, which is HI at circuit board pin 
E whenever the crt beam current is excessive. 



VERT compartment, to modulate the display intensity. Di- 
odes CR331 and CR332 limit the maximum voltage change 
at pin 9 to approximately +0.6 and —0.6 V to protect U335 
from excessive voltage input. A positive input at pin 9 de- 
creases beam 1 trace intensity. 



Beam 2 Z-Axis Logic 

The Beam 2 Z-Axis Logic stage produces output cur- 
rents that determine the intensity of the beam 2 display. The 
level of the beam 2 Z-axis output current is determined by 
the BEAM 2 INTENSITY control setting, by current added 
for auxiliary Z-axis functions, or by an external signal ap- 
plied to the Z-AXIS INPUT 2 connector. When an amplifier 
unit is operating in the chop mode, the beam 2 display is 
blanked by the chop blanking signal. Beam 2 is also blanked 
by the Z-axis inhibit signal while readout is being displayed. 
A current-limiting circuit protects the crt from excessive 
beam intensity. Integrated circuit U375 provides beam 2 Z- 
Axis Logic and U355 and Q344 provide beam 2 Auxiliary Z- 
Axis Logic. Refer to Fig. 3-12 for a functional diagram. 



AUXILIARY Z-AXIS — 

CHOP BLANKING 
READOUT BLANKING 

INTENSITY LIMIT 

AUXILIARY Z AXIS 
FROM VERTICAL UNIT 

EXTERNAL Z-AXIS 
DELAY MODE CONTROL - 
HORIZONTAL BINARY (A OR B) - 

A GATE 

B GATE 



10 



DELAYING SWEEP 

INTENSIFIED (DUAL TIME BASE) 

BEAM 2 INTENSIFIED 



U375 
BEAM 2 
Z-AXIS 
LOGIC 



d 



BEAM 2 
Z-AXIS 
SIGNAL 



1676-87 



Fig. 3-12. Functional diagram of Beam 2 Z-Axis Logic (U375). 



External and Vertical Auxiliary Z-Axis Inputs. The cur- 
rent levels established by the BEAM 1 INTENSITY control 
can be varied by the auxiliary Z-axis signal from the LEFT 
VERT compartment (circuit board pin AG) or by an external 
signal applied to the rear-panel Z-AXIS INPUT 1 connector 
(J330). The auxiliary and external Z-axis signals are applied 
to U335 pin 9. The Z-AXIS INPUT 1 connector allows the 
trace to be modulated by an external signal. The auxiliary Z- 
axis input allows special purpose plug-in units, in the LEFT 



Chop Blanking Z-Axis Logic. The beam 2 vertical chop 
blanking signal at U375 pin 6 disables the Z-axis output 
current at U375 pin 8 during plug-in unit vertical chop 
blanking. The beam 2 chop blanking signal is coupled from 
U205 pin 2 directly to pin 6 of U375. Quiescently, the level at 
pin 6 is HI so that the intensity current through pins 1, 2, 9, 
1 0, and 1 6 can pass to the output. However, during plug-in 
unit vertical chop blanking, the level at pin 6 is LO and the 
output current at pin 8 is blocked, which blanks the beam 2 
crt display. 



REV JUN 1981 



3-17 





Theory of Operation— 7844/R7844 Service 



Mainframe Intensified Z-Axis Logic. When the 
7844/R7844 is operating in an intensified mode, with a de- 
laying time-base'unit in the A HORIZ compartment and a 
delayed time-base unit in the B HORIZ compartment, cur- 
rent for the intensified zone is supplied from the BEAM 2 
INTENSITY control to U375 pin 2. Current is added to the 
beam 2 intensity current during the time that the delayed (B) 
sweep runs. The delaying sweep time is indicated by a HI 
level at U375 pin 14 (A Gate) and the delayed sweep time is 
indicated by a HI level at U375 pin 4 (B Gate). The HI level at 
U375 pin 5 indicates that the time-base unit in the A HORIZ 
compartment is operating in the delaying mode. A LO level 
at pin 15 (pin 15 is LO when the A HORIZ compartment has 
been selected for display) routes current to pin 8 during the 
time that the B Gate (pin 4) is HI. With this method of 
supplying current for intensified sweep, the intensified cur- 
rent increases as the BEAM 2 INTENSITY control setting is 
advanced to provide a proportional intensity increase in the 
intensified zone as the overall beam 2 intensity increases. 
The A Holdoff signal (from circuit board pin M) is coupled 
through CR289 to U375 pin 2 to immediately terminate the 
intensified zone at the end of A sweep. 



A LO level is present at circuit board pin V when the time- 
base unit in the A HORIZ compartment is operating in the 
independent mode. The LO level turns on Q286, which robs 
current from pin 2 of U375. This ensures that the intensifed 
zone will not be momentarily turned on by changes in the A 
Holdoff signal. 



External and Vertical Auxiliary Z-Axis Inputs. The cur- 
rent levels established by the BEAM 2 INTENSITY control 
can be varied by the auxiliary Z-axis signal from the LEFT 
VERT compartment (circuit board pin AC) or by an external 
signal applied to the rear-panel Z-AXIS INPUT 2 connector 
(J370). The auxiliary and external Z-axis signals are applied 
to U375 pin 9. The Z-AXIS INPUT 2 connector allows the 
trace to be modulated by an external signal. The auxiliary Z- 
axis input allows special purpose plug-in units, in the RIGHT 
VERT compartment, to modulate the display intensity. Di- 
odes CR371 and CR372 limit the maximum voltage change 
at pin 9 to approximately +0.6 and —0.6 V to protect U375 
from excessive voltage input. A positive input at pin 9 de- 
creases beam 2 trace intensity. 



Dual Time-Base Intensified Z-Axis Logic. The Beam 2 
Horizontal Z-Axis Logic circuit provides the additional cur- 
rent needed to intensify the delaying sweep of a dual time- 
base unit (selected for display of beam 2) during the time 
that the delayed sweep generator runs. Separate beam 2 
auxiliary Z-axis amplifiers are provided for the dual time- 
base units installed in the A HORIZ and B HORIZ compart- 
ments. Integrated circuits U355C and U355B form an 
emitter-coupled current amplifier for the auxiliary Z-axis sig- 
nal from the A HORIZ compartment, and U355D and U355A 
form an emitter-coupled current amplifier for the auxiliary Z- 
axis signal from the B HORIZ compartment. Only one ampli- 
fier will be operating at a time. When the A Horizontal time- 
base unit has been selected for beam 2 display, the LO level 
(approximately ground) at circuit board pin F turns off 
U355E, which causes U355C and U355B to quiescently 
conduct. Simultaneously, the HI level (approximately 5 V) at 
circuit board pin K pulls up the emitter of Q344, which turns 
off the B Horizontal circuit (U355D, U355A). In this condi- 
tion, quiescent current to U375 pin 10 is supplied through 
R355, U355, and R354. The auxiliary Z-axis signal from the 
A Horizontal time-base unit (circuit board pin AB) modulates 
the base of U355C to intensify the time-base unit delaying 
sweep trace. 

When the B Horizontal time-base unit has been selected 
for beam 2 display, the LO level (approximately ground) at 
circuit board pin K turns off Q344, which causes U355A and 
U355D to quiescently conduct. Simultaneously, the HI level 
(approximately 5 V) at circuit board pin F pulls up the emitter 
of U355E, which turns off the A Horizontal circuit (U355B 
and U355C). In this condition, quiescent current to U375 pin 
10 is supplied through U315, U315A, and R314. The auxil- 
iary Z-axis signal from the B Horizontal time-base unit (cir- 
cuit board pin Z) modulates the base of U355D to intensify 
the time-base unit delaying sweep trace. 



Intensity Limit Z-Axis Logic. Transistor Q328 initiates 
intensity limit at U375 pin 7. Quiescently, Q328 is reverse 
biased and resistors R364, R365, R366, R370, and R374 
establish the current at pins 7 and 9 of U375. When Q328 is 
turned on, current is robbed from R364 and R365 thereby 
reducing the Z-axis output at U375 pin 8. Transistor Q328 
can be turned on by three signals: (1) the intensity Limit 
signal, which is LO at circuit board pin L when the time-base 
unit (selected for beam 2) is slower than 0.1 s/div; (2) the X- 
Y Compensation signal, which is LO at circuit board pin G 
when an amplifier unit is operating in a Horizontal compart- 
ment or a time-base unit is operating in the amplifier mode; 
(3) the Beam I Sense signal, which is HI at circuit board pin 
E whenever the crt beam current is excessive. 



Readout Inhibit Z-Axis Logic. Transistor Q360 controls 
the levels at U375 pins 6 and 7 for readout displays. The Z- 
Axis Inhibit signal from the Readout System (J339) is con- 
nected to the base of Q360 through VR359 and R360. This 
level is normally HI, so Q360 operates as controlled by the 
plug-in unit chop blanking pulses at its emitter. When a 
readout display is to be presented, the Z-Axis Inhibit signal 
drops LO and is coupled to the base of Q360 through 
VR359 with little attenuation. The LO level reverse biases 
Q360 and its emitter goes LO. The LO level is coupled to 
U375 pins 6 and 7 to block the Beam 2 Z-Axis Logic output 
during readout display. 



Trigger Selector 

The Trigger Selector circuit determines the source of the 
internal triggering signals connected to the A and B HORIZ 
plug-in compartments. Figure 3-13 shows a detailed block 
diagram of the Trigger Selector circuit. A schematic of the 




3-18 



REV JUN 1981 




Theory of Operation — 7844/R7844 Service 



FROM 
B TRIG 
SOURCE 




TRIGGER SIGNAL 
TO B HORIZONTAL 
UNIT 




TRIGGER SIGNAL 
TO A HORIZONTAL 
UNIT 




FROM 
A TRIG 
SOURCE 
SWITCH 



<2>° r <3> 




1676-86 



Fig. 3-13. Detailed block diagram of Trigger Selector circuit. 



Trigger Selector circuit is shown on diagram 6 at the rear of 
this manual. 



Trigger Amplifier 

The trigger amplifier stages (U41 5 and U51 5) receive trig- 
ger signals from their respective vertical plug-in compart- 
ments and supply trigger signals to both channel switches. 



A and B Trigger Channel Switches 

The A Trigger Channel Switch circuit routes trigger sig- 
nals from either the LEFT VERT or RIGHT VERT plug-in 
compartments to the A HORIZ plug-in compartment. The A 
TRIG SOURCE switch (SI 61) determines which trigger sig- 
nal will be allowed to pass through the A Trigger Channel 
Switch circuit. 



The A Trigger Channel Switch operates as follows: first, 
assume that pin 1 of P445 is grounded by the A TRIG 
SOURCE switch. Transistor Q556 saturates when its base 
goes negative. The voltage at the emitter of Q556 also goes 
negative and turns Q550 off. The collector of Q550 then 
goes positive to reverse bias CR546. Transistors Q560 and 
Q558 are forward biased by the emitter voltage of Q556, 
which provides the signal path for the trigger signals from 
pins 6 and 8 of U515 to J552 and J451. At the same time. 



Q456 turns off to reverse bias Q460 and Q458, which pre- 
vents the trigger signals from pins 6 and 8 of U415 from 
reaching J552 and J451 . Also, Q450 turns on and forward 
biases CR446, which shunts the trigger signal from pins 6 
and 8 of U415 to the +5 V supply through Q450. 



Conversely, when pin 1 of P445 is ungrounded, Q560 
and Q558 are reverse biased preventing the trigger signal at 
pins 6 and 8 of U515 from reaching J552 and J451. At the 
same time, Q458 and Q460 are forward biased providing a 
path for the trigger signal from pins 6 and 8 of U415 to 
reach J552 and J451 . 



The B Trigger Channel Switch stage routes trigger sig- 
nals from either the LEFT VERT or RIGHT VERT plug-in 
compartment to the B HORIZ plug-in compartment. Other- 
wise, the operation of the B Trigger Channel Switch is the 
same as for the A Trigger Channel Switch. 



Crossover Vertical Interface 

The Crossover Vertical Interface stage determines 
whether the Left or Right Vertical units provide the input 
signal to the Beam 1 and Beam 2 Vertical Amplifiers as 
selected by the VERTICAL MODE switch (diagram 2). Sep- 
arate preamplifiers are provided for the left and right vertical 




REV JUN 1981 



3-19 



L 





Theory of Operation— 7844/R7844 Service 



signals to the Beam 1 Vertical Amplifier and to the Beam 2 
Vertical Amplifier (four total). The Readout Inhibit stage dis- 
ables the Beam 2 Preamplifiers during the readout display. 
Figure 3-1 4 shows a block diagram of the Crossover Verti- 
cal Interface circuits and a schematic is shown on diagram 7 
in the Diagrams section of this manual. 



Left and Right Input Buffer Stages 

Emitter follower transistors Q3602 and Q3604 form the 
input buffer stage for the vertical signal from the LEFT 
VERT compartment. Resistors R361 1 and R3601 , in paral- 
lel with the input impedance of Q3604 and Q3602, provide a 
50 Q termination for the differential signal. The Left Vertical 
Input Buffer stage drives the Left Beam 1 Preamplifier 
(U3615) and the Left Beam 2 Preamplifier (U3665) stages. 



Emitter follower transistors Q3702 and Q3704 form the 
input buffer stage for the vertical signal from the RIGHT 
VERT compartment. Resistors R3701 and R3711, in paral- 
lel with the input impedance of Q3702 and Q3704, provide a 
50 9. termination for the differential signal. The Right Vertical 
Input Buffer stage drives the Right beam 1 Preamplifier 
(U3715) and the Flight Beam 2 Preamplifier (U3765) stages. 



Vertical Preamplifiers 

Four preamplifiers are provided for the vertical signals 
from the Left and Right Vertical compartments as selected 
by the front-panel VERTICAL MODE switch: (1) integrated 
circuit U3615 preamplifies the left vertical signal to the 
Beam 1 Vertical Amplifier; (2) integrated circuit U3715 
preamplifies the right vertical signal to the Beam 1 Vertical 




Fig. 3-14. Detailed block diagram of the Crossover Vertical Interface circuit. 



3-20 



REV JUN 1981 
















Theory of Operation — 7844/R7844 Service 



Amplifier; (3) integrated circuit U3665 preampiifies the left 
vertical signal to the Beam 2 Vertical Amplifier; and (4) inte- 
grated circuit U3765 preamplifies the right vertical signal to 
the Beam 2 Vertical Amplifier. The differential signal from 
the Beam 1 Preamplifiers (U3615 or U3715) is coupled to 
delay line DL650 on the Beam 1 Vertical Amplifier (diagram 
9). The differential signal from the beam 2 preamplifiers 
(U3665 or U3765) is coupled to delay line DL2650 on the 
Beam 2 Vertical Amplifier (diagram 1 0). 



Operation of the four preamplifier stages is nearly identi- 
cal; therefore, only the Left Beam 1 Preamplifier U3615 will 
be described. Vertical channel switching of the preamplifier 
stages is described under Beam 1 and Beam 2 Vertical 
Channel switching. The lockout of the beam 2 preamplifiers 
during readout, is described under Readout Inhibit. 



The negative input of the differential vertical signal is ap- 
plied to preamplifier U3615 at pin 13 and the positive input 
is applied at U3615 pin 16. Bias inputs at U3615 pins 11, 
14, 15, and 2 permit the characteristics of the preamplifier to 
be set by external components. For example, R3620-C3620 
provide high-frequency compensation and R3630-C3630, 
R3621-C3621, and R3622-C3622 provide thermal compen- 
sation. The Beam 1 Left Gain adjustment (R3619) matches 
the gain of the left preamplifier to the right preamplifier. 



The output from the preamplifier (U3615) is dependent 
on the level at pin 3. A HI level at pin 3 provides differential 
output at pins 9 and 4 to the Beam 1 Vertical Amplifier. A 
LO level at U3615 pin 3 internally shunts signal flow, thereby 
disabling the integrated circuit. Simultaneously, dc current is 
supplied to U3615 pin 6 from the +15 V supply. Refer to 
the Beam 1 and Beam 2 Vertical Channel Switching discus- 
sions for additional information. 



When the BEAM 1 VERTICAL MODE switch is set to 
LEFT (see diagram 2), the LO level applied to the base of 
Q3748 turns on the transistor. The collector level raises HI, 
as does pin 3 of the Beam 1 Left Preamplifier U3615. This 
HI level turns on U3615, providing differential signal output 
from pins 9 and 4 to the Beam 1 Vertical Amplifier (diagram 
9). Simultaneously, the LO level from the BEAM 1 VERTI- 
CAL MODE switch is coupled through R3744 to pin 3 of the 
Right Beam 1 Preamplifier U3715. The LO level internally 
shunts signal flow, thereby disabling U3715. 



The Beam 2 Channel Switch stage (Q3798) determines 
whether the beeim 2 vertical signal is derived from the plug- 
in unit in the LEFT VERT or RIGHT VERT compartments. 
Operation of the Beam 1 and Beam 2 Channel Switch 
stages is nearly identical; therefore, the Beam 1 Channel 
Switching discussion applies to the Beam 2 Channel Switch 
stage. 



Readout Inhibit 

The vertical signal to the Beam 2 Vertical Amplifier (dia- 
gram 10) is blocked during the time that readout is being 
displayed. The X-Y inhibit signal (HI), from the Readout Sys- 
tem (diagram 17), turns on transistor Q3795. The collector 
of Q3795 drops LO. The LO level is coupled through 
CR3794 and CR3694 to pin 3 of both the Left Beam 2 
Preamplifier (U3665) and the Right Beam 2 Preamplifier 
(U3765). Signal flow is internally shunted in both integrated 
circuits, thereby disabling both the Left (U3665) and Right 
(U3765) Beam 2 Preamplifier stages. After the readout dis- 
play, the X-Y inhibit signal falls LO, which turns off Q3795 
and reverse biases CR3794 and CR3795. Now, the current 
flow through the Beam 2 Left and Right Preamplifiers is 
dependent on the Beam 2 Channel Switch stage. 



Beam 1 Vertical Channel Switch 

The Beam 1 Vertical Channel Switch stage (Q3748) de- 
termines whether the beam 1 vertical signal is derived from 
the plug-in unit in the LEFT VERT or RIGHT VERT 
compartments. 



When the BEAM 1 VERTICAL MODE switch is set to 
RIGHT (see diagram 2) +5 V (HI) is applied to the base of 
Q3748. The HI level turns off Q3748, which drops the collec- 
tor level to ground. The LO level at pin 3 of the Left Beam 1 
Preamplifier U3615 internally shunts signal flow, thereby 
disabling the integrated circuit. Simultaneously, the HI level 
from the BEAM 1 VERTICAL MODE switch is coupled to 
pin 3 of the Right Beam 1 Preamplifier U3715. The HI level 
turns on U3715 providing differential signal output from pins 
9 and 4 to the Beam 1 Vertical Amplifier (diagram 9). 



Dedicated Vertical Interface (Option 21 Only) 

The Dedicated Vertical Interface stage provides 
preamplification for the left vertical signal to the Beam 1 
Vertical Amplifier (diagram 9) and for the right vertical signal 
to the Beam 2 Vertical Amplifier (diagram 1 0). The Readout 
Inhibit stage disables the beam 2 preamplifier during the 
readout display. Figure 3-15 shows a block diagram of the 
Dedicated Vertical Interface and a schematic is shown on 
diagram 8 in the Diagrams section of this manual. 




Vertical Preamplifiers 

Integrated circuit U61 5 preamplifies the left vertical signal 
to the Beam 1 Vertical Amplifier (diagram 9) and U715 
preamplifies the right vertical signal to the Beam 2 Vertical 
Amplifier (diagram 10). 



REV JUN 1981 



3-21 




Theory of Operation — 7844/R7844 Service 



< 3 > 



VERTICAL SIGNAL 
FROM 

LEFT VERTICAL 
UNIT 




X-Y INHIBIT 
FROM 

READOUT SYSTEM 



<«> 



VERTICAL SIGNAL 
FROM 

RIGHT VERTICAL 
UNIT 




<S> 



<$» 




1676-89 



Fig. 3-15. Detailed block diagram of the Dedicated Vertical Interface circuit. 



Operation of the beam 1 and beam 2 preamplifiers (U615 
and U715, respectively) is nearly identical, except that the 
beam 2 vertical signal is locked out during the readout dis- 
play (refer to the Readout Inhibit description, which follows, 
for further information). Therefore, only the Beam 1 
Preamplifier (U615) will be described. 



The negative input of the differential vertical signal is ap- 
plied to preamplifier U615 at pin 13, and the positive input is 
applied at U615 pin 16. Bias inputs at U615 pins 11, 14, 15, 
and 2 permit the characteristics of the preamplifier to be set 
by external components. For example, C618 and R618 pro- 
vide high-frequency compensation, and R606 and C606 pro- 
vide thermal compensation. The differential output from 
U615 is at pins 9 and 4. 



Readout Inhibit 

The vertical signal to the Beam 2 Vertical Amplifier (dia- 
gram 10) is blocked during the time that readout is dis- 
played. The X-Y inhibit signal (HI), from the Readout System 
(diagram 17), turns on Q752, which turns off Q652. The 
resultant HI at U715 pin 10 and LO at U715 pin 3, shunts 
signal flow within the integrated circuit, thereby disabling 
U715. 



After the readout display, the X-Y inhibit signal falls LO. 
Q752 turns off and Q652 turns on. The resultant HI at U715 
pin 3 and LO at pin 1 0, enables signal flow from U71 5 pins 9 
and 4 to the Beam 2 Vertical Amplifier (diagram 10). 



Beam 1 Vertical Amplifier 

The Beam 1 Vertical Amplifier circuit provides final ampli- 
fication for the vertical signal before it is applied to the beam 
1 vertical deflection plates of the crt. An input is provided for 
the BEAM 1 BEAMFINDER switch to compress an over- 
scanned display within the viewing area of the crt. In addi- 
tion, the Beam 1 Vertical Amplifier accepts the Auxiliary Y- 
Axis input from the Main Interface circuit. Figure 3-16 shows 
a block diagram of the Beam 1 Vertical Amplifier and a sche- 
matic is shown on diagram 9 in the Diagrams section of this 
manual. 




Delay Line 

Delay Line DL650 provides approximately 65 ns of delay 
for the vertical signal to allow the horizontal circuits time to 
initiate a sweep before the vertical signal reaches the verti- 
cal deflection plates of the crt. This allows the instrument to 
display the leading edge of the signal originating the trigger 



3-22 



REV JUN 1981 





Theory of Operation — 7844/R7844 Service 




Fig. 3-16. Detailed block diagram of the Beam 1 Vertical Amplifier circuit. 



pulse when using internal triggering. The delay line used in 
this instrument has a characteristic impedance of 1 00 Q dif- 
ferentially. It is of the coaxial type that does not produce 
preshoot or phase distortion in the crt display. 



High-Frequency Amplifier 

The High-Frequency Amplifier stage, consisting primarily 
of integrated circuit U1685, provides a 50 <2 input imped- 
ance (100 $2 differentially) for the Beam 1 Vertical Amplifier 
circuit to permit accurate delay-line termination. The compo- 
nents connecting the input signal to U1685 provide forward 
termination and compensation for the delay line. 
Resistor/capacitor R1658 and Cl 658 provide adjustable 
high-frequency compensation. Terminals to the emitters of 
the input transistors of U1 685 at pins 5,6,11, and 1 2 permit 
the quiescent operating conditions of the stage to be set by 
discrete components. Resistors R1682 and R1689 set the 
quiescent operating level; R1683 and R1687 are selected to 
accurately set the gain of the differential channels. These 
emitter inputs also provide a means of injecting the output 
of the Auxiliary Y-Axis Amplifier stage. The Vert Gain ad- 
justment, R1730, sets the resistance between the output 
terminals of U1685 to control the current gain of this stage. 
This adjustment sets the overall gain of the Beam 1 Vertical 
Amplifier circuit. 



Auxiliary Input Amplifier 

The Beam 1 Auxiliary Input Amplifier controls the bias 
current to the High-Frequency Amplifier stage to provide 
centering for the Beam 1 Vertical Amplifier circuit. The beam 
1 auxiliary Y-axis signal originates either from dual time- 
base units with alternate sweep switching and vertical posi- 
tioning or on command of the VERT SET (1) control. Refer 
to the Auxiliary Y-Axis Switching portion of the Main Inter- 
face discussion (diagram 4) for further information. 



The auxiliary Y-axis signal at J1690 is coupled through 
CR1690 to the base of Q1720. Transistors Q1720 and 
Q1 710 form a paraphase amplifier to convert the single-end- 
ed auxiliary Y-axis input signal to a push-pull signal, which is 
coupled to the bias inputs of U1685 (refer to Fig. 3-16). 



Transistors Q1694, Q1700, and associated circuitry form 
a stage that blocks auxiliary Y-axis signals during the time 
that readout is displayed. However, only the Beam 2 Verti- 
cal Amplifier (diagram 1 0) is time shared with the Readout 
System (diagram 17). Therefore, the beam 1 circuits (Q1694 
and Q1700) are not used. Transistors Q1694 and Q1700 
are quiescently off. 



Output Amplifier 

The Output Amplifier stage, consisting primarily of inte- 
grated circuit U1745, provides final amplification for the ver- 
tical signal to drive the crt beam 1 vertical deflection plates. 
Terminals to the emitters of the input transistors at pins 1 , 
6, 7, and 12 allow the use of discrete components to estab- 
lish operating characteristics. Resistors R1741 and R1756 
are selected to accurately set the gain of the differential 
channels. Resistors R1753, R1754, R1767, R1768, and 
R1770 set the operating level of this stage. The series RC 
networks in psirallel with R1741 and R1756 provide frequen- 
cy compensation for uniform gain at all frequencies within 
the bandwidth of the instrument. 



The BEAM 1 BEAMFINDER switch, changes the emitter 
current source for U1745 to provide the beamfinder func- 
tion. Normally, the emitter current for U1745 is supplied 
from ground. However, when the BEAM 1 BEAMFINDER 
switch is actuated, the only emitter current source for 
U1745 is through R1771. This limits the dynamic range of 
the stage by limiting its current, so the display is com- 
pressed vertically within the graticule area. 



REV JUN 1981 



3-23 




Theory of Operation — 7844/R7844 Service 



The signal at the output collectors of U1745 is connected 
directly to the beam 1 vertical deflection plates of the crt. A 
distributed deflection plate system is used in this instrument 
for maximum frequency response and sensitivity. The signal 
at the output of U1745 is connected to the deflection-plate 
structure in the crt and then to termination network LR1780, 
R1782A, LR1784, and R1782B. As the signal passes 
through the deflection-plate structure in the crt, its velocity 
is essentially the same as the velocity of the electron beam 
passing between the vertical deflection plates. This synchro- 
nism of the deflection signal and the electron beam reduces 
the loss in high-frequency sensitivity due to electon-transit 
time through the deflection-plate structure. 



Beam 2 Vertical Amplifier 

The Beam 2 Vertical Amplifier circuit provides final ampli- 
fication for the vertical signal before it is applied to the beam 
2 vertical deflection plates of the crt. The Beam 2 Vertical 
Amplifier also accepts inputs from the Readout System to 
block the vertical signal while readout information is dis- 
played and to produce the vertical portion of the readout 
display. An input is provided for the BEAM 2 BEAMFINDER 
switch to compress an overscanned display within the view- 
ing area of the crt. In addition, the Beam 2 Vertical Amplifier 




accepts the auxiliary Y-axis input from the Main Interface 
circuit (diagram 4). Figure 3-17 shows a block diagram of 
the Beam 2 Vertical Amplifierand a schematic is shown on 
diagram 10 in the Diagrams section of this manual. 



The Beam 2 Vertical Amplifier contains readout circuitry 
in the Auxiliary Input Amplifier stage (see Fig. 3-17); other- 
wise, operation is identical to the Beam 1 Vertical Amplifier. 
The Beam 2 Vertical Amplifier circuit numbers are in the 
2000-series, whereas, the Beam 1 Vertical Amplifier circuit 
numbers are in the 1000-series. For example, U1685 on the 
Beam 1 Vertical Amplifier (diagram 9) corresponds to U2685 
on the Beam 2 Vertical Amplifier (diagram 10). Therefore, 
the Beam 1 Vertical Amplifier discussion applies to the 
Beam 2 Vertical Amplifier, except for circuit numbers and 
the Auxiliary Input Amplifier discussion. 



Auxiliary Input Amplifier 

The Beam 2 Auxiliary Input Amplifier controls the bias 
current to the High-Frequency Amplifier stage to provide 
centering for the Beam 2 Vertical Amplifier circuit. This 
stage also provides readout and auxiliary inputs to the 
Beam 2 Vertical Amplifier. 



BEAM 2 
VERTICAL 

SIGNAL 

FROM 

VERTICAL 

INTERFACE 

<7>OR<8> 

X-Y 

INHIBIT 

FROM 

READOUT 

SYSTEM 

<7>OR<8><3> 



BEAM 2 

AUXILIARY 

Y-AXIS 

SIGNAL 

FROM 

MAIN 

INTERFACE 



DELAY 

LINE 

DL2650 



DELAY-LINE 
I COMPENSATION! 



HIGH 
FREQUENCY! 
AMPLIFIER 
U2685 



OUTPUT 

AMPLIFIER 

U2745 






Y-READOUT 

SIGNAL 

FROM 

READOUT 

SYSTEM 



AUXILIARY 
INPUT 
AMPLIFIER 
CR2690 Q2710 

Q2694 Q2720 

Q2700 



VERTICAL 

SIGNAL 

TO BEAM 2 

VERTICAL 

DEFLECTION 

PLATES 

OF CRT 



< 8 > 



BEAM 2 
jBEAMFINDER 



<$> 



<$> 



1676-94 



Fig. 3-17. Detailed block diagram of the Beam 2 Vertical Amplifier circuit. 



3-24 



REV JUN 1981 





The beam 2 auxiliary Y-axis signal originates from dual 
time-base units with alternate sweep switching and vertical 
positioning. Refer to the Auxiliary Y-Axis Switching portion 
of the Main Interface discussion (diagram 4) for further 
information. 



When Readout is not displayed, Q2694 and Q2700 are 
off. The auxiliary Y-axis signal at J2690 is coupled through 
CR2690 to the base of Q2720. Transistors Q2720 and 
Q2710 form a paraphase amplifier to convert the single-end- 
ed auxiliary Y-axis input signal to a push-pull signal, which is 
coupled to the bias inputs of U2685 (refer to Fig. 3-17). 



When readout is displayed, the X-Y inhibit signal (HI) at 
J2738 turns on Q2694. The collector of Q2694 drops, which 
reverse biases CR2690 and turns on Q2700. The auxiliary 
Y-axis signal at J2690 is blocked and the Y-readout signal 
at J2799 is coupled to the base of Q2720. Transistors 
Q2720 and Q2710 form a paraphase amplifier to convert 
the single-ended Y-readout input signal to a push-pull signal 
that is coupled to the bias inputs of U2685 (refer to Fig. 
3-17). When Q2700 is on, Readout Centering adjustment 
R2700 provides vertical centering of the readout display. 



Theory of Operation — 7844/R7844 Service 

Horizontal Interface 

The Horizontal Interface circuit determines whether the 
Left or Right Horizontal unit provides the input signal to the 
Beam 1 and Beam 2 Horizontal Amplifiers as selected by 
the HORIZONTAL MODE switch (diagram 2). Figure 3-18 
shows a block diagram of the Horizontal Interface circuit. A 
schematic of the Horizontal Interface circuit is shown on 
diagram 1 1 in the Diagrams section of this manual. 




Beam 1 Channel Switch 

The Beam 1 Channel Switch stage (U820) determines 
whether the beam 1 horizontal signal is derived from the 
plug-in unit in the A or B HORIZ compartment. 



The BEAM 1 HORIZONTAL MODE switch sets the GND 
A1 line HI or LO (see diagram 2). A HI at pin BA causes the 
Beam 1 Channel Switch to route the push-pull signal from 
the B Horizontal plug-in unit to J820 and J810. A LO at pin 
BA causes the Beam 1 Channel Switch to route the push- 
pull signal from the A Horizontal plug-in unit to J820 and 
J810. 



BEAM 1 
HORIZONTAL 
MODE 
SWITCHING 






SIGNAL 
FROM A 
HORIZONTAL 
UNIT 



❖ 



BEAM 1 
CHANNEL 
SWITCH 
U820 



SIGNAL 
FROM B 
HORIZONTAL 
UNIT 






BEAM 2 
CHANNEL 
SWITCH 
U840 



BEAM 2 

HORIZONTAL MODE 
SWITCHING 



< 3 > 



X-Y INHIBIT 
FROM READOUT 
SYSTEM 



< 8 > 



HORIZONTAL 
SIGNAL TO 
BEAM 1 
HORIZONTAL 
AMPLIFIER 




HORIZONTAL 
SIGNAL TO 
BEAM 2 
HORIZONTAL 
AMPLIFIER 





1676-90 



Fig. 3-18. Detailed block diagram of the Horizontal Interface circuit. 



REV JUN 1981 



3-25 









Theory of Operation — 7844/R7844 Service 



Beam 2 Channel Switch 

The Beam 2 Channel Switch stage (U840) determines 
whether the beam 2 horizontal signal is derived from the 
plug-in unit in the A or B IHORIZ compartment. 



The BEAM 2 HORIZONTAL MODE switch sets the GND 
B2 line HI or LO (see diagram 2). A HI at pin BB causes the 
Beam 2 Channel Switch to route the push-pull signal from 
the A Horizontal plug-in unit to J841 and J850. A LO at pin 
BB causes the Beam 2 Channel Switch to route the push- 
pull signal from the B Horizontal plug-in unit to J841 and 
J850. 



The X-Y inhibit signal (HI) prevents the Beam 2 Channel 
Switch from coupling signals from either horizontal plug-in 
unit to the Beam 2 Horizontal Amplifier (diagram 1 3) during 
the readout display. A HI at J838A sets the Beam 2 Channel 
Switch (U840) to the lockout mode. 



Beam 1 Horizontal Amplifier 

(For instruments 7844 SN BllOOOO-above; R7844 
SN BlOOOOO-above). 

The Beam 1 Horizontal Amplifier circuit amplifies the 
push-pull horizontal deflection signal from the plug-in unit 
installed in either horizontal compartment and connects it to 
the beam 1 horizontal deflection plates of the crt. Figure 
3-19 shows a detailed block diagram of the Beam 1 Hori- 
zontal Amplifier circuit. A schematic of this circuit is shown 
on diagram 12 in the Diagrams section of this manual. 



Input Amplifier 

The Input Amplifier stage is a paraphase amplifier con- 
sisting of Q4812 and Q4814. Overall gain for the Horizontal 
Amplifier is determined by Horiz Gain adjustment R4820. 
Thermal compensation for the horizontal system is provided 
by thermistor network RT4824 and R4824. The Horiz Sep 
signal at J4868 adds offset current to the base of Q4812 




left ^ 

□ RIVER 
AMPLIFIER 
Q4854 
Q4858 . 



LEFT \ 

output\ 

AMPLIFIER 

Q4888 

Q4890 

Q4896 ^ 

Q4892 / 



TO LEFT 
■ HORIZONTAL 
DEFLECTION 
PLATE 



BEAM 1 
HORIZONTAL 
SIGNAL FROM 
HORIZONTAL 
INTERFACE 



INPUT 

AMPLIFIER 

Q4812 

Q4814 



BEAMFINDER 

NETWORK 

Q4828 

Q4835 



HORIZONTAL 

SEPARATION 

SIGNAL 

FROM 

<£><£ 



RIGHT ^ 
DRIVER 
AMPLIFIER 
Q4844 

04848 ^ 



RIGHT ^N. 
OUTPUT ^ 
AMPLIFIER 
Q4868 
Q4870 

Q4872 ^ 

Q4876 y' 



TO RIGHT 
HORIZONTAL 
DEFLECTION 
PLATE 



8EAM FINDER 



<e> <$><$> 



( 1676 - 177 ) 1676-195 



Fig. 3-19. Detailed block diagram of the Beam 1 Horizontal Amplifier circuit (for instruments 7844 SN B1 10000-above; R7844 
SN BlOOOOO-above). 



3-26 



REV JUN 1981 





Theory of Operation — 7844/R7844 Service 



through R481 0. This occurs when the same horizontal plug- 
in compartment is selected by the BEAM 1 and BEAM 2 
HORIZONTAL MODE switches. The Horiz Ctr adjustment, 
R4816, compensates for centering error in the crt, channel 
switch, and input amplifier circuit. Capacitor C4823 in- 
creases the gain of the input stage at high frequency, and 
provides adjustment for the 1 ns/div timing. 



The Input Amplifier emitter current source is normally 
supplied from the +15 V Supply through saturated Q4828 
and R4825 and R4826. Transistor Q4835 is turned off by 
the saturation voltage of Q4828. When the BEAMFINDER 
switch is actuated, Q4828 is reverse biased, and emitter 
current to Q4812 and Q4814 is supplied through R4827. 
This reduces the dynamic range of the input stage by limit- 
ing its current source. Transistor Q4835 is forward biased 
and supplies the required current to the Driver and Output 
Amplifiers. This action reduces the dynamic range of the 
horizontal system to keep the display within the horizontal 
limits of the graticule, regardless of the setting of positioning 
controls or signal amplitude. 



Left and Right Driver Amplifiers 

The Left and Right Driver Amplifiers are current-driven, 
shunt-feedback amplifiers, consisting of Q4844 and Q4854, 
and feedback resistors R4845 and R4855. Transistors 
Q4848 and Q4858 are emitter followers that provide the 
current source for the shunt-feedback amplifiers Q4844 and 
Q4854; they also drive the capacitive load that is presented 
by the output stage. The LIM CTR adjustment, R4840, pro- 
vides offset current to the driver amplifiers, so when equal 
current exists in both amplifiers, no differential voltage will 
be applied to the output amplifiers; this effectively provides 
a centered trace presentation. 



Beam 1 Horizontal Amplifier 

(For instruments 7844 SN B109999-below; R7844 
SN B099999-below) 

Input Amplifier 

The Beam 1 Horizontal Amplifier circuit amplifies the 
push-pull horizontal deflection signal from the plug-in unit 
installed in either horizontal compartment and connects it to 
the beam 1 horizontal deflection plates of the crt. Figure 3- 
20 shows a detailed block diagram of the Beam 1 Horizontal 
Amplifier circuit. A schematic of this circuit is shown on dia- 
gram 12 in the Diagrams section of this manual. 




The Input Amplifier stage is a paraphase amplifier con- 
sisting of Q181 4 and Q1812. Overall gain for the Horizontal 
Amplifier is determined by Horiz Gain adjustment R1816. 
Thermal compensation for the horizontal amplifier is pro- 
vided within this stage by thermistor RT1814. The emitter 
current for this stage is normally supplied from the +15 V 
Supply through R1828 and Q1826. However, when the 
BEAMFINDER switch is actuated, Q1826 is reverse biased, 
and emitter current to Q1814 and Q1812 is supplied only 
through R1826. Transistor Q1828 is then forward biased, 
which causes CR1834 and CR1836 to conduct. The combi- 
nation of Q1825 turning off and Q1828 turning on reduces 
the dynamic range of the horizontal system to keep the dis- 
play within the horizontal limits of the graticule, regardless 
of the setting of positioning controls or signal amplitude. 
The Horiz Sep signal at J1868 adds offset current to the 
base of Q1812 through R1810. This occurs when the same 
horizontal plug-in compartment is selected by the BEAM 1 
and BEAM 2 HORIZONTAL MODE switches. 



Left Output Amplifier 

The Left Output Amplifier is an operational amplifier con- 
sisting of common-emitter amplifiers Q4888 and Q4890, 
and the common-base amplifier Q4896. The feedback net- 
work is R4898-C4898 and R4862, C4860, and C4861 
(R4862 is R. and R4898 is R ( ). Variable capacitor C4860 
adjusts for the 2 and 5 ns/div timing. Transistor Q4892 pro- 
vides the collector current source for the output amplifier, 
Q4896. 



Left and Right Driver Amplifiers 

The Left and Right Driver Amplifiers each consist of an 
operational amplifier to drive their respective output amplifi- 
er stages. Transistors Q1854 and Q1858 compose the 
operational amplifier for the Left Driver Amplifier. Transis- 
tors Q1844 and Q1848 compose the operational amplifier 
for the Right Driver Amplifier. The Symmetry adjustment, 
R1838, sets the quiescent operating level of the driver am- 
plifiers and output amplifiers. 



Right Output Amplifier 

Basic operation of the Right Output Amplifier is similar as 
just described for the Left Output Amplifier. However, 
04876, in addition to serving as a collector current source 
for the output amplifier Q4872, is also the high-frequency 
signal path from the collectors of Q4868 and Q4870 to the 
crt plates. 



To prevent the Left Output Amplifier from being 
overdriven, signal limiting occurs in the Left Driver Amplifier. 
Signal limiting occurs when the collector of Q1858 is driven 
far enough in the negative direction for CR1852 to become 
forward biased. As CR1852 conducts, R1852 is connected 
in parallel with R1854; this effectively reduces the gain of 
the stage and in turn the signal drive to the Left Output 
Amplifier. 



REV JUN 1981 



3-27 




Theory of Operation — 7844/R7844 Service 



LEFT X 

DRIVER 

AMPLIFIER 



LEFT \ 
OUTPUT X 
AMPLIFIER 

Q1934 Q1870 
Q1926 / 

Q1920 



TO LEFT 
- HORIZONTAL 
DEFLECTION 
PLATE 



BEAM I 
HORIZONTAL 
SIGNAL FROM 
HORIZONTAL 
INTERFACE 



INPUT 

AMPLIFIER 



BEAMFINDER 

NETWORK 



HORIZONTAL 
SEPARATION 
SIGNAL FROM 

< 3 > <$> 



RIGHT X. 

DRIVER 

AMPLIFIER 



RIGHT XI 

OUTPUT X. 
AMPLIFIER 
Q1904 Q1860 
Q1902 . 

Q1896 
Q1894 



TO RIGHT 
• HORIZONTAL 
DEFLECTION 
PLATE 



BEAMFINDER 



< 5 > <S> <3> 



Fig. 3-20. Detailed block diagram of the Beam 1 Horizontal Amplifier circuit (for instruments 7844 SN B109999-below; R7844 
SN B099999-below). 



Similarly, to prevent the Right Output Amplifier from be- 
ing overdriven, signal limiting occurs in the Right Driver 
stage. Signal limiting occurs when the collector of Q1848 is 
driven far enough in the positive direction for CR1842 to 
become forward biased. As CR1842 conducts, R1844 is 
connected in parallel with R1842, which effectively reduces 
the gain of the stage; in turn, the drive to the Right Output 
Amplifier. 



Left Output Amplifier 

The Left Output Amplifier consists of Q1870, Q1934, 
Q1926, and Q1920. Low-frequency signals at the emitter of 
Q1870 are amplified by Q1934 and Q1926. The feedback 
network for the low-frequency amplifier is R1928-C1928 
and R1936-C1934 (R1936 is R, and R1938 is R f ). Variable 
capacitor Cl 934 adjusts the high-frequency signal gain of 
the low-frequency amplifier. Transistor Q1870 operates as 
an emitter-follower for low-frequency signals and a com- 



mon-emitter amplifier for high-frequency signals. The gain of 
Q1870 for high-frequency signals is determined by the set- 
ting of Cl 862 and R1870. High-frequency signals at the col- 
lector of Q1870 are coupled to common-base amplifier 
Q1926 by Cl 870 and to Q1920 through Cl 920. The output 
transistors Q1926 and Q1920 are connected in the comple- 
mentary configuration to provide less resistive loading at the 
output. Horiz Ctr adjustment R1940 balances the output 
stages to horizontally center the beam 1 crt display. 



Right Output Amplifier. 

Basic operation of the Right Output Amplifier is the same 
as just described for the Left Output Amplifier. 

1 ns Boost 

The 1 ns Boost stage is activated at the fastest calibrat- 
ed sweep rate of 1 ns. Components Cl 860 and R1864 com- 



3-28 



REV JUN 1981 






Theory of Operation — 7844/R7844 Service 



pose a differentiator. High-frequency signals from Q1860 
are coupled through Cl 860 to the emitter of Q1 864 causing 
Q1864 to conduct and boost the signal at the collector of 
Q1870. Likewise, Cl 874 couples high-frequency signals to 
the emitter of Q1874 causing Q1874 to conduct and boost 
the signal at the emitter of Q1 896. 



Beam 2 Horizontal Amplifier 

(For instruments 7844 SN B1 10000-above; R7844 
SN BlOOOOO-above). 

The Beam 2 Horizontal Amplifier circuit amplifies the 
push-pull horizontal deflection signal from the plug-in unit 
installed in either horizontal compartment and connects it to 
the beam 2 horizontal deflection plates of the crt. Figure 
3-21 shows a detailed block diagram of the Beam 2 Hori- 
zontal Amplifier circuit. A schematic of this circuit is shown 
on diagram 13 in the Diagrams section of this manual. 




The Beam 2 Horizontal Amplifier and Beam 1 Horizontal 
Amplifier are identical except for readout circuitry contained 
within the Bearn 2 Horizontal Amplifier. Also, the Beam 2 
Horizontal Amplifier component numbers are in the 5000- 
series whereas the Beam 1 Horizontal Amplifier component 
numbers are in the 4000-series. For example, Q4812 on 
diagram 12 corresponds to Q5812 on diagram 13. There- 
fore, the Beam 1 Horizontal Amplifier discussion applies to 
the Beam 2 Horizontal Amplifier with the exceptions of com- 
ponent numbers and readout circuitry. 



Readout Positioning 

When readout is displayed, the X-Axis Readout signal is 
applied to the EJeam 2 Horizontal Amplifier through R5809 
(RO Gain). The Readout Gain adjustment, R5809, deter- 
mines the horizontal deflection of the readout display. At the 
same time, the X-Y Inhibit signal (HI) causes Q5808 to con- 
duct, connecting the center tap of Readout Centering ad- 



left \ 

DRIVER 

AMPLIFIER 

Q5854 

Q5858 / 



LEFT \ 

OUTPUTV 

AMPLIFIER 

Q5868 

Q5890 

Q5896 

Q5892 / 



TO LEFT 
HORIZONTAL 
DEFLECTION 
PLATE 



BEAM 2 
HORIZONTAL 
SIGNAL 
FROM 

HORIZONTAL 

INTERFACE 



1 


INPUT 


^ 1 BEAMFINDER 1 


READOUT 


AMPLIFIER NETWORK 


POSITIONING 


Q5812 


/ Q5828 







Q5814 


Q5835 





X-V -i 
INHIBIT 
SIGNAL 



READOUT READOUT 
SIGNAL GAIN 
R5809 



RIGHT >> 
DRIVER 
AMPLIFIER 
05844 

Q5848 ^ 



RIGHTS. 
OUTPUT ^ 
AMPLIFIER 
05668 
Q5870 

Q5872 / 

05876 ^/ 



-TO RIGHT 
HORIZONTAL 
DEFLECTION 
PLATE 



| BEAMFINDER | |- - 

<*><*><*> 



( 1676 - 178 ) 1676-196 



Fig. 3-21. Detailed block diagram of the Beam 2 Horizontal Amplifier circuit (for instruments 7844 SN B1 10000-above- R7844 
SN BlOOOOO-above). ’ 



REV JUN 1981 



3-29 




Theory of Operation — 7844/R7844 Service 



justment R5804 to ground. Grounding the center tap of 
R5804 allows R5804 to horizontally position the readout 
display on the crt. 



Beam 2 Horizontal Amplifier 

(For instruments 7844 SN B109999-below; R7844 
SN B099999-below). 

The Beam 2 Horizontal Amplifier circuit amplifies the 
push-pull horizontal deflection signal from the plug-in unit 
installed in either horizontal compartment and connects it to 
the beam 2 horizontal deflection plates of the crt. Figure 
3-22 shows a detailed block diagram of the Beam 2 Hori- 
zontal Amplifier circuit. A schematic of this circuit is shown 
on diagram 13 in the Diagrams section of this manual. 




The Beam 2 Horizontal Amplifier and Beam 1 Horizontal 
Amplifier are identical except for readout circuitry contained 



within the Beam 2 Horizontal Amplifier. Also, the Beam 2 
Horizontal Amplifier component numbers are in the 2000- 
series whereas the Beam 1 Horizontal Amplifier component 
numbers are in the 1000-series. For example, Q1814 on 
diagram 12 corresponds to Q2814 on diagram 13. There- 
fore, the Beam 1 Horizontal Amplifier discussion applies to 
the Beam 2 Horizontal Amplifier with the exceptions of com- 
ponent numbers and readout circuitry. 



Readout Positioning 

When readout is displayed, the X-Axis Readout signal is 
applied to the Beam 2 Horizontal Amplifier through R2809 
(RO Gain). The Readout gain adjustment, R2809, deter- 
mines the horizontal deflection of the readout display. At the 
same time, the X-Y Inhibit signal (HI) causes Q2808 to con- 
duct, connecting the center tap of Readout Centering ad- 
justment R2804 to ground. Grounding the center tap of 
R2804 allows R2804 to horizontally position the readout 
display on the crt. 



BEAM 2 
HORIZONTAL 
SIGNAL 
FROM 

HORIZONTAL 

INTERFACE 




O 



I READOUT 
1 POSITIONING 



FROM 
READOUT 
SYSTEM 






X-Y - 1 

INHIBIT 

SIGNAL 




X ^ 


AAA. i 


READOUT 

SIGNAL 


vvv » 

READOUT 

GAIN 

R2809 




TO LEFT 
HORIZONTAL 
DEFLECTION 
PLATE 



<$> 



| BEAMFINDER 
NETWORK 
Q2826 
Q2828 




TO RIGHT 
HORIZONTAL 
DEFLECTION 
PLATE 






BEAMFINDER 



<*> < 3 > <£> 



]l~- - 



( 1676 - 92 ) 1676-194 



Fig. 3-22. Detailed block diagram of the Beam 2 Horizontal Amplifier circuit (for instruments 7844 SN B109999-below; R7844 
SN B099999-below). 



3-30 



REV JUIM 1981 





Theory of Operation — 7844/R7844 Service 



Z-Axis Amplifiers 

The Beam 1 and Beam 2 Z-Axis Amplifier circuits provide 
the drive signals that control the crt intensity. The Beam 2 
Z-Axis Amplifier is used for the readout display. Otherwise, 
the Beam 1 and Beam 2 Z-Axis Amplifiers are identical. 
Therefore, only the Beam 2 Z-Axis Amplifier will be dis- 
cussed. A schematic of the Z-Axis Amplifier circuits is given 
on diagram 14 in the Diagrams section of this manual. 




U2315. The applied voltage to the input of U2315 from the 
high-voltage secondary of T1310 is approximately 3 kV 
peak to peak. This results in an output voltage of approxi- 
mately +21 kV dc at the crt anode. The Beam 1 Sense 
output of U2315 is fed back to the Converter/Rectifiers and 
Logic circuits to limit the crt beam current if it exceeds a 
safe level. 



Transistors Q2008 and Q2018 are common-base amplifi- 
ers providing a low input impedance for signals from the Z- 
Readout (J2032) and Beam 2 Z-Axis (J2072) lines. 
Transistors Q2022, Q2026, Q2036, Q2032, Q2040, and 
Q2050 compose a current-driven inverting operational 
amplifier. 



Quiescently, the output level at TP2086 is near 10 V; as 
the input signal applied to R2020 goes negative, current in- 
creases through Q2022. The base of Q2032 is pulled posi- 
tive to reduce the current flow through Q2032 and Q2040. A 
reduction of this current causes the output voltage at 
TP2086 to go more positive. The Z-Axis Amplifier is com- 
pensated by C2072, C2062, C2068, and R2068 to provide a 
fast-rising pulse with optimum square corner. Varicap 
CR2064 provides high-frequency compensation for large 
changes in the output voltage. Transistor Q2026 couples 
high-frequency segments of the signal through C2028 to the 
emitter of Q2032 to improve square-wave response. 

Power Transformer 

Power Transformer T1310 provides semi-regulated 
voltages for both the beam 1 and beam 2 heaters and high- 
voltage supply. One secondary winding of T1310 provides 
6.3 V for the crt heaters. The crt heaters are elevated to the 
cathode potential through R231 8. The high-voltage winding 
of T1 31 0 provides a 3 kV peak-to-peak square-wave volt- 
age to the Anode Voltage Multiplier, Beam 1 and Beam 2 
CRT Cathode supplies, Beam 1 and Beam 2 Control Grid 
DC Restorer circuits, and Beam 1 and Beam 2 Focus-Grid 
DC Restorer circuits. One end of the high-voltage winding is 
connected to ground through current-sensing resistor 
R2307. 




The CRT Circuit provides the high voltage and control 
circuits necessary for operation of the cathode-ray tube 
(crt). This circuit also includes the auto-focus amplifiers. Fig- 
ure 3-23 shows a detailed block diagram of the CRT Circuit. 
A schematic of this circuit is shown on diagram 15 in the 
Diagrams section of this manual. 

Anode Voltage Multiplier 

Positive accelerating potential for the crt anode is sup- 
plied by the 14 -times voltage multiplier contained within 



CRT Cathode Supply 

The negative 2.96 kV accelerating potential for the crt 
cathode is generated by a voltage doubler consisting of 
CR2306, CR2312, C2302, C2311, and C2312. High-fre- 
quency filtering is accomplished by R2310, C2308, R2312, 
and C2306. Filter combination R231 0 and C2308 also pro- 
vide an ac path for error correction from the Cathode Supply 
Regulator. 



Cathode Supply Regulator 

The Cathode Supply Regulator maintains the potential 
on the crt cathode and reduces the ac ripple from the CRT 
Cathode Supply. A sample of the output of the CRT Cath- 
ode Supply is connected to the Cathode Supply Regulator 
stage through divider resistors R2303B and R2303A. High- 
frequency changes from the CRT Cathode Supply are coup- 
led to the Cathode Supply Regulator through C2304 and 
R2304. 



The Cathode Supply Regulator consists of a non-invert- 
ing preamplifier, U1635, and an inverting output amplifier, 
Q1627 and Q1631. The +50 V Supply, connected to 
R2303A, and the ground connected to pin 2 of U1 635 
through R1637 provide the reference for error amplifier 
U1635. Transistors Q1627 and Q1631 are connected as a 
collector-coupled, complementary amplifier driven by U1635 
to provide error correction to the CRT Cathode Supply. 



Regulation occurs as follows: If the crt cathode voltage 
becomes less negative, a positive-going change is coupled 
to the input of U1635 at pin 3 and results in a positive-going 
output at pin 6. This positive-going change is inverted by 
Q1 627 and Q1 631 . The negative-going change at the collec- 
tors of Q1627 and Q1631 results in a voltage increase 
across C2302 during the positive half cycle of the high-volt- 
age winding (T I310). (Note that the voltage across C2302 is 
the difference between the positive voltage on T1310 and 
the voltage at TP1625.) During the negative half cycle, the 
increased voltage across C2302 increases the output volt- 
age of the CRT Cathode Supply to correct the original error. 
High-frequency correction signals from the Cathode Supply 
Regulator are ac coupled to the crt cathode through C2308. 
Short-circuit protection for the Cathode Supply Regulator is 
provided by CR1625, CR1631, and CR1639. 



REV JUN 1981 



3-31 




Theory of Operation — 7844/R7844 Service 



BEAM CURRENT SENSE 
(I SENSE) TO 

CONVERTER/RECTIFIERS 



POWER 

TRANSFORMER 

T1310 



CRT CATHODE 
SUPPLY 

CR2306 CR2312 



ANODE 

VOLTAGE 

MULTIPLIER 

U2315 



V2425 

CATHODE-RAY 

TUBE 



TRACE 
■ ROTATION 



TO CRT 
HEATERS 



CATHODE SUPPLY 
- REGULATOR 
U1635, Q1627, Q1631 



X-Y * 
INHIBIT . 



READOUT 

INTENSITY 



R2493 f 
BEAM 2 X, 
FOCUS 
GAIN < 



BEEAM 2 
AUTO FOCUS 
AMPLIFIER 
Q2494 Q2495 
Q2486 Q2488 
Q2480 Q2490 



R2463 > 
BEAM 1 JV 
FOCUS O’ 
GAIN 1 



BEAM 1 
AUTO FOCUS 
AMPLIFIER 
Q2464 Q2456 
Q2458 Q2450 
Q2460 



R2484 
' BEAM 2 
OUTPUT 
LEVEL 



R2436 
r BEAM 2 
FOCUS RESET 



R2568 
BEAM 1 ! 
BOWING , 



BEAM 2 
FOCUS GRID 
DC RESTORER 
CR2352 CR2353 
CR2354 CR2355 



t BEAM 1 

[focus | 

R2416 
^ BEAM 1 
< FOCUS PRESET 



R2572 
BEAM 2 
BOWING 



. R2552 

* BEAM 2 
” VERT SHIELD 



* R2556 

' BEAM 1 
' VERT SHIELD 



R2454 
BEAM 1 
OUTPUT 
LEVEL 



BEAM 1 
FOCUS GRID 
DC RESTORER 
CR2342 CR2343 
CR2344 CR2345 



R1180 , 

BEAM 1 . 

GRID BIAS ' 






BEAM 1 
Z-AXIS 
SIGNAL ‘ 



BEAM 1 

CONTROL GRID 
DC RESTORER 
CR2332 CR2333 
CR2334 CR2335 



R2080 
BEAM 2 
GRID BIAS 



BEAM 2 
Z-AXIS 
SIGNAL 



BEAM 2 

CONTROL GRID 
DC RESTORER 
CR2322 CR2323 
CR2324 CR2325 




3-32 



REV JUN 1981 





Theory of Operation — 7844/R7844 Service 



Control Grid DC Restorer Circuits. 

The Beam 1 and Beam 2 Control Grid DC Restorer cir- 
cuits couple dc and low-frequency components of the Z- 
Axis Amplifier signal to the beam 1 and beam 2 crt control 
grids. This allows the Z-Axis Amplifier circuits to control the 
crt beam current (intensity). The potential difference be- 
tween the Z-Axis Amplifier outputs and the control grids 
(approximately 3000 V) prohibits direct coupling. 



The dc restorer circuits are cathode-referenced bias sup- 
plies for the beam 1 and beam 2 crt control grids. Quies- 
cently, the dc restorer output voltage is more negative than 
the cathode by an amount set by the crt grid bias adjust- 
ments. The Beam 2 Control Grid DC Restorer circuit is cur- 
rent driven from the high-voltage winding of T1310 through 
R2320, R2321 , R2322, and R2323. This drive signal is an 
approximately 25 kHz signal connected to the junction of 
CR2322, CR2323, and CR2324. Diodes CR2322 and 
CR2323 limit the peak-to-peak amplitude of the drive at 
their junction to the difference between their forward-bias 
levels. Beam 2 CRT Grid Bias adjustment R2080 and the 
output level of the Z-Axis Amplifier set the forward-bias lev- 
els of CR2322 and CR2.323, respectively. Capacitor C2324 
couples the limited-amplitude drive to the junction of 
CR2324, CR2325. During positive half cycles of the drive, 
CR2325 clamps the cathode of CR2324 to the level of the 
crt cathode ( - 2960 V). This provides the reference level for 
the Control Grid DC Restorer stage. During negative half 
cycles of the drive signal, CR2323 charges the control grid 
side of C2323 to a level more negative than the crt cathode. 
The resulting control grid voltage is more negative than the 
cathode by an amount equal to the difference between the 
CRT Grid Bias adjustment setting (R2080) and the Beam 2 
Z-Axis Amplifier output level. Neon bulbs DS2327, DS2326, 
DS2400, and DS2401 provide protection for the dc restorer 
diodes. 



The Beam 1 Control Grid DC Restorer circuit includes 
active components CR2332, CR2333, CR2334, CR2335, 
and Grid Bias adjustment R1180. Neon bulbs DS2336, 
DS2337, DS2402, and DS2403 provide protection for the 
dc restorer diodes. The beam 1 circuitry is essentially the 
same as the beam 2 circuitry. Refer to the Beam 2 Control 
Grid DC Restorer discussion in the previous paragraph for 
circuit operation. 



Focus Grid DC Restorer Circuits 

The Beam 1 and Beam 2 Focus Grid Restorer circuits 
couple dc and low-frequency components of the Auto Focus 
Amplifier circuits to the crt focus grids. This allows the Auto 
Focus Amplifiers to control the focus grid potentials. The 
potential difference between the Auto Focus Amplifier out- 
puts and the focus grids (approximately 3000 V) prohibits 
direct coupling. 



The dc restorer circuits are bias supplies for the beam 1 
and beam 2 focus grids. The outputs of these stages are 
referenced to the levels set by the focus adjustments. Qui- 
escently, the focus grid voltage is more negative than the 
reference level by 10 V. 



The Beam 2 Focus Grid DC Restorer is current driven 
from the high-voltage winding of T1310 through R2330, 
R2331, R2352, and R2353. This drive signal is an approxi- 
mately 25 kHz signal connected to the junction of CR2352, 
CR2353, and C2352. Diodes CR2352 and CR2353 limit the 
peak-to-peak amplitude of the drive at their junction to the 
difference between their forward-bias levels. The + 130V 
Supply and the output level of the Auto Focus Amplifier set 
the forward-bieis levels of CR2352 and CR2353. Capacitor 
C2352 couples the limited-amplitude drive to the junction of 
CR2354 and CR2355. During positive half cycles of the 
drive, CR2355 clamps the cathode of CR2355 to the level 
set by the Beam 2 Focus adjustment, R2436. This provides 
the reference level for the Beam 2 Focus Grid Dc Restorer 
stage. During negative half cycles of the drive, CR2354 
charges the focus-grid side of C2353 to a level more nega- 
tive than the reference level. The resulting focus-grid voltage 
is more negative than the reference level by an amount 
equal to the difference between the + 1 30 V Supply and the 
Beam 2 Auto Focus Amplifier output level. 



The Beam 1 Focus Grid DC Restorer circuit includes ac- 
tive components CR2342, CR2343, CR2344, CR2345, and 
Beam 1 Focus adjustment R2416. The beam 1 circuitry is 
essentially the same as the beam 2 circuitry. Refer to the 
Beam 2 Focus Grid DC Restorer discussion in the previous 
paragraph for circuit operation. 



Auto Focus Stages 

The Beam 1 and Beam 2 Auto Focus Amplifier stages 
provide control voltages to maintain optimum focus of the 
crt display. When the focus controls are set for best defini- 
tion of the crt display at low to medium settings of the inten- 
sity controls, these stages maintain optimum focus for all 
portions of display. 



Transistors Q2494 and Q2495 select current from either 
the BEAM 2 INTENSITY control or the READOUT INTEN- 
SITY control to drive the Beam 2 Auto Focus Amplifier. 



When the X-Y inhibit signal at the base of Q2495 is low, 
Q2495 is off ar,d Q2494 conducts current (determined by 
the BEAM 2 INTENSITY control) to the Beam 2 Auto Focus 
Amplifier. When the X-Y inhibit signal at the base of Q2495 
is high, Q2495 turns on and Q2494 turns off. Transistor 
Q2495 conducts current (determined by the setting of the 
READOUT INTENSITY control) to the Beam 2 Auto Focus 
Amplifier. 



REV JUN 1981 



3-33 




Theory of Operation — 7844/R7844 Service 



The Beam 2 Auto Focus Amplifier includes Q2488, 
Q2486, Q2480, and Q2490 connected as a non-inverting 
operational amplifier to drive the focus-grid electrode of the 
crt. Resistor R2493 determines the amount of drive signal to 
the base of Q2488 to set the overall gain of the Beam 2 
Auto Focus Amplifier. Beam 2 Output Level adjustment 
R2484 determines the output level of this stage. 



Transistor Q2464 conducts current (determined by the 
setting of the BEAM 1 INTENSITY control) to the Beam 1 
Auto Focus Amplifier. The Beam 1 Auto Focus Amplifier 
includes Q2458, Q2456, Q2450, and Q2460 connected as a 
non-inverting operational amplifier to the beam 1 focus grid 
of the crt. Resistor R2463 determines the amount of drive 
signal to the base of Q2458 to set the overall gain of the 
Beam 1 Auto Focus Amplifier. Beam 1 Output Level adjust- 
ment R2454 determines the output level of this stage. 



CRT Control Circuits 

Separate crt adjustments are provided for display char- 
acteristics of beam 1 and beam 2. However, TRACE ROTA- 
TION adjustment R980 controls the current through L2425, 
which affects both vertical and horizontal rotation of both crt 
beams. Y-Axis adjustment R386 controls the current 
through L2426, which affects only the vertical rotation of 
both beams. 



Output Signals 

The Signals Out circuit board provides signals to the 
rear-panel connectors. External input signals, applied to the 
rear-panel connectors, are coupled through the Signals Out 
board to other circuits within the instrument. The schematic 
for these circuits is shown on diagram 16 in the Diagrams 
section of this manual. 




A GATE Output (Main and Delayed) 

The A GATE signal is derived from the time-base unit 
installed in the A HORIZ compartment. Gate Selector switch 
(SI 004) selects between MAIN and DLY'D sweep gates. 
However, if a delay gate signal is not furnished from the A 
HORIZ compartment, the output from the A GATE connec- 
tor, (when SI 004 is set to DLY’D) will be a positive dc level. 



Transistors Q1010 and Q1012 comprise a comparator 
circuit, with the reference voltage determined by R1004 and 
R1006. When Gate Selector switch SI 004 is set to MAIN, 
the positive-going signal will turn Q1010 on and Q1 01 2 off. 
The collector of Q1 01 2 then will rise to a positive level set by 
the divider network R1018, CR1018, R1019 and the 
emitter-base junction of Q1018. The positive level at the 
collector of Q1012 turns Q1018 on, producing a positive 
level at the collector of Q1018. The current flowing through 
Q1018 is limited by R1013. When SI 004 is set to DLY’D, 



the negative-going gate signal turns Q1 01 2 off. Then Q1018 
turns on and a positive level is produced at the collector of 
Q1018. 



B GATE Output (IMIain and Delayed) 

The B GATE circuitry operates the same as the A GATE 
circuitry except that the MAIN and DLY’D gate signals origi- 
nate from the timei-base unit installed in the B HORIZ plug-in 
compartment. 



A SAWTOOTH Output 

The A SAWTOOTH output connector provides a 
sawtooth signal that originates from the time-base unit in- 
stalled in the A HORIZ plug-in compartment. The negative- 
going sawtooth signal from the A time-base unit increases 
the current through Q1040, which, in turn, increases the cur- 
rent through Q1046. The current through Q1046 flows 
through Q1050 causing the voltage at the collector of 
Q1050 to go positive. Thus, the negative-going input signal 
is inverted to a positive-going signal at the output connector 
(J1058). The gain of the negative feedback amplifier of 
Q1040, Q1046, and Q1050 is approximately 2, determined 
by the ratio of R22 (see diagram 4) to R1052. 



B SAWTOOTH Output 

The B SAWTOOTH circuitry operates the same as the A 
SAWTOOTH circuitry except that the sawtooth signal origi- 
nates from the time-base unit installed in the B HORIZ plug- 
in compartment. The remaining Signals Out connectors are 
coupled through the Signals Out board to their appropriate 
circuits. 



Readout System 

The Readout system provides alphanumeric display of 
information encoded by the plug-in units. This display is pre- 
sented on the crt and is written by the crt beam on a time- 
shared basis with the analog waveform display. 




The following terms are used to describe the Readout 
System: 

Character — A single number, letter, or symbol displayed 
on the crt, either alone or in combination with other 
characters. 

Word — Made up of a group of related characters. In the 
Readout System, a word can consist of up to 10 
characters. 

Frame — A display of all words for a given operating 
mode and plug-in combination. Up to 8 words can be 
displayed in one frame. Figure 3-24 shows the position of 
each word in a complete frame. 



3-34 



REV JUN 1981 




Theory of Operation — 7844/R7844 Service 



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1676-18 (1675-8) 



Fig. 3-24. Location of readout display on the crt identifying the 
originating plug-in and channel. 

Column — One of the vertical lines in the Character Selec- 
tion Matrix (see Fig. 3-25). Columns C-0 (column zero) to 
C-10 (column 10) can be addressed by the system. 

Row — One of the horizontal lines in the Character Selec- 
tion Matrix. Rows R-1 (row 1) through R-10 (row 10) and 
R-14 (row 14) can be addressed by the system. 

Time-Slot — A location in a pulse train. In the Readout 
System, the pulse train consists of 10 negative-going 
pulses. Each time-slot pulse is assigned a number be- 
tween 1 and 10. For example, the first time-slot is TS-1. 

Time-Multiplexing— Transmission of data from two or 
more sources over a common path by using different 
time intervals for different signals. 




Fig. 3-25. Typical readout display where only channel 2 of the 
Right Vertical and B Horizontal units is displayed. 



Display Format 

Up to eight words of readout information can be dis- 
played on the crt. The position of each word is fixed and is 
directly related to the plug-in unit from which it originated. 
Figure 3-24 shows the area of the graticule where the 
readout from each plug-in unit is displayed. Notice that 
Channel 1 of each plug-in unit is displayed within the top 
division of the crt and Channel 2 is displayed directly below 
within the bottom division. Figure 3-25 shows a typical dis- 
play where only Channel 2 of the Right Vertical and B Hori- 
zontal units is selected for display. 



Each word in the readout display can contain up to 10 
characters, although the typical display will contain between 
2 and 7 characters per word. The characters are selected 
from the Character Selection Matrix shown in Fig. 3-26. In 
addition, 12 operational addresses are provided for special 
instructions to the Readout System. The unused locations 
in the Matrix (shaded area) are available for future expan- 
sion of the Readout System. The method of addressing the 
locations in the Character Selection Matrix is described in 
the following discussion. 



Developing the Display 

The following basic description of the Readout System 
uses the block diagram shown in the Diagrams section. This 
description is intended to relate the basic function of each 
stage to the operation of the overall Readout System. De- 
tailed information on circuit operation is given later. 



The key block in the Readout System is the Timer stage. 
This stage produces the basic signals that establish the tim- 
ing sequences within the Readout System. Period of the 
timing signal is about 250 ms (drops to approximately 210 /is 
when Display-Skip is received; see detailed description of 
Timer stage for further information). This stage also pro- 
duces control signals for other stages within this circuit and 
interrupt signals to the Vertical Amplifier, Horizontal Amplifi- 
er, and Logic circuits, which allow a readout display to be 
presented. The Time-Slot Counter stage receives a 
trapezoidal voltage signal from the Timer stage and directs 
it to one of ten output lines. These output lines are labeled 
TS-1 through TS-10 (time-slots 1 through 10) and are con- 
nected to the vertical and horizontal plug-in compartments 
as well as to various stages within the Readout System. 
The output lines are energized sequentially, so there is a 
pulse on only one of the 10 lines during any 250 ms timing 
period. After the Time-Slot Counter stage has counted time- 
slot 10, it produces an End-of-Word pulse that advances the 
system to the next channel. 



Two output lines, row and column, are connected from 
each channel of the plug-in unit back to the Readout Sys- 
tem. Data is typically encoded on these output lines by con- 



REV JUN 1981 



3-35 





CURRENT 

(MILLI- 0 0.1 0.2 




DECIMAL POINT CHARACTER. SEE DECIMAL POINT CHARACTER DESCRIPTION IN TEXT. <1 195 25)2390 47 











































































Theory of Operation — 7844/R7844 Service 



necting resistors between them and the time-slot input lines. 
The resultant output is a sequence of 10 analog current 
levels that range from 0 to 1 mA (100 M/step) on the row 
and column output lines. This row and column correspond 
to the row and column of the Character Selection Matrix in 
Fig. 3-26. The standard format for encoding information 
onto the output lines is given in Table 3-1 . (Special-purpose 
plug-in units may have their own format for readout; these 
special formats will be defined in the manuals for these 
units.). 

The encoded column and row data from the plug-in units 
is selected by the Column Data Switch and Row Data 
Switch stages, respectively. These stages take the analog 
currents from the eight data lines (2 channels from each of 
the four plug-in compartments) and produce a time- 
multiplexed analog voltage output containing all of the col- 
umn and row information from the plug-ins. The Column 
Data Switch and Row Data Switch are sequenced by the 
binary Channel Address Code from the Channel Counter. 

The time-multiplexed output of the Column Data Switch 
is monitored by the Display-Skip Generator to determine if it 
represents valid information that should be displayed. 
Whenever information is not encoded in a time-slot, the Dis- 
play-Skip Generator produces an output level to prevent the 
Timer stage from producing the control signals that normally 
interrupt the crt display and present a character. 

Table 3-1 

STANDARD READOUT FORMAT 



Time-Slot 

Number 


Description 


TS-1 


Determines decimal magnitude (num- 
ber of zeros displayed or prefix change 
information) or the IDENTIFY function 
(no display during this time-slot) 


TS-2 


Indicates normal or inverted input (no 
display for normal) 


TS-3 


Indicates calibrated or uncalibrated 
condition of plug-in variable control (no 
display for calibrated condition) 


TS-4 


Scaling 


TS-5 


Not encoded by plug-in unit — left blank 


TS-6 


to allow addition of zeros by Readout 


TS-7 


System 


TS-8 


Defines the prefix that modifies the 
units of measurement 


TS-9 


Define the units of measurement of the 


TS-10 


plug-in unit — may be standard units of 
measurement (V, A, S, etc.) or special 
units selected from the Character Se- 
lection Matrix. 



The analog outputs of the Column Data Switch and Row 
Data Switch are connected to the Column Decoder and 
Row Decoder stages, respectively. These stages sense the 
magnitude of the analog voltage input and produce an out- 
put current on one of ten lines. The outputs of the Column 
Decoder stage are identified as C-1 through C-1 0 (column 1 
through 1 0) corresponding to the encoded column informa- 
tion. Likewise, the outputs of the Row Decoder stage are 
identified as R-1 through R-10 (row 1 through 10) corre- 
sponding to the encoded row information. The primary func- 
tion of the row and column outputs is to select a character 
from the Character Selection Matrix to be produced by the 
Character Generator stage. These outputs are also used at 
other points within the system to indicate when certain infor- 
mation has been encoded. One such stage is the Zeros Log- 
ic and Memory. During time-slot 1 (TS-1), this stage checks 
if zero-adding or prefix-shifting information has been en- 
coded by the plug-in unit, and stores it in the memory until 
time-slots 5, 6, or 8. After storing this information, it triggers 
the Display-Skip Generator stage so that there is no display 
during time-slot 1 (as defined by Standard Readout Format; 
see Table 3-1). When time-slots 5, 6, and 8 occur, the mem- 
ory is addressed and any information stored there during 
time-slot 1 is transferred to the input of the Column Decoder 
stage to modify the analog data during the applicable time- 
slot. 



Also, the Zeros Logic and Memory stage produces the 
IDENTIFY function. When time-slot 1 is encoded for IDENTI- 
FY (column 10, row 3), this stage produces an output level, 
which connects the Column Data Switch and Row Data 
Switch to a coding network within the Readout System. 
Then, during time-slots 2 through 9, an analog current out- 
put is produced from the Column Data Switch and Row 
Data Switch, which addresses the correct points in the 
Character Selection Matrix to display the word “IDENTIFY” 
on the crt. The Zeros Logic and Memory stage is reset after 
each word by the Word Trigger pulse. 



The Character Generator stages produce the characters 
that are displayed on the crt. Any of the 50 characters 
shown on the Character Selection Matrix of Fig. 3-26 can be 
addressed by proper selection of the column and row cur- 
rents. Only one character is addressable in any one time- 
slot; a space can be added into the displayed word by the 
Decimal Point Logic and Character Position Counter stage 
when encoded by the plug-in. The latter stage counts the 
number of characters generated and produces an output 
current to step the display one character position to the 
right for each character. In addition, the character position is 
advanced once during each of time-slots 1 , 2, and 3, wheth- 
er a character is generated during these time-slots or not. 
This action fixes the starting point of the standard-format 
display such that the first digit of the scaling factor always 
starts at the same point within each word regardless of the 
information encoded in time-slot 1 , 2, or 3 preceding this 
digit. Also, by encoding row 10 and column 0 during any 
time-slot, a blank space can be added to the display. Deci- 



REV JUN 1981 



3-37 




Theory of Operation — 7844/R7844 Service 

mal points can be added to the display at any time by ad- 
dressing the appropriate row and column. (See Character 
Selection Matrix for location of decimal points.) The Decimal 
Point Logic and Character Position Counter stage is reset 
after each word by the Word Trigger pulse. 



The Format Generator stage provides the output signals 
to the vertical and horizontal deflection systems of the in- 
strument to produce the character display. The binary Chan- 
nel Address Code from the Channel Counter stage is 
connected to this stage, so that the display from each chan- 
nel is positioned to the area of the crt associated with the 
plug-in and channel originating the word (see Fig. 3-24). The 
positioning current or decimal point location current gener- 
ated by the Decimal Point Logic and Character Position 
Counter stage is added to the Horizontal (X) signal at the 
input to the Format Generator stage to provide horizontal 
positioning of the characters within each word. The X- and 
Y-Readout signals are connected to the Horizontal Amplifier 
and Vertical Amplifier through the X- and Y-Buffer stages. 



The Word Trigger stage produces a trigger from the End- 
of-Word pulse generated by the Time-Slot Counter stage 
after the tenth time-slot. This Word Trigger pulse advances 
the Channel Counter to display the information from the 
next channel or plug-in. It also provides a reset pulse to the 
Zeros Logic and Memory stage and the Decimal Point Logic 
and Character Position Counter stage. This Word Trigger 
stage can also be advanced to jump a complete word or a 
portion of a word when a Jump command is received from 
the Row Data Switch stage. 



Timer 

Timer U2126 establishes the timing sequence for all cir- 
cuits within the Readout System. This stage produces sev- 
en time-related output waveforms (see Fig. 3-27). The 
triangle waveform produced at pin 6 forms the basis for the 
remaining signals. The basic period of this triangle 
waveform is approximately 250 ns as controlled by RC net- 
work R2135 and C2135. The triangle waveform is clipped 
and amplified by U2126 to form the trapezoidal output sig- 
nal at pin 10. The amplitude of this output signal is exactly 
15 V as determined by U2126 (exact amplitude necessary 
to accurately encode data in plug-in units; see Encoding the 
Data). The Trigger output at pin 5 provides the switching 
signal for the Time-Slot Counter and Word Trigger stages. 



The signals at pins 12, 13, 14, and 16 are produced only 
when the Iriangle waveform is on its negative slope and the 
trapezoidal waveform has reached the lower level. The tim- 
ing sequence of these waveforms is important to the oper- 
ation of the Readout System (see expanded waveforms in 
Fig. 3-28). The Z-Axis Inhibit command at pin 14 is produced 
first. This negative-going signal provides a blanking pulse to 
the Z-Axis Logic stage (see diagram 5) to blank the crt be- Fig. 3-27. Output waveforms of Timer stage. 




3-38 



REV JUN 1981 




Theory of Operation — 7844/R7844 Service 









CHARACTER 
SCAN 
PIN 16 

BEAM 2 
Z-AXIS LOGIC 
OFF COMMAND 
PIN 14 




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PIN 13 


















































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READOUT 
INTENSITY 
PIN 12 

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Fig. 3-28. Detail of output at pins 12, 13, 14, and 16 of U2126. 

fore the display is switched to the Readout System. It also 
produces the Strobe pulse through Q2138 and CR2142 to 
signal other stages within the Readout System to begin the 
sequence necessary to produce a character. The collector 
level of Q2138 is also connected to Symbols Character 
Generator, U2272, through CR2140. This activates U2272 
during the quiescent period of the Strobe pulse (collector of 
Q2138 negative) and diverts the output current of Row De- 
coder U2185 to row 2. The purpose of this configuration is 
to prevent the Zeros Logic and Memory stage U2232 from 
storing incorrect data during the quiescent period of the 
Strobe pulse. When the Strobe pulse goes positive, CR2140 
is reverse-biased to disconnect Q2138 from U2272 and al- 
low the Row Decoder to operate in the normal manner. 



The next signal to be produced is the X-Y Inhibit com- 
mand at pin 13. This positive-going signal disconnects the 
plug-in signals from the beam 2 vertical and horizontal de- 
flection systems. The Ready signal derived from this output 
is connected to the Decimal Point and Character Position 
Center stage and the Format Generator stage. 



The Z Readout output at pin 12 is produced next. This 
current is connected to the crt circuit to unblank the crt to 
the intensity level determined by the READOUT INTENSITY 
control. The Character Scan ramp at pin 16 started to go 
negative as this timing sequence began. However, character 
generation does not start until the readout intensity level 
has been established. The triangular Character Scan ramp 
runs from approximately —2 V to approximatley -8.5 V, 
then returns to the original level. This waveform provides 
the scanning signal for the Character Generator stage. 
Character Scan Adjustment R2128 sets the dc level of the 
Character Scan ramp for complete characters on the 
display. 



The Timer stage operates in one of two modes as con- 
trolled by the Display-Skip level at pin 4. The basic mode 
just described is a condition that does not occur unless all 
ten characters of each word (80 characters total) are dis- 
played on the crt. Under typical conditions, only a few char- 
acters are displayed in each word. The Display-Skip level at 
pin 4 determines the period of the Timer output signal. 
When a character is to be generated, pin 4 is LO and the 
circuit operates as just described. However, when a charac- 
ter is not to be displayed, a HI level is applied to pin 4 of 
U2126 through CR2125 from the Display-Skip Generator 
stage. This signal causes the Timer to shorten its period of 
operation to approximately 210 /*s. The waveforms in Fig. 
3-29 show the operation of the Timer stage when the Dis- 
play-Skip condition occurs for all positions in a word. Notice 
that there is no output at pins 12, 13, 14, and 16 under this 
condition. This means that the crt display is not interrupted 
to display characters. Also notice that the triangle waveform 
at pin 6 does not go as far negative, and that the negative 
portion of the trapezoidal waveform at pin 10 is shorter. 
Complete details on operation of the Display-Skip Gener- 
ator are given later. 

The Timer operation is also controlled by the Single-Shot 
Lockout level at pin 2. If this level is LO, the Timer operates 
as just described. However, if the Single-Shot Lockout 
stage sets a HI level at this pin, the Timer stage is locked 
out and cannot produce any output signals (see Single-Shot 
Lockout description for further information). 

READOUT INTENSITY control R978 (see diagram 1) 
sets the intensity of the readout display independently of the 
BEAM 1 or BEAM 2 INTENSITY controls. The READOUT 
INTENSITY control also provides a means of turning the 
Readout System off when a readout display is not desired. 
When R978 is turned fully counterclockwise, the switch in 
series with the Readout Intensity line opens. The current to 
pin 11 of U2126 is interrupted, and at the same time, a 
positive voltage is applied to pin 4 through CR2124. The 



REV JUN 1981 



3-39 





Theory of Operation — 7844/R7844 Service 

positive voltage switches the stage to the same conditions 
as were present under the Display-Skip condition. There- 
fore, the crt display is not interrupted to present characters. 
However, time-slot pulses continue to be generated. 



Time-Slot Counter 

Time-Slot Counter U2159 is a sequential switch that 
directs the trapezoidal waveform input at pin 8 to one of its 
10 output lines. These time-slot pulses are used to interro- 
gate the plug-in units to obtain data for the Readout Sys- 
tem. The Trigger pulse at pin 15 switches the Time-Slot 
Counter to the next output line; the output signal is 
sequenced consecutively from time-slot 1 through time-slot 
1 0. Figure 3-30 shows the time relationship of the time-slot 
pulses. Notice that only one line carries a time-slot pulse at 
any given time. When time-slot 10 is completed, a negative- 
going End-of-Word pulse is produced at pin 2. The End-of- 
Word pulse provides a drive pulse for the Word Trigger 
stage and also provides an enabling level to the Display- 
Skip Generator during time-slot 1 only. 

Pin 1 6 is a reset input for the Time-Slot Counter. When 
this pin is held LO, the Time-Slot Counter resets to time-slot 
1 . The Time-Slot Counter can be reset in this manner only 
when a Jump command is received by U2155C and D (see 
following discussion). 



Word Trigger 

The Word Trigger stage is made up of U2155A and B. 
Quiescently, pin 3 of U2155A is LO as established by the 
operating conditions of U2155C and D. Therefore, the LO 
End-of-Word pulse produced by the Time-Slot Counter re- 
sults in a HI level at pin 1 of U2155A. This level is inverted 
by U2155B to provide a negative-going Word Trigger pulse 
to the Channel Counter. 



Also, a Word Trigger pulse is produced by U2155B when 
a Jump Command is received at pin 8 of U2155C. This con- 
dition can occur during any time-slot (see Row Decoder for 
further information on origin of the Jump Command). Inte- 
grated circuit U2155C and D are connected as a bistable 
flip-flop. The positive-going Jump Command at pin 8 of 
U2155C produces a LO at pin 10. This LO is inverted by 
U2155D to produce a HI at pin 13, which allows pin 9 to be 
pulled HI through CR2156. The flip-flop has now been set 
and remains in this condition until reset, even though the 
Jump Command at pin 8 returns to its LO level. The HI 
output level at pin 13 turns on Q2159 to pull pin 16 of the 
Time-Slot Counter LO. This resets the Time-Slot Counter to 

Fig. 3-29. Timer stage operation when Display-Skip condition time-slot 1 and holds it there until the word Trigger is reset, 
occurs. 




3-40 



REV JUN 1981 




Theory of Operation — 7844/R7844 Service 




Fig. 3-30. Timer relationship of the time-slot (TS) pulses pro- 
duced by U2 159. 



At the same time, a HI level is applied to pin 4 of the Timer 
through CR2157 and CR2125. This HI level causes the Tim- 
er to operate in the Display-Skip mode, so a character is not 
generated. 



The next Trigger pulse is not recognized by the Time-Slot 
Counter, since U2159 is locked in time-slot 1 by U2155. 
However, this Trigger pulse resets the Word Trigger stage 
through C2155. Pin 13 of U2155D goes LO to enable the 
Time-Slot Counter and Timer stages for the next time-slot 
pulse. Simultaneously, when U2155D switches output 
states, the resulting negative-going edge is connected to pin 
3 of U2155A. This results in a negative-going Word Trigger 
output at pin 4 to advance the Channel Counter to the next 
word. When the next Trigger pulse is received at pin 15, the 
Time-Slot Counter returns to the normal sequence of oper- 
ation and produces an output on the time-slot 1 line. 



Channel Counter. 

Channel Counter U2250 is a binary that produces the 
Channel Address Code for the Column and Row Decoder 
stages and the Format Generator stage. This code instructs 
these stages to sequentially select and display the 8 chan- 
nels of data from the plug-ins. Table 3-2 gives the eight 
combinations of the Channel Address Code and the resul- 
tant channel selected with each combination. 



Table 3-2 

CHANNEL ADDRESS CODE 



Pin 11 
U2250 


Pin 8 
U2250 


Pin 9 
U2250 


Channel 

Displayed 


LO 


LO 


LO 


Channel 2 
Left Vertical 


LO 


LO 


HI 


Channel 1 
Left Vertical 


LO 


HI 


LO 


Channel 2 
Right Vertical 


LO 


HI 


HI 


Channel 1 
Right Vertical 


HI 


LO 


LO 


Channel 2 
A Horizontal 


HI 


LO 


Hi 


Channel 1 
A Horizontal 


HI 


HI 


LO 


Channel 2 
B Horizontal 


HI 


HI 


HI 


Channel 1 
B Horizontal 



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3-41 





Theory of Operation — 7844/R7844 Service 



Readout Control 

The primary readout controls, located on the front panel, 
are shown on the Calibrator board (diagram 1). In the follow- 
ing discussion, refer to both diagrams 1 and 17. 



The READOUT INTENSITY control sets the readout sys- 
tem to one of three modes of operation. In the OFF position 
the Readout Intensity line (pin 3 of P910) is open. This line is 
connected to the Timer stage on the Readout board, 
through pin 5 of P2118 and R2122. The open line sets a HI 
at pin 1 1 of U2126, this HI locks out the timer stage, which 
in turn inhibits the entire Readout system. 



When the READOUT INTENSITY control is set to 
PULSED, the shield of the coaxial cable, connecting J992 
on the Calibrator board to J2192 on the Readout board, is 
grounded by S978. Grounding the shield of this cable pro- 
vides a current path from the Calibrator board to the emitter 
of Q2108 through R2109. The current through Q2108 pro- 
duces a LO lockout level to the Single-Shot Lockout stage. 
One frame of readout is produced each time an appropriate 
signal is applied to J2192. A negative-going signal at J2192 
is differentiated by C2101 and R2102. The resulting spike 
reverse biases Q2108 to momentarily allow its collector to 
go HI. This enables the Single-Shot Lockout stage for a 
single-shot readout display. 



The EXTERNAL-BEAM 2 GATED switch (S974) routes 
either an externally generated gate or the beam 2 gate sig- 
nal to the Readout Single-Shot circuitry. The beam 2 gate 
initiates a frame of readout each time the beam 2 horizontal 
system completes a sweep. One frame of readout can also 
be initiatec by the MANUAL push button. When the MAN- 
UAL push button is pressed, C970 discharges toward 
ground through R970. The negative-going pulse is then 
coupled to the Readout Lockout stage through C972 and 
J992. 



When the READOUT INTENSITY control is set out of the 
OFF position and not set to the PULSED position, the 
Readout System runs continuously. The emitter of Q21 08 
has no ground return in this position, so its collector rises 
positive and sets a HI on pin 8 of U2120, which enables the 
Readout System to operate in the free-running mode. 



Readout Mode switch (S2110), located internally on the 
Readout board, must be set to its F.R. (Free-Run) position 
for the READOUT INTENSITY control to operate properly. 
However, the GATE TRIG'D position of S21 10 may be use- 
ful with Option 22. Refer to the Option section in this manual 
for information on how S2110 affects the operation of Op- 
tion 22. 



Single-Shot Lockout 

Integrated circuit U2120 makes up the Single-Shot 
Lockout stage. This stage allows a single readout frame 
(eight complete words) to be displayed on the crt, after 
which the Readout System is locked out, so further readout 
displays are not presented until the circuit is reset. Integrat- 
ed circuit U2120B and U2120C are connected to form a 
bistable flip-flop. For normal operation, pin 8 of U2120C is 
pulled HI through R2108. This activates U2120C to result in 
a LO output level at pin 10, enabling the Timer stage to 
operate in the free-running manner described previously. 



The output of the Single-Shot Lockout stage remains LO 
to allow U2126 to operate in the free-running mode until a 
LO is received at pin 8 of U2120C. When this occurs, the 
output level at pin 10 of U2120C does not change immedi- 
ately. However, the Readout System is now enabled as far 
as the single-shot lockout function is concerned. If the 
Channel Counter has not completed word 8, the Readout 
System continues to operate in the normal manner. Howev- 
er, when word 8 is completed, the negative-going End-of- 
Frame pulse is produced at pin 1 1 of U2250 as the Channel 
Counter shifts to the code necessary to display word one. 
This pulse is coupled to pin 6 of U2120B. The momentary HI 
at pin 6 activates U2120B and its output stage goes LO to 
disable U2120C (pin 8 already LO). The output of U2120C 
goes HI to disable the Timer, so it operates in the Display- 
Skip mode. The HI at pin 10 of U2120C also holds U2120B 
enabled, so it maintains control of the flip-flop. 



The Single-Shot Lockout stage remains in this condition 
until a positive-going trigger pulse is applied to pin 8 of 
U2120C. This trigger pulse produces a LO at pin 10 of 
U2120C to enable U2126 and disable U2120B. Now, the 
Timer can operate in the normal manner for another com- 
plete frame. When word 8 is completed, the Channel 
Counter produces another End-of-Frame pulse to again lock 
out the Timer stage. (For further information on the Readout 
Mode, see the Readout Control description.) 



Encoding the Data 

Data is conveyed from the plug-in units to the Readout 
System in the form of an analog (current level) code. The 
characters that can be selected by the encoded data are 
shown on the Character Selection Matrix (see Fig. 3-26). 
Each character requires two currents to define it; these cur- 
rents are identified as the column current and the row cur- 
rent, corresponding to the column and row of the matrix. 
The column and row data is encoded by programming the 
plug-iri units. Figure 3-31 shows a typical encoding scheme 
using resistors for a voltage-sensing amplifier plug-inunit. 
Notice that the 10 time-slot (TS) pulses produced by the 
Time-Slot Counter stage are connected to the plug-in unit. 



3-42 



REV JUN 1981 




Theory of Operation — 7844/R7844 Service 




Fig. 3-31. Typical encoding scheme for voltage-sensing plug-in unit. Coding shown for deflection factor of 100 ^V. 



However, time-slots 5, 6, 7, and 10 are not used by the plug- 
in unit to encode data when using the Standard Readout 
Format. (See Table 3-1 for Standard Readout Format.) The 
amplitude of the time-slot pulse is exactly - 1 5 V as deter- 
mined by the Timer stage. Therefore, the resultant output 
current from the plug-in units can be accurately controlled 
by the programming resistors in the plug-in units. 

For example, in Fig. 3-31 resistors RIO through R90 con- 
trol the row analog data, which is connected back to the 
Readout System. Figure 3-32 shows an idealized output 
current waveform of row analog data, which results from 
the time-slot pulses. Each of the row levels of current shown 
in these waveforms correspond to 100 pA of current. The 



row numbers on the left-hand side of the waveform corre- 
spond to the rows in the Character Selection Matrix (see 
Fig. 3-26). The row analog data is connected back to the 
Readout System via terminal B37 of the plug-in interface. 



The Column analog data is defined by resistors R110 
through R190. The program resistors are connected to the 
time-slot lines by switch closures to encode the desired 
data. The data as encoded by the circuit shown in Fig. 3-31 
indicates a 1 00 sensitivity with the crt display inverted 
and calibrated deflection factors. This results in the idealized 
output current waveforms shown in Fig. 3-32 at the column 
analog data output, terminal A37 of the plug-in interface. 



REV JUN 1981 



3-43 






Theory of Operation— 7844/R7844 Service 




Fig. 3-32. Idealized current waveforms of (A) Row analog data 
and (B) Column analog data. 

Resistor R111, connected between time-slot 1 and the 
column analong data output, encodes two units of current 
during time-slot 1 . Referring to the Character Selection Ma- 
trix, two units of column current, along with the two units of 
row current encoded by resistor RIO (row 3), indicates that 
two zeros should be added to the display. Resistor R120 
adds one unit of column current during time-slot 2, and 
along withthe one unit of current from the row output, the 
Readout system is instructed to add an invert arrow to the 
display. Resistor R130 is not connected to the time-slot 3 
line, since the deflection factor is calibrated. Therefore, there 
is no display on the crt. (See Display-Skip Generator for 
further information.) 



During lime slot 4, two units of column current are en- 
coded by R140. There is no row current encoded during this 
time-slot; this results in the numeral 1 being displayed on 
the crt. Neither row nor column analog data is encoded dur- 
ing time-slots 5, 6, and 7 as defined by the Standard 
Readout Format. During time-slot 8, two units of column 
current and three units of row current are encoded by resis- 
tors R181 and R180, respectively. This addresses the m pre- 
fix in the Character Selection Matrix. 



The final data output is provided from time-slot 9 by 
R190 connected to the column output and R90 to the row 
output. These resistors encode two units of column current 
and four units of row current to cause a V (volts) to be 
displayed. Time-slot 10 is not encoded, in accordance with 
the Standard Readout Format. The resultant crt readout will 
be i 100 iA/. 



In the above example, the row analog data was pro- 
grammed to define which row of the Character Selection 
Matrix was addressed to obtain information in ech time-slot. 
The column data changes to encode the applicable readout 
data as the operating conditions change. For example, if the 
variable control of the plug-in unit was activated, R130 
would be connected between time-slot 3 and the column 
analog data output line. This encodes 10 units of column 
current (see shaded area in time-slot 3 of the waveform 
shown in Fig. 3-32). Since one unit of row current is also 
encoded during this time-slot by R30, a > (greater than) 
symbol is added to the display. The crt readout will now 
show | > 100 mV. In a similar manner, the other switches 
can change the encoded data for the column output and 
thereby change the readout display. See the following de- 
scription for decoding this information. 



The column analog data encoded by most plug-in units 
can be modified by attenuator probes connected to the input 
connectors of amplifier plug-in units. A special coding ring 
around the input connector of the plug-in unit senses the 
attenuation ratio of the probe (with readout-coded probes 
only). The probe contains a circuit that provides additional 
column current. For example, if a 1 0X attenuator probe is 
connected to a plug-in unit encoded for 1 00 mV as shown in 
Fig. 3-32, an additional unit of current is added to the col- 
umn analog data during time-slot 1 . Since two units of cur- 
rent were encoded by R111 (see Fig. 3-31), this additional 
current results in a total of three units of column analog 
current during this time-slot. Referring to the Character Se- 
lection Matrix, three units of column current, along with the 
two units of row current encoded by R10, indicates that the 
prefix should be shifted one column to the left. Since this 
instruction occurs in the same time-slot that previously indi- 
cated that two zeros should be added to the display and 
only one instruction can be encoded during a time-slot, the 
zeros do not appear in the display. The crt readout will now 
be changed to 1 mV (readout program produced by plug-in 
same as for previous example). 



Three other lines of information are connected from the 
plug-in compartments to the Readout System. The column 
and row analog data from Channel 2 of a dual-channel plug- 
in are connected to the Readout System through terminals 
A38 and B38 of the plug-in interface, respectively. Force 
readout information is encoded on terminal A35; the func- 
tion of this input is described under Column and Row Data 
Switches. 



3-44 



REV JUN 1981 





Theory of Operation — 7844/R7844 Service 



The preceding information gave a typical example of en- 
coding data from an amplifier plug-in unit. Specific encoding 
data and circuitry is shown in the individual plug-in unit 
manuals. 

Column and Row Data Switches 

The encoding data from the plug-in units is connected to 
the Column and Row Data Switch stages. A column-data 
line and a row-data line convey analog data from each of the 
eight data sources (two channels from each of the four plug- 
in compartments). 



The Column Data Switch U2190 and the Row Data 
Switch U2180 receive the Channel Address Code from the 
Channel Counter. This binary code directs the Column Data 
Switch and the Row Data Switch as to which channel 
should be the source of the encoding data. Table 3-2 gives 
the eight combinations of the Channel Address Code and 
the resultant channel selected with each combination. These 
stages ha ve nine inputs and provide a time-multiplexed out- 
put at pin 7, which includes the information from all of the 
input channels. Eight of the nine inputs to each stage origi- 
nate in the plug-in units; the ninth input comes from a spe- 
cial data-encoding network composed of resistors R2191 
through R2199 and R2201 through R2209. (See Zeros Log- 
ic and Memory description for further information on ninth 
channel.) 



In addition to the encoding data inputs from the plug-in 
units, inputs are provided to the Column Data Switch from 
the VERTICAL MODE and HORIZONTAL MODE switches 
to inhibit the readout for any plug-in unit(s) not selected for 
display. When a unit is not selected, the respective line is HI 
to forward bias the associated diodes: CR2162 and 
CR2163, CR2166 and CR2167, CR2170 and CR2171, or 
CR2174 and CR2175. The forward-biased diodes cause the 
channel switches to bypass the encoded data from the in- 
hibited channel. However, since it may be desired to display 
information from special-purpose plug-in units (even though 
they do not produce a normal waveform display on the crt), 
a feature is provided to override the channel inhibit. This is 
done by applying a LO to the associated Force Readout 
input. The LO level diverts the HI channel-inhibit current and 
allows the data from this plug-in unit to reach the Column 
Data Switch, even though it has not been selected for dis- 
play by the mode switch. 



Row Match adjustment R2182 sets the gain of the Row 
Data Switch to match the gain of the Row Decoder for cor- 
rect output. Column Match adjustment R2213 performs the 
same function for the Column Data Switch stage. 

Display-Skip Generator 

The Display-Skip Generator is made up of Q2215, 
Q2233, Q2225, and Q2229. This stage monitors the time- 



multiplexed column data at the output of the Column Data 
Switch during time-slot to determine if the information at 
this point is valid data that should result in a crt display. 
Quiescently, there is approximately 1 00 n A of current flow- 
ing through R2213 from Q2240 and the Zeros Logic and 
Memory stage. (The purpose of this quiescent current will 
be discussed in connection with the Zeros Logic and Mem- 
ory stage.) This current biases Q221 5A so that its base is 
approximately 0.2 V more positive than the base of Q2215B 
in the absence of column data. Therefore, since Q2215A 
and Q2215B are connected as a comparator, Q2215A will 
remasn on unless its base is pulled more negative than the 
base of Q2215B. 



The analog data output from the Column Data Switch 
produces a 0.5 V (approximately) change for each unit of 
column current that has been encoded by the plug-in unit. 
Whenever any information appears at the output of the Col- 
umn Data Switch, the base of Q2215A is pulled more nega- 
tive than the base of Q2215B, resulting in a negative (LO) 
Display-Skip output to the Timer stage through Q2225. Re- 
call that a LO was necessary at the skip input of the Timer 
so it could perform the complete sequence necessary to 
display a character. 



Transistors Q2223 and Q2229 also provide Display-Skip 
action. The End-of-Word level connected to their emitters is 
LO only during time-slot 1. This means they are enabled 
only during this time-slot. These transistors allow the Zeros 
Logic and Memory stage to generate a Display-Skip signal 
during time-slot 1 when information that is not to be dis- 
played on the crt has been stored in memory (further infor- 
mation is given under Zeros Logic and Memory). 



Column and Row Decoders 

The Column Decoder, U2244, and Row Decoder, U2185, 
sense the magnitude of the analog voltages at their inputs 
(pin 10) and produce a binary output on one of ten lines 
corresponding to the column or row data encoded by the 
plug-in unit. These outputs provide the Column Digital Data 
and Row Digital Data, which is used by the Character Gen- 
erator stages to select the desired character for display on 
the crt. The column and row data is also used throughout 
the Readout System to perform other functions. 



The input current at pin 9 of the Column Decoder stage is 
steered to only one of the ten Column Digital Data outputs. 
When a Display-Skip signal is present (collector of Q2225 
HI), pin 9 is pulled HI through CR2226. This ensures that no 
current is connected to the Character Generator stage un- 
der this condition. Notice the corresponding input on the 
Row Decoder. This input is connected to ground and causes 
only one of the ten row outputs to saturate to ground. 



REV JUN 1981 



3-45 




Theory of Operation — 7844/R7844 Service 



The network at the input of the Row Decoder, made up 
of Q2153 and its associated components, is a Row-14 de- 
tector that produces the Jump Command. This row current 
is encoded by special-purpose plug-ins to cause all or part 
of a word to be jumped. Whenever row 14 (13 units of row 
current, or 1 .3 mA) is encoded, the base of Q2153 is pulled 
negative enough so that this transistor is reverse biased to 
produce a HI Jump Command output at its collector. The 
Jump Command is connected to the Word Trigger stage to 
advance th€> Channel Counter to the next word and to reset 
the Time-Slot Counter to time-slot 1 



Zeros Logic and Memory 

The Zeros Logic and Memory stage, U2232, stores data 
encoded by the plug-in units to provide zeros-adding and 
prefix-shifting logic for the Readout System. The Strobe 
pulse at pin 1 5 goes positive when the data has stabilized 
and can be inspected. This activates the Zeros Logic and 
Memory stage so that it can store the encoded data. A 
block representation of the memory sequence is shown in 
Fig. 3-33. 



Typical output waveforms for the five possible input con- 
ditions that can occur are shown in Fig. 3-34. When time- 



slot 1 occurs, a store command is given to all of the 
memories. If the plug-in units encoded data for column 1 , 2, 
3, 4, or 10 during time-slot 1, the appropriate memory (or 
memories) is set. Notice that row 3 information from the 
Row Decoder must also be present at pin 1 6 for data to be 
stored in the memory of U2232. 



If data was encoded during time-slot 1 , a negative-going 
output is produced at pin 7 while the memories are being 
set. This negative-going pulse is connected to the base of 
Q2229 in the Display-Skip Generator to produce a Display- 
Skip output. Since the information encoded during time-slot 
1 was only provided to set the memories and not intended 
to be displayed on the crt at this time, the Display-Skip out- 
put prevents a readout display during this time-slot. 



During time-slot 5, memory A is interrogated. If informa- 
tion was stored in this memory, a positive-going output is 
produced at pin 7. This pulse is connected to pin 10 of the 
Column Decoder through Q2240 to add one unit of current 
at the input of the Column Decoder. This produces a zero 
after the character displayed during time-slot 4. During time- 
slot 6, memory B is interrogated to see if another zero 
should be added. If another zero is necessary, a second 



COLUMN 1 



COLUMN 2 



COLUMN 3 



COLUMN 4 



TIME-SLOT 1 

ROW 3 16 

WORD TRIGGER 9 






r 



INTERROGATION PULSES 

K 



TIME-SLOT 5 



TIME-SLOT 6 






TIME-SLOT 8 




ENABLE TO ALL MEMORIES 
RESET TO ALL MEMORIES 



( 1195 - 35 ) 1676-183 



Fig. 3-33. Block representation of memory sequence in U2232. 



3-46 



REV JUN 1981 




Theory of Operation — 7844/R7844 Service 




Fig. 3-34. Typical output waveforms for Zeros Logic and Memory stage operation (at pin 7 of U2232). 



positive output is produced at pin 7, which again results in a 
column 1 output from the Column Decoder and a second 0 
in the crl display. 



Finally, memory C is interrogated during time-slot 8 to 
obtain information on whether the prefix should be changed, 
or left al the value that was encoded. If data has been en- 
coded that calls for a shift in prefix, a negative-going output 
level is produced at pin 7. This negative level subtracts one 
unit of column current from the data at the input to the Col- 



umn Decoder. Notice on the Character Selection Matrix of 
Fig. 3-26 that when row 4 is programmed, a reduction of 
one column results in a one-column shift of the prefix. For 
example, with the 100 *iV program shown in Fig. 3-31 , if the 
data received from the plug-in called for a shift in prefix, the 
crt readout would be changed to 1 mV (zeros deleted by 
program; see Encoding the Data). 



The 100 mA of quiescent current through R2213 provided 
by Q2240 (see Display-Skip Generator) allows the prefix to 



REV JUN 1981 



3-47 
























Theory of Operation — 7844/R7844 Service 



be shifted from m (100 m A column current, column 1) to no 
prefix (0 column current, column 0) so only the unit of mea- 
surement encoded during time-slot 9 is displayed. Notice 
that reducing the prefix program from column 1 to column 0 
programs the Readout System to not display a character at 
this readout location. 



A further feature of the Zeros Logic and Memory is the 
Identify function. If 10 units of column current are encoded 
by the plug-in unit along with row 3 during time-slot 1 , the 
Zeros Logic and Memory produces a negative-going output 
pulse at pin 1 to switch the Column Data Switch and Row 
Data Switch to the ninth channel. Then, time-slot pulses 2 
through 9 encode an output current through resistors 
R2191 and R2199 for column data and R2201 and R2209 
for row data. This provides the currents necessary to dis- 
play the word IDENTIFY in the word position allotted to the 
channel that originated the Identify command. After comple- 
tion of this word, the Column Data Switch and Row Data 
Switch continue with the next word in the sequence. 



The Word Trigger signal from the Word Trigger stage is 
connected to pin 9 of U2232 through C2242. At the end of 
each word of readout information, this pulse goes LO. This 
erases the four memories in the Zeros Logic and Memory in 
preparation for the data to be received from the next 
channel. 



Character Generator 

The Character Generator stage consists of five similar 
integrated circuits (U2270 through U2278), which generate 
the X (horizontal) and Y (vertical) outputs at pins 1 6 and 1 , 
respectively, to produce the character display on the crt. 
Each integrated circuit can produce 10 individual characters. 
Integrated circuit U2270 (designated "Numerals") can 
produce the numerals 0 through 9 shown in row 1 of the 
Character Selection Matrix (Fig. 3-26). The symbols shown 
in row 2 of the Character Selection Matrix are produced by 
U2272 and U2274 produces the prefixes and some letters, 
used as prefixes, shown in row 4. Integrated circuits U2276 
and U2278 produce the remaining letters shown in rows 5 
and 6 of the Character Selection Matrix. 



All of the Character Generator stages receive the Column 
Digital Data From the Column Decoder, U2244, in parallel. 
However, only one of the Character Generators receives 
row data at a particular time and only the stage receiving 
this row data is activated. For example, if column 2 is en- 
coded, the five Character Generators are enabled so that 
either a 1, >, n, V, or an N can be produced. If row 4 has 
been encoced at the same time, only the Prefix Character 
Generator, U2274, will produce an output to result in a V” 
being displayed. The activated Character Generator pro- 
vides current output for the Format Generator to produce 
the selected character on the crt. In a similar manner, any of 



the characters shown in the Character Selection Matrix can 
be displayed by correct addressing of the row and column. 



Decimal Point Logic and Character Position Counter 

Decimal Point Logic and Character Position Counter 
U2260 performs two functions. The first function is to add a 
staircase current to the X (horizontal) signal to space the 
characters horizontally on the crt. After each character is 
generated, the negative-going edge of the Ready signal at 
pin 5 advances the Character Position Counter. This pro- 
duces a current step output at pin 3, which, when added to 
the X signal, causes the next character to be displayed one 
character space to the right. This stage can also be ad- 
vanced when a Space instruction is encoded so a space is 
left between the displayed characters on the crt. Row 10 
information from the Row Decoder is connected to pin 4 of 
U2260. When row 10 and column 0 are encoded, the output 
of this stage advances one step to move the next character 
another space to the right. However, under this condition, 
no display is produced on the crt during this time-slot, since 
the Character Generators are not activated. 



Time-slot pulses 1 , 2, and 3 are also connected to pin 4 
of U2260 through VR2262, VR2263, and VR2264, respec- 
tively, and R2262 and R2265. This configuration adds a 
space to the displayed word during time-slots 1 , 2, and 3 
even if information is not encoded for display during these 
time-slots. With this feature, the information displayed dur- 
ing time-slot 4 (scaling data) always starts in the fourth char- 
acter position whether data has been displayed in the 
previous time-slots or not. Therefore, the resultant crt dis- 
play does not shift position as normal-invert or cal-uncal 
information is encoded. The Word Trigger pulse connected 
to pin 8 resets the Character Position Counter to the first 
character position at the end of each word. 



The Decimal Point Logic portion of this stage allows deci- 
mal points to be added to the crt display. With the Standard 
Readout Format, row 7, encoded coincident with columns 3 
through 7, addresses a decimal at one of the five locations 
identified in row 7 of the Character Selection Matrix (Fig. 3- 
26). This instruction refers to the decimal point location in 
relation to the total number of characters possible in one 
word (see Fig. 3-35). For example, column 3 encoded with 
row 7 during time-slot 1 places a decimal point in location 
No. 3. As shown in Fig. 3-35, this displays a decimal point 
after the third character that can be displayed on the crt. 
(The first three time-slots produce a space whether data is 
encoded or not; see previous paragraph.) 



When decimal-point data is encoded, the crt is unblanked 
so a readout display is presented. Since row 7 does not 
activate any of the five Character Generators, the crt beam 
is deflected vertically by the application of row-7 data to the 
Y input of the Format Generator through R2280. This places 



3-48 



REV JUN 1981 




Theory of Operation — 7844/R7844 Service 



DECIMAL-POINT LOCATION ENCODED 
DURING THIS TIME-SLOT ~ NO 
DISPLAY 



ALWAYS 
SKIPPED 
EVEN IF ' 
NO DATA 
ENCODED 



FIRST POSSIBLE CHARACTER DIS- 
PLAYED ON CRT AT THIS LOCA- 
TION 



□ . 




DECIMAL POINT 
LOCATION NO. 4 
(COLUMN 4) 



FIRST NUMBER OF MEASUREMENT 
NORMALLY DISPLAYED AT THIS 
LOCATION 



f f f 

DECIMAL POINT 
LOCATION NO. 6 
(COLUMN 6) 



DECIMAL POINT 
LOCATION NO. 3 
(COLUMN 3) 



DECIMAL POINT 
LOCATION NO. 5 
(COLUMN 5) 



DECIMAL POINT 
LOCATION NO. 7 
(COLUMN 7) 



( 1195 - 37 ) 1676-184 



Fig. 3-35. Readout word relating 10 possible character locations to the decimal point instructions that can be encoded, and the 
resultant crt display. 



the decimal point between the characters along the bottom 
line of the readout word. After the decimal point is produced 
in the addressed location, the crt beam returns to the loca- 
tion indicated by the Character Position Counter to produce 
the remainder of the display. 



Decimal- Point Character 

The Decimal-Point Character address (see Fig. 3-26) al- 
lows a decimal point to be encoded for special formats. This 
decimal point can be placed in any character position by 
encoding column 9 with row 8 during the corresponding time 
slot. The application of row 8 data to the X and Y input of 
the Format Generator through R3478 and R3479, respec- 
tively, provides horizontal and vertical positioning current for 
the decimal points. 



desired. The character position current from the Decimal 
Point Logic and Character Position Counter stage is added 
to the X (horizontal) input signal to space the characters 
horizontally on the crt (see previous discussion). 



Y-Output Amplifier 

The Y-output signal at pin 6 of Format Generator U2284 
is connected to the Y-Output Amplifier Q2287-Q2299. This 
stage provides a low-impedance load for the Format Gener- 
ator while providing isolation between the Readout System 
and the driven circuits. Vertical Separation adjustment 
R2291 changes the gain of this stage to control the vertical 
separation between the readout words displayed at the top 
and bottom of the graticule area. 



Format Generator 

The X- and Y-deflection signals produced by the Charac- 
ter Generator stage are connected to pins 2 and 7, respec- 
tively, of Format Generator U2284. The Channel Address 
Code from the Channel Counter is also connected to pins 1 , 
8, and 15 of this stage. The Channel Address Code directs 
the Format Generator to add current to the X and Y signals 
to deflect the crt beam to the area of the crt associated with 
the plug-in channel that originated the information (see Fig. 
3-24). The Channel Address Code and the resultant word 
positions are shown in Table 3-2. The Ready signal at pin 13 
(coinciden t with the Vertical and Horizontal OFF Command 
output) activates this stage when a character is to be dis- 
played or the crt. Resistors R2274 and R2275 determine 
the horizontal and vertical size, respectively, of the dis- 
played characters, and R2273 provides an adjustment to 
set the vertical size of the characters (Character Height) as 



X-Output Amplifier 

The X-Output Amplifier, Q2286-Q2296, operates like the 
Y-Output Amplifier, to provide the horizontal deflection from 
the readout signal available at pin 4 of U2284. The gain of 
this stage is fixed by the values of the resistors in the circuit. 



Display Sequence 

Figure 3-36 shows a flow chart for the Readout System. 
This chart illustrates the sequence of events that occurs in 
the Readout System each time a character is generated and 
displayed on the crt. 



Converter/Rectifiers \|8/ 

The Converter/Rectifiers circuit provides the operating 
power for this instrument from an ac line-voltage source. 



REV JUN 1981 



3-49 






Theory of Operation — 7844/R7844 Service 



GENERATE NEXT 
TIME-SLOT 
PULSE AND 
ENCODE DATA 



GENERATE 
DISPLAY-SKIP 
OUTPUT (SHORTENS 
TIME-SLOT PERIOD) 



/ is ^ 
THIS TS-1, 

. 2, °r 



ADVANCE CHARACTER 
POSITION COUNTER 
TO NEXT CHARACTER 
LOCATION 



^ IS ^ 
.THIS TS-1? . 



X WAS \ 
/ZERO-ADDOR S 
V. PREFIX-SHIFT 
X. ENCODED?/ 



/ IS 
THIS TS S, 
S. 6, or 8 ? ^ 



CHECK DATA 
STORED DURING 
TS-1 AND ADD 
TO PRESENT DATA 



/SHOULD A\ 
/CHARACTER BEX. NO J 
.DISPLAYED DURING>H 
X. THIS TIME • jr I 
\SLOT? / 



/ WAS \ 
/DECIMAL POSIE S. n0 

" ' Vsj tion encoded/ [ 



SELECT CHARACTER 
FROM CHARACTER 
SELECTION MATRIX 



BLANK BEAM 2 
CRT DISPLAY 




UNBLANK CRT 
TO A OR B 
INTENSITY 
LEVEL 



RETURN DISPLAY 
SOURCE TO 
PLUG INS AND 
AOVANCE CHARACTER 
POSITION COUNTER 



SWITCH BEAM 2 CRT 
DISPLAY SOURCE 
FROM PLUG-INS 
TO READOUT 



/'WAS \ 
IDENTIFY 
.ENCODED?^ 




UNBLANK BEAM 2 
TO READOUT 
INTENSITY LEVEL 



BLANK BEAM 2 
CRT DISPLAY 



SCAN AND DISPLAY 
A CHARACTER 




/ WAS \ 
THIS TS-10?^ 



RESET CHARACTER 
POSITION COUNTER 
AND ZEROS LOGIC 
AND MEMORY 



ADVANCE CHANNEL 
COUNTER TO 
NEXT CHANNEL 
(WORD) 



/ IS \NO 
THIS WORD 
\ONE?^/ V 



/ IS \ 
READOUT^ 
SYSTEM IN 
FREE-RUN . 
XMODE/' 



Fig. 3-36. Flow chart for character generation by the Readout System. 



This circuit includes a Line Selector assembly to permit se- 
lection of the nominal operating voltage for the instrument. 
Figure 3-37 shows a detailed block diagram of the 
Converter/Rectifiers circuit. A schematic is provided on dia- 
gram 18. 

Line Input 

Power is applied through Line Filter FL1200, line fuse 
FI 200, POWER switch SI 200, and Line Selector switch 
SI 21 2. The Line Filter is designed to keep power-line inter- 
ference from entering the instrument and to keep the 25 kHz 
(approximately) Inverter signal from entering the power line. 
Resistor R1205 and capacitors Cl 205 and Cl 206 suppress 
reverse-recovery transients of CR1215. 



Line Selector switch SI 21 2 allows the instrument to op- 
erate from either a 115-volt nominal or a 230-volt nominal 
line-voltage; source. In the 115-volt position, rectifier 



CR1215 operates as a full-wave doubler with energy-stor- 
age capacitors Cl 21 6 and Cl 21 7, so the voltage across the 
two capacitors in series will be the peak-to-peak value (ap- 
proximately) of the line voltage. For 230-volt operation, 
CR1215 is connected as a bridge rectifier, and the voltage 
across Cl 21 6 and Cl 21 7 will be the peak value (approxi- 
mately) of the line voltage. As a result, the output voltage 
applied to the Inverter stage is about the same for either 
115-volt or 2340-volt operation. 



Thermistors RT1209 and RT1213 limit the surge current 
demanded by the power supply when it is first turned on. 
After the instrument is in operation, the resistance of the 
thermistor drops so it has little effect on the operation of this 
stage. When the instrument is turned off, the Inverter is 
turned off by the Inverter Stop stage to prevent the sudden 
discharge of C1216 and Cl 21 7 ; C1216 and C1217 dis- 
charge slowly through R1221. The discharge time-constant 
of Cl 21 6, Cl 21 7, and R1221 is about equal to the 



3-50 



REV JUN 1981 
















Theory of Operation — 7844/R7844 Service 




COMPARTMENTS 

1676-15 



Fig. 3-37. Detailed block diagram of Converter/Rectifiers circuit. 



thermistor thermal-recovery time. This ensures sufficient 
thermistor resistor resistance to limit the turn-on surge cur- 
rent to a safe level. Since Cl 21 6 and Cl 21 7 discharge slow- 
ly, dangerous potentials exist within the power supply for 
several minutes after the POWER switch is turned off. The 
presence of voltage in the circuit is indicated by the relax- 
ation oscillator R1219, C1219, and DS1219. Neon bulb 
DS1219 will blink until the potential across Cl 21 6 and 
Cl 21 7 drops to approximately 80 V. 



El 208 and El 21 3 are surge-voltage protectors. When 
the Line Selector switch is in the 115-volt position, only 
El 208 is connected across the line input. If a peak voltage 
greater th an 230 V is present on the line, El 208 will break 
down and demand high current. This excess current will 
quickly open line fuse FI 200 to interrupt the input power 
before the instrument can be damaged. In the 230-volt posi- 
tion, El 208 and El 21 3 are connected in series across the 
line input to provide proitection for peak voltages greater 
than 460 V. 



Transformer T1 208 provides a sample of the line voltage 
to the plug-in connectors in the Main Interface circuit for 



internal triggering at line frequencies. This line-frequency 
signal is also connected to the Inverter control stage to indi- 
cate when line voltage is applied and the POWER switch is 
on. 



Start Network 

Voltage divider R1210 and R1242 is connected between 
the input line (ac) and the negative side of Cl 21 7 (through 
T1225). The voltage across R1242 charges Cl 242 on each 
half cycle of the input line voltage. When the charge on 
Cl 242 reaches approximately 32 V, trigger diode CR1238 
conducts and Cl 242 is discharged through CR1238 to pro- 
vide base drive to turn on Q1241 through Cl 239. When 
Q1241 is turned on, it shock-excites series-resonant net- 
work LI 237 and Cl 237 to generate a damped oscillation. 
This damped oscillation provides the drive necessary to 
start the Inverter switching action. After the Inverter is oper- 
ating, the recurrent waveform at the collector of Q1241 
keeps Cl 242 discharged through CR1242. This disables the 
Start Network while the instrument is on. 



REV JUN 1981 



3-51 





Theory of Operation — 7844/R7844 Service 



Inverter 

The Inverter stage converts the dc output of the Line 
Input stage to a sine-wave current to drive Power Trans- 
former T13 I0. Once the Inverter has been started by the 
Start Network, transformer T 1 230 provides feedback to the 
bases of Q1234 and Q1241 to sustain oscillation. The polar- 
ity of the windings causes Q1234 and Q1241 to switch al- 
ternately (i.e., only one transistor on at a time). These 
transistors operate at a forced beta of 4 due to the turns 
ratio of T1230. Also, T1230 provides an input from the In- 
verter Control and Regulator stages for pre-regulation and 
fault protection. This is accomplished by effectively short- 
circuiting orie-half of the 60-turn, center-tapped windings to 
either delay the turn-on of Q1234 and Q1241 or to com- 
pletely stop their switching action. 



The switching action of Q1234 and Q1241 generates a 
square-wave voltage at the emitter of Q1234 with an ampli- 
tude approximately equal to the dc voltage at the input to 
this stage. The square-wave voltage at the emitter of Q1234 
supplies the drive necessary to maintain a sine-wave current 
in the series-resonant network of LI 237 and Cl 237. Diodes 
CR1234 and CR1241 provide reverse-conduction paths 
across Q1234 and Q1241 , respectively, when these transis- 
tors are held off for pre-regulation. 



To aid in understanding circuit operation, Fig. 3-38 
shows a representation of the Inverter stage as a switch. 
The three possible states of the Inverter are depicted by the 
three possible switch positions: Q1234 is on in position (a); 
Q1 241 is on in position (c); or both transistors are helf off for 
pre-regulaton in position (b). In the composite current 
waveform of Fig. 3-38, the relative phase and amplitude of 
each component of i { is shown for periods T , T , and T 
corresponding to the three switch positions or the three 
states of the Inverter. The idealized voltage waveforms in 
Fig. 3-38C and Fig. 3-38D show the relationship of their 
amplitude to the dc input voltage and their phase with re- 
spect to the current waveform of Fig. 3-38B. 



The normal sequence of operation is as follows: Assume 
that l ( is passing through zero and is increasing in the direc- 
tion to cause CR1234 to conduct. At zero crossing, the 
Regulator stage (Q1252) is turned on to hold off Q1234 and 
Q1241 ; CR1234 is forward biased to conduct I as shown in 
Fig. 3-38B. After zero crossing, at a time determined by the 
Inverter Control stage, the Regulator allows Q1241 to con- 
duct and reverse bias CR1234. Transistor Q1241 conducts 
as l 2 goes through its peak and back to zero. At zero cross- 
ing, with current increasing in the opposite direction, the 
Regulator is turned on to hold off Q1234 and Q1241 . During 
this pre-regulation hold-off time, CR1241 conducts l 3 . When 
the Regulator is turned off, Q1234 is turned on to conduct I 
and reverse bias CR1241. Transistor Q1234 conducts as I 
goes through its peak and back to zero. The cycle then 
repeats itself. 



The Inverter operates on the low side of the resonant 
frequency of LI 237 and Cl 237, which is approximately 
29 kHz. Pre-regulation is achieved by varying the hold-off 
time of the Inverter transistors (T in Fig. 3-38B) and thereby 
varying the Inverter frequency. The power delivered to 
T1310 varies with the Inverter frequency, because the im- 
pedance of the series-resonant network varies with frequen- 
cy. At the lowest line voltage and highest load, the Inverter 
will operate at a frequency close to the resonant frequency. 
If either the line voltage is increased or the load is reduced, 
the Inverter frequency will decrease. 



Over-Voltage Stop 

The Over-Voltage Stop stage stops the Inverter when- 
ever the voltage across the primary of T1310 exceeds a 
safe level to protect Inverter components from damage. 
This stage is activated whenever the normal voltage regulat- 
ing path through Q1252 and T1230 is inoperative. 



Capacitor Cl 243 is charged through CR1244 to the peak 
of the voltage across the primary of T1310. If this voltage 
exceeds a safe level, VR1246 conducts to trigger SCR 
Q1248 into its forward-conduction state. Then, Cl 243 dis- 
charges through R1248, Q1248, and the base-emitter junc- 
tion of Q1246. This discharge current turns on Q1246 to 
effectively short-circuit the base-drive winding of T 1 230 and 
stop the Inverter switching action. Since CR1249 becomes 
forward biased when Q1248 is triggered on, R1245 and 
Cl 243 are effectively paralleled with Cl 242 in the Start Net- 
work. The relatively large capacitance of Cl 243 prevents 
Cl 242 from charging to the breakdown voltage of CR1238, 
thus preventing the Start Network from turning the Inverter 
on. Transistors Q1248 and Q1246 continue to conduct until 
the discharge current of Cl 243 drops below the holding cur- 
rent of Q1248. After Q1248 returns to its forward-blocking 
state, CR1249 remains forward biased to inhibit the Inverter 
Start Network while Cl 243 is charged through R1247. 
When the charge on Cl 243 is sufficient to reverse bias 
CR1249, the Start Network can start the Inverter. 



Inverter Control 

The Inverter Control stage, made up of primarily U1275, 
provides pre-regulation and fault protection for the low- and 
high-voltage power supplies. For pre-regulation purposes, 
U1275 provides the Regulator output to the Regulator stage 
to vary energy delivered by the Inverter by varying the fre- 
quency. Fault protection is achieved through the Regulator 
output (as for pre-regulation) or by providing the Stop Trig- 
ger output to the Inverter Stop stage to turnjhe Inverter off. 



Integrated circuit U1275 includes a variable pulse-width 
monostable multivibrator initially triggered by current-phase 
information fed back from the Inverter. The charge ramp for 
the multivibrator is available at pin 12 of U1275. The time 



3-52 



REV JUN 1981 




Theory of Operation — 7844/R7844 Service 




Fig. 3-38. (A) Representation of Inverter stage. Idealized waveforms of (B) Total Inverter current l ( , (C) voltage at junction of CR1234 
and CR 1 241 , and (D) voltage across primary of T1 3 1 0. 

constant of R1300 and Cl 330 determines the rate-of-rise of Pre-Regulator. The Pre-Regulator portion of U1275, in 

the charge ramp. The sensing inputs to U1275 determine conjunction with the Regulator stage, maintains constant 

the pulse width of the charge ramp (i.e., the multivibrator on voltages at the outputs of the Low- and High-Voltage 

time). The pulse width of the charge ramp corresponds to Rectifiers, 

the Inverter hold-off time (T , in Fig. 3-38B). The Multi- 
vibrator Regulator output drives the Regulator stage 

through pin 9 of U1275. Under normal operating conditions, Transformer T1235 provides Inverter power and phase 

only the E: Sense input at pin 15 has control over the output information to U1275. The phase information is connected 

pulse width for pre-regulation. However, an error detected to the trigger input of the Inverter Control Multivibrator via 

by any of the sensing inputs will affect the output pulse pins 10 and 11 through Cl 275 and Cl 276. Bridge rectifier 

width and will also produce a Stop Trigger to the Inverter CR1280, CR1281, CR1282, and CR1283, provides positive 

Stop stace. The operation of each individual function of the and negative operating voltages to U1275. A shunt regula- 

Inverter Control stage is described in the following tor in U1275 regulates the +7.5 V output of the bridge recti- 

discussion. tier connected to pin 6. The -2V (nominal) output 



REV JUN 1981 



3-53 








Theory of Operation — 7844/R7844 Service 



connected to pin 7 is unregulated. Zener diode VR1297 pro- 
vides a stable reference voltage for the sensing-divider re- 
sistors R1292, R1293, R1294, R1296, and R1297. Resistor 
R1 293 in this divider adjusts the voltage level at the E Sense 
input to the Pre-Regulator (pin 15 of U1275) to set the out- 
put voltage of the rectifiers by controlling the + 1 30 V Sup- 
ply. The ou tput of the other supplies is set by the turns ratio 
of T1310. 



In the stable state of the Inverter Control multivibrator, 
the Regulator output at pin 9 is near ground to turn off the 
Regulator stage. After the Inverter current passes through 
zero, either pin 10 or pin 11 will go positive to trigger the 
Inverter Control multivibrator on. While the multivibrator is 
on, the Regulator output voltage level is positive to turn on 
the Regulator stage. The duration of the on stage is deter- 
mined by the voltage level at the E Sense input at pin 1 5. If 
this voltage! level is low, the duration is short. As this voltage 
level increases, the duration increases. 



Fault Protection. The fault-protection portions of U1275 
provide protection for the power-supply components from 
damage due to short circuits, turn-on surge currents, and 
other malfunctions. When a fault is detected at the Balance 
or I (current) Sense inputs (pins 2 and 13, respectively), a 
current output from the Sample Period Timer output (pin 1 ) 
charges Cl 264. If the detected fault lasts longer than ap- 
proximately 15 ms, Cl 264 will charge positive enough to 
produce a positive Stop Trigger output at pin 8 to turn the 
Inverter off. When the Inverter is shut off, the current charg- 
ing C1264 is interrupted and C1264 will discharge. Once pin 
8 goes pos itive, Cl 259 discharges through R1261 and the 
base-emitter junctions of Q1254 and Q1252. The discharge 
of Cl 259 keeps Q1254 and Q1252 turned on, and the In- 
verter turned off, for approximately 250 ms. After this peri- 
od, pin 8 returns to a near zero-volt level, turning off Q1254 
and Q1252 to allow the Inverter to run. This cycle repeats 
until the fault is corrected, with the Inverter on for approxi- 
mately 15 ms, then off for approximately 250 ms. 



Inverter Current Limiter. The Inverter Current Limiter 
provides protection for the Inverter components from dam- 
age due to excessive current. Operation of this stage is 
similar to the Pre-Regulator (voltage regulation). The Invert- 
er Current Limiter takes control of the Inverter Control Reg- 
ulator output pulse width during trurn-on or whenever an 
overload causes the Inverter current to reach the limit value. 



R1287 is the current-sensing resistor. The voltage at the 
junction of R1287, R1286, and CR1288 is the negative recti- 
fied Inverter current. The I Sense input at pin 1 3 is normally 
held posit ve through R1285. If the Inverter current in- 
creases, the voltage at the I Sense input will become more 
negative. The Inverter Control Regulator output pulse width 
(i.e., Inverter hold-off time) increases until the Inverter cur- 
rent reaches a level that will hold pin 1 3 near the zero-volt 



level. If the voltage at pin 13 remains near zero for more 
than approximately 15 ms, the Stop Trigger output at pin 8 
will go positive to trigger the Inverter Stop stage. The Invert- 
er Current Limiter will limit the peak Inverter current to about 
5 A under fault conditions. 



Balance. The Balance portion of U1275 provides over- 
load protection for the Low- and High-Voltage Rectifiers by 
sensing a malfunction in these circuits. Beam I (current) 
Sense and I (current) Sense inputs from the CRT Circuit and 
outputs from the Low-Voltage Rectifiers are applied to the 
Balance Sense input at pin 2 of U1275 through divider 
R1302, R1304, and R1305. During normal operation, this 
divider biases the Balance Sense input near a zero-volt lev- 
el. If one of the inputs changes sufficiently to cause the volt- 
age level at pin 2 to vary approximately 200 mV (positive or 
negative) for more than approximately 1 5 ms, a positive 
Stop Trigger output is produced at pin 8 of U1275. 



Line Stop. The Line Stop portion of U 1275 protects the 
Line-input components from damage due to turn-on surge 
current. This is achieved by triggering the Inverter Stop 
stage to stop the Inverter when the POWER switch is 
turned off. The Line Stop stage will also stop the Inverter if 
the ac line voltage falls below a minimum value. 



The line-frequency signal from transformer T 1 208 is con- 
nected to the Line stop Sense input of U1275 at pin 4. Dur- 
ing normal operation, the line-frequency signal causes the 
Line stop Timer terminal (pin 3) to be near a zero-volt level 
(ground). This zero-volt level keeps Cl 267 from being 
charged toward +7. .5 V through R1267. When the line-fre- 
quency signal is interrupted or falls below a minimum value, 
Cl 267 will begin to charge to +7.5 V. When the voltage at 
pin 3 reaches approximately +0.7 V, the Line Stop stage 
will produce a positive output at pin 8 of U1275 to trigger 
the Inverter Stop stage. 



Regulator 

The Regulator stage operates in conjunction with the In- 
verter Control and Inverter Stop stages to regulate the In- 
verter switching. Transistor Q1252 acts as a switch 
controlled by the Regulator output of U1275 (pin 9) or by the 
Inverter Stop stage. When Q1252 is turned on, CR1251 or 
CR1252 is forward biased. This effectively short circuits 
onel-half of the 60-turn, center-tapped winding of T1230 to 
shut off the Inverter. For further information, see the discus- 
sion of the Inverter stage. 



Inverter Stop 

The Inverter Stop stage, Q1254, is controlled by the out- 
put of U1275 (pin 8) to shut off the Inverter through the 
Regulator stage (Q1252). During the start period, T1230 
supplies current to charge Cl 256 and Cl 259 through 



3-54 



REV JUN 1981 




Theory of Operation — 7844/R7844 Service 



CR1256 and CR1259. Also during this time, Q1254 is re- 
verse biased by U1275. Once triggered on by a positive 
level at pm 8 (U1275), Q1254 will stay on while Cl 256 and 
C1259 discharge through the base of Q1254. If U1275 is 
removed from its socket oris otherwise nonfunctional, the 
Inverter Stop stage will stop the Inverter after about two or 
three Inverter cycles. 



Low-Voltage Rectifiers 

The rectifiers and filter components in the secondaries of 
T1310 provide rectified, pre-regulated voltages for re-regu- 
lation by the Low- Voltage Regulators circuit. 



Low-Voltage Regulators 

The Low-Voltage Regulators convert semi-regulated 
voltages from the Converter/Rectifiers circuit to stabilized, 
low-ripple output voltages. The regulators are series type, 
using the -50 Volt Supply as a reference for the remaining 
voltage supplies. Figure 3-39 shows a detailed block dia- 
gram of Ihe Low-Voltage Regulators circuit. A schematic is 
provided on diagram 19. 




-50 Vollt Supply 

Semi-regulated - 54 V from the Converter/Rectifiers cir- 
cuit provides the unregulated voltage source for this supply. 
Transistors Q1508, Q1522, and Q1534 operate as a 
feedback -stabilized amplifier to maintain a constant -50 V 
output level. Transistor Q1508 is connected as a differential 
amplifier to compare the feedback voltage at the base of 
Q1508B against the reference voltage at the base of 
Q1508A. The error output at the collector of Q1508B re- 
flects the difference, if any, between these two inputs. The 
change in error output level at the collector of Q1508B is 
always in the opposite direction to the change in the 
feedback input at the base of Q1508B. 



Regulation of the supply occurs as follows: If the output 
level of this supply decreases (becomes less negative) due 
to an increase in load or a decrease in input voltage (as a 
result of line-voltage changes or ripple), the voltage across 
divider R1512, R1513, and R1514 decreases also. This re- 
sults in a more positive level at the base of Q1508B than 
that established by the - 50 V Reference stage at the base 
of Q1508A. Since the transistor with the more positive base 
controls the conduction of the differential amplifier, the out- 
put current at the collector of Q1508B increases. This in- 
crease in output from Q1508B causes an increase in current 
through Q1522. This allows more current to flow through 
Q1534, resulting in increased conduction of Q1538, the 

- 50 V Series Regulator. The load current increases and the 
output voltage of this supply also increases (becomes more 
negative). As a result, the feedback voltage from the -50 V 
Sense line increases and the base of Q1508B returns to the 
same level as the base of Q1508A. Similarly, if the output 
level of this supply increases (more negative), the output 
current of Q1508B decreases. The feedback through Q1522 
and Q1534 reduces the conduction of the —50 V Series 
Regulator to decrease the output voltage of this supply. The 

— 50 V adjustment, R1513, sets the output level of this 
supply. 



The -50 V Current Limiting stage (Q1256) protects the 
-50 Volt Supply if excess current is demanded from this 
supply. Since the load is connected to this supply through 
R1537, all current from the —50 Volt Supply must flow 
through this resistor. Transistor Q1526 senses the voltage 
drop across R1537. Under normal operation there is insuffi- 
cient voltage drop across R1537 to forward bias Q1526. 



When excess current is demanded from the -50 V Se- 
ries Regulator due to a short circuit or similar malfunction at 
the output of this supply, the voltage drop across R1537 
increases until it is sufficient to forward bias Q1526. The 
collector current of Q1526 results in a reduction of current 
through Q1 522 and Q1 534 to limit the conduction of Q1 538. 
This current limiting protects Q1538 from damage due to 
excess power dissipation. 



Zener diode VR1505 sets a reference level of approxi- 
mately -9 V at the base of Q1 508A. A sample of the output 
voltage from the —50 Volt Supply is connected to the base 
of Q1508B through divider network R1512, R1513, and 
R1514. Flesistor R1513 in this divider is adjustable to set 
the output level of this supply. Notice that the feedback volt- 
age to ttiis divider is obtained from a line labeled -50 V 
Sense. If the feedback voltage were obtained at the supply, 
the voltage at the load would not stay constant, due to the 
inherent resistance of the interconnecting cable between the 
supply arid its load (as the load current varies, the voltage 
drop alor g the cable also varies). The Sense configuration 
overcomes this problem by sensing the voltage at the load. 
Since the current in the Sense line is small and constant, the 
load voltage is held constant regardless of the load current. 



Several protection diodes are also included in this circuit. 
Diode CR1539 preventss the output of this supply from go- 
ing more positive than about +0.6 V if it is shorted to a 
positive supply. Diodes VR1501 and CR1502 supply a turn- 
on voltage for Q1 508 to start the - 50 Volt Supply when the 
instrument is first turned on. As soon as the -50 Volt Sup- 
ply turns on, CR1502 turns off to disconnect the turn-on 
voltage to Q1508. 



— 1 5 Volt Supply 

Basic operation of all stages in the - 1 5 Volt Supply is 
the same as for the -50 Volt Supply. Reference level for 
this supply is established by divider R1463 and R1464 be- 



REV JUN 1981 



3-55 




Theory of Operation — 7844/R7844 Service 



SEMI-REGULATED 
+54 VOl-TS 



SEMI-REGULATED 
-54 VOLTS 



+50-VOLT 

SERIES 

REGULATOR 

Q1428 



-50-VOLT 

SERIES 

REGULATOR 

Q1538 



-50-VOLT CURRENT 
LIMITING Q1526 



+50-VOLT 
FEEDBACK 
AMPLIFIER 
Q1 409-Q141 5 
Q1425 



-50-VOLT 
FEEDBACK 
AMPLIFIER 




+50-VOLT 

CURRENT 

LIMITING 

Q1418 



MOTOR 



FAN 

CIRCUIT 



SEMI-REGULATED 
+17 VOLTS 




GRAT 

ILLUM 



GRATICULE 
■ LIGHT SUPPLY 
Q1546 
Q1550 



+1 5-VOLT 



CURRENT 



LIMITING 

Q1445 



SEMI-REGULATED 
+7 VOLTS ►- 



+5- VOLT 
CURRENT 
LIMITING ' 
Q1576 



+5- VOLT 
SERIES 
REGULATOR 
Q1588 



SEMI-REGULATED 
-17 VOLTS 



-15-VOLT 

SERIES 

REGULATOR 

Q1498 



R1498 -15 V 



+5- VOLT 
FEEDBACK 
AMPLIFIER -< 
Q1 560-Q1 582 
01585 



-15-VOLT 
FEEDBACK 
AMPLIFIER s 
Q1466-Q1485 
Q1496 



\ -15-VOLT 
N CURRENT 
LIMITING 
-50 V Q1489 



Fig. 3-39. Detailed block diagram of Low-Voltage Regulator circuit. 



REV JUN 1981 

















Theory of Operation — 7844/R7844 Service 



tween ground and the -50 V Sense voltage. The divider 
ratio of R 1463 and R1464 sets a level of -15 V at the base 
of Q1466A. The level on the —50 V Sense line is held stable 
by the -50 Volt Supply. Any change at the output of the 
— 15 Volt Supply appears at the base of Q1466B as an er- 
ror signal The output voltage is regulated in the same man- 
ner as described for the -50 Volt Supply. Diode CR1499 
limits the output of this supply from going more positive 
than approximately +0.6 V if it is shorted to one of the 
more positive supplies. Diodes CR1468 and CR1469 pro- 
vide reverse voltage protection for transistors Q1466B and 
Q1466A, respectively. 



+ 5 Volt Siupply 

The operation of the +5 Volt Supply is basically the 
same as described for previous supplies. The reference level 
for this supply is established by the ground connection at 
the base of Q1560A. Feedback voltage to the base of 
Q1560B is provided by divider R1564 and R1589 between 
the —50 V Sense line and the +5 V Sense line. The divider 
ratio of R 1564 and R1589 is 10:1, so the base of Q1560B is 
at zero volt when the supply is operating normally. The level 
on the -50 V Sense line is held stable by the -50 Volt 
Supply. Therefore, any change at the output of the +5 Volt 
Supply appears at the base of Q1560B as an error signal. 
The output voltage is regulated in the manner described pre- 
viously for the -50 Volt Supply. Diode CR1589 limits the 
output of this supply to approximately -0.6 V if it is shorted 
to one of the negative supplies. 



The +5 V Current Limiting stage (Q1576A and B) pro- 
tects this supply from damage due to a demand for exces- 
sive output current. Transistors Q1576A and Q1576B are 
connected as a comparator to detect excessive current 
through FI1587. With normal supply current through R1587, 
the voltage drop across R1587 is such that the base of 
Q1576B is more positive than the base of Q1576A. There- 
fore, Q1576A is cut off and CR1576 is reverse biased. If the 
current through R1587 increases above a safe level, the 
base of Q1576B becomes more negative than the base of 
Q1576A. Now, Q1576B is cut off and Q1576A conducts. 
The collector current of Q1576A forward biases CR1576 
and decreases the voltage on the base of Q1582. This limits 
the conduction of Q1588 to a safe current level. 



+ 15 Volt Supply 

The 4 15 Volt Supply regulates in the same manner as 
the -50 Volt Supply; current limiting operates in the man- 
ner described for the +5 Volt Supply. The ground connec- 
tion at the base of Q1436A provides the refrence for this 
supply. Feedback voltage to the base of Q1436B is pro- 
vided through divider R1440 and R1459 between the -50 V 
Sense line and the +15 V Sense line. The divider ratio of 
R1440 and R1459 sets the base of Q1436B at zero volt. 
Any charge in the output level of the +15 Volt Supply ap- 
pears at the base of Q1436B as an error signal. This results 



in an opposite change at the collector of Q1436B and at the 
base of Q1451. This change is connected to the +15 V 
Series Regulator stage through Q1455 to correct the error 
in the output voltage of the supply. 



Diode CR1439 protects Q1436B against negative 
voltages if the +15 Volt Supply is shorted to ground. Diode 
CR1459 limits the output of this supply to approximately 
-0.6 V if it is shorted to one of the negative supplies. 



+ 50 Volt Supply 

Operation of the +50 Volt Supply is basically the same 
as described for the -50 V Supply; current limiting oper- 
ates in a similar manner as described for the +5 V Supply. 
Reference voltage for this supply is established by the 
ground connection through R1406 at the base of Q1409A. 
Feedback voltage to the base of Q1409B is provided by 
divider R1412 and R1429 between the -50 V Sense line 
and —15 V Sense line. The divider ratio of R1412 and 
R1429 sets the base level of Q1409B at zero volt when the 
output of this supply is correct. The protection diodes in this 
circuit operate similar to those in the other supplies. 



Fan Circuit 

The fan motor used in this instrument is a brushless dc 
motor using Hall Effect devices. The two Hall Effect devices 
sequentially drive the four transistors (U2536A, B, C, and D) 
which, in turn, control the current flow through the four field 
windings. The fan motor speed is regulated by limiting the 
current flow through Q2512. Diodes CR2528, CR2537, 
CR2532, and CR2534 rectify the back emf (electromotive- 
force) produced by the four field windings. This voltage is 
applied to the base of Q2512 through divider network 
R2527 and R2525. The voltage developed by this circuit is 
proportional to the motor speed. If the motor speed starts to 
increase, the current drive to the base of Q2512 will de- 
crease, reducing the current to the motor. If the motor 
speed starts to decrease, the current to the motor will in- 
crease, thereby maintaining a constant motor speed. 



Graticule-Light Supply 

The Graticule-Light Supply provides voltage to the 
graticule lights DS1552, DS1553, and DS1554. The front- 
panel GRAT ILLUM control, R1541, sets the output of this 
supply to set the brightness of the graticule lights. Transis- 
tors Q1 546, Q1 550 and diode CR1 549 form a pseudo differ- 
ential amplifier, the output voltage at the collector of Q1 550 
follows the voltage set at the base of Q1546 by the divider 
made up of R1544, R1545, R1543, and the GRAT ILLUM 
control R1541 (see diagram 1). Resistor R1551 limits the 
output current from this supply to protect Q1550 from dam- 
age due to a short circuit. 



REV JUM 1981 



3-57 




Theory of Operation — 7844/R7844 Service 

Enhancement Level 

The 20 ms gate from pin 1 of U41 1 5 turns Q41 1 2 off and 
Q4124 on. Then, Enhancer Preset adjustment R935 con- 
trols the brightness of the Enhancer raster display. 



Z-Axis Inhibit 



Enhancer 2:0 ms Gate 

The output of the Enhancer 20 ms Gate stage deter- 
mines the tength of time that the Enhancer circuit generates 
necessary s ignals to develop the raster display on the crt. A 
negative-going signal from the Readout Single Shot input 
line initiates a positive-going 20 ms gate at pin 6 of U41 1 5 
and a negative-going 20 ms gate a pin 1 of U4115. 



The Z-Axis Inhibit signal blanks the normal beam 2 crt 
display to prevent interference with the raster display and 
readout display. The 20 ms gate from pin 1 of U4115 
causes the collector of Q4145 to go HI; Q4150 then turns 
on and pulls the Z-Axis-Inhibit line LO. The Z-Axis-Inhibit is 
also controlled by the output of the Readout 20 ms Delay 
circuit during the time pin 6 of U4131 is positive, Q4150 is 
on, and the Z-Axis Inhibit line is pulled LO. A LO level on the 
Z-Axis Inhibit line prevents the Beam 2 Horizontal plug-in 
unit from unblanking the beam 2 crt display. 



Enhancer (Option 22) 

The Enhancer circuit effectively increases the writing rate 
for single-shot photographs. Figure 3-40 shows a detailed 
block diagram of the Enhancer circuit, and a schematic is 
shown on diagram 20 in the Diagrams section of this 
manual. 




Z-READOUT 
SIGNAL FFOM 



READOUT 

SYSTEM 




READOUT 

SINGLE 



SHOT SIGNAL 



FROM S\ 



Z-AXIS 



INHIBIT 
SIGNAL FFIOM 



READOUT 

SYSTEM 



O 



X-Y INHIBIT 
SIGNAL FFIOM 



READOUT 

SYSTEM 



O 



Y READOUT 
SIGNAL FROM 



READOUT 

SYSTEM 



<$> 



X-READOUT 
SIGNAL FROM 



READOUT 

SYSTEM 



< 6 > 




Z-READOUT SIGNAL 
TO BEAM 2 Z-AXIS 
AMPLIFIER /v 



READOUT SINGLE 
SHOT SIGNAL TO 
READOUT SYSTEM 



Z-AXIS INHIBIT 
SIGNAL TO BEAM 2 
Z-AXIS LOGIC /\ 





Y-READOUT 
SIGNAL TO 
BEAM 2 
VERTICAL 
AMPLIFIER 

<$> 



X READOUT 
SIGNAL TO 
BEAM 2 
HORIZONTAL 
AMPLIFIER 

< 3 > 




( 1676 - 85 ) 1676-192 



Fig. 3-40. Detailed block diagram of the Enhancer circuit (Option 22). 



3-58 



REV JUN 1981 








Theory of Operation — 7844/R7844 Service 



X Sawtooth 

The X-Sawtooth stage generates sawtooth signals to 
provide horizontal deflection for the Enhancer raster scan. 
This circuit generates sawtooth signals at a repetition rate 
of approximately 1 kHz during the time that pin 1 of U4115 
is LO. When pin 1 of U41 15 goes LO, the collector of Q4154 
goes LO enabling Q4158 and Q4160 to operate as a free- 
running multivibrator. Transistors Q4158 and Q4160 alter- 
nately turn off and on. During the time that Q4160 is off, the 
voltage at the collector of Q4163 charges negative at a rate 
determined by the RC time constant of C4162 and R4161. 
When Q4160 is on, Q4163 discharges C4162, which corre- 
sponds to the retrace time of the raster scan. 



Y Sawtooth 

The Y-Sawtooth stage generates sawtooth signals to 
provide vertical deflection for the Enhancer raster scan. This 
circuit operates the same as the X-Sawtooth stage except 
that the Y-Sawtooth stage generates sawtooth signals at a 
repetition rate of approximatley 1 MHz. 



Readout 20 ms Delay 

The Readout 20 ms Delay stage delays the readout dis- 
play until after the Enhancer circuit completes the enhance- 
ment raster. A negative-going signal from J4192B initiates 
the readout display. This signal occurs 20 ms after pin 6 of 
U4115 goes LO. 



Enhancer Mode Switching 

The X-Redout and Y-Readout signal lines are used by 
the ENHANCER circuit for access to the crt deflection sys- 
tem. The Enhancer Mode Switch connects the output sig- 
nals from the X-Sawtooth and Y-Sawtooth circuits tothe X- 
Readout and Y-Readout signal lines during the Enhancer 
20 ms Gate pulse. At the end of the Enhancer 20 ms Gate 
pulse the X-Readout and Y-Readout signal lines are 
reconnected for use by the readout system. 



X-Y Inhibit 

The X-Y Inhibit signal prevents the beam 2 vertical and 
horizontal signals from being displayed on the crt during the 
time that readout information is displayed or when the 
Enhancer circuit is operating. 



REV JUN 1981 



3-59 




Section 4 — 7844/R7844 Service 



PERFORMANCE CHECK 



This procedure is to be used for the 7844/R7844 as a check of instrument performance. Completion of each step in the 
procedure ensures that the instrument is correctly operating within all given tolerances. Refer to the following discussion for 
instructions on complete or partial performance checks. 



PRELIMINARY INFORMATION 



Performance Check Interval 

To maintain instrument accuracy, check the performance 
of the 7844/R7844 every 1000 hours of operation, or every 
six months if used infrequently. Thoroughly clean and in- 
spect this instrument as outlined in the Maintenance 
Section. 



Tektronix Field Service 

Tektronix, Inc. Field Service Centers and Factory Service 
Centers provide instrument repair and readjustment ser- 
vices. Contact your Tektronix Field Office or representative 
for further information. 



Using This Procedure 

Completion of this procedure will check the performance 
of the standard 7844/R7844 and instruments with options. 
When portions of this procedure do not apply to an instru- 
ment with an option, a note will appear at the beginning of 
the step (e.g. Omit with Option 21). The Set-Up Information 
will include control settings for the 7844/R7844 standard 
model and instruments with options. 



Index 

To aid in locating procedure steps, an index precedes the 
Performance Check Procedure. 



Partial Procedures 

The following procedure is written to completely check 
the 7844/R7844 to the Performance Requirements listed in 
Table 4-2. If the applications for which you will use 
the7844/R7844 do not require the full available performance 
from the 7844/R7844 and plug-in combinations, the proce- 
dures and the required equipment list can be shortened ac- 
cordingly. For example, the basic low-frequency 
measurement capabilities of this instrument can be verified 
by just checking vertical deflection accuracy and basic hori- 
zontal timing with 7000-Series real-time plug-in units and 
the 7844/R7844 calibrator signal. 



A partial performance check may be desirable after re- 
placing components, or to check the adjustment of a portion 
of the instrument. To check only part of the instrument, refer 
to the Equipment Required list preceding the portion to be 
performed. 



Performance Check Summary 

Table 4-2, Performance Check summary, lists the electri- 
cal specifications that are checked in this section. Table 4-2 
is intended to provide a convenient means for locating the 
procedures that check instruments to meet the applicable 
electrical specifications. 



TEST EQUIPMENT REQUIRED 

The test equipment listed in Table 4-1 is required for a 
complete performance check of this instrument. Specifica- 
tions given in Table 4-1 for test equipment are the minimum 
required to meet those specifications (listed in the Specifica- 
tion section). Detailed operating instructions for test equip- 
ment are omitted in this procedure. Refer to the test 
equipment instruction manual if more information is needed. 



Special Calibration Fixtures 

Special calibration fixtures are used only where they fa- 
cilitate the instrument performance check. These fixtures 
are available from Tektronix, Inc. Order by part number from 
Tektronix Field Offices or representatives. 



Performance Check Equipment Alternatives 

Test equipment listed in the Examples of Applicable Test 
Equipment column, Table 4-1, is required for this Perfor- 
mance Check. The Performance Check Procedure is based 
on the first item of equipment given as an example. If other 
equipment is substituted, control settings or performance 
check setups may need to be altered. If the exact item of 
equipment given as an example is not available, refer to the 
Minimum Specifications column to determine if other equip- 
ment may be substituted. Then check the Usage column. If 
you determine that your measurement requirements will not 
be affected, the item and corresponding step(s) can be 
deleted. 



REV JUN 1981 



4-1 




Performance Check — 7844/R7844 Service 



Signal Connections 

Detailed signal-connection information is not provided 
except when critical for a particular test. Rear-panel output 
connectors should be connected to other equipment with 



50 £> bnc cables. When simultaneously connecting a signal 
to two inputs, use a bnc T connector. For test equipment 
signal-connection and termination information, refer to the 
test equipment instruction manuals. 



Table 4-1 

TEST EQUIPMENT 



Description 


Minimum Specifications 


Usage 


Examples of 
Applicable 
Test Equipment 


Precision dc voltmeter 


Range, -75 to +150 V; ac- 
curacy, within 0.2% 


Calibrator output accuracy 
check and adjustment. Power 
supply voltages, check and 
adjustment. Z-Axis and Dis- 
play check and adjustment. 


a. TEKTRONIX DM 501 A Digital 
Multimeter 3 

b. Fluke Model 825A Differential 
DV Voltmeter 


Time-mark generator 


Marker outputs, 2 ns to 0.1 s; 
marker accuracy, within 
0.1%; trigger output, 1 ms. 


Crt geometry check and ad- 
justment. Horizontal timing 
check and adjustment. Cali- 
brator frequency check and 
adjustment. 


TEKTRONIX TG 501 Time-Mark 
Generator 3 


Medium-frequency 
signal generator 


Frequency range from 

2.5 MHz to 100 MHz with 
50 £2 output; output ampli- 
tude, 1 V p-p; accuracy, with- 
in 2%. 


Z-Axis input check. 


a. TEKTRONIX SG 503 Leveled 
Sine Wave Generator 3 

b. General Radio 1215-C with 
1 263-C Amplitude Regulating 
Power Supply. 


High-frequency signal 
generator 


Frequency, 220 MHz to 
500 MHz; reference frequen- 
cy, 10 MHz or lower; output 
amplitude, variable from 0.5 
to 4 V; amplitude accuracy, 
constant within 1% of refer- 
ence as output frequency 
changes. 


Vertical bandwidth check. 
Vertical channel isolation 
check. 


TEKTRONIX SG 504 Leveled 
Sine Wave Generator 


Amplifier unit 


TEKTRONIX 7A-Series (500 
MHz bandwidth required for 
Vertical system 400 MHz 
Gain check) plug-in unit. 


Used throughout procedure 
to provide vertical input to the 
instrument being checked. 


TEKTRONIX 7A1 9 Amplifier unit. 


Amplifier unit (dual) 


Any 7A-Series dual display 
amplifier unit. 


Used to check position and 
operation of READOUT dis- 
play. 


Any 7A-Series dual amplifier unit 
(may be shared with a 7000-Se- 
ries test oscilloscope. 



4-2 



REV JUN 1981 




Performance Check — 7844/R7844 Service 



Table 4-1 (cont) 



Description 


Minimum Specifications 


Usage 


Examples of 
Test Equipment 


Time-base unit 


TEKTRONIX 7B80-Series; 
delaying unit needed for 
checking DLY’D gate out 
(7B85). 


Used throughout procedure 
to provide sweep (delaying 
time base). 


a. TEKTRONIX 7B85 Time 
Base. 

b. TEKTRONIX 7B80 Time 
Base. 


Sampling unit 


Bandwidth, dc to 1 GHz; dif- 
ferential input. 


Used to check trigger aberra- 
tions and trigger bandwidth. 


a. TEKTRONIX 7S14 Dual-Trace 
Delayed Sweep Sampler. 

b. Sampling Heads and Sam- 
pling Sweep. 


Plug-in extender 
calibration fixture 


Provides access to trigger 
signal from horizontal com- 
partment jacks. 


Used to check/adjust trigger 
gain, aberrations, 
and bandwidth. 


TEKTRONIX Calibration Fixture 
067-0589-00. 


Mainframe standardizer 
calibration fixture 


Produces gain-check and 
pulse-response waveforms. 


Used throughout procedure 
to standardize instrument so 
plug-in units can be 
interchanged without com- 
plete readjustment. 


a. TEKTRONIX Calibration Fix- 
ture 067-0587-02. 

b. Calibrated 7000-Series plug-in 
units with suitable signal sources 
may be substituted if lower per- 
formance is acceptable. 


Test oscilloscope 


Bandwidth, dc to 75 MHz; 
minimum deflection factor 
lOmV/div; accuracy, within 
3%. Dual-channel with an in- 
verting input and both added 
and alternate vertical modes. 


Used throughout procedure. 


a. TEKTRONIX 7603 Oscillo- 
scope System with 7A1 8 Amplifi- 
er, 7B53A Time Base, and 
P6053B Probe. 

b. TEKTRONIX 475 Oscilloscope 
with P6106 Probe. 

c. Refer to the Tektronix Catalog 
for compatible oscilloscope 
system. 


T connector 


bnc-to-bnc 


External Z-axis operation 
check. 


Tektronix Part No. 1 03-0030-00. 


Termination 


Imnorlanr'Q Rfl O* artrnrarw 


Oi i+m it torminatinn f r\r cinnal 


TiaHrr»niv D«arf fill fW"MG Hi 




Performance Check— 7844/R7844 Service 



Table 4-2 

PERFORMANCE CHECK SUMMARY 









Performance Check 


Characteristic 


Performance Requirement 


Procedure Title 


Deflection Factor 


Compatible with all 7000-Series plug-in 


FI. Check Beam 1 and Beam 2 Vertical 




units. 




Amplifier Gain. (Option 21 only). 


Accuracy 


1% or less difference between vertical 


F2. Check Beam 1 and Beam 2 Vertical 




compartments. 




Crossover Gain. 


Low-Frequency 


0.1 div or less compression or expansion 


F3. Check Low-Frequency Linearity. 


Linearity 


of a center-screen, 2-div signal positioned 
anywhere vertically within the graticule 






area. 






System Bandwidth 


Varies with plug-in selected. See 7800- 


F5. Check Beam 1 and Beam 2 Vertical 




Series Oscilloscope Systems specifica- 


Amplifier 400 MHz Gain. 




tion. 






Isolation Between Beam 1 and 
Beam 2 








All Vertical Modes 


At least 100:1 from dc to 150 MHz and at 
least 30:1 from 150 MHz to 400 MHz. 


F6. Check Vertical Channel Isolation. 


Vertical Display Modes 


Plug-in compartment controlling vertical 


Does not normally require customer verifi- 




deflection of electron beam. 


cation; substantiated at the factory. 




BEAM 1 


BEAM 2 




7844R7844 


LEFT 


LEFT 






LEFT 


RIGHT 






RIGHT 


LEFT 






RIGHT 


RIGHT 




7844/R7844 
(Option 21 only) 


LEFT 


RIGHT 




Vertical Separation Control Range 
(deleted for Option 21) 




F7. Check Vertical Trace Separation 
Operation. 



TRIGGERING 



Trigger Source 
A HORIZ 


LEFT VERT 
compartment. 


or 


RIGHT 


VERT 


Cl. Check Trigger Selector Operation 


B HORIZ 


LEFT VERT 
compartment. 


or 


RIGHT 


VERT 





HORIZONTAL 



Deflection Factor 


Compatible with all 7000-Series plug-in 
units. 




Accuracy 


1% or less difference between horizontal 
compartments. 


Implicitly checked in steps D1. Check 
Beam 1 Horizontal Amplifier Gain, D3. 
Check Beam 2 Horizontal Amplifier Gain, 
D1 . Check Beam 1 and Beam 2 Horizon- 
tal Amplifier Gain. 



@ 



4-4 




Performance Check — 7844/R7844 Service 



Table 4-2 (cont) 









Performance Check 


Characteristic 


Performance Requirement 


Procedure Title 


Deflection Factor (cont) 


f 






dc Linearity 


0.05 div or less error at each graticule line 


D4. Check Beam 1 and Beam 2 Horizon- 




after adjusting for no error at the second 


tal Amplifier Low Frequency Linearity. 




and tenth graticule lines. 


D2. Check Beam 1 and beam 2 Horizontal 








Amplifier Low-Frequency Linearity. 


Fastest Calibrated Sweep Rate 


1 ns/div. 


D2. Check Beam 1 High Frequency 

Timing. 

D5. Check Beam 2 High Frequency 

Timing. 

E3. Check Beam 1 High Frequency 

Timing. 

E4. Check Beam 2 High Frequency 

Timing. 


Horizontal Display Modes 


^ Plug-in compartment controlling horizon- 


Does not normally require customer verifi- 




tal deflection of electron beam. 


cation; substantiated at the factory. 




BEAM 1 


BEAM 2 






A 


A 






A 


B 






B 


A 






B 


B 




Phase Shift Between Vertical and 






Does not normally require customer verifi- 


Horizontal Deflection Systems 






cation; substantiated at the factory. 


Bandwidth (1 0 div reference) 




Does not normally require customer verifi- 
cation; substantiated at the factory. 


Horizontal Separation Control 


l 




Does not normally require customer verifi- 


Range 






cation; substantiated at the factory. 



DISPLAY 



CRT Graticule 






Type 

Area 


Internal 

8 div vertical by 10 div horizontal. Each 
div equals 1 cm. 


Does not normally require customer verifi- 
cation; substantiated at the factory. 


PULSED modes 






BEAM 2 GATED 


The graticule illumination is triggered at 
the end of each sweep of beam 2. 


A1. Check Graticule Illumination 
Operation. 


MANUAL 


The graticule is illuminated momentarily 
when the MANUAL push button is 
pressed independently of other PULSED 
modes. 




EXTERNAL 

i 

1 


The graticule is illuminated momentarily 
when an appropriate remote signal is ap- 
plied to the rear-panel GRAT/READOUT 
SINGLE SHOT connector. 


Does not normally require customer verifi- 
cation; substantiated at the factory. 



4-5 




Performance Check — 7844/R7844 Service 



Table 4-2 (cont) 







Performance Check 


Characteristic 


Performance Requirement 


Procedure Title 



CALIBRATOR 



Waveshape 

Polarity 


Square wave 

Positive going with baseline near ground. 


B3. Check CALIBRATOR Risetime, 
Falltime, and Duty Cycle. 


Output Voltage 

Into 100 kS2 or greater 


4 mV, 40 mV, 0.4 V, 4 V 


B1 . Check CALIBRATOR Output 

Voltage. 


Into 50 12 


0.4 mV, 4 mV, 40 mV, 0.4 V. 


Substantiated at the factory. 


Output Current 
7844 


40 mA. 


Does not normally require customer verifi- 
cation; substantiated at the factory. 


R7844 


40 mA. 


Repetition Rate 


1 kHz within 0.25%. 


B2. Check CALIBRATOR 1 kHz Repeti- 
tion Rate. 


Duty Cycle 


49.8% to 50.2%. 


B3. Check CALIBRATOR Risetime, 
Falltime, and Duty Cycle. 


Risetime and Falltime 


250 ns or less into 100 pF or less. 



SIGNAL OUTPUTS 



A SAWTOOTH 
Source 


Time-base unit in A HORIZ compartment. 


B4. Check A and B SAWTOOTH Output 
Signals. 


Output Voltage 
Rate of Rise 
Into 50 12 


50 mV/unit of time (selected by time/div 
switch) within 15%. 100 ns/div maximum. 


Substantiated at the factory. 


Into 1 M12 
Paralleled by 1 50 pF 


1 V/unit of time (selected by time-base 
time/div switch) within 10%. 1 /us/div 
maximum. 


B4. Check A and B SAWTOOTH Output 
Signals. 


B SAWTOOTH 
Source 


Time-base unit in B HORIZ Compartment. 


B4. Check A and B SAWTOOTH Output 
Signals. 


Output Voltage 

Rate of Rise 
Into 50 12 


50 mV/unit of time (selected by time/div 
switch) within 15%. 100 ns/div maximum. 


Substantiated at the factory. 


Into 1 M12 

Paralleled by 1 50 pF 


1 V/unit of time (selected by time-base 
time/div switch) within 10%. 1 /us/div 
maximum. 


B4. Check A and B SAWTOOTH Output 
Signals. 



Performance Check — 7844/R7844 Service 



Table 4-2 (cont) 



Characteristic 


Performance Requirement 


Performance Check 
Procedure Title 


A GATE 
Source 

MAIN 

DLY'D 


Main of DLY’d gates from time-base unit 
installed in the A HORIZ compartment. 


B5. Check A GATE MAIN/DLY’D Output 
Signals. 


Output Voltage 
Input 50 Q 


0.5 V within 10%. 


Substantiated at the factory. 


Into 1 Mfi 


1 0 V within 1 0% (up to 1 ^s/div). 


B5. Check A GATE MAIN/DLY’D Output 
Signals. 


B GATE 
Source 


MAIN or DLY'D gates from time-base unit 
installed in the A HORIZ compartment. 


B6. Check B GATE MAIN/DLY’D Output 
Signals. 


MAIN 

DLY'D 






Output Voltage 
Input 50 Q 


0.5 V within 10%. 


Substantiated at the factory. 


Into 1 MS2 


10 V within 10% (up to 1 MS/div). 


B6. Check B GATE MAIN/DLY’D Output 
Signals. 



BEAM 1 and 2 EXTERNAL Z-AXIS INPUT 



Sensitivity 


2 V p-p. Provides trace modulation over 
full intensity range. 


A8. Check External Beam 2 Z-Axis 
Operation. 

A9. Check External Beam 1 Z-Axis 
Operation. 


Polarity of Operation 


Positive-going signal decreases trace in- 
tensity; negative-going signal increases 
trace intensity. 




REMOTE CONNECTORS AND SWITCHES 


CONTROL ILLUMINATION (for 
plug-in units only) 


HIGH, LOW, OFF 


Does not normally require customer verifi- 
cation; substantiated at the factory. 


READOUT DISPLAY 


Mode (front panel) 
Free-run (not marked) 


The alphanumeric readout is continuously 
displayed. 


G. Check Readout Modes. 


PULSED 

BEAM 2 GATED 


The readout display is triggered at the end 
of each sweep of beam 2. 





4-7 



Performance Check — 7844/R7844 Service 



Table 4-2 (cont) 



Characteristic 


Performance Requirement 


Performance Check 
Procedure Title 


Mode (front panel) (cont) 
EXTERNAL 


One readout frame is displayed when an 
appropriate remote signal is applied to the 
rear-panel GRAT/READOUT SINGLE 
SHOT connector. 


Substantiated at the factory. 


MANUAL 


One readout frame is displayed when the 
MANUAL push button is pressed. 


F4. Check Readout Modes. 


Mode (internal switch) 
Free-Run (FR) 


The internal readout mode is dependent 
on the front-panel Readout mode. 




Beam 2 Gated 


The readout display is triggered at the end 
of each sweep of beam 2. The internal 
Readout Mode Switch operates indepen- 
dently of the front-panel READOUT 
controls. 


Substantiated at the factory. 


POWER SOURCE 


Line Voltage Range (ac, rms) 
115 V Nominal 


90 to 132 V. 


Selected by rear-panel Line Selector 
switch. Does not normally require cus- 
tomer verification; substantiated at the 
factory. 


230 V Nominal 


180 to 264 V. 



PERFORMANCE CHECK PROCEDURE 



Introduction 

The following procedure checks the 7844/R7844 to meet 
the performance requirements given in Table 4-2. 



Index to Performance Check Procedure 



Page 

A. Z-AXIS AND CRT DISPLAY 

1. Check Graticule Illumination Operation 4-10 

2. Check Beam 2 Focus Range 4-10 

3. Check Beam 1 Focus Range 4-11 

4. Check Beam 1 Edge Focus 4-11 

5. Check Beam 2 Edge Focus 4-11 

6. Check Beam 1 Geometry 4-11 

7. Check Beam 2 Geometry 4-11 

8. Check External Beam 2 Z-Axis Operation .... 4-12 

9. Check External Beam 1 Z-Axis Operation .... 4-12 



Page 

B. CALIBRATOR AND OUTPUT SIGNALS 



1. Check CALIBRATOR Output Voltage 4-13 

2. Check CALIBRATOR 1 kHz Repetition Rate . . 4-13 

3. Check CALIBRATOR Risetime, Falltime, and 

Duty Cycle 4-13 

4. Check A and B SAWTOOTH Output Signals. . 4-14 

5. Check A GATE MAIN/DLY’D Output Signals . . 4-14 

6. Check B GATE MAIN/DLY’D Output Signals. . 4-14 



C. TRIGGER SELECTION 



1. Check Trigger Selection Operation 4-15 

2. Check DC Centering 4-15 

3. Check Trigger Gain 4-16 

4. Check Trigger Response 4-16 

5. Check Triggering Bandwidth 4-17 




Performance Check — 7844/R7844 Service 



Page 

D. HORIZONTAL SYSTEM (For instruments 7844 
SN B1 10000-above; R7844 SN BlOOOOO-above) 

1 . Check Beam 1 Horizontal Amplifier Gain 4-18 

2. Check Beam 1 High-Frequency Timing 4-18 

3. Check Beam 2 Horizontal Amplifier Gain 4-1 9 

4. Check Beam 1 and Beam 2 Horizontal Amplifier 

Low-Frequency Linearity 4-19 

5. Check Beam 2 High-Frequency Timing 4-19 

E. HORIZONTAL SYSTEM (for instruments 7844 



SN B109999-below; R7844 SN B099999-below) 

1 . Check Beam 1 and Beam 2 Horizontal Amplifier 

Gain 4-21 

2. Check Beam 1 and Beam 2 Horizontal Amplifier 

Low-Frequency Linearity 4-21 

3. Check Beam 1 High-Frequency Timing 4-22 

4. Check Beam 2 High-Frequency Timing 4-22 



F. VERTICAL SYSTEM 



1 . Check Beam 1 and Beam 2 Vertical Amplifier 

Gain 4-23 

2. Check Beam 1 and Beam 2 Vertical Crossover 

Gain 4-23 

3. Check Low-Frequency Linearity 4-24 

4. Check Beam 1 and Beam 2 Vertical Crossover 

Aberrations 4-24 

5. Check Beam 1 and Beam 2 Vertical Amplifier 

400 MHz Gain 4-25 



Page 



6. Check Vertical Channel Isolation 4-25 

7. Check Vertical Trace Separation Operation . . . 4-26 

G. READOUT SYSTEM 

Check Readout Modes 4-27 



Setup Procedure 

1 . Connect the instrument to a power source tha meets 
the voltage and frequency requirements marked on the in- 
strument rear panel. Refer to the Operating Information sec- 
tion in this manual for operating voltage information. 



NOTE 

If the correct line voltage is not available, use a vari- 
able autotransformer to provide the correct input 
voltage. 

2. Allow at least 20 minutes warmup before proceeding. 



NOTE 

Titles for external controls of the 7844/R7844 are cap- 
italized in this procedure (e.g., B TRIG SOURCE). 



4-9 




Performance Check — 7844/R7844 Service 



A. Z-AXIS AND CRT DISPLAY 

Equipment Required 

Time-base unit 18-inch, 50 ft cable with bnc connectors 

Amplifier unit 42-inch, 50 ft cable with bnc connectors 

Dc voltmeter Bnc T connector 

Test oscilloscope system with 1 0X probe 

Time-mark generator 

Medium-frequency signal generator 

Mainframe standardizer calibration fixture 



Control Settings 

Set the 7844/R7844 front-panel controls as follows: 

POWER switch ON 

CALIBRATOR 4 V 

READOUT INTENSITY Off (fully counterclockwise) 
A TRIG SOURCE LEFT 

B TRIG SOURCE RIGHT 

BEAM 1 

INTENSITY Off (fully counterclockwise 

VERT SEP (1) Midrange 

HORIZSEP(I) Midrange 

FOCUS Midrange 

VERTICAL MODE LEFT 

BEAMFINDER Push button out 

HORIZONTAL MODE A 

BEAM 2 

INTENSITY Off (fully counterclockwise) 

FOCUS Midrange 

VERTICAL MODE RIGHT 

BEAMFINDER Push button out 

HORIZONTAL MODE B 



1 . Check Graticule Illumination Operation 

a. CHECK- — Rotate the GRAT ILLUM control through- 
out its range and notice that the illumination of the graticule 
varies. 



b. Set the GRAT ILLUM control fully clockwise to the 
PULSED detent position. 



c. Install a time-base unit in the B HORIZ compartment. 



d. Set the time-base unit sweep rate for 0.2 s/div and 
triggering for a free-running sweep. Adjust the BEAM 2 IN- 
TENSITY control for a visible display. 



e. CHECK — Graticule illumination occurs only after the 
beam 2 horizontal system has completed a sweep (adjust 
GRAT ILLUM PRESET, if necessary). 



f. CHECK— Press the GRAT ILLUM MANUAL push but- 
ton and check for one momentary illumination of the 
graticule. 



g. Set the GRAT ILLUM control to midrange (out of the 
PULSED detent position). 



h. Install an amplifier unit in the LEFT VERT 
compartment. 



2. Check BEAM 2 Focus Range 

a. Set the time-base unit sweep rate for 1 ms/div. 



b. Connect the CALIBRATOR output to the amplifier 
unit. 



c. Set the amplifier unit deflection factor for a 1 div cen- 
tered display. Set the time-base unit triggering for a stable 
display and position as necessary. 



d. Set front-panel BEAM 2 FOCUS control to midrange. 



e. CHECK — Square wave should be well defined with 
sharp edges at medium intensity. 



4-10 



REV JUN 1981 




Performance Check — 7844/R7844 Service 



3. Check BEAM 1 Focus Range 

a. Move the time-base unit to the A HORIZ 
compartment. 



b. Set the amplifier unit deflection factor for a 1 div cen- 
tered display. 



c. Set the front-panel BEAM 1 FOCUS control to 
midrange. 



d. CHECK — Square wave should be well defined with 
sharp edges at medium intensity. 



e. Disconnect the CALIBRATOR signal. 



4. Check BEAM 1 Edge Focus 

a. Replace the amplifier unit installed in the LEFT VERT 
compartment with the Calibration Fixture signal 
standardizer. 



b. Set the signal standardizer Test switch to Vert or 
Horiz + Step Resp and the Rep Rate switch to 1 MHz. 
Adjust the time-base unit for 2 M s/div in the time-base mode 
and set the triggering for a stable display from the internal 
source. Set the signal standardizer Amplitude control for a 
0.5 div display. Position the display to graticule center. 



c. Set the BEAM 1 FOCUS control for a well-defined 
display. 



d. CHECK — Position the 0.5 div display to the top and 
then to the bottom graticule divisions and check for a well- 
defined display. 



5. Check BEAM 2 Edge Focus 

a. Move the Calibration Fixture signal standardizer to 
the RIGHT VERT compartment and the time-base unit to 
the B HORIZ compartment. 



b. Set the signal standardizer Test switch to Vert or 
Horiz + Step Resp and the Rep Rate switch to 1 MHz. 
Adjust the time-base unit for 2 /us/div in the time-base mode 
and set the triggering for a stable display from the internal 
source. Set the signal standardizer Amplitude control for a 
0.5 div display to graticule center. 



c. Set the BEAM 2 FOCUS control for a well-defined 
display. 



d. CHECK — Position the 0.5 div display to the top and 
then to the bottom graticule divisions and check for a well- 
defined display. 



e. Replace the Calibration Fixture Signal Standardizer, 
installed in the LEFT VERT compartment with the amplifier 
unit. 



6. Check BEAM 1 Geometry 

a. Move the time-base unit to the A HORIZ 
compartment. 



b. Apply 1 ms time markers to the amplifier unit. 



c. Apply 1 ms time marker triggers to the time-base ex- 
ternal trigger input. 



d. Set the time-base triggering for auto mode, with ac 
coupling from the external source at a sweep rate of 
0.5 ms/div. 



e. Set the amplifier unit deflection factor and position 
controls so that the time marks extend above and below the 
top and bottom of the graticule. 



f. Set the time-base unit variable time/division control to 
obtain 1 marker for each major graticule division. 



g. Set the time-mark generator for 0.1 ms markers. 



h. CHECK — That the vertical bowing and tilt of the 
marker display is less than 0.1 div (each 0.1 ms marker re- 
presents 0.1 div). 



7. Check BEAM 2 Geometry 

a. Move the amplifier unit to the RIGHT VERT compart- 
ment and the time-base unit to the B HORIZ compartment. 



b. Set the time-mark generator for 1 ms markers. 



c. Set the amplifier unit deflection factor and position 
control so that the time-markers extend above and below 
the top and bottom of the graticule. 



REV JUN 1981 



4-11 




Performance Check — 7844/R7844 Service 



d. Set the time-base unit variable time/division control to 
obtain 1 marker for each major graticule division. 



e. Set the time-mark generator for 0.1 ms. 



f. CHECK — That the vertical bowing and tilt of the mark- 
er displays is less than 0.1 div (each 0.1 ms marker repre- 
sents 0.1 div). 



8. Check EXTERNAL BEAM 2 Z-AXIS Operation 

a. To establish a ground reference, set the amplifier unit 
coupling switch to ground and position the trace to the cen- 
ter horizontal graticule line. 



b. Set the amplifier unit coupling to dc. 



c. Apply a 50 kHz signal from the medium-frequency 
generator to the amplifier unit. 



d. Set the amplifier unit deflection factor for 1 V/div. 



e. Set the medium-frequency generator for 2 div of sig- 
nal above the ground reference established in part a. 



f. Set the time-base unit sweep rate for 20 ^s/div. 



g. Set the BEAM 2 INTENSITY control for the brightest 
trace without defocusing. 



h. Connect the 50 kHz signal from the amplifier unit (with 
a bnc T connector), to the rear-panel BEAM 2 Z-AXIS IN- 
PUT connector. 



i. CHECK — Top portion of the displayed waveform is 
blanked out. 



9. Check EXTERNAL BEAM 1 Z-AXIS Operation 

a. Move the amplifier unit to the LEFT VERT compart- 
ment and the time-base unit to the A HORIZ compartment. 
Remove the 50 kHz signal from the BEAM 2 Z-AXIS INPUT 
connector. 



b. Set the BEAM 1 INTENSITY control for the brightest 
trace without defocusing. 



c. Connect the 50 kHz signal from the amplifier unit (with 
a bnc T connector) to the rear-panel BEAM 1 Z-AXIS INPUT 
connector. 



d. CHECK — Top portion of displayed waveform is 
blanked out. 



e. Remove all test equipment. 



4-12 



REV JUN 1981 




Performance Check — 7844/R7844 Service 



B. CALIBRATOR AND OUTPUT SIGNALS 



Equipment Required 




Precision dc voltmeter 
Amplifier plug-in unit 
Time-mark generator 

Time-base plug-in unit with delaying mode 
Dual-trace test oscilloscope 


18-inch, 50 fi cable with bnc connectors 
42-inch, 50 ft bnc cable (two) with bnc connectors 
Bnc T connector 



1 . Check Calibrator Output Voltage 

a. Set both the 4 V and 0.4 V CALIBRATOR push but- 
tons to the depressed position. 



b. Connect the precision dc voltmeter to the CALIBRA- 
TOR output connector. 



c. CHECK — Meter reading for 0.4008 V within 0.0004 V. 



d. Disconnect the precision dc voltmeter. 



2. Check Calibrator 1 kHz Repetition Rate 

NOTE 

A frequency counter with an accuracy of at least 0. 1 % 
may be used to adjust the calibrator repetition rate. 



a. Connect 1 ms time markers to the test oscilloscope 
external trigger input and to the non-inverting vertical chan- 
nel of the test oscilloscope (use a bnc T connector). Connect 
the 7844/R7844 4 V CALIBRATOR signal to the other verti- 
cal channel. 



b. Set the test oscilloscope triggering to auto mode with 
ac coupling from the external source and adjust the trigger- 
ing level for a stable display. Set the sweep rate for 1 ms/div 
in the alternate vertical mode. 



c. Set the test oscilloscope deflection factors to display 
2 div of CALIBRATOR signal and I div of time-marker 
signal. 



d. Set the test oscilloscope vertical mode to add and the 
sweep rate for 0.2 s/div. 



e. CHECK — Time required for the 1 ms time marks to 
drift from the positive level of the CALIBRATOR signal to 
the negative level and back to the positive level must be at 
least 0.4 s (2 div). This time can be measured directly from 
the display by observing the number of divisions that the 
markers move across the display area before it returns to 
the positive level. 



f. Disconnect all test equipment. 



3. Check Calibrator Risetime, Falltime, and Duty 
Cycle 

a. Set the CALIBRATOR to the 4 V position. 



b. Connect the CALIBRATOR output to the inverting 
vertical input of the test oscilloscope and set the vertical 
mode to display the inverting channel. 



c. Set the test oscilloscope vertical deflection factor to 
display 4 div of CALIBRATOR signal. 



d. Set the test oscilloscope for a stable display, internal- 
ly triggered on the rising portion of the calibrator signal at a 
sweep rate of 0.1 ^s/div. 



e. CHECK — Displayed waveform for not more than 
2.5 div between the 10% and 90% points (risetime, 0.25 ns 
or less). 



f. Set the test oscilloscope for a stable display triggered 
on the falling portion of the waveform. 



g. CHECK— Displayed waveform for not more than 
2.5 div between the 90% and 10% points (falltime, 0.25 
or less). 



REV JUN 1981 



4-13 




Performance Check— 7844/R7844 Service 



h. Set the test oscilloscope triggering for auto mode with 
ac coupling from the internal source at a sweep rate of 
0.1 ms/div. Set the triggering control so that the display 
starts at the 50% point on the rising edge of the waveform. 



i. Set the test oscilloscope sweep magnifier to XI 0. 
Then, position the display horizontally so the falling edge of 
the waveform aligns with the center vertical graticule line. 



j. Set the test oscilloscope vertical to invert the display. 
(NOTE: The display is triggered on the opposite slope, even 
though the display appears the same.) 



k. CHECK — 50% point on the falling edge of the 
waveform now displayed is within 0.4 div horizontally of the 
center line (indicates duty cycle of 50% within 0.1%). 



I. Disconnect all cables. 



4. Check A and B SAWTOOTH Output Signals 

a. Install a time-base unit in the A HORIZ compartment 
and set the sweep rate for 1 ms/div. 



b. Set the test oscilloscope sweep rate for 2 ms/div and 
the vertical deflection factor for 2 V/div. 



c. Connect the A SAWTOOTH output connector to the 
test oscilloscope vertical input (1 Mft input). 



d. CHECK — Test oscilloscope display for 1 V/div of 
sweep within 10% (10 V sawtooth display for 10 div sweep). 



e. Move time-base unit into the B HORIZ compartment. 



f. Connect the B SAWTOOTH output connector to the 
test oscilloscope vertical input (1 input). 



g. CHECK — Test oscilloscope display for 1 V/div of 
sweep within 10% (10 V sawtooth display for 10 div sweep). 



h. Disconnect all test equipment. 



5. Check A GATE MAIN/DLY’D Output Signals 

a. Install a delaying time-base unit in the A HORIZ com- 
partment. Set the time-base unit for non-delayed operation 
at a sweep rate of 0.5 ms/div. Set triggering for auto mode. 



b. Set the rear-panel A GATE MAIN/DLY'D selector 
switch to MAIN. 



c. Connect the A GATE output connector to the test os- 
cilloscope vertical input. Set the vertical deflection factor for 
2 V/div and the sweep rate for 2 ms/div. 



d. CHECK — Test oscilloscope display for a gate 
waveform of at least 5 div in ampllitude with a duration of at 
least 2.5 div. 



e. Set the delaying time-base unit for delaying sweep 
operation. 



f. Set the rear-panel A GATE MAIN/DLY'D selector 
switch to DLY’D. 



g. CHECK — Test oscilloscope display for a gate 
waveform of at least 5 div in amplitude with a duration of at 
least 2.5 div. 



6. Check B GATE MAIN/DLY’D Output Signal 

a. Move the delaying time-base unit into the B HORIZ 
compartment. Set the time-base unit for non-delayed oper- 
ation at a sweep rate of 0.5 ms/div. Set triggering for auto 
mode. 



b. Set the rear-panel B GATE MAIN/DLY’D selector 
switch to MAIN. Connect the B GATE output connector to 
the test oscilloscope vertical input. Set the vertical deflec- 
tion factor for 2 V/div and sweep rate for 2 ms/div. 



c. CHECK — Test oscilloscope display for a gate 
waveform of at least 5 div in amplitude with a duration of at 
least 2.5 div. 



d. Set the time-base unit for delaying sweep operation. 



e. Set the B GATE MAIN/DLY'D selector switch to 
DLY’D. 



f. CHECK — Test oscilloscope display for a gate 
waveform of at least 5 div in amplitude with a duration of at 
least 2.5 div. 



g. Disconnect all cables. 



4-14 



REV JUN 1981 




Performance Check — 7844/R7844 Service 



C. TRIGGER SELECTION 



Equipment Required 




Amplifier plug-in unit 

Time-base plug-in unit 

Sampling sweep unit 

Calibration fixture signal standardizer 


Calibration fixture plug-in extender 

42-inch, 50 Q cable with bnc connectors (two required) 

18-inch, 50 fi cable with bnc connectors 



Control Settings 

Set the 7844/R7844 front-panel controls as follows: 



A TRIG SOURCE 


LEFT 


B TRIG SOURCE 


RIGHT 


BEAM 1 




INTENSITY 


As desired 


VERTICAL MODE 


LEFT 


BEAMFINDER 


Push button out 


HORIZONTAL MODE 


A 


BEAM 2 




INTENSITY 


As desired 


VERTICAL MODE 


RIGHT 


BEAMFINDER 


Push button out 


HORIZONTAL MODE 


A 


1. Check Trigger Selection Operation 


a. Install an amplifier unit in the LEFT VERT compart- 
ment and a time-base unit in the A HORIZ compartment. 



h. Move the time-base unit to the B HORIZ 
compartment. 



i. Set BEAM 1 and BEAM 2 HORIZONTAL MODE 
switches to B. 



j. CHECK — Square-wave display is stable when B TRIG 
SOURCE is set to RIGHT and not stable when set to LEFT. 
Adjust the triggering level control as necessary. 

for page 4-17 

k. Move the amplifier unit to the LEFT VERT 
compartment. 



I. CHECK — Square-wave display is stable when B TRIG 
SOURCE is set to LEFT and not stable when set to RIGHT. 
Adjust the triggering level control as necessary. 



m. Remove all test equipment. 



b. Set the time-base unit triggering to auto mode with ac 
coupling from the internal source and sweep rate for 0.5 ms. 



c. Connect the CALIBRATOR output to the amplifier 
unit input. 



2. Check DC Centering 

a. Install the dual-trace amplifier in the test oscilloscope 
and set the vertical sensitivity of both channels to 
50 mV/div. Set the DISPLAY MODE to ADD and the CH 2 
POLARITY to INVERT. 



d. Set the amplifier unit deflection factor and the CALI- 
BRATOR output for a 2 div display. 



e. CHEiCK — Square-wave display is stable when the A 
TRIG SOURCE is set to LEFT and not stable when set to 
RIGHT. Adjust the triggering level control as necessary. 



f. Move the amplifier unit to the RIGHT VERT 
compartment. 



g. CHECK — Square-wave display is stable when the A 
TRIG SOURCE is set to RIGHT and not stable when set to 
LEFT. Adjust the triggering level control as necessary. 



b. Install the time-base plug-in in the test oscilloscope 
and set it to 50 ^s/div. Set the TRIGGERING SOURCE to 
EXT. 



c. Disconnect the short cables in the plug-in extender 
that connect to the bnc connectors labeled A20 and B20. 



d. Connect CH 1 of the dual-trace amplifier to the bnc 
connector labeled A20 in the plug-in extender. Connect CH 
2 to the connector labeled B20. 



e. Set the ground reference at the center of the graticule 
on the test oscilloscope. 



REV JUN 1981 



4-15 





Performance Check — 7844/R7844 Service 



f. Install the plug-in extender in the A HORIZ compart- 
ment of the 7844/R7844 and set A TRIG SOURCE to LEFT. 



g. CHECK — Dc level remains within 50 mV of ground 
reference ( ± 1 div). 



h. Set A TRIG SOURCE to RIGHT. 



i. CHECK — Dc level remains within 50 mV of ground ref- 
erence (±1 div). 



j. Move the plug-in extender to the B HORIZ compart- 
ment and set B TRIG SOURCE to LEFT. 



k. CHECK — Dc level remains within 50 mV of ground 
reference ( ± 1 div). 



I. Set B TRIG SOURCE to RIGHT. 



m. CHECK — Dc level remains within 50 mV of ground 
reference | ± 1 div). 



h. CHECK — Six lines in 6 vertical divisions on the test 
oscilloscope; ±10% (0.6 div). 



4. Check Trigger Response 



NOTE 

The trigger step response aberrations adjustments af- 
fect the bandwidth of the trigger system. The adjust- 
ment parts of the procedure should be skipped if the 
aberrations are within the limits given. 



a. Disconnect the cables from the test oscilloscope am- 
plifier unit. 



b. Remove the amplifier and time-base units from the 
test oscilloscope and install the sampling unit. 



c. Connect the cable from A20 of the plug-in extender to 
the CH 1 input of the sampling unit. Connect the cable from 
B20 to the CH 2 input. 



3. Check Trigger Gain 

a. Install the signal standardizer in the RIGHT VERT 
compartment and set the TEST switch to TRIGGERING 
GAIN. Set the REP RATE to 1 MHz. 



b. CHECK — Six lines in 6 vertical divisions on the test 
oscilloscope; ±10% (0.6 div). 



c. Move the signal standardizer to the LEFT VERT com- 
partment and set B TRIG SOURCE to LEFT. 



d. CHECK — Six lines in 6 vertical divisions on the test 
oscilloscope; ±10% (0.6 div). 



e. Move the plug-in extender to the A HORIZ compart- 
ment and set A TRIG SOURCE to LEFT. 



d. Set the sampling unit as follows: 



CH 1 
CH 2 



MODE 

SEC/DIV 

SWP 

AUTO TRIG 
+ SLOPE 
REP 

I NT CH 1 
HF SYNC 



50 mV/div 

DC OFFSET to midrange 
50 mV/div 

DC OFFSET to midrange 
INVERT CH 2 (IN) 

ADD 

.2 ix s 

DELAYING (IN) 

OUT 

IN 

IN 

IN 

OUT 



e. Move the signal standardizer to the LEFT VERT com- 
partment and set the TEST switch to TRIGGERING + 
STEP RESP. Set the REP RATE to 1 MHz. 



f. Set the 7844/R7844 A TRIG SOURCE to LEFT. 

f. CHECK — Six lines in 6 vertical divisions on the test 
oscilloscope: ±10% (0.6 div). 

g. Using the POSITION and AMPLITUDE controls of the 
signal standardizer and the TRIGGERING LEVEL and 

g. Move the signal standardizer to the RIGHT VERT SCAN controls of the sampling unit, set up a stable, 6 div 

compartment and set A TRIG SOURCE to RIGHT. display on the test oscilloscope. 



4-16 



REV JUN 1981 




Performance Check — 7844/R7844 Service 



h. On the sampling unit, set the DELAYING Sweep to 
10 jus/div, the DELAYED Sweep to 1 ns, and the SWP con- 
trol to DELAYED (OUT). 



i. Adjust the DELAY ZERO (1st DOT) and the DELAY 
TIME MULT (2nd DOT) controls to display the leading edge 
of the waveform. 



j. CHECK — Aberrations of <15% (0.9 div). 



k. Move the signal standardizer to the RIGHT VERT 
compartment. 



I. Set A TRIG SOURCE to RIGHT. 



m. CHECK — Aberrations of <15% (0.9 div). 



n. Move the plug-in extender to the B HORIZ 
compartment. 



o. Set B TRIG SOURCE to RIGHT. 



p. CHECK — Aberrations of <15% (0.9 div). 



q. Move the signal standardizer to the LEFT VERT 
compartment. 



r. Set B TRIG SOURCE to LEFT. 



s. CHECK — Aberrations of <15% (0.9 div). 



5. Check Triggering Bandwidth 

a. Set the signal standardizer TEST to TRIGGERING 
FREQ RESP. 



b. Connect the high-frequency signal generator to the 
signal standardizer FREQ RESP input. 



c. Set the high-frequency signal generator to REF 
6 MHz. 

d. Set the sampling unit as follows: 

SEC/DIV Delaying Sweep 50 ns 

SWP Delaying (in) 



CH 1 INT IN 

+ SLOPE IN 

REP IN 

AUTO TRIG OUT 

HF SYNC OUT 



e. Adjust the AMPLITUDE control of the high-frequency 
signal generator so that the CW LEVELED light is lit. See 
that it remains lit throughout the remaining steps of the 
procedure. 



f. Using the POSITION and AMPLITUDE controls of the 
signal standardizer, establish a 6 div reference display on 
the test oscilloscope. 



g. Switch the high-frequency signal generator to the 
HIGH range and set it for 525 MHz. 



h. Set the sampling unit to HF SYNC (in) and SWP to 
Delayed (out). 



i. Using the SEC/DIV DELAYED and the TRIGGERING 
LEVEL controls, set the sampling unit so that several cycles 
of the waveform are displayed. 



j. CHECK — At least 4.2 div (-3 dB point) of amplitude. 



k. Move the signal standardizer to the LEFT VERT com- 
partment and set B TRIG SOURCE to LEFT. 



I. CHECK — At least 4 2 div of amplitude. 



m. Move the plug-in extender to the A HORIZ compart- 
ment and set A TRIG SOURCE to LEFT. 



n. CHECK — At least 4.2 div of amplitude. 



o. Move the signal standardizer to the RIGHT VERT 
compartment. 



p. Set A TRIG SOURCE to LEFT. 



q. CHECK — At leasts 4.2 div of amplitude. 



r. Remove all test equipment. 



REV JUN 1981 



4-17 




Performance Check — 7844/R7844 Service 



D. HORIZONTAL SYSTEM 

(For instruments 7844 SN B1 10000-above; R7844 SN BlOOOOO-above) 



Equipment Required 




Calibration fixture signal standardizer 


Dc voltmeter 


Amplifier plug-in 


42-inch, 50 Q cable with bnc connectors (two required) 


Time-base plug-in unit 




Time-mark generator 





front-panel controls as follows: 



Control Settings 

Set the 7844/R7844 

A TRIG SOURCE 
B TRIG SOURCE 
BEAM 1 
INTENSITY 
FOCUS 
BEAMFINDER 
HORIZONTAL MODE 
HORIZ SEP (1) 

BEAM 2 
INTENSITY 
FOCUS 

VERTICAL MODE 
BEAMFINDER 
HORIZONTAL MODE 



LEFT 

RIGHT 

Midrange 
As desired 
Push button out 
A 

Midrange 

Fully counterclockwise 

As desired 

RIGHT 

Push button out 
B 



2. Check BEAM 1 High-Frequency Timing 

a. Remove the calibration fixture from the A or B HORIZ 
compartment. 



b. Move the time-base unit to the B HORIZ compart- 
ment and set the BEAM 1 HORIZONTAL MODE switch to 
B. 



c. Install an amplifier unit in the LEFT VERT 
compartment. 



d. Set the time-base unit triggering for auto mode, ac 
coupled from the internal source at a sweep rate of 
1 ms/div. 



1. Check BEAM 1 Horizontal Amplifier Gain 

a. Install the calibration fixture in the B HORIZ compart- 
ment. Install a time-base unit in the LEFT VERT compart- 
ment and set it for a free running 1 ^s/div sweep. 



b. Set the calibration fixture Test switch to Vert or Horiz 
Gain and Rep Rate to 10 kHz. Align the trace with the cen- 
ter vertical graticule line with the calibration fixture Position 
control. 



c. CHECK — One trace per graticule division within 
0.05 div over the center 8 vertical graticule divisions. 



d. Move the calibration fixture to the A HORIZ compart- 
ment and set the BEAM 1 HORIZONTAL MODE switch to 
A. 



e. CHECK — One trace per graticule division within 
0.08 div over the center 8 vertical graticule divisions. 



e. Connect 1 ms markers from the time-mark generator 
to the amplifier input and adjust the amplifier unit deflection 
factor for a 3 div display. 



f. Set B TRIG SOURCE to LEFT and the time-base unit 
triggering controls for a stable display. 

g. Set the time-base unit sweep-calibration adjustment 
(front panel) for 1 marker at each major graticule division 
between the second and tenth graticule lines (center 8 div). 

h. Connect the trigger output of the time-mark generator 
to the time-base unit external trigger input with a bnc cable. 



i. Set the time-base unit triggering for auto mode ac 
coupled from the external source at a sweep rate of 
5 ns/div. Set the time-mark generator for 5 ns markers. 



j. Set the time-base triggering controls for a stable 
display. 



4-18 



REV JUN 1981 




Performance Check — 7844/R7844 Service 



k. CHECK — High-frequency timing over the center 8 div 
within 0.32 div (4%). 



I. Set the time-mark generator for 2 ns markers and the 
time-base unit for 1 ns/div sweep rate. 



m. Set the time-base triggering controls for a stable 
display. 



n. CHI-CK — High-frequency timing over the center 8 div 
(one cycle every two divisions) within 0.32 div (4%). 



o. Disconnect all cables. 



3. Check BEAM 2 Horizontal Amplifier Gain 

a. Install the calibration fixture in the B HORIZ compart- 
ment and set the BEAM 2 HORIZONTAL MODE switch to 
B. 



b. Set the calibration fixture Test switch to Vert or Horiz 
Gain and Rep Rate to 10 kHz. Align the trace with the cen- 
ter vertical graticule line with the calibration fixture Position 
control. 



c. CHECK — One trace per graticule division within 
0.05 div over the center 8 vertical graticule divisions. 



d. Move the calibration fixture to the A HORIZ compart- 
ment and set the BEAM 2 HORIZONTAL MODE switch to 
A. 



e. CHECK — One trace per graticule division within 
0.08 div over the center 8 vertical graticule divisions. 



4. Check BEAM 1 and BEAM 2 Horizontal Amplifier 
Low-Frequency Linearity 

a. Set the calibration fixture Test switch to Vert or Horiz 
+ Step Resp. 



b. Set the calibration fixture Amplitude control for a 2 div 
centered display. 



c. CHECK — Position the 2 div display to the left and to 
the right, check for 0.1 div or less compression or expansion 
of the display anywhere within the graticule area. 



d. Move the time-base unit to the RIGHT VERT 
compartment. 



e. Set BEAM 1 INTENSITY control fully counterclock- 
wise and BEAM 2 INTENSITY control for usable display. 



f. CHECK — Position the 2 div display to the left and to 
the right and check for 0.1 div or less compression or ex- 
pansion of the display anywhere within the graticule area. 



5. Check BEAM 2 High-Frequency Timing 

a. Remove the calibration fixture from the A or B 
compartment. 



b. Move the time-base unit to the B HORIZ compart- 
ment and set the BEAM 2 HORIZONTAL MODE switch to 
B. 



c. Install an amplifier unit in the RIGHT VERT 
compartment. 



d. Set the time-base unit triggering for auto mode, ac 
coupled from the internal source at a sweep rate of 
1 ms/div. 



e. Connect 1 ms markers from the time-mark generator 
to the amplifier input and adjust the amplifier unit deflection 
factor for a 3 div display. 



f. Set the B TRIG SOURCE to RIGHT and the time-base 
triggering controls for a stable display. 



g. Set the time-base unit sweep-calibration adjustment 
(front panel) for 1 marker at each major graticule division 
between the second and tenth graticule lines (center 8 div). 



h. Connect the trigger output of the time-mark generator 
to the time-base unit external trigger input with a bnc cable. 



i. Set the time-base unit triggering for auto mode, ac 
coupled from the external source at a sweep rate of 
5 ns/div. Set the time-mark generator for 5 ns markers. 



j. Set the time-base triggering controls for a stable 
display. 




Performance Check — 7844/R7844 Seivice 

k. CHECK — High-frequency timing over the center 8 div n. CHECK — High-frequency timing over the center 8 div 

within 0.32 div (4%). (one cycle every two divisions) within 0.32 div (4%). 



I. Set the time-mark generator for 2 ns markers and the o. Disconnect all cables, 

time-base unit for 1 ns/div sweep rate. 



m. Set the time-base triggering controls for a stable 
display. 



(fi D 



4-20 




Performance Check — 7844/R7844 Service 



E. HORIZONTAL SYSTEM 

(For instruments 7844 SN B109999-below; R7844 SN B099999-below) 



Equipment Required 

Calibration fixture signal standardizer 18-inch, 50 Q cable with bnc connectors 

Amplifier plug-in unit 1 8-inch cable with bsm female and bnc male connectors 

Time-base plug-in unit 

Time-mark generator 

42-inch, 50 Q cable with bnc connectors 



Control Settings 

Set the 7 844/ R 7 844 front-panel controls as follows: 



A TRIG SOURCE 


LEFT 


BTRIG SOURCE 


RIGHT 


BEAM 1 




INTENSITY 


Midrange 


FOCUS 


As desired 


VERTICAL MODE 


LEFT 


BEAMFINDER 


Push button out 


HORIZONTAL MODE 


A 


HORIZ SEP (1) 
BEAM 2 


Midrange 


INTENSITY 


Midrange 


FOCUS 


As desired 


VERTICAL MODE 


RIGHT 


BEAMFINDER 


Push button out 


HORIZONTAL MODE 


B 


1. Check BEAM 1 and BEAM 2 Horizontal 


Amplifier Gain 




a. Install a time-base unit in the RIGHT VERT compart- 
ment. Install the calibration fixture signal standardizer in the 


B HORIZ compartment. 




b. Set the calibration fixture Test switch to Vert or Horiz 
Com Mode and the time-base unit for a free-running sweep. 



c. CHECK — Vertical trace is within 0.5 div of the center 
verticcal graticule line. 



d. Set the calibration fixture Test switch to Vert or Horiz 
Gain and the Rep Rate to 1 MHz. Align the bright center 
trace with the center vertical graticule line with the calibra- 
tion fixture Position control. 



f. Set the BEAM 2 INTENSITY control fully 
counterclockwise. 



g. Move the time-base unit to the LEFT VERT 
compartment. 



h. Set the BEAM 1 HORIZONTAL MODE switch to B. 



i. Set the calibration fixture Test switch to Com Mode 
and the BEAM 1 INTENSITY control for a usable display. 



j. CHECK — Horizontal centering of the trace is within 
0.5 div of the center graticule line. 



k. Set the calibration fixture Test switch to Vert or Horiz 
Gain. 



I. CHECK — One trace per graticule division within 0.01 
div over the center 8 vertical graticule divisions. 



2. Check BEAM 1 and BEAM 2 Horizontal Amplifier 
Low-Frequency Linearity 

a. Set the calibration fixture Test switch to Vert or Horiz 
+ Step Resp. 



b. Set the calibration fixture Amplitude control for a 2 div 
centered display. 



c. CHECK — Position the 2 div display to the left and to 
the right; check for 0.1 div or less compression or expan- 
sion of the display anywhere within the graticule area. 



e. CHECK— One trace per graticule division within 0.01 d. Move the time-base unit to the RIGHT VERT 

div over the center 8 vertical graticule divisions. compartment. 



4-21 





Performance Check — 7844/R7844 Service 



e. Set the BEAM 1 INTENSITY control fully counter- 
clockwise and BEAM 2 INTENSITY control for a usable 
display. 



f. CHECK — Position the 2 div display to the left and to 
the right and check for 0.1 div or less compression or ex- 
pansion of the display anywhere within the graticule area. 



3. Check BEAM 1 High-Frequency Timing 

a. Remove the calibration fixture from the B HORIZ 
compartment. 



b. Move the time-base unit to the B HORIZ 
compartment. 



c. Install an amplifier unit in the LEFT VERT 
compartment. 



d. Set the time-base unit triggering for auto mode ac 
coupled from the internal source at a sweep rate of 
1 ms/div. 



e. Set the BEAM 2 INTENSITY control fully counter- 
clockwise and the BEAM 1 INTENSITY control for a usable 
display. 



f. Connect 1 ms markers from the time-mark generator 
to the amplifier unit input and adjust the amplifier unit deflec- 
tion factor for a 2 div display. 



g. Set the B TRIG SOURCE switch to LEFT and the 
time-base unit triggering controls for a stable display. 



h. Position the first marker to the extreme left line on the 
graticule. 



i. Set the time-base unit sweep-calibration adjustment 
for 1 marker at each major graticule division between the 
second and tenth graticule lines (center 8 div). 



j. CHECK — Refer to the time-base unit instruction man- 
ual for performance check or calibration procedures for 
checking high-frequency timing and linearity. Use the proce- 
dures and limits given for the three fastest sweep rates that 
do not exceed 1 ns/div. 



4. Check BEAM 2 High-Frequency Timing 

a. Install an amplifier unit in the RIGHT VERT 
compartment. 



b. Install the time-base unit in the B HORIZ 
compartment. 



c. Set the time-base unit sweep rate for 1 ms/div and 
triggering for auto mode ac coupled from the internal 
source. 



d. Set the BEAM 1 INTENSITY control fully counter- 
clockwise and the BEAM 2 INTENSITY control for a usable 
display. 



e. Connect 1 ms markers from the time-mark generator 
to the amplifier unit. 



f. Set the B TRIG SOURCE switch to RIGHT and the 
time-base unit triggering controls for a stable display. 



g. Position the first marker to the extreme left line on the 
graticule. 



h. Set the time-base unit sweep-calibration adjustment 
for 1 marker at each major graticule division, between the 
second and tenth graticule lines (center 8 div). 



i. CHECK — Refer to the time-base unit instruction man- 
ual for performance check or calibration procedures for 
checking high-frequency timing and linearity. Use the proce- 
dures and limits given for the three fastest sweep rates that 
do not exceed 1 ns/div. 




Performance Check — 7844/R7844 Service 



F. VERTICAL SYSTEM 

Equipment Required 

Time-base plug-in unit High-frequency signal generator 

Amplifier plug-in unit 

Calibration fixture signal standardizer 



Control Settings 

Set the 7844/R7844 front-panel controls as follows: 

CALIBRATOR (1 kHz) 4 V (push button in) 

A TRIG SOURCE LEFT 

B TRIG SOURCE RIGHT 

BEAM 1 

INTENSITY Midrange 

VERTICAL MODE LEFT 

BEAMFINDER Push button out 

HORIZONTAL MODE A 

VEFlT SEP (1) Midrange 

Beam 2 

INTENSITY Fully counterclockwise 

VERTICAL MODE RIGHT 

BEAMFINDER 

(LOCKS IN) Push button out 

HORIZONTAL MODE A 



NOTE 

Step 1 applies only to Option 21. 



1 . Check BEAM 1 and BEAM 2 Vertical Amplifier 
Gain 

a. Install the calibration fixture in the LEFT VERT 
compartment. 



b. Install the time-base unit in the A HORIZ 
compartment. 



c. Set the calibration fixture Test switch to Vert or Horiz 
Gain with the Rep Rate switch set to 1 MHz. 



d. Position the display with the calibration fixture Posi- 
tion control to align the bright center trace with the center 
horizontal graticule line. 



e. CHECK — One trace per graticule division within 0.01 
div over the center 6 horizontal graticule divisions. 



f. Move the calibration fixture to the RIGHT VERT 
compartment. 



g. Move the time-base unit to the B HORIZ 
compartment. 



h. Position the display with the calibration fixture Posi- 
tion control to align the bright center trace with the center 
horizontal graticule line. 



i. CHECK — One trace per graticule division within 0.01 
div over the center 6 horizontal graticule divisions. 



NOTE 

Omit step 2 for Option 21. 



2. Check BEAM 1 and BEAM 2 Vertical Crossover 
Gain 

a. Set the calibration fixture Test switch to Vert or Horiz 
Gain with the Rep Rate switch set to 1 MHz. 



b. Set the BEAM 2 VERTICAL MODE switch to RIGHT. 



c. Position the display with the calibration fixture Posi- 
tion control to align the bright center trace with the center 
horizontal graticule line. 



d. CHECK — One trace per graticule division within 0.01 
div over the center 6 horizontal graticule divisions. 



e. Move the time-base unit to the A HORIZ 
compartment. 



f. Set the BEAM 1 VERTICAL MODE switch to RIGHT. 



4-23 





Performance Check— 7844/R7844 Service 



g. Position the display with the VERT SEP (1) control to 
align the bright center trace with the center horizontal 
graticule line. 



h. CHECK— One trace per graticule division within 0.01 
div over the center 6 horizontal graticule divisions. 



i. Move the time-base unit to the B HORIZ 
compartment. 



j. Move the calibration fixture to the LEFT VERT 
compartment. 



k. Set the BEAM 1 and BEAM 2 VERTICAL MODE 
switches to LEFT. 



I. Position the display with the calibration fixture Position 
control to align the bright center trace with the center hori- 
zontal graticule line. 



m. CHECK— One trace per graticule division with 0.01 
div over the center 6 horizontal graticule divisions. 



n. Move the time-base unit to the A HORIZ 
compartment. 



o. Position the display with the VERT SEP (1) control to 
align the bright center trace with the center horizontal 
graticule line. 



p. CHECK — One trace per graticule division within 0.01 
div over the center 6 horizontal graticule divisions (position 
as necessary). 



3. Check Low-Frequency Linearity 

a. Install the signal standardizer calibration fixture in the 
LEFT VERT compartment. 



b. Set the calibration fixture Test switch to Vert or Horiz 
+ Step RESP with the REP RATE switch set to 1 kHz. 



c. Set the calibration fixture Amplitude control for a 2 div 
display near the graticule center. Set the time-base trigger- 
ing for a free-running display. 



d. CHECK — Vertically position the display and check for 
less than 0.1 div of compression or expansion within the 
graticule area. 



e. Move the calibration fixture to the RIGHT VERT com- 
partment and the time-base unit to the B HORIZ 
compartment. 



f. CHECK — Vertically position the display and check for 
less than 0.1 div of compression or expansion within the 
graticule area. 



NOTE 

Omit step 4 for Option 21. 



4. Check BEAM 1 and BEAM 2 Vertical Crossover 
Aberrations 

a. Set the signal standardizer Test switch to Vert or 
Horiz + Step Resp, Rep Rate to 1 MHz, and adjust the 
amplitude control for a 6 div display. 



b. Set the VERTICAL MODE switch to BEAM 1 RIGHT 
and BEAM 2 LEFT. 



c. Move the time-base unit to the A HORIZ compart- 
ment and set the A TRIG SOURCE switch to RIGHT. 



d. Set the time-base unit triggering for auto mode, ac 
coupled from the internal source and sweep rate for 
10 ns/div. Adjust the trigger level and position the controls 
for a stable centered display. 



e. CHECK — Displayed pulse aberrations are within 0.36 
div (checks beam 1 crossover aberrations). 



f. Move the time-base unit to the B HORIZ compartment 
and the calibration fixture to the LEFT VERT compartment. 
Set the B TRIG SOURCE to LEFT. 



g. CHECK — Displayed pulse aberrations are within 0.36 
div (checks beam 2 crossover aberrations). 



h. Remove the calibration fixture. 




Performance Check — 7844/R7844 Service 



5. Check BEAM 1 and BEAM 2 Vertical Amplifier 
400 MHz Gain 

a. Insert the calibration fixture in the RIGHT VERT com- 
partment and set the Test switch to Vert or Horiz Freq 
Resp. 



b. Connect the high-frequency signal generator to the 
calibration fixture (Freq Resp) input. 



c. Set the time-base unit sweep rate for 0.1 ^s/div and 
set the triggering for a free-running sweep. 



d. Set the VERTICAL MODE switches to BEAM 1 LEFT 
and BEAM 2 RIGHT (delete with Option 21). Set the A TRIG 
SOURCE to LEFT and the B TRIG SOURCE to RIGHT. 



e. Set the high-frequency generator for 6 div of 20 MHz 
signal (or slower) centered on the graticule. 



f. Without changing the output amplitude, increase the 
generator frequency until the displayed amplitude is reduced 
to 4.2 div. 



NOTE 

The calibration fixture CW Leveled light must be on 
and the signal generator must be properly connected 
for a valid check. Refer to the calibration fixture and 
signal generator manuals. 



g. CHECK — Generator frequency is 400 MHz or higher 
(verifies 400 MHz Gain). 



h. Move the calibration fixture to the LEFT VERT com- 
partment (leave signal connected) and move the time-base 
unit to the A HORIZ compartment. 



i. CHECK — Repeat parts e through g for the Beam 1 
Vertical Amplifier. 



j. Set the BEAM 2 VERTICAL MODE switch to LEFT 
(delete parts j through q with Option 21). 



k. Move the time-base unit to the B HORIZ 
compartment. 



I. CHECK — Repeat parts e through g (verifies beam 2 
crossover 400 MHz Gain). 



m. Move the calibration fixture to the RIGHT VERT com- 
partment and the time-base unit to A HORIZ compartment. 



n. Set the BEAM 1 VERTICAL MODE switch to RIGHT. 



o. CHECK — Repeat parts e through g (verifies beam 1 
crossover 400 MHz Gain). 



p. Set the VERTICAL MODE switches to BEAM 1 LEFT 
and BEAM 2 RIGHT. 



q. Set the HORIZONTAL MODE switches to BEAM 1 A 
and BEAM 2 B. 



r. Remove signal connections and the calibration fixture 
plug-in unit. 



6. Check Vertical Channel Isolation 

a. Install the amplifier unit in the LEFT VERT compart- 
ment and the time-base unit in the A HORIZ compartment. 



b. Connect the high-frequency signal generator to the 
amplifier unit input. 



c. Set the high-frequency generator and the amplifier 
unit for 8 div of deflection at 400 MHz. 



d. Move the time-base unit to the B HORIZ 
compartment. 



e. CHECK — Crt display for 0.26 div or less of the 
400 MHz signal (verifies beam 2 channel isolation at least 
30:1 at 400 MHz). 



f. Move the amplifier unit to the RIGHT VERT compart- 
ment without disturbing set-up. 



g. Move the time-base unit to the A HORIZ 
compartment. 



h. CHECK — Crt display for 0.26 div or less of the 
400 MHz signal (verifies beam 1 channel isolation at least 
30:1 at 400 MHz). 



4-25 




Performance Check — 7844/R7844 Service 



i. Move the amplifier unit to the LEFT VERT 
compartment. 



j. Set the high-frequency generator for 8 div of deflection 
at 150 MHz. 



k. Move the time-base unit to the B HORIZ 
compartment. 



I. CHECK — Crt display for 0.08 div or less of 150 MHz 
signal (verifies beam 2 channel isolation at least 100:1 from 
dc to 150 MHz). 



m. Move the amplifier unit to the RIGHT VERT compart- 
ment without disturbing set-up. 



n. Move the time-base unit to the A HORIZ 
compartment. 



o. CHECK — Crt display for 0.08 div or less of 150 MHz 
signal (verifies beam 1 channel isolation at least 100:1 from 
dc to 150 MHz). 



p. Remove signal connection. 



7. Check Vertical Trace Separation Operation 
(delete with Option 21) 

a. Set the BEAM 1 and BEAM 2 VERTICAL MODE 
switches to RIGHT. 

b. Set BEAM 2 HORIZONTAL MODE switch to A. 



c. CHECK — Rotate the VERT SEP (1) control through- 
out its range and check that the trace can be positioned at 
least 4 div above and below the BEAM 2 trace. 

d. Remove all plug-in units. 



4-26 




Performance Check — 7844/R7844 Service 



G. READOUT SYSTEM 



Equipment Required 

Amplifier plug-in unit 
Time-base plug-in unit 



Control Settings 

Set the 7844/R7844 front-panel controls as follows: 


READOUT 

EXTERNAL-BEAM 2 
GATED 


BEAM 2 GATED 


BEAM 1 
INTENSITY 


(push button out) 
Midrange 


FOCUS 


Midrange 


VERTICAL MODE 


LEFT 


BEAMFINDER 
(LOCKS IN) 


Push button out 


HORIZONTAL MODE 


A 


BEAM 2 
INTENSITY 


Midrange 


VERTICAL MODE 


RIGHT 


BEAMFINDER 
(LOCKS IN) 


Push button out 


HORIZONTAL MODE 


B 



c. CHECK — Set the time-base unit for several sweep 
rates throughout its range. Check that the readout charac- 
ters are presented independent of the sweep. 



d. Set the READOUT INTENSITY control fully clockwise 
to the PULSED position. 



e. Set the READOUT Mode switch to OUT — BEAM 2 
GATED. 



f. Set the time-base unit for a free-running sweep at a 
sweep rate of 0.2 s/div. 



g. CHECK — Readout characters are blanked out while 
the sweep is running, and are displayed after the end of the 
sweep; each character encoded by the plug-in units is dis- 
played only once for each sweep. If necessary, adjust 
READOUT PRESET. 



Check Readout Modes 

a. Set the time-base unit for a free-running sweep. 



h. CHECK — Pressing the MANUAL push button triggers 
one complete frame of Readout characters. 



b. Set the READOUT INTENSITY control to free run 
(not PULSED). 



This completes the 7844/R7844 Performance Check 
Procedure. 





Section 5 — 7844/R7844 Service 



ADJUSTMENT 



PRELIMINARY INFORMATION 

Completion of each step in this procedure ensures that 
the 7844/R7844 is correctly adjusted and operating within 
all given tolerances. Refer to the following discussion for 
instructions on complete or partial adjustment. 



Adjustment Interval 

To maintain instrument accuracy, check the adjustment 
of the 7844/R7844 every 1000 hours of operation, or every 
six months if used infrequently. Before complete adjust- 
ment, thoroughly clean and inspect this instrument as out- 
lined in the Maintenance Section. 



Tektronix Field Service 

Tektronix, Inc. Field Service Centers and Factory Service 
Centers provide instrument repair and readjustment ser- 
vices. Contact your Tektronix field Office or representative 
for further information. 



Using Tlfiis Procedure 

Completion of this procedure will check the adjustment 
of the standard 7844/R7844 and instruments with options. 
When portions of this procedure do not apply to an instru- 
ment with an option, a note will appear at the beginning of 
the step (e.g. Omit with Option 21). The Set-Up Information 
will include control settings for the 7844/R7844 standard 
model and instruments with options. 



Index 

To aid in locating procedure steps, an index precedes the 
Adjustment Procedure. 



Adjustment Procedure 

Completion of each step in the Adjustment Procedure 
ensures that the instrument is correctly adjusted and per- 
forming within all given tolerances. Where possible, instru- 
ment performance is checked before an adjustment is 
made. For best overall performance when performing a 
complete adjustment, make each adjustment to the exact 
setting indicated. 



PROCEDURE 



Partial Procedures 

The following procedure is written to completely adjust 
the 7844/R7844 to the Performance Requirements listed in 
Table 5-2. If the applications for which you will use the 
7844/R7844 do not require the full available performance 
from the 7844/R7844 and plug-in combinations, the proce- 
dures and the required equipment list can be shortened ac- 
cordingly. For example, the basic low-frequency 
measurement capabilities of this instrument can be verified 
by just checking vertical deflection accuracy and basic hori- 
zontal timing with 7000-Series real-time plug-in units and 
the 7844/R7844 calibrator signal. 



A partial instrument adjustment may be desirable after 
replacing components, or to check the adjustment of a por- 
tion of the instrument between major recalibrations. To 
check or adjust only part of the instrument, refer to the 
Equipment Required list preceding the portion to be per- 
formed. To avoid unnecessary adjustments of other parts, 
readjust only if the tolerance given in each CHECK is not 
met. If readjustment is necessary, also check any portions 
listed in the INTERACTION part of the step. 



TEST EQUIPMENT REQUIRED 

The test equipment listed in Table 5-1 is required for a 
complete of this instrument. Specifications given in Table 5- 
1 for test equipment are the minimum required to meet 
those specifications (listed in the Specification section). De- 
tailed operating instructions for test equipment are omitted 
in this procedure. Refer to the test equipment instruction 
manual if more information is needed. 



Special Calibration Fixtures 

Special calibration fixtures are used only where they fa- 
cilitate the instrument adjustment. These fixtures are avail- 
able from Tektronix, Inc. Order by part number from 
Tektronix Field Offices or representatives. 



Adjustment Equipment Alternatives 

Test equipment listed in the Examples of Applicable Test 
Equipment column, Table 5-1, is required to adjust this in- 
strument. The Adjustment Procedure is based on the first 



REV JUN 1981 



5-1 




Adjustment Procedure — 7844/R7844 Service 



item of equipment given as an example. If other equipment 
is substituted, control settings or adjustment setups may 
need to be altered. If the exact item of equipment given as 
an example is not available, refer to the Minimum Specifica- 
tions column to determine if other equipment may be substi- 
tuted. Then check the Usage column. If you determine that 
your measurement requirements will not be affected, the 
item and corresponding step(s) can be deleted. 



Signal Connections 

Detailed signal-connection information is not provided 
except when critical for a particular test. Rear-panel output 
connections should be connected to other equipment with 
50 $2 bnc cables. When simultaneously connecting a signal 
to two inputs, use a bnc T connector. For test equipment 
signal-connection and termination information, refer to the 
test equipment instruction manuals. 



Table 5-1 

TEST EQUIPMENT 



Description 


Minimum Specifications 


Usage 


Examples of 
Applicable 
Test Equipment 


Precision dc voltmeter 


Range, -75 to +150 
volts; accuracy, within 
0.2%. 


Calibrator output accuracy 
check and adjustment. Power 
supply voltages, check and 
adjustment. Z-Axis and Dis- 
play check and adjustment. 


a. TEKTRONIX DM 501 A Digital 
Multimeter. 3 

b. Fluke Model 825A Differential 
DV Voltmeter. 


Time-mark generator 


Marker outputs, 2 ns to 
0.1 s; marker accuracy, 
within 0.1%; trigger out- 
put, 1 ms. 


Crt geometry check and ad- 
justment. Horizontal timing 
check and adjustment. Cali- 
brator frequency check and 
adjustment. 


TEKTRONIX TG 501 Time-Mark 
Generator. 3 


Medium-frequency signal 
generator 


Frequency range from 
2.5 MHz to 100 MHz with 
50 £2 output; output ampli- 
tude, 1 V p-p; accuracy, 
within 2%. 


Z-Axis input check. 


a. TEKTRONIX SG 503 Leveled 
Sine Wave Generator. 3 

b. General Radio 1215-C with 
1263-C Amplitude Regulating 
Power Supply. 


High-frequency signal 
generator 


Frequency, 220 MHz to 
500 MHz; reference fre- 
quency, 10 MHz or lower; 
output amplitude, variable 
from 0.5 to 4 V; amplitude 
accuracy, constant within 
1 % of reference as output 
frequency changes. 


Vertical bandwidth check. 
Vertical channel isolation 
check. 


a. TEKTRONIX SG 504 Leveled 
Sine Wave Generator. 


Amplifier unit 


TEKTRONIX 7A-Series 
(500 MHZ bandwidth re- 
quired for Vertical system 
400 MHz Gain check) plug- 
in unit. 


Used throughout procedure 
to provide vertical input to the 
instrument under adjustment. 


TEKTRONIX 7A1 9 Amplifier unit. 



5-2 



REV JUN 1981 




Adjustment Procedure — 7844/R7844 Service 



Table 5-1 (cont) 



Description 


Minimum Specifications 


Usage 


Examples of 
Applicable 
Test Equipment 


Amplifier unit (dual) 


Any 7A-Series; dual dis- 
play amplifier unit. 


Used to check position and 
operation of READOUT 
display. 


Any 7A-Series dual amplifier unit 
(may be shared with a 7000-Se- 
ries test oscilloscope). 


Time-base unit 


Tektronix 7B80 Series; de- 
laying unit needed for 
checking DLY'D gate out 
(7B85). 


Used throughout procedure 
to provide sweep (delaying 
time base). 


a. TEKTRONIX 7B85 Time 
Base. 








b. TEKTRONIX 7B80 Time 
Base. 


Sampling Unit 


Bandwidth, dc to 1 GHz; 
differential input. 


Used to check trigger aberra- 
tions and trigger bandwidth. 


a. TEKTRONIX 7S14 Dual- 
Trace Delayed Sweep Sampler. 








b. Sampling Head and Sampling 
Sweep. 


Plug-in Extender Calibra- 
tion Fixture 


Provides access to trigger 
signal from horizontal 
compartment jacks. 


Used to check/adjust trigger 
gain, aberrations, and 
bandwidth. 


TEKTRONIX Calibration Fixture 
067-0589-00. 


Mainframe standardizer 
calibration fixture 


Produces gain-check and 

pulse-response 

waveforms. 


Used throughout procedure 
to standardize instrument so 
plug-in units can be 
interchanged without com- 
plete readjustment. 


a. TEKTRONIX Calibration Fix- 
ture 067-0587-02. 








b. Calibrated 7000 Series plug- 
in units with suitable signal 
sources may be substituted if 
lower performance is acceptable. 


10x passive probe 


Compatible with test oscil- 
loscope to be used. 


Used to check power supply 
ripple, signals out, calibrator 
and Z-axis. 


TEKTRONIX P6053B or P6054A 
probe. 


Test oscilloscope 


Bandwidth, dc to 75 MHz; 
minimum deflection factor 
10 mV/div; accuracy, with- 
in 3%. Dual-channel with 
an inverting input and both 
added and alternate verti- 
cal modes. 


Used throughout procedure. 


a. TEKTRONIX 7603 Oscillo- 
scope System with 7A1 8 Amplifi- 
er, 7B53A Time Base, and 
P6053B Probe. 








b. TEKTRONIX 475 Oscillo- 
scope with P6053B Probe. 

c. Refer to the Tektronix Cata- 
log for compatible oscilloscope 
system. 


T connector 


bnc-to-bnc 


External Z-axis operation 
check. 


Tektronix Part No. 103-0030-00. 



REV JUN 1981 



5-3 




Adjustmen t Procedure — 7844/R7844 Service 



Table 5-1 (cont) 



Description 


Minimum Specifications 


Usage 


Examples of 
Applicable 
Test Equipment 


Termination 


Impedance, 50 0; accura- 
cy, within 2%; connectors, 
Bnc 


Output termination for signal 
generators, if amplifier is not 
50 £1 input impedance. 


Tektronix Part No. 011-0049-01. 


Cable (Two Required) 


Impedance, 50 0; type, 
RG-58/U; length, 18 and 
42 inches; connectors, 
Bnc 


Used throughout procedure 
for signal interconnections. 


Tektronix Part No. 012-0076-00 
(18 inches). Tektronix Part No. 
012-0057-01 (42 inches). 


Adapter 


Bnc female to EZ BALL 


Used to check and adjust Aux 
Y-Axis Vertical amplifier. 


Tektronix Part No. 013-0076-01. 


Screwdriver 


Three-inch shaft, 3/32-inch 
bit. 


Used throughout adjustment 
procedure to adjust variable 
resistors. 


Xcelite R-3323. 


Low-capacitance 

screwdriver 


1.5-inch shaft. 


Used throughout adjustment 
procedure to adjust variable 
capacitors. 


Tektronix Part No. 003-0000-00. 


Nylon tuning tool 


Fits 5/64-inch (ID) hex. 
cores. 


Vertical high-frequency 
compensation. 


Handle and insert, Tektronix 
Part No. 003-0307-00 and 003- 
0310-00. 



Requires Tm 500 Series Power Module. 



5-4 



REV JUN 1981 



Table 5-2 

ADJUSTMENT SUMMARY 



Adjustment Procedure — 7844/R7844 Service 







Adjustment Procedure 


Characteristic 


Performance Requirement 


Title 



VERTICAL 



Deflection Factor 


Compatible with all 7000-Series plug-in units. 


G3. Adjust Beam 1 and Beam 2 
Vertical Amplifier Gain. (Option 21 
only.) 


Accuracy 


1 % or less difference between vertical 
compartments. 


G4. Check Beam 1 and Beam 2 
Vertical Crossover Gain. 


System Elandwidth 


Varies with plug-in selected. See 7800-Se- 
ries Oscilloscope Systems Specification 


G6. Adjust Beam 1 Vertical High- 
Frequency Compensation. 

G7. Adjust Beam 2 Vertical High- 
Frequency Compensation. 


Vertical Centering 




G1 . Adjust Beam 1 Vertical 
Centering. 

G2. Adjust Beam 2 Vertical 
Centering. 


HORIZONTAL 



Deflection Factor 


Compatible with ail 7000-Series plug-in units 
1% or less difference between horizontal 
compartments 


E2. Adjust Beam 1 Horizontal Am- 
plifier Gain 

E5. Adjust Beam 2 Horizontal Am- 
plifier Gain 


Accuracy 


1 


FI . Adjust Beam 1 and Beam 2 
Horizontal Amplifier Gain 


Fastest Calibrated Sweep Rate 


1 ns/div. 


E3. Adjust Beam 1 High Frequency 
Timing 

E6. Adjust Beam 2 High Frequency 
Timing 

F2. Adjust Beam 1 High-Frequency 
Timing 

F3. Adjust Beam 2 High-Frequency 
Timing 


Horizontal Centering 




El . Adjust Beam 1 Horizontal 
Centering 

E4. Adjust Beam 2 Horizontal 
Centering 

FI . Adjust Beam 1 and BEAM 2 
Horizontal Amplifier Gain 



REV JUN 1981 



5-5 





Adjustment! Procedure — 7844/R7844 Service 



Table 5-2 (cont) 







Adjustment Procedure 


Characteristic 


Performance Requirement 


Title 



HORIZONTAL (cont) 



Horizontal Display Modes 


Plug-in compartment controlling horizontal 


Does not normally require customer 




deflection of electron beam. 




verification; substantiated at the 
factory. 




BEAM 1 


BEAM 2 






A 


A 






A 


B 






B 


A 






B 


B 




Phase Shift Between Vertical and Hori- 






Does not normally require customer 


zontal Deflection Systems 






verification; substantiated at the 
factory. 


Bandwidth (10 div reference) 








Horizontal Separation Control Range 









CALIBRATOR 



Output Voltage 

Into 100 kfi or greater 


4 mV, 40 mV, 0.4 mV, 4 V. 


Cl. Adjust CALIBRATOR Output 
Voltage. 


Into 50 il 


0.4 mV, 4 mV, 40 mV, 0.4 V. 


Substantiated at the factory. 


Output Curent 






7844 


40 mA 




R7844 


40 mA 




Repetition Rate 


1 kHz within 0.25%. 


C2. Adjust CALIBRATOR 1 kHz 






Repetition Rate. 



5-6 



REV JUN 1981 




Adjustment Procedure — 7844/R7844 Service 



ADJUSTMENT PROCEDURE 



Introduction 

The following procedure adjusts the 7844/R7844 to meet 
the performance requirements given in Table 5-2. 



Index to Adjustment Procedure 

Page 



A. POWER SUPPLY 

1. Adjust —50 V Power Supply 5-9 

2. Adjust Inverter Control 5-9 

3. Check Remaining Power-Supply Voltages . . 5-9 

B. Z-AXIS AND CRT DISPLAY 

1. Adjust Beam 1 Z-Axis 5-11 

2. Adjust Beam 1 Z-Axis Transient Response . 5-11 

3. Adjust Beam 1 Intensified Z-Axis 5-12 

4. Adjust Beam 2 Z-Axis 5-12 

5. Adjust Beam 2 Z-Axis Transient Response . 5-12 

6. Adjust Beam 1 and Beam 2 Symmetry .... 5-13 

7. Adjust Beam 2 Intensified Z-Axis 5-13 

8. Adjust Beam 2 Focus Range 5-14 

9. Adjust Beam 1 Focus Range 5-14 

10. Adjust Beam 1 Edge Focus 5-14 

1 1 . Adjust Beam 2 Edge Focus 5-15 

12. Adjust Beam 2 Auto-Focus Operation 5-15 

13. Adjust Beam 1 Auto-Focus Operation 5-16 

14. Adjust Trace Alignment 5-16 

15. Adjust Beam 1 Geometry (R2568, R1985, 

R1976 R2560) (R4985, R4976 For instruments 
7844 SN BllOOOO-above; R7844 SN B1 00000- 
above) 5-16 

16. Adjust Beam 2 Geometry (R2572, R2985, 
R2976 R2564) (R5976, R5985 For instruments 
7844 SN BllOOOO-above; R7844 SN B1 00000- 

above) 5-16 

17A. Adjust Beam 1 and Beam 2 CRT Centering 
(R4988, R5988) (For instruments 7844 SN 

BllOOOO-above; R7844 SN BlOOOOO-above). . . 5-17 

17B. Adjust Beam 1 and Beam 2 CRT Centering 
(R1988, R2988) (For instruments 7844 SN 

B109999-below; R7844 SN B099999-below). . . 5-17 

18. Adjust Y-Axis Alignment 5-18 

C. CALIBRATOR AND OUTPUT SIGNALS 

1. Adjust CALIBRATOR Output Voltage 5-19 

2. Adjust CALIBRATOR 1 kHz Repetition Rate 5-19 



Page 

E. HORIZONTAL SYSTEM (For instruments 7844 SN 
BllOOOO-above; R7844 SN BlOOOOO-above) 



1 . Adjust Beam 1 Horizontal Centering 5-22 

2. Adjust Beam 1 Horizontal Amplifier Gain .... 5-23 

3. Adjust Beam 1 High-Frequency Timing .... 5-23 

4. Adjust Beam 2 Horizontal Centering 5-24 

5. Adjust Beam 2 Horizontal Amplifier Gain . . . 5-24 

6. Adjust Beam 2 High-Frequency Timing .... 5-24 



F. HORIZONTAL SYSTEM (For instruments 7844 SN 
B109999-below; R7844 SN B099999-below) 

1 . Adjust Beam 1 and Beam 2 Horizontal 



Amplifier Gain 5-26 

2. Adjust Beam 1 High-Frequency Timing .... 5-27 

3. Adjust Beam 2 High-Frequency Timing .... 5-27 

G. VERTICAL SYSTEM 

1 . Adjust Beam 1 Vertical Centering 5-30 

2. Adjust Beam 2 Vertical Centering 5-30 

3. Adjust Beam 1 and Beam 2 Vertical Amplifier 

Gain 5-30 

4. Adjust Beam 1 and Beam 2 Vertical Crossover 

Gain 5-31 

5. Adjust Beam 1 and Beam 2 Aux Y Gain . . . 5-32 

6. Adjust Beam 1 Vertical High-Frequency 

Compensation 5-32 

7. Adjust Beam 2 Vertical High-Frequency 

Compensation 5-33 

H. READOUT SYSTEM 

1 . Adjust Vertical Separation 5-35 

2. Adjust Full Character Scan and Character 

Height 5-36 

3. Adjust Column Match and Row Match 5-36 



Setup Procedure 

1 . Remove the side and bottom covers from the 7844 or 
the top and bottom covers and the side panel from the 
R7844. Refer to the Maintenance section in this manual for 
panel removal information. 

2. Connect the instrument to a power source that meets 
the voltage and frequency requirements marked on the in- 
strument rear panel. Refer to the Operating Information sec- 
tion in this manual for operating voltage information. 

NOTE 

If the correct line voltage is not available, use a vari- 
able autotransformer to provide the correct input 
voltage. 



D. TRIGGER SELECTION 

Adjust Trigger Response 5-20 



REV JUN 1981 



5-7 




Adjustment Procedure — 7844/R7844 Service 



3. Allow at least 20 minutes warmup before proceeding. 



NOTE 

Titles for external controls of the 7844/R7844 are cap- 
italized in this procedure (e.g., B TRIG SOURCE). In- 
ternal adjustments are initial capitalized (e.g., Beam 2 
Horiz Gam). 



5-8 



REV JUN 1981 




Adjustment Procedure — 7844/R7844 Service 



A. POWER SUPPLY 



Equipment Required 

Precision dc voltmeter 
Three-inch screwdriver 



BEFORE YOU BEGIN, see adjustment locations i in the Diagrams section. 



Control Settings 

Set the 7 844/ R 7 844 controls as follows: 



POWER Switch 
CALIBRATOR (1 kHz) 
READOUT INTENSITY 
GRAT ILLUM 
BEAM 1 

BEAMFINDER 
BEAM 2 

BEAMFINDER 



Off 

4 V push button in 
OFF 

Counterclockwise 
Push button out 
Push button out 



1. ADJUST -50 VOLT POWER SUPPLY (R1513) 



WARNING 



Extreme caution must be used when operating the 
7 844/ P7 844 with the power unit removed due to the 
line voltage, high voltage, and high current potentials 
present. 



NOTE 

The Power Supply voltages can be checked without 
removing the Power Unit by using the 7000-Series rig- 
id extender 067-0589-00. 



b. Connect the line cord to the power source and set the 
POWER switch to ON. 



c. Connect the precision dc voltmeter between TP —50 
Volts Sense and TP Gnd Sense on the Regulator circuit 
board (see Fig. 9-27). 



d. Check — Meter reading for -50 volts within 0.2 volts. 



e. ADJUST— 50 Volts adjustment R1513 for a meter 
reading of -50 volts within 0.1 volts (see Fig. 9-27). 



f. INTERACTION — Any change in the setting of R1513 
may affect the operation of all circuits in the instrument. 



2. ADJUST INVERTER CONTROL (R1293) 

a. Connect the precision dc voltmeter between TP1625 
and chassis ground (see Fig. 9-28). 



b. Check — Meter reading for +50 volts within 5 volts. II 
meter reading is within the given tolerance, proceed to step 
A3. 



c. ADJUST — Inverter Control adjustment R1293 for a 
meter reading of +50 volts within 5 volts (see Fig. 9-28). 



a. Disconnect the line cord from the power source. Re- 
move all plug-in units from the plug-in compartments. Ex- 
pose the 7844 Power Supply adjustments and test points 
by removing the power unit from the rear of the 7844 
(interconnecting cables remain connected). See the Mainte- 
nance Section in this manual for power unit removal instruc- 
tions. The R7844 Power Supply test points and 
adjustments are accessible without removing the power 
unit. 



d. INTERACTION — Any change in the setting of R1293 
may affect the adjustment of the -50 volts supply (R1513). 



3. CHECK REMAINING POWER-SUPPLY 
VOLTAGES 

a. Check — Table 5-3 lists the low-voltage power sup- 
plies in this instrument. Check each supply with the preci- 
sion dc voltmeter for output voltage within the given 



REV JUts 1981 



5-9 




Adjustment: Procedure — 7844/R7844 Service 



tolerance. Connect meter common lead to TP Gnd Sens e. Install the power unit and connect the line cord, 

(see Fig. 9-27). 



b. INTERACTION — If the power supplies are not within 
the tolerances given in Table 5-3, repeat steps A1, Adjust 
— 50 Volt F'ower Supply and A2, Adjust Inverter Control. 

c. Disconnect the precision dc voltmeter. 



NOTE 

Regulation of the individual power supplies can be 
checked using the procedure given under 
Troubleshooting Techniques in Maintenance section. 



d. Disconnect the line cord from the power source. 



Table 5-3 

POWER SUPPLY TOLERANCE 



Power Supply 


Output Voltage 
Tolerance 


TP —50 Volt Sense 


±0.2 Volt 


TP - 1 5 Volt Sense 


±0.15 Volt 


TP +5 Volt Sense 


±0.10 Volt 


TP +15 Volt Sense 


±0.15 Volt 


TP +50 Volt Sense 


±0.50 Volt 


TP +130 Volt 


±5.2 Volt 


Control Ilium ( + 5 V Lights) 


+ 0.5 to -1.0 Volt 



5-10 



REV JUN 1981 




Adjustment Procedure — 7844/R7844 Service 



B. Z-AXIS AND CRT DISPLAY 



Equipment Required 




Time-base unit 


Mainframe standardizer calilbration fixture 


Amplifier unit 


18-inch, 50 0 cable with bnc connectors 


Delaying time-base unit 


42-inch, 50 ft cable with bnc connectors 


Dc voltmeter 


Bnc T connector 


Test oscilloscope system with 1 0X probe 


Three-inch screwdriver 


Time-mark generator 
Medium-frequency signal generator 


Low-capacitance screwdriver 



BEFORE YOU BEGIN, see ADJUSTMENT LOCATIONS 2 & 3 in the Diagrams section. 



Control Settings 

Set the /’844/R7844 front-panel controls as follows: 



POWER switch 


ON 


CALIBRATOR 


4 V 


READOUT INTENSITY 


Off (fully counter- 
clockwise) 


A TRIG SOURCE 


LEFT 


B TRIG SOURCE 


RIGHT 


BEAM 1 


INTENSITY 


Off (fully counter- 
clockwise) 


VERT SEP (1) 


Midrange 


HORIZ SEP (1) 


Midrange 


FOCUS 


Midrange 


VERTICAL MODE 


LEFT 


BEAMFINDER 


Push button out 


HORIZONTAL MODE 


A 


BEAM 2 


INTENSITY 


Off (fully counter- 
clockwise) 


FOCUS 


Midrange 


VERTICAL MODE 


RIGHT 


BEAMFINDER 


Push button out 


HORIZONTAL MODE 


B 



1. ADJUST BEAM 1 Z-AXIS (R1 180) 

a. Install an amplifier unit in the LEFT VERT compart- 
ment. Move the time-base unit to the A HORIZ 
compartment. 



b. Set the time-base unit sweep rate for 0.2 ms/div and 
triggering for a free-running sweep. 



c. Connect a 10X probe to the input of the test oscillo- 
scope and set the input coupling to ac. Check the probe 
compensation using the 7844 CALIBRATOR signal. 



d. Set the test oscilloscope vertical deflection factor for 
0.2 V/div (2 V/div at the probe tip), and sweep rate for a 
1 ms/div. 



e. Connect the probe tip to TP1186 and connect the 
probe ground to the chassis with a short grounding strap 
(see Fig. 9-29). 



f. Set BEAM 1 INTENSITY control for a 5 V pulse (2 1/2 
div) on the test oscilloscope. 



g. Set the time-base unit to the amplifier mode (an ampli- 
fier unit can be substituted for the time-base unit if the time- 
base unit does not have an amplifier mode). Set the BEAM 1 
BEAMFINDER switch to the LOCKS IN position. Using the 
amplifier and time base position controls, center the beam 
on the crt. Release the BEAM 1 BEAMFINDER switch. 



h. ADJUST — Beam 1 CRT Grid Bias adjustment R1180 
until the dot on the crt is just extinguished (see Fig. 9-29). 

2. ADJUST BEAM 1 Z-AXIS TRANSIENT 
RESPONSE (Cl 168, R1168, Cl 172) 

a. Set the time-base unit for a sweep rate of 0.02 /rs/div 
and display mode to time base. 



b. Set the amplifier unit position control fully clockwise. 



c. Set the test oscilloscope vertical deflection factor for 
1 V/div (10 V/div at the probe tip), and sweep rate for 
0.1 MS/div. Set the BEAM 1 INTENSITY control fully 

clockwise. 



d. Check — Total pulse signal amplitude (displayed on 
the test oscilloscope) must be at least 64 V. 



REV JUN 1981 



5-11 





Adjustment Procedure — 7844/R7844 Service 



e. Using the BEAM 1 INTENSITY control, reduce the 
pulse signal amplitude by approximately 25%. Move the 
probe tip to TP1 185 (see Fig. 9-29) and set the test oscillo- 
scope verlical deflection factor to display approximately 4 
div of pulse signal. Set triggering for a stable display. 



f. ADJUST — HF Comp #3 adjustment Cl 168 for flat 
top, HF Comp #2 adjustment R1168 and HF Comp #1 ad- 
justment Cl 172 (see Fig. 9-29) for a square corner on the 
displayed pulse (use low-capacitance screwdriver to adjust 
variable capacitors). 



3. ADJUST BEAM 1 INTENSIFIED Z-AXIS 

a. Move the time-base unit to the B HORIZ compart- 
ment and set the sweep rate to 1 ^s/div. 



b. Install the delaying time-base unit in the A HORIZ 
compartment and set the sweep rate to 10 /ns/div. 



c. Set Ihe 7844/R7844 HORIZONTAL MODE to: 

BEAM I A 

BEAM 2 B 



d. Connect the probe to TP1 186. 



e. Set the BEAM 1 INTENSITY control fully counter- 
clockwise and set a base line reference on the test 
oscilloscope. 



f. Set the BEAM 1 INTENSITY for a 20-volt pulse. 



g. Set Ihe delaying time-base unit to delayed mode. 



h. Check — A 6-volt pedestal atop the 20-volt pulse. 



NOTE 

A 6-volt pedestal at 20-volts generally provides the 
correct contrast throughout the range of the Z-Axis 
drive signal. The contrast may, however, be adjusted 
to suit the user’s particular needs without affecting 
the operation of the Z-Axis circuit. 



i. ADJUST — R335 on the LOGIC circuit board for a 6- 
volt pedestal atop the 20-volt pulse. 



j. Set the delaying time-base unit to non-delaying mode 
and remove. Move the time-base unit to the A HORIZ 
compartment. 



k. Disconnect all test equipment. 



4. ADJUST BEAM 2 Z-AXIS (R2080) 

a. Move the amplifier unit to the RIGHT VERT compart- 
ment. Move the time-base unit to the B HORIZ 
compartment. 



b. Set the time-base unit sweep rate for 0.2 ms/div and 
triggering for a free-running sweep. 



c. Set the test oscilloscope vertical deflection factor for 
0.2 V/div (2 V/ div at the probe tip) and sweep rate for 
1 ms/div. 



d. Connect the probe tip to TP2086 and the probe 
ground to the chassis with a short grounding strap (see Fig. 
9-30). For easy access to TP2086 and the Beam 2 Z-Axis 
adjustments, remove the power unit (on the R7844, Beam 2 
adjustments and test points are accessible by removing the 
bottom panel). See the Maintenance section for instructions 
on power unit removal. 



e. Set the BEAM 2 INTENSITY control for a 5 V pulse 
signal (2 1/2 div) on the test oscilloscope. 



f. Set the time-base unit to the amplifier mode. Set the 
BEAM 2 BEAMFINDER switch to the LOCKS IN position. 
Using the time-base and amplifier position controls, center 
the beam on the crt. Release the BEAM 2 BEAMFINDER 
switch. 



g. ADJUST— Beam 2 CRT Grid Bias adjustment R2080 
(see Fig. 9-30) so that the dot on the crt is just extinguished. 



5. ADJUST BEAM 2 Z-AXIS TRANSIENT 
RESPONSE (C2068, R2068, C2072) 

a. Set the time-base unit sweep rate for 0.02 /us/div and 
the display mode to time base. 



b. Set the amplifier unit position control fully clockwise. 



c. Set the test-oscilloscope vertical deflection factor for 
1 V/div (10 V/div at probe tip) and sweep rate for 0.1 ^s/div. 
Set the BEAM 2 INTENSITY control fully clockwise. 



5-12 



REV JUN 1981 




Adjustment Procedure — 7844/R7844 Service 



d. Check — Total pulse signal amplitude must be at least 
64 V. 



e. Using the BEAM 2 INTENSITY control, reduce the 
pulse signal amplitude by approximately 25%. Move the 
probe to TP2085 and set the test oscilloscope vertical de- 
flection factor to display approximately 4 div of pulse signal. 



f. ADJUST — HF Comp #3 adjustment C2068 for a flat 
top, HF Comp #2 adjustment R2068, and HF Comp #1 
adjustment C2072 (see Fig. 9-30) for a square corner on the 
displayed pulse (use low-capacitance screwdriver to adjust 
variable c apacitors). 



g. Disconnect all test equipment. 



NOTE 

Refer to Recalibration After Repair in the Maintenance 
section for a geometry preset procedure to facilitate 
recalibration after replacement or major repair of the 
CRT board, Beam 1 and Beam 2 Horizontal boards, 
or after replacement of the cathode-ray tube. 

6. ADJUST BEAM 1 AND BEAM 2 SYMMETRY 
(R1838 and R2838) (7844 SN B109999 & Below; 
R7844 SN B099999 & Below only) 

a. Set the time-base unit display mode to amplifier and 
the triggering source to external. 



b. Connect a dc voltmeter between the cases of Q2920 
and Q2890 (see Fig. 9-34). Using the time-base unit position 
control, set the dc voltmeter reading for 0 V. 



c. Connect the dc voltmeter between chassis ground 
and the case of Q2890. 



d. ADJUST — SYMM adjustment R2838 for a meter 
reading of 55 V, ±3 V (see Fig. 9-34). 



e. Move the time-base unit to the A HORIZ 
compartment. 



f. Connect a dc voltmeter between the cases of Q1890 
and Q1920 (see Fig. 9-33). Using the time-base unit position 
control, set the dc voltmeter reading for 0 V. 



g. Connect the dc voltmeter between chassis ground 
and the case of Q1890. 



h. ADJUST — SYMM adjustment R1838 for a meter 
reading of 55 V, ±3 V (see Fig. 9-33). 



i. Move the time-base unit to the B HORIZ compart- 
ment. Set the display mode to time base and the triggering 
source to internal. 



j. Disconnect all test equipment. 



7. ADJUST BEAM 2 INTENSIFIED Z-AXIS 

a. Install the delaying time-base unit in the A HORIZ 
compartment and set to 10 ns/div. Set the time-base unit to 
1 (us/div. 



b. Set the 7844/R7844 HORIZONTAL MODE to: 

BEAM 1 B 

BEAM 2 A 



c. Connect the probe to TP2086. 



d. Set the Beam 2 INTENSITY fully counterclockwise 
and set a base line reference on the test oscilloscope. 



e. Set the BEAM 2 INTENSITY for a 20-volt pulse. 



f. Set the delaying time-base unit to delayed mode. 



g. Check — A 6-volt pedestal atop the 20-volt pulse. (See 
the note in step 4.) 



h. ADJUST — R381 on the LOGIC circuit board for a 6- 
volt pedestal atop the 20-volt pulse. 



i. Set the delaying time-base unit to non-delaying mode 
and remove. 



j. Disconnect all test equipment. 



NOTE 

If it is necessary to change any of the adjustments in 
the following steps, complete the remainder of the Z- 
Axis and CRT Display procedure. Then recheck all of 
the steps following this note, to ensure that interac- 
tion between adjustments has not occurred. 



REV JUN 1981 



5-13 




Adjustment Procedure — 7844/R7844 Service 



8. ADJUST BEAM 2 FOCUS RANGE (R2436, R2576) 

a. Set the time-base unit sweep rate for 1 ms/div. 



b. Connect the CALIBRATOR output to the amplifier 
unit. 



c. Set the amplitier unit deflection factor for a 1 div cen- 
tered display. Set the time-base unit triggering for a stable 
display and position as necessary. 



d. Set the front-panel BEAM 2 FOCUS control to 
midrange. 



e. Check — Square wave should be well defined with 
sharp edges at medium INTENSITY. 



f. ADJUST — Foe 2 adjustment R2436 (see Fig. 9-29) 
and Astig 2 adjustment R2576 to obtain optimum display 
definition (see Fig. 9-31). The square-wave trace should be 
as thin as possible, but not elongated. 



9. ADJUST BEAM 1 FOCUS RANGE (R2416, 
R2578) 

a. Move the amplifier to the LEFT VERT compartment. 
Move the time-base unit to the A HORIZ compartment. 



b. Set the amplifier unit deflection factor for a 1 div cen- 
tered display. 



c. Set the front-panel BEAM 1 FOCUS control to 
midrange. 



d. Check — Square wave should be well defined with 
sharp edges at medium intensity. 



e. ADJUST — Foe 1 adjustment R2416 (see Fig. 9-29) 
and Astig 1 adjustment R2578 to obtain optimum display 
definition (see Fig. 9-31). The square-wave trace should be 
as thin as possible, but not elongated. 



f. Disconnect the CALIBRATOR signal. 



10. ADJUST BEAM 1 EDGE FOCUS (R2578, R2556) 

a. Replace the amplifier unit installed in the LEFT VERT 
compartment with the Calibration Fixture Signal 
Standardizer. 



b. Set the Signal Standardizer Test switch to Vert or 
Horiz + Step Resp and the Rep Rate switch to 1 MHz. 
Adjust the time-base unit for 2 jus/div in the time-base mode 
and set the triggering for a stable display from the internal 
source. Set the Signal Standardizer Amplitude control for a 
0.5 div display. Position the display to graticule center. 



c. Set the BEAM 1 FOCUS control for a well-defined 
display. 



d. Check — Position the 0.5 div display to the top and 
then to the bottom graticule divisions and check for a well- 
defined display. 



NOTE 

if the parameters given in part d are satisfactorily met, 
omit the remaining steps of the Beam 1 Edge Focus 
Procedure. 



e. Set the time-base unit to amplifier mode and trigger- 
ing source to external. Set the Calibration Fixture Signal 
Standardizer to Freq. Resp. 



f. Set the BEAM 1 INTENSITY control for a visible dot (a 
dim intensity setting will be more usable than a bright inten- 
sity setting). 



g. Position the dot to the bottom division of the graticule 
(centered horizontally). 



h. ADJUST — Astig 1 adjustment R2578 (see Fig. 9-31) 
for the smallest symmetrical dot. 



i. Position the dot to graticule center. 



j. ADJUST — Vert 1 adjustment R2556 for the smallest 
symmetrical dot (see Fig. 9-31). 



k. INTERACTION — Repeat parts f through j until no fur- 
ther improvement in the smallness and symmetry of the dot 
is observed. 



I. Check — Repeat parts b through d. 



5-14 



REV JUN 1981 




Adjustment Procedure — 7844/R7844 Service 



1 1 . ADJUST BEAM 2 EDGE FOCUS (R2576, R2552) 

a. Move the Calibration Fixture Signal Standardizer to 
the RIGHT VERT compartment and the time-base unit to 
the B HGRIZ compartment. 



b. Sei: the Signal Standardizer Test switch to Vert or 
Horiz + Step Resp and the Rep Rate switch to 1 MHz. 
Adjust the time-base unit for 2 ^s/div in the time-base mode 
and set the triggering for a stable display from the internal 
source. Set the Signal Standardizer Amplitude control for a 
0.5 div display to graticule center. 



c. Set the BEAM 2 FOCUS control for a well-defined 
display. 



d. Check — Position the 0.5 div display to the top and 
then to the bottom graticule divisions and check for a well- 
defined display. 



NOTE 

If the parameters given in step d are satisfactorily met, 
omit the remaining steps of the Beam 2 Edge Focus 
Procedure. 



e. Set the time-base unit to the amplifier mode and the 
triggering source to external. Set the Calibration Fixture 
Signal Standardizer to Freq Resp. 



f. Set the BEAM 2 INTENSITY control for a visible dot (a 
dim intensity setting will be more usable than a bright inten- 
sity setting). 



g. Position the dot to the bottom division of the graticule 
(centered horizontally). 



h. ADJUST — Astig 2 adjustment R2576 (see Fig. 9-31) 
for the smallest symmetrical dot. 



i. Position the dot to graticule center. 



j. ADJUST — Vert 2 adjustment R2552 for the smallest 
symmetrical dot (see Fig. 9-31). 



k. INTERACTION — Repeat steps f through j until no fur- 
ther improvement in the smallness and symmetry of the dot 
is observed. 



I. Check — Repeat parts b through d. 



m. Replace the Calibration Fixture Signal Standardizer, 
installed in the LEFT VERT compartment with the amplifier 
unit. 



12. ADJUST BEAM 2 AUTO-FOCUS OPERATION 
(R2484, R2493) 

a. Set the time-base unit sweep rate for 0.02 ^s/div, 
mode to time base, the position control to midrange, and 
magnifier to XI 0. 



b. Set the BEAM 1 INTENSITY control fully 
counterclockwise. 



c. Connect the dc voltmeter between TP2472 and chas- 
sis ground (see Fig. 9-31). 



d. Check— Meter reading for +123 V within 3 V. 



e. ADJUST — Beam 2 Output Level adjustment R2484 
for a meter reading of +123 V within 3 V (see Fig. 9-31). 



f. Disconnect the voltmeter. 



g. Turn BEAM 2 INTENSITY fully clockwise. 



h. Connect a 2 ns time-mark generator signal to the in- 
put of the amplifier unit. Connect 0.1 ns time mark triggers 
to the time-base external trigger input. Set triggering for the 
auto mode with ac coupling from the external source. 



i. Set the front-panel BEAM 2 FOCUS control for opti- 
mum trace definition. 



j. ADJUST — Beam 2 Focus Gain R2493 for best defini- 
tion of the trace (see Fig. 9-31). 



k. Set the front-panel BEAM 2 INTENSITY fully 
counterclockwise. 



I. Without disturbing the settings of associated equip- 
ment, move the amplifier unit to the LEFT VERT compart- 
ment. Move the time-base unit to the A HORIZ 
compartment. 



REV JUN 1981 



5-15 




Adjustment Procedure — 7844/R7844 Service 



13. ADJUST BEAM 1 AUTO-FOCUS OPERATION 
(R2454, R2463) 

a. Set the front-panel BEAM 1 INTENSITY control fully 
counterclockwise. 



b. Connect the dc voltmeter between TP2455 and chas- 
sis ground (see Fig. 9-31). 



c. Check — Meter reading for +123 V within 3 V. 



d. ADJUST — Beam 1 Output Level adjustment R2454 
for a meter reading of +123 V within 3 V (see Fig. 9-31). 



e. Disconnect the voltmeter. 



f. Turn E3EAM 1 INTENSITY fully clockwise. 



g. ADJUST — Beam 1 Focus Gain adjustment R2463 for 
best definition of trace (see Fig. 9-31). 



h. Disconnect associated equipment and set the time- 
base unit magnifier to XI. 



14. ADJUST TRACE ALIGNMENT 

a. Position Beam 1 trace to the center horizontal 
graticule lines. 



b. Set the time-base unit sweep rate for 0.1 ms/div. 



c. ADJUST — Front-panel TRACE ROTATION adjust- 
ment so that the trace aligns with the center horizontal 
graticule line (optimum setting of TRACE ROTATION may 
need to be made with a trace on both beam 1 and beam 2). 



15. ADJUST BEAM 1 GEOMETRY (R2568, R1985, 
R1976, R2560) (R4985, R4976 For instruments 7844 
SN B1 10000-above; R7844 SN BlOOOOO-above) 

a. Move the amplifier unit to the LEFT VERT compart- 
ment and the time-base unit to the A HORIZ compartment. 



b. Apply 1 ms time markers to the amplifier unit. 



c. Apply 1 ms time-marker triggers to the time-base ex- 
ternal trigger input. 



d. Set the time-base triggering for auto mode, with ac 
coupling from the external source at a sweep rate of 
0.5 ms/div. 



e. Set the amplifier unit deflection factor and position 
controls so that the time marks extend above and below the 
top and bottom of the graticule. 



f. Set the time-base unit variable time/division control to 
obtain 1 marker for each major graticule division. 



g. Set the time-mark generator for 0.1 ms. 



h. Check — That the vertical bowing and tilt of the mark- 
er display is less than 0.1 div (each 0.1 ms marker repre- 
sents 0.1 div). 



i. ADJUST — Bowing 1 adjustment R2568 for minimum 
bowing of the markers near the center graticule line (see Fig. 
9-31). 



j. ADJUST — Geom A adjustment R1985 (R4985) and 
Geom B adjustment R1976 (R4976) to minimize the bowing 
and keystoning shape of the marker display (see Fig. 9-33). 
Geom A affects the right-hand side of the marker display 
and Geom B affects the left-hand side of the marker display. 



k. ADJUST— Geom 1 adjusment R2560 (affects overall 
geometry) for no greater than 0.1 div bowing and tilt (see 
Fig. 9-31). 



16. ADJUST BEAM 2 GEOMETRY (R2572, R2985, 
R2976, R2564) (R5976, R5985 For instruments 7844 
SN B1 10000-above; R7844 SN BlOOOOO-above) 

a. Move the amplifier unit to the RIGHT VERT compart- 
ment and the time-base unit to the B HORIZ compartment. 



b. Set the time-mark generator for 1 ms markers. 



c. Set the amplifier unit deflection factor and position 
controls so that the time-markers extend above and below 
the top and bottom of the graticule. 



d. Set the time-base unit variable time/division control to 
obtain 1 marker for each major graticule division. 



e. Set the time-mark generator for 0.1 ms markers. 



5-16 



REV JUN 1981 




Adjustment Procedure — 7844/R7844 Service 



f. Check — That the vertical bowing and tilt of the marker 
display is less than 0.1 div (each 0.1 ms marker represents 
0.1 div). 



g. ADJUST — Bowing 2 adjustment R2572 for minimum 
bowing of the markers near the center graticule line (see Fig. 
9-31). 



h. ADJUST— Geom A adjustment R2985 (R5985) and 
Geom B adjustment R2976 (R5976) to minimize the bowing 
and keystoning shape of the marker display (see Fig. 9-34). 
Geom A adjustment R2985 (R5985) affects the left-hand 
side of the marker display and Geom B adjustment R2976 
(R5976) affects the right-hand side of the marker display. 



i. ADJUST — Geom 2 adjustment R2564 for not greater 
than 0.1 div of bowing and tilt (see Fig. 9-31). 



j. Set the time-base unit variable time/division control to 
the calibrated position. Remove all signal connections. 



17 A. ADJUST BEAM 1 AND BEAM 2 CRT 
CENTERING (R4988, R5988) (For instruments 7844 
SN B1 ICOOO-above; R7844 SN BlOOOOO-above) 

a. Install a time-base unit in the LEFT VERT compart- 
ment and an amplifier unit in the A HORIZ compartment. 



b. Set the time-base unit sweep rate for 1 ms/div, trig- 
gering for auto mode with ac coupling from the internal 
source. 



NOTE 

Use jumper P4800 and P5800 (stored on blank pins) 
on the Horizontal board for the shorting procedure. 



c. Short together the Beam 1 horizontal deflection plates 
by inserting P4800 on J4899 (see Fig. 9-33A). 



NOTE 

The label on the crt shield will have a recommended 
number (one for each beam) preceded by a — or a 
sign. These signs are referenced to the center vertical 
graticule line (center graticule line being 0). If there is 
no label attached to the crt shield, the correct setting 
is the center vertical graticule line. 



d. Check — Vertical trace must be within 0.1 div of the 
beam 1 recommended setting noted on the crt centering 
data (label attached on crt shield). 



e. ADJUST — Beam 1 Crt Ctr adjustment R4988 to align 
the vertical trace with the recommended setting indicated on 
the crt centering data label (see Fig. 9-33A). 



f. Remove the jumper plug. 



g. Move the time-base unit to the RIGHT VERT com- 
partment and the amplifier to the B HORIZ compartment. 



h. Short together the Beam 2 horizontal deflection 
plates by inserting P5800 on J5899 (see Fig. 9-33A). 



i. Check — Vertical trace must be within 0.1 div of the 
beam 2 recommended setting noted on the crt centering 
data label. 



j. ADJUST — Beam 2 Crt Ctr adjustment R5988 to align 
the vertical trace with the recommended setting indicated on 
the crt centering data label (see Fig. 9-34A). 



k. Remove the jumper plug and return it to the storage 

pins. 



17B. ADJUST BEAM 1 AND BEAM 2 CRT 
CENTERING (R1988, R2988) (For instruments 7844 
SN B109999-below; R7844 SN B099999-below) 

a. Move the time-base unit to the LEFT VERT compart- 
ment and the amplifier unit to the A HORIZ compartment. 



b. Set the time-base unit sweep rate for 1 ms/div, trig- 
gering for auto mode with ac coupling from the internal 
source. 



c. Short together the Beam 1 horizontal deflection plates 
by connecting a jumper wire between the transistor cases of 
Q1920 and Q1890 (see Fig. 9-33). 



NOTE 

The label on the crt shield will have a recommended 
number (one for each beam) preceded by a - or a + 
sign. These signs are referenced to the center vertical 
graticule line (center graticule line being 0). If there is 
no label attached to the crt shield, the correct setting 
is the center vertical graticule line. 



REV JUN 1981 



5-17 




Adjustment Procedure — 7844/R7844 Service 



d. Check — Vertical trace must be within 0.1 div of the 
beam 1 recommended setting noted on the crt centering 
data label (label located on crt shield). 



e. ADJUST — Beam 1 Crt Ctr adjustment R1988 to align 
the vertical trace with the recommended setting indicated on 
the crt centering data label (see Fig. 9-33). 



f. Remove the jumper wire. 



g. Move: the time-base unit to the RIGHT VERT com- 
partment and the amplifier unit to the B HORIZ 
compartment. 



h. Short together the Beam 2 horizontal deflection 
plates by connecting a jumper wire between the transistor 
cases of Q2920 and Q2890 (see Fig. 9-34). 



i. Check — Vertical trace must be within 0.1 div of the 
beam 2 recommended setting noted on the crt centering 
data label. 



j. ADJUST — Beam 2 Crt Ctr adjustment R2988 to align 
the vertical trace with the recommended setting indicated on 
the crt centering data label (see Fig. 9-34). 



k. Remove the jumper wire. 



18. ADJUST Y-AXIS ALIGNMENT (R386) 

a. Center the trace horizontally and vertically with the 
amplifier and time-base unit position controls. 



b. ADJUST — V-Axis Alignment adjustment R386 to 
align the vertical trace with the center vertical graticule line 
(see Fig. 9-32). 



c. Move the time-base unit to the LEFT VERT compart- 
ment and the amplifier unit to the A HORIZ compartment. 



d. Center the trace horizontally and vertically with the 
amplifier and time-base unit position controls. 



e. ADJUST — Y-Axis Alignment adjustment R386 to 
align the vertical trace with the center vertical graticule line 
(see Fig. 9-32). 



f. INTERACTION — Steps b and e interact. Optimize the 
adjustment of R386 to minimize the difference in the align- 
ment of both displays with the center vertical graticule line. 



5-18 



REV JUN 1981 




Adjustment Procedure — 7844/R7844 Service 



C. CALIBRATOR AND OUTPUT SIGNALS 



Equipment Required 




Precision dc voltmeter 


18-inch, 50 It cable with bnc connectors 


Amplifier plug-in unit 


42-inch, 50 ft cable (two) with bnc connectors 


Time-mark generator 


Bnc T connector 


Time-base plug-in unit with delaying mode 


Three-inch screwdriver 


Dual-trace test oscilloscope 


Low-capacitance screwdriver 



BEFORE YOU BEGIN, see al ^ : i ucations a in the Diagrams section. 



1. ADJUST CALIBRATOR OUTPUT VOLTAGE 
(R91 5) 

a. Set both the 4 V and 0.4 V CALIBRATOR push but- 
tons to the depressed position. 



b. Connect the precision dc voltmeter to the CALIBRA- 
TOR output connector. 



c. Check — Meter reading for 0.4008 V within 0.0004 V. 



d. ADJUST — 0.4 V adjustment R915 for a meter read- 
ing of exactly 0.4008 V (see Fig. 9-35). 



e. Disconnect the precision dc voltmeter. 



2. ADJUST CALIBRATOR 1 kHz REPETITION 
RATE (Ri)04) 



NOTE 

A frequency counter with an accuracy of at least 0. 1 % 
may be used to adjust the calibrator repetition rate. 



a. Connect 1 ms time markers to the test oscilloscope 
external trigger input and to the non-inverting vertical chan- 



nel of the test oscilloscope (use a bnc T connector). Connect 
the 7844/R7844 4 V CALIBRATOR signal to the other verti- 
cal channel. 



b. Set the test oscilloscope triggering to auto mode with 
ac coupling from the external source and adjust the trigger- 
ing level for a stable display. Set the sweep rate for 1 ms/div 
in the alternate vertical mode. 



c. Set the test oscilloscope deflection factors to display 
2 div of CALIBRATOR signal and 1 div of time-marker 

signal. 



d. Set the test oscilloscope vertical mode to add and the 
sweep rate for 0.2 s/div. 



e. Check — Time required for the 1 ms time marks to drift 
from the positive level of the CALIBRATOR signal to the 
negative level and back to the positive level must be at least 
0.4 s (2 div). This time can be measured directly from the 
display by observing the number of divisions that the mark- 
ers move across the display area before it returns to the 
positive level. 



f. ADJUST — 1 kHz adjustment R904 for minimum drift 
(see Fig. 9-53). 



g. Disconnect all test equipment. 



REV JUN 1981 



5-19 




Adjustment Procedure — 7844/R7844 Service 



D. TRIGGER SELECTION 



Equipment Required 

Sampling sweep unit 

Calibration fixture signal standardizer 

Calibration fixture plug-in extender 


42-inch, 50 fi cable (two required) with bnc connectors 
18-inch, 50 if cable with bnc connectors 


Control Settings 






INVERT CH 2 (IN) 


Set the 7844/R7844 front-panel controls as follows: 


MODE 


ADD 






SEC/DIV 


.2 MS 


A TRIG SOURCE 


LEFT 


SWP 


DELAYING (IN) 


B TRIG SOURCE 


RIGHT 


AUTO TRIG 


OUT 


BEAM 1 




+ SLOPE 


IN 


INTENSITY 


As desired 


REP 


IN 


VERTICAL MODE 


LEFT 


INT CH 1 


IN 


BEAMFINDER 


Push button out 


HF SYNC 


OUT 


HORIZONTAL MODE 


A 






BEAM 2 




e. Install the signal standardizer in the LEFT VERT com- 


INTENSITY 


As desired 


partment and set 


the TEST switch to TRIGGERING + 


VERTICAL MODE 


RIGHT 


STEP RESP. Set the REP RATE to 1 MHz. 


BEAMFINDER 


Push button out 






HOFIZONTAL MODE 


A 







f. Set the 7844/R7844 A TRIG SOURCE to LEFT. 



ADJUST TRIGGER RESPONSE 



NOTE 

The trigger step response aberrations adjustments af- 
fect the bandwidth of the trigger system. The adjust- 
ments parts of the procedure should be skipped if the 
aberrations are within the limits given. 



a. Inst all the sampling unit into the test oscilloscope. 



b. Install the plug-in extender in the A HORIZ compart- 
ment and set A TRIG SOURCE to LEFT. 



c. Connect the cable from A20 of the plug-in extender to 
the CH 1 input of the sampling unit. Connect the cable from 
B20 to the CH 2 input. 



d. Set the sampling unit as follows: 

CH 1 50 mV/div 

DC OFFSET to midrange 
CH 2 50 mV/div 

DC OFFSET to midrange 



g. Using the POSITION and AMPLITUDE controls of the 
signal standardizer and the TRIGGERING LEVEL and 
SCAN controls of the sampling unit, set up a stable, 6 div 
display on the test oscilloscope. 



h. On the sampling unit set the DELAYING Sweep to 
10 ^s/div, the DELAYED Sweep to 1 ns, and the SWP con- 
trol to DELAYED (OUT). 



i. Adjust the DELAY ZERO (1st DOT) and the DELAY 
TIME MULT (2nd DOT) controls to display the leading edge 
of the waveform. 



j. Check — Aberrations of <15% (0.9 div). 



k. ADJUST — R446 for aberrations of <15% (0.9 div). 



I. Move the signal standardizer to the RIGHT VERT 
compartment. 



m. Set A TRIG SOURCE to RIGHT. 



n. Check — Aberrations of <15% (0.9 div). 



5-20 



REV JUN 1981 





o. ADJUST— R546 for aberrations of <15% (0.9 div). 

p. Move the plug-in extender to the B HORIZ 
compartment. 

q. Set B TRIG SOURCE to RIGHT. 

r. Check — Aberrations of <15% (0.9 div). 

s. ADJUST — R516 for aberrations of <15% (0.9 div). 



Adjustment Procedure — 7844/R7844 Service 

t. Move the signal standardizer to the LEFT VERT 

compartment. 

u. Set B TRIG SOURCE to LEFT. 

v. Check — Aberrations of <15% (0.9 div). 

w. ADJUST — R416 for aberrations of <15% (0.9 div). 



REV JUN ' 981 



5-21 




Adjustment Procedure — 7844/R7844 Service 



E. HORIZONTAL SYSTEM 

(For instruments 7844 SN B1 10000-above; R7844 SN BlOOOOO-above) 



Equipment Required 




Calibration fixture signal standardizer 


Dc voltmeter 


Amplifier plug-in unit 


42-inch, 50 12 cable (two required) with bnc connectors 


Time-base plug-in unit 


Three-inch screwdriver 


Time-mark generator 





BEFORE YOU BEGIN, see 
Control Settings 

Set the 7844/R7844 front-panel controls as follows: 



A TRIG SOURCE 


LEFT 


B TRIG SOURCE 


RIGHT 


BEAM 1 


INTENSITY 


Midrange 


FOCUS 


As desired 


VERTICAL MODE 


LEFT 


BEAMFINDER 


Push button out 


HORIZONTAL MODE 


A 


HORIZ SEP (1) 


Midrange 


BEAM 2 


INTENSITY 


Fully counter- 
clockwise 


FOCUS 


As desired 


VERTICAL MODE 


RIGHT 


BEAMFINDER 


Push button out 


HORIZONTAL MODE 


B 



1. ADJUST BEAM 1 HORIZONTAL CENTERING 
(R4816, R4840) 

a. Install a time-base unit in the LEFT VERT compart- 
ment. Install the calibration fixture signal standardizer in the 
A HORIZ compartment. 



b. Set Ihe calibration fixture Test switch to Vert or Horiz 
Com Mode and the time-base unit for a free-running 1 n s/div 
sweep. 



c. ADJUST— The BEAM 1 INTENSITY control for a us- 
able display. 



NOTE 

Use jumper P4800 (stored on blank pins) on the Hori- 
zontal board for the shorting procedure. 



in the Diagrams section. 

e. Connect the dc voltmeter between the cases of 
Q4876 and Q4896 (see Fig. 9-36A). 



f. Check — The meter reading of 0 volt. 



g. ADJUST — The Lim Ctr adjustment R4840 for 0 volt. 



h. Remove the jumper plug and return it to the storage 
pins. 



i. Check — Horizontal centering of the trace is within 0.5 
div of the center graticule line. 



j. Disconnect the cable of J4868. 



k. ADJUST — The Horiz Ctr adjustment R4816 to align 
the trace with the vertical graticule line (see Fig. 9-36A). 



I. Move the calibration fixture to the B HORIZ compart- 
ment and change the BEAM 1 HORIZONTAL MODE switch 
to B. 



m. Check — Horizontal centering of the trace is within 0.5 
div of the center graticule line. 



n. ADJUST — If necessary, compromise the setting of 
the Horiz Ctr adjustment R4816 for optimum centering of 
both A and B compartments. 



o. Reconnect the cable to J4868. 



5-22 



REV JUN 1981 





Adjustment Procedure — 7844/R7844 Service 



2. ADJUST BEAM 1 HORIZONTAL AMPLIFIER 
GAIN (R4820) 

a. Install the calibration fixture in the B HORIZ compart- 
ment and set the BEAM 1 HORIZONTAL MODE switch 
to B. 



b. Set the calibration fixture Test switch to Vert or Horiz 
Gain and Rep Rate to 10 kHz. Align the trace with the cen- 
ter vertical graticule line with the calibration fixture Position 
control. 



c. Check — One trace per graticule division within 0.05 
div over the center 8 vertical graticule divisions. 



d. ADJUST — Horizontal Gain R4820 for 1 div between 
each of the 9 displayed traces (see Fig. 9-36A). 



e. Move the calibration fixture to the A HORIZ compart- 
ment and set the BEAM 1 HORIZONTAL MODE switch 
to A. 



f. Check — One trace per graticule division within 0.08 
div over the center 8 vertical graticule divisions. 



g. INTERACTION — If necessary, compromise the set- 
ting of the Horiz Gain adjustment R4820 for optimum gain of 
both horizontal compartments. 

3. ADJUST BEAM 1 HIGH-FREQUENCY TIMING 
(C4823, C4850, AND C4860) 

a. Remove the calibration fixture from the A or B HORIZ 
compartment. 

b. Move the time-base unit to the B HORIZ compart- 
ment and set the BEAM 1 HORIZONTAL MODE switch 
to B. 



c. Install an amplifier unit in the LEFT VERT 
compartment. 

d. Set the time-base unit triggering for auto mode, ac 
coupled from the internal source at a sweep rate of 
1 ms/div. 



e. Connect 1 ms markers from the time-mark generator 
to the amplifier input and adjust the amplifier unit deflection 
factor for a 3 div display. 



f. Set B TRIG SOURCE to LEFT and the time-base unit 
triggering controls for a stable display. 



g. Set the time-base unit sweep-calibration adjustment 
(front panel) for 1 marker at each major graticule division 
between the second and tenth graticule lines (center 8 div). 



h. Connect the trigger output of the time-mark generator 
to the time-base unit external trigger input with a 50 co- 
axial cable. 



i. Set the time-base unit triggering for auto mode ac 
coupled from the external source at a sweep rate of 
5 ns/div. Set the time-mark generator for 5 ns markers. 



j. Set the time-base triggering controls for a stable 
display. 



k. Check — High-Frequency timing over the center 8 div 
within 0.32 div (4%). 



I. ADJUST — High-Frequency compensation adjust- 

ments C4850 and C4860 for minimum timing error over the 
center 8 vertical graticule divisions. 



m. Set the time-mark generator for 2 ns markers and the 
time-base unit for 1 ns/div sweep rate. 



n. Set the time-base triggering controls for a stable 
display. 



o. Check— High-Frequency timing over the center 8 div 
(one cycle every two divisions) within 0.32 div (4%). 



p. ADJUST— High-Frequency compensation adjustment 
C4823 for minimum timing error over the center 8 vertical 
graticule divisions. 



q. Repeat part I if necessary. 



r. INTERACTION — Check 5 ns and 1 ns timing and re- 
peat parts i through p if necessary. 



s. Disconnect all cables. 



REV JUN 1981 



5-23 




Adjustment Procedure — 7844/R7844 Service 



4. ADJUST BEAM 2 HORIZONTAL CENTERING 
(R5840, R5816) 

a. Install a time-base unit in the RIGHT VERT compart- 
ment. Inslall the calibration fixture in the A HORIZ 
compartment. 



b. Set the BEAM 2 HORIZONTAL MODE switch to A. 



c. Check — One trace per graticule division within 0.05 
div over the center 8 vertical graticule divisions. 



d. ADJUST — Horizontal Gain R5820 for 1 div between 
each of the 9 displayed traces (see Fig. 9-37 A). 



e. Move the calibration fixture to the A HORIZ compart- 
ment and set the BEAM 2 HORIZONTAL MODE switch 
to A. 



f. Check — One trace per graticule division within 0.08 
div over the center 8 vertical graticule divisions. 



g. INTERACTION — If necessary, compromise the set- 
ting of the Horiz Gain adjustment R5820 for optimum gain of 
both horizontal compartments. 



5. ADJUST BEAM 2 HORIZONTAL AMPLIFIER 
GAIN (R5820). 

a. Install the calibration fixture in the B HORIZ compart- 
ment and set the BEAM 2 HORIZONTAL MODE switch to 
B. 



b. Set the calibration fixture Test switch to Vert or Horiz 
Gain and Rep Rate to 1 0 kHz. Align the trace with the cen- 
ter vertical graticule line with the calibration fixture Position 
control. 



c. Check — One trace per graticule division within 0.05 
div over the center 8 vertical graticule divisions. 



d. ADJUST — Horizontal Gain R5820 for 1 div between 
each of the 9 displayed traces (see Fig. 9-37 A). 



e. Move the calibration fixture to the A HORIZ compart- 
ment and set the BEAM 2 HORIZONTAL MODE switch to 
A. 



f. Check — One trace per graticule division within 
0.08 div over the center 8 vertical graticule divisions. 



g. INTERACTION — If necessary, compromise the set- 
ting of the Horiz Gain adjustment R5820 for optimum gain of 
both horizontal compartments. 



6. ADJUST BEAM 2 HIGH-FREQUENCY TIMING 
(C5823, C5850 and C5860) 

a. Remove the calibration fixture from the A or B 
compartment. 



b. Move the time-base unit to the B HORIZ compart- 
ment and set the BEAM 2 HORIZONTAL MODE switch 
to B. 



NOTE 

High-frequency timing accuracy may be affected by 
improper adjustment of the Horizontal Plate Average 
voltage. Refer to step B17A for adjustment 
procedure. 



c. Install an amplifier unit in the RIGHT VERT 
compartment. 



d. Set the time-base unit triggering for auto mode, ac 
coupled from the internal source at a sweep rate of 
1 ms/div. 



e. Connect 1 ms markers from the time-mark generator 
to the amplifier input and adjust the amplifier unit deflection 
factor for a 3 div display. 



f. Set the B TRIG SOURCE to RIGHT and the time-base 
triggering controls for a stable display. 



g. Set the time-base unit sweep-calibration adjustment 
(front panel) for 1 marker at each major graticule division 
between the second and tenth graticule lines (center 8 div). 



h. Connect the trigger output of the time-mark generator 
to the time-base unit external trigger input with a bnc cable. 



i. Set the time-base unit triggering for auto mode, ac 
coupled from the external source at a sweep rate of 
5 ns/div. Set the time-mark generator for 5 ns markers. 



5-24 



REV JUN 1981 




Adjustment Procedure — 7844/R7844 Service 



j. Set the time-base triggering controls for a stable 
display. 



k. Check — High-Frequency timing over the center 8 div 
within 0.32 div (4%). 



I. ADJUST — High-frequency compensation adjustments 
C5850 and C5860 for minimum timing error over the center 
8 vertical graticule divisions. 



m. Set the time-mark generator for 2 ns markers and the 
time-base unit for 1 ns/div sweep rate. 



n. Set the time-base triggering controls for a stable 
display. 



o. Check — High-frequency timing over the center 8 div 
(one cycle every two divisions) within 0.32 div (4%). 



p. ADJUST — High-Frequency compensation adjustment 
C5823 for minimum timing error over the center 8 vertical 
graticule divisions. 



q. INTERACTION — Check 5 ns and 1 ns timing and re- 
peat parts i through p if necessary. 



r. Disconnect all cables. 



REV JUN 1981 



5-25 




Adjustment Procedure — 7844/R7844 Service 



F. HORIZONTAL SYSTEM 

(For instruments 7844 SN B109999-below; R7844 SN B099999-below) 



Equipment Required 

Calibration Fixture Signal 18-inch, 50 ft cable with bnc connectors 

Standardizer 

Amplifier plug-in unit Three-inch screwdriver 

Time-base plug-in unit 18-inch cable with bsm female and bnc male connectors 

Time-mark generator 

42-inch, 50 ft cable with bnc connectors 



BEFORE YOU BEGIN, see in the Diagrams section. 



Control Settings 

Set the 7844/R7844 front-panel controls as follows: 



A TRIG SOURCE 


LEFT 


B TRIG SOURCE 


RIGHT 


BEAM 1 


INTENSITY 


Midrange 


FOCJS 


As desired 


VERTICAL MODE 


LEFT 


BEAMFINDER 


Push button out 


HORIZONTAL MODE 


A 


HORIZ SEP (1) 


Midrange 


BEAM 2 


INTENSITY 


Midrange 


FOCUS 


As desired 


VERTICAL MODE 


RIGHT 


BEAMFINDER 


Push button out 


HORIZONTAL MODE 


B 



1. ADJUST BEAM 1 AND BEAM 2 HORIZONTAL 
AMPLIFIER GAIN (R2940, R2816, R1940 and 
R1816) 

a. Install a time-base unit in the RIGFIT VERT compart- 
ment. Install the calibration fixture signal standardizer in the 
B FIORIZ compartment. 



b. Set the calibration fixture Test switch to Vert or Horiz 
Com Mode and the time-base unit for a free-running sweep. 



c. Check — Vertical trace is within 0.5 div of the center 
vertical graticule line. 



d. ADJUST — Beam 2 Horiz Ctr adjustment R2940 to 
align the trace with the center vertical graticule line (see Fig. 
9-37B). 



e Set the calibration fixture test switch to Vert or Horiz 
Gain and the Rep Rate to 1 MHz. align the bright center 
trace with the center vertical graticule line with the calibra- 
tion fixture Position control. 



f. Check — One trace per graticule division within 
0.01 div over the center 8 vertical graticule divisions. 



g. ADJUST — Beam 2 Horiz Gain adjustment R2816 for 
1 div between each of the 9 displayed traces (see Fig. 9-37). 



h. Set the BEAM 2 INTENSITY control fully 
counterclockwise. 



i. Move the time-base unit to the LEFT VERT 
compartment. 

j. Set the BEAM 1 HORIZONTAL MODE switch to B. 



k. Set the calibration fixture Test switch to Com Mode 
and the BEAM 1 INTENSITY control for a usable display. 



I. Check — Horizontal centering of the trace is within 
0.5 div of the center graticule line. 

m ADJUST — Beam 1 Horiz Ctr adjustment R1940 to 
align the vertical trace with the center vertical graticule line 
(see Fig. 9-36). 

n. Set the calibration fixture Test switch to Vert or Horiz 
Gain. 



o. Check — One trace per graticule division within 
0.01 div over the center 8 vertical graticule divisions. 



5-26 



REV JUN 1981 





Adjustment Procedure — 7844/R7844 Service 



p. ADJUST — Beam 1 Horiz Gain R1816 for 1 div be- 
tween each of the 9 displayed traces (see Fig. 9-36). 



q. INTERACTION — Significant adjustment of the Beam 
1 and Beam 2 Horizontal Gain and centering adjustments 
may affect the adjustment of the Z-Axis and Geometry ad- 
justments in section B. 



2. ADJUST BEAM 1 HIGH-FREQUENCY TIMING 
(Cl 904, Cl 934, Cl 862, R1860, R1870, R1873) 

a. Remove the calibration fixture from the B HORIZ 
compartment. 



b. Move the time-base unit to the B HORIZ 
compartment. 



c. Install an amplifier unit in the LEFT VERT 
compartment. 



d. Set the time-base unit triggering for auto mode ac 
coupled from the internal source at a sweep rate of 1 ns/div. 



e. Set the BEAM 2 INTENSITY control fully counter- 
clockwise and the BEAM 1 INTENSITY control for a usable 
display. 



f. Connect 1 ms markers from the time-mark generator 
to the amplifier unit input and adjust the amplifier unit deflec- 
tion factor for a 2 div display. 



g. Set the B TRIG SOURCE switch to LEFT and the 
time-base unit triggering controls for a stable display. 



h. Position the first marker to the extreme left line on the 
graticule. 



i. Set the time-base unit sweep-calibration adjustment 
for 1 marker at each major graticule division between the 
second and tenth graticule lines (center 8 divisions). 



j. Check — Refer to the time-base unit instruction manual 
for performance check or calibration procedures for check- 
ing high-frequency timing and linearity. Use the procedures 
and limits given for the three fastest sweep rates that do not 
exceed 1 ns/div. If the given limits are met, omit the remain- 
der of this step. 



k. Disconnect the time-mark generator and remove the 
amplifier unit. 



I. Move the time-base unit to the LEFT VERT compart- 
ment and install the calibration fixture in the B HORIZ 
compartment. 



m. Set the BEAM 2 INTENSITY control fully counter- 
clockwise and the BEAM 1 INTENSITY control for a usable 
display. 



n. Set the time-base unit triggering for auto mode ac 
coupled from the external source at a sweep rate of 
0.2 ns/div. 



o. Connect the calibration fixture Test Out to the time- 
base unit external trigger input with a bsm female to bnc 
mate cable. 



p. Set the calibration fixture Test switch to Vert or Horiz 
+ Step Resp and the Amplitude control for a 3 div display. 
Position the display to graticule center. 



q. Set the time-base unit triggering controls for a stable 
display. 



r. ADJUST — BEAM 1 Horizontal Amplifier High-Fre- 
quency compensation adjustments (as given in Table 5-4) 
for optimum square-wave response (see Fig. 9-36). 



s. Check — Displayed pulse aberrations not to exceed 
0.15 div with total peak-to-peak aberrations not to exceed 
0.2 div. Refer to Table 5-4. 



t. Check — High-frequency timing. Repeat part j. 



u. INTERACTION — If the high-frequency timing param- 
eters cannot be met, repeat parts k through s. 



v. Remove the time-base unit and the calibration fixture. 



3. ADJUST BEAM 2 HIGH-FREQUENCY TIMING 
(C2904, C2934, C2862, R2860, R2870, R2873) 

a. Install an amplifier unit in the RIGHT VERT 
compartment. 



REV JUN 1981 



5-27 




Adjustment Procedure— 7844/R7844 Service 



Table 5-4 

HORIZONTAL SYSTEM HIGH-FREQUENCY 
COMPENSATION 

(For instruments 7844 SN B109999-below; 
R7844 SN B09999-beiow) 





Sweep 


Area of 


Adjustment 


j Rate 


Maximum Effect 



When used with time-base units having sweep rates of 
2 ns/div and slower. 





Beam 1 


Beam 2 






5 ns Cal 


Cl 904 
Cl 934 


C2904 

C2934 


5 ns/div 


5 ns/div timing 


2 ns Cal 


Cl 862 


C2862 


2 ns/div 


2 ns/div timing 


Lin A 
Lin B 


F1 1860 
F1 1870 


R2860 

R2870 


2 ns/div 


2 ns/div linearity 


1 ns Cal 


F1 1873 


R2873 


Effect of adjustment not 
noticeable with sweep rates 
below 1 ns/div. 



When used with time-base units having sweep rates to 
1 ns/div and faster. 



5 ns Cal 


Cl 904 
Cl 934 


C2904 

C2934 


5 ns/div 


5 ns/div timing 


2 ns Cal 


Cl 862 


C2862 


2 ns/div 


2 ns/div timing 


Lin A 
Lin B 


FI 860 
FI 870 


R2860 

R2870 


1 ns/div a 

2 ns/div a 
linearity 


First half of 
sweep 2 ns/div 


1 ns Cal 


FI 873 


R2873 


1 ns/div 


Last half of 
sweep 



a Lin A and Lin B adjustment primarily affect 1 ns timing, but 
also affect 2 ns timing to a lesser degree. 



e. Connect 1 ms markers from the time-mark generator 
to the amplifier unit. 



f. Set the B TRIG SOURCE switch to RIGHT and the 
time-base unit triggering controls for a stable display. 



g. Position the first marker to the extreme left line on the 
graticule. 



h. Set the time-base unit sweep-calibration adjustment 
for 1 marker at each major graticule division, between the 
second and tenth graticule lines (center 8 div). 



i. Check — Refer to the time-base unit instruction manual 
for performance check or calibration procedures for check- 
ing high-frequency timing and linearity. Use the procedures 
and limits given for the three fastest sweep rates that do not 
exceed 1 ns/div. If the given limits are not met, omit the 
remainder of this step. 



j. Remove the time-base unit and install the calibraton 
fixture in the B HORIZ compartment. 



k. Remove the amplifier unit and install the time-base 
unit in the RIGHT VERT compartment. 



I. Set the time-base unit sweep rate for 0.2 ms/div and 
triggering for auto mode ac coupled from the external 
source. 



m. Connect the calibration fixture Trig Out to the time- 
base unit external trigger input with a bsm female to bnc 
male adapter. 



n. Set the calibration fixture test switch to Vert or Horiz 
+ Step Resp. Amplitude control for 3 div of display, and 
position the display to graticule center. 



b. Install the time-base unit in the B HORIZ 
compartment. 



c. Set the time-base unit sweep rate for 1 ms/div and 
triggering for auto mode ac coupled from the internal 
source. 



d. Set the BEAM 1 INTENSITY control fully counter- 
clockwise and the BEAM 2 INTENSITY control for a usable 
display. 



o. Set the BEAM 2 INTENSITY control and the timebase 
unit triggering controls for a usable display. 



p. ADJUST — BEAM 2 Horizontal Amplifier High-Fre- 
quency Compensation adjustments (as given in Table 5-4) 
for optimum square-wave response (see Fig. 9-37). 



q. Check — Displayed pulse leading edge aberrations not 
to exceed 0.15 div with total peak-to-peak aberrations not 
to exceed 0.2 div. Refer to Table 5-4. 



5-28 



REV JUN 1981 




Adjustment Procedure — 7844/R7844 Service 



r. Check — High frequency timing. Repeat part i. 



s. INTERACTION — If the high-frequency timing param- 
eters cannot be met, repeat parts j through p. 

t. Remove all test equipment. 



REV JUN 1981 



5-29 




Adjustment Procedure — 7844/R7844 Service 



G. VERTICAL SYSTEM 



Equipment Required 




Time-base plug-in unit 


Low-capacitance screwdriver 


Amplifier plug-in unit 


bnc female to dual clip leads 


Calibration fixture signal standardizer 


nylon tuning tool 


High-frequency signal generator 




Three-inch screwdriver 





BEFORE YOU BEGIN, see 



in the Diagrams section. 



Control Settings 

Set the 7844/R7844 front-panel controls as follows: 



CALIBRATOR (1 kHz) 


4 V (push button in) 


A TRIG SOURCE 


LEFT 


B TRIG SOURCE 


RIGHT 


BEAM 1 


INTENSITY 


Midrange 


FOCUS 


As desired 


VERTICAL MODE 


LEFT 


BEAMFINDER 


Push button out 


HORIZONTAL MODE 


A 


VERT SEP (1) 


Midrange 


BEAM 2 


INTENSITY 


Fully counterclock- 
wise 


VERTICAL MODE 


RIGHT 


BEAMFINDER 


Push button out 


(LOCKS IN) 


HORIZONTAL MODE 


A 



1. ADJUST BEAM 1 VERTICAL CENTERING 
(R1714) 

a. Install a time-base unit in the A HORIZ compartment. 



b. Set the time-base unit sweep rate for 10 ^s/div and 
triggering for auto mode ac coupled from the internal 
source. 



c. Set the BEAM 1 INTENSITY control for a visible dis- 
play of the trace. 



d. Install the calibration fixture signal standardizer in the 
LEFT VERT compartment with the Test switch set to Vert 
or Horiz Com Mode. 



e. Check — Displayed trace is within 0.5 div of the center 
horizontal graticule line. 



f. ADJUST — Beam 1 Vert Ctr adjustment R1714 to po- 
sition the beam 1 trace to the center horizontal graticule line 
(see Fig. 9-39). 



g. Check— (delete with Option 21) Trace remains within 
0.5 div of the center horizontal graticule line while simulta- 
neously switching the VERTICAL MODE switches to BEAM 
1 RIGHT and BEAM 2 LEFT. 



h. ADJUST — (delete with Option 21) Vert Ctr adjust- 
ment R1714 so that the displayed trace remains within 
0.5 div of the center horizontal graticule line while simulta- 
neously switching the VERTICAL MODE switches to BEAM 
1 RIGHT and BEAM 2 LEFT (see Fig. 9-39). 



2. ADJUST BEAM 2 VERTICAL CENTERING 
(R2714) 

a. Move the time-base unit to the B HORIZ 
compartment. 



b. Move the calibration fixture to the RIGHT VERT 
compartment. 



c. (delete with Option 21) Set the VERTICAL MODE 
switch to BEAM 1 LEFT and BEAM 2 RIGHT. 



d. Set the BEAM 2 HORIZONTAL MODE switch to B 
and the BEAM 2 INTENSITY control for a visible display. 



e. Check — Displayed trace is within 0.5 div of the center 
horizontal graticule line. 



f. ADJUST — BEAM 2 Vert Ctr adjustment R2714 to po- 
sition the BEAM 2 trace to the center graticule line (see Fig. 
9-40). 



5-30 



REV JUN 1981 




Adjustment Procedure — 7844/R7844 Service 



g. CHECK — (delete with Option 21) Trace remains with- 
in 0.5 div of the center horizontal graticule line while switch- 
ing the BEAM 2 VERTICAL MODE switch from RIGHT to 
LEFT. 



h. ADJUST — (delete with Option 21) Beam 2 Vert Ctr 
adjustment R2714 so that the displayed trace remains with- 
in 0.5 div of the center horizontal graticule line while switch- 
ing the BEAM 2 VERTICAL MODE SWITCH from RIGHT to 
LEFT. (See Fig. 9-40.) 



NOTE 

Step 3 applies only to Option 21. 



3, ADJUST BEAM 1 AND BEAM 2 VERTICAL 
AMPLIFIER GAIN (R1730, R2730) 

a. Move the calibration fixture to the LEFT VERT 
compartment. 



b. Move the time-base unit to the A HORIZ 
compartment. 



c. Set the calibration fixture Test switch to Vert or Horiz 
Gain with the Rep Rate switch set to 1 MHz. 



d. Position the display with the calibration fixture Posi- 
tion control to align the bright center trace with the center 
horizontal graticule line. 



e. Check — One trace per graticule division within 
0.01 div over the center 6 horizontal graticule divisions. 



f. ADJUST — Beam 1 Vert Gain adjustment R1730 for 
1 div between each of the center 7 displayed traces (see Fig. 
9-39). 



g. Move the calibration fixture to the RIGHT VERT 
compartment. 



h. Move the time-base unit to the B HORIZ 
compartment. 



i. Position the display with the calibration fixture Position 
control to align the bright center trace with the center hori- 
zontal graticule line. 



j. Check— One trace per graticule division within 
0.01 div over the center 6 horizontal graticule divisions. 



k. ADJUST — Beam 2 Vert Gain adjustment R2730 for 
1 div between each of the center 7 displayed traces (see Fig. 
9-40). 



NOTE 

Omit step 4 for Option 21. 



4. ADJUST BEAM 1 AND BEAM 2 VERTICAL 
CROSSOVER GAIN (R2730, R1730, R3619, R3664) 

a. Set the calibration fixture test switch to Vert or Horiz 
Gain with the Rep Rate switch set to 1 MHz. 



b. Set the BEAM 2 VERTICAL MODE switch to RIGHT. 



c. Position the display with the calibration fixture Posi- 
tion control to align the bright center trace with the center 
horizontal graticule line. 



d. Check — One trace per graticule division within 
0.01 div over the center 6 horizontal graticule divisions. 



e. ADJUST — Beam 2 Vert Gain R2730 for 1 div be- 
tween each of the center 7 displayed traces (see Fig. 9-40). 



f. Move the time-base unit to the A HORIZ 
compartment. 



g. Set the BEAM 1 VERTICAL MODE switich to RIGHT. 



h. Position the display with the VERT SEP (1) control to 
align the bright center trace with the center horizontal 
graticule line. 



i. Check — One trace per graticule division within 0.01 div 
over the center 6 horizontal graticule divisions. 



j. ADJUST— Beam 1 Vert Gain adjustment R1730 for 
1 div between each of the center 7 displayed traces (see Fig. 
9-39). 



REV JUN 1981 



5-31 




Adjustment Procedure — 7844/R7844 Service 



k. Move the time-base unit to the B HORIZ 
compartment. 



I. Move the calibration fixture to the LEFT VERT 
compartment. 



m. Set the BEAM 1 and BEAM 2 VERTICAL MODE 
switches to LEFT. 



n. Position the display with the calibration fixture Posi- 
tion control to align the bright center trace with the center 
horizontal graticule line. 



o. Check — One trace per graticule division with 0.01 div 
over the center 6 horizontal graticule divisions. 



p. ADJUST — Beam 2 Left Gain adjustment R3664 for 
1 div between each of the center 7 displayed traces (see Fig. 
9-38). 



q. Move the time-base unit to the A HORIZ 
compartment. 



r. Position the display with the VERT SEP (1) control to 
align the bright center trace with the center horizontal 
graticule line. 



s. Check — One trace per graticule division within 
0.01 div over the center 6 horizontal graticule divisions (po- 
sition as necessary). 



t. ADJUST — Beam 1 Left Gain adjustment R3619 for 
1 div between each of the center 7 displayed traces (see Fig. 
9-38). 



5. ADJUST BEAM 1 AND BEAM 2 AUX Y GAIN 
(R2716, R1716) 

a. Connect the 4 V CALIBRATOR signal to both TP10 
and TP13 with a 50 n cable and bnc to clip lead adapter 
(simuiltaniously fasten the signal lead to TP10 and TP13 
and the shield lead to the chassis, see Fig. 9-41). 



b. Set the VERTICAL MODE switches to BEAM 1 LEFT 
and BEAM 2 RIGHT (delete with Option 21). 



c. Move the time-base unit to the B HORIZ 
compartment. 



d. Remove the calibration fixture and install an amplifier 
unit in the RIGHT VERT compartment. 



e. Check — Display amplitude for 4.2 div within 0.1 div 
(position as necessary). 



f. ADJUST — BEAM 2 Vertical Aux Y Gain adjustment 
R2716 for a 4.2 div display within 0.1 div (see Fig. 9-40). 



g. Move the amplifier unit to the LEFT VERT compart- 
ment and move the time-base unit to the A HORIZ 
compartment. 



h. Check — Display amplitude for 4.2 div display within 
0.1 div (see Fig. 9-39). 



i. ADJUST — Beam 1 Vertical Aux Y Gain adjustment 
R1716 for a 4.2 div display within 0.1 div (see Fig. 9-39). 



j. Remove the CALIBRATOR signal. 

NOTE 

(Effective Serial Number B050000-up; 7844) (Effective 
Serial Number B040000-up; R7844) Refer to 
Recalibration After Repair in the Maintenance section 
for an input compensation adjustment procedure. This 
procedure should be used when integrated circuits are 
replaced on the Crossover Vertical Interface, the 
Beam 1 Vertical Amplifier, or the Beam 2 Vertical Am- 
plifier boards. 

6. ADJUST BEAM 1 VERTICAL HIGH-FREQUENCY 
COMPENSATION (R1749, R1764, R1743, R1758, 
L1667, Cl 658, R1658, L1730, L1731). 

a. Move the Calibration Fixture to the LEFT Vert com- 
partment and the time-base unit to the A HORIZ 
compartment. 



b. Set the calibration fixture Test switch to Vert or Horiz 
+ Step Resp. Rep Rate switch to 1 kHz and adjust the 
Amplitude control for a 6 div display. 



c. Set the time-base unit sweep rate for 0.5 ms/div and 
triggering for auto mode, ac coupled from the internal 
source. Adjust trigger level and position controls for a stable 
centered display. 



d. Check — Displayed pulse for optimum flat top within 
0.06 div. 



5-32 



REV JUN 1981 




Adjustment Procedure — 7844/R7844 Service 



e. ADJUST — LF Comp 1 adjustment R1749 and LF 
Comp 2 adjustment R1764 for flat top within 0.06 div (see 
Fig. 9-39). 



f. Set the Calibration Fixture Rep Rate switch to 1 MHz 
and the time-base unit for a sweep rate of 10 ns/div. 



g. Check — Displayed pulse for optimum square corner 
and flat top with total peak-to-peak aberrations within 
0.36 div. 



h. ADJUST — High-frequency compensation (as given in 
Table 5-5) for optimum square leading corner and flat top 
with aberrations within 0.36 div peak-to-peak. Use the low- 
capacitance screwdriver to adjust variable capacitors. Re- 
peat the complete adjustment procedure several times to 
obtain optimum adjustment (See Fig. 9-39). 



Table 5-5 

BEAM 1 HIGH-FREQUENCY COMPENSATION 



Adjustment 


Primary Area of 
Pulse Affected 


Best Sweep 
Rate 


R1743 

R1758 


First 1 00 ns 


j 

1 0 ns/div 


LI 667 
Cl 658 


First 2 ns 


2 ns/div 


R1658 


First 5 ns 


2 ns/div 


Position crt ver- 


At 5 ns from 


10 ns/div 


tical deflection 
leads to reduce 
aberrations. The 
deflection leads 
connect to crt 
pins directly in 
front of the 
Vertical Ampli- 
fier boards. 


front corner 




LI 730 
LI 731 

(Longer leads will 
increase the front 
corner spike) 


First 1 ns 


1 ns/div 



7. ADJUST BEAM 2 VERTICAL HIGH-FREQUENCY 
COMPENSATION (R2764, R2749, R2743, R2758, 
L2667, C2658, R2658, L2730, L2731) 

a. Move the calibration fixture to the RIGHT VERT com- 
partment and the time-base unit to the B HORIZ 
compartment. 



b. Set the calibration fixture Test switch to Vert or Horiz 
+ Step Resp. Rep Rate switch to 1 kHz and adjust the 
Amplitude control for a 6 div display. 



c. Set the time-base unit sweep rate for 0.5 ms/div and 
triggering for auto mode, ac coupled from the internal 
source. Adjust the trigger level and position controls for a 
stable centered display. 



d. Check — Displayed pulse for optimum flat top within 
0.06 div. 



e. ADJUST — LF Comp 1 adjustment R2749 and LF 
Comp 2 adjustment R2764 (see Fig. 9-40) for flat top within 
0.06 div. 



f. Set the time-base unit triggering for auto mode, ac 
coupled from the internal source, and sweep rate for 
10 ns/div. Adjust the trigger level and position controls for a 
stable centered display. 



g. Set the calibration fixture Rep Rate switch to 1 MHz. 



h. Check — For optimum square corner and flat top on 
the displayed pulse with total peak-to-peak aberrations 
within 0.36 div. 



i. ADJUST — High-frequency compensation (as given in 
Table 5-6) for optimum square leading corner and flat top 
with aberrations not to exceed 0.36 div peak-to-peak. Use 
the low-capacitance screwdriver to adjust variable capaci- 
tors. Repeat the complete adjustment procedure several 
times to obtain optimum adjustment (see Fig. 9-40). 



REV JUN 1981 



5-33 




Adjustment Procedure — 7844/R7844 Service 



Table 5-6 

BEAM 2 HIGH-FREQUENCY COMPENSATION 



Adjustment 


Primary Area of 
Pulse Affected 


Best Sweep 
Rate 


R2743 

R2758 


First 100 ns 


10 ns/div 


L2667 

C2658 


First 2 ns 


2 ns/div 


R2658 


First 5 ns 


2 ns/div 


Position crt ver- 


At 5 ns from 


10 ns/div 


tical deflection 
leads to reduce 
aberrations. The 
deflection leads 
connect to crt 
pins directly in 
front of the 
Vertical Ampli- 
fier boards. 


from front corner 




L2730 

L2731 

(Longer leads will 
increase the front 
corner spike) 


First 1 ns 


1 ns/div 



5-34 



REV JUN 1981 




Adjustment Procedure — 7844/R7844 Service 



H. READOUT SYSTEM 



Equipment Required 

Amplifier plug-in unit 
Time-base plug-in unit 
Three-inch screwdriver 



BEFORE YOU BEGIN, see ADJUSTMENT LOCATIONS 6 in the Diagrams section. 



Control Settings 

Set the 7844/R7844 front-panel controls as follows: 



READOUT 

EXTERNAL-BEAM 2 
GATED 
BEAM 1 
INTENSITY 
FOCUS 

VERTICAL MODE 
BEAMFINDER 
(LOCKS IN) 
HORIZONTAL MODE 
BEAM 2 

INTENSITY 
VERTICAL MODE 
BEAMFINDER 
(LOCKS IN) 
HORIZONTAL MODE 



BEAM 2 GATED 
(push button out) 

Midrange 

Midrange 

LEFT 

Push button out 
A 

Midrange 

RIGHT 

Push button out 
B 



1. ADJUST VERTICAL SEPARATION (R2291, 
R2700, R2804, R2809) 

a. Set the POWER switch to the off position and remove 
Q2225 (see Fig. 9-42) from its socket. Turn the POWER 
switch ON. 



ooodpoodpooo 


7000 


7000 


oooc 


oooc 


0000 


7000 


7000 


















— 


r 


















- 
















— 




















l 


















1— 




























■ 












]' 


























rwyi 




oooc 


rrm 


<y*Yli 


Wl 










. j 











1676-5 



Fig. 5-1. Readout display with Q2225 removed. 



d. ADJUST — Readout Vertical Separation adjustment 
R2291 (see Fig. 9-42) and RO Center R2700 (see Fig. 9-44) 
to position the two rows of readout characters to the middle 
of the top and bottom divisions of the graticule. 



NOTE 

The adjustment of Aux Y Gain (R2716; see Vertical 
System calibration) must be correct before adjusting 
R2291. 



b. Set the READOUT INTENSITY control for visible 
characters (all zeros). 



c. Check — Crt display for two rows of zeros, 40 zeros to 
a row with no character overlap. The two rows of zeros are 
located vertically in the middle of the top and bottom divi- 
sions of the graticule (see Fig. 5-1.). 



e. Check — Crt display for two rows of zeros, 40 zeros to 
each row with no character overlap. Total length of each 
row of characters is between 9.5 and 10.5 div. There is one 
zero or less to the right of the last graticule line, and one 
zero or less to the left of the first graticule line. 



NOTE 

The tolerances provided in this step are guides to cor- 
rect instrument operation. 



NOTE 

The Beam 2 Horizontal Centering (R2940) and Hori- 
zontal Gain (R2816) adjustments must be correct be- 
fore adjusting R2804 and R2809 (see Horizontal 
System calibration). 



REV JUN 1981 



5-35 






Adjustment Procedure — 7844/R7844 Service 



f. ADJUST— Beam 2 Horizontal RC> Ctr R2804 
(Readout Center) to center the READOUT DISPLAY. Adjust 
RO Gain R2809 (Readout Gain) so that the length of 
each row of characters is between 9.5 and 10.5 div (see 
Fig. 9-43). 



g. Turr the POWER off. Install Q2225 and turn the 
POWER ON. 



h. Install the amplifier unit in the RIGHT VERT compart- 
ment and ihe time-base unit in the B HORIZ compartment. 

i. CHECK — Readout display for 0.02 div or less of jitter 
at all sweep rates 

j. INTERACTION-Adjustment of R2764 affects readout 
vertical jitter. Refer to the Beam 2 Vertical High-Frequency 
Compensation step of the Vertical System calibration. 



2. ADJUST FULL CHARACTER SCAN AND 
CHARACTER HEIGHT (R2128, R2273) 

a. Set the amplifier unit for a deflection factor of 
50 mv/div 



b. Set :he time-base unit triggering for a free-running 
trace at 1 ms/div. 



c. Check — Displayed characters for completeness with 
out overscanning (overscanning causes a bright dot to ap- 
pear where the traces overlap) 



d. ADJUST — Full Character Scan adjustment R2128 for 
fully scanned characters without overscanning. 



The m and 5 will shown the most change (see Fig. 9-42). 



e. ADJUST — Character Height adjustment R2273 for 
readout character size as desired (see Fig. 9-42). 



3. ADJUST COLUMN MATCH AND ROW MATCH 
(R2214, R2183) 

a. Press and hold the amplifier unit trace-identify button. 

b. Check — Readout display for correct indication of 
"IDENTIFY". If the readout display either blinks or is incor- 
rect, adjustment is required. 

c ADJUST— Column Match adjustment R2214 and 
Row Match adjustment R2183 for correct readout of IDEN- 
TIFY” (see Fig. 9-42). Set these adjustments to the center of 
the adjustment range that provides correct readout indica- 
tion. Release the amplifier unit trace-identify button. 



This completes the 7844/R7844 Adjustment procedure 



5 36 



REV JUN 1981 



Sec tion 6 — 7844/FI7844 Service 



MAINTENANCE 



INTRODUCTION 

This section of the manual contains information for per- 
forming preventive maintenance, corrective maintenance, or 
troubleshooting of the 7844/R7844. 



Panel Removal 

WARNING | 



Dangerous potentials exist at several points through- 
out this instrument. When the instrument is operated 
with the covers removed, do not touch exposed con- 
nections or components. Some transistors have 
voltages present on their cases. Disconnect power be- 
fore cleaning the instrument or replacing parts. 



This side and bottom panels provide protection to per- 
sonnel from operating potentials present within the instru- 
ment. In addition, they reduce emi radiation from the 
instrument and emi interference from other equipment. 



7844 (Bench Model). The side and bottom panels are 
held in place by slotted fasteners. To remove these panels, 
turn each fastener counterclockwise a quarter turn with a 
large screwdriver, coin, or similar device. Then, lift the side 
panel away from the instrument. 



R7844 (Rackmounted Model). The top and bottom cov- 
ers are held in place with ten screws on each cover. To 
remove the covers, remove the securing screws and lift the 
cover from the instrument. 



A panel on the left side of the instrument, held in place 
with six screws, allows access to the Beam I Vertical ampli- 
fier board. Refer to Fig. 9-2 in the Diagrams section ol this 
manual for location of the circuit board. 



PREVENTIVE MAINTENANCE 

Preventive maintenance consists of cleaning, visual in- 
spection, lubrication, etc. Preventive maintenance per- 
formed on a regular basis may prevent instrument 
breakdown and will improve the reliability of this instrument. 
The severity of the environment to which the 7844/R7844 is 
subjected determines the frequency of maintenance. A con- 
venient time to perform preventive maintenance is preceding 
recalibration of the instrument. 



Cleaning 

The 7844/R7844 should be cleaned as often as operating 
conditions require. Accumulation of dirt in the instrument 
can cause overheating and component breakdown. Dirt on 
components acts as an insulating blanket and prevents effi- 
cient heat dissipation. It also provides an electrical conduc- 
tion path, which may result in instrument failure. The side 
panels reduce the amount of dust reaching the interior of the 
instrument. Operation without the panels in place necessi- 
tates more frequent cleaning. 



S CAUTION \ 

S, 

Avoid the use of chemical cleaning agents that might 
damage the plastics used in this instrument. In par- 
ticular, avoid chemicals that contain benzene, toluene, 
xylene, acetone, or similar solvents. 



Air Filter (R7844 only). The air filter should be visually 
checked every few weeks and cleaned or replaced if dirty. 
More frequent inspections are required under severe operat- 
ing conditions. If the filter is to be replaced, order new filters 
from your local Tektronix Field Office or representative; or- 
der by Tektronix Part No. 378-0810-00. The following pro- 
cedure is suggested for cleaning the filter. 



1. Remove the filter by pulling it out of the retaining 
frame on the rear panel. Be careful not to drop any of :he 
accumulated dirt into the instrument. 



2. Flush the loose dirt from the filter with a stream of hot 
water. 



REV JUN 1981 



6-1 




Maintenance — 7844/R7844 Service 



3. Place the filter in a solution of miid detergent and hot 
water and let it soak for several minutes. 



4. Squeeze the filter to wash out any remaining dirt. 



5. Rinse the filter in dean water and let it dry 



6. Coat the dry filter with an air-filter coating (available 
from air conditioner suppliers or order Tektronix Part No. 
006-0580-00). 



7 . Let the filter thoroughly dry. 



8. Reinstall the filter in the retaining frame. 



Exerior. Loose dust accumulated on the outside of the 
7844/R7844 can be removed with a soft cloth or small 
brush. The brush is particularly useful for dislodging dirt on 
and around the front-panel controls. Dirt that remains can 
be removed with a soft cloth dampened in a mild detergent 
and water solution. Abrasive cleaners should not be used. 



Crt. Clean the plastic light filter, implosion shield, and the 
crt face with a soft, lint-free cloth dampened with denatured 
alcohol. 



The crt mesh filter (furnished with Option 03 only) can be 
cleaned as follows: 

1 Hold the mesh filter in a vertical position and brush 
lightly with a soft No. 7 water-color brush to remove 'ight 
coatings cf dust or lint. 



2. Greasy residues or dried-on dirt can be removed with 
a solution of warm water and a neutral-pH liquid detergent. 
Use the b-ush to lightly scrub the filter. 



3. Rinse the filter thoroughly in clean water and allow it 
to air dry. 



4 If any lint or dirt remains, use clean low-pressure £iir to 
remove it. Do not use tweezers or other hard cleaning tools 
on the filter, as the special finish may be damaged. 

5. Whan not in use, store the mesh filter in a lint-free 
dust-proof container, such as a plastic bag. 



Interior. Dust in the interior of the instrument should be 
removed occasionally due to its electrical conductivity under 
high humidity conditions The best way to clean the interior 
is to blow off the accumulated dust with dry. low-pressure 
air. Remove any dirt that remains with a soft brush or a 
cloth dampened with a mild detergent and water solution. A 
cotton-tipped applicator is useful for cleaning in narrow 
spaces. 



Visual Inspection 

The 7844/R7844 should be inspected occasionally fcr 
such defects as broken connections, improperly seated 
semiconductors, damaged or mproperly installed circu t 
boards, and heat-damaged parts. 



The corrective procedure for most visible defects is obvi- 
ous; however, particular care must be taken if heat- 
damaged components are found. Overheating usually 
indicates other trouble in the instrument; therefore, it is im- 
portant that the cause of overheating be corrected to pre - 
vent recurrence of the damage. 



Semiconductor Checks 

Periodic checks of the semiconductors in the 
7844/R7844 are not recommended. The best check cf 
semiconductor performance is actual operation in the instru- 
ment. More details on checking semiconductor operation 
are given under Troubleshooting. 



Recalibration 

To ensure accurate measurements, check tne calibration 
of this instrument after each 1000 hours of operation or 
every six months if used infrequently. In addition, replace- 
ment of components may necessitate recalibrahon of the 
affeefed circuits. The calibration procedure can also be help- 
ful in localizing certain troubles in the instrument. In some 
cases, minor troubles may be revealed or corrected by 
recalibration. 



TROUBLESHOOTING 

The following information is provided to facilitate 
troubleshooting of the 7844 F17844. Information contained 
in other sections of this manual should be used along with 
the following information to aid in locating the defective 
component. An understanding of the circuit operation is very 
helpful in locating troubles, particularly where integrated cir- 
cuits are used. 



6 2 



REV JUN 1981 




Maintenance — 7844/R7844 Service 



Troubleshooting Equipment 

The following equipment is useful for troubleshooting the 
7844/R7344 Oscilloscope: 

Transistor Tester 



Description: Dynamic-type tester. 



Purpose: Test semiconductors. 



Recommended type: TEKTRONIX 577/177 Curve Trac- 
er, TEKTRONIX 576 Curve Tracer, 7CT1N Curve Tracer 
plug-in unit and a 7000-Series Oscilloscope system, or a 
5CT1N Curve Tracer plug-in unit and a 5000-Series 
Oscilloscope. 

Multimeter 



Description: 10 MO input impedance and 0 to 500 volts 
range, ac and dc; ohmmeter, 0 to 50 MO, accuracy, within 

0.1%. Test probes must be insulated to prevent accidental 
shorting. 



Purpose: Check voltages and resistance. 
Test Oscilloscope 



Descriotion: Frequency response dc to 100 MHz mini- 
mum; deflection factor, 5 mV to 5 V/div and 1 mA to 1 A/div. 
A 10 X, 10 MO voltage probe should be used to reduce cir- 
cuit loading for voltage measurement. 



Purpose: Check operating waveforms. 

Recommended type: Refer to the Tektronix Products 
catalog for applicable oscilloscope system. 



Variable Autotransformer 



Description; Output variable from 0 to 140 V, 10 A mini- 
mum rating. Must have three-wire power cord, plug, and 
receptacle. 



Purpose: Vary input line voltage when troubleshooting in 
the power supply. 



Recommended type: General Radio W10MT3W Variac 
Autotransformer modified with three-wire power cord. 



Troubleshooting Techniques 

This troubleshooting procedure is arranged to check the 
simple trouble possibilities before proceeding with extensive 
troubleshooting. The first few checks ensure proper connec- 
tion, operation, and calibration. If the trouble is not located 
by these checks, the remaining steps aid in locating the de- 
fective component. When the defective component is locat- 
ed, it should be replaced following the replacement 
procedures given under Corrective Maintenance. 



1 . Check Control Settings 

Incorrect control settings can indicate a trouble that does 
not exist. If there is any question about the correct function 
or operation of any control, see the Operators Manual. 



2. Check Associated Equipment 

Before proceeding with troubleshooting of the 
7844/R7844, check that the equipment used with this in- 
strument is operating correctly. Check that the signal is 
properly connected and that the interconnecting cables are 
not defective. Also, check the power source. The associated 
plug-in units can be checked for proper operation by substi- 
tuting other units that are known to be operating properly 
(preferably of the same types.) If the trouble persists after 
substitution, the 7844/R7844 is probably at fault. 



3. Visual Check 

Visually check the portion of the instrument in which the 
trouble is located. Many troubles can be located by visible 
defects such as unsoldered connections, broken wires, 
damaged circuit boards, damaged components, etc. 



4. Check Instrument Calibration 

Check the calibration of this instrument, or the affected 
circuit if the trouble appears in one circuit. The apparent 
trouble may only be a result of misadjustment or may be 
corrected by calibration. Complete calibration instructions 
are given in the Calibration section. 



5. Isolate Trouble to a Circuit 

To isolate trouble to a particular circuit, note the trouble 
symptom. The symptom often identifies the circuit in which 
the trouble is located. For example, poor focus indicates 
that the crt circuit is probably at fault. When trouble symp- 
toms appear in more than one circuit, check affected circuits 
by taking voltage and waveform readings. Also check for 
the correct output signals at the rear-panel output connec- 
tors with a test oscilloscope. If the signal is correct, the 
circuit is working correctly up to that point. For example, 
correct sawtooth output indicates that the time-base unit 
and sawtooth output portion of the Output Signals circuit is 
operating correctly. If a malfunction in the Readout System 



REV JUN 1981 



6-3 




CIRCUIT ISOLATION TROUBLESHOOTING CHART 



Maintenance — 7844/R7844 Service 




Fig. 6-1. 7844/R7844 troubleshooting chart. 



6-4 



REEV JUN 1981 





























Maintenance — 7844/R7844 Service 



<o 




Fig. 6-1 (continued). 7844/R7844 troubleshooting chart. 



REV JUN 1981 



6-5 

























Maintenance — 7844/R7844 Service 



is suspected of causing trouble to appear in the Z-Axis Am- 
plifier, Vertical Amplifier, or Horizontal Amplifier circuits, the 
trouble can be localized by removing the Readout System 
circuit board. This board can be removed without signifi- 
cantly affecting the operation of other circuits in the 
instrument. 



Incorrect operation of all circuits often indicates trouble in 
the power supply. Check first for correct voltage of the indi- 
vidual supplies. However, a defective component elsewhere 
in the instrument can appear as a power-supply trouble and 
may also affect the operation of other circuits. 



If incorrect operation of the power supplies is suspected, 
connect the 7844/R7844 to a variable autotransformer. 
Then Chech: each power supply for correct regulation with a 
dc voltmeter (0.1% accuracy), and correct ripple with a test 
oscilloscope. Vary the autotransformer throughout the regu- 
lating range of the 7844/R7844 and check that it is within 
the power supply tolerances given in Table 6-1. The 
voltages in Table 6-1 are measured between the power sup- 
ply test points and chassis ground. Power supply test points 
are shown on the Adjustment Locations pullout at the rear 
of this manual. If a power supply voltage is within the toler- 
ance in Tab le 6-1 , the supply can be assumed to be working 
correctly. II outside the given tolerance, the supply may be 
misadjusted or operating incorrectly. Use the procedure giv- 
en in the Adjustment Procedure section to adjust the power 
supply voltage. 



Table 6-1 

POWER SUPPLY TOLERANCE 



Power 

Supply 


Test Point 


Output Voltage 
Tolerance 


Typical Ripple 
(Peak-to-Peak) 


-50 V 


-50 TP 


±0.1 V 


5 mV 


-15 V 


-15 TP 


±0.3 V 


2 mV 


+ 5 V 


+ 5 TP 


±0.15 V 


2 mV 


+ 15 V 


+ 15 TP 


±0.3 V 


2 mV 


+ 50 V 


+ 50 TP 


±0.6 V 


5 mV 


+ 130 V 


+ 130 TP 


±5.2 V 


300 mV 



Figure 6-1 provides a guide for locating a defective cir- 
cuit. Start at the top of the chart and perform the checks 
given on the left side of the page until a step is found that 
does not produce the indicated results. Further checks, or 
the circuit in which the trouble is probably located, are listed 
to the right of the step. This chart does not include checks 
for all possible defects; use steps 6 and 7 in such cases. 



After the defective circuit has been located, proceed with 
steps 6 and 7 to locate the defective component(s). 



6. Check Voltages and Waveforms 

Often the defective component can be located by check- 
ing for the correct voltage or waveform in the circuit. Refer 
to the diagrams section at the rear of the manual for correct 
voltages and waveforms. 



7. Check Individual Components 

The following procedures describe methods of checking 
individual components in the 7844/R7844. Two lead compo- 
nents that are soldered in place are best checked by first 
disconnecting one end. This isolates the measurement from 
the effects of surrounding circuitry. 




Disconnect the power source before removing or re- 
placing semiconductors. 



Semiconductors. A good check of transistor operation 
is actual performance under operating conditions. A transis- 
tor can be most effectively checked by substituting a new 
component or one which has been checked previously. 
However, be sure that circuit conditions are not such that a 
replacement transistor might also be damaged. If substitute 
transistors are not available, use a dynamic tester. Static- 
type testers are not recommended, since they do not check 
operation under simulated operating conditions 



Integrated circuits (IC's) can be checked with a 
voltmeter, test oscilloscope, or by direct substitution. A 
good understanding of circuit operation is desirable when 
troubleshooting circuits using IC's. Use care when checking 
voltages and waveforms around the IC's so that adjacent 
leads are not shorted together. A convenient means of clip- 
ping a test probe to the 14- and 16-pin IC's is with an 1C test 
clip. This device also serves as an extraction tool. The lead 
configuration for the semiconductors used in this instrument 
are shown on a pull-out page in the front of the diagrams 
section. 



Diodes. A diode can be checked for an open or for a 
short circuit by measuring the resistance between terminals 
with an ohmmeter set to the R x 1 k scale. The diode resis- 
tance should be very high in one direction and very low 
when the meter leads are reversed. Do not check tunnel 
diodes or back diodes with an ohmmeter. 




Do not use an ohmmeter scale that has a high internal 
current. High currents may damage the diode. 



6-6 



REV JUN 1981 





Maintenance — 7844/R7844 Service 



The cathode end of each glass-encased diode is indicat- 
ed by a stripe, a series of stripes, or a dot. For most silicon 
or germanium diodes with a series of stripes, the color code 
identifies the three significant digits of the Tektronix Part 
Number using the resistor color-code system. The cathode 
and anode ends of metal-encased diodes can be identified 
by the diode symbol marked on the body. 



Resistors. Check the resistors with an ohmmeter. See 
the Replaceable Electrical Parts list for the tolerance of the 
resistors used in this instrument. Resistors normally do not 
need to be replaced unless the measured value varies wide- 
ly from the specified value. 



Inductors. Check for open inductors by checking con- 
tinuity with an ohmmeter. Shorted or partially shorted induc- 
tors can usually be found by checking the waveform 
response when high-frequency signals are passed through 
the circuit. Partial shorting often reduces high-frequency re- 
sponse (roll off). 



Capacitors. A leaky or shorted capacitor can usually be 
detected by checking resistance with an ohmmeter on the 
highest scale. Do not exceed the voltage rating of the ca- 
pacitor. The resistance reading should be high after initial 
charge of the capacitor. An open capacitor can best be de- 
tected with a capacitance meter or by checking if the capaci- 
tor passes ac signals. 



8. Repair and Readjust the Circuit 

If any defective parts are located, follow the replacement 
procedures given in this section. Be sure to check the per- 
formance of any circuit that has been repaired or had any 
electrical components replaced. 



CORRECTIVE MAINTENANCE 

Corrective maintenance consists of component replace- 
ment and instrument repair. Special techniques required to 
replace components in this instrument are given here. 



Obtaining Replacement Parts 

All electrical and mechanical part replacements for the 
7844/R7844 can be obtained through your Tektronix Field 
Office or representative. However, many of the standard 
electronic components can be obtained locally in less time 
than is required to order them from Tektronix, Inc. Before 
purchasirg or ordering replacement parts, check the parts 
list for value, tolerance, rating, and description. 



NOTE 

When selecting replacement parts, it is important to 
remember that the physical size and shape of a com- 
ponent may affect its performance in the instrument, 
particularly at high frequencies. All replacement parts 
should be direct replacements unless it is known that 
a different component will not adversely affect instru- 
ment performance. 



Some parts are manufactured or selected by Tektronix, 
Inc. to satisfy particular requirements, or are manufactured 
for Tektronix, Inc. to our specifications. Most of the me- 
chanical parts used in this instrument have been manufac- 
tured by Tektronix, Inc. To determine manufacturer of parts, 
refer to Parts List, Cross Index Mfr. Code Number to 
Manufacturer. 



When ordering replacement parts from Tektronix, Inc., 
include the following information: 

I . Instrument type. 



2. Instrument serial number. 



3. A description of the part (if electrical, include circuit 
number). 



4. Tektronix part number 



Soldering Techniques 

WARNING | 



Disconnect the instrument from the power source be- 
fore soldering. 



The reliability and accuracy of this instrument can be 
maintained only if proper soldering techniques are used 
when repairing or replacing parts. General soldering tech- 
niques that apply to maintenance of any precision electronic 
equipment should be used when working on this instrument. 
Use only 60/40 rosin-core, electronic-grade solder. The 
choice of soldering iron is determined by the repair to be 
made. When soldering on circuit boards, use a 35- to 40- 
watt pencil-type soldering iron with a 1 /8-inch wide, wedge- 
shaped tip. Keep the tip properly tinned for best heat 
transfer to the solder joint. A higher wattage soldering iron 
may separate the wiring from the base material. Avoid ex- 
cessive heat; apply only enough heat to remove the compo- 
nent or to make a good solder joint. Also, apply only enough 



REV JUN 1981 



67 





Maintenance — 7844/R7844 Service 



solder to make a firm solder joint; do not apply too much 
solder. 




Several of the circuit boards in the 7844/R7844 are 
multi-layer type boards with a conductive path lami- 
nated between the top and bottom board layers. All 
soldering on these boards should be done with ex- 
treme care to prevent breaking the connections to this 
center conductor; only experienced maintenance per- 
sonnel should attempt repair of these boards. 



For metal terminals (e.g., switch terminals, potentiom- 
eters, etc.), a higher wattage-rating soldering iron may be 
required. Match the soldering iron to the work being done. 
For example, if the component is connected to the chassis 
or other large heat-radiating surface, it will require a 75-watt 
or larger soldering iron. The pencil-type soldering iron used 
on the circLit board can be used for soldering to switch ter- 
minals, potentiometers, or metal terminals mounted in plas- 
tic holders. 



Component Removal and Replacement 



WARNING 



Disconnect the instrument from the power source be- 
fore replacing components. 



The exploded-view drawings associated with the Re- 
placeable Mechanical Parts list (Section 10) may be helpful 
in the removal or disassembly of individual components or 
sub-assemblies. Figure 9-2 in the Diagrams section shows 
the location of circuit boards within the 7844/R7844. 



Power Unit 

The power unit can be slid out of the rear of the 
7844/R7844 to gain better access to the Logic board, Beam 
2 Z-Axis board (7844 only), Low-Voltage board, or for pow- 
er-unit maintenance. To remove the power unit, first remove 
the four screws that hold the power unit to the rear frame of 
the instrument (see Fig. 6-2). Slide the power unit out of the 
rear of the instrument until it can be set down on the work 
surface (guide the power cables so they do not catch on 
other parts of the instrument). The power unit remains con- 
nected to the rest of the instrument so it can be operated in 
this position for troubleshooting purposes. If it is necessary 
to operate this instrument with the power unit removed for a 
period of time, it is recommended that the power unit be 
secured to the instrument with spacers between the rear 
frame and the power unit. Reverse this procedure when re- 



placing the power unit; be careful not to pinch the power 
cables as the power unit is replaced. Be sure that all the 
securing screws are tight to hold the power unit properly in 
place. 



WARNING 



Extreme caution must be used when troubleshooting 
in the power supply due to the line voltage and the 
high voltage/high current potentials present. Refer to 
the discussion entitled Access to Components in 
Power Unit for information on how to remove the pro- 
tective cover/shield from the power unit. 



Access to Components in Power Unit. To reach the 
components located inside the power unit for maintenance 
or repair, use the following procedure: 




1676-2 



Fig. 6-2. Power unit securing screws. 

Disconnect the instrument from the power source be- 
fore removing the power-unit cover. The primary stor- 
age capacitors , C1216 and C1217, remain charged 
with high voltage dc for several minutes after the line 
power is disconnected. A warning indicator (neon 
bulb), located on the Power Supply Inverter board, 
flashes when this stored voltage exceeds approxi- 
mately 80 volts. Do not remove the power-unit cover 
while this light is flashing. 



6-8 



REV JUN 1981 




Maintenance — 7844/R7844 Service 



1. Slide out the power unit as described previously. 



2. Disconnect the crt anode plug from the jack located at 
the front of the power unit. Ground this lead to the chassis 
to dissipate any stored charge (do not allow the anode lead 
to touch components in the instrument before it is 
discharged). 



3. Disconnect all the multi-pin connectors that connect 
the power unit to the rest of the instrument (remove the 
rear-panel Signals Out subassembly to gain access to two 
of the multi-pin connectors). 



4. Disconnect the power-unit ground lead (green-with- 
yellow stripe wire terminated with spade lug) by removing 
the screw attaching it to the chassis. 



5. Remove the screws that secure the protective cover 
to the front and bottom of the power unit and pull the cover 
off of the power unit. 



6. The power unit is now open for maintenance or repair. 
For information on circuit board removal and replacement, 
see the instructions given under Circuit Board Replacement 
for the applicable board. To replace the transformer, see 
Power Transformer Replacement in this section. 



7. Replace the power-unit cover in the reverse order of 
removal. 



Circuit Be ards 

If a circuit board is damaged beyond repair, replace the 
entire board asembly. Part numbers are given in the Re- 
placeable Electrical Parts list for completely wired boards. 



The pin connectors, except for coaxial-type connectors, 
used for interconnection between circuit boards, are color- 
coded to aid in identification and circuit tracing. The color of 
the connector body matches the resistor color-code for the 
last digit of the connector circuit number; e.g., P601 is 
brown, P603 is orange, etc. 



Most o : the circuit boards in this instrument are mounted 
on the chassis; pin connectors are used for interconnection 
with other circuit boards and components mounted off the 
boards. Several boards plug onto the front and rear of the 
Main Interface board; feed-thru connectors connect the 
plug-on boards to the Main Interface board. 



Chassis-Mounted Boards. Remove and replace chas- 
sis-mounted boards as follows. 



1 . Disconnect all pin connectors connected to the board, 
or which connect the board to other portions of the 
instrument. 



2. Remove the securing screws. 



3. Remove the board. 



4. Replace chassis-mounted boards in the reverse order 
of removal. Match the arrows on the multi-pin connectors to 
the arrows on the board. Correct location of the pin connec- 
tors is shown on the circuit board illustrations in the Dia- 
grams section. 



Plug-On Boards. Remove and replace plug-on boards as 
follows. 



1 . Remove plug-in units or slide out the power unit (see 
Power Unit Removal) as necessary to gain access to boards 
mounted on the front or rear of the main Interface board. 



2. Disconnect any coaxial end-lead connectors located 
on the front of the board, or those that pass across a por- 
tion of the board. 



3. Loosen all of the securing screws on the board. 



4. Pull out on the edges of the board until the board 
clears the feed-thru terminals. Hold the board parallel to the 
Main Interface board until the board is free, so as not to 
bend the feed-thru terminals. 



5. To replace a plug-on circuit board, position it so the 
feed-thru pins and sockets mate properly. 



6. Gently press the circuit board against the mounting 
surface. Be sure that all the feed-thru pins and sockets mate 
properly. 



7. Uniformly tighten the securing screws. Recommended 
torque is four to six inch-pounds. 



A5-Main Interface Circuit Board. Remove and replace 
the Main Interface circuit board as follows. 



REV JUN 1981 



6-9 




Maintenance — 7844/R7844 Service 



1 . Slide out the power-unit as described previously. 



2. Disconnect the pin connectors from the Main Inter- 
face board. Note the order of these connectors so they can 
be correctly replaced. 



3. Remove the screws from inside each plug-in compart- 
ment that hold the plug-in interface connectors to the chas- 
sis of this instrument. Also remove the screws that hold the 
ground straps to the chassis. 



4. Slide the Main Interface board assembly to the rear, 
and remove it from the instrument. 



5. Replace the Main Interface board in the reverse order 
of removal Match the arrows on the pin connectors to the 
arrows on the board. Correct location of the pin connectors 
is shown in the circuit board illustration in the Diagrams sec- 
tion. Also see pin connector color-code under Circuit Boards 
in this section. 



A 1 -Calibrator Board. Remove and replace the Calibra- 
tor circuit board as follows. 



1. Remove the READOUT INTENSITY knob and secur- 
ing nut. 



2. Remove the GRAT ILLUM control knob and securing 
nut. 



3. Disconnect all pin connectors from the board. 



4. Remove the screws that hold the Calibrator board to 
the spacer s. 



5. Remove the Calibrator board. 



6. To replace the Calibrator board, position the Calibra- 
tor board so the front-panel controls and switches align with 
the holes in the front panel. 



7. Replace the securing screws and front-panel knobs. 



8. Connect the pin connectors to the Calibrator board. 
Match thei arrows on the connectors to the arrows on the 
board. Correct location of the connectors is shown in the 
circuit-board illustration in the Diagrams section. 



A-25 Signals Out Board. The Signals Out board is part 
of a subassembly. Remove and replace the Signals Out 
board as follows. 



1 . Remove the screws holding the subassembly to the 
rear panel. Remove the subassembly. 



2. Disconnect the pin connectors and coaxial cables 
from the board. Note the location of the cables so they can 
be replaced correctly. 



3. To remove the board from the subassembly, use a 
vacuum-type desoldering tool to remove the solder attach- 
ing the board to the bnc connectors and ground lugs. 



4. Replace the Signals Out board in the reverse order of 
removal. Match the arrows on the connectors to the arrows 
on the board. Correct location of the pin connectors is 
shown in the circuit-board illustration in the Diagrams 
section. 



A13 and A16-Vertical Amplifier Boards. Remove and 
replace the Vertical Amplifier boards as follows. 



1 . Disconnect all pin connectors and coaxial cables from 
the board. Note the location of cables so they can be re- 
placed correctly. 



2. Remove the screws holding the board in place. 



3. Remove the board. 



4. To replace the Vertical Amplifier board, remove the 
vertical output 1C (note orientation of tab on 1C case with 
dot on metal plate) from the board. 



5. Replace the board in the instrument, but do not tight- 
en the screws at this time (on the R7844, the Vertical Ampli- 
fier board located on the right side of the crt has spring clips 
holding the bottom of the board in place). 



6. Align the two holes in the Output 1C socket pin pat- 
tern with the two pin sockets on the Vertical Connect board 
located behind the Vertical Amplifier board. (When installing 
the R7844 Vertical Amplifier board located to the right of the 
crt, use a small mirror, such as a dental mirror, to align the 
two holes in the Output 1C socket pin pattern with the two 
pin sockets on the Vertical Connect board.) Then tighten the 
securing screws. 



6-10 



REV JUN 1981 




Maintenance — 7844/R7844 Service 



7. Apply silicone grease to the base of the Output !C. 
Insert the 1C into its socket with the pin alignment tab orient- 
ed as previously noted. 



8. Reconnect multi-pin connectors. Match the arrows on 
the connectors to the arrows on the board. Reconnect the 
coaxial cables. 



A29-LV Regulator Board. Remove and replace the LV 
Regulator circuit board as follows. 



1 . Slide the power unit out of the rear of the instrument 
as described previously. 



2. Disconnect the multi-pin connectors from the board. 



3. Remove the mounting hardware securing the plastic- 
cased power transistors to the rear heatsink. Note the ori- 
entation of the lockwashers so they can be correctly 
replaced. 



4. Remove the screws that hold the LV Regulator board 
to the top chassis. Remove the board along with the plastic- 
cased transistors. 



5. To replace the LV Regulator board, apply a thin coat 
of silicone grease on the back (mounting surface) of each 
plastic transistor case. 



6. Place the LV Regulator board on the chassis. Replace 
the screws that hold the board to the chassis; do not yet 
tighten these screws. 



7. Check that the plastic transistors are aligned with 
their mounting holes and that the insulating washers are in 
place between the transistor cases and the rear heatsink. 



8. Secure the transistors to the heatsink with the mount- 
ing hardware. Do not over-tighten the nut. Recommended 
torque is 4 to 6 inch-pounds. 



9. Tighten the screws holding the LV Regulator board to 
the chassis. 



10. Connect the multi-pin connectors to the board. 
Match the arrows on the connectors to the arrows on the 
board. 



1 1 . Replace the power unit in the instrument. 



A27-Power Supply Inverter Board. To remove and re- 
place the Power Supply Inverter board, use the following 
procedures. An exploded-view drawing of the power unit is 
shown in the Replaceable Mechanical Parts list. All 
references to direction or location (e.g., left side) assume 
that the power unit is placed as shown in this drawing. Sev- 
eral critical parts are identified in Fig. 6-3, an exploded-view 
drawing of a portion of the power unit. 

~ WARNING 



The power-unit assembly has been tested at the fac- 
tory to assure safe operation. Improper repair of this 
unit can result in hazardous voltages on the chassis of 
this instrument. Do not remove the plate insulator, 
block insulator, or transistor shield from the rear heat- 
sink (see Fig. 6-3). 




Fig. 6-3. Exploded-view drawing of a portion of the power unit 
identifying several critical parts. 



1 . Disconnect the instrument from the power source. 



REV JUN 1981 



6-11 






Maintenance — 7844/R7844 Service 



2. Remove the power unit from the instrument as de- 
scribed under Power Unit. 



3. Remove the protective cover from the power unit as 
described under Access to Components in Power Unit. 



4. Disconnect the multi-pin connectors from A28, Cap- 
Rectifier board. 



5. Remove the mounting hardware securing the plastic- 
cased power transistors to the rear heatsink. Note the ori- 
entation ol the lockwashers so they can be correctly 
replaced. 



6. Remove the Regulator chassis. This chassis is se- 
cured to the rear heatsink by two screws; access to the 
remaining two screws is provided by holes in A29, LV Regu- 
lator board (note length of screws so they can be correctly 
replaced). Flemove this chassis along with the LV Regulator 
board and plastic-cased transistors. 



7. Remove the right side cover. This cover is secured to 
the rear heatsink by two screws and to the side by one 
screw. 



8. Remove the left side cover. This cover is secured to 
the rear heatsink by two screws and to the side by four 
screws. 

9. Remove the transistor shield from A27, Power Supply 
Inverter board, by removing two plastic screws. 



10. Unsolder the three power-transformer leads from 
A27, Power Supply Interter board. These leads pass 
through holes in the board. 



1 1 . The left side of A28, Cap-Rectifier board, is secured 
to the capacitor bracket by two screws. Remove these 
screws. 



12. The top right corner of A28, Cap-Rectifier board, is 
secured to the nut block by a screw. Remove this screw. 



13. The left side of A27, Power Supply Inverter board, is 
secured to two capacitors by four screws. Remove these 
screws to remove the capacitors and capacitor bracket. 



14. Remove the two screws securing the high-voltage 
supply box to the heat sink. Move the bottom edge of A28, 



Cap-Rectifier board, away from A27, Power Supply Inverter 
board, until the interconnecting pins are cleared. Remove 
A28, Cap-Rectifier board, and the high-voltage supply box 
as a unit. 



15. Unsolder the five line-input leads from A27, Power 
Supply Inverter board. 



16. The line-filter shield is held to the rear heatsink by 
two screws on the power plug. Remove these screws; it is 
not necessary to disconnect the line-filter leads. 



17. Remove the two transistors by removing the nuts 
and pulling the transistors from their sockets. 



18. The circuit board shield is held to the transistor- 
shield by three screws. Remove these screws. 



19. Move A27, Power Supply Inverter board, away from 
the transistor shield until the transistor mounting studs clear 
the transistor shield. Remove A27, Power Supply Inverter 
board, and the circuit board shield as a unit. 



20. To replace the Power Supply Inverter board, set the 
back of the rear heatsink on the work surface and guide the 
transistor mounting studs through the holes in the transistor 
shield. 



21 . Secure the circuit board shield to the insulator block 
with three screws. 



22. Apply a thin coat of silicone grease to both sides of 
the transistor insulating washers and place these washers 
over the transistor mounting studs. 

23. Replace the transistors and secure with nuts. 



24. Secure the line-filter power plug to the rear heat-sink 
with the two screws. Be sure no wires get caught between 
the shield and heatsink. 

25. To mount A28, Cap-Rectifier board, and high-volt- 
age supply box, guide the power-transformer leads through 
the appropriate holes in A27, Power Supply Inverter board. 
Then, align A28, Cap-Rectifier board, to properly mate the 
interconnecting pins and sockets. 

26. Replace the screw that secures A28, Cap-Rectifier 
board, to the nut block. Replace the two screws to secure 
the high-voltage box to the heatsink. 



6-12 



REV JUN 1981 




Maintenance — 7844/R7844 Service 



27. Place the power-unit ground lead and power-switch 
cable in the slot in the top of A28, Cap-Rectifier board. 



28. Mount the capacitors with the capacitor bracket to 
A27, Power Supply Inverter board, with four screws. 



29. Replace the two screws that secure A28 Cap-Recti- 
fier board, to the capacitor bracket. 



30. Solder the three power-transformer leads and four 
line-input leads to A27, Power Supply Inverter board. 



31 . Replace the transistor shield; secure with two plastic 
screws. 



32. Replace the left side cover; secure with three 
screws. 



33. Replace the right side cover; secure with six screws. 



34. Before replacing the Regulator board chassis along 
with A29, LV Regulator board, and plastic power transis- 
tors, apply a thin coat of silicone grease to the back (mount- 
ing surface) of each transistor case. Check that the 
transistor insulating washers are in place on the rear 
heatsink. If any of these insulating washers are replaced, 
apply a thin coat of silicone grease to each side. 



35. Place the Regulator board chassis on the power 
unit. Check that the plastic transistors are aligned with their 
mounting holes and that the insulating washers are still in 
place between the transistor cases and the rear heatsink. 



36. Replace the screws that secure the Regulator board 
chassis; do not yet tighten these screws. 



37. Secure the plastic transistors to the rear heatsink 
with the mounting hardware. Do not over-tighten these 
nuts. Recommended torque is 4 to 6 inch-pounds. Tighten 
the screws replaced in the previous step. 



38. Connect the multi-pin connectors to A28, Cap-Recti- 
fier board; match the arrows on the connectors to the ar- 
rows on the board. 



39. Replace the power-unit cover and install the power 
unit in the mainframe. 



A28-Cap-Rectifier Board. Remove and replace the Cap- 
Rectifier circuit board as follows. 



1 . Follow the first 1 2 steps of the removal procedure for 
the Power Supply Inverter board. 



2. Unsolder the power-transformer leads connected to 
the rear side of the board. Remove the excess solder with a 
vacuum-type desoldering tool. 



3. Remove the screws that hold the circuit board to the 
high-voltage supply box. 



4. Replace the Cap-Rectifier board in the reverse order 
of removal. Place all of the power-transformer leads in the 
circuit board holes; then re-solder them to the board. To 
replace the Regulator board chassis along with the LV Reg- 
ulator board and plastic power transistors, see the instruc- 
tions given in the replacement procedure for the Power 
Supply Inverter board. 



A24-High-Voltage Board. The High-Voltage circuit 
board is located in the high-voltage supply box and is re- 
moved as a unit. Remove and replace this board as follows. 



1 . Follow the first 6 steps given under Access to Compo- 
nents in Power Unit. 



2. Disconnect the remaining multi-pin connectors from 
the LV Regulator board. 



3. Remove the hardware that secures the plastic power 
transistors to the rear heatsink. 



4. Remove the two screws that hold the Regulator chas- 
sis to the power unit (accessible through holes in the LV 
Regulator board). 



5. Remove the two screws securing the lip of the Regu- 
lator chassis to the rear heatsink. 



6. Remove the Regulator chassis along with the LV 
Regulator board and plastic transistors. 



7. Remove the screw securing the High-Voltage board 
to the high-voltage supply box. 



REV JUN 1981 



6-13 




Maintenance — 7844/R7844 Service 



8. Unsolder the five power-transformer leads connected 
to the High-Voltage board. Note the location of these leads 
so they can be correctly re-connected. Remove the excess 
solder from the board with a vacuum-type desoldering tool. 



9. Remove the High-Voltage board from the high-voltage 
supply box. 



1 0. Replace the High-Voltage board in the reverse order 
of removal. To replace the Regulator chassis along with the 
LV Regulator board and plastic transistors, see the instruc- 
tions given in the replacement procedure for the Power Sup- 
ply Inverter board. 



A3-Crossover Mode Switch Board. Remove and re- 
place the Crossover Mode switch board as follows. 



1. Remove the VERT SEP (1) and HORIZ SEP (1) 
knobs. 



2. Remove the five screws that hold the board to the 
chassis (access to the screws is through the plug-in 
compartments). 



3. Move the board toward the rear of the instrument un- 
til it clears the chassis (front-panel push buttons remain with 
the board). 



4. Remove the board from the instrument and discon- 
nect the multi-pin connectors. 



5. Replace the board in the reverse order of removal. 
Match the arrows on the multi-pin connectors to the arrows 
on the board. Correct location of pin connectors is shown 
on the circuit board illustration in the Diagrams section. 



Plug-In Interface Connectors 

The individual contacts of the plug-in interface connec- 
tors can be replaced. However, it is recommended that the 
entire Main Interface board be replaced if a large number of 
the contacts are damaged. An alternative solution is to refer 
the maintenance of the damaged Main Interface board to 
your local Tektronix Field Office or representative. Use the 
following procedure to remove and replace an individual 
contact of the plug-in interface connector. 



NOTE 

The plug-in interface contacts mounted on the Follow- 
er circuit boards cannot be replaced individually; the 
Follower board with contacts and interconnecting ca- 
bles is replaced as a unit. See Follower Circuit Board. 



1 . Remove the Main Interface circuit board from the in- 
strument as described previously. 



2. Snap the connector cover (white plastic) off the side 
of the plug-in interface connector that needs repair. 



3. Unsolder and remove the damaged contact. 



4. Install the replacement contact. Carefully form it to 
the required shape to fit against the connector body. 



5. Snap the connector cover back onto the plug-in inter- 
face connector. Check that the contact that was replaced is 
aligned with the other contacts. 



6. Replace the Main Interface board. 



Follower Circuit Board 

A Follower circuit board with six interface contacts is 
used in each vertical (two left plug-in compartments) plug-in 
interface to provide optimum signal and trigger connections 
between the plug-in unit and the 7844/R7844. The Follower 
board is held in place by a follower spring so the board can 
move back and forth within the interface connector to com- 
pensate for length differences between plug-ins. If a contact 
on the Follower board is damaged, the entire board with 
contacts and interconnecting cables is replaced as a unit. 



Remove a Follower circuit board as follows: 

1 . Disconnect the Follower board coaxial leads from the 
Vertical Interface board and Trigger Selector board. 



2. Using long-nosed pliers, disengage the follower spring 
from the Follower board (a hole in the Main Interface board 
provides access to the follower spring from the rear of the 
board). Push the follower spring away from the Follower 
board toward the top of the interface connector. 



3. Remove the Follower board and interconnecting ca- 
bles from the rear of the interface connector through the 
hole in the Main Interface board. 



6-14 



REV JUN 1981 




Maintenance — 7844/R7844 Service 



To replace a Follower board, a folded length of thin shim 
stock as wide as the Follower board is required to compress 
the contacts while the board is inserted into the interface 
connector. Proceed as follows: 

1 . Hold the Follower board between the ends of the shim 
stock with the fold directly in front of the contacts. With the 
shim stock held against the sides of the board, the contacts 
on the sides of the board should be pressed together. 



2. Insert the folded end of the shim stock (with the Fol- 
lower board) into the rear of the intrface connector through 
the hole in the Main Interface board. When the Follower 
board contacts are fully inserted into the connector, hold the 
board in place and remove the shim stock through the front 
of the interface connector. 



3. Secure the Follower board with the follower spring. 



4. Reconnect the Follower board coaxial leads to the 
Vertical Interface board and Trigger Selector board. 



Semiconductors 

Semiconductors should not be replaced unless actually 
defective. If removed from their sockets during routing main- 
tenance, return them to their original sockets. Unnecessary 
replacement of semiconductors may affect the calibration of 
this instrument. When semiconductors are replaced, check 
the operation of the part of the instrument that may be 
affected. 




The POWER switch must be turned off before remov- 
ing or replacing semiconductors. 



Replacement semiconductors should be of the original 
type or a direct replacement. Figure 9-1 shows the lead con- 
figuration of the semiconductors used in this instru- 
ment.Some plastic case transistors have lead 
configurations that do not agree with those shown here. If a 
replacement transistor is made by a different manufacturer 
than the original, check the manufacturer’s basing diagram 
for correct basing. All transistor sockets in this instrument 
are wired for the standard basing used for metal-case tran- 
sistors. Transistors with heat radiators, or that are mounted 
on the chassis, use silicone grease to increase heat transfer. 
Replace the silicone grease when replacing these 
transistors. 



WABWIWG~| 



Handle silicone grease with care. Avoid getting sili- 
cone grease in the eyes. Wash hands thoroughly after 
use. 



An extracting tool should be used to remove the 1 4- and 
16-pin integrated circuits to prevent damage to the pins. 
This tool is available from Tektronix, Inc. Order Tektronix 
Part No. 003-0619-00. If an extracting tool is not available 
when removing one of these integrated circuits, pull slowly 
and evenly on both ends of the device. Try to avoid having 
one end of the integrated circuit disengage from the socket 
before the other, as the pins may be damaged. 



To replace one of the power transistors mounted on the 
heat radiator on the rear of the power unit, first remove the 
mounting screw. Then, unsolder and remove the defective 
transistor. When replacing the transistor, be sure to install 
the insulating washer between the transistor and the heat 
radiator (use silicone grease as described previously). Tight- 
en the mounting screw just tight enough to hold the transis- 
tor in place. Then solder the replacement transistor to the 
Regulator board. 



Interconnecting Pins 

Two methods of interconnection are used in this instru- 
ment to connect the circuit boards with other boards and 
components. When the interconnection is made with a co- 
axial cable, a special end-lead connector plugs into a socket 
on the board. Other interconnections are made with a pin 
soldered into the board. Two types of mating connectors 
are used for these interconnecting pins. If the mating con- 
nector is mounted on a plug-on circuit board, a special sock- 
et is soldered into the board. If the mating connector is on 
the end of a lead, an end-lead pin connector is used which 
mates with the interconnecting pin. The following infor- 
mation provides the removal and replacement procedure for 
the various types of interconnecting methods. 



Coaxial-Type End-Lead Connectors. Replacement of 
the coaxial-type end-lead connectors requires special tools 
and techniques; only experienced maintenance personnel 
should attempt to remove and replace these connectors. It 
is recommended that the cable or wiring harness be re- 
placed as a unit. For cable or wiring harness part numbers, 
see the Replaceable Mechanical Parts list. An alternative 
solution is to refer the replacement of the defective connec- 
tor to your local Tektronix Field Office or representative. 



Circuit-Board Pins. A circuit-board pin replacement kit 
including necessary tools, instructions, and replacement 
pins is available from Tektronix, Inc. Order Tektronix Part 



REV JUN 1981 



6-15 






Maintenance — 7844/R7844 Service 



No. 040-0542-01. Replacement of circuit-board pins on 
multi-layer boards is not recommended; refer such repairs 
to your local Tektronix Field Office or representative. 



To replace a pin mounted on a circuit board, first discon- 
nect any pin connectors. Then, unsolder the damaged pin 
and pull it out of the circuit board with a pair of pliers. Be 
careful not to damage the wiring on the board with too much 
heat. Ream out the hole in the circuit board with a 0.031- 
inch drill (on boards other than multi-layer). Remove the fer- 
rule from the new interconnecting pin and press the new pin 
into the hole in the circuit board. Position the pin in the same 
manner as the old pin. Then, solder the pin on both sides of 
the circuit board. If the old pin was bent at an angle to mate 
with a connector, bend the new pin to match the associated 
pins. 



Circuit Board Pin Sockets. The pin sockets on the cir- 
cuit boards are soldered to the rear of the board. To remove 
and replace one of these sockets, first unsolder the pin (use 
a vacuum-type desoldering tool to remove excess solder). 
Then straighten the tabs on the socket and remove it from 
the hole in the board. Place the new socket in the circuit 
board hole and press the tabs down against the board. Sol- 
der the tabs of the socket to the circuit board; be careful not 
to get solder into the socket. 



NOTE 

The spring tension of the pin sockets ensures a good 
connection between the circuit board and the pin. This 
spring tension can be destroyed by using the pin 
sockets as a connecting point for spring-loaded probe 
tips, alligator dips, etc. 



End-Lead Pin Connectors. The pin connectors used to 
connect the wires to the interconnecting pins are clamped to 
the ends of the associted leads. To remove and replace 
damaged end-lead pin connectors, remove the old pin con- 
nector from the end of the lead and clamp the replacement 
connector to the lead. 



Some of the pin connectors are grouped together and 
mounted in a plastic holder; the overall result is that these 
connectors are removed and installed as a multi-pin connec- 
tor. To provide correct orientation of this multipin connector 
when it is replaced, an arrow is stamped on the circuit board 
and a matching arrow is molded into the plastic housing of 
the multi-pin connector. Be sure these arrows are aligned as 
the multi-pin connector is replaced. If the individual end-lead 
pin connectors are removed from the plastic holder, note the 
color of the individual wires for replacement. 



Cathode-Ray Tube. Remove and replace the cathode- 
ray tube as follows. 



WARNING 



The crt may retain a dangerous electrical charge. Be- 
fore removing the crt, the anode must be fully dis- 
charged by shorting the anode lead from the crt to the 
chassis. Wait approximately ten minutes and again 
firmly short this lead to the chassis. Then remove the 
crt. After removal, short the anode lead to the silvered 
patch on the funnel poriton of the crt just prior to fur- 
ther handling. 

Use care when handling a crt. Protective clothing and 
safety glasses should be worn. Avoid striking it on any 
object that might cause it to crack or implode. When 
storing a crt, place it in a protective carton or set it 
face down in a protected location on a smooth surface 
with a soft mat under the faceplace to protect it from 
scratches. 



1. Remove the crt mask, light filter, metal light shield, 
and implosion shield. 



2. Remove the four screws securing the crt bezel to the 
front panel. Disconnect the multi-pin connector from the left 
rear of the crt bezel. 



3. Release the crt anode lead from the plastic fasteners 
near the top of the instrument. Disconnect the anode plug 
from the jack on the power unit. Ground this lead to the 
chassis to dissipate any stored charge. 



4. Disconnect the pin connectors on the top of the crt. 
Be careful not to bend the pins. 



5. Remove A13 and A16, Vertical Amplifier boards, as 
previously described. 



6. Disconnect the eight vertical deflection leads from the 
crt (four on each side of the crt). 



7. Remove the Signals Out assembly as previously 
described. 



8. Loosen the four screws located around the crt base 
socket. 



6-16 



REV JUN 1981 





Maintenance — 7844/R7844 Service 



9. Hold one hand on the crt faceplate and push forward 
on the crt base with the other. As the crt starts out of the 
shield, grasp it firmly. Guide the anode lead through the 
cutout in the crt shield as the crt is removed. 



10. To replace the crt, insert it into the shield. Guide the 
anode lead through the hole in the crt shield. Set the crt 
firmly against the cushions mounted on each corner of the 
faceplate. 



1 1 . Clean the crt faceplate, plastic implosion shield, and 
the light filter with denatured alcohol. 



12. Place the black crt mask over the crt faceplate. 



13. Reconnect the multi-pin connector to the crt bezel 
(align the arrow on the connector with the arrow on the 
bezel). Hold the implosion shield in position and install the 
crt bezel. Firmly tighten the four screws. 



1 4. Push forward on the crt base to be certain that the 
crt is as far forward as possible. Then tighten the screws on 
the crt base bracket. 



15. Replace the crt base socket. 



16. Replace the Signals Out subassembly as previously 
described. 



17. Fasten the crt anode lead into the plastic fasteners. 
Reconnect the crt anode plug. 



18. Carefully reconnect the pin connectors on top of the 
crt. After each connector is installed, lightly pull on its lead 
to be sure that it will remain in place. 



19. Reconnect the eight vertical deflection leads to the 
crt (four on each side of the crt). 



20. Replace A13 and A16, Vertical Amplifier boards, as 
described previously. 



21. Replace the metal light shield and the tinted filter. 
Then snap the plastic crt mask into the crt bezel. 



22. Replace the label (located on the top of the crt 
shield) with the label supplied with the replacement crt. 



Push Button Switches 

The push button switches used on the 7844/R7844 are 
circuit board mounted. Remove the associated circuit board 
and replace the switch. Use soldering techniques described 
previously and those techniques discussed under Circuit- 
Board Pins that are applicable to switch removal and 
replacement. 



7844 Power Light 

Remove and replace the 7844 power light as follows: 

1 . Remove the Calibrator board as previously described. 



2. Remove the retaining clip on the rear of the light 
assembly. 



3. Guide the light assembly and connecting wires out the 
front of the 7844 power light. 



4. Unsolder the connecting wires from the light assem- 
bly, using soldering techniques described previously. 



5. Solder the connecting wires to the replacement light 
assembly. 



6. Guide the connecting wires and light assembly into 
the front-panel hole and hold it in place while installing the 
retaining clip to the rear of the light assembly. 



7. Replace the Calibrator board as previously described. 

R7844 Power Light 

Remove and replace the R7844 power light as follows: 

1 . Remove the Calibrator board as previously described. 



2. Unsolder the light bulb and replace it using soldering 
techniques described previously. 



3. Replace the Calibrator board as described previously. 



Graticule Bulbs 

To remove and replace the graticule bulbs, first remove 
the plastic crt mask, light filter, and metal light shield. Pull on 
the white tabs to remove the graticule lamp assembly. Now, 
slide the lamp retaining strips to the side, off the bulb base. 
Pull the bulb out of the circuit board. Reverse the order of 
removal for replacement. 



REV JUN 1981 



6-17 




Maintenance — 7844/R7844 Service 



Power Transformer 

Replace the power transformer only with a direct re- 
placement Tektronix transformer. Remove and replace the 
power transformer as follows: 

1. Remove the Power Supply Inverter board assembly, 
Cap-Rectifier, and High-Voltage boards as given under Cir- 
cuit Boards. 



2. Remove the bracket that holds the transformer 
windings and core in place. 



3. Replace the power transformer in the reverse order of 
removal. 



Fuse Replacement 

The fuses used in this instrument are listed in Table 6-2. 



Table 6-2 

FUSE INFORMATION 



Circuit 

Number 


Rating 


Function 


Location 


FI 200 


4A Fast 


Line Input 


Rear Panel 


FI 700 


0.25A 

Fast 


Circuit 

Protection 


A 13-Beam 1 
Vertical Amplifier 
Circuit Board 


F2700 


0.25A 

Fast 


Circuit 

Protection 


A1 6-Beam 2 
Vertical Amplifier 
Circuit Board 



Recalibration After Repair 

After any electrical component has been replaced, the 
calibration of that particular circuit should be checked, as 
well as the calibration of other closely related circuits. Since 
the low-voltage supplies affect all circuits, calibration of the 
entire instrument should be checked if work has been done 
in the low-voltage supplies or if the power transformer has 
been replaced. See Section 5 for a complete calibration 
procedure. 



Geometry Presets 

The voltages for the geometry adjustments are given on 
the crt data label for each individual crt to facilitate 
recalibration after repair or replacement of the CRT board, 
Beam 1 and Beam 2 Horizontal boards, or the crt. 



Preset the geometry adjustments to the voltages given 
on the crt data label (located on the top of the crt shield). 
Check that the serial numnber on the crt data label corre- 
sponds with the crt serial number (located near the horizon- 
tal deflection leads on the neck of the crt). 



Connect a dc precision voltmeter between chassis 
ground and the test point associated with the adjustment to 
be made (see Table 6-3). For access to test points on 
P2493, remove the 4 screws that secure the rear-panel con- 
nector assembly to the rear panel. Without disconnecting 
cables, pull the assembly away from the rear panel. Replace 
the assembly after adjustments are made. 



WARNING j 

Extreme caution must be used when checking geome- 
try preset voltages due to the high voltage and high 
current potentials present. 



6-18 



REV JUN 1981 





Maintenance — 7844/R7844 Service 



Table 6-3 

CATHODE-RAY TUBE VOLTAGE PRESETS 



Adjustment 


Adjustment 

Circuit 

Number 


Diagram 

Number 


Test Point 


Test Point 
Electrical 
Location 


Test Point & 
Adjustment 
Physical 
Location 


GEOM A 
(BEAM 1) 


R1985 

(R5985) 


12 


BEAM 1 
GEOM A 


R1983 


See Fig. 9-33 


GEOM A 
(BEAM 2) 


R2985 

(R4985) 


13 


BEAM 2 
GEOM A 


R2983 


See Fig. 9-34 


GEOM B 
(BEAM 1) 


R1976 

(R5976) 


12 


BEAM 1 
GEOM B 


R1977 


See Fig. 9-33 


GEOM B 
(BEAM 2) 


R2976 

(R4976) 


13 


BEAM 2 
GEOM B 


R2977 


See Fig. 9-34 


GEOM 1 


R2560 


15 


GEOM 1 


P2493 
Pin 2 


See Fig. 9-31 


GEOM 2 


R2564 


15 


GEOM 2 


P2493 
Pin 7 


See Fig. 9-31 


BOWING 1 


R2568 


15 


BOWING 1 


P2493 
Pin 1 


See Fig. 9-31 


BOWING 2 


R2572 


15 


BOWING 2 


P2493 
Pin 8 


See Fig. 9-31 



Note: Adjustment Circuit Numbers in parentheses are for instruments 7844 SN B1 10000-above; R7844 SN BlOOOOO-above. 



Vertical Input Compensation Adjustments 

For SN B050246-up (7844) and Sn B040 139-up 
(R7844) only. Perform the following input compensation 
procedure when integrated circuits are replaced on the 
Crossover Vertical Interface, the Beam 1 Vertical Amplifier, 
or Beam 2 Vertical Amplifier boards (diagrams 7, 9, and 10, 
respectively). 



Set the controls as follows: 



POWER switch 
B TRIG SOURCE 
BEAM 1 

BEAMFINDER 
VERTICAL MODE 
HORIZONTAL MODE 
BEAM 2 

BEAMFINDER 
VERTICAL MODE 
HORIZONTAL MODE 



On 

RIGHT 

Push button out 

RIGHT 

B 

Push button out 

RIGHT 

B 



Adjust Vertical Input Compensation (R3720, C3720, 
R3620, R3665, C3665, R3765, and C3765) 

1. Install the Calibration Fixture Signal Standardizer in 
the RIGHT VERT compartment and the time-base unit in the 
B HORIZ compartment. 



2. Set the calibration fixture Test Vert or Horiz mode 
switch to + Step Resp and the Rep Rate switch to 1 MHz. 
Set the Amplitude control for a six-division display. 



3. Set the time-base unit sweep rate for 5 ns/division 
and triggering to auto mode with ac coupling from the inter- 
nal source. 



4. Set the BEAM 2 INTENSITY control fully counter- 
clockwise and the BEAM 1 INTENSITY control for a desir- 
able display. Adjust the time-base unit triggering level for a 
stable display. 



REV JUN 1981 



6-19 



Maintenance — 7844/R7844 Service 



5. Position the leading front corner of the displayed 
pulse to graticule center. 



6. ADJUST — Right Beam 1 Input Comp adjustments 
R3720 and C3720 for minimum aberrations (disregard the 
first 0.1 division of the displayed pulse). Refer to Fig. 9-38 
on Adjustment Locations 5 pullout page. 



7. Move the Calibration Fixture Signal Standardizer to 
the LEFT VERT compartment. 



8. Set the BEAM 1 and BEAM 2 VERTICAL MODE 
switches to LEFT and the B TRIG SOURCE switch to LEFT. 



NOTE 

It is important that the displayed pulses in parts 6 and 
9 are adjusted as nearly identical as possible. 



9. ADJUST — Left Beam 1 input Comp adjustments 
R3620 and C3620 for minimum aberrations (disregard the 
first 0.1 division of the displayed pulse). Refer to Fig. 9-38 
on Adjustment Locations 5 pullout page. 



10. Set the BEAM 1 INTENSITY control fully counter- 
clockwise and the BEAM 2 INTENSITY control for a desir- 
able display. 



11. ADJUST — Left Beam 2 Input Comp adjustments 
R3665 and C3665 for minimum aberrations (disregard the 
first 0.1 division of the displayed pulse). Refer to Fig. 9-38 
on Adjustment Locations 5 pullout page. 



NOTE 

It is important that the displayed pulses in parts 1 1 
and 14 are adjusted as nearly identical as possible. 



12. Move the Calibration Fixture Signal Standardizer to 
the RIGHT VERT compartment. 



13. Set the BEAM 1 and BEAM 2 VERTICAL MODE 
switches to RIGHT. Set the B TRIG SOURCE switch to 
RIGHT. 



14. ADJUST— Right Beam 2 Input Comp adjustments 
R3765 and C3765 for minimm aberrations (disregard the 
first 0.1 division of the displayed pulse). Refer to Fig. 9-38 
on Adjustment Locations 5 pullout page. 



15. Refer to the Peformance Check/Calibration section 
and complete the Vertical System procedure (section F). 



Instrument Repackaging 

If the Tektronix instrument is to be shipped to a 
Tektronix Service Center for service or repair, attach a tag 
showing: owner (with address) and the name of an individ- 
ual at your firm that can be contacted, complete instrument 
serial number, and a description of the service required. 



Save and re-use the package in which your instrument 
was shipped. If the original packaging is unfit for use or not 
available, repackage the instrument as follows: 

1 . Obtain a carton of corrugated cardboard having inside 
dimensions of no less than six inches more than the instru- 
ment dimensions: this will allow for cushioning. Refer to Ta- 
ble 6-4 for carton test strength requirements. 



2. Surround the instrument with polyethylene sheeting to 
protect the finish of the instrument. 



3. Cushion the instrument on all sides by tightly packing 
dunnage or urethane foam between the carton and instru- 
ment, allowing three inches on all sides. 



4. Seal the carton with shipping tape or industrial 
stapler. 



Table 6-4 

SHIPPING CARTON TEST STRENGTH 



Gross Weight (lb) 


Carton Test Strength (lb) 


0-10 


200 


10-30 


275 


30-120 


375 


120-140 


500 


140-160 


600 



6-20 



REV JUN 1981 




Section 7 — 7844/R7844 Service 



INSTRUMENT OPTIONS 



Your instrument may be equipped with one or more in- 
strument options. A brief description of each option is given 
in the following discussion. Option information is incorporat- 
ed into the appropriate sections of the manual. Refer to Ta- 
ble 7-1 and the Table of Contents for location of option 
information. 



Conversion kits, for most options, are available and can 
be installed at a later time. For further information on instru- 
ment options, see your Tektronix Catalog or contract your 
Tektronix Field Office. 



OPTION 03 

This option provides electromagnetic shielding so that 
the instrument will meet the emi (electromagnetic interfer- 
ence) parameters given in the Specification section of this 
manual. To meet emi specifications of instruments equipped 
with Option 03, all unused plug-in compartments must be 
covered with an emi-shielded blank plug-in panel (Tektronix 
Part No. 016-0155-00). One blank panel is required for each 
unused plug-in compartment. 



OPTION 21 

This option eliminates the VERTICAL MODE switch, 
thereby dedicating the LEFT VERT plug-in compartment to 
beam 1 and the RIGHT VERT plug-in compartment to beam 
2. The VERT SET (1) control is also eliminated. 



OPTION 22 

This option provides an oscilloscope enhancer to effec- 
tively increase the writing rate for single-shot photographs. 
Photographic writing speed is increased by providing raster 
scanning of the crt at the end of beam 2 sweep. Option 22 is 
recommended when a camera equipped with a writing 
speed enhancer is not available. 



OPTION 78 

Option 78 allows selection of P11 cathode-ray tube 
phosphor. Cathode-ray tubes with P11 phosphor provide 
maximum photographic writing speed for the 7844/R7844. 



Table 7-1 

OPTION INFORMATION LOCATOR 



Instrument Option 


Manual Section 


Location of Information 




1 


Environmental 




Specification 


Table 1-5 includes electromagnetic interference 
characteristics. 


Option 03 


2 


Installation of Plug-in units 


(Provides emi shielding) 


Operating 

Information 


Emi information included in installation. 




7 


Instrument Options 




Instrument 

Options 


Introductory page includes a brief description of the emi 
option. 




10 


Instrument Options (pull-out page) 




Replaceable 

Mechanical 

Parts 


Provides a mechanical parts list and an exploded-view 
drawing unique to the emi option. 



REV JUN 1981 



7-1 




Instrument Options — 7844/R7844 Service 



Table 7-1 (cont) 



Instrument Option 


Manual Section 


Location of Information 




1 


Electrical 




Specification 


Vertical specifications in Table 1-1 include 
characteristics unique to Option 21 . 




2 


Features 




Operating 

Information 


Includes Option 21 features. 

Controls and Connectors 

Figure 2-1 includes controls and connectors information 
unique to Option 21 . 




3 


Dedicated Mode Switch 




Theory 


Describes operation of the Dedicated Mode Switch 




of 

Operation 


shown on diagram 3. 

Dedicated Vertical Interface 

Describes operation of the Dedicated Vertical Interface 
circuits shown on diagram 8. 




4 


Using This Procedure 




Performance 


Includes instructions for calibrating instruments equipped 




Check 


with Option 21 . 




5 


F. Vertical System 




Adjustment 

Procedure 


1 . Adjust Beam 1 Vertical Centering. 

Omit parts containing the notation “delete with Option 
21”. 

2. Adjust Beam 2 Vertical Centering 

Omit parts containing the notation “delete with Option 
21”. 

3. Adjust Beam 1 and Beam 2 Vertical Amplifier Gain. 

Step 3 applies only to instruments equipped with 
Option 21 . 

4. Adjust Beam 1 and Beam 2 Vertical Crossover Gain. 

Omit step 4 for instruments equipped with Option 21 . 

9. Check Beam 1 and Beam 2 Vertical Crossover 
aberrations. 

Omit step 9 for instruments equipped with Option 21 . 



7-2 



REV JUN 1981 






Instrument Options — 7844/R7844 Service 



Table 7-1 (cont) 



Instrument Option 


Manual Section 


Location of Information 


Option 21 


7 


Instrument Options 


(Dedicated Vertical 
System) 


Instrument 

Options 


Introductory page contains a description of the 
Dedicated Vertical system (Option 21). 




8 

Replaceable 

Electrical 

Parts 


Replaceable parts unique to Option 21 contain the footnote 
“Option 21 only”. 




9 


Dedicated Mode Switch 




Diagrams 

and 

Circuit Board 
Illustrations 


All circuitry on diagram 3 is unique to Option 21 . 

Dedicated Vertical Interface <(8^> 

All circuitry on diagram 8 is unique to Option 21. 




10 

Replaceable 

Mechanical 

Parts 


Instrument Options (pull-out page) 

Provides a mechanical parts list and an exploded-view 
drawing unique to Option 21 . 




1 


Electrical 




Specification 


Display specifications in Table 1-1 include photographic 
writing speed characteristics for Option 22. 




3 


Enhancer 




Theory of 
Operation 


Describes operation of the writing speed enhancer 
circuitry shown on diagram 20. 




7 


A description of the Writing Speed Enhancer, Operating 




Instrument 

Options 


Information, and Performance Check/Adjustment Procedure 
information is contained in this section. 


Option 22 


8 


Replaceable parts unique to Option 22 contain the footnote 


(Writing Speed 
Enhancer) 


Replaceable 

Electrical 

Parts 


“Option 22 only”. 




9 


Enhancer 




Diagrams and 
Circuit Board 
Illustrations 


All circuitry unique to Option 22 is shown on diagram 20. 




10 


Instrument Options (pull-out page) 




Replaceable 

Mechanical 

Parts 


Provides a mechanical parts list and an exploded-view 
drawing unique to the writing speed enhancer. 




1 


Electrical 




Specification 


Display specifications in Table 1-1 include photographic 
writing speed characeristics for instruments that have 
cathode-ray tubes with P1 1 phosphor. 



7 3 



REV JUN 1981 





Instrument Options — 7844/R7844 Service 



Table 7-1 (cont) 



Instrument Option 


Manual Section 


Location of Information 


Option 78 


7 


Instrument Options 


(P11 cathode-ray 
tube phosphor) 


Instrument 

Options 


The introductory page includes a description of the 
cathode-ray tube phosphor option. 




8 

Replaceable 

Electrical 

Parts 


Provides the replacement part number for a cathode-ray tube 
with P1 1 phosphor. 



OPTION 22 OPERATING INFORMATION 



Introduction 

This option provides an oscilloscope enhance to effec- 
tively increase the writing rate for single-shot photographs. 
Photographic writing speed is increased by providing raster 
scanning of the crt at the end of beam 2 sweep. Option 22 is 
recommended when a camera equipped with a writing 
speed enhancer is not available. 



Controls and Connectors 

The major controls required for the operation of the 
7844/R7844 Option 22 (Writing Speed Enhancer) are locat- 
ed on the front panel of the instrument. However, the 
Readout Mode Switch is located on the Readout circuit 
board inside the instrument. A brief description of the con- 
trols unique to Option 22 follow. 



READOUT INTENSITY/PULSED ENHANCER (PULSED 
Mode) 

Varies the brightness of the readout display. In the coun- 
terclockwise detent (OFF), the pulsed readout and enhancer 
functions are inoperative. In the clockwise detent, the 
readout system and the enhancer system are in the 
PULSED mode. The READOUT PRESET, ENHANCER 
PRESET, EXTERNAL or BEAM 2 GATED, and MANUAL 
functions are actived in the PULSED mode. 



READOUT INTENSITY/PULSED ENHANCER EXTERNAL 
or BEAM 2 GATED Switch (PULSED Mode) 

In the BEAM 2 GATED mode (push button out), one ras- 
ter scan display is provided for single sweep enhancement 
and one readout frame is displayed at the end of beam 2 
sweep. When in the EXTERNAL mode (push button in), an 
input (ground closure) to the rear-panel GRAT/READOUT 



SINGLE SHOT connector provides one raster scan and one 
display of readout signal. 

READOUT AND ENHANCER MANUAL Switch (PULSED 
Mode) 

Displays one raster scan and one readout frame when 
the MANUAL push button is pressed. 



READOUT PRESET Adjustment (PULSED Mode) 

Controls brightness of readout portion of the crt display, 
when operating in the PULSED mode. 



ENHANCER PRESET Adjustment (PULSED Mode) 

Varies the brightness of the raster scan display for single 
sweep enhancement. 

Readout Mode Switch (Internal) 

The two-position Readout Mode switch determines 
whether the readout display mode is dependent on the 
front-panel controls (Free-Run mode) or is in the Gated 
mode (see Fig. 7-1). In the Free-Run mode (marked F.R. on 
the circuit board) the readout display is dependent on the 
setting of the front-panel READOUT controls. When the in- 
ternal switch is set for Gated operation (not marked on the 
circuit board) readout is displayed at the end of beam 2 
sweep, independent of front-panel READOUT control 
settings. The internal switch is only recommended for use 
with single-sweep photography when raster scanning is not 
desired. For further information, see the following Display 
Photography discussion. 



DISPLAY PHOTOGRAPHY 

The 7844/R7844 Option 22 increases the photographic 
writing speed for single-sweep photography of fast transient 



7-4 



REV JUN 1981 




Instrument Options — 7844/R7844 Service 



signals. To use the writing speed enhancer, set the 
READOUT INTENSITY/PULSED ENHANCER control to the 
PULSED detent. Set the ENHANCER PRESET by experi- 
menting with the waveform photograph. When the 
ENHANCER PRESET level is low (counterclockwise), the 
photograph background will appear black and the fast-rising 
portions of the waveform may not develop. As the 
ENHANCER PRESET level is increased (in a clockwise di- 
rection), the photograph background will approach grey and 
the additional light supplied by raster scanning should 
produce a visible image on the fast-rising portions of the 
photograph. However, it the ENHANCER PRESET level is 
set too high, the background exposure approaches the 
trace exposure, which makes the photograph unusable. 



If the photographic application does not require enhance- 
ment and pulsed readout operation is desired, the 
ENHANCER PRESET control can be set counterclockwise 
to eliminate the raster scan display. Another method to 
produce pulsed readout without the raster scan display, is 
to set the front-panel READOUT INTENSITY/PULSED 
ENHANCER control out of switch detent (non-pulsed oper- 
ation) and set the internal Readout Mode Switch to Beam 2 
Gated; however, the instrument cover must be removed to 
gain access to the switch. The internal Beam 2 Gated 
switch must be set to F.R. (Free Run) for normal operation 
of front-panel READOUT controls. See Fig. 7-1 for Readout 
Mode Switch location. 



OPTION 22 PERFORMANCE 
CHECK/ADJUSTMENT PROCEDURE 

Equipment Required 

Time-base unit 
Three-inch screwdriver 

Control Settings 

Set the 7844/R7844 front-panel controls as follows: 



POWER switch ON 



READOUT INTENSITY/ PULSED (fully 

PULSED ENHANCER clockwise) 



EXTERNAL or BEAM 2 BEAM 2 GATED 
GATED (push button 

OUT) 



BEAM 1 

HORIZONTAL MODE A 



BEAM 2 

HORIZONTAL MODE 
INTENSITY 
BEAMFINDER 
(LOCKS IN) 



B 

Midrange 
Push button 
out 




READOUT MODE 
SWITCH 
(S2110) 



GATED 



F.R. 

(FREE RUN) 



NOTE 

THE READOUT CIRCUIT BOARD IS LOCA- 
TED ON THE RIGHT SIDE OF THE 7844 
AND IN THE TOP RIGHT CENTER OF THE 
R7844. 



1675-14 



Fig. 7-1. Location of Readout Mode Switch on Readout circuit board. 



7 5 



REV JUN 1981 




Instrument Options — 7844/R7844 Service 



CHECK ENHANCER OPERATION 

a. Install a time-base unit in the B HORIZ compartment. 

b. Set the time-base unit sweep rate for 1 ms/div and 
triggering for auto mode with ac coupling from the internal 
source. 



c. CHECK— Rotate the ENHANCER PRESET control 
throughout its range. Notice that the illumination of the crt 
phosphor varies and that the illumination can be 
extinguished. 



d. Set the ENHANCER PRESET control for a visible illu- 
mination of the crt phosphor. 



e. Set the time-base unit sweep rate for 0.1 s/div. 



f. CHECK — The entire crt phosphor is illuminated after 
the sweep has ended and not illuminated during the sweep. 



g. Set the READOUT INTENSITY/PULSED ENHAN- 
CER EXTERNAL or BEAM 2 GATED push button switch to 
EXTERNAL. 



h. CHECK— Press the READOUT INTENSITY/PULSED 
ENHANCER MANUAL push button and notice one momen- 
tary illumination of the crt phosphor. 



7-6 



REV JUN 1981 




Section 8— 7844/R7844 Service 



REPLACEABLE 
ELECTRICAL PARTS 



PARTS ORDERING INFORMATION 



Replacement parts are available from or through your local Tektronix, Inc. Field Office 
or representative. 

Changes to Tektronix instruments are sometimes made to accommodate improved 
components as they become available, and to give you the benefit of the latest circuit 
improvements developed in our engineering department. It is therefore important, when 
ordering parts, to include the following information in your order: Part number, instrument 
type or number, serial number, and modification number if applicable. 

If a part you have ordered has been replaced with a new or improved part, your local 
Tektronix, Inc. Field Off ice or representative will contact you concerning any change in part 
number. 

Change information, if any, is located at the rear of this manual. 



SPECIAL NOTES AND SYMBOLS 

X000 Part first added at this serial number 
00X Part removed after this serial number 



ITEM NAME 

In the Parts List, an Item Name is separated from the description by a colon (:). 
Because of space limitations, an Item Name may sometimes appear as incomplete. For 
further Item Name identification, the U.S. Federal Cataloging Handbook H6-1 can be 
utilized where possible. 



ABBREVIATIONS 



ACTR 


ACTUATOR 


PLSTC 


PLASTIC 


ASSY 


ASSEMBLY 


QTZ 


QUARTZ 


CAP 


CAPACITOR 


RECP 


RECEPTACLE 


CER 


CERAMIC 


RES 


RESISTOR 


CKT 


CIRCUIT 


RF 


RADIO FREQUENCY 


COMP 


COMPOSITION 


SEL 


SELECTED 


CONN 


CONNECTOR 


SEMICOND 


SEMICONDUCTOR 


ELCTLT 


ELECTROLYTIC 


SENS 


SENSITIVE 


ELEC 


ELECTRICAL 


VAR 


VARIABLE 


INCAND 


INCANDESCENT 


WW 


WIREWOUND 


LED 


LIGHT EMITTING DIODE 


XFMR 


TRANSFORMER 


NONWIR 


NON WIREWOUND 


XTAL 


CRYSTAL 



REV, MAY 1981 



8-1 




Replaceable Electrical Parts— 7844/R7844 Service 



Mfr. Code 



0000A 

00853 

01121 

01295 

02111 

02735 

02777 

03508 

03888 

04222 

04713 

05397 

07263 

08806 

11237 

12697 

12954 

12969 

13511 

14298 

14433 

14552 

14604 

15238 

15454 

16299 

18324 

24546 

25088 

26769 

27014 

27193 

32997 

50157 

51642 

52306 

52769 

53944 

55210 

56289 

59660 

71400 

71590 

72982 

73138 

73899 

74276 

74970 

75042 

76493 



CROSS INDEX-MFR. CODE NUMBER TO MANUFACTURER 



Manufacturer 



Address 



City, State, Zip 



LEMO USA 

SANGAMO ELECTRIC CO., S. CAROLINA DIV. 
ALLEN-B RADLEY COMPANY 
TEXAS INSTRUMENTS, INC., SEMICONDUCTOR 
GROUP 

SPECTROL ELECTRONICS CORPORATION 

RCA CORPORATION, SOLID STATE DIVISION 

HOPKINS ENGINEERING COMPANY 

GENERAL ELECTRIC COMPANY, SEMI-CONDUCTOR 

PRODUCTS DEPARTMENT 

KDI PYROFILM CORPORATION 

AVX CERAMICS, DIVISION OF AVX CORP. 

MOTOROLA, INC., SEMICONDUCTOR PROD. DIV. 

UNION CARBIDE CORPORATION, MATERIALS 

SYSTEMS DIVISION 

FAIRCHILD SEMICONDUCTOR, A DIV. OF 
FAIRCHILD CAMERA AND INSTRUMENT CORP. 
GENERAL ELECTRIC CO., MINIATURE 
LAMP PRODUCTS DEPARTMENT 
CTS KEENE, INC. 

CLAROSTAT MFG . CO., INC. 

SIEMENS CORPORATION, COMPONENTS GROUP 
UNITRODE CORPORATION 

AMPHENOL CARDRE DIV., BUNKER RAMO CORP, 
AMERICAN COMPONENTS, INC., AN 
INSILCO COMPANY 
ITT SEMICONDUCTORS 

MICRO SEMICONDUCTOR CORP. 

ELMWOOD SENSORS, INC. 

ITT SEMICONDUCTORS, A DIVISION OF INTER 
NATIONAL TELEPHONE AND TELEGRAPH CORP. 
RODAN INDUSTRIES, INC. 

CORNING GLASS WORKS, ELECTRONIC 
COMPONENTS DIVISION 
SIGNETICS CORP. 

CORNING GLASS WORKS, ELECTRONIC 
COMPONENTS DIVISION 
SIEMENS CORP. 

NCI INC. 

NATIONAL SEMICONDUCTOR CORP. 
CUTLER-HAMMER, INC. 

SPECIALTY PRODUCTS DIVISION 
BOURNS, INC., TRIMPOT PRODUCTS DIV. 
MIDWEST COMPONENTS INC. 

CENTRE ENGINEERING INC. 

HIGH VOLTAGE DEVICES, INC. 

SPRAGUE GOODMAN ELEC., INC. 

ELT INC., GLOW LITE DIVISION 
GETTIG ENG. AND MFG. COMPANY 
SPRAGUE ELECTRIC CO. 

TUSONIX INC. 

BUSSMAN MFG., DIVISION OF MCGRAW- 
EDISON CO. 

CENTRALAB ELECTRONICS, DIV. OF 
GLOBE-UNION, INC. 

ERIE TECHNOLOGICAL PRODUCTS, INC. 

BECKMAN INSTRUMENTS, INC., HELIPOT DIV. 
JFD ELECTRONICS COMPONENTS CORP. 
S1GNAL1.TE DIV., GENERAL INSTRUMENT CORP. 
JOHNSON, E. F., CO. 

TRW ELECTRONIC COMPONENTS, IRC FIXED 
RESISTORS, PHILADELPHIA DIVISION 
BELL INDUSTRIES, INC., 

MILLER, J. W. , DIV. 



2015 SECOND ST. 

P 0 BOX 128 

1201 2ND STREET SOUTH 

P 0 BOX 5012, 13500 N CENTRAL 

EXPRESSWAY 

17070 EAST GALE AVENUE 
ROUTE 202 

12900 FOOTHILL BLVD. 

ELECTRONICS PARK 
60 S JEFFERSON ROAD 
P 0 BOX 867, 19TH AVE. SOUTH 
5005 E MCDOWELL RD,PO BOX 20923 

11901 MADISON AVENUE 

464 ELLIS STREET 

NELA PARK 

3230 RIVERSIDE AVE. 

LOWER WASHINGTON STREET 
8700 E THOMAS RD, P 0 BOX 1390 
580 PLEASANT STREET 



8TH AVE. AT HARRY STREET 
3301 ELECTRONICS WAY 
P 0 BOX 3049 
2830 E FAIRVIEW ST. 

1655 ELMWOOD AVENUE 

P.O. BOX 168, 500 BROADWAY 
2905 BLUE STAR ST. 

3900 ELECTRONICS DR. 

811 E. ARQUES 

550 HIGH STREET 
186 WOOD AVE. S 
5900 AUSTRALIAN AVENUE 
2900 SEMICONDUCTOR DR. 

4201 N. 27TH ST. 

1200 COLUMBIA AVE. 

P. 0. BOX 787 
1981 PORT CITY BLVD. 

2820 E COLLEGE AVENUE 
7485 AVENUE 304 
134 FULTON AVENUE 
BOX 698 

PO BOX 85, OFF ROUTE 45 
87 MARSHALL ST. 

2155 N FORBES BLVD 

2536 W. UNIVERSITY ST. 

P 0 BOX 858 
644 W. 12TH ST. 

2500 HARBOR BLVD. 

PINETREF. ROAD 
1933 HECK AVE. 

299 10TH AVE. S. W. 

401 N. BROAD ST. 

19070 REYES AVE., P 0 BOX 5825 



BERKELEY, CA 94710 
PICKENS, SC 29671 
MILWAUKEE, WI 53204 

DALLAS, TX 75222 
CITY OF INDUSTRY, CA 91745 
SOMERVILLE, NY 08876 
SAN FERNANDO, CA 91342 

SYRACUSE, NY 13201 
WHIPPANY, NJ 07981 
MYRTLE BEACH, SC 29577 
PHOENIX, AZ 85036 

CLEVELAND, OH 44101 

MOUNTAIN VIEW, CA 94042 

CLEVELAND, OH 44112 
PASO ROBLES, CA 93446 
DOVER, NH 03820 
SCOTTSDALE, AZ 85252 
WATERTOWN, MA 02172 
LOS GATOS, CA 95030 

CONSHOHOCKEN, PA 19428 

WEST PALM BEACH, FL 33402 
SANTA ANA, CA 92704 
CRANSTON, RI 02907 

LAWRENCE, MA 01841 
ANAHEIM, CA 92806 

RALEIGH, NC 27604 
SUNNYVALE, CA 94086 

BRADFORD, PA 16701 
ISELIN , NJ 08830 
WEST PALM BEACH, FL 33407 
SANTA CLARA, CA 95051 

MILWAUKEE, WI 53216 
RIVERSIDE, CA 92507 

MUSKEGON, MI 49443 
STATE COLLEGE, PA 16801 
VISALIA, CA 93277 
GARDEN CITY PARK, NY 11040 
PAULS VALLEY, OK 73075 
SPRING MILLS, PA 16875 
NORTH ADAMS, MA 01247 
TUCSON, AZ 85705 

ST. LOUIS, MO 63107 

FORT DODGE, IA 50501 
ERIE, PA 16512 
FULLERTON, CA 92634 
OXFORD, NC 27565 
NEPTUNE, NJ 07753 
WASECA, MN 56093 

PHILADELPHIA, PA 19108 

COMPTON, CA 90224 



8-2 



REV OCT 1981 





Replaceable Electrical Parts— 7844/R7844 Service 



CROSS INDEX-MFR. CODE NUMBER TO MANUFACTURER 



Mfr. Code 


Manufacturer 


Address 


City, State, Zip 


78488 


STACKPOLE CARBON CO. 




ST. MARYS, PA 15857 


79727 


C-W INDUSTRIES 


550 DAVISVILLE RD.,P 0 BOX 96 


WARMINISTER, PA 18974 


80009 


TEKTRONIX, INC. 


P 0 BOX 500 


BEAVERTON, OR 97077 


82389 


SWITCHCRAFT, INC. 


5555 N. ELSTON AVE . 


CHICAGO, IL 60630 


84411 


TRW ELECTRONIC COMPONENTS, TRW CAPACITORS 


112 W. FIRST ST. 


OGALLALA, NE 69153 


90201 


MALLORY CAPACITOR CO., DIV. OF 


3029 E. WASHINGTON STREET 






P. R. MALLORY AND CO., INC. 


P. 0. BOX 372 


INDIANAPOLIS, IN 46206 


91418 


RADIO MATERIALS COMPANY, DIV. OF P.R. 
MALLORY AND COMPANY, INC. 


4242 W BRYN MAWR 


CHICAGO, IL 60646 


91637 


DALE ELECTRONICS, INC. 


P. 0. BOX 609 


COLUMBUS, NE 68601 



REV OCT 1981 



8-3 




Replaceable Electrical Parts— 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eft Dscont 


Name & Description 


Mtr 

Code 


A1 


670-2760-00 






CKT BOARD ASSY : CALIBRATOR 


80009 


A2 


670-0702-03 






CKT BOARD ASSY : GRATICULE LAMPS 


80009 


A3 


670-2762-00 


B010100 


B079999 


CKT BOARD ASSY : CROSSOVER MODE SWITCH 


80009 










(7844 ONLY) 




A3 


670-2762-02 


B080000 




CKT BOARD ASSY : CROSSOVER MODE SWITCH 


80009 










(7844 ONLY) 




A3 


670-2762-00 


B010100 


B069999 


CKT BOARD ASSY: CROSSOVER MODE SWITCH 


80009 










(R7844 ONLY) 




A3 


670-2762-02 


B070000 




CKT BOARD ASSY : CROSSOVER MODE SWITCH 


80009 










( R7844 ONLY) 




A4 


670-2761-00 






CKT BOARD ASSY : DEDICATED MODE SW 


80009 










(OPTION 21 ONLY) 




A5 


670-2765-00 


B010100 


B119999 


CKT BOARD ASSY :MAIN INTERFACE 


80009 


A5 


670-2765-01 


B120000 




CKT BOARD ASSY :MAIN INTERFACE 


80009 


A6 


670-1698-03 






CKT BOARD ASSY: 50 OHM FOLLOWER (LEFT VERTICAL) 


80009 


A7 


670-1698-03 






CKT BOARD ASSY: 50 OHM FOLLOWER( RIGHT VERTICAL) 


80009 


A8 


670-2766-00 


B010100 


B119999 


CKT BOARD ASSY: LOGIC 


80009 


A8 


670-2766-01 


B 120000 


B129999 


CKT BOARD ASSY: LOGIC 


80009 


A8 


670-2766-02 


B130000 




CKT BOARD ASSY: LOGIC 


80009 


A9 


670-2706-00 


B010100 


8131499 


CKT BOARD ASSY: TRIGGER SELECTOR 


80009 










(7844 ONLY) 




A9 


670-2706-02 


B131500 




CKT BOARD ASSY: TRIGGER SELECTOR 


80009 










(7844 ONLY) 




A9 


670-2706-00 


B010100 


B130674 


CKT BOARD ASSY: TRIGGER SELECTOR 


80009 










( R7844 ONLY) 




A9 


670-2706-02 


B130675 




CKT BOARD ASSY: TRIGGER SELECTOR 


80009 










( R7844 ONLY) 




A10 


670-2764-00 


B010100 


B049999 


CKT BOARD ASSY: CROSSOVER VERTICAL INTERFACE 


80009 










(7844 ONLY) 




A10 


670-2764-01 


B050000 




CKT BOARD ASSY : CROSSOVER VERTICAL INTERFACE 


80009 










(7844 ONLY) 




A10 


670-2764-00 


B010100 


B039999 


CKT BOARD ASSY : CROSSOVER VERTICAL INTERFACE 


80009 










(R7844 ONLY) 




A10 


670-2764-01 


B040000 




CKT BOARD ASSY : CROSSOVER VERTICAL INTERFACE 


80009 










( R7844 ONLY) 




A10 


670-2764-01 


XB110795 




CKT BOARD ASSY'.CROSSOVER VERTICAL INTERFACE 


80009 










(7844 OPTION 21 ONLY) 




A10 


670-2764-01 


XB100400 




CKT BOARD ASSY : CROSSOVER VERTICAL INTERFACE 


80009 










(R7844 OPTION 21 ONLY) 




All 


670-2763-00 


B010100 


B110794X 


CKT BOARD ASSY : DEDICATED VERT INTFC 


80009 










(7844 OPTION 21 ONLY) 




All 


670-2763-00 


B010100 


B100399X 


CKT BOARD ASSY : DEDICATED VERT INTFC 


80009 










( R7844 OPTION 21 ONLY) 




A12 


388-2194-00 






CKT BOARD ASSY: DELAY LINE TERMINATION! BEAM 1) 


80009 


A13 


670-2768-00 


B010100 


B039999 


CKT BOARD ASSY : VERTICAL AMPLIFIER( BEAM 1) 


80009 










(7844 ONLY) 




A13 


670-2768-01 


B040000 




CKT BOARD ASSY: VERTICAL AMPLIFIER! BEAM 1) 


80009 










(7844 ONLY) 




A13 


670-2768-00 


B010100 


B029999 


CKT BOARD ASSY : VERTICAL AMPLIFIER! BEAM 1) 


80009 










( R7844 ONLY) 




A13 


670-2768-01 


B030000 




CKT BOARD ASSY : VERTICAL AMPLIFIER! BEAM 1) 


80009 










( R7844 ONLY) 




A14 


670-3720-00 






CKT BOARD ASSY : VERTICAL CONNECT (BEAM 1) 


80009 


A15 


388-2194-00 






CKT BOARD ASSY: DELAY LINE TERMINATION! BEAM 2) 


80009 


A16 


670-2768-00 


B010100 


B039999 


CKT BOARD ASSY : VERTICAL AMPLIFIER( BEAM 2) 


80009 










(7844 ONLY) 




A16 


670-2768-01 


B040000 




CKT BOARD ASSY : VERTICAL AMPL 1 F 1 E R ( BEAM 2) 


80009 



(7844 ONLY) 



Mfr Part Number 

670-2760-00 

670-0702-03 

670-2762-00 

670-2762-02 

670-2762-00 

670-2762-02 

670-2761-00 

670-2765-00 

670-2765-01 

670-1698-03 

670-1698-03 

670-2766-00 

670-2766-01 

670-2766-02 

670-2706-00 

670-2706-02 

670-2706-00 

670-2706-02 

670-2764-00 

670-2764-01 

670-2764-00 

670-2764-01 

670-2764-01 

670-2764-01 

670-2763-00 

670-2763-00 

388-2194-00 

670-2768-00 

670-2768-01 

670-2768-00 

670-2768-01 

670-3720-00 

388-2194-00 

670-2768-00 

670-2768-01 



8-4 



REV OCT 1981 



Replaceable Electrical Parts— 7844/R7844 Service 



Ckt No. 



Tektronix Serial/Model No. 
Part No. Eff Dscont 



Name & Description 



Mfr 

Code Mfr Part Number 



A16 


670-2768-00 


B010100 


B029999 


A16 


670-2768-01 


B030000 




A17 


670-3720-00 






A18 


670-2713-00 






A19 


670-2725-00 


B010100 


B109999 


A19 


670-2725-01 


B110000 


B131384 


A19 


670-2725-02 


B131385 




A19 


670-2725-00 


B010100 


B099999 


A19 


670-2725-01 


B100000 


B130634 


A19 


670-2725-02 


B130635 




A20 


670-2767-00 


B010100 


B109999 


A20 


670-2767-01 


B1 10000 


B131384 


A20 


670-2767-02 


B131385 




A20 


670-2767-00 


B010100 


B099999 


A20 


670-2767-01 


B100000 


B130634 


A20 


670-2767-02 


B130636 




A21 


670-2748-00 


B010100 


B139999 


A2I 


670-2748-01 


B140000 


B142529 


A21 


670-2748-02 


B142530 




A21 


670-2748-01 


B140000 


B141209 


A21 


670-2748-02 


B141210 




A22 


670-2748-00 


B010100 


B139999 


A22 


670-2748-01 


B140000 


B142529 


A22 


670-2748-02 


B142530 




A22 


670-2748-01 


B140000 


B141209 


A22 


670-2748-02 


B141210 




A23 


670-2746-00 


B010100 


B139999 


A23 


670-2746-01 


B140000 


B142027 


A23 


670-2746-02 


B 142028 




A23 


670-2746-01 


B140000 


B141003 


A23 


670-2746-02 


B 141004 





CKT BOARD ASSY : VERTICAL AMPLIFIER (BEAM 2) 
(R7844 ONLY) 

CKT BOARD ASSY : VERTICAL AMPLIFIER( BEAM 2) 
(R7844 ONLY) 

CKT BOARD ASSY : VERTICAL CONNECT ( BEAM 2) 

CKT BOARD ASSY : HORIZONTAL INTERFACE 

CKT BOARD ASSY : HORIZONTAL AMPLIFIER (BEAM 1) 

(7844 ONLY) 

CKT BOARD ASSY : HORIZONTAL AMPLIFIER (BEAM 1) 
(7844 ONLY) 

CKT BOARD ASSY :HORIZONTAL AMPLIFIER(BEAM 1) 
(7844 ONLY) 

CKT BOARD ASSY : HORIZONTAL AMPLIFIER (BEAM 1) 
(R7844 ONLY) 

CKT BOARD ASSY : HORIZONTAL AMPLIFIER (BEAM 1) 
( R7844 ONLY) 

CKT BOARD ASSY : HORIZONTAL AMPLIFIER( BEAM 1) 
( R7844 ONLY) 

CKT BOARD ASSY : HORIZONTAL AMPLIFIER (BEAM 2) 
(7844 ONLY) 

CKT BOARD ASSY '.HORIZONTAL AMPLIFIER( BEAM 2) 
(7844 ONLY) 

CKT BOARD ASSY : HORIZONTAL AMPLIFIER(BEAM 2) 
(7844 ONLY) 

CKT BOARD ASSY : HORIZONTAL AMPLIFIER( BEAM 2) 
(R7844 ONLY) 

CKT BOARD ASSY : HORIZONTAL AMPLIFIER (BEAM 2) 
(R7844 ONLY) 

CKT BOARD ASSY : HORIZONTAL AMPLIFIER (BEAM 2) 
(R7844 ONLY) 

CKT BOARD ASSY : Z-AXIS( BEAM 1) 

CKT BOARD ASSY :Z-AXIS( BEAM 1) 

(7844 ONLY) 

CKT BOARD ASSY :Z-AXIS( BEAM 1) 

(7844 ONLY) 

CKT BOARD ASSY: Z-AXIS ( BEAM 1) 

(R7844 ONLY) 

CKT BOARD ASSY : Z-AXIS ( BEAM 1) 

(R7844 ONLY) 

CKT BOARD ASSY: Z-AXIS (BEAM 2) 

CKT BOARD ASSY: Z-AXIS( BEAM 2) 

(7844 ONLY) 

CKT BOARD ASSY: Z-AXIS (BEAM 2) 

(7844 ONLY) 

CKT BOARD ASSY : Z-AXIS ( BEAM 2) 

(R7844 ONLY) 

CKT BOARD ASSY:Z-AXIS(BEAM 2) 

(R7844 ONLY) 

CKT BOARD ASSY: CRT 
CKT BOARD ASSY: CRT 
(7844 ONLY) 

CKT BOARD ASSY: CRT 
(7844 ONLY) 

CKT BOARD ASSY: CRT 
(R7844 ONLY) 

CKT BOARD ASSY: CRT 
( R7844 ONLY) 



80009 


670-2768-00 


80009 


670-2768-01 


80009 


670-3720-00 


80009 

80009 


670-2713-00 

670-2725-00 


80009 


670-2725-01 


80009 


670-2725-02 


80009 


670-2725-00 


80009 


670-2725-01 


80009 


670-2725-02 


80009 


670-2767-00 


80009 


670-2767-01 


80009 


670-2767-02 


80009 


670-2767-00 


80009 


670-2767-01 


80009 


670-2767-02 


80009 

80009 


670-2748-00 

670-2748-01 


80009 


670-2748-02 


80009 


670-2748-01 


80009 


670-2748-02 


80009 

80009 


670-2748-00 

670-2748-01 


80009 


670-2748-02 


80009 


670-2748-01 


80009 


670-2748-02 


80009 

80009 


670-2746-00 

670-2746-01 


80009 


670-2746-02 


80009 


670-2746-01 


80009 


670-2746-02 



REV OCT 1981 



8-5 



Replaceable Electrical Parts— 7844/R7844 Service 



Tektronix Serial/Model No. Mfr 



Ckt No. 


Part No. 


Etf 


Dscont 


Name & Description 


Code 


Mtr Part Number 


A24 

A25 

A26 


670-2723-00 

670-2770-00 

670-1900-03 


B010100 


B141919 


CKT BOARD ASSY: HIGH VOLTAGE 
CKT BOARD ASSY: SIGNALS OUT 
CKT BOARD ASSY: READOUT 


80009 

80009 

80009 


670-2723-00 

670-2770-00 

670-1900-03 


A26 


670-1900-04 


B141920 




(7844 ONLY) 

CKT BOARD ASSY : READOUT 


80009 


670-1900-04 


A26 


670-1900-03 


B010100 


B140969 


(7844 ONLY) 

CKT BOARD ASSY: READOUT 


80009 


670-1900-03 


A26 


670-1900-04 


B140970 




( R7844 ONLY) 

CKT BOARD ASSY ‘.READOUT 


80009 


670-1900-04 


A27 


670-1610-03 


B010100 


B 100644 


( R7844 ONLY) 

CKT BOARD ASSY .‘POWER SUPPLY INVERTER 


80009 


670-1610-03 


A27 


670-1610-06 


B100645 


B141774 


(7844 ONLY) 

CKT BOARD ASSY: POWER SUPPLY INVERTER 


80009 


670-1610-06 


A27 


670-1610-09 


B 1 4 1 7 7 5 




(7844 ONLY) 

CKT BOARD ASSY : POWER SUPPLY INVERTER 


80009 


670-1610-09 


A27 


670-1610-03 


B010100 


B090319 


(7844 ONLY) 

CKT BOARD ASSY: POWER SUPPLY INVERTER 


80009 


670-1610-03 


A27 


670-1610-06 


B090320 


B140839 


( R7844 ONLY) 

CKT BOARD ASSY: POWER SUPPLY INVERTER 


80009 


670-1610-06 


A27 


670-1610-09 


B140840 




( R7844 ONLY) 

CKT BOARD ASSY: POWER SUPPLY INVERTER 


80009 


670-1610-09 


A28 


670-1612-02 


B010100 


B099999 


(R7844 ONLY) 

CKT BOARD ASSY : CAP-RECTIFIER 


80009 


670-1612-02 


A28 


670-1612-05 


BlOOOOO 


B100644 


(7844 ONLY) 

CKT BOARD ASSY : CAP-RECTIFIER 


80009 


670-1612-05 


A28 


670-1612-07 


B100645 


B141749 


(7844 ONLY) 

CKT BOARD ASSY : CAP-RECTIFIER 


80009 


670-1612-07 


A28 


670-1612-08 


B141750 


B141769 


(7844 ONLY) 

CKT BOARD ASSY : CAP-RECTIFIER 


80009 


670-1612-08 


A28 


670-1612-10 


B141770 


B141854 


(7844 ONLY) 

CKT BOARD ASSY:CAP-RECTIFIER 


80009 


670-1612-10 


A28 


670-1612-13 


B141855 


B142009 


(7844 ONLY) 

CKT BOARD ASSY : CAP-RECTIFIER 


80009 


670-1612-13 


A28 


670-1612-19 


B142010 


B142469 


(7844 ONLY) 

CKT BOARD ASSY : CAP-RECTIFIER 


80009 


670-1612-19 


A28 


670-1612-22 


B142470 




(7844 ONLY) 

CKT BOARD ASSY : CAP-RECTIFIER 


80009 


670-1612-22 


A28 


670-1612-02 


B010100 


B089999 


(7844 ONLY) 

CKT BOARD ASSY : CAP-RECTIFIER 


80009 


670-1612-02 


A28 


670-1612-05 


B090000 


B090319 


( R7844 ONLY) 

CKT BOARD ASSY:CAP-RECTIFIER 


80009 


670-1612-05 


A28 


670-1612-07 


B090320 


B140819 


(R7844 ONLY) 

CKT BOARD ASSY : CAP-RECTIFIER 


80009 


670-1612-07 


A28 


670-1612-08 


B140820 


B140829 


(R7844 ONLY) 

CKT BOARD ASSY : CAP-RECTIFIER 


80009 


670-1612-08 


A28 


670-1612-10 


B140830 


B140874 


( R7844 ONLY) 

CKT BOARD ASSY : CAP-RECTIFIER 


80009 


670-1612-10 


A28 


670-1612-13 


B140875 


B 1 4 1 0 1 9 


( R7844 ONLY) 

CKT BOARD ASSY : CAP-RECTIFIER 


80009 


670-1612-13 


A28 


670-1619-19 


B141020 


B141189 


( R7844 ONLY) 

CKT BOARD ASSY : CAP-RECTIFIER 


80009 


670-1619-19 


A28 


670-1612-22 


B141190 




( R7844 ONLY) 

CKT BOARD ASSY : CAP-RECTIFIER 


80009 


670-1612-22 


A29 


670-1611-01 


B010100 


B142099 


( R7844 ONLY) 

CKT BOARD ASSY: LOW VOLTAGE REGULATOR 


80009 


670-1611-01 


A29 


670-1611-03 


B142100 




(7844 ONLY) 

CKT BOARD ASSY: LOW VOLTAGE REGULATOR 


80009 


670-1611-03 



( 7844 ONLY) 



8-6 



REV OCT 1981, 



Replaceable Electrical Parts— 7844 /R 7844 Service 



Tektronix 
Ckt No. Part No. 



Serial/Model No. 

Eff Dscont 



Name & Description 



Mfr 

Code Mfr Part Number 



A29 


670-1611-01 


B010100 


B141149 


CKT BOARD ASSY: LOW VOLTAGE REGULATOR 
(R7844 ONLY) 

CKT BOARD ASSY: LOW VOLTAGE REGULATOR 
(R7844 ONLY) 

CKT BOARD ASSY : FAN MOTOR 


80009 


670-1611-01 


A29 


670-1611-03 


B141150 




80009 


670-1611-03 


A30 


670-2539-02 






80009 


670-2539-02 


A31 


670-3872-00 


B010100 


B109999 


CKT BOARD ASSY : ENHANCER 
(OPTION 22 ONLY) 

CKT BOARD ASSY : ENHANCER 
(OPTION 22 ONLY) 

CKT BOARD ASSY: READOUT PROTECTION #1 
(7844 ONLY) 


80009 


670-3872-00 


A31 


670-3872-01 


B110000 




80009 


670-3872-01 


A32 


670-4346-00 


XB090000 




80009 


670-4346-00 














A32 


670-4346-00 


XB080000 




CKT BOARD ASSY : READOUT PROTECTION #1 
(R7844 ONLY) 


80009 


670-4346-00 



B2536 


147-0035-00 






MOTOR, DC : BRUSHLESS , 10-15VDC , 145MA 


25088 


1 AD3001-0A 


C2 


283-0068-00 






CAP. 


, FXD ,CER DI : 0 . 01UF ,+100-0% ,500V 


56289 


19C241 


C4 


283-0068-00 






CAP. 


,FXD,CER DI : 0 . 01UF ,+100-0% , 500V 


56289 


19C241 


C12 


283-0111-00 






CAP. 


,FXD,CER DI : 0 . 1UF , 20% , 50V 


72982 


8121-N088Z5U104M 


C14 


283-0111-00 






CAP. 


, FXD ,CER DI : 0 . 1UF ,20% , 50V 


72982 


8121-N088Z5U104M 


C68 


283-0000-00 






CAP. 


, FXD , CER DI : 0 . 001UF , +100-0% , 500V 


59660 


831-519-Z5U-102P 


C69 


283-0000-00 






CAP. 


, FXD,CER D1:0.001UF, +100-0% ,500V 


59660 


831-519-Z5U-102P 


C99 


283-0003-00 






CAP. 


, FXD, CER DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


Cl 04 


290-0308-00 






CAP. 


, FXD , ELCTLT : 1UF , 20% , 35V 


26769 


TEK1 778-0308-00 


Cl 06 


290-0308-00 


B010100 


B010140 


CAP. 


, FXD .ELCTLT : 1UF , 20% , 35V 


26769 


TEK1 7 7 8-0308-00 










(7844 ONLY) 






C106 


290-0263-00 


B010141 




CAP. 


, FXD, ELCTLT: 2. 7UF, 15V 


56289 


162D275X9015CD2 










(7844 ONLY) 






C106 


290-0308-00 


B010100 


B010112 


CAP. 


, FXD, ELCTLT: 1UF,20%,35V 


26769 


TEK1 778-0308-00 










(R7844 ONLY) 






C106 


290-0263-00 


B010113 




CAP. 


, FXD, ELCTLT: 2. 7UF, 15V 


56289 


1 62D275X901 5CD2 










(R7844 ONLY) 






C108 


290-0535-00 






CAP. 


, FXD .ELCTLT : 33UF , 20% , 1 OV 


56289 


196D336X0010KA1 


C145 


290-0425-00 






CAP. 


, FXD, ELCTLT :100UF, 20%, 20V 


90201 


THF107M020P1G 


C146 


290-0271-00 






CAP. 


, FXD , ELCTLT : 9UF , +20-1 5% , 125V 


56289 


109D905C2125F2 


C147 


290-0271-00 






CAP. 


, FXD , ELCTLT : 9UF , + 20- 1 5% , 1 2 5V 


56289 


109D905C2125F2 


C148 


290-0425-00 






CAP. 


, FXD , ELCTLT : 1 OOUF , 20% , 20V 


90201 


THF107M020P1G 


C149 


290-0425-00 






CAP. 


, FXD , ELCTLT : 1 OOUF , 20% , 20V 


90201 


THF107M020P1G 


C202 


283-0003-00 






CAP. 


, FXD, CER DI : 0. 01 UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C208 


283-0003-00 






CAP. 


, FXD , CER DI : 0 . 0 1UF , +80-20% , 1 50V 


91418 


SP103Z151-4R9 


C210 


283-0669-00 






CAP. 


, FXD, MICA D : 360PF , 1% , 500V 


00853 


DI 55F361F0 


C211 


281-0564-00 






CAP. 


, FXD, CER DI : 24PF , 5% , 500V 


59660 


301-000C0G0240J 


C223 


281-0547-00 






CAP. 


, FXD, CER DI : 2 . 7PF, 10% , 500V 


04222 


7001-1321 


C224 


281-0503-00 






CAP. 


, FXD, CER DI : 8PF , +/-0 . 5PF , 500V 


59660 


301-000C0H0809D 


C230 


283-0000-00 






CAP. 


, FXD, CER DI :0.001UF, +100-0%, 500V 


59660 


831-519-Z5U-102P 


C233 


281-0523-00 






CAP. 


, FXD, CER DI : 1 OOPF , +/-20PF , 500V 


72982 


301 -O0OU2MO1O1 M 


C238 


281-0523-00 






CAP. 


, FXD, CER DI : 1 OOPF , +/-20PF , 500V 


72982 


301-000U2M0101M 


C242 


281-0523-00 






CAP. 


, FXD, CER DI : 1 OOPF , +/-20PF , 500V 


72982 


301-000IJ2M0I01M 


C246 


281-0523-00 






CAP. 


, FXD, CER DI : 1 OOPF , +/-20PF , 500V 


72982 


301-000U2M0101M 


C263 


281-0547-00 






CAP. 


, FXD, CER DI:2.7PF,10%, 500V 


04222 


7001-1321 


C264 


281-0503-00 






CAP. 


, FXD, CER DI : 8PF , +/-0 . 5PF , 500V 


59660 


301 -000C0H0809D 


C273 


281-0547-00 






CAP. 


, FXD „CER DI : 2 . 7PF , 10% , 500V 


04222 


7001-1321 


C274 


281-0503-00 






CAP. 


, FXD, CER DI : 8PF, +/-0. 5PF , 500V 


59660 


301-000C0H0809D 


C280 


281-0575-00 






CAP. 


, FXD, CER DI : 39PF , 1% , 500V 


59660 


308-OOOCQG039OF 



REV OCT 1981 



8-7 



Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No, 


Tektronix 
Part No, 


Serial/Model No. 

Eft Dscont 




Name & Description 


Mfr 

Code 


Mfr Part Number 


C281 


281-0575-00 






CAP. 


,FXD,CER DI : 39PF , 1% , 500V 


59660 


308-0OOC0G0390F 


C290 


281-0589-00 


B010100 


B030211X 


CAP. 


.FXD.CER DI : 1 70PF , 5% , 500V 


72982 


301000Z5D01 7 1 J 










(7844 ONLY) 






C290 


281-0589-00 


B010100 


B020123X 


CAP. 


.FXD.CER DI : 170PF , 5% , 500V 


72982 


301000Z5D01 71J 










(R7844 ONLY) 






C290 


281-0589-00 


XB120000 




CAP. 


.FXD.CER DI : 1 70PF, 5% , 500V 


72982 


301000Z5D01 71 J 


C296 


281-0589-00 






CAP. 


.FXD.CER DI : 1 70PF , 5% , 500V 


72982 


301000Z5D0171J 


C334 


283-0177-00 






CAP. 


.FXD.CER DI:1UF, +80-20%, 25V 


56289 


273C5 


C336 


283-0000-00 






CAP. 


.FXD.CER DI : 0. 00 1UF.+ 100-0%, 500V 


59660 


831-519-Z5U-102P 


C337 


283-0000-00 






CAP. 


.FXD.CER DI:0.001UF, +100-0%, 500V 


59660 


831-519-Z5U-102P 


C374 


283-0059-00 






CAP. 


.FXD.CER DI:1UF, +80-20%, 25V 


72982 


8131N031Z5U0105Z 


C376 


283-0000-00 






CAP. 


.FXD.CER DI:0.001UF, +100-0%, 500V 


59660 


831-519-Z5U-102P 


C377 


283-0000-00 






CAP. 


.FXD.CER DI:0.001UF, +100-0%, 500V 


59660 


831-51 9-Z5U-102P 


C391 


283-0177-00 






CAP. 


.FXD.CER DI: 1UF, +80-20%, 25V 


56289 


273C5 


C393 


283-0177-00 






CAP. 


.FXD.CER DI: 1UF, +80-20%, 25V 


56289 


273C5 


C395 


283-0177-00 






CAP. 


.FXD.CER DI:1UF, +80-20%, 25V 


56289 


273C5 


C396 


283-0059-00 






CAP. 


.FXD.CER DI:1UF, +80-20%, 25V 


72982 


8131N031Z5U0105Z 


C397 


283-0177-00 






CAP. 


.FXD.CER DI: 1UF, +80-20%, 25V 


56289 


273C5 


C408 


283-0004-00 






CAP. 


.FXD.CER DI : 0 . 02UF, +80-20% ,150V 


91418 


SP203Z151-4R9 


C424 


283-0004-00 






CAP. 


.FXD.CER DI:0.02UF, +80-20%, 150V 


91418 


SP203Z151-4R9 


C454 


283-0004-00 






CAP. 


.FXD.CER DI:0.02UF, +80-20%, 150V 


91418 


SP203Z151-4R9 


C508 


283-0004-00 






CAP. 


.FXD.CER DI:0.02UF, +80-20%, 150V 


91418 


SP203Z151-4R9 


C524 


283-0004-00 






CAP. 


.FXD.CER DI:0.02UF, +80-20%, 150V 


91418 


SP203Z151-4R9 


C554 


283-0004-00 






CAP. 


.FXD.CER DI:0.02UF, +80-20%, 150V 


91418 


SP203Z151-4R9 


C591 


290-0135-00 


BO 10 100 


B010129 


CAP. 


, FXD .ELCTLT : 15UF , 20% , 20V 


56289 


150D156X0020B2 










(7844 ONLY) 






C591 


290-0145-00 


B010130 


B010135 


CAP. 


, FXD, ELCTLT :10UF, +75-10%, 50V 


56289 


30D106G050CB9 










(7844 ONLY) 






C591 


290-0748-00 


B010136 




CAP. 


, FXD , ELCTLT : 1 OUF , +50-1 0% , 20V 


56289 


500D149 










(7844 ONLY) 






C591 


290-0135-00 


B010100 


B010110 


CAP. 


, FXD , ELCTLT : 15UF, 20% , 20V 


56289 


150D156X0020B2 










(R7844 ONLY) 






C591 


290-0748-00 


BO 101 1 1 




CAP. 


, FXD .ELCTLT : 10UF ,+50-10% , 20V 


56289 


500D149 










( R7844 ONLY) 






C593 


290-0134-00 






CAP. 


, FXD , ELCTLT : 2 2UF , 20% , 1 5V 


56289 


150D226X0015B2 


C597 


290-0135-00 


B010100 


B010129 


CAP. 


, FXD , ELCTLT : 1 5UF , 20% , 20V 


56289 


150D156X0020B2 










(7844 ONLY) 






C597 


290-0145-00 


B010130 


B010135 


CAP. 


, FXD, ELCTLT : 10UF, +75-10%, 50V 


56289 


30D106G050CB9 










(7844 ONLY) 






C597 


290-0748-00 


B010136 




CAP. 


, FXD, ELCTLT:! OUF, +50-10%, 20V 


56289 


500D149 










(7844 ONLY) 






C397 


290-0135-00 


B010100 


B010110 


CAP. 


, FXD .ELCTLT : 1 5UF , 20% , 20V 


56289 


150D156X0020B2 










( R7844 ONLY) 






C59 7 


290-0748-00 


Boioin 




CAP. 


, FXD , ELCTLT : 1 OUF , + 50- 1 0% , 2 OV 


56289 


500D149 










( R7844 ONLY) 






C602 


283-0158-00 


B010100 


B110794X 


CAP. 


.FXD.CER DI : 1PF , 10% , 50V 


72982 


8101B057C0K0109B 










(7844 OPTION 21 ONLY) 






C602 


283-0158-00 


B010100 


B100399X 


CAP. 


.FXD.CER DI : 1PF , 10% , 50V 


72982 


8101B057COK0109B 










( R7844 OPTION 21 ONLY) 






C604 


283-0158-00 


B010100 


B110794X 


CAP. 


.FXD.CER DI : 1PF, 10%, 50V 


72982 


8101B057COK0109B 










(7844 OPTION 21 ONLY) 






C604 


283-0158-00 


B010100 


B100399X 


CAP. 


.FXD.CER DI : 1PF , 10% , 50V 


72982 


8101B057C0K0109B 










( R7844 OPTION 21 ONLY) 






C605 


283-0032-00 


B010100 


B110794X 


CAP. 


.FXD.CER DI : 470PF , 5% , 500V 


72982 


0831085Z5E00471 J 










(7844 OPTION 21 ONLY) 






C605 


283-0032-00 


B010100 


B100399X 


CAP. 


.FXD.CER DI : 470PF, 5% , 500V 


72982 


0831085Z5E00471 J 



(R7844 OPTION 21 ONLY) 



8-8 



REV OCT 1981, 




Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 



Tektronix Serial/Model No. 
Part No. Eff Dscont 



Name & Description 



Mfr 

Code Mfr Part Number 



C606 


283-0210-00 


BO 10100 


B110794X 


CAP. , FXD, CER DI : 0 .0056UF , 20% , 50V 
(7844 OPTION 21 ONLY) 


72982 


8131N145W5R562M 


C606 


283-0210-00 


B010100 


B100399X 


CAP. , FXD, CER DI : 0 . 0056UF , 202 , 50V 
(R7844 OPTION 21 ONLY) 


72982 


8131N145W5R562M 


C615 


283-0032-00 


B010100 


B110794X 


CAP., FXD, CER DI:470PF,52,500V 
(7844 OPTION 21 ONLY) 


72982 


0831085Z5E00471 J 



C615 


283-0032-00 


B010100 


B100399X 


CAP., FXD, CER DI : 470PF , 52 , 500V 
(R7844 OPTION 21 ONLY) 


C616 


283-0210-00 


B010100 


B110794X 


CAP . , FXD , CER DI : 0 . 0056UF , 202 , 50V 
(7844 OPTION 21 ONLY) 


C616 


283-0210-00 


B010100 


B100399X 


CAP . , FXD , CER DI : 0 . 0056UF , 202 , 50V 
(R7844 OPTION 21 ONLY) 



72982 0831085Z5E00471 J 
72982 8131N145W5R562M 
72982 8131N145W5R562M 



C618 


283-0260-00 


B010100 


B110794X 


C618 


283-0260-00 


BO 10100 


B100399X 


C620 


283-0158-00 


B010100 


B110794X 


C620 


283-0158-00 


B010100 


B100399X 


C622 


283-0158-00 


B010100 


B110794X 


C622 


283-0158-00 


B010100 


B100399X 


C702 


283-0158-00 


B010100 


B110794X 


C702 


283-0158-00 


B010100 


B100399X 


C704 


283-0158-00 


B010100 


B110794X 


C704 


283-0158-00 


B010100 


B100399X 


C705 


283-0032-00 


B010100 


B110794X 


C705 


283-0032-00 


B010100 


B100399X 


C706 


283-0210-00 


B010100 


B110794X 


C706 


283-0210-00 


B010100 


B100399X 


C715 


283-0032-00 


B010100 


B110794X 


C715 


283-0032-00 


B010100 


B100399X 


C716 


283-0210-00 


B010100 


B110794X 


C716 


283-0210-00 


B010100 


B 100399X 


C718 


283-0260-00 


B010100 


B110794X 


C718 


283-0260-00 


B010100 


B100399X 


C720 


283-0158-00 


B010100 


B110794X 



CAP.,FXD,CER DI : 5 . 6PF , 52 , 200V 
(7844 OPTION 21 ONLY) 

(NOMINAL VALUE, SELECTED) 

CAP. ,FXD,CER DI : 5 . 6PF , 52 , 200V 
( R7844 OPTION 21 ONLY) 

(NOMINAL VALUE, SELECTED) 

CAP . ,FXD ,CER DI : 1PF , 102 , 50V 
(7844 OPTION 21 ONLY) 

CAP. ,FXD,CER DI:1PF, 102,50V 
(R7844 OPTION 21 ONLY) 

CAP'. ,FXD,CER DI : 1PF , 102 , 50V 
(7844 OPTION 21 ONLY) 

CAP . , FXD , CER DI : 1PF, 102,50V 
( R7844 OPTION 21 ONLY) 

CAP., FXD, CER DI : 1PF, 102,50V 
(7844 OPTION 21 ONLY) 

CAP., FXD, CER DI : 1PF, 102,50V 
(R7844 OPTION 21 ONLY) 

CAP., FXD, CER DI:1PF, 102,50V 
(7844 OPTION 21 ONLY) 

CAP., FXD, CER DI : 1PF, 102 , 50V 
( R7844 OPTION 21 ONLY) 

CAP., FXD, CER DI : 470PF , 5% , 500V 
(7844 OPTION 21 ONLY) 

CAP., FXD, CER DI:470PF, 52,500V 
(R7844 OPTION 21 ONLY) 

CAP . , FXD , CER DI : 0 . 0056UF , 202 , 50V 
(7844 OPTION 21 ONLY) 

CAP . , FXD , CER DI : 0 . 0056UF , 202 , 50V 
( R7844 OPTION 21 ONLY) 

CAP., FXD, CER DI :470PF , 52,500V 
(7844 OPTION 21 ONLY) 

CAP., FXD, CER DI : 470PF , 52 , 500V 
(R7844 OPTION 21 ONLY) 

CAP . , FXD , CER DI : 0 .0056UF , 202 , 50V 
(7844 OPTION 21 ONLY) 

CAP. , FXD, CER DI : 0 .0056UF , 202 , 50V 
( R7844 OPTION 21 ONLY) 

CAP., FXD, CER DI : 5 . 6PF, 52 , 200V 
(7844 OPTION 21 ONLY) 

(NOMINAL VALUE, SELECTED) 

CAP., FXD, CER DI : 5 . 6PF , 52 , 200V 
(R7844 OPTION 21 ONLY) 

(NOMINAL VALUE, SELECTED) 

CAP., FXD, CER DI : 1PF , 102 , 50V 
(7844 OPTION 21 ONLY) 



72982 


81 1 1B200C0G569C 


72982 


81 1 1B200C0G569C 


72982 


8101B057C0K0109B 


72982 


8101B057C0K0109B 


72982 


8101B057C0K0109B 


72982 


8101B057C0KO109B 


72982 


8101B057C0K0109B 


72982 


8101B057C0K0109B 


72982 


8101BO57C0K0109B 


72982 


8101B057C0K0109B 


72982 


0831085Z5E00471 J 


72982 


0831085Z5E00471J 


72982 


8131N145W5R562M 


72982 


8131N145W5R562M 


72982 


0831085Z5E00471 J 


72982 


0831085Z5E00471 J 


72982 


8131N145W5R562M 


72982 


81 31N145W5R562M 


72982 


811 1B200C0G569C 


72982 


811 1B200C0G569C 



72982 8101 B057C0K0109B 



REV OCT 1981 



8-9 




Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No, 


Tektronix 
Part No. 


Serial/ Model No. 

Etf Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Number 


C720 


283-0158-00 


B010100 


B100399X 


CAP. ,FXD,CER DI:1PF,10%,50V 


72982 


8101B057COK0109B 










( R7844 OPTION 21 ONLY) 






C722 


283-0158-00 


B010100 


B110794X 


CAP . , FXD , CER DI : 1PF , 10% , 50V 


72982 


8101B057C0K0109B 










(7844 OPTION 21 ONLY) 






C722 


283-0158-00 


B010100 


B 100399X 


CAP., FXD, CER DI : 1PF , 10% , 50V 


72982 


8101B057C0K0109B 










( R7844 OPTION 21 ONLY) 






C791 


290-0748-00 


B010100 


B110794X 


CAP. , FXD , ELCTLT : 10UF , +50-10% , 20V 


56289 


500D149 










(7844 OPTION 21 ONLY) 






C791 


290-0748-00 


B010100 


B100399X 


CAP. , FXD, ELCTLT: 10UF , +50-10% , 20V 


56289 


500D149 










( R7844 OPTION 21 ONLY) 






C793 


290-0134-00 


B010100 


B110794X 


CAP. , FXD, ELCTLT :22UF, 20%, 15V 


56289 


150D226X001 5B2 










(7844 OPTION 21 ONLY) 






C793 


290-0134-00 


BO 10 100 


B100399X 


CAP . , FXD , ELCTLT : 22UF , 20% , 1 5V 


56289 


1 50D226X001 5B2 










( R7844 OPTION 21 ONLY) 






C802 


281-0505-00 






CAP. , FXD, CER DI: 12PF.+/-1 .2PF.500V 


59660 


301-012C0G0120K 


C822 


281-0505-00 






CAP. , FXD, CER DI:12PF,+/-1.2PF, 500V 


59660 


301-012C0G0120K 


C842 


281-0505-00 






CAP. , FXD, CER DI : 12PF , +/-1 . 2PF , 500V 


59660 


301-012C0G0120K 


C862 


281-0505-00 






CAP., FXD, CER DI : 12PF , +/-1 . 2PF, 500V 


59660 


301-012C0G0120K 


C880 


290-0134-00 






CAP. , FXD, ELCTLT :22UF, 20%, 15V 


56289 


150D226X001 5B2 


C882 


290-0135-00 


B010100 


B010129 


CAP . , FXD , ELCTLT : 15UF, 20% , 20V 


56289 


150D156X0020B2 










(7844 ONLY) 






C882 


290-0145-00 


B010130 


B010135 


CAP. , FXD, ELCTLT: 10UF, +75-10%, 50V 


56289 


30D106G050CB9 










(7844 ONLY) 






C882 


290-0748-00 


B010136 




CAP . , FXD , ELCTLT : 1 OUF , + 50- 1 0% , 2 OV 


56289 


500D149 










(7844 ONLY) 






C882 


290-0135-00 


B010100 


B010110 


CAP. , FXD, ELCTLT: 15UF, 20%, 20V 


56289 


150D156X0020B2 










(R7844 ONLY) 






C882 


290-0748-00 


B010111 




CAP . , FXD , ELCTLT : 10UF , +50-10% , 20V 


56289 


500D149 










(R7844 ONLY) 






C902 


285-1006-00 






CAP. , FXD ,PLSTC : 0 . 22UF , 2% , 50V 


80009 


285-1006-00 


C912 


283-0115-00 






CAP., FXD, CER DI : 47PF , 5% , 200V 


59660 


805-5 19-COFO470J 


C918 


283-0115-00 






CAP., FXD, CER DI : 47PF , 5% , 200V 


59660 


805-51 9-C0F0470J 


C940 


283-0003-00 






CAP. , FXD, CER DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C942 


283-0000-00 






CAP. , FXD, CER DI:0.001UF, +100-0%, 500V 


59660 


831-519-Z5U-102P 


C950 


283-0000-00 






CAP . , FXD , CER DI : 0 . 00 1UF , +100-0% , 500V 


59660 


831-519-Z5U-102P 


C954 


290-0284-00 






CAP. , FXD, ELCTLT: 4. 7UF, 10%, 35V 


56289 


150D475X9035B2 


C962 


283-0003-00 






CAP. , FXD, CER DI : 0 . 01UF , +80-20% , 1 50V 


91418 


SP103Z151-4R9 


C964 


283-0003-00 


B010100 


B010129 


CAP. , FXD, CER DI:0.01UF, +80-20%, 150V 


91418 


SP103Z1 5 1-4R9 










(7844 ONLY) 






C964 


283-0065-00 


B010130 




CAP., FXD, CER DI : 0 . 00 1UF , 5% , 100V 


72982 


805-518-Z5D0102J 










(7844 ONLY) 






C964 


283-0003-00 


B010100 


B010112 


CAP ., FXD , CER DI : 0 . 0 1UF , +80-20% , 1 50V 


91418 


SP103Z151-4R9 










(R7844 ONLY) 






C964 


283-0065-00 


B010113 




CAP., FXD, CER DI : 0 . 001UF , 5% , 100V 


72982 


805-5 18-Z5D0 102 J 










(R7844 ONLY) 






C970 


283-0003-00 






CAP. , FXD, CER DI :0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C972 


283-0110-00 






CAP. , FXD, CER DI:0.005UF, +80-20%, 150V 


56289 


19C242B 


C974 


283-0000-00 






CAP. , FXD, CER DI:0.001UF, +100-0%, 500V 


59660 


831-519-Z5U-102P 


C995 


283-0081-00 






CAP. , FXD, CER DI:0.1UF, +80-20%, 25V 


56289 


36C600 


C997 


283-0081-00 






CAP. , FXD, CER DI:0.1UF, +80-20%, 25V 


56289 


36C600 


C999 


283-0081-00 






CAP ., FXD , CER DI : 0 . 1UF , +80-20% ,25V 


56289 


36C600 


C1006 


283-0065-00 






CAP., FXD, CER DI : 0 . 001UF , 5% , 100V 


72982 


805-5 18-Z5D01 02 J 


C1014 


281-0638-00 






CAP., FXD, CER DI : 240PF , 5% , 500V 


72982 


301000Z5D241 J 


€1026 


283-0065-00 






CAP., FXD, CER DI : 0 . 001UF , 5% , 100V 


72982 


805-5 18-Z5D01 02 J 


C1034 


281-0638-00 






CAP., FXD, CER DI : 240PF , 5% , 500V 


72982 


301000Z5D241 J 


C1052 


281-0547-00 






CAP., FXD, CER DI : 2 . 7PF , 10% , 500V 


04222 


7001-1321 



8-10 



REV OCT 1981 




Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eff Dscont 




Name & Description 


Mfr 

Code 


Mfr Part Number 


C1072 


281-0547-00 






CAP. 


,FXD,CER 


DI : 2 . 7PF , 10% , 500V 


04222 


7001-1321 


C1084 


290-0135-00 


B010100 


B010129 


CAP. 


, FXD , ELCTLT : 1 5UF , 20% , 20V 


56289 


150D156X0020B2 










(7844 ONLY) 








C1084 


290-0145-00 


B010130 


B010135 


CAP. 


, FXD , ELCTLT : 10UF , +75-1 0% , 50V 


56289 


30D106G050CB9 










(7844 ONLY) 








C1084 


290-0748-00 


B010136 




CAP. 


, FXD , ELCTLT: 10UF . +50-10% , 20V 


56289 


500D149 










(7844 ONLY) 








C1084 


290-0135-00 


B010100 


B010110 


CAP. 


, FXD , ELCTLT : 1 5UF , 20% , 20V 


56289 


150D156X0020B2 










(R7844 ONLY) 








Cl 084 


290-0748-00 


B010111 




CAP. 


, FXD , ELCTLT : 10UF , +50-10% , 20V 


56289 


500D149 










(R7844 ONLY) 








C1086 


290-0135-00 


B010100 


B010129 


CAP. 


, FXD. ELCTLT: 15UF,20%,20V 


56289 


150D156X0020B2 










(7844 ONLY) 








C1086 


290-0145-00 


B010130 


B010135 


CAP. 


, FXD , ELCTLT : 10UF , +75-1 0% , 50V 


56289 


30D106G050CB9 










(7844 ONLY) 








C1086 


290-0748-00 


B010136 




CAP. 


,FXD, ELCTLT: 10UF, +50-10%, 20V 


56289 


500D149 










(7844 ONLY) 








C1086 


290-0135-00 


B010100 


B010110 


CAP. 


, FXD , ELCTLT : 1 5UF , 20% , 20V 


56289 


150D156X0020B2 










( R7844 ONLY) 








C1086 


290-0748-00 


B0101 1 1 




CAP. 


, FXD , ELCTLT : 1 OUF , +50-10% , 20V 


56289 


500D149 










(R7844 ONLY) 








C1088 


283-0111-00 






CAP. 


, FXD ,CER 


DI : 0 . 1UF , 20% , 50V 


72982 


8121-N088Z5U104M 


C1090 


283-0000-00 


B010100 


B010112X 


CAP. 


, FXD ,CER 


DI:0.001UF, +100-0%, 500V 


59660 


831-519-Z5U-102P 










(7844 ONLY) 








C1090 


283-0000-00 


B010100 


B010129X 


CAP. 


, FXD, CER 


DI:0.001UF, +100-0%, 500V 


59660 


831-519-Z5U-102P 










(R7844 ONLY) 








C1108 


283-0004-00 






CAP. 


,FXD,CER 


DI:0.02UF, +80-20%, 150V 


91418 


SP203Z151-4R9 


C1118 


283-0004-00 






CAP. 


,FXD,CER 


DI : 0 . 02UF , +80-20% ,150V 


91418 


SP203Z151-4R9 


C1120 


281-0592-00 






CAP. 


,FXD,CER 


DI : 4 . 7PF , +/-0 . 5PF , 500V 


59660 


301-023C0H0479D 


C1122 


283-0004-00 






CAP. 


,FXD,CER 


DI:0.02UF, +80-20%, 150V 


91418 


SP203Z151-4R9 


C1124 


283-0004-00 






CAP. 


, FXD, CER 


DI:0.02UF, +80-20%, 150V 


91418 


SP203Z151-4R9 


C1126 


283-0004-00 






CAP. 


,FXD,CER 


DI:0.02UF, +80-20%, 150V 


91418 


SP203Z151-4R9 


C 1 1 28 


283-0004-00 






CAP. 


, FXD , CER 


DI:0.02UF, +80-20%, 150V 


91418 


SP203Z151-4R9 


C1132 


283-0004-00 






CAP. 


,FXD,CER 


DI:0.02UF, +80-20%, 150V 


91418 


SP203Z151-4R9 


C1140 


283-0004-00 






CAP. 


, FXD, CER 


DI:0.02UF, +80-20%, 150V 


91418 


SP203Z151-4R9 


C1144 


283-0004-00 


B010100 


B139999 


CAP. 


, FXD, CER 


DI:0.02UF, +80-20%, 150V 


91418 


SP203Z151-4R9 


C1144 


283-0414-00 


B140000 




CAP. 


, FXD, CER 


DI : 0 . 022UF , 20% , 500V 


51642 


300-500X7R223M 


Cl 1 50 


283-0004-00 


B010100 


B139999 


CAP. 


, FXD, CER 


DI : 0 . 02UF , +80-20% , 1 50V 


91418 


SP203Z151-4R9 


C1150 


283-0414-00 


B140000 




CAP. 


, FXD, CER 


DI : 0 . 022UF , 20% , 500V 


51642 


300-500X7R223M 


C1162 


281-0661-00 






CAP. 


, FXD, CER 


DI : 0 . 8PF , +/-0 . 1PF , 500V 


04222 


7001-1268 


Cl 164 


281-0546-00 






CAP. 


, FXD, CER 


DI : 330PF , 10% , 500V 


04222 


7001-1380 


Cl 168 


281-0153-00 






CAP. 


, VAR, AIR 


DI : 1 . 7-1 OPF ,250V 


74970 


187-0106-005 


Cl 1 72 


281-0168-00 






CAP. 


, VAR, AIR 


DI:1. 3-5. 4PF, 250V 


74970 


187-0103-035 


C1186 


281-0627-00 






CAP. 


, FXD, CER 


DI : 1PF ,+/-0 . 25PF , 500V 


04222 


7001-1340 


C1190 


283-0004-00 


B010100 


B139999 


CAP. 


, FXD, CER 


DI:0.02UF, +80-20%, 150V 


91418 


SP203Z151-4R9 


C1190 


283-0414-00 


B140000 




CAP. 


, FXD, CER 


DI : 0.022UF,20%, 500V 


51642 


300-500X7R223M 


C1192 


283-0177-00 






CAP. 


, FXD, CER 


DI:1UF, +80-20%, 25V 


56289 


273C5 


Cl 194 


283-0177-00 






CAP. 


, FXD, CER 


DI:1UF, +80-20%, 25V 


56289 


273C5 


Cl 196 


283-0177-00 






CAP. 


, FXD, CER 


DI: 1UF, +80-20%, 25V 


56289 


273C5 


Cl 198 


283-0004-00 






CAP. 


, FXD, CER 


DI:0.02UF, +80-20%, 150V 


91418 


SP203Z151-4R9 


C1205 


283-0022-00 






CAP. 


, FXD, CER 


DI : 0 . 02UF , 1400VDCAC 


91418 


AU203-ZI42-1R0 


C1206 


283-0022-00 






CAP. 


, FXD, CER 


DI : 0 . 02UF , 1400VDCAC 


91418 


AU203-Z142-1R0 


C1216 


290-0628-00 






CAP. 


, FXD , ELCTLT : 950UF , +50-1 0% , 200V 


56289 


36D7560 


C 1 2 1 7 


290-0628-00 






CAP. 


, FXD, ELCTLT :950UF, +50-10%, 200V 


56289 


36D7560 


Cl 2 1 9 


283-0057-00 






CAP. 


, FXD, CER 


DI:0.1UF, +80-20%, 200V 


56289 


274C10 


C1227 


283-0280-00 






CAP. 


, FXD, CER 


DI:2200PF, 10%, 2000V 


56289 


562CBA202EH222KA 


C1228 


283-0280-00 






CAP. 


, FXD, CER 


DI:2200PF, 10%, 2000V 


56289 


562CBA202EH222KA 



REV OCT 1981 



8-11 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eft 


Dscont 


C1229 


285-0939-00 






C1231 


290-0395-00 






C1235 


283-0078-00 


8010100 


B141744 


C1235 


283-0060-00 


B141745 




C1235 


283-0078-00 


B010100 


B140834 


C1235 


283-0060-00 


B140835 




C1236 


283-0280-00 






C1237 


285-0938-00 






C1238 


283-0279-00 






C1239 


290-0395-00 






C1242 


283-0001-00 






C1243 


290-0159-00 






C1245 


283-0003-00 






C1249 


290-0164-00 






C1253 


283-0003-00 






C1254 


283-0003-00 






C1256 


283-0003-00 






C1259 


290-0523-00 






C1264 


290-0573-00 






C1267 


290-0523-00 






C1275 


283-0060-00 


B010100 


B141809 


C1275 


283-0076-00 


B141810 


B141854 


C1275 


283-0060-00 


B141855 




C1275 


283-0060-00 


B010100 


B140853 


C1275 


283-0076-00 


B140854 


B140874 


C1275 


283-0060-00 


B140875 




C1275 








C1276 


283-0060-00 


B010100 


B141809 


C1276 


283-0076-00 


B141810 


B141854 


C1276 


283-0060-00 


B141855 




C1276 


283-0060-00 


BO 10100 


B140853 


C1276 


283-0076-00 


B140854 


B140874 


C1276 


283-0060-00 


B140875 




C1277 


290-0572-00 


B010100 


B141749 


Cl 277 


290-0523-00 


B141750 


B142009 


C1277 


290-0522-00 


B142010 




C1277 


290-0572-00 


B010100 


B140819 


C1277 


290-0523-00 


B140820 


B141019 



Name & Description 



CAP . , FXD ,PLSTC : 3UF , 5% ,400V 
CAP . , FXD , ELCTLT :4 . 7UF , 20% , 50V 
CAP. , FXD, CER DI : 0 .001UF ,20% , 500V 
(7844 ONLY) 

CAP.,FXD,CER DI : 100PF , 5% , 200V 
(7844 ONLY) 

CAP. ,FXD,CER DI : 0 .001UF , 20% , 500V 
(R7844 ONLY) 

CAP.,FXD,CER DI : 100PF , 5% , 200V 
( R7844 ONLY) 

CAP. ,FXD,CER DI : 2200PF , 10% , 2000V 
CAP. , FXD ,PLSTC :0 . 03UF , 5% , 600V 

CAP. ,FXD,CER DI:0.001UF, 20% ,3000V 
CAP . , FXD , ELCTLT : 4 . 7UF , 20% , 50V 
CAP. .FXD.CER DI:0.005UF, +100-0%, 500V 
CAP . , FXD , ELCTLT : 2UF , +50- 1 0% , 1 50V 
CAP . , FXD , CER DI : 0 . 0 1 UF , +80-20% , 1 50V 
CAP. , FXD, ELCTLT: 1UF , +50-10% , 150V 

CAP. , FXD, CER DI : 0 . 01UF ,+80-20% ,150V 
CAP. , FXD, CER DI:0.01UF, +80-20%, 150V 
CAP . , FXD.CER DI : 0 . 01 UF , +80-20% , 1 50V 
CAP . , FXD , ELCTLT : 2 . 2UF , 20% , 20V 
CAP. , FXD, ELCTLT: 2. 7UF, 20%, 50V 
CAP . , FXD , ELCTLT : 2 . 2UF , 20% , 20V 

CAP., FXD, CER DI : 100PF , 5% , 200V 
(7844 ONLY) 

CAP., FXD, CER DI : 27PF, 10% ,500V 
(7844 ONLY) 

CAP., FXD, CER DI : 100PF , 5% , 200V 
(7844 ONLY) 

CAP., FXD, CER DI : 100PF , 5% , 200V 
(R7844 ONLY) 

CAP., FXD, CER DI : 27PF , 10% , 500V 
(R7844 ONLY) 

CAP., FXD, CER DI : 100PF , 5% , 200V 
(R7844 ONLY) 

CAP., FXD, CER DI : 100PF, 5% , 200V 
(7844 ONLY) 

CAP., FXD, CER DI : 27PF , 10% , 500V 
(7844 ONLY) 

CAP., FXD, CER DI : 100PF , 5% , 200V 
(7844 ONLY) 

CAP., FXD, CER DI : 100PF, 5% , 200V 
( R7844 ONLY) 

CAP., FXD, CER DI : 27PF , 10% , 500V 
(R7844 ONLY) 

CAP., FXD, CER DI : 100PF , 5% , 200V 
(R7844 ONLY) 

CAP. , FXD, ELCTLT : 0. 1UF, 20%, 50V 
(7844 ONLY) 

CAP. , FXD, ELCTLT: 2. 2UF, 20%, 20V 
(7844 ONLY) 

CAP. , FXD, ELCTLT : 1UF, 20%, 50V 
(7844 ONLY) 

CAP. , FXD, ELCTLT :0.1UF, 20%, 50V 
(R7844 ONLY) 

CAP. , FXD, ELCTLT: 2. 2UF, 20%, 20V 
( R7844 ONLY) 



Mfr 

Code Mfr Part Number 



84411 

56289 

56289 


TEK1 11-30594 

150D475X0050B2 

20C114A8 


72982 


855-535U2J101 J 


56289 


20C114A8 


72982 


855-535U2J101 J 


56289 

56289 


562CBA202EH222KA 

AF8B1G303J004 


56289 

56289 

72982 

56289 

91418 

56289 


55C153 

150D475X0050B2 

831-559E502P 

30D205F150BB9 

SP103Z151-4R9 

500D105F150BA7 


91418 

91418 

91418 

56289 

56289 

56289 


SP103Z151-4R9 

SP103Z151-4R9 

SP103Z151-4R9 

196D225X0020HA1 

196D275X0050JA1 

196D225X0020HA1 


72982 


855-535U2J101 J 


56289 


40C287A2 


72982 


855-535U2J10U 


72982 


855-535U2J101 J 


56289 


40C287A2 


72982 


855-535U2J101J 


72982 


855-535U2J101J 


56289 


40C287A2 


72982 


855-535U2J101 J 


72982 


855-535U2J101J 


56289 


40C287A2 


72982 


855-535U2J101 J 


56289 


196D104X0050HA1 


56289 


196D225X0020HA1 


56289 


196D105X0050HA1 


56289 


196D104X0050HA1 


56289 


1 96D225X0020HA1 



8-12 



REV OCT 1981, 




Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eft Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Number 


C1277 


290-0522-00 


B141020 




CAP . , FXD .ELCTLT : 1UF , 20% , 50V 


56289 


196D105X0050HA1 










(R7844 ONLY) 






C1278 


290-0572-00 


B010100 


B141749 


CAP . , FXD ,ELCTLT : 0 . 1UF , 20% , 50V 


56289 


196D104X0050HA1 










(7844 ONLY) 






C1278 


290-0523-00 


B141750 


B142009 


CAP . , FXD , ELCTLT : 2 . 2UF , 20% , 20V 


56289 


196D225X0020HA1 










(7844 ONLY) 






C1278 


290-0522-00 


B142010 




CAP . , FXD , ELCTLT : 1UF , 20% , 50V 


56289 


196D105X0050HA1 










(7844 ONLY) 






C1278 


290-0572-00 


B010100 


B140819 


CAP. , FXD, ELCTLT :0.1UF, 20% ,50V 


56289 


196D 104X00 50HA1 










(R7844 ONLY) 






C1278 


290-0523-00 


B140820 


B141019 


CAP. , FXD, ELCTLT: 2. 2UF, 20%, 20V 


56289 


1 96D225X0020HA1 










(R7844 ONLY) 






C1278 


290-0522-00 


B141020 




CAP. , FXD, ELCTLT : 1UF, 20% ,50V 


56289 


196D105X0050HA1 










( R7844 ONLY) 






C1285 


283-0092-00 






CAP. , FXD.CER DI:0.03UF, +80-20%, 200V 


72982 


845-534E303Z 


C1298 


283-0023-00 






CAP. .FXD.CER DI:0.1UF, +80-20%, 12V 


91418 


MX0104Z1205R5 


C1300 


283-0078-00 






CAP. ,FXD,CER DI : 0 . 001UF, 20% , 500V 


56289 


20C114A8 


Cl 301 


283-0078-00 






CAP., FXD.CER DI : 0 . 001UF, 20% , 500V 


56289 


20C114A8 


C1302 


283-0003-00 






CAP. , FXD.CER DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C1313 


290-0425-00 






CAP. , FXD, ELCTLT : 100UF, 20%, 20V 


90201 


THF107M020P1G 


C1314 


290-0529-00 






CAP . , FXD , ELCTLT : 47UF , 20% , 20V 


05397 


T368C476M020AZ 


C 1 3 1 6 


290-0425-00 






CAP . , FXD , ELCTLT :100UF,20%,20V 


90201 


THF107M020P1G 


C1317 


290-0519-00 






CAP. , FXD, ELCTLT: 100UF , 20% , 20V 


90201 


TDC107M020WLD 


C1318 


290-0519-00 






CAP . , FXD , ELCTLT : 1 OOUF , 20% , 20V 


90201 


TDC107M020WLD 


C1326 


283-0211-00 


B010100 


B142009 


CAP., FXD.CER DI:0.1UF,10%, 200V 


72982 


8141N210X7R0104K 










(7844 ONLY) 






C1326 


283-0208-00 


B142010 




CAP., FXD.CER Dl : 0. 22UF , 10% , 200V 


72982 


81 51N230 C 224K 










(7844 ONLY) 






C1326 


283-0211-00 


B010100 


B141019 


CAP., FXD.CER DI : 0 . 1UF , 10% , 200V 


72982 


8141N210X7R0104K 










( R7844 ONLY) 






C1326 


283-0208-00 


B141020 




CAP., FXD.CER DI :0. 22UF, 10%, 200V 


72982 


81 51N230 C 224K 










( R7844 ONLY) 






C1328 


290-0582-00 






CAP . , FXD , ELCTLT : 5UF , +75-10%, 150V 


90201 


TT5R0N1 50C0P3P 


C1330 


290-0582-00 






CAP . , FXD , ELCTLT : 5UF , + 75- 1 0% , 1 50V 


90201 


TT5R0N150C0P3P 


C1331 


283-0057-00 






CAP ..FXD.CER DI : 0 . 1UF , +80-20% , 200V 


56289 


274C10 


C1350 


290-0425-00 






CAP . , FXD , ELCTLT : 1 OOUF , 20% , 20V 


90201 


THF107M020P1G 


C1351 


290-0425-00 






CAP. , FXD, ELCTLT: 100UF, 20%, 20V 


90201 


THF107M020P1G 


C1353 


290-0529-00 






CAP . , FXD, ELCTLT : 47UF , 20% , 20V 


05397 


T368C476M020AZ 


C1354 


290-0529-00 






CAP. , FXD, ELCTLT :47UF, 20%, 20V 


05397 


T368C476M020AZ 


C1358 


290-0194-00 






CAP. , FXD, ELCTLT: 10UF, +50-10%, 100V 


56289 


30D106F100DC2 


C1360 


290-0270-00 


B010100 


B010129 


CAP . , FXD , ELCTLT : 8 . 2UF , 20% , 60V 


56289 


150D825X0060R2 


C1360 


290-0716-00 


B010130 




CAP. , FXD .ELCTLT : 8 . 2UF , 20% , 75V 


05397 


T11C825M075AS 


C1362 


290-0194-00 






CAP . , FXD , ELCTLT : 1 OUF , + 5 0- 1 0% , 1 00V 


56289 


30D106F100DC2 


Cl 364 


290-0270-00 


B010100 


B010129 


CAP . , FXD .ELCTLT :8.2UF,20%,60V 


56289 


1 50D825X0060R2 


C1364 


290-0716-00 


B010130 




CAP . , FXD , ELCTLT : 8 . 2UF , 20% , 75V 


05397 


T11C825M075AS 


C1371 


290-0572-00 


B010100 


B100644 


CAP. , FXD, ELCTLT :0.1UF, 20%, 50V 


56289 


196D104X0050HA1 










(7844 ONLY) 






C1371 


290-0580-00 


B100645 




CAP. , FXD, ELCTLT: 0.2 7UF, 20%, 50V 


56289 


196D274X0050HA1 










(7844 ONLY) 






C1371 


290-0572-00 


B010100 


B090319 


CAP. , FXD .ELCTLT : 0 . 1UF , 20% , 50V 


56289 


196D104X0050HA1 










( R7844 ONLY) 






C1371 


290-0580-00 


B090320 




CAP. , FXD , ELCTLT : 0 . 27UF , 20% , 50V 


56289 


196D274X0050HA1 










( R7844 ONLY) 






Cl 392 


283-0057-00 






CAP. , FXD.CER DI:0.1UF, +80-20%, 200V 


56289 


274C10 


C1395 


283-0003-00 






CAP. , FXD.CER DI:0.01UF, +80-20%, 150V 


91418 


SP103Z1 51-4R9 


C1397 


283-0003-00 






CAP. , FXD.CER DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 



REV OCT 1981 



8-13 





Replaceable Electrical Parts— 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eft Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Number 


C1413 


283-0078-00 






CAP . , FXD , CER DI : 0 . 00 1UF , 20% , 500V 


56289 


20C114A8 


C1416 


283-0084-00 






CAP . , FXD ,CER DI : 270PF , 5% ,1000V 


72982 


838-533B271 J 


C1436 


283-0078-00 






CAP. , FXD, CER DI : 0 . 001UF , 202. , 500V 


56289 


20C114A8 


C1441 


283-0078-00 






CAP., FXD, CER DI : 0 . 001UF , 20% , 500V 


56289 


20C114A8 


C1451 


283-0078-00 






CAP., FXD, CER DI : 0 . 001UF , 20% , 500V 


56289 


20C114A8 


C1463 


283-0078-00 






CAP., FXD, CER DI : 0. 001UF, 20% , 500V 


56289 


20C114A8 


C1481 


283-0078-00 






CAP., FXD, CER DI : 0 . 001UF , 20% , 500V 


56289 


20C114A8 


C1495 


283-0078-00 






CAP. , FXD, CER DI : 0 . 001UF , 20% , 500V 


56289 


20C114A8 


C1506 


283-0068-00 






CAP. , FXD, CER DI:0.01UF, +100-0%, 500V 


56289 


19C241 


C1511 


290-0572-00 






CAP . , FXD ,ELCTLT : 0 . 1UF, 20% , 50V 


56289 


196D104X005 OHA 1 


C1518 


283-0078-00 






CAP., FXD, CER DI : 0 . OOlUF , 20% , 500V 


56289 


20C114A8 


Cl 324 


283-0068-00 


XB142100 




CAP. , FXD, CER DI:0.01UF, +100-0%, 500V 


56289 


19C241 










(7844 ONLY) 






C1524 


283-0068-00 


XB141150 




CAP. , FXD, CER DI-.0.01UF, + 100-0%, 500V 


56289 


19C241 










(R7844 ONLY) 






C1533 


283-0078-00 






CAP . , FXD , CER DI : 0. OOlUF , 20% , 500V 


56289 


20C114A8 


C1571 


283-0128-00 






CAP., FXD, CER DI : 100PF , 5% , 500V 


72982 


871 -536T2H101 J 


C1629 


283-0000-00 






CAP. , FXD, CER DI :0. OOlUF, +100-0%, 500V 


59660 


831 -519-Z5U-102P 


Cl 634 


283-0003-00 


B010100 


B010135 


CAP., FXD, CER D1:0.01UF, +80-20%, 150V 


91418 


SP1 03Z1 51-4R9 










(7844 ONLY) 






C1634 


283-0002-00 


B010136 




CAP. , FXD, CER DI :0.01UF, +80-20%, 500V 


91418 


811-546E103Z 










(7844 ONLY) 






Cl 634 


283-0003-00 


B010100 


B010109 


CAP. , FXD, CER DI;0.01UF, +80-20%, 150V 


91418 


SP1 03Z151-4R9 










( R7844 ONLY) 






C1634 


283-0002-00 


B010110 




CAP. , FXD, CER DI:0.01UF, +80-20%, 500V 


91418 


811-546E103Z 










(R7844 ONLY) 






C1635 


283-0003-00 






CAP. , FXD, CER DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C1637 


283-0000-00 






CAP. , FXD, CER DI:0. OOlUF, +100-0%, 500V 


59660 


831-519-Z5U-102P 


C1657 


283-0185-00 






CAP., FXD, CER DI : 2 . 5PF , 5% , 50V 


72982 


8101 B057C0K0295B 


C1658 


281-0151-00 






CAP., VAR, CER DI : 1-3PF , 100V 


72982 


518-600A1-3 


C1659 


283-0185-00 






CAP., FXD, CER DI : 2 . 5PF , 5% , 50V 


72982 


8101B057C0K0295B 


C1662 


281-0603-00 






CAP., FXD, CER DI : 39PF , 5% , 500V 


59660 


308-000C0G0390J 


C1663 


281-0603-00 






CAP., FXD, CER DI : 39PF , 5% , 500V 


59660 


3O8-OOOCOG0390J 


C1670 


281-0543-00 






CAP., FXD, CER DI : 270PF , 10% , 500V 


72982 


301055X5P271K 


C1672 


281-0543-00 






CAP., FXD, CER DI : 270PF , 10% , 500V 


72982 


301055X5P271K 


C1675 


283-0160-00 






CAP., FXD, CER DI : 1 . 5PF ,10%, 50V 


72982 


8101 A058C0K1 59B 


C1676 


283-0181-00 






CAP . , FXD ,CER DI:1.8PF,10%,100V 


72982 


8101B121C0K0189B 


C1680 


283-0181-00 






CAP., FXD, CER DI:1.8PF,10%, 100V 


72982 


8101B121C0K0189B 


C1681 


283-0160-00 






CAP., FXD, CER DI : 1 . 5PF , 10% , 50V 


72982 


8101A058C0K1 59 B 


C1685 


281-0543-00 






CAP., FXD, CER DI : 270PF , 10% , 500V 


72982 


301 055X5P271K 


C1689 


281-0543-00 






CAP., FXD, CER DI : 270PF , 10% , 500V 


72982 


301055X5P271K 


C1692 


283-0065-00 






CAP., FXD, CER DI : 0 . OOlUF , 5% , 100V 


72982 


805-518-Z5D0102J 


Cl 734 


283-0181-00 






CAP., FXD, CER DI : 1 . 8PF , 10% , 1 00V 


72982 


8101B121C0K0189B 


Cl 736 


283-0185-00 


B010100 


B142329 


CAP. , FXD, CER DI : 2 . 5PF , 5% , 50V 


72982 


8101B057C0K0295B 










(NOMINAL VALUE, SELECTED 7844 ONLY) 






C1736 


283-0158-00 


B142330 




CAP., FXD, CER DI : 1PF , 10% , 50V 


72982 


8101B057CDK0109B 










(NOMINAL VALUE, SELECTED 7844 ONLY) 






Cl 736 


283-0185-00 


BO 10 100 


B141119 


CAP., FXD, CER DI : 2 . 5PF , 5% , 50V 


72982 


81O1BO57COK0295B 










(NOMINAL VALUE, SELECTED R7844 ONLY) 






C1736 


283-0158-00 


B 1 4 1 120 




CAP., FXD, CER DI : 1PF , 10% , 50V 


72982 


8101B057C0K0109B 










(NOMINAL VALUE, SELECTED R7844 ONLY) 






C1738 


283-0181-00 






CAP., FXD, CER DI : 1 . 8PF , 10% , 100V 


72982 


8101B121COK0189B 


Cl 739 


283-0160-00 






CAP., FXD, CER DI : 1 . 5PF , 10% , 50V 


72982 


8101A058C0K159B 


Cl 743 


283-0128-00 






CAP., FXD, CER DI:100PF,5%,500V 


72982 


871-536T2H101 J 


Cl 745 


283-0114-00 






CAP., FXD, CER DI:0.0015UF,5%,200V 


72982 


805-509B152J 


Cl 747 


283-0239-00 






CAP., FXD, CER DI : 0 . 022UF , 10% , 50V 


72982 


812 1N083X7R0223K 


C 1 749 


283-0203-00 






CAP., FXD, CER DI:0.47UF,20%, 50V 


72982 


81 31N075E474M 



8-14 



REV OCT 1981 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eft 


Dscont 


C1753 


283-0160-00 






C1758 


283-0108-00 






Cl 760 


283-0180-00 






Cl 762 


283-0211-00 






Cl 764 


283-0212-00 






C1770 


283-0001-00 






C1783 


283-0001-00 






C1787 


283-0001-00 






C1789 


283-0001-00 






C1791 


283-0001-00 






Cl 794 


283-0001-00 






C1796 


283-0001-00 






C1798 


283-0001-00 






C1820 


283-0000-00 


B010100 


B099999X 


C1820 


283-0000-00 


B010100 


B109999X 


C1822 


283-0000-00 


B010100 


B099999X 


C1822 


283-0000-00 


B010100 


B109999X 


C1826 


281-0511-00 


B010100 


B099999X 


C1826 


281-0511-00 


B010100 


B 109999X 


C1831 


281-0509-00 


XB030000 


B099999X 


C1831 


281-0509-00 


XB020000 


B109999X 


C1842 


281-0504-00 


B010100 


B099999X 


C1842 


281-0504-00 


B010100 


B109999X 


Cl 844 


281-0557-00 


B010100 


B099999X 


Cl 844 


281-0557-00 


B010100 


B109999X 


C1852 


281-0504-00 


B010100 


B099999X 


C1852 


281-0504-00 


B010100 


B109999X 


C1854 


281-0557-00 


B010100 


B099999X 


C1854 


281-0557-00 


BO 10100 


B109999X 


C 1860 


283-0635-00 


B010100 


B099999X 


C1860 


283-0635-00 


B010100 


B109999X 


C1862 


281-0118-00 


B010100 


B099999X 


C1862 


281-0118-00 


B010100 


B109999X 


C1867 


283-0004-00 


B010100 


B099999X 


C1867 


283-0004-00 


BO 10 100 


B109999X 



Name & Description 



CAP.,FXD,CER DI : 1 . 5PF , 10% , 50V 
CAP.,FXD,CER DI:220PF,10%, 200V 
(NOMINAL VALUE .SELECTED) 

CAP . , FXD ,CER DI : 5600PF , 20% , 200V 
CAP , , FXD ,CER DI : 0 . 1UF, 10% , 200V 
CAP. ,FXD,CER DI : 2UF , 20% , 50V 



CAP. , FXD.CER 
CAP. ,FXD,CER 
CAP. , FXD.CER 
CAP. ,FXD,CER 
CAP. ,FXD,CER 
CAP. ,FXD,CER 



DI : 0 . 005UF , + 100-0% , 500V 
DI : 0.005UF ,+100-0% , 500V 
DI:0.005UF, +100-0%, 500V 
DI:0.005UF, +100-0%, 500V 
DI:0.005UF, +100-0%, 500V 
DI : 0 . 005UF , + 1 00-0% , 500V 



CAP. .FXD.CER DI:0.005UF,+ 100-0%, 500V 
CAP. , FXD ,CER DI:0.005UF, +100-0%, 500V 
CAP. ,FXD,CER DI:0.001UF, +100-0%, 500V 
( R7844 ONLY) 

CAP. , FXD ,CER DI:0.001UF, +100-0%, 500V 
(7844 ONLY) 



CAP. .FXD.CER 
( R7844 ONLY) 
CAP. , FXD.CER 
(7844 ONLY) 
CAP. , FXD.CER 
(R7844 ONLY) 



DI:0.001UF,+ 100-0%, 500V 
DI:0.001UF, +100-0%, 500V 
DI:22PF,+/-2.2PF, 500V 



CAP. , FXD.CER DI : 22PF , +/-2 . 2PF , 500V 
(7844 ONLY) 

CAP. , FXD.CER DI : 15PF , +/-1 . 5PF , 500V 
(R7844 ONLY) 

CAP. .FXD.CER DI : 15PF.+/-1 . 5PF, 500V 
(7844 ONLY) 



CAP., FXD.CER DI : 10PF.+/-1PF.500V 
( R7844 ONLY) 

CAP., FXD.CER DI: 10PF.+/-1PF.500V 
(7844 ONLY) 

CAP., FXD.CER DI : 1 . 8PF ,10%, 500V 
(R7844 ONLY) 



CAP., FXD.CER DI:1.8PF,10%,500V 
(7844 ONLY) 

CAP., FXD.CER DI: 10PF .+/-1PF , 500V 
( R7844 ONLY) 

CAP., FXD.CER DI: 1 OPF . +/-1PF , 500V 
(7844 ONLY) 



CAP. .FXD.CER DI : 1 . 8PF , 10% , 500V 
( R7844 ONLY) 

CAP. .FXD.CER DI : 1 . 8PF , 10% , 500V 
(7844 ONLY) 

CAP. , FXD, MICA D : 51 PF , 1 % , 100V 
( R7844 ONLY) 

CAP. , FXD, MICA D: 51 PF , 1 % , 1 00V 
(7844 ONLY) 

CAP. , VAR, MICA D:8-90PF, 175V 
( R7844 ONLY) 

CAP. .VAR, MICA D: 8-90PF, 175V 
(7844 ONLY) 

CAP. .FXD.CER DI :0.D2UF, +80-20%, 150V 
( R7844 ONLY) 

CAP. .FXD.CER DI:0.02UF, +80-20%, 150V 
(7844 ONLY) 



Mfr 

Code Mfr Part Number 



72982 

56289 


8101A058C0K1 59B 
272C13 


72982 

72982 

72982 


8121N204 E 562M 

8141N210X7R0104K 

8141N064Z5U205M 


72982 

72982 

72982 

72982 

72982 

72982 


831-559E502P 

831-559E502P 

831-559E502P 

831-559E502P 

831-559E502P 

831-559E502P 


72982 

72982 

59660 


831-559E502P 

831-559E502P 

831-519-Z5U-102P 


59660 


831-519-Z5U-102P 


59660 


831-519-Z5U-102P 


59660 


831-519-Z5U-102P 


59660 


3O1-O0OCOG022OK 


59660 


301-000C0G0220K 


59660 


301-O0OCOGO15OK 


59660 


3O1-0OOC0GO15OK 


59660 


301-055COG0100F 


59660 


301-055COG0100F 


04222 


7001-1324 


04222 


7001-1324 


59660 


301-055C0G0100F 


59660 


301-055COG0100F 


04222 


7001-1324 


04222 


7001-1324 


00853 


D151E510F0 


00853 


D151E510F0 


52769 


GSM231 


52769 


GSM231 


91418 


SP203Z1 51-4R9 


91418 


SP203Z 151 -4R9 



REV OCT 1981 



8-15 




Replaceable Electrical Parts— 7844/R7844 Service 



Tektronix Serial/Model No. 

Ckt No. Part No. Eff Dscont Name & Description 



C1870 


283-0003-00 


B010100 


B099999X 


C1870 


283-0003-00 


B010100 


B109999X 


C1874 


283-0635-00 


B010100 


B099999X 


C1874 


283-0635-00 


B010100 


B109999X 


Cl 884 


283-0003-00 


B010100 


B099999X 


C1884 


283-0003-00 


B010100 


B109999X 


C1890 


283-0003-00 


B010100 


B099999X 


C1890 


283-0003-00 


B010100 


B109999X 


C1892 


283-0003-00 


B010100 


B099999X 


C1892 


283-0003-00 


B010100 


B109999X 


C1898 


281-0661-00 


B010100 


B099999X 


C1898 


281-0661-00 


B010100 


B109999X 


C1904 


281-0153-00 


B010100 


B099999X 


Cl 904 


281-0153-00 


B010100 


B109999X 


C1920 


283-0003-00 


B010100 


B099999X 


C1920 


283-0003-00 


B010100 


B109999X 


C1922 


283-0003-00 


B010100 


B099999X 


C1922 


283-0003-00 


B010100 


B109999X 


C1926 


283-0003-00 


B010100 


B099999X 


C1926 


283-0003-00 


B010100 


B109999X 


C1928 


281-0661-00 


B010100 


B099999X 


C1928 


281-0661-00 


B010100 


B109999X 


C1934 


281-0153-00 


B010100 


B099999X 


Cl 9 34 


281-0153-00 


B010100 


B109999X 


Cl 976 


283-0003-00 


B010100 


B099999X 


C1976 


283-0003-00 


B010100 


B 109999X 


C1980 


283-0635-00 


B010100 


B099999X 


C1980 


283-0635-00 


BO 10100 


B109999X 



CAP. ,FXD,CER DI:0.01UF, +80-20%, 150V 
(R7844 ONLY) 

CAP. .FXD.CER DI : 0 .01UF ,+80-20% , 150V 
(7844 ONLY) 

CAP., FXD, MICA D: 51PF, 1%, 100V 
( R7844 ONLY) 

CAP., FXD, MICA D: 51PF , 1% , 100V 
(7844 ONLY) 

CAP . , FXD , CER DI : 0 . 01UF , +80-20% , 1 50V 
(R7844 ONLY) 

CAP. .FXD.CER DI-.0.01UF, +80-20%, 150V 
(7844 ONLY) 

CAP. , FXD.CER DI:0.01UF, +80-20%, 150V 
( R7844 ONLY) 

CAP. , FXD, CER DI-.0.01UF, +80-20%, 150V 
(7844 ONLY) 

CAP. , FXD, CER DI:0.01UF, +80-20%, 150V 
(R7844 ONLY) 

CAP. , FXD, CER DI:0.01UF, +80-20%, 150V 
(7844 ONLY) 

CAP. , FXD, CER DI : 0 . 8PF, +/-0 . 1PF , 500V 
(R7844 ONLY) 

CAP. , FXD, CER DI : 0 . 8PF , +/-0 . 1PF , 500V 
(7844 ONLY) 

CAP., VAR, AIR DI : 1 . 7-1 OPF , 250V 
(R7844 ONLY) 

CAP., VAR, AIR DI : 1 . 7-1 OPF , 250V 
(7844 ONLY) 

CAP. , FXD.CER DI:0.01UF, +80-20%, 150V 
( R7844 ONLY) 

CAP. .FXD.CER DI:0.01UF, +80-20%, 150V 
(7844 ONLY) 

CAP. , FXD, CER DI-.0.01UF, +80-20%, 150V 
( R7844 ONLY) 

CAP., FXD, CER DI:0.01UF, +80-20%, 150V 
(7844 ONLY) 

CAP. .FXD.CER DI:0.01UF, +80-20%, 150V 
( R7844 ONLY) 

CAP ., FXD , CER DI : 0 . 0 1UF , +80-20% , 1 50V 
(7844 ONLY) 

CAP . , FXD.CER DI : 0 . 8PF , +/-0 . 1PF , 500V 
( R7844 ONLY) 

CAP. , FXD, CER DI : 0 . 8PF , +/-0 . 1PF , 500V 
(7844 ONLY) 

CAP., VAR, AIR DI : 1 . 7-1 OPF ,250V 
(R7844 ONLY) 

CAP., VAR, AIR DI : 1 . 7-1 OPF ,250V 
(7844 ONLY) 

CAP. .FXD.CER DI:0.01UF, +80-20%, 150V 
(R7844 ONLY) 

CAP. , FXD, CER DI:0.01UF, +80-20%, 150V 
(7844 ONLY) 

CAP. , FXD, MICA D: 51PF , 1% , 100V 
( R7844 ONLY) 

CAP. , FXD, MICA D : 51PF , 1% , 100V 
(7844 ONLY) 



Mfr 

Code Mfr Part Number 



91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


00853 


D151E510F0 


00853 


D151E510F0 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


04222 


7001-1268 


04222 


7001-1268 


74970 


187-0106-005 


74970 


187-0106-005 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


04222 


7001-1268 


04222 


7001-1268 


74970 


187-0106-005 


74970 


187-0106-005 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


00853 


D151E510F0 


00853 


D151E510F0 



8-16 



REV OCT 1981, 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eft 


Dscont 


C1984 


283-0003-00 


B010100 


B099999X 


C1984 


283-0003-00 


B010100 


B109999X 


C1986 


283-0003-00 


B010100 


B099999X 


C1986 


283-0003-00 


B010100 


B109999X 


C1988 


283-0003-00 


B010100 


B099999X 


C1988 


283-0003-00 


B010100 


B109999X 


C1990 


283-0003-00 


B010100 


B099999X 


C1990 


283-0003-00 


B010100 


B109999X 


C1991 


290-0134-00 


B010100 


B099999X 


C1991 


290-0134-00 


B010100 


B109999X 


C1993 


290-0135-00 


B010100 


B010129 


C1993 


290-0145-00 


B010130 


B010135 


C1993 


290-0748-00 


B010136 


B109999X 


C1993 


290-0135-00 


B010100 


B010110 


C1993 


290-0748-00 


B010111 


B099999X 


C1995 


283-0178-00 


B010100 


B099999X 


C1995 


283-0178-00 


B010100 


B109999X 


C1997 


283-0178-00 


B010100 


B099999X 


C1997 


283-0178-00 


B010100 


B109999X 


C1999 


290-0135-00 


B010100 


B010129 


C1999 


290-0145-00 


B010130 


B010135 


C1999 


290-0748-00 


B010136 


B109999X 


C1999 


290-0135-00 


B010100 


B010110 


C1999 


290-0748-00 


B010111 


B099999X 


C2008 


283-0004-00 






C2018 


283-0004-00 






C2020 


281-0592-00 






C2022 


283-0004-00 






C2024 


283-0004-00 






C2026 


283-0004-00 






C2028 


283-0004-00 






C2032 


283-0004-00 






C2040 


283-0004-00 







Name & Description 



CAP . , FXD , CE R DI : 0 . 0 1 UF , +80-20% , 1 50V 
(R7844 ONLY) 

CAP., FXD, CER DI : 0 . 01UF, +80-20% ,150V 
(7844 ONLY) 

CAP. ,FXD,CER DI : 0 . 01UF, +80-20% ,150V 
( R7844 ONLY) 



CAP. ,FXD,CER DI:0.01UF, +80-20%, 150V 
(7844 ONLY) 

CAP. ,FXD,CER DI:0.01UF, +80-20%, 150V 
(R7844 ONLY) 

CAP. ,FXD,CER DI : 0 .01UF , +80-20% , 1 50V 
(7844 ONLY) 



CAP. ,FXD,CER DI : 0 . 01UF ,+80-20% , 150V 
(R7844 ONLY) 

CAP . , FXD , CER DI : 0 . 01UF , +80-20% , 1 50V 
(7844 ONLY) 

CAP . , FXD , ELCTLT : 22UF , 20% , 1 5V 
(R7844 ONLY) 



CAP . , FXD , ELCTLT : 22UF , 20% , 15V 
(7844 ONLY) 

CAP. , FXD, ELCTLT : 15UF, 20%, 20V 
(7844 ONLY) 

CAP . , FXD .ELCTLT : 1 OUF , +75-10% , 50V 
(7844 ONLY) 



CAP . , FXD , ELCTLT : 10UF , +50-10% , 20V 
(7844 ONLY) 

CAP . , FXD , ELCTLT : 1 5UF , 20% , 20V 
(R7844 ONLY) 

CAP . , FXD , ELCTLT : 1 OUF , +50-1 0% , 20V 
(R7844 ONLY) 

CAP. , FXD, CER DI:0.1UF, +80-20%, 100V 
(R7844 ONLY) 

CAP. , FXD, CER DI:0.1UF, +80-20%, 100V 
(7844 ONLY) 

CAP. , FXD, CER DI-.0.1UF, +80-20%, 100V 
(R7844 ONLY) 



CAP. , FXD, CER DH0.1UF, +80-20%, 100V 
(7844 ONLY) 

CAP . , FXD , ELCTLT : 1 5UF , 20% , 20V 
(7844 ONLY) 

CAP., FXD, ELCTLT: 10UF, +75-10%, 50V 
(7844 ONLY) 



CAP. , FXD, ELCTLT: 10UF, +50-10%, 20V 
(7844 ONLY) 

CAP . , FXD , ELCTLT : 1 5UF , 20% , 20V 
(R7844 ONLY) 

CAP . , FXD , ELCTLT : 1 OUF , + 50-1 0% , 20 V 
( R7844 ONLY) 

CAP . , FXD , CER DI : 0 . 02UF , +80-20% , 1 50V 
CAP. , FXD, CER DI:0.02UF, +80-20%, 150V 
CAP. , FXD, CER DI :4. 7PF ,+/-0 . 5PF , 500V 
CAP. , FXD, CER DI :0.02UF, +80-20%, 150V 
CAP . , FXD , CER DI : 0 . 02UF , +80-20% , 1 50V 
CAP . , FXD ,CER DI : 0 . 02UF , +80-20% , 1 50V 

CAP . , FXD , CER DI : 0 . 02UF , +80-20% , 1 50V 
CAP . , FXD , CER DI : 0 . 02UF , +80-20% , 1 50V 
CAP . , FXD , CER DI : 0 . 02UF , +80-20% , 1 50V 



Mfr 

Code 


Mfr Part Number 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


56289 


150D226X0015B2 


56289 


150D226X0015B2 


56289 


1 50D1 56X0020B2 


56289 


30D106G050CB9 


56289 


500D149 


56289 


150D156X0020B2 


56289 


500D149 


72982 


8131N145651 104Z 


72982 


8131N145651 104Z 


72982 


8131N145651 104Z 


72982 


81 31N145651 104Z 


56289 


150D156X0020B2 


56289 


30D106G050CB9 


56289 


500D149 


56289 


150D156X0020B2 


56289 


500D149 


91418 

91418 

59660 

91418 

91418 

91418 


SP203Z151-4R9 

SP203Z151-4R9 

301-023C0H0479D 

SP203Z1 51-4R9 

SP203Z151-4R9 

SP203Z151-4R9 


91418 

91418 

91418 


SP203Z151-4R9 
SP203Z151-4R9 
SP203Z1 51-4R9 



REV OCT 1981 



8-17 




Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eff Dscont 




Name & Description 


Mfr 

Code 


Mfr Part Number 


C2044 


283-0004-00 


B010100 


B139999 


CAP. 


, FXD ,CER DI : 0 . 02UF ,+80-20% , 150V 


91418 


SP203Z151-4R9 


C2044 


283-0414-00 


B140000 




CAP. 


, FXD , CER DI : 0 . 022UF , 20% , 500V 


51642 


300-500X7R223M 


C2050 


283-0004-00 


B010100 


B139999 


CAP. 


, FXD, CER DI:0.02UF, +80-202, 150V 


91418 


SP203Z151-4R9 


C2050 


283-0414-00 


B140000 




CAP. 


, FXD, CER DI:0.022UF, 202, 500V 


51642 


300-500X7R223M 


C2062 


281-0661-00 






CAP. 


, FXD, CER DI:0. 8PF ,+/-0 . 1PF, 500V 


04222 


7001-1268 


C2064 


281-0546-00 






CAP. 


, FXD, CER DI.-330PF, 102, 500V 


04222 


7001-1380 


C2068 


281-0153-00 






CAP. 


, VAR, AIR DI : 1 . 7-10PF ,250V 


74970 


187-0106-005 


C2072 


281-0168-00 






CAP. 


, VAR, AIR DI : 1 . 3-5 -4PF , 250V 


74970 


187-0103-035 


C2086 


281-0627-00 






CAP. 


, FXD, CER DI : 1PF ,+/-0 . 25PF , 500V 


04222 


7001-1340 


C2090 


283-0004-00 


B010100 


B139999 


CAP. 


, FXD, CER DI:0.02UF, +80-202, 150V 


91418 


SP203Z151-4R9 


C2090 


283-0414-00 


B140000 




CAP. 


, FXD, CER DI : 0 . 022UF , 20% , 500V 


51642 


300-500X7R223M 


C2092 


283-0177-00 






CAP. 


, FXD, CER DI:1UF, +80-202, 25V 


56289 


273C5 


C2094 


283-0177-00 






CAP. 


, FXD, CER DI:1UF, +80-202, 25V 


56289 


273C5 


C2096 


283-0177-00 






CAP. 


, FXD ,CER DltlUF, +80-20%, 25V 


56289 


273C5 


C2098 


283-0004-00 






CAP. 


, FXD, CER DI:0.02UF, +80-20%, 150V 


91418 


SP203Z1 51-4R9 


C2101 


283-0004-00 






CAP 


, FXD, CER DI:0.02UF, +80-20%, 150V 


91418 


SP203Z1 51-4R9 


C2109 


283-0003-00 






CAP 


, FXD, CER DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C2112 


283-0077-00 






CAP. 


, FXD, CER DI : 330PF, 5% , 500V 


59660 


83.1-500B331J 


C2115 


290-0534-00 






CAP. 


, FXD , ELCTLT : 1UF , 20% , 35V 


56289 


1 96D105X0035HA1 


C2117 


290-0534-00 






CAP. 


, FXD ,ELCTLT : 1UF , 20% , 35V 


56289 


1 96D105X0035HA1 


C2119 


290-0534-00 






CAP. 


, FXD , ELCTLT : 1UF , 20% , 35V 


56289 


196D105X0035HA1 


C2121 


283-0594-00 






CAP. 


, FXD, MICA D:0.001UF, 1%, 100V 


00853 


D151F102F0 


C2135 


285-0698-00 






CAP. 


, FXD , PLSTC : 0 . 0082UF , 52 , 100V 


56289 


410P82251 


C2140 


283-0103-00 






CAP. 


, FXD, CER DI : 180PF, 52 , 500V 


59660 


831-518-Z5D0181 J 


C2144 


281-0544-00 






CAP. 


, FXD, CER DI : 5 . 6PF , 10% , 500V 


59660 


301-0OOC0H0569D 


C2145 


290-0534-00 






CAP. 


, FXD , ELCTLT : 1UF , 20% , 35V 


56289 


196D105X0035HA1 


C2155 


283-0103-00 






CAP. 


, FXD, CER DI : 180PF, 5% , 500V 


59660 


831-518-Z5D0181 J 


C2183 


283-0032-00 






CAP. 


, FXD, CER DI : 470PF, 5% , 500V 


72982 


0831085Z5E00471 J 


C2185 


283-0004-00 






CAP. 


, FXD, CER DI:0.02UF, +80-20%, 150V 


91418 


SP203Z151-4R9 


C2214 


283-0032-00 






CAP. 


, FXD, CER DI :470PF, 52 , 500V 


72982 


0831085Z5E00471 J 


C2242 


283-0000-00 






CAP. 


, FXD, CER DI:0.001UF, +100-02, 500V 


59660 


831-519-Z5U-102P 


C2244 


283-0004-00 






CAP. 


, FXD, CER DI:0.02UF, +80-20%, 150V 


91418 


SP203Z151-4R9 


C2255 


283-0000-00 






CAP. 


, FXD , CER DI : 0 . 001UF , +100-0% , 500V 


59660 


831-519-Z5U-102P 


C2281 


283-0054-00 


XB0101 10 




CAP. 


, FXD, CER DI : 150PF , 52,200V 


59660 


855-535U2J151J 


C2302 


283-0011-00 






CAP. 


, FXD, CER DI:0.01UF, 2000V 


72982 


3902BW41 1Z5U103Z 


C2304 


283-0271-00 






CAP. 


, FXD, CER DI.-0.001UF, 202, 4000V 


56289 


33C325 


C2306 


283-0272-00 






CAP. 


, FXD, CER DI-.0.0068UF, 30%, 4000V 


72982 


3888-510C 682M 


C2307 


283-0006-00 






CAP. 


, FXD, CER DI:0.02UF, +80-20%, 500V 


72982 


0841545Z5V00203Z 


C2308 


283-0272-00 






CAP. 


, FXD, CER DI:0.0068UF, 30%, 4000V 


72982 


3888-5 IOC 682M 


C231 1 


283-0105-00 






CAP. 


, FXD, CER DI:0.01UF, +80-202, 2000V 


56289 


4 1 C 3 1 6 


C2312 


283-0272-00 






CAP. 


, FXD, CER DI:0.0068UF, 302, 4000V 


72982 


3888-510C 682M 


C2322 


283-0092-00 






CAP. 


, FXD, CER DI:0.03UF, +80-20%, 200V 


72982 


845-534E303Z 


C2323 


283-0271-00 






CAP. 


, FXD, CER DI:0.001UF, 20%, 4000V 


56289 


33C325 


C2324 


283-0271-00 






CAP. 


, FXD, CER DI:0.001UF, 20%, 4000V 


56289 


33C325 


C2332 


283-0092-00 






CAP. 


, FXD, CER DI:0.03UF, +80-20%, 200V 


72982 


845-534E303Z 


C2333 


283-0271-00 






CAP. 


, FXD, CER DI.-0.001UF, 20%, 4000V 


56289 


33C325 


C2334 


283-0271-00 






CAP. 


, FXD, CER DI : 0.00 1UF, 20%, 4000V 


56289 


33C325 


C2342 


283-0279-00 






CAP. 


, FXD, CER DI:0.001UF, 202, 3000V 


56289 


55C153 


C2343 


283-0279-00 






CAP. 


, FXD, CER DI:0.001UF, 20%, 3000V 


56289 


55C153 


C2346 


283-0279-00 






CAP. 


, FXD, CER DI:0.001UF, 20%, 3000V 


56289 


55C153 


C2351 


283-0092-00 






CAP. 


, FXD, CER DI:0.03UF, +80-20%, 200V 


72982 


845-534E303Z 


C2352 


283-0279-00 






CAP. 


, FXD, CER DI.-0.001UF, 20%, 3000V 


56289 


55C153 


C2353 


283-0279-00 






CAP. 


, FXD, CER DI:0.001UF, 20%, 3000V 


56289 


55C153 


C2356 


283-0279-00 






CAP. 


, FXD, CER DI :0. 001 UF, 202, 3000V 


56289 


55053 


C2400 


283-0104-00 






CAP. 


, FXD, CER DI : 2000PF , 5% , 500V 


72982 


81 1-565B202J 


C2402 


283-0104-00 






CAP 


, FXD, CER DI : 2000PF , 5% , 500V 


72982 


81 1-565B202J 


C2404 


283-0271-00 






CAP 


, FXD, CER DI:0.001UF, 20%, 4000V 


56289 


33C325 



8-18 



REV OCT 1981 



Replaceable Electrical Parts — 7844 /R 7844 Service 



Tektronix Serial/Model No. Mfr 

Ckt No. Part No. Eft Dscont Name & Description Code Mfr Part Number 



C2407 


283-0271-00 






CAP. 


,FXD,CER 


DI : 0 . 001UF , 20% ,4000V 


56289 


33C325 


C2408 


283-0272-00 






CAP. 


, FXD, CER 


D1 : 0 . 0068UF , 30% , 4000V 


72982 


3888-510C 682M 


C2409 


283-0272-00 






CAP. 


, FXD , CER 


DI:0.0068UF, 30%, 4000V 


72982 


3888-510C 682M 


C2445 


283-0279-00 






CAP. 


, FXD, CER 


DI:0.001UF, 20%, 3000V 


56289 


55C153 


C2449 


283-0110-00 






CAP. 


, FXD, CER 


DI:0.005UF, +80-20%, 150V 


56289 


19C242B 


C2452 


283-0110-00 






CAP. 


, FXD, CER 


DI:0.005UF, +80-20%, 150V 


56289 


19C242B 


C2461 


283-0003-00 






CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C2475 


283-0279-00 






CAP. 


, FXD, CER 


DIrO.OOlUF, 20%, 3000V 


56289 


55C153 


C2479 


283-0110-00 






CAP. 


, FXD, CER 


DI : 0 . 005UF , +80-20% , 1 50V 


56289 


19C242B 


C2482 


283-0110-00 






CAP. 


, FXD, CER 


DI:0.005UF, +80-20%, 150V 


56289 


19C242B 


C2491 


283-0003-00 






CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z1 51-4R9 


C2508 


290-0534-00 






CAP. 


, FXD , ELCTLT : 1UF , 207, , 35 V 


56289 


1 96D 1 05X003 5HA1 


C2511 


290-0536-00 






CAP. 


, FXD , ELCTLT : 10UF , 20% , 25V 


90201 


TDC106M025FL 


C2552 


283-0003-00 






CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C2556 


283-0003-00 






CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C2560 


283-0003-00 






CAP. 


, FXD, CER 


DI : 0 . 0 1 UF , +80-20% , 1 50V 


91418 


SP103Z151-4R9 


C2564 


283-0003-00 






CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z1 51 -4R9 


C2568 


283-0003-00 






CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C2572 


283-0003-00 






CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C2576 


283-0003-00 






CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C2578 


283-0003-00 






CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z 1 5 1-4R9 


C2582 


283-0003-00 


B010100 


B139999 


CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C2582 


283-0068-00 


8140000 




CAP. 


, FXD, CER 


DI:0.01UF, +100-0%, 500V 


56289 


19C241 


C2583 


283-0003-00 


B010100 


B139999 


CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C2583 


283-0068-00 


B140000 




CAP. 


, FXD, CER 


DI:0.01UF, +100-0%, 500V 


56289 


19C241 


C2585 


283-0003-00 






CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C2586 


283-0003-00 






CAP. 


, FXD, CER 


DI.-0.01UF, +80-20%, 150V 


91418 


SP103Z1 51-4R9 


C2588 


283-0003-00 






CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C2589 


283-0003-00 






CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C2591 


283-0003-00 






CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z1 51 -4R9 


C2592 


283-0003-00 






CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C2594 


283-0003-00 






CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C2595 


283-0003-00 






CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C2597 


283-0003-00 






CAP. 


, FXD, CER 


DI:0.01UF, +80-20%, 150V 


91418 


SP103Z151-4R9 


C2657 


283-0185-00 






CAP. 


, FXD, CER 


DI : 2 . 5PF , 5% , 50V 


72982 


8101B057C0K0295B 


C2658 


281-0151-00 






CAP. 


, VAR, CER 


DI : 1-3PF, 100V 


72982 


518-600A1-3 


C2659 


283-0185-00 






CAP. 


, FXD, CER 


DI : 2 . 5PF , 5% , 50V 


72982 


8101B057C0K0295B 


C2662 


281-0603-00 






CAP. 


, FXD, CER 


DI : 39PF , 5% , 500V 


59660 


3O8-OOOCOG039OJ 


C2663 


281-0603-00 






CAP. 


, FXD, CER 


DI : 39PF , 5% , 500V 


59660 


3O8-OOOCOG0390J 


C2670 


281-0543-00 






CAP. 


, FXD, CER 


DI : 270PF ,10%, 500V 


72982 


301055X5P271K 


C2672 


281-0543-00 






CAP. 


, FXD, CER 


DI : 270PF , 10% , 500V 


72982 


301055X5P271K 


C2675 


283-0160-00 






CAP. 


, FXD, CER 


DI : 1 . 5PF, 10%, 50V 


72982 


8101 A058C0K1 59B 


C2676 


283-0181-00 






CAP. 


, FXD, CER 


DI : 1 . 8PF , 10% , 100V 


72982 


8101B121C0K0189B 


C2680 


283-0181-00 






CAP. 


, FXD, CER 


DI : 1 . 8PF ,10%, 100V 


72982 


8101B121C0K0189B 


C2681 


283-0160-00 






CAP. 


, FXD, CER 


DI : 1 . 5PF , 10% , 50V 


72982 


8101 A058C0K1 59B 


C2685 


281-0543-00 






CAP. 


, FXD, CER 


DI : 270PF , 10% , 500V 


72982 


301055X5P271K 


C2689 


281-0543-00 






CAP. 


, FXD, CER 


DI:270PF,10%,500V 


72982 


301055X5P271K 


C2692 


283-0065-00 






CAP. 


, FXD, CER 


DI : 0. 001UF , 5% , 100 V 


72982 


805-518-Z5D0102J 


C2734 


283-0181-00 






CAP. 


, FXD, CER 


DI:1.8PF,10%,100V 


72982 


8101B121COK0189B 


C2736 


283-0185-00 






CAP. 


, FXD, CER 


DI : 2 . 5PF , 5% , 50V 


72982 


8101B057C0K0295B 










(NOMINAL VALUE , SELECTED) 






C2738 


283-0181-00 






CAP. 


, FXD, CER 


DI : 1 . 8PF , 10% , 1 00V 


72982 


8101 B12 1C0K01 89B 


C2739 


283-0160-00 






CAP. 


, FXD, CER 


DI : 1 . 5PF ,10%, 50V 


72982 


8101A058C0K1 59B 


C2743 


283-0128-00 






CAP. 


, FXD, CER 


DI : 100PF , 5% , 500V 


72982 


871-536T2H101 J 


C2745 


283-0114-00 






CAP. 


, FXD, CER 


DI : 0.001 5UF, 5%, 200V 


72982 


805-509B152J 


C2747 


283-0239-00 






CAP. 


, FXD, CER 


DI :0.022UF, 10% , 50V 


72982 


8121 N083X7R022 3K 


C2749 


283-0203-00 






CAP. 


, FXD, CER 


DI : 0 .47UF , 20% , 50V 


72982 


81 31N075E474M 



REV OCT 1981 



8-19 



Replaceable Electrical Parts — 7844 /R 7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eff 


Dscont 


C2753 


283-0160-00 






C2758 


283-0108-00 






C2760 


283-0180-00 






C2762 


283-0211-00 






C2764 


283-0212-00 






C2770 


283-0001-00 






C2783 


283-0001-00 






C2787 


283-0001-00 






C2789 


283-0001-00 






C2791 


283-0001-00 






C2794 


283-0001-00 






C2796 


283-0001-00 






C2798 


283-0001-00 






C2820 


283-0000-00 


B010100 


B099999X 


C2820 


283-0000-00 


B010100 


B109999X 


C2822 


283-0000-00 


BO 10100 


B099999X 


C2822 


283-0000-00 


B010100 


B109999X 


C2826 


281-0511-00 


B010100 


B099999X 


C2826 


281-0511-00 


B010100 


B109999X 


C2831 


281-0509-00 


XB030190 


B109999X 


C2831 


281-0509-00 


XB020123 


B099999X 


C2842 


281-0504-00 


B010100 


B099999X 


C2842 


281-0504-00 


B010100 


B109999X 


C2844 


281-0557-00 


B010100 


B099999X 


C2844 


281-0557-00 


B010100 


B109999X 


C2852 


281-0504-00 


B010100 


B099999X 


C2852 


281-0504-00 


B010100 


B109999X 


C2854 


281-0557-00 


B010100 


B099999X 


C2854 


281-0557-00 


B010100 


B109999X 


C2860 


283-0635-00 


B010100 


B099999X 


C2860 


283-0635-00 


B010100 


B109999X 


C2862 


281-0118-00 


B010100 


B099999X 


C2862 


281-0118-00 


BO 10 100 


B109999X 


C2867 


283-0004-00 


8010100 


B099999X 


C2867 


283-0004-00 


B010100 


B109999X 



Name & Description 



CAP . , FXD , CER DI : 1 . 5PF , 10% , 50V 
CAP.,FXD,CER DI : 220PF , 10% ,200V 
(NOMINAL VALUE .SELECTED) 

CAP..FXD.CER DI : 5600PF , 20% , 200V 
CAP . ,FXD , CER DI : 0 . 1UF, 10% , 200V 
CAP . ,FXD , CER DI : 2UF , 20% , 50V 

CAP. .FXD.CER DI : 0 . 005UF , +100-0% , 500V 
CAP . , FXD , CER DI : 0 . 005UF ,+100-0% , 500V 
CAP . , FXD , CER DI : 0 . 005UF ,+100-0%, 500V 
CAP. , FXD, CER DI:0.005UF, +100-0%, 500V 
CAP . , FXD , CER DI : 0 . 005UF , + 1 00-0% , 500V 
CAP . .FXD.CER DI : 0 . 005UF , +100-0% , 500V 

CAP . , FXD , CER DI : 0 . 005UF , + 1 00-0% , 500V 
CAP. .FXD.CER DI:0.005UF, +100-0%, 500V 
CAP. , FXD, CER DI:0.001UF, +100-0%, 500V 
(R7844 ONLY) 

CAP. .FXD.CER DI:0.001UF, +100-0%, 500V 
(7844 ONLY) 

CAP. , FXD, CER DI;0.001UF, +100-0%, 500V 
(R7844 ONLY) 

CAP. , FXD, CER DI:0.001UF, +100-0%, 500V 
(7844 ONLY) 

CAP. ,FXD,CER DI : 22PF , +/-2 . 2PF , 500V 
(R7844 ONLY) 

CAP. , FXD, CER DI : 22PF , +/-2 . 2PF , 500V 
(7844 ONLY) 

CAP. , FXD, CER DI : 15PF,+/-1 . 5PF.500V 
(7844 ONLY) 

CAP. , FXD, CER DI : 15PF.+/-1 . 5PF , 500V 
(R7844 ONLY) 

CAP., FXD, CER DI : 10PF .+/-1PF , 500V 
( R7844 ONLY) 

CAP., FXD, CER DI:10PF,+/-1PF, 500V 
(7844 ONLY) 

CAP., FXD, CER DI : 1 . 8PF , 10% , 500V 
( R7844 ONLY) 

CAP. .FXD.CER DI : 1 . 8PF , 10% , 500V 
(7844 ONLY) 

CAP., FXD, CER DI : 10PF, +/-1PF , 500V 
(R7844 ONLY) 

CAP., FXD, CER DI : 10PF , +/-1PF , 500V 
(7844 ONLY) 

CAP., FXD, CER DI : 1 . 8PF , 10% , 500V 
(R7844 ONLY) 

CAP., FXD, CER DI : 1 . 8PF, 10% , 500V 
(7844 ONLY) 

CAP., FXD, MICA D: 51PF , 1% , 100V 
( R7844 ONLY) 

CAP. , FXD, MICA D: 51PF , 1% , 100V 
(7844 ONLY) 

CAP. , VAR, MICA D:8-90PF, 175V 
( R7844 ONLY) 

CAP. , VAR, MICA D: 8-90PF, 175V 
(7844 ONLY) 

CAP. , FXD.CER DI:0.02UF, +80-20%, 150V 
(R7844 ONLY) 

CAP. , FXD, CER DI:0.02UF, +80-20%, 150V 
(7844 ONLY) 



Mfr 

Code 


Mfr Part Number 


72982 

56289 


8101A058C0K1 59B 
272C13 


72982 

72982 

72982 


8121N204 E 562M 

8141N210X7R0104K 

8141N064Z5U205M 


72982 

72982 

72982 

72982 

72982 

72982 


831-559E502P 

831-559E502P 

831-559E502P 

831-559E502P 

831-559E502P 

831-559E502P 


72982 

72982 

59660 


831-559E502P 

831-559E502P 

831-519-Z5U-102P 


59660 


831-519-Z5U-102P 


59660 


831-519-Z5U-102P 


59660 


831-519-Z5U-102P 


59660 


301-000C0G0220K 


59660 


301-000C0G0220K 


59660 


3O1-OOOC0G015OK 


59660 


301-0O0C0GO150K 


59660 


301-055COG0100F 


59660 


301-055C0G0100F 


04222 


7001-1324 


04222 


7001-1324 


59660 


301-055C0G0100F 


59660 


301-055COG0100F 


04222 


7001-1324 


04222 


7001-1324 


00853 


D151E510F0 


00853 


D151E510F0 


52769 


GSM231 


52769 


GSM231 


91418 


SP203Z151-4R9 


91418 


SP203Z151-4R9 



8-20 



REV OCT 1981, 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 

Ckt No. Part No. Eff Dscont Name & Description 



C2870 


283-0003-00 


B010100 


B099999X 


C2870 


283-0003-00 


B010100 


B109999X 


C2874 


283-0635-00 


B010100 


B099999X 


C2874 


283-0635-00 


B010100 


B109999X 


C2884 


283-0003-00 


B010100 


B099999X 


C2884 


283-0003-00 


B010100 


B109999X 


C2890 


283-0003-00 


B010100 


B099999X 


C2890 


283-0003-00 


BO 101 00 


B109999X 


C2892 


283-0003-00 


B010100 


B099999X 


C2892 


283-0003-00 


B010100 


B109999X 


C2898 


281-0661-00 


B010100 


B099999X 


C2898 


281-0661-00 


B010100 


B109999X 


C2904 


281-0153-00 


B010100 


B099999X 


C2904 


281-0153-00 


B010100 


B109999X 


C2920 


283-0003-00 


B010100 


B099999X 


C2920 


283-0003-00 


B010100 


B109999X 


C2922 


283-0003-00 


B010100 


B099999X 


C2922 


283-0003-00 


B010100 


B109999X 


C2926 


283-0003-00 


B010100 


B099999X 


C2926 


283-0003-00 


B010100 


B109999X 


C2928 


281-0661-00 


B010100 


B099999X 


C2928 


281-0661-00 


B010100 


B109999X 


C2934 


281-0153-00 


B010100 


B099999X 


C2934 


281-0153-00 


B010100 


B109999X 


C2974 


283-0003-00 


B010100 


B099999X 


C2974 


283-0003-00 


B010100 


B109999X 


C2976 


283-0003-00 


B010100 


B099999X 


C2976 


283-0003-00 


B010100 


B109999X 



CAP. ,FXD,CER D1:0.01UF, +80-20%, 150V 
(R7844 ONLY) 

CAP. .FXD.CER DI:0.01UF, +80-20%, 150V 
(7844 ONLY) 

CAP. ,FXD, MICA D: 51PF , 1% , 100V 
(R7844 ONLY) 

CAP. ,FXD, MICA D: 51PF, 1%, 100V 
(7844 ONLY) 

CAP. .FXD.CER DI : 0 . 01UF ,+80-20% , 1 50V 
(R7844 ONLY) 

CAP. , FXD.CER DI:0.01UF, +80-20%, 150V 
(7844 ONLY) 

CAP. .FXD.CER DI:0.01UF, +80-20%, 150V 
( R7844 ONLY) 

CAP. .FXD.CER DI : 0 . OlUF, +80-20% ,150V 
(7844 ONLY) 

CAP. .FXD.CER DI:0. OlUF, +80-20%, 150V 
(R7844 ONLY) 

CAP. .FXD.CER DI:0. OlUF, +80-20%, 150V 
(7844 ONLY) 

CAP. .FXD.CER DI : 0 . 8PF , +/-0 . 1PF , 500V 
(R7844 ONLY) 

CAP ..FXD.CER DI : 0 . 8PF , +/-0 . 1PF , 500V 
(7844 ONLY) 

CAP., VAR, AIR DI : 1 . 7-1 OPF , 250V 
(R7844 ONLY) 

CAP., VAR, AIR DI : 1 . 7-10PF, 250V 
(7844 ONLY) 

CAP. .FXD.CER DI:0. OlUF, +80-20%, 150V 
(R7844 ONLY) 

CAP. .FXD.CER DI:0. OlUF, +80-20%, 150V 
(7844 ONLY) 

CAP., FXD.CER DI:0. OlUF, +80-20%, 150V 
(R7844 ONLY) 

CAP. .FXD.CER DI:0. OlUF, +80-20%, 150V 
(7844 ONLY) 

CAP. .FXD.CER DI:0. OlUF, +80-20%, 150V 
( R7844 ONLY) 

CAP. .FXD.CER DI:0. OlUF, +80-20%, 150V 
(7844 ONLY) 

CAP. .FXD.CER DI :0.8PF,+/-0. 1PF.500V 
( R7844 ONLY) 

CAP. .FXD.CER DI : 0 . 8PF, +/-0 . 1PF, 500V 
(7844 ONLY) 

CAP., VAR, AIR DI : 1 . 7-1 OPF ,250V 
(R7844 ONLY) 

CAP., VAR, AIR DI : 1 . 7-1 OPF , 250V 
(7844 ONLY) 

CAP. .FXD.CER DI:0. OlUF, +80-20%, 150V 
( R7844 ONLY) 

CAP. , FXD.CER DI:0. OlUF, +80-20%, 150V 
(7844 ONLY) 

CAP . , FXD , CER DI : 0 . 0 1 UF , +80-20% , 1 50V 
( R7844 ONLY) 

CAP. .FXD.CER DI:0. OlUF, +80-20%, 150V 
(7844 ONLY) 



Mfr 

Code 


Mfr Part Number 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


00853 


D151E510F0 


00853 


D151E510F0 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


04222 


7001-1268 


04222 


7001-1268 


74970 


187-0106-005 


74970 


187-0106-005 


91418 


SP103Z151-4R9 


91418 


SP103Z1 51-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


04222 


7001-1268 


04222 


7001-1268 


74970 


187-0106-005 


74970 


187-0106-005 


91418 


SP103Z1 51-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 


91418 


SP103Z151-4R9 



REV OCT 1981 



8-21 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No, 



Ckt No. 


Part No, 


Eff 


Dscont 


C2980 


283-0635-00 


B010100 


B099999X 


C2980 


283-0635-00 


B010100 


B109999X 


C2984 


283-0003-00 


B010100 


B099999X 


C2984 


283-0003-00 


B010100 


B109999X 


C2986 


283-0003-00 


B010100 


B099999X 


C2986 


283-0003-00 


B010100 


B109999X 


C2988 


283-0003-00 


B010100 


B099999X 


C2988 


283-0003-00 


BO 10100 


B109999X 


C2990 


283-0003-00 


BO 10100 


B099999X 


C2990 


283-0003-00 


B010100 


B109999X 


C2991 


290-0134-00 


B010100 


B099999X 


C2991 


290-0134-00 


B010100 


B109999X 


C2993 


290-0135-00 


B010100 


B010129 


C2993 


290-0145-00 


B010130 


BO 101 35 


C2993 


290-0748-00 


B010100 


B109999X 


C2993 


290-0135-00 


B010100 


B010110 


C2993 


290-0748-00 


B010111 


B099999X 


C2995 


283-0178-00 


B010100 


B099999X 


C2995 


283-0178-00 


B010100 


B109999X 


C2997 


283-0178-00 


B010100 


B099999X 


C2997 


283-0178-00 


B010100 


B109999X 


C2999 


290-0135-00 


B010100 


B010129 


C2999 


290-0145-00 


B010130 


B010135 


C2999 


290-0748-00 


B010136 


B109999X 


C2999 


290-0135-00 


B010100 


B010110 


C2999 


290-0748-00 


B010111 


B099999X 


C3601 


283-0158-00 






C3605 


283-0251-00 






C3611 


283-0158-00 







Name & Description 



CAP. ,FXD, MICA D: 51PF , 1% , 100V 
(R7844 ONLY) 

CAP. ,FXD, MICA D: 51PF, 1%, 100V 
(7844 ONLY) 

CAP. , FXD, CER DI : 0 . 01UF ,+80-205! , 150V 
(R7844 ONLY) 

CAP. ,FXD,CER DI : 0 . OltJF ,+80-20% , 150V 
(7844 ONLY) 

CAP. ,FXD,CER DI : 0. 01UF , +80-20% , 150V 
(R7844 ONLY) 

CAP. ,FXD,CER DI : 0 . 01UF, +80-20% ,150V 
(7844 ONLY) 



CAP. ,FXD,CER DI : 0 . 01UF , +80-20% , 150V 
(R7844 ONLY) 

CAP . , FXD ,CER DI : 0 . 01UF , +80-20% , 1 50V 
(7844 ONLY) 

CAP. ,FXD,CER DI : 0. 01UF, +80-20% ,150V 
(R7844 ONLY) 



CAP. ,FXD,CER DI : 0 . 01UF ,+80-20% , 150V 
(7844 ONLY) 

CAP. , FXD ,ELCTLT : 22UF , 20% , 15V 
(R7844 ONLY) 

CAP . , FXD , ELCTLT : 22UF , 20% , 1 5V 
(7844 ONLY) 

CAP . , FXD , ELCTLT : 15UF, 20% , 20V 
(7844 ONLY) 

CAP. , FXD, ELCTLT: 10UF, +75-10%, 50V 
(7844 ONLY) 

CAP . , FXD , ELCTLT : 10UF , +50-10% , 20V 
(7844 ONLY) 

CAP . , FXD .ELCTLT : 15UF , 20% , 20V 
(R7844 ONLY) 

CAP . , FXD , E LCTLT :10UF, + 50-10%,20V 
( R7844 ONLY) 

CAP. ,FXD,CER DI:0.1UF, +80-20%, 100V 
(R7844 ONLY) 

CAP . , FXD , CER DI : 0 . 1 UF , +80-20% , 100V 
(7844 ONLY) 

CAP . , FXD , CER DI : 0 . 1UF , +80-20% , 1 00V 
(R7844 ONLY) 

CAP . , FXD , CER DI : 0 . 1UF , +80-20% , 100V 
(7844 ONLY) 

CAP. , FXD, ELCTLT: 15UF, 20%, 20V 
(7844 ONLY) 

CAP . , FXD , ELCTLT : 1 OUF , +7 5- 1 0% , 50V 
(7844 ONLY) 

CAP . , FXD .ELCTLT : 10UF , +50-10% , 20V 
(7844 ONLY) 

CAP ., FXD , ELCTLT : 1 5UF , 20% , 20V 
( R7844 ONLY) 

CAP. , FXD, ELCTLT: 10UF, +50-10%, 20V 
( R7844 ONLY) 

CAP., FXD, CER DI : 1PF , 10% , 50V 
(C3601 , 7844/R7844 ONLY) 

CAP., FXD, CER DI : 87 PF,5%,100V 
(C3605, 7844/R7844 ONLY) 

CAP., FXD, CER DI : 1PF , 10% , 50V 
(C3611, 7844/R7844 ONLY) 



Mfr 

Code 

00853 

00853 

91418 

91418 

91418 

91418 

91418 

91418 

91418 

91418 

56289 

56289 

56289 

56289 

56289 

56289 

56289 

72982 

72982 

72982 

72982 

56289 

56289 

56289 

56289 

56289 

72982 

72982 

72982 



Mfr Part Number 

DI 51E510F0 
D151E510F0 
SP103Z151-4R9 

SP103Z151-4R9 

SP103Z151-4R9 

SP103Z151-4R9 

SP103Z151-4R9 

SP103Z151-4R9 

SP103Z151-4R9 

SP103Z151-4R9 
150D226X0015B2 
1 50D226X001 5B2 

150D156X0020B2 

30D106G050CB9 

500D149 

150D156X0020B2 

500D149 

8131N145651 104Z 

8131N145651 104Z 
8131N145651 104Z 
8 1 3 1 N 14565 1 104Z 

150D156X0020B2 

30D106G050CB9 

500D149 

1 50D1 56X0020B2 
500D149 

8101B057C0K0109B 

8121B145C0G0870J 

8101B057COK0109B 



8-22 



REV OCT 1981 . 




Replaceable Electrical Parts— 7844/R7844 Service 



Tektronix Serial/Model No. 

Ckt No. Part No. Eff Dscont Name & Description 



Mfr 

Code Mfr Part Number 



C3615 


283-0158-00 




C3616 


283-0108-00 




C3617 


283-0158-00 




C3618 


283-0158-00 


XB010149 


C3620 


283-0260-00 


B010100 B049999 



C3620 


281-0122-00 


B050000 




C3620 


283-0260-00 


B010100 


B039999 


C3620 


281-0122-00 


B040000 




C3621 


283-0180-00 






C3622 


283-0191-00 


B010100 


B049999 


C3622 


283-0239-00 


B050000 




C3622 


283-0191-00 


B010100 


B039999 


C3622 


283-0239-00 


B040000 




C3630 


283-0180-00 






C3634 


283-0204-00 






C3638 


283-0158-00 






C3639 


283-0158-00 






C3660 


283-0158-00 






C3661 


283-0108-00 






C3662 


283-0158-00 






C3663 


283-0158-00 


XB010149 




C3665 


283-0260-00 


B010100 


B049999 



C3665 


281-0122-00 


B050000 


C3665 


283-0260-00 


B010100 B039999 


C3665 


281-0122-00 


B040000 



CAP.,FXD,CER DI:1PF,10X,50V 
(C3615, 7844/R7844 ONLY) 

CAP.,FXD,CER DI : 220PF , 10% , 200V 
(C3616 , 7844/R7844 ONLY) 

(NOMINAL VALUE, SELECTED) 

CAP. , FXD, CER DI : 1PF, 10% , 50V 
(C3617, 7844/R7844 ONLY) 

CAP., FXD, CER DI : 1PF , 10% , 50V 
( C3618 , 7844/R7844 ONLY. NOMINAL VALUE, 
SELECTED AND ADDED IF NECESSARY) 

CAP., FXD, CER DI : 5 . 6PF , 5% , 200V 
(7844 ONLY) 

(NOMINAL VALUE, SELECTED) 

CAP., VAR, CER DI : 2 . 5-9PF, 100V 
(7844 ONLY) 

CAP., FXD, CER DI : 5 . 6PF , 5% , 200V 
( R7844 ONLY) 

(NOMINAL VALUE, SELECTED) 

CAP., VAR, CER DI : 2 . 5-9PF , 100V 
( R7844 ONLY) 

CAP., FXD, CER DI : 5600PF , 20% , 200V 
(C3621 , 7844/R7844 ONLY) 

CAP., FXD, CER DI : 0 . 022UF , 20% , 50V 
(7844 ONLY) 

CAP., FXD, CER DI : 0 . 022UF , 10% , 50V 
(7844 ONLY) 

CAP., FXD, CER DI : 0 . 022UF , 20% , 50V 
(R7844 ONLY) 

CAP., FXD, CER DI :0 .022UF , 10% , 50V 
(R7844 ONLY) 

CAP., FXD, CER DI : 5600PF , 20% , 200V 
(C3630 , 7844/R7844 ONLY) 

CAP., FXD, CER DI : 0 . 01UF , 20% , 50V 
(C3634, 7844/R7844 ONLY) 

CAP. , FXD, CER DI : 1PF, 10%, 50V 
(C3638, 7844/R7844 ONLY) 

CAP., FXD, CER DI : 1PF , 10% , 50V 
(C3639, 7844/R7844 ONLY) 

CAP., FXD, CER DI : 1PF , 10% , 50V 
(C3660, 7844/R7844 ONLY) 

CAP., FXD, CER DI : 220PF , 10% , 200V 
(C3661 , 7844/R7844 ONLY) 

CAP., FXD, CER DI : 1PF , 10% , 50V 
(C3662 , 7844/R7844 ONLY) 

CAP., FXD, CER DI : 1PF , 10% , 50V 
(C3663 , 7844/R7844 ONLY. NOMINAL VALUE, 
SELECTED AND ADDED IF NECESSARY) 

CAP., FXD, CER DI : 5 . 6PF , 5% , 200V 
(7844 ONLY) 

(NOMINAL VALUE, SELECTED) 

CAP., VAR, CER DI : 2 . 5-9PF , 1 00V 
(7844 ONLY) 

CAP., FXD, CER DI : 5 . 6PF, 5% , 200V 
( R7844 ONLY) 

(NOMINAL VALUE, SELECTED) 

CAP., VAR, CER DI : 2 . 5-9PF , 100V 
( R7844 ONLY) 



72982 8101B057COK0109B 

56289 272C13 

72982 8101 B057C0K0109B 

72982 8101 BOS 7C0K0109B 

72982 8111 B200COG569C 

72982 518-000A2 . 5-9 

72982 8111 B200C0G569C 

72982 518-000A2 . 5-9 

72982 8121N204 E 562M 

72982 8121N075Z5U0223M 

72982 8121N083X7R0223K 

72982 8121N075Z5U0223M 

72982 8121N083X7R0223K 

72982 8121N204 E 562M 

72982 8121N061Z5U0103M 

72982 81O1BO57COK01O9B 
72982 8101B057COK0109B 

72982 8101B057COK0109B 

56289 272C13 

72982 8101B057C0K0109B 

72982 8101B057COK0109B 

72982 8111 B200C0G569C 

72982 518-000A2 . 5-9 

72982 8111 B200C0G569C 

72982 51 8-000A2 . 5-9 



REV OCT 1981 



8-23 





Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eff Dscont 


Name & Description 


Mtr 

Code 


Mfr Part Number 


C3666 


283-0180-00 






CAP. ,FXD,CER DI : 5600PF , 20% , 200V 
(C3666 , 7844/R7844 ONLY) 

CAP . , FXD , CER DI : 0 . 022UF , 20% , 50V 
(7844 ONLY) 

CAP., FXD, CER DI : 0 . 022UF, 10% , 50V 
(7844 ONLY) 


72982 


8121N204 E 562M 


C3667 


283-0191-00 


B010100 


B049999 


72982 


8121N075Z5U0223M 


C3667 


283-0239-00 


B050000 




72982 


8121N083X7R0223K 














C3667 


283-0191-00 


B010100 


B039999 


CAP., FXD, CER DI : 0 . 022UF, 20% , 50V 
( R7844 ONLY) 

CAP. , FXD, CER DI : 0 . 022UF , 10% , 50V 
(R7844 ONLY) 

CAP., FXD, CER DI : 5600PF , 20% , 200V 
(C3676, 7844/R7844 ONLY) 


72982 


8121N075Z5U0223M 


C3667 


283-0239-00 


B040000 




72982 


8121N083X7R0223K 


C3676 


283-0180-00 






72982 


8121N204 E 562M 














C3682 


283-0204-00 






CAP., FXD, CER DI : 0 . 01UF , 20% , 50V 
(C3682 , 7844/R7844 ONLY) 

CAP., FXD, CER DI : 1PF, 10% , 50V 
(C3686, 7844/R7844 ONLY) 

CAP., FXD, CER DI : 1PF, 10% , 50V 
(C3688, 7844/R7844 ONLY) 


72982 


8121N061Z5U0103M 


C3686 


283-0158-00 






72982 


8101B057COK0109B 


C3688 


283-0158-00 






72982 


8101B057C0K0109B 














C3697 


283-0204-00 






CAP., FXD, CER DI : 0 . 01UF , 20% , 50V 
(C3697, 7844/R7844 ONLY) 

CAP., FXD, CER DI : 0 . 01UF, 20% , 50V 
(C3698, 7844/R7844 ONLY) 

CAP., FXD, CER DI : 0 . 01UF, 20% , 50V 
(C3699 , 7844/R7844 ONLY) 


72982 


8121N061Z5U0103M 


C3698 


283-0204-00 






72982 


8121N061Z5U0103M 


C3699 


283-0204-00 






72982 


8121N061Z5U0103M 














C3701 


283-0158-00 






CAP., FXD, CER DI: 1PF,10%,50V 
(C3701 , 7 844/ R7 844 ONLY) 

CAP., FXD, CER DI : 87 PF, 51,100V 
(C3705, 7844/R7844 ONLY) 

CAP., FXD, CER DI : 1PF , 10% , 50V 
(C3711 , 7844/R7844 ONLY) 


72982 


8101BO57C0K0109B 


C3705 


283-0251-00 






72982 


8121 B145C0G0870J 


C3711 


283-0158-00 






72982 


8101BO57C0K0109B 














C3715 


283-0158-00 






CAP., FXD, CER DI : 1PF, 10% , 50V 
(C3715, 7844/ R7 844 ONLY) 

CAP., FXD, CER DI : 220PF, 10% , 200V 
(C3716, 7844/R7844 ONLY) 

CAP., FXD, CER DI : 1PF , 10% , 50V 
(C3717 , 7844/R7844 ONLY) 


72982 


8101B057COK0109B 


C3716 


283-0108-00 






56289 


272C13 


C3717 


283-0158-00 






72982 


81O1B057C0K0109B 














C3718 


283-0158-00 


XB010149 




CAP., FXD, CER DI : 1PF, 10% , 50V 
(C3718, 7844/R7844 ONLY. NOMINAL VALUE, 
SELECTED AND ADDED IF NECESSARY) 

CAP., FXD, CER DI : 5. 6PF , 5% , 200V 
(7844 ONLY) 

(NOMINAL VALUE, SELECTED) 


72982 


8101B057COK0109B 














C3720 


283-0260-00 


B010100 


B049999 


72982 


81 1 1B200C0G569C 


























C3720 


281-0122-00 


B050000 




CAP., VAR, CER DI : 2 . 5-9PF , 100V 
(7844 ONLY) 

CAP., FXD, CER DI : 5 . 6PF , 5% , 200V 
( R7844 ONLY) 

(NOMINAL VALUE, SELECTED) 

CAP., VAR, CER DI : 2 . 5-9PF , 100V 
(R7844 ONLY) 


72982 


518-000A2. 5-9 


C3720 


283-0260-00 


B010100 


B039999 


72982 


81 1 1B20OC0G569C 














C3720 


281-0122-00 


B040000 




72982 


518-000A2 . 5-9 














C3721 


283-0180-00 






CAP . , FXD , CER DI : 5600PF , 20% , 200V 
(C3721 , 7844/R7844 ONLY) 

CAP., FXD, CER DI : 0 .022UF , 20%, 50V 
(7844 ONLY) 

CAP., FXD, CER DI : 0 . 022UF , 10% , 50V 
(7844 ONLY) 


72982 


8121N204 E 562M 


C3722 


283-0191-00 


B010100 


B049999 


72982 


8121N075Z5U0223M 


C3722 


283-0239-00 


B050000 




72982 


8121N083X7R0223K 














C3722 


283-0191-00 


B010100 


B039999 


CAP., FXD, CER DI : 0 . 022UF , 20% , 50V 
(R7844 ONLY) 


72982 


8121N075Z5U0223M 



8-24 



REV OCT 1981* 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No, 



Ckt No. 


Part No. 


Eff 


Dscont 


C3722 


283-0239-00 


B040000 




C3730 


283-0180-00 






C3734 


283-0204-00 






C3738 


283-0158-00 






C3739 


283-0158-00 






C3760 


283-0158-00 






C3761 


283-0108-00 






C3762 


283-0158-00 






C3763 


283-0158-00 


XB010149 




C3765 


283-0260-00 


B010100 


B049999 


C37b5 


281-0122-00 


B050000 




C3765 


283-0260-00 


B010100 


B039999 


C3765 


281-0122-00 


B040000 




C3766 


283-0180-00 






C3767 


283-0191-00 


B010100 


B049999 


C3767 


283-0239-00 


B050000 




C3767 


283-0191-00 


B010100 


B039999 


C3767 


283-0239-00 


B040000 




C3776 


283-0180-00 






C3782 


283-0204-00 






C3786 


283-0158-00 






C3788 


283-0158-00 






C4108 


283-0004-00 






C41 16 


285-0809-00 






C4120 


283-0198-00 






C4130 


281-0523-00 






C4135 


285-0809-00 







Mfr 

Name & Description Code Mfr Part Number 



CAP. ,FXD,CER DI : 0.022UF, 10% , 50V 
(R7844 ONLY) 


72982 


8121N083X7R0223K 


CAP., FXD, CER DI:5600PF, 20% ,200V 
(C3730, 7844/R7844 ONLY) 


72982 


8121N204 E 562M 


CAP. , FXD, CER DI : 0 .01UF , 20% , 50V 
(C3734, 7844/R7844 ONLY) 


72982 


8121N061Z5U0103M 


CAP, , FXD, CER DI : 1PF , 10% , 50V 
(C3738, 7844/R7844 ONLY) 


72982 


8101B057C0K0109B 


CAP , , FXD, CER DI : 1PF , 10% , 50V 
(C3739, 7844/R7844 ONLY) 


72982 


8101B057C0K0109B 


CAP., FXD, CER DI: 1PF, 10%, 50V 
(C3760, 7844/R7844 ONLY) 


72982 


8101B057COK0109B 


CAP., FXD, CER DI : 220PF, 10% , 200V 
(C3761, 7844/R7844 ONLY) 


56289 


272C13 


CAP., FXD, CER DI : 1PF, 10%,50V 
(C3762, 7844/R7844 ONLY) 


72982 


8101B057C0K0109B 


CAP., FXD, CER DI : 1PF , 10% , 50V 
(C3763, 7844/R7844 ONLY, NOMINAL VALUE, 
SELECTED AND ADDED IF NECESSARY) 


72982 


8101B057C0K0109B 


CAP. , FXD, CER DI : 5 . 6PF , 5% , 200V 
(7844 ONLY) 

(NOMINAL VALUE, SELECTED) 


72982 


81 1 1B200C0G569C 


CAP,, VAR, CER DI : 2. 5-9PF, 100V 
(7844 ONLY) 


72982 


518-000A2 . 5-9 


CAP., FXD, CER DI : 5 . 6PF , 5% , 200V 
(R7844 ONLY) 

(NOMINAL VALUE, SELECTED) 


72982 


81 1 1B200C0G569C 


CAP. , VAR, CER DI : 2 . 5-9PF, 100V 
(R7844 ONLY) 


72982 


518-OOOA2 . 5-9 


CAP., FXD, CER DI : 5600PF , 20% , 200V 
(C3766 , 7844/R7844 ONLY) 


72982 


8121N204 E 562M 


CAP., FXD, CER DI : 0 . 022UF , 20% , 50V 
(7844 ONLY) 


72982 


8121N075Z5U0223M 


CAP,,, FXD, CER DI : 0 . 022UF , 10% , 50V 
(7844 ONLY) 


72982 


81 21N083X7R0223K 


CAP., FXD, CER DI : 0 . 022UF , 20% , 50V 
(R7844 ONLY) 


72982 


8121N075Z5U0223M 


CAP., FXD, CER DI : 0 . 022UF , 10% , 50V 
(R7844 ONLY) 


72982 


81 21N083X7R0223K 


CAP,,, FXD, CER DI : 5600PF , 20% , 200V 
(C3776 , 7844/R7844 ONLY) 


72982 


8121N204 E 562M 


CAP., FXD, CER DI : 0 . 01UF , 20% , 50V 
(C3782 , 7844/R7844 ONLY) 


72982 


81 2 1N061Z5U0103M 


CAP,,, FXD, CER DI : 1PF , 10% , 50V 
(C3786 , 7844/R7844 ONLY) 


72982 


8101B057C0K0109B 


CAP. , FXD, CER DI : 1PF , 10% , 50V 
(C3788, 7844/R7844 ONLY) 


72982 


8101 B057C0K0109B 


CAP. , FXD, CER DI:0.02UF, +80-20%, 150V 
(C41.08, OPTION 22 ONLY) 


91418 


SP203Z151-4R9 


CAP , , FXD , PLSTC : 1UF , 1 0% , 50V 
(C4116, OPTION 22 ONLY) 


56289 


LP66A1 A105K 


CAP. , FXD, CER DI : 0 . 22UF, 20% , 50V 
(C4120, OPTION 22 ONLY) 


72982 


8121N083Z5U0224M 


CAP. , FXD, CER DI : 100PF , +/-20PF , 500V 
(C4130 , OPTION 22 ONLY) 


72982 


301-000U2M0101M 


CAP. , FXD, PLSTC :1UF, 10%, 50V 
(C4135 , OPTION 22 ONLY) 


56289 


LP66A1 A105K 



REV OCT 1981 



8-25 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No, 



Ckt No. 


Part No. 


Eft 


Dscont 


C4142 


290-0177-00 






C4154 


283-0328-00 






C4155 


283-0178-00 






C4159 


283-0150-00 






C4162 


281-0549-00 






C4169 


283-0179-00 






C4172 


283-0249-00 






C4807 


283-0599-00 


XB100000 




C4807 


283-0599-00 


XB 11 0000 




C4823 


281-0219-00 


XB100000 


B100453 


C4823 


281-0158-00 


B100454 




C4823 


281-0219-00 


XB 110000 


Bl 10894 


C4823 


281-0158-00 


B110895 




C4833 


283-0618-00 


XB100000 




C4833 


283-0618-00 


XB110000 




C4843 


283-0618-00 


XB100000 




C4843 


283-0618-00 


XB110000 




C4850 


281-0166-00 


XB100000 




C4850 


281-0166-00 


XB1 10000 




C4851 


283-0633-00 


XB100000 




C4851 


283-0633-00 


XB1 10000 




C4855 


281-0526-00 


XB100000 


B100453X 


C4855 


281-0526-00 


XB 11 0000 


B110894X 


C4858 


281-0773-00 


XB100000 




C4858 


281-0773-00 


XB1 10000 




C4860 


281-0166-00 


XB100000 




C4860 


281-0166-00 


XB1 10000 




C4861 


283-0633-00 


XB100000 




C4861 


283-0633-00 


XB 110000 





Name & Description 



CAP . , FXD , ELCTLT : 1UF , 20% , 50V 
(C4142 , OPTION 22 ONLY) 

CAP. ,FXD,CER DI : 0 . 03UF, +80-202! , 200 V 
(C4154, OPTION 22 ONLY) 

CAP. , FXD, CER DI:0.1UF, +80-20% ,100V 
(C4155, OPTION 22 ONLY) 

CAP. ,FXD,CER DI : 650PF, 5% , 200V 
(C4159 , OPTION 22 ONLY) 

CAP. , FXD, CER DI:68PF, 10% ,500V 
(C4162, OPTION 22 ONLY) 

CAP. , FXD, CER DI : 0 . 68UF , 10% , 100V 
(C4169 , OPTION 22 ONLY) 

CAP. ,FXD,CER DI : 0 . 068UF , 10% , 50V 
(C4172, OPTION 22 ONLY) 

CAP. , FXD, MICA D: 98PF,5%,500V 
(R7844 ONLY) 

CAP. , FXD, MICA D:98PF,5%,500V 
(7844 ONLY) 



CAP . , VAR,CER DI : 5-35PF ,+2-2 . 5% , 100V 
(R7844 ONLY) 

CAP . , VAR ,CER DI : 7-45PF , 50V 
( R7844 ONLY) 

CAP. ,VAR,CER DI : 5-35PF ,+2-2.5%, 100V 
(7844 ONLY) 

CAP. ,VAR,CER DI : 7-45PF , 50V 
(7844 ONLY) 

CAP. , FXD, MICA D: 130PF , 2% ,400V 
(R7844 ONLY) 

CAP. ,FXD, MICA D: 130PF,2%,400V 
(7844 ONLY) 

CAP. , FXD, MICA D: 130PF,2%,400V 
(R7844 ONLY) 

CAP. , FXD, MICA D: 130PF,2%,400V 
(7844 ONLY) 

CAP. , VAR, AIR DI:1. 9-15. 7PF, 250V 
(R7844 ONLY) 



CAP., VAR, AIR DI:1. 9-15. 7PF, 250V 
(7844 ONLY) 

CAP. , FXD, MICA D: 77PF , 1% , 100V 
(R7844 ONLY) 

CAP., FXD, MICA D: 77PF, 1% , 100V 
(7844 ONLY) 



CAP . , FXD , CER DI : 1 . 5PF , +/-0 . 5PF , 500V 
( R7844 ONLY) 

CAP . , FXD , CER DI : 1 . 5PF , +/-0 . 5PF , 500V 
(7844 ONLY) 

CAP., FXD, CER DI : 0 . 01UF , 10% , 100V 
(R7844 ONLY) 



CAP. , FXD, CER DI:0.01UF, 10X,100V 
(7844 ONLY) 

CAP. , VAR, AIR DI : 1.9-1 5. 7PF, 250V 
(R7844 ONLY) 

CAP., VAR, AIR DI:1. 9-15. 7PF, 250V 
(7844 ONLY) 



CAP. , FXD, MICA D : 77PF , 1% , 100V 
(R7844 ONLY) 

CAP. , FXD, MICA D: 77PF, 1%, 100V 
(7844 ONLY) 



Mtr 

Code Mfr Part Number 



56289 


162D105X0050CD2 


72982 


8131N225Z5U0303Z 


72982 


8131N145651 104Z 


59660 


835-515B651 J 


59660 


301-000U2J0680K 


72982 


8151N150 C684K 


72982 


8131N075 C 683K 


00853 


D105E980J0 


00853 


D105E980J0 


72982 


513-001 5-30 


73899 


DVJ-5006 


72982 


513-001 5-30 


73899 


DVJ-5006 


00853 


D155E131GO 


00853 


D155E131GO 


00853 


D155E131GO 


00853 


D155E131GD 


74970 


187-0109-005 


74970 


187-0109-005 


00853 


DI 51E770F0 


00853 


D151E770F0 


04222 


7001-1313 


04222 


7001-1313 


04222 


GC70-1C103K 


04222 


GC70-1C103K 


74970 


187-0109-005 


74970 


187-0109-005 


00853 


D151E77OF0 


00853 


D151E770F0 



8-26 



REV OCT 1981 



Replaceable Electrical Parts— 7844/R7844 Service 



Tektronix Serial/Model No. 

Ckt No. Part No. Eff Dscont Name & Description 



Mfr 

Code 



C4873 


281-0773-00 


XB100000 


C4873 


281-0773-00 


XB 110000 


C4874 


283-0002-00 


XB100000 


C4874 


283-0002-00 


XB110000 


C4878 


281-0659-00 


XB100000 


C4878 


281-0659-00 


XB110000 


C4881 


281-0773-00 


XB 100000 


C4881 


281-0773-00 


XB1 10000 


C4883 


283-0002-00 


XB 100000 


C4883 


283-0002-00 


XB1 10000 


C4891 


281-0773-00 


XB 100000 


C4891 


281-0773-00 


XB 11 0000 


C4894 


283-0002-00 


XB100000 


C4894 


283-0002-00 


XB 110000 


C4898 


281-0659-00 


XB 100000 


C4898 


281-0659-00 


XB1 10000 


C4976 


283-0002-00 


XB100000 


C4976 


283-0002-00 


XB 110000 


C4984 


283-0002-00 


XB100000 


C4984 


283-0002-00 


XB 110000 


C4986 


281-0773-00 


XB 100000 


C4986 


281-0773-00 


XB1 10000 


C4989 


283-0002-00 


XB100000 


C4989 


283-0002-00 


XB110000 


C4991 


290-0745-00 


XB100000 


C4991 


290-0745-00 


XB 11 0000 


C4993 


290-0745-00 


XB100000 


C4993 


290-0745-00 


XB 11 0000 



CAP., FXD, CER DI:0.01UF,10%,100V 04222 

(R7844 ONLY) 

CAP . , FXD , CER DI : 0 . 01UF , 10% , 100V 04222 

(7844 ONLY) 

CAP . , FXD j CER DI:0.01UF, +80-20%, 500V 91418 

(R7844 ONLY) 

CAP., FXD. CER DI:0.01UF, +80-20%, 500V 91418 

(7844 ONLY) 

CAP. ,FXD,,CER DI : 4 . 3PF , +/-0 . 25PF, 500V 59660 

( R7844 ONLY) 

CAP. ,FXD :1 CER DI : 4 . 3PF ,+/-0 . 25PF , 500V 59660 

(7844 ONLY) 

CAP., FXD, CER DI : 0 . 01UF , 10% , 100V 04222 

(R7844 ONLY) 

CAP., FXD, CER DI : 0 . 01UF , 10% , 100V 04222 

(7844 ONLY) 

CAP., FXD, CER DI:0.01UF, +80-20%, 500V 91418 

( R7844 ONLY) 

CAP., FXD, CER DI:0.01UF, +80-20%, 500V 91418 

(7844 ONLY) 

CAP., FXD, CER DI :0.01UF, 10%, 100V 04222 

(R7844 ONLY) 

CAP., FXD, CER DI : 0 . 01UF , 10% , 100V 04222 

(7844 ONLY) 

CAP., FXD, CER DI:0. 01UF, +80-20%, 500V 91418 

(R7844 ONLY) 

CAP., FXD, CER DI:0.01UF, +80-20%, 500V 91418 

(7844 ONLY) 

CAP., FXD, CER DI : 4. 3PF,+/-0 . 25PF , 500V 59660 

(R7844 ONLY) 

CAP., FXD, CER DI : 4 . 3PF.+/-0 . 25PF , 500V 59660 

(7844 ONLY) 

CAP., FXD, CER DI:0.01UF, +80-20%, 500V 91418 

(R7844 ONLY) 

CAP., FXD, CER DI:0.01UF, +80-20%, 500V 91418 

(7844 ONLY) 

CAP., FXD, CER DI:0.01UF, +80-20%, 500V 91418 

(R7844 ONLY) 

CAP., FXD, CER DI-.0.01UF, +80-20%, 500V 91418 

(7844 ONLY) 

CAP., FXD, CER DI : 0. 01UF, 10% ,100V 04222 

(R7844 ONLY) 

CAP., FXD, CER DI : 0.01UF, 10%, 100V 04222 

(7844 ONLY) 

CAP., FXD, CER DI:0.01UF, +80-20%, 500V 91418 

(R7844 ONLY) 

CAP., FXD, CER DI:0.01UF, +80-20%, 500V 91418 

(7844 ONLY) 

CAP. , FXD, ELCTLT:22UF, +50-10%, 25V 56289 

(R7844 ONLY) 

CAP. , FXD, ELCTLT:22UF, +50-10%, 25V 56289 

(7844 ONLY) 

CAP. , FXD, ELCTLT.-22UF, +50-10%, 25V 56289 

(R7844 ONLY) 

CAP., FXD, ELCTLT:22UF, +50-10%, 25V 56289 

(7844 ONLY) 



Mfr Part Number 

GC70-1C103K 
GC70-1C103K 
81 1-546E103Z 

81 1-546E103Z 

301-OOOCOH0439C 

301-OOOCOH0439C 

GC70-1C103K 
GC70-1C103K 
81 1-546E103Z 

81 1-546E103Z 

GC70-1C103K 

GC70-1C103K 

81 1-546E103Z 
81 1-546E103Z 
301-000C0H0439C 

301-000C0H0439C 
81 1-546E103Z 
81 1-546E103Z 

81 1-546E103Z 
81 1-546E103Z 
GC70-1C103K 

GC70-1C103K 
81 1-546E103Z 
81 1-546E103Z 

502D225 

502D225 

502D225 

502D225 



REV OCT 1981 



8-27 



Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eft 


Dscont 


C4999 


290-0745-00 


XB100000 




C4999 


290-0745-00 


XB110000 




C5807 


283-0599-00 


XB100000 




C5807 


283-0599-00 


XB110000 




C5823 


281-0219-00 


XB100000 


B100453 


C5823 


281-0158-00 


B100454 




C5823 


281-0219-00 


XB 11 0000 


B110894 


C5823 


281-0158-00 


B100895 




C5833 


283-0618-00 


XB100000 




C5833 


283-0618-00 


XB110000 




C5843 


283-0618-00 


XB100000 




C5843 


283-0618-00 


XB1 10000 




C5850 


281-0166-00 


XB100000 




C5850 


281-0166-00 


XB 11 0000 




C5851 


283-0633-00 


XB100000 




C5851 


283-0633-00 


XB1 10000 




C5858 


281-0773-00 


XB 100000 




C5858 


281-0773-00 


XB110000 




C5860 


281-0166-00 


XB100000 




C5860 


281-0166-00 


XB110000 




C5861 


283-0633-00 


XB100000 




C5861 


283-0633-00 


XB1 10000 




C5873 


281-0773-00 


XB100000 




C5873 


281-0773-00 


XB110000 




C5874 


283-0002-00 


XB100000 




C5874 


283-0002-00 


XB110000 




C5878 


281-0659-00 


XB 100000 




C5878 


281-0659-00 


XB1 10000 




C5881 


281-0773-00 


XB100000 





Name & Description 



CAP . , FXD , ELCTLT : 22UF , +50- 1 0% , 2 5 V 
(R7844 ONLY) 

CAP . , FXD , ELCTLT : 2 2UF , +50-1 0% , 25V 
(7844 ONLY) 

CAP. , FXD, MICA D:98PF,5%,500V 
( R7844 ONLY) 

CAP. , FXD, MICA D: 98PF, 5% , 500V 
(7844 ONLY) 

CAP . , VAR, CER DI : 5-35PF , +2-2 . 5% , 100V 
(R7844 ONLY) 

CAP., VAR, CER Dl : 7-45PF.50V 
(R7844 ONLY) 

CAP . , VAR, CER DI : 5-35PF , +2-2 .5 % , 100V 
(7844 ONLY) 

CAP., VAR, CER Dl : 7-45PF , 50V 
(7844 ONLY) 

CAP. , FXD, MICA D : 130PF, 2% ,400V 
(R7844 ONLY) 

CAP., FXD, MICA D:130PF, 22,400V 
(7844 ONLY) 

CAP. , FXD, MICA D:130PF, 22,400V 
( R7844 ONLY) 

CAP. , FXD, MICA D: 130PF,2%,400V 
(7844 ONLY) 

CAP., VAR, AIR Dili. 9-15. 7PF, 250V 
(R7844 ONLY) 

CAP., VAR, AIR DI:1. 9-15. 7PF, 250V 
(7844 ONLY) 

CAP. , FXD, MICA D:77PF, 12,100V 
(R7844 ONLY) 

CAP. , FXD, MICA D:77PF, 12,100V 
(7844 ONLY) 

CAP., FXD, CER DI:0.01UF, 102,100V 
(R7844 ONLY) 

CAP., FXD, CER DI:0.01UF, 102,100V 
(7844 ONLY) 

CAP., VAR, AIR DI:1. 9-15. 7PF, 250V 
(R7844 ONLY) 

CAP., VAR, AIR DI : 1 . 9-15. 7PF, 250V 
(7844 ONLY) 

CAP. , FXD, MICA D:77PF, 12,100V 
(R7844 ONLY) 

CAP., FXD, MICA D:77PF, 12,100V 
(R7844 ONLY) 

CAP., FXD, CER DI:0.01UF, 102,100V 
(R7844 ONLY) 

CAP., FXD, CER DI:0.01UF, 102,100V 
(7844 ONLY) 

CAP. , FXD, CER DI:0.01UF, +80-202, 500V 
(R7844 ONLY) 

CAP. , FXD, CER DI:0.01UF, +80-202, 500V 
(7844 ONLY) 

CAP . , FXD , CER DI : 4 . 3PF , +/-0 . 25PF , 500V 
( R7844 ONLY) 

CAP. , FXD, CER DI : 4 . 3PF , +/-0 . 25PF , 500V 
(7844 ONLY) 

CAP., FXD, CER DI:0.01UF, 102,100V 
(R7844 ONLY) 



Mfr 

Code 


Mfr Part Number 


56289 


502D225 


56289 


502D225 


00853 


D105E980J0 


00853 


D105E980J0 


72982 


513-001 5-30 


73899 


DVJ-5006 


72982 


513-001 5-30 


73899 


DVJ-5006 


00853 


D155E131G0 


00853 


D155E131GO 


00853 


D155E131G0 


00853 


D155E131GO 


74970 


187-0109-005 


74970 


187-0109-005 


00853 


D151E770F0 


00853 


D151E770F0 


04222 


GC70-1C103K 


04222 


GC70-1C103K 


74970 


187-0109-005 


74970 


187-0109-005 


00853 


D151E770F0 


00853 


D151E770F0 


04222 


GC70-1C103K 


04222 


GC70-1C103K 


91418 


81 1-546E103Z 


91418 


811-546E103Z 


59660 


301-000C0H0439C 


59660 


301-000C0H0439C 


04222 


GC70-1C103K 



8-28 



REV OCT 1981 




Replaceable Electrical Parts — 7844 /R 7844 Service 



Tektronix 
Ckt No. Part No. 



Serial/Model No. 

Eft Dscont 



Name & Description 



Mfr 

Code Mfr Part Number 



C5881 


281-0773-00 


XB110000 


C5883 


283-0002-00 


XB100000 


C5883 


283-0002-00 


XB110000 


C5891 


281-0773-00 


XB 100000 


C5891 


281-0773-00 


XB1 10000 


C5894 


283-0002-00 


XB 100000 


C5894 


283-0002-00 


XB 110000 


C5898 


281-0659-00 


XB 100000 


C5898 


281-0659-00 


XB110000 


C5976 


283-0002-00 


XB100000 


C5976 


283-0002-00 


XB110000 


C5984 


283-0002-00 


XB 100000 


C5984 


283-0002-00 


XB110000 


C5986 


281-0773-00 


XB100000 


C5986 


281-0773-00 


XB110000 


C5988 


283-0002-00 


XB100000 


C5988 


283-0002-00 


XB110000 


C5991 


290-0745-00 


XB100000 


C5991 


290-0745-00 


XB110000 


C5993 


290-0745-00 


XB100000 


C5993 


290-0745-00 


XB 110000 


C5999 


290-0745-00 


XB 100000 


C5999 


290-0745-00 


XB110000 


CR11 


152-0141-02 




CR13 


152-0141-02 




CR14 


152-0141-02 




CR15 


152-0141-02 




CR16 


152-0141-02 




CR17 


152-0141-02 




CR18 


152-0141-02 




CR19 


152-0141-02 




CR20 


152-0141-02 




CR37 


152-0141-02 





CAP. .FXD.CER DI:0.01UF, 10% ,100V 
(7844 ONLY) 


04222 


GC70-1C103K 


CAP. , FXD.CER DI : 0 . 01UF ,+80-20% , 500V 
(R7844 ONLY) 


91418 


81 1-546E103Z 


CAP. , FXD.CER DI:0.01UF, +80-20%, 500V 
(7844 ONLY) 


91418 


81 1-546E103Z 


CAP. .FXD.CER DI : 0 . 01UF , 10% ,100V 
(R7844 ONLY) 


04222 


GC70-1C103K 


CAP. .FXD.CER DI : 0 . 01UF , 10% , 100V 
(7844 ONLY) 


04222 


GC70-1C103K 


CAP. .FXD.CER DI : 0 . 01UF , +80-20% ,500V 
( R7844 ONLY) 


91418 


81 1-546E103Z 


CAP. .FXD.CER DI:0.01UF, +80-20%, 500V 
(7844 ONLY) 


91418 


811-546E103Z 


CAP. .FXD.CER DI : 4 . 3PF.+/-0 . 25PF, 500V 
(R7844 ONLY) 


59660 


301-OOOCOH0439C 


CAP ..FXD.CER DI : 4 . 3PF , +/-0 . 25PF , 500V 
(7844 ONLY) 


59660 


301-000C0H0439C 


CAP . .FXD.CER DI : 0 . 01UF , +80-20% , 500V 
(R7844 ONLY) 


91418 


81 1-546E103Z 


CAP. .FXD.CER DI:0.01UF, +80-20%, 500V 
(7844 ONLY) 


91418 


81 1-546E103Z 


CAP . , FXD.CER DI : 0 . 01UF , +80-20% , 500V 
(R7844 ONLY) 


91418 


81 1-546E103Z 


CAP. .FXD.CER DI:0.01UF, +80-20%, 500V 
(7844 ONLY) 


91418 


81 1-546E103Z 


CAP., FXD.CER DI :0 .01UF , 10% , 100V 
(R7844 ONLY) 


04222 


GC70-1C103K 


CAP., FXD.CER DI : 0 . 01UF , 10% , 100V 
(7844 ONLY) 


04222 


GC70-1C103K 


CAP., FXD.CER DI:0.01UF, +80-20%, 500V 
( R7844 ONLY) 


91418 


81 1-546E103Z 


CAP. .FXD.CER DI:0.01UF, +80-20%, 500V 
(7844 ONLY) 


91418 


81 1-546E103Z 


CAP . , FXD , ELCTLT : 22UF , +50-10%, 25V 
(R7844 ONLY) 


56289 


502D225 


CAP. , FXD, ELCTLT: 22UF, +50-10%, 25V 
(7844 ONLY) 


56289 


502D225 


CAP. , FXD, ELCTLT :22UF, +50-10%, 25V 
(R7844 ONLY) 


56289 


502D225 


CAP. , FXD, ELCTLT :22UF, +50-10%, 25V 
(7844 ONLY) 


56289 


502D225 


CAP . , FXD , ELCTLT : 22UF , +50-1 0% , 2 5 V 
(R7844 ONLY) 


56289 


502D225 


CAP., FXD, ELCTLT: 22UF, +50-10%, 25V 
(7844 ONLY) 


56289 


502D225 


SEMICOND DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 


SEMICOND DEVICE : SILICON, 30V , 150MA 


01295 


1N4152R 


SEMICOND DEVICE : SILICON , 30V , 150MA 


01295 


1N4152R 


SEMICOND DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 


SEMICOND DEVICE: SILICON ,30V, 150MA 


01295 


1N4152R 


SEMICOND DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 


SEMICOND DEVICE : SILICON , 30V , 150MA 


01295 


1N4152R 


SEMICOND DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 


SEMICOND DEVICE : SILICON, 30V, 150MA 


01295 


1N4152R 


SEMICOND DEVICE :S1L1C0N,30V, 150MA 


01295 


1N4152R 



REV OCT 1981 



8-29 




Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 



Tektronix Serial/Model No. 
Part No. Eff Oscont 



Name & Description 



CR38 


152-0141-02 


CR39 


152-0141-02 


CR40 


152-0141-02 


CR110 


152-0141-02 


CR111 


152-0141-02 


CR134 


152-0141-02 


CR142 


152-0423-00 


CR143 


152-0423-00 


CR218 


152-0141-02 


CR232 


152-0141-02 


CR234 


152-0075-00 


CR235 


152-0075-00 


CR237 


152-0141-02 


CR238 


152-0141-02 


CR242 


152-0141-02 


CR246 


152-0141-02 


CR253 


152-0141-02 


CR254 


152-0141-02 


CR258 


152-0141-02 


CR268 


152-0141-02 


CR288 


152-0141-02 


CR289 


152-0141-02 


CR290 

CR290 


152-0141-02 B010100 B030211X 



SEMICOND DEVICE : SILICON, 30V, 150MA 
SEMICOND DEVICE: SILICON, 30V, 150MA 
SEMICOND DEVICE : SILICON, 30V.150MA 
SEMICOND DEVICE: SILICON, 30V.150MA 
SEMICOND DEVICE : SILICON, 30V, 150MA 
SEMICOND DEVICE .-SILICON, 30V, 150MA 

SEMICOND DEVICE : SILICON, 400V, 3A 
SEMICOND DEVICE: SILICON, 400V.3A 
SEMICOND DEVICE : SILICON , 30V, 150MA 
SEMICOND DEVICE : SILICON, 30V, 150MA 
SEMICOND DE VICE : GE , 25 V , 40MA 
SEMICOND DEVICE :GE, 25V, 40MA 

SEMICOND DEVICE : SILICON, 30V, 150MA 
SEMICOND DEVICE: SILICON, 30V, 150MA 
SEMICOND DEVICE : SILICON, 30V, 150MA 
SEMICOND DEVICE: SILICON, 30V, 150MA 
SEMICOND DEVICE : SILICON , 30V, 1 50MA 
SEMICOND DEVICE: SILICON, 30V, 150MA 

SEMICOND DEVICE: SILICON, 30V, 150MA 
SEMICOND DEVICE: SILICON, 30V, 150MA 
SEMICOND DEVICE : SILICON, 30V, 150MA 
SEMICOND DEVICE : SILICON, 30V, 150MA 
SEMICOND DEVICE : SILICON, 30V, 150MA 
(7844 ONLY) 



CR290 

CR290 


152-0141-02 


B010100 


B020123X 


CR290 

CR296 

CR306 


152-0141-02 

152-0141-02 

152-0141-02 


XB120000 




CR314 


152-0141-02 


XB120000 




CR315 


152-0141-02 


XB120000 




CR320 

CR320 


152-0153-00 


B010100 


B030211X 


CR320 

CR320 


152-0153-00 


B010100 


B020123X 


CR324 

CR324 


152-0153-00 


B010100 


B030211X 



SEMICOND DEVICE : SILICON, 30V, 150MA 
(R7844 ONLY) 

SEMICOND DEVICE: SILICON, 30V, 150MA 
SEMICOND DEVICE: SILICON, 30V, 150MA 
SEMICOND DEVICE : SILICON, 30V, 150MA 
SEMICOND DEVICE : SILICON, 30V, 150MA 

SEMICOND DEVICE: SILICON, 30V, 150MA 
SEMICOND DEVICE : SILICON, 15V, 50MA 
(7844 ONLY) 

SEMICOND DEVICE: SILICON, 15V.50MA 
(R7844 ONLY) 

SEMICOND DEVICE: SILICON, 15V, 50MA 
(7844 ONLY) 



CR324 

CR324 

CR325 

CR325 

CR325 

CR325 



152-0153-00 



152-0153-00 



152-0153-00 



B010100 B020123X SEMICOND DEVICE: SILICON, 15V, 50MA 

(R7844 ONLY) 

B010100 B0302UX SEMICOND DEVICE : SILICON, 15V, 50MA 

(7844 ONLY) 

B010100 B020123X SEMICOND DEVICE -.SILICON, 15V, 50MA 

(R7844 ONLY) 



CR328 

CR328 

CR328 

CR328 

CR329 

CR329 


152-0141-02 


XB030212 


152-0141-02 


XB020124 


152-0141-02 


XB030212 






CR329 

rDIOQ 


152-0141-02 


XB020124 


VKJA7 

CR331 

CR332 

CR339 

CR346 


152-0333-00 

152-0333-00 

152-0141-02 

152-0141-02 




CR354 

CR355 


152-0141-02 

152-0141-02 


XB 120000 
XB 120000 



SEMICOND DEVICE: SILICON, 30V, 150MA 
(7844 ONLY) 

SEMICOND DEVICE: SILICON, 30V, 150MA 
(R7844 ONLY) 

SEMICOND DEVICE : SILICON , 30V, 150MA 
(7844 ONLY) 

SEMICOND DEVICE : SILICON , 30V , 1 50MA 
(R7844 ONLY) 

SEMICOND DEVICE : SILICON ,55V, 200MA 
SEMICOND DEVICE: SILICON, 55V, 200MA 
SEMICOND DEVICE : SILICON, 30V, 150MA 
SEMICOND DEVICE: SILICON, 30V, 150MA 

SEMICOND DEVICE: SILICON, 30V, 150MA 
SEMICOND DEVICE: SILICON, 30V, 150MA 



Mfr 

Code Mfr Part Number 



01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


04713 


1N5000 


04713 


1N5000 


01295 


1N4152R 


01295 


1N4152R 


14433 


G866 


14433 


G866 


01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 



01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


07263 


FD7003 


07263 


FD7003 


07263 


FD7003 



07263 


FD7003 


07263 


FD7003 


07263 


FD7003 


01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


01295 


1N4152R 


07263 

07263 

01295 

01295 


FDH-6012 

FDH-6012 

1N4152R 

1N4152R 


01295 

01295 


1N4152R 

1N4152R 



8-30 



REV OCT 1981 




Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eff Dscont 




Name & Description 


Mfr 

Code 


Mfr Part Number 


CR360 


152-0153-00 






SEMICOND 


DEVICE : SILICON ,15V, 50MA 


07263 


FD7003 




CR364 


152-0153-00 






SEMICOND 


DEVICE : SILICON ,15V, 50MA 


07263 


FD7003 




CR365 


152-0153-00 






SEMICOND 


DEVICE : SILICON, 15V, 50MA 


07263 


FD7003 




CR371 


152-0333-00 






SEMICOND 


DEVICE : SILICON ,55V, 200MA 


07263 


FDH-6012 




CR372 


152-0333-00 






SEMICOND 


DEVICE : SILICON ,55V, 200MA 


07263 


FDH-6012 




CR416 


152-0307-00 






SEMICOND 


DEVICE : SILICON, 300V , 0 . 1 3A 


04713 


SSD1150 




CR446 


152-0307-00 






SEMICOND 


DEVICE : SILICON, 300V, 0 . 1 3A 


04713 


SSD1150 




CR516 


152-0307-00 






SEMICOND 


DEVICE : SILICON , 300V , 0 . 1 3A 


04713 


SSD1150 




CR546 


152-0307-00 






SEMICOND 


DEVICE : SILICON , 300V , 0 . 1 3A 


04713 


SSD1150 




CR646 


152-0141-02 


B010100 


B110784X 


SEMICOND 


DEVICE: SILICON, 30V.150MA 


01295 


1N4152R 












(7844 OPTION 21 ONLY) 








CR646 


152-0141-02 


B010100 


B100399X 


SEMICOND 


DEVICE : SILICON , 30V , 150MA 


01295 


1N4152R 












(R7844 OPTION 21 ONLY) 








CR648 


152-0141-02 


B010100 


B100399X 


SEMICOND 


DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 












(7844 OPTION 21 ONLY) 








CR648 


152-0141-02 


B010100 


B110784X 


SEMICOND 


DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 












( R7844 OPTION 21 ONLY) 








CR916 


152-0141-02 






SEMICOND 


DEVICE : S ILICON , 30V , 1 50MA 


01295 


1N4152R 




CR958 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 150MA 


01295 


1N4152R 




CR960 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 




CR966 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 




CR972 


152-0141-02 






SEMICOND 


DEVICE: SILICON, 30V.150MA 


01295 


1N4152R 




CR974 


152-0141-02 






SEMICOND 


DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 




CR976 


152-0141-02 






SEMICOND 


DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 




CR1017 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 




CR1018 


152-0141-02 






SEMICOND 


DEVICE : S ILICON , 30V , 1 50MA 


01295 


1N4152R 




CR1037 


152-0141-02 






SEMICOND 


DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 




CR1038 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 




CR1044 


152-0141-02 






SEMICOND 


DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 




CR1046 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 




CR1064 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 




CR1066 


152-0141-02 






SEMICOND 


DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 




CR1144 


152-0141-02 






SEMICOND 


DEVICE : SILICON, 30V , 1 50MA 


01295 


1N4152R 




CR1150 


152-0061-00 






SEMICOND 


DEVICE : SILICON ,175V, 100MA 


07263 


FDH2161 




CR1164 


152-0233-00 






SEMICOND 


DEVICE: SILICON, 85V, 100MA 


80009 


152-0233- 


-00 


CR1215 


152r0396-01 






SEMICOND 


DEVICE : SILICON , 400V, 3A 


12969 


652-821 




CR1232 


152-0107-00 






SEMICOND 


DEVICE : SILICON ,400V, 400MA 


01295 


G727 




CR1234 


152-0400-00 






SEMICOND 


DEVICE: SILICON, 400V, 1A 


80009 


152-0400- 


•00 


CR1238 


152-0401-00 


B010100 


B141774X 


SEMICOND 


DEVICE : SILICON , 3-LAYER , TRIGGER 


04713 


SPT32K 












(7844 ONLY) 








CR1238 


152-0401-00 


B010100 


B140839X 


SEMICOND 


DEVICE : SILICON , 3-LAYER , TRIGGER 


04713 


SPT32K 












(R7844 ONLY) 








CR1240 


152-0107-00 






SEMICOND 


DEVICE : SILICON , 400V , 400MA 


01295 


G727 




CR1241 


152-0400-00 






SEMICOND 


DEVICE : SILICON , 400V , 1 A 


80009 


152-0400- 


-00 


CR1242 


152-0107-00 






SEMICOND 


DEVICE : SILICON , 400V ,400MA 


01295 


G727 




CR1244 


152-0107-00 






SEMICOND 


DEVICE: SILICON, 400V, 400MA 


01295 


G727 




CR1249 


152-0061-00 






SEMICOND 


DEVICE:SILICON, 175V, 100MA 


07263 


FDH2161 




CR1251 


152-0061-00 






SEMICOND 


DEVICE: SILICON, 1 75V, 100MA 


07263 


FDH2161 




CR1252 


152-0061-00 






SEMICOND 


DEVICE : SILICON, 175V, 100MA 


07263 


FDH2161 




CR1253 


152-0141-02 






SEMICOND 


DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 




CR1256 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 




CR1259 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 




CR1280 


152-0333-00 






SEMICOND 


DEVICE : SILICON, 55V, 200MA 


07263 


FDH-6012 




CR1281 


152-0333-00 






SEMICOND 


DEVICE : SILICON, 55V , 200MA 


07263 


FDH-6012 




CR1282 


152-0333-00 






SEMICOND 


DEVICE: SILICON, 55V, 200MA 


07263 


FDH-6012 




CR1283 


152-0333-00 






SEMICOND 


DEVICE : SILICON ,55V, 200MA 


07263 


FDH-6012 




CR1288 


152-0333-00 






SEMICOND 


DEVICE : SILICON , 55V , 200MA 


07263 


FDH-6012 





REV OCT 1981 



8-31 



Replaceable Electrical Parts— 7844/R7844 Service 



Tektronix Serial/Model No. 
Ckt No. Part No Etf Dscont 

CR1289 152-0333-00 

CR1290 152-0333-00 

CR1294 152-0141-02 

CR1306 152-0141-02 

CR1310 152-0397-00 

CR1311 152-0502-00 B010100 B141769 



CR1311 152-0686-00 B141770 



CR1311 152-0502-00 B010100 B140829 



CR1311 152-0686-00 B140830 



CR1312 152-0502-00 B010100 B141769 



CR1312 152-0686-00 B141770 



CR1312 152-0502-00 B010100 B140829 



CR1312 152-0686-00 B140830 



CR1313 152-0397-00 

CR1320 

CR1321 153-0052-00 B010100 B099999 

CR1322 

CR1323 

CR1320 152-0400-00 B100000 



CR1321 152-0400-00 B100000 



CR1322 152-0400-00 B100000 



CR1323 152-0400-00 B100000 



CR1320 

CR1321 153-0052-00 B010100 B089999 

CR1322 

CR1323 

CR1320 152-0400-00 B090000 



CR1321 152-0400-00 B090000 



CR1322 152-0400-00 B090000 



CR1323 152-0400-00 B090000 



CR1325 152-0061-00 
CR1326 152-0061-00 
CR1340 152-0413-00 
CR1341 152-0413-00 

CR1342 152-0413-00 
CR1343 152-0413-00 
CR1345 152-0397-00 
CR1346 152-0397-00 
CR1347 152-0397-00 
CR1348 152-0397-00 

CR1376 152-0141-02 



Name & Description 

SEMICOND DEVICE: SILICON, 55V, 200MA 
SEMICOND DEVICE: SILICON, 55V, 200MA 
SEMICOND DEVICE : SILICON, 30V , 150MA 
SEMICOND DEVICE : SILICON , 30V , 150MA 
SEMICOND DEVICE : SILICON , 50V , 12A 
SEMICOND DEVICE : SILICON, 20V, 5A 
(7844 ONLY) 

SEMICOND DEVICE : RECT , SI , 100V , 5A 
(7844 ONLY) 

SEMICOND DEVICE : SILICON, 20V, 5A 
(R7844 ONLY) 

SEMICOND DEVICE : RECT , SI , 100V, 5A 
(R7844 ONLY) 

SEMICOND DEVICE : SILICON, 20V , 5A 
(7844 ONLY) 

SEMICOND DEVICE: RECT, SI , 100V,5A 
(7844 ONLY) 

SEMICOND DEVICE : SILICON, 20V, 5A 
( R7844 ONLY) 

SEMICOND DEVICE : RECT, SI , 100V , 5A 
(R7844 ONLY) 

SEMICOND DEVICE: SILICON, 50V, 12A 

SEMICOND DVC SE:FOUR MATCHED DIODES 
(CR1320 THRU CR1323 , 7844 ONLY) 



SEMICOND DEVICE: SILICON, 400V, 1A 
(7844 ONLY) 

SEMICOND DEVICE: SILICON, 400V, 1A 
(7844 ONLY) 

SEMICOND DEVICE: SILICON, 400V, 1A 
(7844 ONLY) 

SEMICOND DEVICE: SILICON, 400V, 1A 
(7844 ONLY) 

SEMICOND DVC SE:FOUR MATCHED DIODES 
(CR1320 THRU CR1323, R7844 ONLY) 



SEMICOND DEVICE : SILICON ,400V, 1A 
(R7844 ONLY) 

SEMICOND DEVICE : SILICON ,400V , 1A 
(R7844 ONLY) 

SEMICOND DEVICE : SILICON, 400V , 1A 
(R7844 ONLY) 

SEMICOND DEVICE: SILICON, 400V, 1 A 
(R7844 ONLY) 

SEMICOND DEVICE: SILICON, 1 75V, 100MA 
SEMICOND DEVICE : SILICON , 1 7 5V , 1 OOMA 
SEMICOND DEVICE : SILICON , 400V , 750MA 
SEMICOND DEVICE : SILICON ,400V, 750MA 

SEMICOND DEVICE : SILICON , 400V , 7 50MA 
SEMICOND DEVICE : SILICON ,400V , 750MA 
SEMICOND DEVICE : SILICON, 50V , 12A 
SEMICOND DEVICE: SILICON, 50V, 12A 
SEMICOND DEVICE : SILICON, 50V, 12A 
SEMICOND DEVICE : SILICON , 50V , 12A 

SEMICOND DEVICE : SILICON ,30V, 150MA 



Mfr 

Code Mfr Part Number 

07263 FDH-6012 

07263 FDH-6012 

01295 1N4152R 

01295 1N4152R 

80009 152-0397-00 

04713 1N5823 



80009 152-0686-00 

04713 1N5823 

80009 152-0686-00 



04713 1N5823 

80009 152-0686-00 

04713 1N5823 



80009 152-0686-00 
80009 152-0397-00 
80009 153-0052-00 



80009 152-0400-00 
80009 152-0400-00 
80009 152-0400-00 



80009 152-0400-00 



80009 153-0052-00 



80009 152-0400-00 
80009 152-0400-00 
80009 152-0400-00 



80009 152-0400-00 

07263 FDH2161 

07263 FDH2161 

12969 UTR307 
12969 UTR307 

12969 UTR307 
12969 UTR307 
80009 152-0397-00 

80009 152-0397-00 

80009 152-0397-00 

80009 152-0397-00 

01295 1N4152R 



8-32 



REV OCT 1981 




Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eff Dscont 




Name & Description 


Mfr 

Code 


Mfr Part Number 


CR1378 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 


CR1402 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 


CR1410 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 SOMA 


01295 


1N4152R 


CR1429 


152-0066-01 






SEMICOND 


DEVICE : SILICON , 400V , 1 A 


15238 


LG4012 


CR1431 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 


CR1439 


152-0141-02 






SEMICOND 


DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 


CR1445 


152-0141-02 






SEMICOND 


DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 


CR1459 


152-0066-01 






SEMICOND 


DEVICE: SILICON, 400V, 1A 


15238 


LG4012 


CR1468 


152-0141-02 






SEMICOND 


DEVICE : S ILICON , 30V , 1 50MA 


01295 


1N4152R 


CR1469 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 


CR1482 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 


CR1483 


152-0141-02 






SEMICOND 


DEVICE : SILICON, 30V, 150MA 


01295 


1N4152R 


CR1489 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 


CR1499 


152-0066-01 






SEMICOND 


DEVICE: SILICON, 400V, 1 A 


15238 


LG4012 


CR1502 


152-0141-02 






SEMICOND 


DEVICE : SILICON, 30V , 150MA 


01295 


1N4152R 


CR1503 


152-0141-02 






SEMICOND 


DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 


CR1506 


152-0233-00 






SEMICOND 


DEVICE : SILICON , 85V , 1 OOMA 


80009 


152-0233-00 


CR1510 


152-0141-02 






SEMICOND 


DEVICE : SILICON, 30V , 1 50MA 


01295 


1N4152R 


CR1520 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 


CR1521 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 


CR1523 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 


CR1339 


152-0066-01 






SEMICOND 


DEVICE : SILICON , 400V , 1 A 


15238 


LG4012 


CR1543 


152-0075-00 






SEMICOND 


DEVICE :GE, 25V, 40MA 


14433 


G866 


CR1549 


152-0141-02 






SEMICOND 


DEVICE: SILICON, 30V.150MA 


01295 


1N4152R 


CR1576 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 


CR1589 


152-0066-01 






SEMICOND 


DEVICE .-SILICON, 400V, 1A 


15238 


LG4012 


CR1625 


152-0066-01 






SEMICOND 


DEVICE : SILICON , 400V , 1 A 


15238 


LG4012 


CR1631 


152-0141-02 






SEMICOND 


DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 


CR1635 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 


CR1638 


152-0242-00 






SEMICOND 


DEVICE .-SILICON, 225V, 200MA 


07263 


FDH5004 


CR1639 


152-0242-00 






SEMICOND 


DEVICE: SILICON, 225V, 200MA 


07263 


FDH5004 


CR1690 


152-0501-00 






SEMICOND 


DEVICE : SILICON , 70V , 200MA 


04713 


SSD2405 


CR1692 


152-0141-02 






SEMICOND 


DEVICE : SILICON, 30V, 150MA 


01295 


1N4152R 


CR1702 


152-0141-02 






SEMICOND 


DEVICE : S ILICON , 30V , 1 50MA 


01295 


1N4152R 


CR1704 


152-0141-02 






SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 


CR1787 


152-0141-02 


XB020000 


B039999X 


SEMICOND 


DEVICE : SILICON, 30V , 1 50MA 


01295 


1N4152R 










(7844 ONLY) 






CR1787 


152-0141-02 


XB020000 


B029999X 


SEMICOND 


DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 










(R7844 ONLY) 






CR1834 


152-0141-02 


B010100 


B099999X 


SEMICOND 


DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 










(R7844 ONLY) 






CR1834 


152-0141-02 


B010100 


B109999X 


SEMICOND 


DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 










(7844 ONLY) 






CR1836 


152-0141-02 


B010100 


B099999X 


SEMICOND 


DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 










(R7844 ONLY) 






CR1836 


152-0141-02 


B010100 


B109999X 


SEMICOND 


DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 










(7844 ONLY) 






CR1842 


152-0153-00 


B010100 


B099999X 


SEMICOND 


DEVICE: SILICON, 15V, 50MA 


07263 


FD7003 










(R7844 ONLY) 






CR1842 


152-0153-00 


B010100 


B109999X 


SEMICOND 


DEVICE : SILICON , 1 5V , 50MA 


07263 


FD7003 










(7844 ONLY) 






CR1852 


152-0153-00 


B010100 


B099999X 


SEMICOND 


DEVICE : S ILICON , 1 5V , 50MA 


07263 


FD7003 










(R7844 ONLY) 






CR1852 


152-0153-00 


B010100 


B109999X 


SEMICOND 


DEVICE: SILICON, 15V.50MA 


07263 


FD7003 










(7844 ONLY) 






CR1860 


152-0141-02 


B010100 


B099999X 


SEMICOND 


DEVICE: SILICON, 30V, 150MA 


01295 


1N4152R 



(R7844 ONLY) 



REV OCT 1981 



8-33 



Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No, 

Eft Dscont 


Name & Description 


Mfr 

Code 


CR1860 


152-0141-02 


B010100 


B109999X 


SEMICOND DEVICE : SILICON, 30V , 1 50MA 


01295 










(7844 ONLY) 




CR1862 


152-0269-00 


B010100 


B010135 


SEMICOND DEVICE: SILICON, VAR VCAP . ,4V, 33PF 


04713 










(7844 ONLY) 




CR1862 


152-0270-00 


B010136 


B109999X 


SEMICOND DEVICE: SILICON, 56PF AT 4V 


04713 










(7844 ONLY) 




CR1862 


152-0269-00 


B010100 


B010112 


SEMICOND DEVICE : SILICON , VAR VCAP . , 4V , 33PF 


04713 










(R7844 ONLY) 




CR1862 


152-0270-00 


B010113 


B099999X 


SEMICOND DEVICE: SILICON, 56PF AT 4V 


04713 










(R7844 ONLY) 




CR1866 


152-0141-02 


B010100 


B099999X 


SEMICOND DEVICE : SILICON ,30V, 150MA 


01295 










(R7844 ONLY) 




CR1866 


152-0141-02 


B010100 


B109999X 


SEMICOND DEVICE : SILICON ,30V, 150MA 


01295 










(7844 ONLY) 




CR1870 


152-0141-02 


B010100 


B099999X 


SEMICOND DEVICE : SILICON, 30V, 150MA 


01295 










(R7844 ONLY) 




CR1870 


152-0141-02 


B010100 


B109999X 


SEMICOND DEVICE : SILICON, 30V , 150MA 


01295 










(7844 ONLY) 




CR1882 


152-0141-02 


B010100 


B099999X 


SEMICOND DEVICE : SILICON , 30V , 150MA 


01295 










(R7844 ONLY) 




CR1882 


152-0141-02 


B010100 


B109999X 


SEMICOND DEVICE: SILICON, 30V, 150MA 


01295 










(7844 ONLY) 




CR2044 


152-0141-02 






SEMICOND DEVICE : SILICON , 30V , 1 50MA 


01295 


CR2050 


152-0061-00 






SEMICOND DEVICE: SILICON, 1 75V, 100MA 


07263 


CR2064 


152-0233-00 






SEMICOND DEVICE : SILICON ,85V, 100MA 


80009 


CR2124 


152-0141-02 






SEMICOND DEVICE: SILICON, 30V, 150MA 


01295 


CR2125 


152-0141-02 






SEMICOND DEVICE : SILICON , 30V, 150MA 


01295 


CR2127 


152-0141-02 






SEMICOND DEVICE: SILICON, 30V, 150MA 


01295 


CR2140 


152-0141-02 






SEMICOND DEVICE: SILICON, 30V, 150MA 


01295 


CR2141 


152-0141-02 






SEMICOND DEVICE: SILICON, 30V, 150MA 


01295 


CR2142 


152-0141-02 






SEMICOND DEVICE : SILICON, 30V, 1 50MA 


01295 


CR2145 


152-0141-02 






SEMICOND DEVICE : SILICON , 30V , 1 50MA 


01295 


CR2146 


152-0141-02 






SEMICOND DEVICE : SILICON, 30V, 1 50MA 


01295 


CR2156 


152-0141-02 






SEMICOND DEVICE: SILICON, 30V, 150MA 


01295 


CR2157 


152-0141-02 






SEMICOND DEVICE: SILICON, 30V ,150MA 


01295 


CR2162 


152-0141-02 






SEMICOND DEVICE : SILICON , 30V , 150MA 


01295 


CR2163 


152-0141-02 






SEMICOND DEVICE: SILICON, 30V.150MA 


01295 


CR2166 


152-0141-02 






SEMICOND DEVICE : SILICON, 30V , 150MA 


01295 


CR2167 


152-0141-02 






SEMICOND DEVICE : SILICON, 30V, 150MA 


01295 


CR2170 


152-0141-02 






SEMICOND DEVICE: SILICON, 30V, 150MA 


01295 


CR2171 


152-0141-02 






SEMICOND DEVICE : SILICON, 30V, 150MA 


01295 


CR2174 


152-0141-02 






SEMICOND DEVICE : SILICON ,30V, 150MA 


01295 


CR2175 


152-0141-02 






SEMICOND DEVICE : SILICON, 30V, 150MA 


01295 


CR2192 


152-0141-02 






SEMICOND DEVICE : SILICON, 30V, 150MA 


01295 


CR2193 


152-0141-02 






SEMICOND DEVICE : SILICON, 30V, 150MA 


01295 


CR2196 


152-0141-02 






SEMICOND DEVICE : SILICON, 30V, 150MA 


01295 


CR2198 


152-0141-02 






SEMICOND DEVICE : SILICON, 30V, 1 50MA 


01295 


CR2226 


152-0141-02 






SEMICOND DEVICE: SILICON, 30V ,150MA 


01295 


CR2235 


152-0333-00 


XB080000 




SEMICOND DEVICE : SILICON , 55V, 200MA 


07263 










(7844 ONLY) 





THRU 



CR2266 

CR2235 152-0333-00 XB090000 SEMICOND DEVICE:S1LICON,55V,200MA 07263 

(R7844 ONLY) 

THRU 

CR2266 



8-34 



Mfr Part Number 



1N4152R 

SMV1263 

SMV1563 



SMV1263 

SMV1563 

1N4152R 



1N4152R 

1N4152R 

1N4152R 



1N4152R 

1N4152R 

1N4152R 

FDH2161 

152-0233-00 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

FDH-601 2 



FDH-6012 



REV OCT 1981, 





Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 
Ckt No. Part No. Eft Dscont 



CR2306 


152-0409-00 






CR2312 


152-0409-00 






CR2322 


152-0242-00 






CR2323 


152-0242-00 






CR2324 


152-0242-00 






CR2325 


152-0242-00 






CR2332 


152-0242-00 






CR2333 


152-0242-00 






CR2334 


152-0242-00 






CR2335 


152-0242-00 






CR2342 


152-0242-00 






CR2343 


152-0242-00 






CR2344 


152-0242-00 






CR2345 


152-0242-00 






CR2352 


152-0242-00 






CR2353 


152-0242-00 






CR2354 


152-0242-00 






CR2355 


152-0242-00 






CR2423 


152-0107-00 






CR2443 


152-0107-00 






CR2446 


152-0061-00 






CR2450 


152-0141-02 






CR2460 


152-0141-02 






CR2466 


152-0141-02 






CR2467 


152-0141-02 






CR2476 


152-0061-00 






CR2480 


152-0141-02 






CR2489 


152-0242-00 


XB030000 




CR2489 


152-0242-00 


XB020000 




CR2490 


152-0141-02 






CR2492 


152-0141-02 






CR2495 


152-0141-02 






CR2497 


152-0141-02 






CR2499 


152-0141-02 






CR2528 


152-0107-00 






CR2531 


152-0141-02 






CR2532 


152-0141-02 






CR2534 


152-0141-02 






CR2537 


152-0141-02 






CR2538 


152-0107-00 






CR2690 


152-0501-00 






CR2692 


152-0141-02 






CR2702 


152-0141-02 






CR2704 


152-0141-02 






CR2787 


152-0141-02 


XB020000 


B039999X 


CR2787 


152-0141-02 


XB020000 


B029999X 


CR2834 


152-0141-02 


B010100 


B099999X 


CR2834 


152-0141-02 


B010100 


B109999X 


CR2836 


152-0141-02 


BO 10100 


B099999X 



Name & Description 



SEMICOND DEVICE : SILICON, 12 , OOOV , 5MA 
SEMICOND DEVICE : SILICON ,12, OOOV , 5MA 
SEMICOND DEVICE : S ILICON ,225V, 200MA 
SEMICOND DEVICE : S ILICON , 2 2 5V , 200MA 
SEMICOND DEVICE : S ILICON, 225V , 200MA 

SEMICOND DEVICE : SILICON, 225V, 200MA 
SEMICOND DEVICE : SILICON ,225V, 200MA 
SEMICOND DEVICE : SILICON ,225V, 200MA 
SEMICOND DEVICE : SILICON ,225V, 200MA 
SEMICOND DEVICE : SILICON ,225V, 200MA 
SEMICOND DEVICE: SILICON, 225V, 200MA 

SEMICOND DEVICE : SILICON , 225V , 200MA 
SEMICOND DEVICE : SILICON ,225V, 200MA 
SEMICOND DEVICE : SILI CON , 2 2 5V , 200MA 
SEMICOND DEVICE : SILICON , 225V , 200MA 
SEMICOND DEVICE : SILICON ,225V, 200MA 
SEMICOND DEVICE: SILICON, 225V, 200MA 

SEMICOND DEVICE : SILICON , 225V, 200MA 
SEMICOND DEVICE: SILICON, 400V, 400MA 
SEMICOND DEVICE : SILICON , 400V , 400MA 
SEMICOND DEVICE : SILICON , 1 75V , 1 OOMA 
SEMICOND DEVICE: SILICON, 30V, 150MA 
SEMICOND DEVICE: SILICON, 30V, 150MA 

SEMICOND DEVICE: SILICON, 30V, 150MA 
SEMICOND DEVICE : SILICON, 30V, 150MA 
SEMICOND DEVICE : SILICON, 1 75V , 100MA 
SEMICOND DEVICE : SILICON, 30V , 1 50MA 
SEMICOND DEVICE : SILICON ,225V, 200MA 
(7844 ONLY) 

SEMICOND DEVICE : SILICON ,225V, 200MA 
(R7844 ONLY) 

SEMICOND DEVICE : SILICON, 30V , 150MA 
SEMICOND DEVICE : SILICON , 30V , 150MA 
SEMICOND DEVICE: SILICON, 30V, 150MA 
SEMICOND DEVICE : SILICON, 30V , 150MA 

SEMICOND DEVICE : SILICON, 30V, 150MA 
SEMICOND DEVICE : SILICON , 400V , 400MA 
SEMICOND DEVICE : SILICON , 30V , 150MA 
SEMICOND DEVICE: SILICON, 30V, 150MA 
SEMICOND DEVICE : SILICON, 30V , 150MA 
SEMICOND DEVICE: SILICON, 30V, 150MA 

SEMICOND DEVICE : SILICON , 400V , 400MA 
SEMICOND DEVICE .’SILICON, 70V.200MA 
SEMICOND DEVICE: SILICON, 30V, 150MA 
SEMICOND DEVICE : SILICON, 30V, 150MA 
SEMICOND DEVICE : SILICON, 30V, 150MA 
SEMICOND DEVICE: SILICON, 30V, 150MA 
(7844 ONLY) 

SEMICOND DEVICE : SILICON, 30V, 150MA 
( R7844 ONLY) 

SEMICOND DEVICE: SILICON, 30V, 150MA 
(R7844 ONLY) 

SEMICOND DEVICE : S ILICON, 30 V, 150MA 
(7844 ONLY) 

SEMICOND DEVICE : SILICON , 30V, 1 SOMA 
(R7844 ONLY) 



Mfr 

Code Mfr Part Number 



80009 152-0409-00 

80009 152-0409-00 

07263 FDH5004 

07263 FDH5004 

07263 FDH5004 

07263 FDH5004 

07263 FDH5004 

07263 FDH5004 

07263 FDH5004 

07263 FDH5004 

07263 FDH5004 

07263 FDH5004 

07263 FDH5004 

07263 FDH5004 

07263 FDH5004 

07.263 FDH5004 

07263 FDH5004 

07263 FDH5004 

01295 G727 

01295 G727 

07263 FDH2161 

01295 1N4152R 

01295 1N4152R 

01295 1N4152R 

01295 1N4152R 

07263 FDH2161 

01295 1N4152R 

07263 FDH5004 



07263 FDH5004 

01295 1N4152R 

01295 1N4152R 

01295 1N4152R 

01295 1N4152R 

01295 1N4152R 

01295 G727 

01295 1N4152R 

01295 1N4152R 

01295 1N4152R 

01295 1N4152R 

01295 G727 

04713 SSD2405 

01295 1N4152R 

01295 1N4152R 

01295 1N4152R 

01295 1N4152R 



01295 1N4152R 
01295 1N4152R 
01295 1N4152R 



01295 1N4152R 



REV OCT 1981 



8-35 



Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No, 


Tektronix 
Part No. 


Serial/Model No. 

Eft Dscont 


Name & Description 


Mfr 

Code 


CR2836 


152-0141-02 


B010100 


B109999X 


SEMICOND DEVICE : SILICON, 30V , 150MA 
(7844 ONLY) 

SEMICOND DEVICE: SILICON, 15V, 50MA 
(R7844 ONLY) 

SEMICOND DEVICE : SILICON, 15V , 50MA 
(7844 ONLY) 


01295 


CK2842 


152-0153-00 


B010100 


B099999X 


07263 


CR2842 


152-0153-00 


B010100 


B109999X 


07263 












CR2852 


152-0153-00 


B010100 


B099999X 


SEMICOND DEVICE : SILICON, 15V , 50MA 
( R7844 ONLY) 

SEMICOND DEVICE: SILICON, 15V, 50MA 
(7844 ONLY) 

SEMICOND DEVICE : SILICON, 30V , 150MA 
(R7844 ONLY) 


07263 


CR2852 


152-0153-00 


B010100 


B109999X 


07263 


CR2860 


152-0141-02 


B010100 


B099999X 


01295 












CR2860 


152-0141-02 


B010100 


B109999X 


SEMICOND DEVICE : SILICON, 30V, 150MA 
(7844 ONLY) 

SEMICOND DEVICE: SILICON, VAR VCAP . ,4V, 33PF 
(7844 ONLY) 

SEMICOND DEVICE: SILICON, 56PF AT 4V 
(7844 ONLY) 


01295 


CR2862 


152-0269-00 


B010100 


B010134 


04713 


CR2862 


152-0270-00 


B010135 


B109999X 


04713 












CR2862 


152-0269-00 


B010100 


B010112 


SEMICOND DEVICE : SILICON , VAR VCAP. ,4V, 33PF 
(7844 ONLY) 

SEMICOND DEVICE : SILICON, 56PF AT 4V 
( R7844 ONLY) 

SEMICOND DEVICE: SILICON, 30V, 150MA 
( R7844 ONLY) 


04713 


CR2862 


152-0270-00 


B010113 


B099999X 


04713 


CR2866 


152-0141-02 


B010100 


B099999X 


01295 












CR2866 


152-0141-02 


B010100 


B109999X 


SEMICOND DEVICE : SILICON , 30V, 150MA 
(7844 ONLY) 

SEMICOND DEVICE: SILICON, 30V, 150MA 
(R7844 ONLY) 

SEMICOND DEVICE: SILICON, 30V, 150MA 
(7844 ONLY) 


01295 


CR2870 


152-0141-02 


B010100 


B099999X 


01295 


CR2870 


152-0141-02 


B010100 


B109999X 


01295 












CR2882 


152-0141-02 


B010100 


B099999X 


SEMICOND DEVICE: SILICON, 30V, 150MA 
( R7844 ONLY) 

SEMICOND DEVICE : SILICON, 30V, 150MA 
(7844 ONLY) 

SEMICOND DEVICE : SILICON, 30V , 150MA 
(CR3155, 7844/R7844 ONLY) 


01295 


CR2882 


152-0141-02 


B010100 


B109999X 


01295 


CR3135 


152-0141-02 






01295 












CR3156 


152-0141-02 






SEMICOND DEVICE: SILICON, 30V, 150MA 
(CR3156, 7844/R7844 ONLY) 

SEMICOND DEVICE : SILICON, 30V, 150MA 
(CR3160, 7844/R7844 ONLY) 

SEMICOND DEVICE : SILICON, 30V, 150MA 
(CR3168 , 7844/R7844 ONLY) 


01295 


CR3160 


152-0141-02 






01295 


CR3168 


152-0141-02 






01295 












CR3169 


152-0141-02 






SEMICOND DEVICE: SILICON, 30V, 150MA 
(CR3169 , 7844/R7844 ONLY) 

SEMICOND DEVICE: SILICON, 30V, 150MA 
(CR3172, 7844/R7844 ONLY) 

SEMICOND DEVICE: SILICON, 30V, 150MA 
(CR3176, 7844/R7844 ONLY) 


01295 


CR3172 


152-0141-02 






01295 


CR3176 


152-0141-02 






01295 












CR3177 


152-0141-02 






SEMICOND DEVICE : SILICON, 30V, 150MA 
(CR3177 , 7844/R7844 ONLY) 

SEMICOND DEVICE : SILICON, 30V , 150MA 
(CR3178 , 7844/R7844 ONLY) 

SEMICOND DEVICE : SILICON, 30V, 150MA 
(CR3179, 7844/R7844 ONLY) 


01295 


CR3178 


152-0141-02 






01295 


CR3179 


152-0141-02 






01295 












CR3183 


152-0141-02 






SEMICOND DEVICE: SILICON, 30V, 150MA 
(CR3183 , 7844/R7844 ONLY) 

SEMICOND DEVICE: SILICON, 30V.150MA 
(CR3184 , 7844/R7844 ONLY) 


01295 


CR3184 


152-0141-02 






01295 



Mfr Part Number 

1N4152R 

FD7003 

FD7003 

FD7003 

FD7003 

1N4152R 

1N4152R 

SMV1263 

SMV1563 

SMV1263 

SMV1563 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4152R 

1N4132R 



8-36 



REV OCT 1981 





Replaceable Electrical Parts — 7844/R7844 Service 



Ckl No. 



Tektronix Serial/Model No. 
Part No. Eft Dscont 



Name & Description 



Mfr 

Code Mfr Part Number 



CR3694 


152-0141-02 




CR3794 


152-0141-02 




CR4101 


152-0141-02 




CR4102 


152-0141-02 




CR4119 


152-0075-00 




CR4125 


152-0141-02 




CR4138 


152-0075-00 




CR4143 


152-0141-02 




CR4156 


152-0141-02 




CR4162 


152-0141-02 




CR4172 


152-0141-02 




CR4180 


152-0075-00 


B010100 


CR4180 


152-0141-02 


B1 10000 


CR4181 


152-0141-02 


XB110000 


CR4185 


152-0141-02 




CR4850 


152-0141-02 


XB100000 


CR4850 


152-0141-02 


XB 110000 


CR4860 


152-0141-02 


XB100000 


CR4860 


152-0141-02 


XB110000 


CR4862 


152-0141-02 


XB100000 


CR4862 


152-0141-02 


XB 11 0000 


CR4863 


152-0141-02 


XB100000 


CR4863 


152-0141-02 


XB1 10000 


CR5850 


152-0141-02 


XB100000 


CR5850 


152-0141-02 


XB1 10000 


CR5860 


152-0141-02 


XB 100000 


CR5860 


152-0141-02 


XB 11 0000 


CR5862 


152-0141-02 


XB100000 



B109999 



SEMICOND DEVICE : SILICON , 30V, 150MA 
(CR3694, 7844/R7844 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON , 30V , 1 50MA 
(CR3794, 7844/R7844 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON , 30V , 150MA 
(CR4101, OPTION 22 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON , 30V , 1 50MA 
(CR41CI2, OPTION 22 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : GE , 25V.40MA 
(CR4119, OPTION 22 ONLY) 


14433 


G866 


SEMICOND DEVICE: SILICON, 30V, 150MA 
(CR4125, OPTION 22 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE :GE, 25 V.40MA 
(CR4138 , OPTION 22 ONLY) 


14433 


G866 


SEMICOND DEVICE : SILICON , 30V , 1 50MA 
(CR4143 , OPTION 22 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON, 30V, 150MA 
(CR4156 , OPTION 22 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON , 30V , 1 50MA 
(CR4102, OPTION 22 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON , 30V , 150MA 
(CR4172 , OPTION 22 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE :GE , 25V.40MA 
(OPTION 22 ONLY) 


14433 


G866 


SEMICOND DEVICE : SILICON , 30V , 1 50MA 
(OPTION 22 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON, 30V, 150MA 
(CR4181 , OPTION 22 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON , 30V , 1 50MA 
(CR4185, OPTION 22 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : S ILI CON , 30V , 1 50MA 
(R7844 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON , 30V , 1 50MA 
(7844 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON , 30V , 1 50MA 
(R7844 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON, 30V, 1 50MA 
(7844 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON , 30V , 1 50MA 
(R7844- ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON , 30V , 1 50MA 
(7844 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON , 30V , 1 50MA 
(R7844 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON , 30V , 1 50MA 
(7844 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON , 30V , 1 50MA 
(R7844 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON , 30V , 1 50MA 
(7844 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE: SILICON, 30V, 150MA 
(R7844 ONLY) 


01295 


1N4152R 


SEMICOND DEVICE : SILICON , 30V , 1 50MA 


01295 


1N4152R 


(7844 ONLY) 






SEMICOND DEVICE : SILICON , 30V , 1 50MA 
(R7844 ONLY) 


01295 


1N4152R 



REV OCT 1981 



8-37 





Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eft Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Number 


CR5862 


152-0141-02 


XBl 10000 


SEMICOND DEVICE : SILICON, 30V , 1 50MA 
(7844 ONLY) 


01295 


1N4152R 


CR5863 


152-0141-02 


XB100000 


SEMICOND DEVICE : SILICON, 30V , 150MA 
(R7844 ONLY) 


01295 


1N4152R 


CR5863 


152-0141-02 


XBl 10000 


SEMICOND DEVICE: SILICON, 30V, 150MA 
(7844 ONLY) 


01295 


1N4152R 


DL1650 


119-0471-00 




DELAY LINE, ELEC :65NS, 100 OHM 
(DL1650, R7844 ONLY) 


80009 


119-0471-00 


DL2650 


119-0470-00 




DELAY LINE, ELEC: 
(DL2650 , 7844 ONLY) 


80009 


119-0470-00 


DS87 


150-0029-00 




LAMP , 1NCAND : 6 . 3V,0 . 20A 


08806 


349 


DS88 


150-0029-00 




LAMP , INCAND : 6 . 3 V , 0 . 20A 


08806 


349 


DS89 


150-0029-00 




LAMP , INCAND : 6 . 3V , 0 . 20A 


08806 


349 


DS980 


150-0121-02 




LAMP , CARTRIDGE : GREEN , 5V, 60MA 
(7844 ONLY) 


80009 


150-0121-02 


DS990 


150-0097-01 




LAMP , INCAND : 6 . 3V , 0 . 2A,#738 1 , FROSTED 
( R7844 ONLY) 


08806 


7381F 


DS1219 


150-0035-00 




LAMP, GLOW :90V, 0.3MA 


53944 


A1B-3 


DS2326 


150-0035-00 




LAMP , GLOW :90V, 0.3MA 


53944 


A1B-3 


DS2327 


150-0035-00 




LAMP, GLOW: 90V, 0.3MA 


53944 


A1B-3 


DS2336 


150-0035-00 




LAMP, GLOW: 90V, 0.3MA 


53944 


A1B-3 


DS2337 


150-0035-00 




LAMP, GLOW: 90V, 0.3MA 


53944 


A1B-3 


DS2400 


150-0030-00 




LAMP, GLOW: NEON, T-2, 60 TO 90 VOLTS 


74276 


NE2V-T 


DS2401 


150-0030-00 




LAMP, GLOW : NEON, T-2, 60 TO 90 VOLTS 


74276 


NE2V-T 


DS2402 


150-0030-00 




LAMP, GLOW: NEON, T-2, 60 TO 90 VOLTS 


74276 


NE2V-T 


DS2403 


150-0030-00 




LAMP , GLOW : NEON , T-2 , 60 TO 90 VOLTS 


74276 


NE2V-T 


E1208 


119-0181-00 




ARSR.ELEC SURGE : 230V, GAS FILLED 


80009 


119-0181-00 


E1213 


119-0181-00 




ARSR.ELEC SURGE : 230V, GAS FILLED 


80009 


119-0181-00 


F1200 


159-0017-00 




FUSE , CARTRIDGE : 3AG , 4A , 250V , FAST BLOW 


71400 


MTH4 


FI 700 


159-0090-00 




FUSE , CARTRIDGE : 0 . 25A , 1 2 5V , FAST-BLOW 


71400 


GAF 1/4 


F2700 


159-0090-00 




FUSE , CARTRIDGE : 0 . 25A , 1 25V , FAST-BLOW 


71400 


GAF 1/4 


FL1200 


119-0420-00 




FILTER , RI'1 : 6A , 250VAC , 400HZ 


02777 


F-l 1935-6 


J4 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J6 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J16 


131-1003-00 




CONN, RCPT ,ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J23 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J25 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J26 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J48 


131-1003-00 




CONN , RCPT , ELEC : CKT BD MT,3 PRONG 


80009 


131-1003-00 


J51 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J52 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J53 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J54 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J67 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J168 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J330 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J331 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J339 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J370 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J372 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J410 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J414 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J433 


131-1003-00 




CONN , RCPT , ELEC : CKT BD MT,3 PRONG 


80009 


131-1003-00 


J451 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 


J510 


131-1003-00 




CONN, RCPT, ELEC: CKT BD MT,3 PRONG 


80009 


131-1003-00 



8-38 



REV OCT 1981, 





Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eff 


Dscont 


J514 

J534 

J552 

J601 


131-1003-00 

131-1003-00 

131-1003-00 

131-1003-00 


B010100 


B110794X 


J601 


131-1003-00 


B010100 


B100399X 


J602 


131-1003-00 


B010100 


B110794X 


J602 


131-1003-00 


B010100 


B100399X 


J641 


131-1003-00 


B010100 


B110794X 


J641 


131-1003-00 


B010100 


B100399X 


J642 


131-1003-00 


B010100 


B110794X 


J642 


131-1003-00 


B010100 


B100399X 


J701 


131-1003-00 


B010100 


8110794X 


J701 


131-1003-00 


B010100 


B100399X 


J702 


131-1003-00 


B010100 


B110794X 


J702 


131-1003-00 


B010100 


B100399X 


J738A 


131-1003-00 


B010100 


B110794X 


J738A 


131-1003-00 


BO 10100 


B100399X 


J738B 


131-1003-00 


B010100 


B110794X 


J738B 


131-1003-00 


B010100 


B100399X 


J738C 


131-1003-00 


B010100 


B110794X 


J738C 


131-1003-00 


B010100 


B100399X 


J738D 


131-1003-00 


B010100 


B110794X 


J738D 


131-1003-00 


B010100 


B100399X 


J743 


131-1003-00 


B010100 


B110794X 


J743 


131-1003-00 


B010100 


B100399X 


J744 


131-1003-00 


B010100 


B110794X 


J744 


131-1003-00 


B010100 


B100399X 


J810 

J820 

J838A 

J838B 


131-1003-00 

131-1003-00 

131-1003-00 

131-1003-00 






J840 

J850 


131-1003-00 

131-1003-00 







Mfr 

Name & Description Code Mfr Part Number 



CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(R7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(R7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(R7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(R7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(R7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(R7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(R7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(R784^- OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, EiCPT, ELEC: CKT BD MT,3 
(7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(R7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(R7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC :CKT BD MT,3 
(7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(R7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
(7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 
( R7844 OPTION 21 ONLY) 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC:CKT BD MT,3 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 



REV OCT 1981 



8-39 




Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eff Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Number 


J982 


131-0771-00 






CONN , RCPT , ELEC : 4 CONT, QUICK DISCONNECT 


0000A 


R0A-304NYL 


J984 


131-1315-00 






CONN , RCPT , ELEC : BNC , FEMALE 




80009 


131-1315-00 


J992 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J993 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J998 


131-0771-00 






CONN, RCPT, ELEC: 4 CONT, QUICK DISCONNECT 


0000A 


R0A-304NYL 


J1004 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1006 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1016 


131-0955-00 






CONN , RCPT , ELEC : BNC , FEMALE 




13511 


31-279 










(J1016, R7844 ONLY) 








J1023 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1025 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1031 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1035 


131-0955-00 






CONN , RCPT , ELEC : BNC , FEMALE 




13511 


31-279 










( J1035 , E.7844 ONLY) 








J1048 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1058 


131-0955-00 






CONN , RCPT , ELEC : BNC , FEMALE 




13511 


31-279 


J1067 


131-1003-00 






CONN, RCPI , ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1072 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1077 


131-0955-00 






CONN , RCPI , ELEC : BNC , FEMALE 




13511 


31-279 










( J1077 , B.7844 ONLY) 








J1081 


131-0955-00 






CONN , RCPI , ELEC : BNC , FEMALE 




13511 


31-279 










( J1081 , R7844 ONLY) 








J1082 


131-0955-00 






CONN, RCPI ,ELEC: BNC, FEMALE 




13511 


31-279 










( J1082 , F7844 ONLY) 








J1091 


131-0955-00 






CONN , RCPI , ELEC : BNC , FEMALE 




13511 


31-279 










( J1091 , F 7844 ONLY) 








J1093 


131-0955-00 






CONN , RCPI , ELEC : BNC , FEMALE 




13511 


31-279 










( J1093 , F7844 ONLY) 








J1095 


131-0955-00 






CONN , RCPI , ELEC : BNC , FEMALE 




13511 


31-279 










(J1095, E 7844 ONLY) 








J1099 


131-0955-00 






CONN , RCPI , ELEC : BNC , FEMALE 




13511 


31-279 










( J1099 , F 7844 ONLY) 








J1131 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1132 


131-1003-00 






CONN, RCPI, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1660 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1661 


131-1003-00 






CONN, RCPI, ELEC:CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1690 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1738 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1799 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1810 


131-1003-00 


B010100 


B099999X 


CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1810 


131-1003-00 


B010100 


B109999X 


CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1820 


131-1003-00 


B010100 


B099999X 


CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1820 


131-1003-00 


B010100 


B109999X 


CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1868 


131-1003-00 


B010100 


B099999X 


CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J1868 


131-1003-00 


B010100 


B109999X 


CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J2032 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J2072 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J2132 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J2138 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J2139 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J2192 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J2296 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J2299 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J2438 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J2660 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J2661 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


J2690 


131-1003-00 






CONN , RCPT , ELEC : CKT BD MT,3 


PRONG 


80009 


131-1003-00 



8-40 



REV OCT 1981. 





Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 



Tektronix Serial/Model No. 
Part No. Eff Dscont 



Name & Description 



Mfr 

Code Mfr Part Number 



J2738 

J2799 

J2810 

J2810 

J2820 

J2820 

J2838 

J2838 

J2896 

J2896 

J3168 

J3601 

J3602 

J3641 

J3642 

J3701 

J3702 

J3738A 

J3738B 

J3738C 

J3738D 

J3743 

J3744 

J4132A 

J4132B 

J4138A 

J4138B 

J4139A 

J4139B 

J4192A 



131-1003-00 

131-1003-00 

131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 



131-1003-00 







CONN, FtCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 






CONN ,F:CPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 


B010100 


B099999X 


CONN .F1CPT, ELEC: CKT BD MT,3 
(R7844 ONLY) 


PRONG 


80009 


131-1003-00 


B010100 


B109999X 


CONN, RCPT, ELEC: CKT BD MT,3 
(7844 ONLY) 


PRONG 


80009 


131-1003-00 


B010100 


B099999X 


CONN, FtCPT, ELEC: CKT BD MT,3 
(R7844 ONLY) 


PRONG 


80009 


131-1003-00 


B010100 


B109999X 


CONN, FtCPT, ELEC: CKT BD MT,3 
(7844 ONLY) 


PRONG 


80009 


131-1003-00 


B010100 


B099999X 


CONN, ItCPT, ELEC: CKT BD MT,3 
(R7849 ONLY) 


PRONG 


80009 


131-1003-00 


B010100 


B109999X 


CONN, RCPT, ELEC: CKT BD MT,3 
(7844 ONLY) 


PRONG 


80009 


131-1003-00 


B010100 


B099999X 


CONN, ItCPT, ELEC: CKT BD MT,3 
( R7849 ONLY) 


PRONG 


80009 


131-1003-00 


B010100 


B109999X 


CONN, RCPT, ELEC: CKT BD MT,3 
(7844 ONLY) 


PRONG 


80009 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 






( J3168 , 7844/R7844 ONLY) 
CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 






(J3601, 7844/R7844 ONLY) 
CONN, RCPT, ELEC: CKT BD MT , 3 
( J3602, 7844/R7844 ONLY) 


PRONG 


80009 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 






(J3641, 7844/R7844 ONLY) 
CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 






(J3642, 7844/R7844 ONLY) 
CONN, RCPT, ELEC: CKT BD MT,3 
( J 3 7 0 1 , 7844/R7844 ONLY) 


PRONG 


80009 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 






( J3702 , 7844/R7844 ONLY) 
CONN, RCPT, ELEC: CKT BD MT,3 
( J3738A, 7844/R7844 ONLY) 


PRONG 


80009 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 
(J3738B, 7844/R7844 ONLY) 


PRONG 


80009 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 






(J3738C, 7844/R7844 ONLY) 
CONN, RCPT, ELEC: CKT BD MT,3 
( J3738D, 7844/R7844 ONLY) 


PRONG 


80009 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 
(J3743, 7844/R7844 ONLY) 


PRONG 


80009 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 






( J3744 , 7844/R7844 ONLY) 
CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 






( J4132A, OPTION 22 ONLY) 
CONN, RCPT, ELEC: CKT BD MT,3 
(J4132B, OPTION 22 0|^Y) 


PRONG 


80009 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 






( J4133A, OPTION 22 ONLY) 
CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 






(J4133B, OPTION 22 ONLY) 
CONN, [RCPT, ELEC: CKT BD MT,3 
( J4139A, OPTION 22 ONLY) 


PRONG 


80009 


131-1003-00 






CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 






( J4139B, OPTION 22 ONLY) 
CONN, RCPT, ELEC: CKT BD MT,3 


PRONG 


80009 


131-1003-00 



(J4192A, OPTION 22 ONLY) 



REV OCT 1981 



8-41 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix 
Ckt No. Part No. 



Serial/Model No. 

Eft Dscont 



Name & Description 



Mtr 

Code Mtr Part Number 



J4192B 


131-1003-00 




J4196A 


131-1003-00 




J4196B 


131-1003-00 




J4199A 


131-1003-00 




J4199B 


131-1003-00 




J4810 


131-1003-00 


XB100000 


J4810 


131-1003-00 


XB1 10000 


J4820 


131-1003-00 


XB100000 


J4820 


131-1003-00 


XB110000 


J4868 


131-1003-00 


XB100000 


J4868 


131-1003-00 


XB110000 


J5838 


131-1003-00 


XB100000 


J5838 


131-1003-00 


XB 110000 


J5840 


131-1003-00 


XB100000 


J 5840 


131-1003-00 


XB110000 


J5850 


131-1003-00 


XB100000 


J5850 


131-1003-00 


XB1 10000 


J5896 


131-1003-00 


XB100000 


J5896 


131-1003-00 


XB110000 


K4185 


148-0034-00 




L391 


108-0245-00 




L393 


108-0245-00 




L395 


108-0245-00 




L396 


108-0245-00 




L397 


108-0245-00 




L421 


108-0736-00 




L422 


108-0736-00 




L451 


108-0736-00 




L452 


108-0736-00 




L521 


108-0736-00 




L522 


108-0736-00 




L551 


108-0736-00 




L552 


108-0736-00 




L59 1 


108-0245-00 




L593 


108-0245-00 





CONN, RCPT, ELEC: CKT 


BD MT , 3 


PRONG 


80009 


131-1003-00 


( J4192B , OPTION 22 


ONLY) 








CONN, RCPT, ELEC: CKT 


BD MT, 3 


PRONG 


80009 


131-1003-00 


( J4196A, OPTION 22 


ONLY) 








CONN, RCPT, ELEC: CKT 


BD MT , 3 


PRONG 


80009 


131-1003-00 


( J4196B, OPTION 22 


ONLY) 








CONN, RCPT, ELEC: CKT 


BD MT, 3 


PRONG 


80009 


131-1003-00 


( J4199A, OPTION 22 


ONLY) 








CONN, RCPT, ELEC: CKT 


BD MT , 3 


PRONG 


80009 


131-1003-00 


( J4199B, OPTION 22 


ONLY) 








CONN, RCPT, ELEC: CKT 
( R7844 ONLY) 


BD MT,3 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT 
(7844 ONLY) 


BD MT , 3 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT 


BD MT , 3 


PRONG 


80009 


131-1003-00 


(R7844 ONLY) 

CONN, RCPT, ELEC: CKT 
(7844 ONLY) 


BD MT , 3 


PRONG 


80009 


131-1003-00 


CONN, RC PT , ELEC: CKT 


BD MT , 3 


PRONG 


80009 


131-1003-00 


(R7844 ONLY) 

CONN, RCPT, ELEC: CKT 


BD MT, 3 


PRONG 


80009 


131-1003-00 


(7844 ONLY) 

CONN, RCPT, ELEC: CKT 
(R7844 ONLY) 


BD MT,3 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT 
(7844 ONLY ) 


BD MT, 3 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT 
(R7844 ONLY) 


BD MT, 3 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT 
(7844 ONLY) 


BD MT, 3 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT 


BD MT,3 


PRONG 


80009 


131-1003-00 


(R7844 ONLY) 

CONN, RCPT, ELEC: CKT 


BD MT, 3 


PRONG 


80009 


131-1003-00 


(7844 ONI.Y) 

CONN, RCPT, ELEC: CKT 
( R7844 ONLY) 


BD MT , 3 


PRONG 


80009 


131-1003-00 


CONN, RCPT, ELEC: CKT 
(7844 ONI.Y) 


BD MT , 3 


PRONG 


80009 


131-1003-00 


RELAY, ARMATURE :DPDT, 1 5VDC , 600 OHM 


80009 


148-0034-00 


(K4185, OPTION 22 ONLY) 








COIL, RF : 3 . 9UH 






76493 


B6310-1 


COIL , RF : 3 . 9UH 






76493 


B6310-1 


COIL, RF: 3 . 9UH 






76493 


B6310-1 


COIL, RF : 3.9UH 






76493 


B6310-1 


COIL.RF: 3.9UH 






76493 


B6310-1 


COIL,RF:8fONH 






80009 


108-0736-00 


C0IL,RF:810NH 






80009 


108-0736-00 


COIL.RF : 810NH 






80009 


108-0736-00 


COIL.RF : 810NH 






80009 


108-0736-00 


COIL.RF : 810NH 






80009 


108-0736-00 


COIL, RF : 810NH 






80009 


108-0736-00 


COIL.RF: 810NH 






80009 


108-0736-00 


COIL.RF :810NH 






80009 


108-0736-00 


COIL.RF : 3 .9UH 






76493 


B6310-1 


COIL.RF: 3.9UH 






76493 


B6310-1 



8-42 



REV OCT 1981 





Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eft Dscont 


Name & Description 




Mfr 

Code 


Mfr Part Number 


L597 


108-0245-00 






COIL , RF: 3 . 9UH 




76493 


B6310-1 


L791 


108-0245-00 


B010100 


B110794X 


COIL.RF : 3 . 9UH 




76493 


B6310-1 










(7844 OPTION 21 ONLY) 








L791 


108-0245-00 


B010100 


B100399X 


COIL, RF : 3 . 9UH 




76493 


B6310-1 










(R7844 OPTION 21 ONLY) 








L793 


108-0245-00 


B010100 


B110794X 


COIL , RF : 3 . 9UH 




76493 


B6310-1 










(7844 OPTION 21 ONLY) 








L793 


108-0245-00 


B010100 


B100399X 


COIL.RF: 3.9UH 




76493 


B6310-1 










(R7844 OPTION 21 ONLY) 








L880 


108-0245-00 






COIL.RF: 3.9UH 




76493 


B6310-1 


L882 


108-0245-00 






COIL,RF:3.9UH 




76493 


B6310-1 


L916 


108-0440-00 






COIL, RF:8UH, TOROIDAL INDUCTOR 




80009 


108-0440-00 


L1084 


108-0245-00 






COIL , RF : 3. 9UH 




76493 


B6310-1 


L1086 


108-0245-00 






COIL.RF: 3.9UH 




76493 


B6310-1 


L1229 


108-0681-00 






COIL , RF : 140UH 




80009 


108-0681-00 


L1237 


108-0761-00 






COIL.RF: 1MH 




80009 


108-0761-00 


L1313 


108-0679-00 






COIL.RF: 12UH 




80009 


108-0679-00 


L1326 


108-0679-00 






COIL.RF: 12UH 




80009 


108-0679-00 


L1318 


108-0554-00 






COIL.RF: 5UH 




80009 


108-0554-00 


LI 329 


108-0646-00 






COIL, RF : 80UH 




80009 


108-0646-00 


L1352 


108-0680-00 






COIL , RF : 27UH 




80009 


108-0680-00 


LI 355 


108-0680-00 






COIL.RF: 27UH 




80009 


108-0680-00 


L1359 


108-0646-00 






COIL , RF : 80UH 




80009 


108-0646-00 


L1363 


108-0646-00 






COIL , RF : 80UH 




80009 


108-0646-00 


L1660 


108-0369-00 






COIL , RF: 0 . 12UH 




80009 


108-0369-00 


L1661 


108-0369-00 






COIL.RF: 0. 12UH 




80009 


108-0369-00 


L1667 


114-0220-00 






COIL.RF: 1-3UH, CORE 276-0568-00 




80009 


114-0220-00 


L1730 


195-0048-00 






LEAD , ELECTRICAL : 0 . 0 1 8 DIA X 0.75" 


MIN L 


80009 


195-0048-00 


LI 731 


195-0048-00 






LEAD, ELECTRICAL: 0.01 8 DIA X 0.75" 


MIN L 


80009 


195-0048-00 


L1991 


108-0245-00 


B010100 


B099999X 


COIL.RF: 3. 9UH 




76493 


B6310-1 










( R7844 ONLY) 








L1991 


108-0245-00 


B010100 


B109999X 


COIL.RF: 3. 9UH 




76493 


B6310-1 










(7844 ONLY) 








LI 993 


108-0245-00 


B010100 


B099999X 


COIL , RF: 3 . 9UH 




76493 


B6310-1 










(R7844 ONLY) 








L1993 


108-0245-00 


B010100 


B109999X 


COIL , RF : 3. 9UH 




76493 


B6310-1 










(7844 ONLY) 








L1999 


108-0245-00 


B010100 


B099999X 


COIL, RF : 3 . 9UH 




76493 


B6310-1 










( R7844 ONLY) 








L1999 


108-0245-00 


B010100 


B109999X 


COIL , RF : 3 .9UH 




76493 


B6310-1 










(7844 ONLY) 








L2283 


108-0331-00 






COIL , RF : 0 . 75UH 




80009 


108-0331-00 


L2425 


108-0784-00 






COIL, TUBE DEFLE : TRACE ROTATOR 




80009 


108-0784-00 


L2426 


108-0810-00 






COIL, TUBE DEFLE : X-Y ALIGNMENT 




80009 


108-0810-00 


L2582 


108-0245-00 






COIL.RF: 3. 9UH 




76493 


B6310-1 


L2583 


108-0245-00 






COIL.RF: 3. 9UH 




76493 


B6310-1 


L2585 


108-0245-00 






COIL.RF: 3. 9UH 




76493 


B6310-1 


L2586 


108-0245-00 






COIL.RF: 3. 9UH 




76493 


B6310-1 


L2588 


108-0245-00 






COIL.RF: 3. 9UH 




76493 


B6310-1 


L2589 


108-0245-00 






COIL.RF: 3. 9UH 




76493 


B6310-1 


L2591 


108-0245-00 






COIL.RF: 3. 9UH 




76493 


B6310-1 


L2592 


108-0245-00 






COIL.RF: 3. 9UH 




76493 


B6310-1 


L2594 


108-0245-00 






COIL.RF: 3. 9UH 




76493 


B6310-1 


L2595 


108-0245-00 






COIL.RF : 3 . 9UH 




76493 


B6310-1 


L2597 


108-0245-00 






COIL.RF: 3. 9UH 




76493 


B6310-1 


L2660 


108-0369-00 






COIL.RF: 0. 12UH 




80009 


108-0369-00 


L2661 


108-0369-00 






COIL.RF : 0 . 12UH 




80009 


108-0369-00 



REV OCT 1981 



8-43 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eff 


Dscont 


L2667 


114-0220-00 






L2730 


195-0048-00 






L2731 


195-0048-00 






L2991 


108-0245-00 


B010100 


B099999X 


L2991 


108-0245-00 


B010100 


B109999X 


L2993 


108-0245-00 


B010100 


B099999X 


L2993 


108-0245-00 


B010100 


B109999X 


L2999 


108-0245-00 


B010100 


B099999X 


L2999 


108-0245-00 


B010100 


B109999X 


L4848 


276-0507-00 


XB100000 


B100453X 


L4848 


276-0507-00 


XB 11 0000 


B110894X 


L4991 


108-0245-00 


XB100000 




L4991 


108-0245-00 


XB1 10000 




L4993 


108-0245-00 


XB100000 




L4993 


108-0245-00 


XB110000 




L4999 


108-0245-00 


XB100000 




L4999 


108-0245-00 


XB1 10000 




L5848 


276-0507-00 


XB 100000 


B100453X 


L5848 


276-0507-00 


XB110000 


B110894X 


L5991 


108-0245-00 


XB100000 




L5991 


108-0245-00 


XB 11 0000 




L5993 


108-0245-00 


XB100000 




L5993 


108-0245-00 


XB 11 0000 




L5999 


108-0245-00 


XB 100000 




L5999 


108-0245-00 


XB1 10000 




LR1780 


108-0685-00 






LR1784 


108-0685-00 






LR1787 


108-0330-00 






LR1789 


108-0325-00 






LR1791 


108-0325-00 






LR1794 


108-0325-00 






LR1796 


108-0325-00 






LR1798 


108-0325-00 






LR2780 


108-0685-00 






LR2784 


108-0685-00 







Name & Description 



COIL, RF:1-3UH, CORE 276-0568-00 
LEAD, ELECTRICAL: 0.018 DIA X 0.75" MIN L 
LEAD, ELECTRICAL: 0.0 18 DIA X 0.75" MIN L 
COIL.RF : 3 , 9UH 
( R7844 ONLY) 

COIL, RF : 3 . 9UH 
(7844 ONLY) 

COIL.RF: 3. 9UH 
(R7844 ONLY) 

COIL.RF: 3. 9UH 
(7844 ONLY) 

COIL , RF : 3 .9UH 
(R7844 ONLY) 

COIL.RF: 3. 9UH 
(7844 ONLY) 

SHIELDING BEAD, : FERRITE 
(R7844 ONLY) 

SHIELDING BEAD, .-FERRITE 
(7844 ONLY) 

COIL.RF: 3. 9UH 
(R7844 ONLY) 

COIL.RF: 3. 9UH 
(7844 ONLY) 

COIL.RF: 3. 9UH 
( R7844 ONLY) 

COIL.RF: 3. 9UH 
(7844 ONLY) 

COIL.RF: 3. 9UH 
(R7844 ONLY) 

COIL.RF: 3. 9UH 
(7844 ONLY) 

SHIELDING BEAD, : FERRITE 
(R7844 ONLY) 

SHIELDING BEAD, : FERRITE 
(7844 ONLY) 

COIL.RF: 3. 9UH 
(R7844 ONLY) 

COIL.RF: 3. 9UH 
(7844 ONLY) 

COIL.RF: 3. 9UH 
(R7844 ONLY) 

COIL , RF: 3 . 9UH 
(7844 ONLY) 

COIL.RF: 3. 9UH 
(R7844 ONLY) 

COIL.RF: 3. 9UH 
(7844 ONLY ) 

COIL , RF : 80NH 
COIL , RF : 80NH 
COIL.RF : 0 . 4UH 
COIL.RF:!). 5UH 
COIL.RF : l). 5UH 
COIL.RF : i) . 5UH 

COIL.RF:'). 5UH 
COIL.RF: 3. 5UH 
COIL.RF: 30NH 
COIL, RF : 80NH 



Mfr 

Code 


Mfr Part Number 


80009 


114-0220-00 


80009 


195-0048-00 


80009 


195-0048-00 


76493 


B6310-1 


76493 


B6310-1 


76493 


B6310-1 


76493 


B6310-1 


76493 


B6310-1 


76493 


B6310-1 


78488 


57-3443 


78488 


57-3443 


76493 


B6310-1 


76493 


B6310-1 


76493 


B6310-1 


76493 


B6310-1 


76493 


B6310-1 


76493 


B6310-1 


78488 


57-3443 


78488 


57-3443 


76493 


B6310-1 


76493 


B6310-1 


76493 


B6310-1 


76493 


B6310-1 


76493 


B6310-1 


76493 


B6310-1 


80009 


108-0685-00 


80009 


108-0685-00 


80009 


108-0330-00 


80009 


108-0325-00 


80009 


108-0325-00 


80009 


108-0325-00 


80009 


108-0325-00 


80009 


108-0325-00 


80009 


108-0685-00 


80009 


108-0685-00 



8-44 



REV OCT 1981 



Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. Mfr 



Ckt No. 


Part No. 


Eff 


Dscont 


Name & Description 




Code 


Mfr Part Number 


LR2787 


108-0330-00 






COIL , RF : 0 . 4UH 






80009 


108-0330-00 


LR2789 


108-0325-00 






COIL, RF : 0 . 5UH 






80009 


108-0325-00 


LR2791 


108-0325-00 






COIL, E:F : 0 . 5UH 






80009 


108-0325-00 


LR2794 


108-0325-00 






COIL , ELF : 0 . 5UH 






80009 


108-0325-00 


LR2796 


108-0325-00 






COIL.RF : 0 . 5UH 






80009 


108-0325-00 


LR2798 


108-0325-00 






COIL , RF : 0. 5UH 






80009 


108-0325-00 


Q66 


151-0341-00 






TRANSISTOR: SILICON, NPN 






07263 


S040065 


Q86 


151-0341-00 






TRANS ISTOR : S ILICON , NPN 






07263 


S040065 


Q114 


151-0341-00 






TRANS I STOR : S ILICON , NPN 






07263 


S040065 


Q116 


151-0341-00 






TRANSISTOR: SILICON, NPN 






07263 


S040065 


Q220 


151-0199-00 






TRANSISTOR : SILICON , PNP 






04713 


SPS6866K 


Q226 


151-0223-00 






TRANS ISTOR -.SILICON , NPN 






04713 


SPS8026 


Q255 


151-0341-00 






TRANSISTOR: SILICON , NPN 






07263 


S040065 


Q260 


151-0199-00 






TRANS I STOR : SILICON , PNP 






04713 


SPS6866K 


Q266 


151-0223-00 






TRANSISTOR : SILICON , NPN 






04713 


SPS8026 


Q270 


151-0199-00 






TRANS ISTOR : SILICON , PNP 






04713 


SPS6866K 


Q276 


151-0223-00 






TRANS ISTOR: SILICON, NPN 






04713 


SPS8026 


Q286 


151-0188-00 






TRANSISTOR : SILICON , PNP 






04713 


SPS6868K 


Q290 


151-0192-00 


B010100 


B030211X 


TRANS [STOR : SILICON , NPN , SEL 


FROM 


MPS6521 


04713 


SPS8801 










(7844 ONLY) 










Q290 


151-0192-00 


B010100 


B020123X 


TRANS [STOR : SILICON , NPN , SEL 


FROM 


MPS6521 


04713 


SPS8801 










( R 7 844 ONLY) 










Q290 


151-0192-00 


XB120000 




TRANSISTOR : SILICON , NPN , SEL 


FROM 


MPS6521 


04713 


SPS8801 


Q296 


151-0192-00 






TRANS [STOR : SILICON , NPN , SEL 


FROM 


MPS6521 


04713 


SPS8801 


Q304 


151-0341-00 


B010100 


B119999X 


TRANSISTOR : SILICON , NPN 






07263 


S040065 


Q320 


151-0198-00 


B010100 


B030211X 


TRANS [STOR : SILICON , NPN , SEL 


FROM 


MPS918 


04713 


SPS8802-1 










(7844 ONLY) 










Q320 


151-0198-00 


B010100 


B020123X 


TRANS ISTOR : SILICON , NPN , SEL 


FROM 


MPS918 


04713 


SPS8802-1 










(R7844 ONLY) 










Q328 


151-0192-00 






TRANSISTOR : SILICON , NPN , SEL 


FROM MPS6521 


04713 


SPS8801 


Q344 


151-0341-00 


B010100 


B119999X 


TRANSISTOR: SILICON, NPN 






07263 


S040065 


Q360 


151-0198-00 






TRANS ISTOR: SILICON , NPN , SEL 


FROM 


MPS918 


04713 


SPS8802-1 


Q420 


151-0224-00 






TRANSISTOR: SILICON, NPN 






07263 


SA24850 


Q426 


151-0224-00 






TRANSISTOR : S ILICON , NPN 






07263 


SA24850 


Q428 


151-0369-00 






TRANSISTOR: SILICON, PNP 






01295 


SKA6664 


Q430 


151-0369-00 






TRANSISTOR : SILICON , PNP 






01295 


SKA6664 


Q450 


151-0224-00 






TRANSISTOR: SILICON, NPN 






07263 


SA24850 


Q456 


151-0224-00 






TRANSISTOR : SILICON , NPN 






07263 


SA24850 


Q458 


151-0369-00 






TRANS ISTOR -.SILICON, PNP 






01295 


SKA6664 


Q460 


151-0369-00 






TRANSISTOR: SILICON, PNP 






01295 


SKA6664 


Q520 


151-0224-00 






TRANSISTOR : SILICON , NPN 






07263 


SA24850 


Q526 


151-0220-00 






TRANSISTOR: SILICON, PNP 






07263 


S036228 


Q528 


151-0369-00 






TRANS ISTOR: SILICON, PNP 






01295 


SKA6664 


Q530 


151-0369-00 






TRANSISTOR: SILICON, PNP 






01295 


SKA6664 


Q550 


151-0224-00 






TRANSISTOR : SILICON , NPN 






07263 


SA24850 


Q556 


151-0220-00 






TRANSISTOR : SILICON , PNP 






07263 


S036228 


Q558 


151-0369-00 






TRANSISTOR : SILICON , PNP 






01295 


SKA6664 


Q560 


151-0369-00 






TRANSISTOR: SILICON, PNP 






01295 


SKA6664 


Q640 


151-0341-00 


B010100 


B110794X 


TRANSISTOR: SILICON, NPN 






07263 


S040065 










(7844 OPTION 21 ONLY) 










Q640 


151-0341-00 


B010100 


B100399X 


TRANSISTOR: SILICON, NPN 






07263 


S040065 










( R7844 OPTION 21 ONLY) 










Q652 


151-0341-00 


B010100. 


B110794X 


TRANS ISTOR : SILICON , NPN 






07263 


S040065 










(7844 OPTION 21 ONLY) 










Q652 


151-0341-00 


BO 10100 


B100399X 


TRANS ISTOR: SILICON, NPN 






07263 


S040065 










(R7844 OPTION 21 ONLY) 










Q730 


151-0341-00 


B010100 


B110794X 


TRANSISTOR: SILICON, NPN 






07263 


S040065 



(7844 OPTION 21 ONLY) 



REV OCT 1981 



8-45 




Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No, 

Eft Dscont 


Name & Description 




Mfr 

Code 


Mfr Part Number 


Q730 


151-0341-00 


B010100 


B100399X 


TRANS I STOR : SILICON , NPN 




07263 


S040065 










( R7844 OPTION 21 ONLY) 








Q740 


151-0341-00 


B010100 


B110794X 


TRANSISTOR: SILICON, NPN 




07263 


S040065 










(7844 OPTION 21 ONLY) 








Q740 


151-0341-00 


B010100 


B100399X 


TRANSISTOR : SILICON , NPN 




07263 


S040065 










(R7844 OPTION 21 ONLY) 








Q752 


151-0341-00 


B010100 


B110794X 


TRANSISTOR : SILICON , NPN 




07263 


S040065 










(7844 OPTION 21 ONLY) 








Q752 


151-0341-00 


B010100 


B100399X 


TRANSISTOR : SILICON , NPN 




07263 


S040065 










(R7844 OPTION 21 ONLY) 








Q902 


151-0192-00 






TRANSISTOR: SILICON, NPN, SEL FROM 


MPS6521 


04713 


SPS8801 


Q908 


151-0192-00 






TRANSISTOR: SILICON, NPN, SEL FROM 


MPS6521 


04713 


SPS8801 


Q910 


151-0342-00 






TRANSISTOR: SILICON, PNP 




07263 


S035928 


Q944 


151-0508-00 






TRANSISTOR: UJT, SI , 2N6027 ,TO-98 




03508 


2N6027 


Q954 


151-0341-00 






TRANSISTOR: SILICON, NPN 




07263 


S040065 


Q980 


151-0341-00 






TRANSISTOR: SILICON, NPN 




07263 


S040065 


Q994 


151-0342-00 






TRANSISTOR : SILICON , PNP 




07263 


S035928 


Q1010 


151-0223-00 






TRANSISTOR : SILICON , NPN 




04713 


SPS8026 


Q1012 


151-0223-00 






TRANSISTOR : SILICON , NPN 




04713 


SPS8026 


Q1018 


151-0221-00 






TRANS I STOR : S ILICON , PNP 




04713 


SPS246 


Q1030 


151-0223-00 






TRANSISTOR : SILICON , NPN 




04713 


SPS8026 


Q1032 


151-0223-00 






TRANSISTOR : SILICON , NPN 




04713 


SPS8026 


Q1038 


151-0221-00 






TRANSISTOR: SILICON, PNP 




04713 


SPS246 


Q1040 


151-0190-00 






TRANSISTOR: SILICON, NPN 




07263 


S032677 


Q1046 


151-0220-00 






TRANSISTOR: SILICON, PNP 




07263 


S036228 


Q1050 


151-0220-00 






TRANSISTOR: SILICON, PNP 




07263 


S036228 


Q1060 


151-0190-00 






TRANSISTOR : SILICON , NPN 




07263 


S032677 


Q1066 


151-0220-00 






TRANSISTOR: SILICON, PNP 




07263 


S036228 


Q1070 


151-0220-00 






TRANSISTOR: SILICON, PNP 




07263 


S036228 


Q1 108 


151-0223-00 






TRANSISTOR: SILICON, NPN 




04713 


SPS8026 


Q1118 


151-0223-00 






TRANSISTOR : SILICON , NPN 




04713 


SPS8026 


Q 1 X 2 2 


151-0325-00 






TRANSISTOR: SILICON, PNP, SEL FROM 


2N4258 


80009 


151-0325-00 


Q1126 


151-0160-00 


B010100 


B142529 


TRANSISTOR : SILICON , NPN 




80009 


151-0160-00 










(7844 ONLY) 








Q1126 


151-0451-00 


B142530 




TRANSISTOR: SILICON, NPN 




02735 


65128 










(7844 ONLY) 








Q 1 1 2 6 


151-0160-00 


B010100 


B141209 


TRANSISTOR: SILICON, NPN 




80009 


151-0160-00 










( R7844 ONLY) 








Q1126 


151-0451-00 


B141210 




TRANSISTOR: SILICON, NPN 




02735 


65128 










(R7844 ONLY) 








Q1 1 32 


151-0220-00 






TRANSISTOR: SILICON, PNP 




07263 


S036228 


Q1136 


151-0134-00 






TRANSISTOR: SILICON, PNP 




80009 


151-0134-00 


Q1140 


151-0274-00 






TRANSISTOR: SILICON, NPN 




80009 


151-0274-00 


Q1150 


151-0270-00 






TRANSISTOR: SILICON, PNP 




04713 


OBD 


Q1234 


151-0368-01 






TRANSISTOR: SILICON, NPN 




80009 


151-0368-01 


Q1238 


151-0508-00 


XB 1 4 1 7 7 5 




TRANSISTOR: UJT, SI, 2N6027,TO-98 




03508 


2N6027 










(7844 ONLY) 








Q1238 


151-0508-00 


XB140840 




TRANSISTOR : UJT, SI , 2N6027 ,TO-98 




03508 


2N6027 










(R7844 ONLY) 








Q1241 


151-0368-01 






TRANS I STOR : S ILICON , NPN 




80009 


151-0368-01 


Q1246 


151-0260-00 






TRANSISTOR. SILICON, NPN 




80009 


151-0260-00 


Q1248 


151-0519-00 


B010100 


B110974 


SCR: SILICON 




04713 


SCR5016K 










(7844 ONLY) 








Q1248 


151-0529-00 


B110975 




SCR: 200V , 0 . 5A 




04713 


MCR206 










(7844 ONLY) 








Q1248 


151-0519-00 


B010100 


B1 10474 


SCR: SILICON 




04713 


SCR5016K 










( R7844 ONLY) 









8-46 



REV OCT 1981 





Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix 
Ckt No. Part No. 



Serial/Model No. 

Eft Dscont 



Name & Description 



Mfr 

Code Mfr Part Number 



Q1248 


151-0529-00 


B100475 




SCR: 200V ,0. 5A 




04713 


MCR206 










(R7844 ONLY) 








Q1252 


151-0302-00 






TRANSISTOR: SILICON, NPN 




07263 


S038487 


Q1254 


151-0302-00 


B010100 


B141744 


TRANS; I STOR : S ILICON , NPN 




07263 


S038487 










(7844 ONLY) 








Q1254 


151-0273-00 


B141745 




TRANSISTOR : S ILICON , NPN 




80009 


151-0273-00 










(7844 ONLY) 








Q1254 


151-0302-00 


B010100 


B141744 


TRANSISTOR : SILICON , NPN 




07263 


S038487 










(R7844 ONLY) 








Q1254 


151-0273-00 


B141745 




TRANSISTOR: SILICON, NPN 




80009 


151-0273-00 










(R7844 ONLY) 








Q1373 


151-0216-00 






TRANSISTOR: SILICON, PNP 




04713 


SPS8803 


Q1409A.B 


151-0232-00 






TRANSISTOR: SILICON , NPN , DUAL 




80009 


151-0232-00 


Q1415 


151-0292-00 






TRANSISTOR: SILICON, NPN 




80009 


151-0292-00 


Q1418 


151-0228-00 






TRANSISTOR: SILICON, PNP, SEL FROM 


2N4888 


80009 


151-0228-00 


Q1425 


151-0136-00 


B010100 


B131429 


TRANSISTOR: SILICON, NPN 




02735 


35495 










(7844 ONLY) 








Q1425 


151-0136-03 


B131430 




TRANSISTOR : SILICON , NPN , SEL 




80009 


151-0136-03 










(7844 ONLY) 








Q1425 


151-0136-00 


B010100 


B130634 


TRANSISTOR: SILICON, NPN 




02735 


35495 










( R7844 ONLY) 








Q1425 


151-0136-03 


B130635 




TRANSISTOR : SILICON , NPN , SEL 




80009 


151-0136-03 










( R7844 ONLY) 








Q1428 


151-0349-00 






TRANS I STOR : SILICON , NPN , SEL FROM 


MJE2801 


04713 


SJE924 


Q1436A.B 


151-0232-00 






TRANSISTOR : SILICON , NPN , DUAL 




80009 


151-0232-00 


Q1445A.B 


151-0232-00 






TRANS I STOR: SILICON , NPN , DUAL 




80009 


151-0232-00 


Q1451 


151-0190-00 






TRANS I STOR : SILICON , NPN 




07263 


S032677 


Q1455 


151-0260-02 






TRANSISTOR : SILICON , NPN 




04713 


ST1149 


Q1458 


151-0349-00 






TRANS I STOR .'SILICON, NPN, SEL FROM MJE2801 


04713 


SJE924 


Q1466A.B 


151-0232-00 






TRANSISTOR : S ILICON , NPN , DUAL 




80009 


151-0232-00 


Q1485 


151-0216-00 






TRANSISTOR : SILICON , PNP 




04713 


SPS8803 


Q1489A.B 


151-0232-00 






TRANSISTOR : SILICON , NPN , DUAL 




80009 


151-0232-00 


Q1496 


151-0260-02 






TRANSISTOR: SILICON, NPN 




04713 


ST1149 


Q1498 


151-0349-00 






TRANSISTOR : SILICON , NPN, SEL FROM 


MJE2801 


04713 


SJE924 


Q1508A.B 


151-0232-00 






TRANSISTOR : SILICON , NPN , DUAL 




80009 


151-0232-00 


Q1522 


151-0228-00 






TRANSISTOR: SILICON , PNP , SEL FROM 


2N4888 


80009 


151-0228-00 


Q1526 


151-0302-00 






TRANSISTOR : SILICON , NPN 




07263 


S038487 


Q1534 


151-0136-00 


B010100 


B131429 


TRANSISTOR: SILICON, NPN 




02735 


35495 










(7844 ONLY) 








Q1534 


151-0136-03 


B131430 




TRANSISTOR: SILICON, NPN, SEL 




80009 


151-0136-03 










(7844 ONLY) 








Q1534 


151-0136-00 


B010100 


B130634 


TRANSISTOR: SILICON, NPN 




02735 


35495 










( R7844 ONLY) 








Q1534 


151-0136-03 


B130635 




TRANSISTOR : S ILICON , NPN , SEL 




80009 


151-0136-03 










( R7844 ONLY) 








Q1538 


151-0349-00 






TRANSISTOR : SILICON , NPN , SEL FROM 


MJE2801 


04713 


SJE924 


Q1546 


151-0192-00 






TRANSISTOR : SILICON , NPN, SEL FROM 


MPS6521 


04713 


SPS8801 


Q1550 


151-0324-01 






TRANSISTOR: SILICON, PNP 




80009 


151-0324-01 


Q1560A.B 


151-0232-00 






TRANSISTOR .'SILICON, NPN , DUAL 




80009 


151-0232-00 


Q1576A.B 


151-0232-00 






TRANSISTOR : SILICON , NPN , DUAL 




80009 


151-0232-00 


Q1582 


151-0192-00 






TRANSISTOR: SILICON, NPN, SEL FROM 


MPS6521 


04713 


SPS8801 


Q1585 


151-0260-00 






TRANSISTOR: SILICON, NPN 




80009 


151-0260-00 


Q1588 


151-0349-00 






TRANSISTOR : SILICON , NPN , SEL FROM 


MJE2801 


04713 


SJE924 


Q1627 


151-0228-00 






TRANSISTOR : SILICON , PNP , SEL FROM 


2N4888 


80009 


151-0228-00 


Q1631 


151-0279-00 






TRANSISTOR: SILICON, NPN 




80009 


151-0279-00 


Q1694 


151-0302-00 






TRANSISTOR : SILICON , NPN 




07263 


S038487 



REV OCT 1981 



8-47 





Replaceable Electrical Parts— 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eft 


Dscont 


Q1700 

Q1710 

Q1720 

Q1785 


151-0342-00 

151-0302-00 

151-0302-00 

151-0390-00 


XB040000 




Q1785 


151-0390-00 


XB030000 




Q1786 


151-0126-00 


XB040000 




Q1786 


151-0126-00 


XB030000 




Q 1 8 1 2 


151-0220-00 


B010100 


B099999X 


Q1812 


151-0220-00 


B010100 


B109999X 


Q1814 


151-0220-00 


B010100 


B099999X 


Q1814 


151-0220-00 


B010100 


B109999X 


Q1826 


151-0220-00 


B010100 


B099999X 


Q1826 


151-0220-00 


B010100 


B109999X 


QI828 


151-0220-00 


B010100 


B099999X 


Q1828 


151-0220-00 


B010100 


B109999X 


Q1844 


151-0369-00 


B010100 


B099999X 


Q1844 


151-0369-00 


B010100 


B109999X 


Q1848 


151-0223-00 


B010100 


B099999X 


Q1848 


151-0223-00 


B010100 


B109999X 


Q1854 


151-0223-00 


B010100 


B099999X 


Q1854 


151-0223-00 


B010100 


B109999X 


Q1858 


151-0369-00 


B010100 


B099999X 


Q1858 


151-0369-00 


B010100 


B109999X 


Q1860 


151-0221-00 


B010100 


B099999X 


QI860 


151-0221-00 


B010100 


B109999X 


Q1864 


151-0424-00 


B010100 


B099999X 


Q1864 


151-0424-00 


B010100 


B109999X 


Q1870 


151-0424-00 


B010100 


B099999X 


Q1870 


151-0424-00 


B010100 


B109999X 


Q1874 


151-0221-00 


B010100 


B099999X 



Name & Description 



TRANSISTO R: SILICON, PNP 
TRANSISTOR: SILICON, NPN 
TRANSISTOR: SILICON, NPN 
TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(R7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANSISTOR : SILICON , NPN 
( R7844 ONLY) 
TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 
TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 
TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANS ISTOR : SILICON , PNP 
(R7844 ONLY) 

TRANS ISTOR: SILICON , PNP 
(7844 ONLY) 

TRANS ISTC'R : SILICON , NPN 
( R7844 ONLY) 
TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANS ISTOR : SILICON , NPN 
( R7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 
TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 
TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANS ISTOR: SILICON, NPN 
(R7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANSISTOR: SILICON , NPN 
(R7844 ONLY) 
TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 



Mfr 

Code Mfr Part Number 



07263 

07263 

07263 

04713 


S035928 

S038487 

S038487 

SPS3414 


04713 


SPS3414 


04713 


ST1046 


04713 


ST1046 


07263 


S036228 


07263 


S036228 


07263 


S036228 


07263 


S036228 


07263 


S036228 


07263 


S036228 


07263 


S036228 


07263 


S036228 


01295 


SKA6664 


01295 


SKA6664 


04713 


SPS8026 


04713 


SPS8026 


04713 


SPS8026 


04713 


SPS8026 


01295 


SKA6664 


01295 


SKA6664 


04713 


SPS246 


04713 


SPS246 


04713 


SPS8246 


04713 


SPS8246 


04713 


SPS8246 


04713 


SPS8246 


04713 


SPS246 



8-48 



REV OCT 1981 





Replaceable Electrical Parts— 7844/R7844 Service 



Tektronix Serial/Model No. Mir 



Ckt No. 


Part No. 


Eff 


Dscont 


Name & Description 




Code 


Mfr Part Number 


Q1874 


151-0221-00 


B010100 


B109999X 


TRANSISTOR : SILICON , PNP 






04713 


SPS246 










(7844 ONLY) 










Q1890 


151-0270-00 


B010100 


B099999X 


TRANSISTOR : SILICON , PNP 






04713 


OBD 










(R7844 ONLY) 










Q1890 


151-0270-00 


B010100 


B109999X 


TRANSISTOR: SILICON , PNP 






04713 


OBD 










(7844 ONLY) 










Q1896 


151-0274-00 


B010100 


B099999X 


TRANSISTOR: SILICON, NPN 






80009 


151-0274-00 










(R7844 ONLY) 










Q1896 


151-0274-00 


B010100 


B109999X 


TRANSISTOR : S ILICON , NPN 






80009 


151-0274-00 










(7844 ONLY) 










Q1902 


151-0220-00 






TRANSISTOR : SILICON , PNP 






07263 


S036228 


Q1904 


151-0367-00 






TRANSISTOR : SILICON , NPN , SEL 


FROM 


3571TP 


01295 


SKA6516 


Q1920 


151-0270-00 






TRANSISTOR: SILICON, PNP 






04713 


OBD 


QX926 


151-0274-00 






TRANS I STOR : SILICON , NPN 






80009 


151-0274-00 


Q1934 


151-0220-00 






TRANS I STOR : S ILICON , PNP 






07263 


S036228 


Q2008 


151-0223-00 






TRANS I STOR : SILICON , NPN 






04713 


SPS8026 


Q2018 


151-02"’3-00 






TRANSISTOR: SILICON, NPN 






04713 


SPS8026 


Q2022 


151-0325-00 






TRANSISTOR : SILICON , PNP , SEL 


FROM 


2N4258 


80009 


151-0325-00 


Q2026 


151-0160-00 


B010100 


B142529 


TRANS I STOR: SILICON , NPN 






80009 


151-0160-00 










(7844 ONLY) 










Q2026 


151-0451-00 


B142530 




TRANSISTOR : SILICON, NPN 






02735 


65128 










(7844 ONLY) 










Q2026 


151-0160-00 


B010100 


B141209 


TRANSI STOR : SILICON , NPN 






80009 


151-0160-00 










( R7844 ONLY) 










Q2026 


151-0451-00 


B141210 




TRANSISTOR: SILICON, NPN 






02735 


65128 










(R7844 ONLY) 










Q2032 


151-0220-00 






TRANSISTOR: S ILICON , PNP 






07263 


S036228 


Q2036 


151-0134-00 






TRANSISTOR: SILICON, PNP 






80009 


151-0134-00 


Q2040 


151-0274-00 






TRANSISTOR : SILICON , NPN 






80009 


151-0274-00 


Q2050 


151-0270-00 






TRANS I STOR : S ILICON , PNP 






04713 


OBD 


Q2108 


151-0223-00 






TRANSISTOR : SILICON , NPN 






04713 


SPS8026 


Q2112 


151-0221-00 






TRANSISTOR: SILICON, PNP 






04713 


SPS246 


Q2138 


151-0188-00 






TRANSISTOR : SILICON , PNP 






04713 


SPS6868K 


Q2153 


151-0192-00 






TRANS ISTOR : SILICON , NPN , SEL 


FROM 


MPS652I 


04713 


SPS8801 


Q2159 


151-0190-00 






TRANSISTOR: SILICON, NPN 






07263 


S032677 


Q2215A.B 


151-0232-00 






TRANS ISTOR : SILICON , NPN , DUAL 




80009 


151-0232-00 


Q2223 


151-0190-00 






TRANSISTOR : SILICON ,NPN 






07263 


S032677 


Q2225 


151-0188-00 






TRANSISTOR: SILICON, PNP 






04713 


SPS6868K 


Q2229 


151-0190-00 






TRANSISTOR : SILICON , NPN 






07263 


S032677 


Q2240 


151-0190-00 






TRANSISTOR: SILICON, NPN 






07263 


S032677 


Q2286 


151-0188-00 






TRANSISTOR : SILICON , PNP 






04713 


SPS6868K 


Q2287 


151-0188-00 






TRANSISTOR: SILICON, PNP 






04713 


SPS6868K 


Q2296 


151-0188-00 






TRANSISTOR: SILICON, PNP 






04713 


SPS6868K 


Q2299 


151-0188-00 






TRANSISTOR: SILICON ,PNP 






04713 


SPS6868K 


Q2450 


151-0350-00 






TRANSISTOR: SILICON, PNP 






04713 


SPS6700 


Q2456 


151-0220-00 






TRANSISTOR: SILICON, PNP 






07263 


S036228 


Q2458 


151-0220-00 






TRANSISTOR: SILICON, PNP 






07263 


S036228 


Q2460 


151-0347-00 






TRANSISTOR: SILICON, NPN 






56289 


2N5551 


Q2464 


151-0341-00 






TRANSISTOR: SILICON, NPN 






07263 


S040065 


Q2480 


151-0228-00 






TRANSISTOR : SILICON , PNP , SEL 


FROM 


2N4888 


80009 


151-0228-00 


Q2486 


151-0220-00 






TRANSISTOR: SILICON, PNP 






07263 


S036228 


Q2488 


151-0220-00 






TRANSISTOR : SILICON , PNP 






07263 


S036228 


Q2490 


151-0292-00 






TRANSISTOR : SILICON , NPN 






80009 


151-0292-00 


Q2494 


151-0341-00 






TRANSISTOR: SILICON , NPN 






07263 


S040065 


Q2495 


151-0341-00 






TRANSISTOR : SILICON , NPN 






07263 


S040065 


Q2512 


151-0301-00 






TRANSISTOR : SILICON, PNP 






27014 


2N2907A 


Q2694 


151-0302-00 






TRANSISTOR : SILICON , NPN 






07263 


S038487 



REV OCT 1981 



8-49 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eft 


Dscont 


Q2700 

Q2710 

Q2720 

Q2785 


151-0342-00 

151-0302-00 

151-0302-00 

151-0390-00 


XB040000 




Q2785 


151-0390-00 


XB030000 




Q2786 


151-0126-00 


XB040000 




Q2786 


151-0126-00 


XB030000 




Q2808 


151-0224-00 


B010100 


B099999X 


Q2808 


151-0224-00 


B010100 


B109999X 


Q2812 


151-0220-00 


B010100 


B099999X 


Q2812 


151-0220-00 


B010100 


B109999X 


Q2814 


151-0220-00 


B010100 


B099999X 


Q2814 


151-0220-00 


B010100 


B109999X 


Q2826 


151-0220-00 


B010100 


B099999X 


Q2826 


151-0220-00 


B010100 


B109999X 


Q2828 


151-0220-00 


BO 10100 


B099999X 


Q2828 


151-0220-00 


B010100 


B109999X 


Q2844 


151-0369-00 


B010100 


B099999X 


Q2844 


151-0369-00 


B010100 


B109999X 


Q2848 


151-0223-00 


B010100 


B099999X 


Q2848 


151-0223-00 


B010100 


B109999X 


Q2854 


151-0223-00 


B010100 


B099999X 


Q2854 


151-0223-00 


B010100 


B109999X 


Q2858 


151-0369-00 


B010100 


B099999X 


Q2858 


151-0369-00 


B010100 


B109999X 


Q2860 


151-0221-00 


B010100 


B099999X 


Q2860 


151-0221-00 


B010100 


B109999X 


Q2864 


151-0424-00 


B010100 


B099999X 


Q2864 


151-0424-00 


B010100 


B109999X 


Q2870 


151-0424-00 


B010100 


B099999X 



Name & Description 



TRANSISTOR: SILICON, PNP 
TRANSISTOR : SILICON , NPN 
TRANSISTOR : SILICON , NPN 
TRANSISTOR: SILICON , NPN 
(7844 ONLY) 

TRANSISTOR: SILICON, NPN 
( R7844 ONLY) 

TRANSISTOR: SILICON, NPN 
<7844 ONLY) 

TRANSISTOR: SILICON, NPN 
( R7844 ONLY) 

TRANSISTOR : SILICON , NPN 
( R7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANS ISTOR : S ILICON , PNP 
(R7844 ONLY) 
TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
( R7844 ONLY) 
TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR : SILICON , PNP 
( R7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR : SILICON , PNP 
(R7844 ONLY) 

TRANS ISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 
TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR : SILICON , NPN 
(R7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANSISTOR : SILICON , NPN 
( R7844 ONLY) 

TRANSISTOR : SILICON, NPN 
(7844 ONLY) 

TRANSISTOR : SILICON , PNP 
(R7844 ONLY) 
TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR : SILICON , PNP 
(R7844 ONLY) 

TRANS ISTOR: SILICON, PNP 
(7844 ONLY) 

TRANS ISTOR: SILICON, NPN 
( R7844 ONLY) 
TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANS ISTOR: SILICON, NPN 
( R7844 ONLY) 



Mfr 

Code Mfr Part Number 



07263 

07263 

07263 

04713 


S035928 

S038487 

S038487 

SPS3414 


04713 


SPS3414 


04713 


ST1046 


04713 


ST1046 


07263 


SA24850 


07263 


SA24850 


07263 


S036228 


07263 


S036228 


07263 


S036228 


07263 


S036228 


07263 


S036228 


07263 


S036228 


07263 


S036228 


07263 


S036228 


01295 


SKA6664 


01295 


SKA6664 


04713 


SPS8026 


04713 


SPS8026 


04713 


SPS8026 


04713 


SPS8026 


01295 


SKA6664 


01295 


SKA6664 


04713 


SPS246 


04713 


SPS246 


04713 


SPS8246 


04713 


SPS8246 


04713 


SPS8246 



8-50 



REV OCT 1981 



Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eff 


Dscont 


Q2870 


151-0424-00 


B010100 


B109999X 


Q2874 


151-0221-00 


B010100 


B099999X 


Q2874 


151-0221-00 


B010100 


B109999X 


Q2890 


151-0270-00 


BO 10100 


B099999X 


Q2890 


151-0270-00 


B010100 


B109999X 


Q2896 


151-0274-00 


B010100 


B099999X 


Q2896 


151-0274-00 


B010100 


B109999X 


Q2902 


151-0220-00 


8010100 


B099999X 


Q2902 


151-0220-00 


B010100 


B109999X 


Q2904 


151-0367-00 


B010100 


B099999X 


Q2904 


151-0367-00 


B010100 


B109999X 


Q2920 


151-0270-00 


B010100 


B099999X 


Q2920 


151-0270-00 


B010100 


B109999X 


Q2926 


151-0274-00 


B010100 


B099999X 


Q2926 


151-0274-00 


B010100 


B109999X 


Q2934 


151-0220-00 


B010100 


B099999X 


Q2934 


151-0220-00 


B010100 


B109999X 


Q3158 


151-0341-00 






Q3162 


151-0341-00 






Q3170 


151-0341-00 






Q3174 


151-0341-00 






Q3180 


151-0341-00 






Q3182 


151-0199-00 






C) 3602 


153-0625-00 






Q3604 


153-0625-00 






Q3702 


153-0625-00 






Q3704 


153-0625-00 






Q3748 


151-0188-00 






Q3790 


151-0435-00 







Name & Description 



TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANS I STOR : SILICON , PNP 
( R7844 ONLY) 

TRANSISTOR : SILICON , PNP 
(7844 ONLY) 

TRANSISTOR : SILICON , PNP 
(R7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR: SILICON, NPN 
( R7844 ONLY) 

TRANSISTOR : SILICON , NPN 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
( R7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR : SILICON , NPN, SEL FROM 3571TP 
( R7844 ONLY) 

TRANSISTOR : SILICON , NPN , SEL FROM 3571TP 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
( R7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR : SILICON , NPN 
(R7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANS ISTOR: SILICON , PNP 
( R7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(Q3158 , 7844/R7844 ONLY) 

TRANS ISTOR: SILICON, NPN 
(Q3162 , 7844/R7844 ONLY) 

TRANS ISTOR: SILICON, NPN 
(Q3170, 7844/R7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(Q3174, 7844/R7844 ONLY) 

TRANS ISTOR: SILICON, NPN 
(Q3180 , 7844/R7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(Q3182 , 7844/R7844 ONLY) 

TRANS ISTOR: SILICON , PNP , SELECTED 
(Q3602 , 7844/R7844 ONLY) 

TRANSISTOR : SILICON , PNP , SELECTED 
(Q3604 , 7844/R7844 ONLY) 

TRANSISTOR: SILICON, PNP, SELECTED 
(Q3702 , 7844/R7844 ONLY) 

TRANSISTOR: SILICON , PNP , SELECTED 
(Q3704 , 7844/R7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(Q3748, 7844/R7844 ONLY) 

TRANSISTOR : SILICON , PNP 
(Q3790 , 7844/R7844 ONLY) 



Mfr 

Code Mfr Part Number 



04713 


SPS8246 


04713 


SPS246 


04713 


SPS246 


04713 


OBD 


04713 


OBD 


80009 


151-0274-00 


80009 


151-0274-00 


07263 


S036228 


07263 


S036228 


01295 


SKA6516 


01295 


SKA6516 


04713 


OBD 


04713 


OBD 


80009 


151-0274-00 


80009 


151-0274-00 


07263 


S036228 


07263 


S036228 


07263 


S040065 


07263 


S040065 


07263 


S040065 


07263 


S040065 


07263 


S040065 


04713 


SPS6866K 


80009 


153-0625-00 


80009 


153-0625-00 


80009 


1 53-062 j-00 


80009 


153-0625-00 


04713 


SPS6868K 


04713 


SPS8335 



REV OCT 1981 



8-51 



Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. Mfr 



Ckt No. 


Part No. 


Eft Dscont 


Name & Description 




Code 


Mfr Part Number 


Q3795 


151-0190-00 




TRANSISTOR: SILICON, NPN 
(Q3795 , 7844/R7844 ONLY) 
TRANSISTOR : SILICON , PNP 
(Q3798 , 7844/R7844 ONLY) 
TRANSISTOR: SILICON, NPN 
(Q4112, OPTION 22 ONLY) 






07263 


S032677 


Q3798 


151-0188-00 








04713 


SPS6868K 


Q4112 


151-0223-00 








04713 


SPS8026 
















Q4122 


151-0224-00 




TRANSISTOR: SILICON, NPN 
(Q4122, OPTION 22 ONLY) 
TRANSISTOR: SILICON, NPN 
(Q4124 , OPTION 22 ONLY) 
TRANSISTOR: SILICON, NPN 
(Q4131 , OPTION 22 ONLY) 






07263 


SA24850 


Q4124 


151-0224-00 








07263 


SA24850 


Q4131 


151-0224-00 








07263 


SA24850 
















Q4145 


151-0224-00 




TRANSISTOR: SILICON, NPN 
(Q4145, OPTION 22 ONLY) 
TRANSISTOR: SILICON , NPN 
(Q4150 , OPTION 22 ONLY) 
TRANSISTOR: SILICON, NPN 
(Q4154, OPTION 22 ONLY) 






07263 


SA24850 


Q4150 


151-0224-00 








07263 


SA24850 


Q4154 


151-0224-00 








07263 


SA24850 
















Q4158 


151-0224-00 




TRANSISTOR: SILICON, NPN 
(Q4158, OPTION 22 ONLY) 
TRANSISTOR: SILICON, NPN 
(Q4160 , OPTION 22 ONLY) 
TRANSISTOR: SILICON, PNP 
(Q4163 , OPTION 22 ONLY) 






07263 


SA24850 


Q4160 


151-0224-00 








07263 


SA24850 


Q4163 


151-0301-00 








27014 


2N2907A 
















Q4168 


151-0224-00 




TRANSISTOR: SILICON, NPN 
(Q4168 , OPTION 22 ONLY) 
TRANSISTOR : SILICON , NPN 
(Q4170 , OPTION 22 ONLY) 
TRANSISTOR: SILICON, PNP 
(Q4173 , OPTION 22 ONLY) 






07263 


SA24850 


Q4170 


151-0224-00 








07263 


SA24850 


Q4173 


151-0301-00 








27014 


2N2907A 
















Q4180 


151-0219-00 


XB1 10000 


TRANSISTOR : SILICON , PNP 
(Q4180, OPTION 22 ONLY) 
TRANS I STOR : SILICON , NPN 
(Q4183, OPTION 22 ONLY) 
TRANSISTOR : SILICON , PNP , SEL 
(Q4812 , R7844 ONLY) 






07263 


S022650 


Q4183 


151-0224-00 








07263 


SA24850 


Q4812 


151-0325-00 


XB100000 


FROM 


2N4258 


80009 


151-0325-00 
















Q4812 


151-0325-00 


XB1 10000 


TRANSISTOR : SILICON , PNP , SEL 
(7844 ONLY) 

TRANSISTOR : SILICON , PNP , SEL 
( R7844 ONLY) 

TRANSISTOR : SILICON , PNP, SEL 
(7844 ONLY) 


FROM 


2N4258 


80009 


151-0325-00 


Q4814 


151-0325-00 


XB100000 


FROM 


2N4258 


80009 


151-0325-00 


Q4814 


151-0325-00 


XB1 10000 


FROM 


2N4258 


80009 


151-0325-00 
















Q4828 


151-0220-00 


XB100000 


TRANSISTOR: SILICON, PNP 
( R7844 ONLY) 
TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(7844 ONLY) 






07263 


S036228 


Q4828 


151-0220-00 


XB 110000 






07263 


S036228 


Q4835 


151-0220-00 


XB100000 






07263 


S036228 
















Q4835 


151-0220-00 


XB1 10000 


TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 
TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
( R7844 ONLY) 






07263 


S036228 


Q4844 


151-0220-00 


XB100000 






07263 


S036228 


Q4844 


151-0220-00 


XB1 10000 






07263 


S036228 
















Q4846 


151-0195-00 


XB100000 


TRANSISTOR: SILICON, NPN 






80009 


151-0195-00 



(7844 ONLY) 



8-52 



REV OCT 1981 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/ Model No. 



Ckt No. 


Part No. 


Eft 


Dscont 


Q4846 


151-0195-00 


XB 11 0000 




Q4848 


151-0434-00 


XB100000 


B100453 


Q4848 


151-0188-00 


B100454 




Q4848 


151-0434-00 


XB 110000 


B110894 


Q4848 


151-0188-00 


B110895 




Q4854 


151-0220-00 


XB100000 




Q4854 


151-0220-00 


XB 110000 




Q4856 


151-0195-00 


XB 100000 




Q4856 


151-01°5-00 


XB1 10000 




Q4858 


151-0441-00 


XB100000 


B100453 


Q4858 


151-0190-00 


B100454 




Q4858 


151-0441-00 


XB1 10000 


B110894 


Q4858 


151-0190-00 


B110895 




Q4868 


151-0220-00 


XB100000 




Q4868 


151-0220-00 


XB110000 




Q4870 


151-0220-00 


XB100000 




Q4870 


151-0220-00 


XB110000 




Q4872 


151-0274-00 


XB100000 




Q4872 


151-0274-00 


XB1 10000 




Q4876 


151-0270-00 


XB100000 




Q4876 


151-0270-00 


XB110000 




Q4888 


151-0190-00 


XB100000 




Q4888 


151-0190-00 


XB110000 




Q4890 


151-0190-00 


XB100000 




Q4890 


151-0190-00 


XB 110000 




Q4892 


151-0274-00 


XB100000 




Q4892 


151-0274-00 


XB1 10000 




Q4896 


151-0270-00 


XB100000 




Q4896 


151-0270-00 


XB110000 





Name & Description 



TRANSISTOR : SILICON , NPN 
( R7844 ONLY) 
TRANSISTOR: SILICON, PNP 
( R7844 ONLY) 
TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 

TRANSISTOR : SILICON , PNP 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR : SILICON , PNP 
(R7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR : SILICON , NPN 
(R7844 ONLY) 
TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(R7844 ONLY) 
TRANSISTOR: SILICON, NPN 
(R7844 ONLY) 

TRANSISTOR : SILICON , NPN 
(7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 

TRANSISTOR : SILICON , PNP 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 
TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 
TRANSISTOR: SILICON, NPN 
( R7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 
TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR : SILICON , NPN 
(R7844 ONLY) 
TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANSISTOR: SILICON, NPN 
( R7844 ONLY) 

TRANSISTOR : SILICON , NPN 
(7844 ONLY) 

TRANSISTOR : SILICON , NPN 
(R7844 ONLY) 
TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
( R7844 ONLY) 

TRANSISTOR : SILICON , PNP 
(7844 ONLY) 



Mfr 

Code 


Mfr Part Number 


80009 


151-0195-00 


04713 


SS7144 


04713 


SPS6868K 


04713 


SS7144 


04713 


SPS6868K 


07263 


S036228 


07263 


S036228 


80009 


151-0195-00 


80009 


151-0195-00 


04713 


SRF501 


07263 


S032677 


04713 


SRF501 


07263 


S032677 


07263 


S036228 


07263 


S036228 


07263 


S036228 


07263 


S036228 


80009 


151-0274-00 


80009 


151-0274-00 


04713 


OBD 


04713 


OBD 


07263 


S032677 


07263 


S032677 


07263 


S032677 


07263 


S032677 


80009 


151-027'. -00 


80009 


151-0274-00 


04713 


OBD 


04713 


OBD 



REV OCT 1981 



8-53 



Replaceable Electrical Parts— 7844/R7844 Service 



Tektronix Serial/Model No, 



Ckt No, 


Part No, 


Eff 


Dscont 


Q5808 


151-0190-00 


XB100000 




Q5808 


151-0190-00 


XB110000 




Q5812 


151-0325-00 


XB100000 




Q5812 


151-0325-00 


XB 11 0000 




Q5814 


151-0325-00 


XB100000 




Q5814 


151-0325-00 


XB1 10000 




Q5828 


151-0220-00 


XB100000 




Q5828 


151-0220-00 


XB 110000 




Q5835 


151-0220-00 


XB100000 




Q5835 


151-0220-00 


XB1 10000 




Q5844 


151-0220-00 


XB100000 




Q5844 


151-0220-00 


XB1 10000 




Q5846 


151-0195-00 


XB100000 




Q5846 


151-0195-00 


XB1 10000 




Q5848 


151-0434-00 


XB100000 


B100453 


Q5848 


151-0188-00 


B100454 




Q5848 


151-0434-00 


XB 110000 


B110894 


Q5848 


151-0188-00 


B110895 




Q5854 


151-0220-00 


XB100000 




Q5854 


151-0220-00 


XB110000 




Q5856 


151-0195-00 


XB100000 




Q5856 


151-0195-00 


XB110000 




Q5858 


151-0441-00 


XB100000 


B100453 


Q5858 


151-0190-00 


B100454 




Q5858 


151-0441-00 


XB110000 


B1 10894 


Q5858 


151-0190-00 


B110895 




Q5868 


151-0220-00 


XB100000 




Q5868 


151-0220-00 


XB1 10000 





Name & Description 



TRANS I STO R : S I LI CON , NPN 
(R7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP, SEL FROM 
(R7844 ONLY) 

TRANSISTOR : SILICON , PNP, SEL FROM 
(7844 ONLY) 

TRANSISTOR : SILICON , PNP, SEL FROM 
(R7844 ONLY) 

TRANSISTOR: SILICON, PNP, SEL FROM 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
( R7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANS I STOR : S ILICON , NPN 
(R7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANS I STOR : S ILICON , PNP 
(R7844 ONLY) 

TRANSISTOR: SILICON, PNP 
( R7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR : SILICON , PNP 
(7844 ONLY) 

TRANSISTOR : SILICON , PNP 
( R7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(R7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANSISTOR: SILICON, NPN 
( R7844 ONLY) 

TRANSISTOR: SILICON, NPN 
( R7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(R7844 ONLY) 

TRANSISTOR: SILICON, NPN 
(7844 ONLY) 

TRANSISTOR: SILICON, PNP 
( R7844 ONLY) 

TRANSISTOR: SILICON, PNP 
(7844 ONLY) 



Mfr 

Code Mfr Part Number 





07263 


S032677 




07263 


S032677 


2N4258 


80009 


151-0325-00 


2N4258 


80009 


151-0325-00 


2N4258 


80009 


151-0325-00 


2N4258 


80009 


151-0325-00 




07263 


S036228 




07263 


S036228 




07263 


S036228 




07263 


S036228 




07263 


S036228 




07263 


S036228 




80009 


151-0195-00 




80009 


151-0195-00 




04713 


SS7144 




04713 


SPS6868K 




04713 


SS7144 




04713 


SPS6868K 




07263 


S036228 




07263 


S036228 




80009 


151-0195-00 




80009 


151-0195-00 




04713 


SRF501 




07263 


S032677 




04713 


SRF501 




07263 


S032677 




07263 


S036228 




07263 


S036228 



8-54 



REV OCT 1981 





Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eff Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Number 


Q5870 


151-0220-00 


XB100000 


TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 


07263 


S036228 


Q5870 


151-0220-00 


XB110000 


TRANSISTOR: SILICON, PNP 
(7844 ONLY) 


07263 


S036228 


Q5872 


151-0274-00 


XB100000 


TRANSISTOR : SILICON , NPN 
( R7844 ONLY) 


80009 


151-0274-00 


Q5872 


151-0274-00 


XB1 10000 


TRANSISTOR: SILICON , NPN 
(7844 ONLY) 


80009 


151-0274-00 


Q5876 


151-0270-00 


XB 100000 


TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 


04713 


OBD 


Q5876 


151-0270-00 


XB1 10000 


TRANSISTOR: SILICON , PNP 
(7844 ONLY) 


04713 


OBD 


Q5888 


151-0190-00 


XB100000 


TRANSISTOR : SILICON , NPN 
( R7844 ONLY) 


07263 


S032677 


Q5888 


151-0190-00 


XB1 10000 


TRANS ISTOR: SILICON , NPN 
(7844 ONLY) 


07263 


S032677 


Q5890 


151-0190-00 


XB100000 


TRANS ISTOR: SILICON, NPN 
(R7844 ONLY) 


07263 


S032677 


Q5890 


151-0190-00 


XB1 10000 


TRANSISTOR: SILICON, NPN 
(7844 ONLY) 


07263 


S032677 


Q5892 


151-0274-00 


XB100000 


TRANSISTOR: SILICON, NPN 
(R7844 ONLY) 


80009 


151-0274-00 


Q5892 


151-0274-00 


XB 11 0000 


TRANSISTOR: SILICON, NPN 
(7844 ONLY) 


80009 


151-0274-00 


Q5896 


151-0270-00 


XB100000 


TRANSISTOR: SILICON, PNP 
(R7844 ONLY) 


04713 


OBD 


Q5896 


151-0270-00 


XB110000 


TRANSISTOR: SILICON, PNP 
(7844 ONLY) 


04713 


OBD 


R2 


315-0153-00 




RES . , FXD , CMPSN : 1 5K OHM, 5% , 0 . 25W 


01121 


CB1535 


R4 


315-0153-00 




RES . , FXD , CMPSN : 1 5K OHM,5Z,0.25W 


01121 


CB1535 


R6 


315-0510-00 




RES. , FXD, CMPSN: 51 OHM,5%,0.25W 


01121 


CB5105 


R7 


315-0510-00 




RES . , FXD .CMPSN : 51 0HM,5Z,0.25W 


01121 


CB5105 


R8 


315-0510-00 




RES. , FXD, CMPSN: 51 OHM,5%,0.25W 


01121 


CB5105 


R9 


315-0510-00 




RES . , FXD , CMPSN : 51 OHM, 5% , 0 . 25W 


01121 


CB5105 


RIO 


315-0912-00 




RES . , FXD , CMPSN: 9 . IK OHM, 5% , 0 . 25W 


01121 


CB9125 


Rll 


315-0152-00 




RES., FXD, CMPSN : 1 . 5K OHM,5%,0.25W 


01121 


CB1525 


R12 


315-0105-00 




RES. , FXD, CMPSN : 1M 0HM,5X,0.25W 


01121 


CB1055 


R13 


315-0152-00 




RES. , FXD, CMPSN: 1.5K 0HM,5X,0.25W 


01121 


CB1525 


R14 


315-0104-00 




RES. , FXD, CMPSN : 100K OHM,5Z,0.25W 


01121 


CB1045 


R15 


315-0103-00 




RES. , FXD, CMPSN : 10K OHM,5Z,0.25W 


01121 


CB1035 


R16 


315-0243-00 




RES. , FXD, CMPSN : 24K OHM.5Z.0.25W 


01121 


CB2435 


R17 


315-0472-00 




RES. , FXD, CMPSN: 4. 7K OHM,5%,0.25W 


01121 


CB4725 


R18 


315-0202-00 




RES. , FXD, CMPSN :2K OHM,5%,0.25W 


01121 


CB2025 


R19 


315-0103-00 




RES. , FXD, CMPSN :10K 0HM,5Z,0.25W 


01121 


CB1035 


R20 


315-0912-00 




RES. , FXD, CMPSN: 9. IK OHM.5Z.0.25W 


01121 


CB9125 


R21 


321-0231-00 




RES. ,FXD .FILM: 2 .49K OHM, IX ,0 . 125W 


91637 


MFF1816G24900F 


R22 


321-0231-00 




RES. , FXD, FILM .-2.49K OHM , 1 X , 0 . 1 2 5W 


91637 


MFF1816G24900F 


R23 


315-0132-00 




RES . , FXD .CMPSN : 1 . 3K OHM.5Z.0.25W 


01121 


CB1325 


R24 


315-0132-00 




RES., FXD, CMPSN : 1 . 3K OHM,5Z,0.25W 


01121 


CB1325 


R25 


315-0132-00 




RES., FXD, CMPSN : 1 . 3K OHM,5Z,0.25W 


01121 


CB1325 


R26 


321-0260-00 




RES. , FXD, FILM: 4. 99K OHM, 1% ,0 . 125W 


91637 


MFF1816G49900F 


R27 


321-0260-00 




RES . ,FXD , FILM: 4 . 99K OHM, 1 Z , 0 . 125W 


91637 


MFF1816G49900F 


R28 


321-0260-00 




RES . , FXD .FILM : 4. 99K OHM, 1%,0. 125W 


91637 


MFF1816G49900F 


R29 


321-0260-00 




RES . , FXD , FILM:4 . 99K OHM, 1 X ,0 . 125W 


91637 


MFF1816G49900F 


R30 


315-0102-00 




RES. , FXD, CMPSN: IK OHM,5Z,0.25W 


01121 


CB1025 


R31 


315-0132-00 




RES. , FXD, CMPSN : 1 . 3K OHM,5Z,0.25W 


01121 


CB1325 


R32 


315-0102-00 




RES. , FXD, CMPSN: IK OHM,5Z,0.25W 


01121 


CB1025 



REV OCT 1981 



8-55 



Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eft Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Number 


R34 


315-0102-00 






RES . , FXD, CMPSN : IK OHM,5%,0.25W 


01121 


CB1025 


R36 


315-0102-00 






RES. ,FXD,CMPSN: IK OHM,5%,0.25W 


01121 


CB1025 


R38 


315-0392-00 






RES . , FXD, CMPSN : 3 . 9K 0HM,5%,0.25W 


01121 


CB3925 


R40 


315-0392-00 






RES . , FXD, CMPSN : 3 . 9K OHM,5%,0.25W 


01121 


CB3925 


R42 


315-0362-00 






RES . , FXD , CMPSN : 3 . 6K OHM,5%,0.25W 


01121 


CB3625 


R44 


315-0102-00 






RES. , FXD, CMPSN: IK OHM, 52 , 0 . 25W 


01121 


CB1025 


R45 


315-0102-00 






RES. , FXD, CMPSN: IK OHM,5%,0.25W 


01121 


CB1025 


R46 


315-0362-00 






RES. , FXD, CMPSN: 3. 6K OHM,5%,0.25W 


01121 


CB3625 


R50 


315-0152-00 






RES. , FXD, CMPSN: 1 . 5K OHM,5%,0.25W 


01121 


CB1525 


R51 


315-0103-00 






RES. ,FXD, CMPSN: 10K OHM,52,0.25W 


01121 


CB1035 


R53 


321-0243-00 






RES . , FXD , FILM : 3 . 32K OHM, 1% ,0 . 125W 


91637 


MFF1816G33200F 


R54 


321-0087-00 






RES. , FXD, FILM: 78. 7 OHM, 1% ,0 . 125W 


91637 


MFF1816G78R70F 


R55 


321-0087-00 






RES . , FXD , FILM : 78 . 7 OHM, 12 , 0 . 125W 


91637 


MFF1816G78R70F 


R56 


321-0243-00 






RES . , FXD, FILM: 3 . 32K OHM, 1% , 0 . 125W 


91637 


MFF1816G33200F 


R58 


315-0332-00 






RES. , FXD, CMPSN: 3. 3K OHM,52,0.25W 


01121 


CB3325 


R59 


315-0332-00 






RES. , FXD, CMPSN: 3. 3K OHM,52,0.25W 


01121 


CB3325 


R60 


321-0407-00 






RES. , FXD, FILM: 169K OHM, 12,0. 125W 


91637 


MFF1816G16902F 


R62 


321-0407-00 






RES. , FXD, FILM: 169K OHM, 12 , 0 . 125W 


91637 


MFF1816G16902F 


R64 


315-0152-00 






RES . , FXD , CMPSN : 1 . 5K OHM,5%,0.25W 


01121 


CB1525 


R66 


315-0103-00 






RES., FXD, CMPSN : 10K OHM,5%,0.25W 


01121 


CB1035 


R68 


315-0512-00 






RES., FXD, CMPSN: 5. IK OHM,52,0.25W 


01121 


CB5125 


R69 


315-0103-00 






RES. , FXD, CMPSN: 10K OHM,5%,0.25W 


01121 


CB1035 


R70 


321-0068-00 






RES . , FXD , FILM: 49 . 9 OHM , 12 ,0 . 125W 


91637 


MFF1816G49R90F 


R72 


321-0407-00 






RES. , FXD, FILM: 169K OHM, 12,0. 125W 


91637 


MFF1816G16902F 


R74 


321-0068-00 






RES . ,FXD , FILM: 49 . 9 OHM, 12,0. 125W 


91637 


MFF1816G49R90F 


R76 


321-0407-00 






RES., FXD, FILM: 169K OHM, 12,0. 125W 


91637 


MFF1816G16902F 


R78 


315-0152-00 






RES., FXD, CMPSN : 1 . 5K OHM,52,0.25W 


01121 


CB1525 


R80 


315-0103-00 






RES., FXD, CMPSN : 10K OHM,52,0.25W 


01121 


CB1035 


R82 


321-0243-00 






RES . , FXD , FILM : 3 . 32K OHM, 12 , 0 . 125W 


91637 


MFF1816G33200F 


R84 


321-0087-00 






RES . , FXD, FILM: 78.7 OHM, 12,0. 125W 


91637 


MFF1816G78R70F 


R85 


321-0243-00 






RES . , FXD .FILM: 3 . 32K OHM, 12 , 0 . 1 25W 


91637 


MFF1816G33200F 


R86 


315-0332-00 






RES. , FXD, CMPSN: 3. 3K OHM,52,0.25W 


01121 


CB3325 


R87 


315-0332-00 






RES., FXD, CMPSN: 3. 3K OHM,52,0.25W 


01121 


CB3325 


R89 


321-0087-00 






RES . , FXD .FILM: 78.7 OHM, 12,0. 125W 


91637 


MFF1816G78R70F 


R90 


315-0152-00 






RES., FXD, CMPSN : 1 . 5K OHM,52,0.25W 


01121 


CB1525 


R91 


315-0103-00 






RES . , FXD , CMPSN : 10K OHM, 52,0. 25W 


01121 


CB1035 


R100 


315-0103-00 






RES., FXD, CMPSN : 10K OHM,52,0.25W 


01121 


CB1035 


R102 


315-0103-00 






RES. , FXD, CMPSN : 1 OK OHM,52,0.25W 


01121 


CB1035 


R104 


315-0100-00 






RES. , FXD, CMPSN: 10 OHM,52,0.25W 


01121 


CB1005 


R105 


315-0103-00 






RES. , FXD, CMPSN: 10K OHM,52,0.25W 


01121 


CB1035 


R106 


315-0393-00 






RES. , FXD, CMPSN : 39K 0HM,52,0.25W 


01121 


CB3935 


R107 


315-0102-00 






RES. , FXD, CMPSN: IK OHM,52,0.25W 


01121 


CB1025 


R108 


315-0391-00 






RES. , FXD, CMPSN: 390 OHM,52,0.25W 


01121 


CB3915 


R110 


315-0102-00 






RES. , FXD, CMPSN: IK OHM,52,0.25W 


01121 


CB1025 


Rill 


315-0102-00 






RES., FXD, CMPSN: IK OHM,52,0.25W 


01121 


CB1025 


R112 


315-0103-00 






RES. , FXD, CMPSN : 10K OHM,52,0.25W 


01121 


CB1035 


R1 14 


315-0102-00 






RES. , FXD, CMPSN: IK OHM,52,0.25W 


01121 


CB1025 


R116 


315-0512-00 






RES. , FXD, CMPSN: 5. IK OHM,52,0.25W 


01121 


CB5125 


R129 


315-0391-00 






RES. , FXD, CMPSN: 390 OHM,52,0.25W 


01121 


CB3915 


R130 


321-0193-00 






RES. , FXD, FILM: IK OHM, 12,0. 125W 


91637 


MFF1816G10000F 


R 1 3 1 


315-0391-00 






RES. , FXD, CMPSN: 390 OHM,52,0.25W 


01121 


CB3915 


R132 


321-0193-00 






RES. , FXD, FILM: IK OHM, 12,0. 125W 


91637 


MFF1816G10000F 


R134 


321-0239-00 






RES. , FXD , FILM: 3 .OIK OHM , 12 , 0 . 125W 


91637 


MFF1816G30100F 


R1 36 


321-0407-00 


B010100 


B119999X 


RES., FXD, FILM :169K OHM, 12 ,0 . 125W 


91637 


MFF1816G16902F 


R138 


321-0407-00 


B010100 


B119999X 


RES., FXD, FILM: 169K OHM, 12 , 0 . 125W 


91637 


MFF1816G16902F 


R140 


321-0407-00 


B010100 


B119999X 


RES. , FXD, FILM: 169K OHM, 12 ,0 . 125W 


91637 


MFF1816G16902F 


R142 


321-0407-00 


B010100 


B119999X 


RES. , FXD, FILM: 169K OHM, 12,0. 125W 


91637 


MFF1816G16902F 



8-56 



REV OCT 1981 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. Eft 


Dscont 


R143 


301-0101-00 




R144 


304-0101-00 




R187 


321-0182-00 




R188 


321-0274-00 




R189 


311-1373-00 




R190 


315-0271-00 




R191 


315-0271-00 




R193 


311-0994-00 




R193 


311-1592-00 




R194 


311-0994-00 




R194 


311-1592-00 




R195 


311-0382-00 




R195 


311-1592-00 





R196 


311-0994-00 






R196 


311-1592-00 






R197 


321-0191-00 






R199 


321-0191-00 






R202 


315-0470-00 






R204 


315-0510-00 






R205 


315-0512-00 






R206 


321-0147-00 






R207 


321-0239-00 






R208 


315-0101-00 






R210 


315-0153-00 






R211 


315-0512-00 






R213 


315-0153-00 


B010100 


B119999 


R213 


315-0103-00 


B120000 




R214 


315-0153-00 


B010100 


BU9999 


R214 


315-0103-00 


B 120000 




R216 


315-0103-00 






R218 


315-0391-00 






R219 


315-0122-00 






R220 


315-0222-00 






R221 


315-0102-00 






R222 


315-0123-00 






R223 


315-0681-00 






R224 


315-0821-00 






R226 


315-0472-00 






R228 


315-0181-00 







Name & Description 


Mfr 

Code 


Mfr Part Number 


RES . ,FXD ,CMPSN: 100 OHM,5%,0.50W 


01121 


EB1015 


RES. ,FXD,CMPSN: 100 OHM,10%,1W 


01121 


GB1011 


RES. ,FXD, FILM: 768 OHM, 1%,0. 125W 
( R187 , OPTION 21 ONLY) 


91637 


MFF1816G768R0F 


RES . ,FXD ,FILM : 6 . 98K OHM, 1% , 0 . 125W 
( R188 , OPTION 21 ONLY) 


91637 


MFF1816G69800F 


RES. , VAR, NONWIR: 5K OHM,20%,1W 
(R189 , OPTION 21 ONLY) 


01121 


73U4G040L502M 


RES. ,FXD,CMPSN: 270 0HM,5%,0.25W 
(R190, OPTION 21 ONLY) 


01121 


CB2715 


RES. , FXD.CMPSN : 270 OHM,5%,0.25W 
(R191 , OPTION 21 ONLY) 


01121 


CB2715 


RES . , VAR, NONWIR: 2 . 5K OHM, 10% ,0 . 50W 
( R7844 OPTION 21 ONLY) 


01121 


WA1G048S252UA 


RES . , VAR, NONWIR: 2 . 5K OHM X 1M OHM, 20% , 0 . 50W 
(7844 OPTION 21 ONLY, R193 AND R195 FURNISHED 
AS A UNIT) 


01121 


14M414 


RES. , VAR, NONWIR: 2. 5K OHM, 10% , 0 . 50W 
(R7844 OPTION 21 ONLY) 


01121 


WA1G048S252UA 


RES. , VAR, NONWIR: 2. 5K OHM X 1M OHM, 20% , 0 . 50W 
(7844 OPTION 21 ONLY, R194 AND R196 FURNISHED 
AS A UNIT) 


01121 


14M414 


RES. , VAR, NONWIR: 1M OHM, 20% 
( R7844 OPTION 21 ONLY) 


11237 


300SF-41 1 58 


RES. , VAR, NONWIR: 2. 5K OHM X 1M OHM, 20%, 0. 50W 
(7844 OPTION 21 ONLY, R193 AND R195 FURNISHED 
AS A UNIT) 


01121 


14M414 


RES. , VAR, NONWIR: 2. 5K OHM, 10% , 0 . 50W 
(R7844 OPTION 21 ONLY) 


01121 


WA1G048S252UA 


RES . , VAR, NONWIR: 2 . 5K OHM X 1M OHM, 20% , 0 . 50W 
(7844 OPTION 21 ONLY, R194 AND R196 FURNISHED 
AS A UNIT) 


01121 


14M414 


RES. ,FXD, FILM: 953 OHM, 1%,0. 125W 
(R197 , OPTION 21 ONLY) 


91637 


MFF1816G953R0F 


RES . ,FXD , FILM: 953 OHM, 1% , 0 . 125W 
(R199, OPTION 21 ONLY) 


91637 


MFF1816G953R0F 


RES . .FXD.CMPSN : 47 OHM,5%,0.25W 


01121 


CB4705 


RES . ,FXD ,CMPSN : 51 OHM,5%,0.25W 


01121 


CB5105 


RES., FXD.CMPSN: 5. IK OHM,5%,0.25W 


01121 


CB5125 


RES., FXD, FILM: 332 OHM, 1%,0. 125W 


91637 


MFF1816G332R0F 


RES . ,FXD , FILM: 3 . OIK OHM, 1% , 0 . 1 25W 


91637 


MFF1816G30100F 


RES. .FXD.CMPSN: 100 0HM,5%,0.25W 


01121 


CB1015 


RES. .FXD.CMPSN: 15K OHM,5%,0.25W 


01121 


CB1535 


RES. .FXD.CMPSN: 5. IK OHM,5%,0.25W 


01121 


CB5125 


RES. .FXD.CMPSN: 15K OHM,5%,0.25W 


01121 


CB1535 


RES . ,FXD , CMPSN : 10K OHM,5%,0.25W 


01121 


CB1035 


RES. .FXD.CMPSN :15K OHM,5%,0.25W 


01121 


CB1535 


RES., FXD, CMPSN: 10K OHM,5%,0.25W 


01121 


CB1035 


RES., FXD, CMPSN :1 OK OHM,5%,0.25W 


01121 


CB1035 


RES. , FXD, CMPSN: 390 OHM,5%,0.25W 


01121 


CB3915 


RES. , FXD, CMPSN : 1 . 2K 0HM,5%,0.25W 


01121 


CB1225 


RES . ,FXD , CMPSN : 2 . 2K OHM,5%,0.25W 


01121 


CB2225 


RES. .FXD.CMPSN: IK OHM,5%,0.25W 


01121 


CB1025 


RES. , FXD, CMPSN: 12K OHM,5%,0.25W 


01121 


CB1235 


RES. .FXD.CMPSN: 680 0HM,5%,0.25W 


01121 


CB6815 


RES . , FXD.CMPSN : 820 OHM,5%,0.25W 


01121 


CB8215 


RES. .FXD.CMPSN : 4. 7K OHM,5%,0.25W 


01121 


CB4725 


RES. .FXD.CMPSN: 180 OHM,5%,0.25W 


01121 


CB1815 



REV OCT 1981 



8-57 




Replaceable Electrical Parts— 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eff Dscont 




Name & Description 


Mfr 

Code 


Mfr Part Number 


R230 


315-0100-00 






RES. 


, FXD ,CMPSN : 10 OHM, 57. , 0 . 25W 


01121 


CB1005 


R232 


315-0271-00 






RES. 


,FXD,CMPSN:270 OHM.5Z.0.25W 


01121 


CB2715 


R234 


315-0203-00 






RES. 


.FXD.CMPSN: 20K OHM.5Z.0.25W 


01121 


CB2035 


R236 


315-0103-00 






RES. 


, FXD.CMPSN : 10K OHM, 5% , 0 . 25W 


01121 


CB1035 


R238 


315-0271-00 






RES. 


, FXD.CMPSN : 270 OHM,5%,0.25W 


01121 


CB2715 


R240 


315-0512-00 






RES. 


, FXD, CMPSN : 5 . IK OHM,5%,0.25W 


01121 


CB5125 


R242 


315-0102-00 






RES. 


, FXD.CMPSN: IK OHM.5Z.0.25W 


01121 


CB1025 


R243 


315-0202-00 






RES. 


, FXD, CMPSN :2K 0HM.5Z.0.25W 


01121 


CB2025 


R246 


315-0102-00 






RES. 


, FXD.CMPSN : IK OHM.5Z.0.25W 


01121 


CB1025 


R247 


315-0202-00 






RES. 


, FXD , CMPSN : 2K OHM.5Z.0.25W 


01121 


CB2025 


R249 


315-0203-00 






RES. 


, FXD, CMPSN :20K OHM.5Z.0.25W 


01121 


CB2035 


R252 


315-0103-00 






RES. 


.FXD.CMPSN :1 OK OHM.5Z.0.25W 


01121 


CB1035 


R254 


315-0103-00 






RES. 


, FXD, CMPSN : 1 OK OHM.5Z.0.25W 


01121 


CB1035 


R255 


315-0203-00 






RES. 


, FXD, CMPSN :20K OHM.5Z.0.25W 


01121 


CB2035 


R258 


315-0391-00 






RES. 


, FXD, CMPSN: 390 OHM.5Z.0.25W 


01121 


CB3915 


R259 


315-0122-00 






RES. 


.FXD.CMPSN: 1.2K OHM,5%,0.25W 


01121 


CB1225 


R260 


315-0222-00 






RES. 


, FXD, CMPSN: 2. 2K OHM.5Z.0.25W 


01121 


CB2225 


R261 


315-0102-00 






RES. 


.FXD.CMPSN: IK OHM.5Z.0.25W 


01121 


CB1025 


R262 


315-0123-00 






RES. 


, FXD, CMPSN :12K OHM.5Z.0.25W 


01121 


CB1235 


R263 


315-0681-00 






RES. 


, FXD , CMPSN : 680 OHM,5%,0.25W 


01121 


CB6815 


R264 


315-0821-00 






RES. 


.FXD.CMPSN: 820 OHM,5%,0.25W 


01121 


CB8215 


R266 


315-0472-00 






RES. 


, FXD, CMPSN: 4. 7K OHM,5%,0.25W 


01121 


CB4725 


R268 


315-0391-00 






RES. 


.FXD.CMPSN: 390 OHM,5%,0.25W 


01121 


CB3915 


R269 


315-0122-00 






RES. 


.FXD.CMPSN: 1 .2K OHM.5Z.0.25W 


01121 


CB1225 


R270 


315-0222-00 






RES. 


, FXD, CMPSN: 2. 2K OHM.5Z.0.25W 


01121 


CB2225 


R271 


315-0102-00 






RES. 


.FXD.CMPSN: IK OHM,5%,0.25W 


01121 


CB1025 


R272 


315-0123-00 






RES. 


.FXD.CMPSN: 12K OHM,5%,0.25W 


01121 


CB1235 


R273 


315-0681-00 






RES. 


.FXD.CMPSN: 680 OHM.5Z.0.25W 


01121 


CB6815 


R274 


315-0821-00 






RES. 


.FXD.CMPSN: 820 OHM,5%,0.25W 


01121 


CB8215 


R276 


315-0472-00 






RES. 


, FXD, CMPSN: 4. 7K OHM.5X.0.25W 


01121 


CB4725 


R280 


315-0201-00 






RES. 


.FXD.CMPSN: 200 OHM,5%,0.25W 


01121 


CB2015 


R281 


315-0751-00 






RES. 


.FXD.CMPSN: 750 OHM.5Z.0.25W 


01121 


CB7515 


R283 


315-0103-00 






RES. 


.FXD.CMPSN: 1 OK OHM,5%,0.25W 


01121 


CB1035 


R284 


315-0201-00 






RES. 


.FXD.CMPSN: 200 OHM.5Z.0.25W 


01121 


CB2015 


R286 


315-0103-00 






RES. 


.FXD.CMPSN: 10K OHM.5Z.0.25W 


01121 


CB1035 


R288 


315-0683-00 






RES. 


, FXD, CMPSN :68K OHM,5%,0.25W 


01121 


CB6835 


R289 


315-0683-00 






RES. 


.FXD.CMPSN: 68K OHM,5%,0.25W 


01121 


CB6835 


R290 


321-0288-00 


B010100 


B030211X 


RES. 


, FXD , FILM: 9 . 76K OHM, 1% ,0 . 1 25W 


91637 


MFF1816G97600F 










(7844 ONLY) 






R290 


321-0288-00 


B010100 


B020123X 


RES. 


, FXD , FILM: 9 . 76K OHM , IX ,0 . 1 25W 


91637 


MFF1816G97600F 










(R7844 ONLY) 






R290 


321-0288-00 


XB120000 




RES. 


, FXD .FILM : 9 . 76K OHM, 1Z , 0 . 125W 


91637 


MFF1816G97600F 


R293 


321-0246-00 


B010100 


B030211X 


RES. 


, FXD .FILM: 3 . 57K OHM, 1Z ,0 . 125W 


91637 


MFF1816G35700F 










(7844 ONLY) 






R293 


321-0246-00 


B010100 


B020123X 


RES. 


, FXD, FILM: 3.57K OHM, 1% , 0 . 125W 


91637 


MFF1816G35700F 










(R7844 ONLY) 






R293 


321-0246-00 


XB120000 




RES. 


, FXD, FILM: 3 . 57K OHM, 1Z ,0. 125W 


91637 


MFF1816G35700F 


R296 


321-0288-00 






RES. 


, FXD .FILM : 9 . 76K OHM, 1Z , 0 . 125W 


91637 


MFF1816G97600F 


R298 


315-0152-00 






RES. 


, FXD, CMPSN :1.5K 0HM.5Z.0.25W 


01121 


CB1525 


R299 


321-0246-00 






RES. 


, FXD , FILM : 3 . 57K OHM, 1 Z , 0 . 125W 


91637 


MFF1816G35700F 


R301 


315-0510-00 






RES. 


.FXD.CMPSN: 51 0HM.5Z.0.25W 


01121 


CB5105 


R302 


315-0152-00 






RES. 


.FXD.CMPSN: 1.5K OHM.5Z.0.25W 


01121 


CB1525 


R303 


315-0103-00 


B010100 


B119999 


RES. 


.FXD.CMPSN: 1 OK OHM.5Z.0.25W 


01121 


CB1035 


R303 


315-0102-00 


B120000 




RES. 


.FXD.CMPSN: IK OHM.5Z.0.25W 


01121 


CB1025 


R304 


315-0152-00 






RES. 


.FXD.CMPSN: 1.5K OHM.5Z.0.25W 


01121 


CB1525 


R305 


315-0103-00 


B010100 


B119999 


RES. 


.FXD.CMPSN: 10K OHM.5Z.0.25W 


01121 


CB1035 


R305 


315-0102-00 


B120000 




RES. 


.FXD.CMPSN: IK 0HM.5Z.0.25W 


01121 


CB1025 



8-58 



REV OCT 1981 





Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eff Dscont 




Name & Description 


Mfr 

Code 


Mfr Part Number 


R306 


315-0510-00 






RES. 


, FXD, CMPSN : 51 OHM.5Z.0.25W 


01121 


CB5105 


R307 


321-0713-00 






RES. 


, FXD, FILM: 30 OHM, 1 Z ,0 . 125W 


91637 


MFF1816G30R00F 


R308 


321-0265-00 


B010100 


B119999X 


RES. 


, FXD, FILM: 5 . 62K OHM, 1 Z , 0 . 1 25W 


91637 


MFF1816G56200F 


R309 


321-0265-00 






RES. 


, FXD .FILM: 5 . 62K OHM, 1Z , 0 . 125W 


91637 


MFF1816G56200F 


R310 


321-0713-00 






RES. 


, FXD , FILM: 30 OHM, 1Z,0. 125W 


91637 


MFF1816G30R00F 


R31 1 


321-0265-00 






RES. 


, FXD , FILM: 5 . 62K OHM, 1Z , 0 . 125W 


91637 


MFF1816G56200F 


R312 


321-0265-00 






RES. 


, FXD , FILM: 5. 62K OHM, 1% , 0 . 125W 


91637 


MFF1816G56200F 


R314 


321-0222-00 






RES. 


, FXD, FILM: 2K OHM, 1Z,0. 125W 


91637 


MFF1816G20000F 


R315 


321-0222-00 






RES. 


, FXD , FILM : 2K OHM, 1% ,0 . 1 25W 


91637 


MFF1816G20000F 


R31 6 


315-0512-00 






RES. 


, FXD, CMPSN : 5 . IK OHM,5Z,0.25W 


01121 


CB5125 


R31 7 


315-0103-00 






RES. 


, FXD, CMPSN : 1 OK OHM,5Z,0.25W 


01121 


CB1035 


R319 


315-0682-00 


B010100 


B030211X 


RES. 


, FXD, CMPSN: 6. 8K OHM,5X,0.25W 


01121 


CB6825 










(7844 ONLY) 







RES . , FXD, CMPSN : 6 . 8K OHM, 5% , 0 . 25W 01121 CB6825 

(R7844 ONLY) 

RES. ,FXD,CMPSN:5.1K 0HM,5Z,0.25W 01121 CB5125 

(7844 ONLY) 

RES.,FXD,CMPSN:5.1K OHM,5Z,0.25W 01121 CB5125 

(R7844 ONLY) 

RES . ,FXD,CMPSN : 30K OHM,5%,0.25W 01121 CB3035 

(7844 ONLY) 

RES . , FXD , CMPSN : 30K 0HM,5Z,0.25W 01121 CB3035 

(R7844 ONLY) 

RES. , FXD, CMPSN: 2. 4K OHM,5%,0.25W 01121 CB2425 

(7844 ONLY) 

RES. , FXD, CMPSN: 2. 4K OHM,5Z,0.25W 01121 CB2425 

(R7844 ONLY) 

RES. , FXD, FILM: 25. 5K OHM, 1Z,0. 125W 91637 MFF1816G25501F 

RES . , FXD, FILM: 2 . IK OHM, 1Z ,0 . 125W 91637 MFF1816G21000F 

(7844 ONLY) 

RES . , FXD, FILM: 1 . 69K OHM , 1Z , 0 . 125W 91637 MFF1816G16900F 

(7844 ONLY) 

RES ., FXD, FILM: 2 . IK OHM, 1% , 0 . 125W 91637 MFF1816G21000F 

(R7844 ONLY) 

RES. , FXD, FILM: 1.69K OHM, 1Z.0.125W 91637 MFF1816G16900F 

( R7844 ONLY) 

RES ., FXD , FILM: 2 . 21K OHM, 1Z , 0 . 125W 91637 MFF1816G22100F 

(7844 ONLY) 

RES . ,FXD , FILM: 1 . 82K OHM, 1Z , 0 . 125W 91637 MFF1816G18200F 

(7844 ONLY) 

RES . ,FXD , FILM: 2 . 21K OHM, 1Z,0. 125W 91637 MFF1816G22100F 

(R7844 ONLY) 

RES., FXD, FILM :1.82K OHM, 1Z,0. 125W 91637 MFF1816G18200F 

(R7844 ONLY) 



R328 


315-0101-00 




RES. 


, FXD, CMPSN: 100 OHM,5Z,0.25W 


01121 


CB1015 


R329 


301-0182-00 




RES. 


, FXD, CMPSN :1.8K OHM,5Z,0.5W 


01121 


EB1825 


R330 


321-0222-00 




RES. 


, FXD .FILM: 2K OHM , 1Z , 0 . 125W 


91637 


MFF1816G20000F 


R331 


315-0510-00 




RES. 


, FXD, CMPSN : 51 0HM,5Z,0.25W 


01121 


CB5105 


R332 


315-0510-00 




RES. 


, FXD, CMPSN: 51 OHM,5Z,0.25W 


01121 


CB5105 


R334 


315-0151-00 




RES. 


, FXD, CMPSN: 150 OHM,5Z,0.25W 


01121 


CB1515 


R335 


311-1560-00 


XB 130000 


RES. 


, VAR , NONWIR : 5K OHM, 20Z ,0 . 50W 


73138 


91-82-0 


R336 


315-0100-00 




RES. 


, FXD, CMPSN: 10 OHM,5Z,0.25W 


01121 


CB1005 


R337 


315-0114-00 




RES. 


, FXD, CMPSN : 110K OHM,5Z,0.25W 


01121 


CB1145 


R338 


321-0239-00 




RES. 


, FXD , FILM: 3 . OIK OHM, 1Z,0. 125W 


91637 


MFF1816G30100F 


R339 


321-0239-00 




RES. 


, FXD .FILM : 3 . OIK OHM, 1Z , 0 . 125W 


91637 


MFF1816G30100F 


R340 


315-0472-00 


BO 1 0 1 00 B099999 


RES. 


, FXD, CMPSN: 4. 7K OHM,5Z,0.25W 


01121 


CB4725 



(7844, R7844 ONLY) 



R319 


315-0682-00 


B010100 


B020123X 


R320 


315-0512-00 


B010100 


B030211X 


R320 


315-0512-00 


BO 10 100 


B020123X 


R321 


315-0303-00 


B010100 


B030211X 


R321 


315-0303-00 


BO 10100 


B020123X 


R323 


315-0242-00 


B010100 


B03021 IX 


R323 


315-0242-00 


B010100 


B020123X 


R324 

R325 


321-0328-00 

321-0224-00 


B010100 


B030211 


R325 


321-0215-00 


B030212 




R325 


321-0224-00 


BO 10100 


B020123 


R325 


321-0215-00 


B020124 




R326 


321-0226-00 


B010100 


B030211 


R326 


321-0218-00 


B03.0212 




R326 


321-0226-00 


B010100 


B020123 


R326 


321-0218-00 


B020124 





REV OCT 1981 



8-59 



Replaceable Electrical Farts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eft Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Number 


R340 


315-0472-00 


B100000 


B100518 


RES . ,FXD , CMPSN :4 . 7K OHM.52.0.25W 


01121 


CB4725 










(R7844 ONLY) 






R340 


315-0752-00 


B100519 


B129999 


RES . , FXD , CMPSN : 7 . 5K OHM,52,0.25W 


01121 


CB7525 










(R7844 ONLY) 














(NOMINAL VALUE, SELECTED) 






R340 


315-0472-00 


B130000 




RES. , FXD, CMPSN: 4. 7K OHM,5%,0.25W 


01121 


CB4725 










(R7844 ONLY) 






R340 


315-0472-00 


B100000 


B 1 1 1034 


RES. , FXD, CMPSN: 4. 7K OHM,5%,0.25W 


01121 


CB4725 










(7844 ONLY) 






R340 


315-0752-00 


B111035 


8129999 


RES. , FXD, CMPSN: 7. 5K OHM,52,0.25W 


01121 


CB7525 










(7844 ONLY) 














(NOMINAL VALUE, SELECTED) 






R340 


315-0472-00 


B130000 




RES. , FXD, CMPSN: 4. 7K OHM, 5% ,0 . 25W 


01121 


CB4725 










(7844 ONLY) 






R341 


315-0510-00 






RES . ,FXD , CMPSN : 51 OHM, 52,0. 25W 


01121 


CB5105 


R342 


315-0152-00 






RES. , FXD, CMPSN : 1 . 5K OHM,52,0.25W 


01121 


CB1525 


R343 


315-0103-00 


B010100 


Bl 19999 


RES., FXD, CMPSN :1 OK OHM.52.0.25W 


01121 


CB1035 


R343 


315-0102-00 


B 120000 




RES., FXD, CMPSN: IK OHM,5%,0.25W 


01121 


CB1025 


R344 


315-0152-00 






RES. , FXD, CMPSN: 1 . 5K OHM,52,0.25W 


01121 


CB1525 


R345 


315-0103-00 


B010100 


B119999 


RES. , FXD, CMPSN: 10K OHM.52.0.25W 


01121 


CB1035 


R345 


321-0102-00 


B120000 




RES. , FXD, FILM: 113 OHM, 1% , 0 . 125W 


91637 


MFF1816G113R0F 


R346 


315-0510-00 






RES. , FXD, CMPSN: 51 OHM, 52 , 0. 25W 


01121 


CB5105 


R347 


321-0713-00 






RES. , FXD, FILM: 30 OHM, 12,0. 125W 


91637 


MFF1816G3OR00F 


R348 


321-0265-00 






RES . , FXD .FILM: 5 . 62K OHM, 1%,0. 125W 


91637 


MFF1816G56200F 


R349 


321-0265-00 






RES . , FXD , FILM: 5 . 62K OHM, 12,0. 125W 


91637 


MFF1816G56200F 


R350 


321-0713-00 






RES. , FXD, FILM: 30 OHM, 12,0. 125W 


91637 


MFF1816G30R00F 


R351 


321-0265-00 






RES. , FXD, FILM: 5 . 62K OHM, 12 , 0 . 125W 


91637 


MFF1816G56200F 


R352 


321-0265-00 


B010100 


B119999X 


RES. ,FXD,FILM:5.62K OHM, 12,0. 125W 


91637 


MFF1816G56200F 


R354 


321-0222-00 






RES. ,FXD,FILM:2K OHM, 12 , 0 . 125W 


91637 


MFF1816G20000F 


R355 


321-0222-00 






RES. , FXD, FILM: 2K OHM, 12 ,0 . 125W 


91637 


MFF1816G20000F 


R359 


315-0682-00 






RES. , FXD, CMPSN: 6. 8K OHM,52,0.25W 


01121 


CB6825 


R360 


315-0512-00 






RES . , FXD, CMPSN: 5 . IK OHM,52,0.25W 


01121 


CB5125 


R.361 


315-0303-00 






RES. , FXD, CMPSN : 30K OHM,52,0.25W 


01121 


CB3035 


R363 


315-0242-00 






RES. , FXD, CMPSN: 2. 4K OHM,52,0.25W 


01121 


CB2425 


R364 


321-0328-00 






RES. , FXD, FILM: 25. 5K OHM, 12,0. 125W 


91637 


MFF1816G25501F 


R365 


321-0224-00 


B010100 


B030211 


RES. ,FXD,FILM:2. IK OHM, 1 2 , 0 . 125W 


91637 


MFF1816G21000F 










(R7844 ONLY) 






R365 


321-0215-00 


B030212 




RES., FXD, FILM :1.69K OHM, 12,0. 125W 


91637 


MFF1816G16900F 










( R7844 ONLY) 






R365 


321-0224-00 


B010100 


B020123 


RES. , FXD, FILM: 2. IK OHM, 12 , 0 . 125W 


91637 


MFF1816G21000F 










(7844 ONLY) 






R365 


321-0215-00 


B020124 




RES . , FXD .FILM: 1 . 69K OHM, 1% ,0 . 125W 


91637 


MFF1816G16900F 










(7844 ONLY) 






R366 


321-0226-00 


B010100 


B030211 


RES. , FXD .FILM : 2 . 21K OHM, 12 ,0 . 1 25W 


91637 


MFF1816G22100F 










(R7844 ONLY) 






R366 


321-0218-00 


B030212 




RES. , FXD, FILM: 1.82K OHM, 12,0. 125W 


91637 


MFF1816G18200F 










( R7844 ONLY) 






R366 


321-0226-00 


BO 10 100 


B020123 


RES . , FXD , FILM: 2 . 21K OHM, 12 ,0 . 125W 


91637 


MFF1816G22100F 










(7844 ONLY) 






R366 


321-0218-00 


B020124 




RES . , FXD , FILM : 1 . 82K OHM, 12 , 0 . 125W 


91637 


MFF1816G18200F 










(7844 ONLY) 






R370 


321-0222-00 






RES. , FXD, FILM: 2K OHM , 12 , 0 . 125W 


91637 


MFF1816G20000F 


R371 


315-0510-00 






RES . , FXD , CMPSN : 5 1 OHM,52,0.25W 


01121 


CB5105 


R372 


315-0510-00 






RES. , FXD, CMPSN: 51 OHM, 52,0. 25W 


01121 


CB5105 


R373 


315-0361-00 






RES., FXD, CMPSN: 360 OHM,5%,0.25W 


01121 


CB3615 


R374 


315-0151-00 






RES. , FXD, CMPSN: 150 OHM,52,0.25W 


01121 


CB1515 


R376 


315-0100-00 






RES. , FXD, CMPSN: 10 OHM,52,0.25W 


01121 


CB1005 



8-60 



REV OCT 1981 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eff 


Dscont 


R377 


315-0114-00 


B010100 


B119999X 


R377 


315-0124-00 


B120000 




R378 


321-0239-00 






R379 


321-0239-00 






R380 


315-0472-00 


B010100 


B099999 


R380 


315-0472-00 


B100000 


B100518 


R380 


315-0752-00 


B100519 


B129999 


R380 


315-0472-00 


B 130000 




R381 


311-1560-00 


XB 130000 




R382 


315-0302-00 






R383 


315-0302-00 






R386 


311-1282-00 






R402 


321-0164-00 






R403 


321-0164-00 






R407 


315-0222-00 






R408 


315-0102-00 






R410 


321-1068-01 






R41 1 


323-0171-00 






R412 


321-0072-00 






R413 


323-0171-00 






R414 


321-1068-01 






R416 


317-0910-00 


B010100 


B059999 


R416 


311-1260-00 


B060000 




R416 


317-0910-00 


B010100 


B049999 


R416 


311-1260-00 


B050000 





R417 


317-0910-00 


B010100 


B059999 


R417 


317-0101-00 


B060000 




R417 


317-0910-00 


B010100 


B049999 


R417 


317-0101-00 


B050000 




R419 


315-0473-00 






R420 


315-0563-00 






R421 


323-0152-00 






R422 


323-0152-00 






R424 


315-0562-00 






R426 


315-0562-00 






R427 


315-0122-00 






R428 


315-0151-00 






R433 


322-0202-00 






R436 


321-0070-00 






R446 


317-0910-00 


BO 10100 


B059999 


R446 


311-1260-00 


B060000 




R446 


317-0910-00 


B010100 


B049999 


R446 


311-1260-00 


B050000 





Name & Description 

RES . , FXD , CMPSN : 1 10K OHM,5%,0.25W 
RES . , FXD , CMPSN : 1 20K OHM,5%,0.25W 
RES . ,FXD,FILM: 3 . OIK OHM, 1% ,0 . 125W 
RES . , FXD .FILM: 3 .OIK OHM, 1% ,0 . 125W 
RES . , FXD , CMPSN : 4. 7K OHM,5%,0.25W 
RES . , FXD, CMPSN: 4 . 7K OHM,5Z,0.25W 
(NOMINAL VALUE, SELECTED) 

RES . ,FXD,CMPSN: 7 . 5K OHM,5%,0.25W 
(NOMINAL VALUE, SELECTED) 

RES . , FXD , CMPSN : 4 . 7K OHM,5%,0.25W 
RES . , VAR, NONWIR: 5K OHM, 20%, 0. 50W 
RES. , FXD, CMPSN :3K OHM,5%,0.25W 
RES. , FXD, CMPSN :3K OHM,5%,0.25W 

RES., VAR, NONWIR :5K OHM, 10% ,0 . 30W 
RES . ,FXD , FILM: 499 OHM,1%,0.125W 
RES. , FXD, FILM: 499 OHM, 1%,0. 125W 
RES., FXD, CMPSN: 2. 2K OHM,5%,0.25W 
RES. , FXD, CMPSN: IK OHM,5%,0.25W 
RES . , FXD, FILM: 50 . 5 OHM, 0 . 5% ,0 . 125W 

RES., FXD, FILM: 590 OHM,1%,0.50W 
RES . , FXD, FILM: 54 . 9 OHM, 1%,0. 125W 
RES. , FXD, FILM: 590 OHM,1%,0.50W 
RES. , FXD, FILM : 50 . 5 OHM , 0. 5% ,0 . 1 25W 
RES. , FXD, CMPSN: 91 OHM, 5% , 0 . 125W 
(7844 ONLY) 

RES . , VAR, NONWIR : 250 OHM, 10% , 0 . 50W 
(7844 ONLY) 

RES . , FXD , CMPSN : 91 OHM, 5% ,0. 125W 
(R7844 ONLY) 

RES . , VAR, NONWIR : 250 OHM, 10% ,0 . 50W 
(R7844 ONLY) 

RES . , FXD , CMPSN : 91 OHM, 5% , 0 . 125W 
(7844 ONLY) 

RES. , FXD, CMPSN: 100 OHM,5%,0. 125W 
(7844 ONLY) 

RES. , FXD, CMPSN: 91 OHM,5%,0. 125W 
(R7844 ONLY) 

RES. , FXD, CMPSN :100 OHM,5%,0. 125W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 4 7K OHM,5%,0.25W 
RES., FXD, CMPSN : 56K OHM,5%,0.25W 
RES . ,FXD , FILM: 374 OHM,1%,0.50W 
RES . , FXD .FILM: 374 OHM,1%,0.50W 

RES. , FXD, CMPSN: 5. 6K OHM,5%,0.25W 
RES. , FXD, CMPSN: 5. 6K OHM,5%,0.25W 
RES., FXD, CMPSN :1.2K 0HM,5%,0.25W 
RES. , FXD, CMPSN: 150 OHM,5%,0.25W 
RES., FXD, FILM : 1 . 24K OHM,1%,0.25W 
RES. , FXD, FILM: 52. 3 OHM, 1%,0. 125W 

RES. , FXD , CMPSN : 91 OHM,5%,0. 125W 
(7844 ONLY) 

RES. , VAR, NONWIR: 250 OHM, 10% ,0 . 50W 
(7844 ONLY) 

RES . , FXD, CMPSN : 91 OHM , 5% ,0 . 125W 
( R7844 ONLY) 

RES . , VAR , NONWIR: 250 OHM, 10%, 0. 50W 
( R7844 ONLY) 



Mfr 

Code Mtr Part Number 

01121 CB1145 

01121 CB1245 

91637 MFF1816G30100F 

91637 MFF1816G30100F 

01121 CB4725 

01121 CB4725 



01121 CB7525 

01121 CB4725 

73138 91-82-0 

01121 CB3025 

01121 CB3025 

32997 3329W-L58-502 

91637 MFF1816G499R0F 

91637 MFF1816G499R0F 

01121 CB2225 

01121 CB1025 

91637 MFF1816G50R50D 

75042 CECT0-5900F 

91637 MFF1816G54R90F 

75042 CECT0-5900F 

91637 MFF1816G50R50D 

01121 BB9105 



32997 3329P-L58-251 

01121 BB9105 

32997 3329P-L58-251 



01121 BB9105 
01121 BB1015 
01121 BB9105 



01121 BB1015 

01121 CB4735 

01121 CB5635 

91637 MFF1226G374R0F 

91637 MFF1226G374R0F 

01121 CB5625 

01121 CB5625 

01121 CB1225 

01121 CB1515 

75042 CEBT0-1241F 

16299 NA55D52R3F 

01121 BB9105 

32997 3329P-L58-251 

01121 BB9105 



32997 3329P-L58-251 



REV OCT 1981 



8-61 





Replaceable Electrical Parts— 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eft Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Numbe 


R447 


317-0910-00 


B010100 


B059999 


RES . , FXD , CMPSN : 91 OHM , 5% , 0 . 1 25W 


01121 


BB9105 




— 






(7844 ONLY) 






R447 


317-0101-00 


B060000 




RES . , FXD , CMPSN : 100 OHM, 5% ,0 . 125W 


01121 


BB101 5 




— 






(7844 ONLY) 






R447 


317-0910-00 


B010100 


B049999 


RES , , FXD ,CMPSN : 9 1 OHM, 5%,0. 125W 


01121 


BB9105 











( R7844 ONLY) 






R447 


317-0101-00 


B050000 




RES . , FXD ,CMPSN : 100 OHM, 5% , 0. 125W 


01121 


BB1015 











(R7844 ONLY) 






R449 


315-0473-00 






RES . , FXD , CMPSN ; 4 7K 0HM,5%,0.25W 


01121 


CB4735 


R450 


315-0563-00 






RES . , FXD , CMPSN : 56K OHM, 57. , 0 . 25W 


01121 


CB5635 


R451 


323-0152-00 






RES . , FXD, FILM: 374 0HM,1%,0.50W 


91637 


MFF1226G374R0F 


R452 


323-0152-00 






RES. , FXD, FILM: 374 OHM,1%,0.50W 


91637 


MFF1 226G374R0F 


R453 


322-0202-00 






RES. , FXD, FILM: 1.24K OHM,1%,0.25W 


75042 


CEBT0-1241F 


R454 


315-0562-00 






RES. , FXD, CMPSN: 5. 6K OHM,5%,0.25W 


01121 


CB5625 


R456 


315-0562-00 






RES. , FXD, CMPSN: 5. 6K OHM,5%,0.25W 


01121 


CB5625 


R457 


315-0122-00 






RES., FXD, CMPSN :1.2K OHM, 5% ,0. 25W 


01121 


CB1225 


R458 


315-0151-00 






RES., FXD, CMPSN: 150 0HM,5%,0.25W 


01121 


CB1515 


R302 


321-0164-00 






RES. , FXD, FILM: 499 OHM, 1% ,0 . 1 25W 


91637 


MFF1816G499R0F 


R503 


321-0164-00 






RES. , FXD, FILM: 499 OHM.IZ.O. 125W 


91637 


MFF1816G499R0F 


R507 


315-0222-00 






RES. , FXD, CMPSN: 2. 2K OHM,5Z,0.25W 


01121 


CB2225 


R508 


315-0102-00 






RES., FXD, CMPSN: IK OHM, 5% , 0 . 25W 


01121 


CB1025 


R510 


321-1068-01 






RES. , FXD, FILM: 50. 5 OHM ,0 . 5% , 0. 125W 


91637 


MFF1816G50R50D 


R51 1 


323-0171-00 






RES. , FXD, FILM: 590 OHM,1Z,0.50W 


75042 


CECT0-5900F 


R512 


321-0072-00 






RES . , FXD , FILM: 54 . 9 OHM, 1X,0 . 125W 


91637 


MFF1816G54R90F 


R513 


323-0171-00 






RES . ,FXD , FILM: 590 0HM,1Z,0.50W 


75042 


CECT0-5900F 


R514 


321-1068-01 






RES. , FXD, FILM: 50. 5 OHM,0 . 5% , 0 . 125W 


91637 


MFF1816G50R50D 


R516 


317-0910-00 


B010100 


B059999 


RES. , FXD , CMPSN : 9 l OHM, 5Z , 0 . 125W 


01121 


BB9105 










(7844 ONLY) 






R516 


311-1260-00 


B060000 




RES . , VAR, NONWIR: 250 OHM, 10%, 0. 50W 


32997 


3329P-L58-251 










(7844 ONLY) 






R516 


317-0910-00 


B010100 


B049999 


RES. , FXD, CMPSN: 91 OHM, 5% ,0 . 125W 


01121 


BB9105 










(R7844 ONLY) 






R516 


311-1260-00 


B050000 




RES. , VAR, NONWIR: 250 OHM ,102,0. 50W 


32997 


3329P-L58-251 










( R7844 ONLY) 






R517 


317-0910-00 


B010100 


B059999 


RES . , FXD , CMPSN : 9 1 OHM, 5% , 0 . 125W 


01121 


BB9105 










(7844 ONLY) 






R517 


317-0101-00 


B060000 




RES . , FXD , CMPSN : 100 OHM , 5Z , 0 . 1 2 5W 


01121 


BB1015 




— 






(7844 ONLY) 






R517 


317-0910-00 


B010100 


B049999 


RES. , FXD, CMPSN: 91 OHM, 5% , 0 . 125W 


01121 


BB9105 




— 






(R7844 ONLY) 






R51 7 


317-0101-00 


B050000 




RES. , FXD, CMPSN: 100 OHM, 55! ,0. 125W 


01121 


BB1015 










( R7844 ONLY) 






R519 


315-0473-00 






RES. , FXD, CMPSN :47K OHM,5Z,0.25W 


01121 


CB4735 


R520 


315-0563-00 






RES., FXD, CMPSN : 56K 0HM,5%,0.25W 


01121 


CB5635 


R521 


323-0152-00 






RES. , FXD, FILM: 374 0HM,1Z,0.50W 


91637 


MFF1226G374R0F 


R522 


323-0152-00 






RES . , FXD, FILM: 374 0HM,1Z,0.50W 


91637 


MFF1226G374R0F 


R524 


315-0562-00 






RES. , FXD, CMPSN: 5. 6K 0BM,5Z,0.25W 


01121 


CB5625 


R528 


315-0151-00 






RES., FXD, CMPSN: 150 0HM.5Z.0.25W 


01121 


CB 1 515 


R533 


322-0202-00 






RES. , FXD, FILM: 1.24K OHM,1Z,0.25W 


75042 


CEBT0-1241F 


R536 


321-0070-00 






RES., FXD, FILM: 52. 3 OHM, 1Z ,0. 125W 


16299 


NA55D52R3F 


R546 


317-0910-00 


B010100 


B059999 


RES. , FXD, CMPSN: 91 OHM, 5Z ,0 . 125W 


01121 


BB9105 










(7844 ONLY) 






R546 


311-1260-00 


B060000 




RES. , VAR, NONWIR: 250 OHM , 10Z , 0 . 50W 


32997 


3329P-L58-251 










(7844 ONLY) 






R546 


317-0910-00 


B010100 


B049999 


RES. , FXD, CMPSN: 91 OHM, 5Z , 0 . 125W 


01121 


BB9105 










(R7844 ONLY) 






R546 


311-1260-00 


B050000 




RES. , VAR, NONWIR : 250 OHM, 10% , 0 . 50W 


32997 


3329P-L58-251 










(R7844 ONLY) 







8-62 



REV OCT 1981 





Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eft 


Dscont 


R547 


317-0910-00 


B010100 


B059999 


R547 


317-0101-00 


B060000 




R547 


317-0910-00 


B010100 


B049999 


R547 


317-0101-00 


B050000 




R549 


315-0473-00 






R550 


315-0563-00 






R551 


323-0152-00 






R552 


323-0152-00 






R553 


322-0202-00 






R554 


315-0562-00 






R555 


321-0070-00 






R556 


321-0070-00 






R558 


315-0151-00 






R601 


325-0108-00 


B010100 


B110794X 


R601 


325-0108-00 


B010100 


B100399X 


R602 


325-0044-00 


B010100 


B110794X 


R602 


325-0044-00 


B010100 


B100399X 


R603 


325-0108-00 


B010100 


B110794X 


R603 


325-0108-00 


B010100 


B100399X 


R604 


325-0044-00 


B010100 


B110794X 


R604 


325-0044-00 


B010100 


B100399X 


R605 


315-0112-00 


B010100 


B110794X 


R605 


315-0112-00 


B010100 


B100399X 


R606 


315-0152-00 


B010100 


B110794X 


R606 


315-0152-00 


B010100 


B100399X 


R607 


321-0133-00 


B010100 


B110794X 


R607 


321-0133-00 


BOIOIOO 


B100399X 


R608 


321-0133-00 


B010100 


B110794X 


R608 


321-0133-00 


BOIOIOO 


B100399X 


R610 


323-0131-00 


BOIOIOO 


B110794X 


R610 


323-0131-00 


BOIOIOO 


B100399X 


R612 


323-0131-00 


BOIOIOO 


B110794X 


R612 


323-0131-00 


BOIOIOO 


B100399X 



Name & Description 



RES . ,FXD, CMPSN : 91 0HM,5%,0. 125W 
(7844 ONLY) 

RES. ,FXD, CMPSN: 100 OHM,5%,0. 125W 
(7844 ONLY) 

RES . , FXD , CMPSN : 9 1 OHM, 52,0. 125W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 100 OHM, 52 ,0 . 1 25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 4 7K OHM,52,0.25W 
RES . , FXD, CMPSN: 56K 0HM,52,0.25W 
RES. , FXD .FILM: 374 OHM, 12,0. 50W 
RES. , FXD, FILM: 374 OHM,12,0.50W 

RES . ,FXD ,FILM: 1 . 24K OHM, 12,0. 25W 
RES. , FXD, CMPSN: 5. 6K OHM,52,0.25W 
RES . , FXD , FILM: 52 . 3 OHM , 12 , 0. 125W 
RES . , FXD, FILM: 52 . 3 OHM, 12 ,0 . 125W 
RES., FXD, CMPSN: 150 OHM,52,0.25W 
RES. , FXD, FILM: 105 OHM, 0. 52 ,0 . 05W 
(7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 105 OHM, 0. 52,0. 05W 
(R7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 100 OHM,0.52,0.05W 
(7844 OPTION 21 ONLY) 

RES., FXD, FILM: 100 OHM,0 . 52 ,0 . 05W 
(R7844 OPTION 21 ONLY) 

RES . , FXD, FILM: 105 OHM.O . 52 ,0 . 05W 
(7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 105 OHM, 0 . 5% ,0 . 05W 
(R7844 OPTION 21 ONLY) 

RES., FXD, FILM: 100 OHM , 0 . 52 ,0 . 05W 
(7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 100 OHM, 0 . 52 ,0. 05W 
(R7844 OPTION 21 ONLY) 

RES. , FXD, CMPSN: 1. IK OHM,52,0.25W 
(7844 OPTION 21 ONLY) 

RES. , FXD, CMPSN: 1. IK OHM,52,0.25W 
(R7844 OPTION 21 ONLY) 

RES . , FXD, CMPSN : 1 . 5K OHM,52,0.25W 
(7844 OPTION 21 ONLY) 

RES., FXD, CMPSN: 1.5K OHM, 52,0. 25W 
( R7844 OPTION 21 ONLY) 

RES . , FXD .FILM : 237 OHM, 12,0. 125W 
(7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 237 OHM, 12 , 0 . 125W 
(R7844 OPTION 21 ONLY) 

RES . , FXD, FILM: 237 OHM, 12 ,0 . 125W 
(7844 OPTION 21 ONLY) 

RES . ,FXD , FILM: 237 OHM, 12 ,0 . 125W 
(R7844 OPTION 21 ONLY) 

RES ., FXD, FILM: 226 OHM,12,0.50W 
(7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 226 OHM,12,D.50W 
( R7844 OPTION 21 ONLY) 

RES., FXD, FILM: 226 OHM,12,0.50W 
(7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 226 OHM, 12,0. 50W 
(R7844 OPTION 21 ONLY) 



Mfr 

Code Mfr Part Number 



01121 


BB9105 


01121 


BB1015 


01121 


BB9105 


01121 


BB1015 


01121 

01121 

91637 

91637 


CB4735 

CB5635 

MFF1226G374R0F 

MFF1226G374R0F 


75042 

01121 

16299 

16299 

01121 

14298 


CEBT0-1241F 

CB5625 

NA55D52R3F 

NA55D52R3F 

CB1515 

AME5O-C105R0D 


14298 


AME50-C105R0D 


03888 


PME50-F1000R0D 


03888 


PME 50-F 1 OOOROD 


14298 


AME50-C105R0D 


14298 


AME50-C105R0D 


03888 


PME50-F1000R0D 


03888 


PME 5 O-Fl OOOROD 


01121 


CB1125 


01121 


CB1125 


01121 


CB1525 


01121 


CB1525 


91637 


MFF1816G237R0F 


91637 


MFF1816G237R0F 


91637 


MFF1816G237R0F 


91637 


MFF1816G237R0F 


75042 


CECT0-2260F 


75042 


CECTO-2260F 


75042 


CECT0-2260F 


75042 


CECT0-2260F 



REV OCT 1981 



8-63 



Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eft Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Number 


R613 


321-0133-00 


B010100 


B110794X 


RES. ,FXD, FILM: 237 OHM, 1 % ,0 . 125W 
(7844 OPTION 21 ONLY) 


91637 


MFF1816G237R0F 


R613 


321-0133-00 


B010100 


B100399X 


RES. ,FXD, FILM: 237 OHM, 1%,0. 125W 
(R7844 OPTION 21 ONLY) 


91637 


MFF1816G237R0F 


R614 


321-0133-00 


B010100 


B110794X 


RES . , FXD.FILM : 237 OHM, 1%,0. 125W 
(7844 OPTION 21 ONLY) 


91637 


MFF1816G237R0F 


R614 


321-0133-00 


B010100 


B100399X 


RES . , FXD.FILM: 237 OHM,U,0.125W 
(R7844 OPTION 21 ONLY) 


91637 


MFF1816G237R0F 


R615 


315-0112-00 


B010100 


B110794X 


RES . , FXD,CMPSN : 1 . IK OHM,5%,0.25W 
(7844 OPTION 21 ONLY) 


01121 


CB1125 


R615 


315-0112-00 


B010100 


B100399X 


RES . , FXD, CMPSN : 1 . IK 0HM,5%,0.25W 
(R7844 OPTION 21 ONLY) 


01121 


CB1125 


R616 


315-0152-00 


B010100 


B110794X 


RES . , FXD , CMPSN : 1 . 5K OHM , 5% , 0 . 25W 
(7844 OPTION 21 ONLY) 


01121 


CB1525 


R61 6 


315-0152-00 


B010100 


B100399X 


RES. , FXD, CMPSN : 1 . 5K 0HM,5%,0.25W 
(R7844 OPTION 21 ONLY) 


01121 


CB1525 


R618 


317-0510-00 


B010100 


B110794X 


RES . , FXD, CMPSN : 51 0HM,5%,0. 125W 
(7844 OPTION 21 ONLY) 


01121 


BB5105 


R618 


317-0510-00 


B010100 


B100399X 


RES. , FXD, CMPSN: 51 OHM, 5% , 0 . 125W 
(R7844 OPTION 21 ONLY) 


01121 


BB5105 


R619 


315-0102-00 


B010100 


B110794X 


RES., FXD, CMPSN: IK OHM,5%,0.25W 
(7844 OPTION 21 ONLY) 


01121 


CB1025 


R619 


315-0102-00 


B010100 


B100399X 


RES., FXD, CMPSN: IK OHM, 5% , 0 . 25W 
(R7844 OPTION 21 ONLY) 


01121 


CB1025 


R620 


325-0053-00 


B010100 


B110794X 


RES. .FXD.FILM: 50 OHM,1Z,0.05W 
(7844 OPTION 21 ONLY) 


03888 


PME50C50R00F 


R620 


325-0053-00 


B010100 


B100399X 


RES. ,FXD,FILM:50 OHM,1%,0.05W 
(R7844 OPTION 21 ONLY) 


03888 


PME50C50ROOF 


R622 


325-0053-00 


B010100 


B110794X 


RES. ,FXD,FILM:50 OHM,U,0.05W 
(7844 OPTION 21 ONLY) 


03888 


PME50C50R00F 


R622 


325-0053-00 


B010100 


B100399X 


RES. , FXD, FILM: 50 OHM, 1% ,0 . 05W 
(R7844 OPTION 21 ONLY) 


03888 


PME50C50R00F 


R630 


315-0302-00 


B010100 


B029999 


RES. , FXD, CMPSN: 3K OHM,5%,0.25W 
(7844 OPTION 21 ONLY) 


01121 


CB3025 


R630 


315-0362-00 


B030000 


B110794X 


RES. , FXD, CMPSN: 3. 6K 0HM,5%,0.25W 
(7844 OPTION 21 ONLY) 


01121 


CB3625 


R630 


315-0302-00 


B010100 


B019999 


RES. , FXD, CMPSN : 3K OHM,5%,0.25W 
( R7844 OPTION 21 ONLY) 


01121 


CB3025 


R630 


315-0362-00 


B020000 


B100399X 


RES. , FXD, CMPSN: 3. 6K OHM,5%,0.25W 
(R7844 OPTION 21 ONLY) 


01121 


CB3625 


R631 


315-0202-00 


B010100 


B110794X 


RES. , FXD, CMPSN: 2K OHM,5%,0.25W 
(7844 OPTION 21 ONLY) 


01121 


CB2025 


R631 


315-0202-00 


B010100 


B100399X 


RES. , FXD, CMPSN :2K OHM,5%,0.25W 
(R7844 OPTION 21 ONLY) 


01121 


CB2025 


R632 


321-0150-00 


B010100 


B110794X 


RES . , FXD, FILM: 357 OHM, 1X,0. 125W 
(7844 OPTION 21 ONLY) 


91637 


MFF1816G357R0F 


R632 


321-0150-00 


B010100 


B100399X 


RES. , FXD, FILM: 357 OHM, 1% ,0. 125W 
(R7844 OPTION 21 ONLY) 


91637 


MFF1816G357R0F 


R634 


321-0150-00 


B010100 


B110794X 


RES. , FXD, FILM: 357 OHM , 1% ,0 . 125W 
(7844 OPTION 21 ONLY) 


91637 


MFF1816G357R0F 


R634 


321-0150-00 


B010100 


B100399X 


RES. , FXD, FILM: 357 OHM, 1% ,0 . 125W 
( R7844 OPTION 21 ONLY) 


91637 


MFF1816G357R0F 


R641 


315-0101-00 


B010100 


B110794X 


RES. , FXD, CMPSN: 100 0HM,5%,0.25W 
(7844 OPTION 21 ONLY) 


01121 


CB1015 


R641 


315-0101-00 


B010100 


B100399X 


RES. , FXD, CMPSN: 100 OHM, 5% ,0 . 25W 
(R7844 OPTION 21 ONLY) 


01121 


CB1015 



8-64 



REV OCT 1981 





Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eft 


Dscont 


R642 


315-0272-00 


B010100 


B110794X 


R642 


315-0272-00 


B010100 


B100399X 


R644 


321-0150-00 


B010100 


B110794X 


R644 


321-0150-00 


B010100 


B100399X 


R646 


321-0150-00 


B010100 


B110794X 


R646 


321-0150-00 


B010100 


B100399X 


R654 


315-0202-00 


B010100 


B110794X 


R654 


315-0202-00 


B010100 


B100399X 


R701 


325-0108-00 


B010100 


B110794X 


R701 


325-0108-00 


B010100 


B100399X 


R702 


325-0044-00 


B010100 


B110794X 


R702 


325-0044-00 


B010100 


B100399X 


R703 


325-0108-00 


B010100 


B110794X 


R703 


325-0108-00 


B010100 


B100399X 


R704 


325-0044-00 


B010100 


B110794X 


R704 


325-0044-00 


B010100 


B100399X 


R705 


315-0112-00 


B010100 


B110794X 


R705 


315-0112-00 


B010100 


B100399X 


R706 


315-0152-00 


B010100 


B110794X 


R706 


315-0152-00 


B010100 


B100399X 


R707 


321-0133-00 


B010100 


B110794X 


R707 


321-0133-00 


B010100 


B100399X 


R708 


321-0133-00 


B010100 


B110794X 


R708 


321-0133-00 


B010100 


B100399X 


R710 


323-0131-00 


B010100 


B110794X 


R710 


323-0131-00 


B010100 


B100399X 


R712 


323-0131-00 


B010100 


B110794X 


R712 


323-0131-00 


B010100 


B100399X 


R713 


321-0133-00 


B010100 


B110794X 



Name & Description 



RES . , FXD , CMPSN : 2. 7K 0HM,5%,0.25W 
(7844 OPTION 21 ONLY) 

RES . ,FXD , CMPSN : 2 . 7K OHM, 52 , 0. 25W 
(R7844 OPTION 21 ONLY) 

RES., FXD, FILM: 357 OHM, 1% ,0. 125W 
(7844 OPTION 21 ONLY) 

RES . , FXD, FILM: 357 OHM, 1% ,0 . 125W 
(R7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 357 OHM, 12 ,0 . 125W 
(7844 OPTION 21 ONLY) 

RES . , FXD FILM: 357 OHM, 12,0 . 125W 
(R7844 OPTION 21 ONLY) 

RES., FXD, CMPSN :2K OHM,52,0.25W 
(7844 OPTION 21 ONLY) 

RES., FXD, CMPSN :2K 0HM,52,0.25W 
(R7844 OPTION 21 ONLY) 

RES., FXD, FILM: 105 OHM, 0 . 5% ,0 .05W 
(7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 105 OHM,0 . 5% , 0 . 05W 
( R7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 100 OHM,0 . 5% ,0 . 05W 
(7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 100 OHM, 0 . 5% ,0 . 05W 
(R7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 105 OHM, 0. 5% ,0 . 05W 
(7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 105 OHM, 0 . 5% ,0. 05W 
(R7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 100 OHM, 0 . 5% , 0. 05W 
(7844 OPTION 21 ONLY) 

RES., FXD, FILM: 100 OHM.O . 5% , 0 . 05W 
(R7844 OPTION 21 ONLY) 

RES . , FXD, CMPSN : 1 . IK OHM,52,0.25W 
(7844 OPTION 21 ONLY) 

RES . , FXD , CMPSN : 1 . IK OHM,5%,0.25W 
( R7844 OPTION 21 ONLY) 

RES., FXD, CMPSN : 1 . 5K OHM,52,0.25W 
(7844 OPTION 21 ONLY) 

RES . , FXD , CMPSN : 1 . 5K 0HM,5%,0.25W 
(R7844 OPTION 21 ONLY) 

RES . , FXD, FILM : 237 OHM, 1% ,0 . 125W 
(7844 OPTION 21 ONLY) 

RES. ,FXD,FILM:237 OHM, 1%,0. 125W 
(R7844 OPTION 21 ONLY) 

RES . , FXD, FILM: 237 OHM, 12,0. 125W 
(7844 OPTION 21 ONLY) 

RES. ,FXD,FILM:237 OHM, 12,0. 125W 
(R7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 226 OHM,1Z,0.50W 
(7844 OPTION 21 ONLY) 

RES . ,FXD , FILM: 226 OHM, 12,0. 50W 
(R7844 OPTION 21 ONLY) 

RES., FXD, FILM: 226 OHM,1Z,0.50W 
(7844 OPTION 21 ONLY) 

RES., FXD, FILM: 226 OHM,1%,0.50W 
( R7844 OPTION 21 ONLY) 

RES . ,FXD , FILM: 237 OHM, 12 , 0 . 125W 
(7844 OPTION 21 ONLY) 



Mfr 

Code 

01121 

01121 

91637 

91637 

91637 

91637 

01121 

01121 

14298 

14298 

03888 

03888 

14298 

14298 

03888 

03888 

01121 

01121 

01121 

01121 

91637 

91637 

91637 

91637 

75042 

75042 

75042 

75042 

91637 



Mfr Part Number 

CB2725 

CB2725 

MFF1816G357R0F 

MFF1816G357R0F 

MFF1816G357R0F 

MFF1816G357R0F 

CB2025 

CB2025 

AME50-C105R0D 

AME50-C 105R0D 

PME50-F1000R0D 

PME50-F1000R0D 

AME50-C105R0D 

AME50-C105R0D 

PME50-F1000R0D 

PME50-F1000ROD 

CB1125 

CB1125 

CB1525 

CB1525 

MFF1816G237R0F 

MFF1816G237R0F 

MFF1816G237R0F 

MFF1816G237R0F 

CECT0-2260F 

CECT0-2Z60F 

CECT0-2260F 

CECT0-2260F 

MFF1816G237R0F 



REV OCT 1981 



8-65 



Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eft 


Dscont 


R713 


321-0133-00 


B010100 


B100399X 


R714 


321-0133-00 


B010100 


B110794X 


R714 


321-0133-00 


B010100 


B100399X 


R715 


315-0112-00 


B010100 


B110794X 


R715 


315-0112-00 


B010100 


B100399X 


R716 


315-0152-00 


B010100 


B110794X 


R716 


315-0152-00 


B010100 


B100399X 


R718 


317-0510-00 


B010100 


B110794X 


R718 


317-0510-00 


B010100 


B100399X 


R719 


315-0102-00 


B010100 


B110794X 


R719 


315-0102-00 


B010100 


B100399X 


R720 


325-0053-00 


B010100 


B110794X 


R720 


325-0053-00 


B010100 


B100399X 


R722 


325-0053-00 


B010100 


B110794X 


R722 


325-0053-00 


B010100 


B100399X 


R731 


315-0101-00 


B010100 


B110794X 


R731 


315-0101-00 


B010100 


B100399X 


R732 


315-0272-00 


B010100 


B110794X 


R732 


315-0272-00 


B010100 


B100399X 


R741 


315-0101-00 


B010100 


B110794X 


R741 


315-0101-00 


B010100 


B100399X 


R742 


315-0272-00 


B010100 


B110794X 


R742 


315-0272-00 


B010100 


B100399X 


R744 


321-0150-00 


B010100 


B110794X 


R744 


321-0150-00 


B010100 


B100399X 


R746 


321-0150-00 


B010100 


B110794X 


R746 


321-0150-00 


B010100 


B100399X 


R752 


315-0101-00 


BO 10100 


B110794X 



Name & Description 



RES. , FXD, FILM: 237 OHM, 1% ,0 . 125W 
(R7844 OPTION 21 ONLY) 

RES., FXD, FILM: 237 OHM, 1%,0. 125W 
(7844 OPTION 21 ONLY) 

RES. ,FXD,FILM:237 OHM, 1% ,0 . 125W 
(R7844 OPTION 21 ONLY) 

RES . ,FXD, CMPSN : 1 . IK OHM, 5Z ,0 . 25W 
(7844 OPTION 21 ONLY) 

RES., FXD, CMPSN:]. IK OHM,5X,0.25W 
(R7844 OPTION 21 ONLY) 

RES. , FXD, CMPSN: 1 .5K OHM,5%,0.25W 
(7844 OPTION 21 ONLY) 

RES. , FXD, CMPSN: 1 . 5K 0HM,5%,0.25W 
(R7844 OPTION 21 ONLY) 

RES., FXD, CMPSN: 51 OHM, 5% , 0 . 125W 
(7844 OPTION 21 ONLY) 

RES. , FXD .CMPSN: 31 OHM, 5% , 0 . I 25W 
(R7844 OPTION 21 ONLY) 

RES., FXD, CMPSN: IK OHM,5%,0.25W 
(7844 OPTION 21 ONLY) 

RES . , FXD, CMPSN : IK OHM,5X,0.25W 
(R7844 OPTION 21 ONLY) 

RES. ,FXD,FILM:50 OHM,1%,0.05W 
(7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 50 OHM,1Z,0.05W 
(R7844 OPTION 21 ONLY) 

RES . , FXD, FILM : 50 OHM,1%,0.05W 
(7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 50 OHM,1%,0.05W 
(R7844 OPTION 2.1 ONLY) 

RES. , FXD, CMPSN: 100 OHM,5%,0.25W 
(7844 OPTION 21 ONLY) 

RES., FXD, CMPSN: 100 OHM,5%,0.25VJ 
(R7844 OPTION 21 ONLY) 

RES . , FXD, CMPSN: 2 . 7K OHM,5Z,0.25W 
(7844 OPTION 21 ONLY) 

RES. , FXD, CMPSN: 2. 7K OHM,5Z,0.25W 
(R7844 OPTION 21 ONLY) 

RES., FXD, CMPSN: 100 OHM,5Z,0.25W 
(7844 OPTION 21 ONLY) 

RES. , FXD, CMPSN: 100 OHM,5Z,0.25W 
(R7844 OPTION 21 ONLY) 

RES . ,FXD , CMPSN : 2 . 7K OHM,5Z,0.25W 
(7844 OPTION 21 ONLY) 

RES. , FXD, CMPSN: 2. 7K 0HM,5%,0.25W 
( R7844 OPTION 21 ONLY) 

RES., FXD, FILM: 357 OHM, 1Z ,0 . 125W 
(7844 OPTION 21 ONLY) 

RES., FXD, FILM: 357 OHM, 1Z ,0. 125W 
(R7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 357 OHM,1Z,0.125W 
(7844 OPTION 21 ONLY) 

RES. , FXD, FILM: 357 OHM,1Z,0.125W 
( R7844 OPTION 21 ONLY) 

RES. , FXD, CMPSN: 100 OHM,5Z,0.25W 
(7844 OPTION 21 ONLY) 



Mir 

Code Mfr Part Number 



91637 


MFF1816G237R0F 


91637 


MFF1816G237R0F 


91637 


MFF 1 8 1 6G2 3 7R0F 


01121 


CB1125 


01121 


CB1125 


01121 


CB1525 


01121 


CB1525 


01121 


BB5105 


01121 


BB5105 


01121 


CB1025 


01121 


CB1025 


03888 


PME50C50R00F 


03888 


PME50C50ROOF 


03888 


PME50C50R00F 


03888 


PME50C50R00F 


01121 


CB1015 


01121 


CB1015 


01121 


CB2725 


01121 


CB2725 


01121 


CB1015 


01121 


CB1015 


01121 


CB2725 


01121 


CB2725 


91637 


MFF1816G357R0F 


91637 


MFF1816G357R0F 


91637 


MFF1816G357R0F 


91637 


MFF1816G357R0F 


01121 


CB1015 



8-66 



REV OCT 1981 





Replaceable Electrical Parts— 7844/R7844 Service 



Tektronix Serial/Model No. Mfr 

Ckt No. Part No. Eft Dscont Name & Description Code Mfr Part Number 



R752 


315-0101-00 


B010100 B100399X RES ., FXD , CMPSN: 100 0HM,5%,0.25W 

(R7844 OPTION 21 ONLY) 


01121 


CB1015 


R802 


323-0187-00 


RES. 


, FXD, FILM: 866 OHM,1%,0.50W 


75042 


CECT0-8660F 


R805 


321-0098-00 


RES. 


, FXD, FILM; 102 OHM, 1Z ,0 . 125W 


91637 


MFF1816G102R0F 


R806 


321-0088-00 


RES. 


, FXD, FILM: 80.6 OHM, 1% ,0 . 125W 


91637 


MFF1816G80R60F 


R808 


321-0088-00 


RES. 


, FXD, FILM: 80.6 OHM, 1Z,0 . 125W 


91637 


MFF1816G80R60F 


R809 


321-0098-00 


RES. 


, FXD, FILM: 102 OHM, 1Z,0. 125W 


91637 


MFF1816G102R0F 


R812 


315-0182-00 


RES. 


, FXD , CMPSN : 1 . 8K 0HM,5Z,0.25W 


01121 


CB1825 


R814 


315-0153-00 


RES. 


, FXD.CMPSH: 15K OHM,5Z,0.25W 


01121 


CB1535 


R816 


321-0218-00 


RES. 


, FXD, FILM; 1 .82K OHM, 1Z , 0 . 125W 


91637 


MFF1816G18200F 


R818 


315-0911-00 


RES. 


, FXD, CMPSN : 910 0HM,5Z,0.25W 


01121 


CB9115 


R822 


323-0187-00 


RES. 


, FXD, FILM:: 866 OHM,1Z,0.50W 


75042 


CECT0-8660F 


R825 


321-0098-00 


RES. 


, FXD, FILM; 102 OHM, 1% ,0 . 125W 


91637 


MFF1816G102R0F 


R826 


321-0088-00 


RES. 


, FXD, FILM.: 80. 6 OHM, 1Z,0. 125W 


91637 


MFF 181 6G80R60F 


R828 


321-0088-00 


RES. 


, FXD, FILM: 80. 6 OHM, 1% , 0 . 125W 


91637 


MFF1816G80R60F 


R829 


321-0098-00 


RES. 


, FXD, FILM : 102 OHM, 1% , 0 . 125W 


91637 


MFF1816G102R0F 


R842 


323-0187-00 


RES. 


, FXD, FILM : 866 OHM,1Z,0.50W 


75042 


CECT0-8660F 


R845 


321-0098-00 


RES. 


, FXD, FILM: 102 OHM, 1Z , 0. 125W 


91637 


MFF1816G102R0F 


R846 


321-0088-00 


RES. 


, FXD , FILM : 80 . 6 OHM, 1Z,0. 125W 


91637 


MFF 181 6G80R60F 


R848 


321-0088-00 


RES. 


, FXD, FILM 80.6 OHM, 1Z,0. 125W 


91637 


MFF 181 6G80R60F 


R849 


321-0098-00 


RES. 


, FXD, FILM: 102 OHM, 1Z,0. 125W 


91637 


MFF1816G102R0F 


R852 


315-0182-00 


RES. 


, FXD, CMPSN : 1.8K 0HM,5Z,0.25W 


01121 


CB1825 


R854 


315-0153-00 


RES. 


, FXD, CMPSN :15K OHM,5Z,0.25W 


01121 


CB1535 


R856 


321-0218-00 


RES. 


, FXD, FILM ::1.82K OHM, 1Z,0. 125W 


91637 


MFF1816G18200F 


R858 


315-0911-00 


RES. 


, FXD, CMPSN : 910 OHM,5Z,0.25W 


01121 


CB9115 


R862 


323-0187-00 


RES. 


, FXD, FILM ;:866 OHM,1Z,0.50W 


75042 


CECT0-8660F 


R865 


321-0098-00 


RES. 


, FXD, FILM : 102 OHM, 1Z,0. 125W 


91637 


MFF1816G102R0F 


R866 


321-0088-00 


RES. 


, FXD, FILM: 80. 6 OHM, 1%,0. 125W 


91637 


MFF 1 8 1 6G80R60F 


R868 


321-0088-00 


RES. 


, FXD , FILM : 80 . 6 OHM, 1Z ,0 . 125W 


91637 


MFF1816G80R60F 


R869 


321-0098-00 


RES. 


, FXD, FILM: 102 OHM, 1% ,0 . 125W 


91637 


MFF1816G102R0F 


R902 


321-0321-07 


RES. 


, FXD, FILM: 21. 5K OHM, 0 . 1% , 0 . 125W 


91637 


MFF1816C21501B 


R903 


315-0823-00 


RES. 


, FXD, CMPSN :82K OHM,5Z,0.25W 


01121 


CB8235 


R904 


311-1566-00 


RES. 


, VAR.NONWIR: 200 OHM, 20Z ,0 . 50W 


73138 


91-88-0 


R905 


321-0822-06 


RES. 


, FXD, FILM :1.76K OHM, 0 . 25Z , 0 . 1 25W 


91637 


MFF1816C17600C 


R907 


321-0258-00 


RES. 


, FXD , FILM :: 4 . 7 5K OHM, 1Z,0. 125W 


91637 


MFF1816G47500F 


R908 


315-0362-00 


RES. 


, FXD, CMPSN: 3. 6K OHM,5Z,0.25W 


01121 


CB3625 


R909 


321-0321-07 


RES. 


, FXD, FILM : 21 . 5K OHM.O. 1Z,0. 125W 


91637 


MFF1816C21501B 


R912 


308-0307-00 


RES. 


, FXD , WW : 5K 0HM,1Z,3W 


91637 


RS2B-B50000F 


R913 


321-0166-00 


RES. 


, FXD, FILM : 523 OHM, 1Z,0. 125W 


91637 


MFF1816G523R0F 


R914 


315-0223-00 


RES. 


, FXD, CMPSN :22K OHM.5Z.0.25W 


01121 


CB2235 


R915 


311-1225-00 


RES. 


, VAR.NONWIR: IK OHM, 20Z , 0 . 50W 


32997 


3386F-T04-102 


R916 


315-0512-00 


RES. 


, FXD , CMPSN : 5 . 1 K OHM,5Z,0.25W 


01121 


CB5125 


R918 


321-1611-07 


RES. 


, FXD, FILM: 550 OHM,0. 1Z,0. 125W 


91637 


MFF1816C550R0B 


R920 


321-1612-07 


RES. 


, FXD,FILM:4.455K OHM,0. 1Z ,0. 125W 


91637 


MFF1816C44550B 


R922 


321-1611-07 


RES. 


, FXD , FILM : 550 0HM,0 . 1Z ,0 . 125W 


91637 


MFF1816C550R0B 


R924 


321-1612-07 


RES. 


, FXD, FILM ;4.455K OHM,0. 1Z,0. 125W 


91637 


MFF1816C44550B 


R926 


321-1612-07 


RES. 


, FXD, FILM .4.455K OHM ,0 . 1Z ,0 . 1 25W 


91637 


MFF1816C44550B 


R928 


321-1611-07 


RES. 


, FXD, FILM : 550 OHM,0. 1Z,0. 125W 


91637 


MFF1816C550R0B 


R930 


321-0813-07 


RES. 


, FXD, FILM: 495 OHM,0. 1Z,0. 125W 


91637 


MFF1816C495R0B 


R935 


311-1548-00 


RES. , VAR, NONW [R : 5K OHM, 10Z , 0 . 75W 
( R935 , OPTION 22 ONLY) 


73138 


89-100-1 


R940 


315-0101-00 


RES. 


, FXD, CMPSN: 100 OHM,5Z,0.25W 


01121 


CB1015 


R942 


315-0106-00 


RES. 


, FXD, CMPSN : 10M OHM,5Z,0.25W 


01121 


CB1065 


R944 


315-0103-00 


RES. 


, FXD, CMPSN: 10K OHM,5Z,0.25W 


01121 


CB1035 


R946 


315-0512-00 


RES. 


, FXD, CMPSN: 5. IK OHM,5Z,0.25W 


01121 


CB5125 


R950 


316-0103-00 


RES. 


, FXD, CMPSN : 1 OK OHM, 10Z ,0 . 25W 


01121 


CB1031 


R934 


315-0244-00 


RES. 


, FXD, CMPSN :240K 0HM,5Z,0.25W 


01121 


CB2445 



REV OCT 1981 



8-67 



Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix Serial/Model No. 
Part No. Eff Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Number 


R956 


316-0104-00 




RES . , FXD , CMPSN : 1 OOK OHM, 10% ,0. 25W 


01121 


CB1041 


R958 


311-1548-00 




RES. , VAR,NONWIR: 5K OHM, 10%,0. 75W 


73138 


89-100-1 


R960 


311-1587-00 




RES . ,VAR,NONWIR: 10K OHM,20%,1W 


01121 


12M435 








( R960 , FURNISHED AS A UNIT WITH S960) 






R962 


315-0105-00 




RES., FXD, CMPSN :1M OHM, 5% ,0 . 25W 


01121 


CB1055 


R964 


315-0106-00 




RES. , FXD, CMPSN :10M OHM,5%,0.25W 


01121 


CB1065 


R966 


315-0153-00 




RES. , FXD, CMPSN: 15K OHM,5%,0.25W 


01121 


CB1535 


R970 


315-0101-00 




RES. , FXD, CMPSN: 100 OHM, 5% , 0 . 25W 


01121 


CB1015 


R972 


315-0106-00 




RES. , FXD, CMPSN: 10M OHM,5%,0.25W 


01121 


CB1065 


R974 


315-0104-00 




RES. , FXD, CMPSN: 100K OHM,5%,0.25W 


01121 


CB1045 


R976 


311-1548-00 




RES. ,VAR,N0NWIR:5K OHM, 10% , 0 . 75W 


73138 


89-100-1 


R978 


311-1588-00 




RES. ,VAR,N0NWIR:5K OHM,20%,1W 


01121 


20M718 








(R978, FURNISHED AS A UNIT WITH S978) 






R980 


311-1238-00 




RES . , VAR , NONWIR : 5K OHM, 10% , 0 . 50W 


73138 


72-27-0 


R984 


315-0270-00 




RES . , FXD , CMPSN : 27 OHM,5%,0.25W 


01121 


CB2705 


R994 


315-0102-00 




RES. , FXD, CMPSN: IK OHM,5%,0.25W 


01121 


CB1025 


R1002 


315-0301-00 




RES. , FXD, CMPSN: 300 OHM,5%,0.25W 


01121 


CB3015 


R1004 


315-0123-00 




RES. , FXD, CMPSN : 12K OHM,5%,0.25W 


01121 


CB1235 


R1006 


315-0331-00 




RES. , FXD, CMPSN: 330 OHM,5%,0.25W 


01121 


CB3315 


R1008 


315-0301-00 




RES. , FXD, CMPSN: 300 OHM,5%,0.25W 


01121 


CB3015 


R1010 


315-0101-00 




RES., FXD, CMPSN: 100 OHM,5%,0.25W 


01121 


CB1015 


R1011 


315-0101-00 




RES., FXD, CMPSN: 100 OHM,5%,0.25W 


01121 


CB1015 


R1012 


315-0101-00 




RES., FXD, CMPSN: 100 OHM,5%,0.25W 


01121 


CB1015 


R1013 


321-0153-00 




RES. , FXD, FILM: 383 OHM, 1%,0. 125W 


91637 


MFF1816G383R0F 


R1014 


315-0473-00 




RES. , FXD, CMPSN: 4 7K OHM,5%,0.25W 


01121 


CB4735 


R1016 


301-0102-00 




RES. , FXD, CMPSN: IK OHM,5%,0.50W 


01121 


EB1025 


R1017 


321-0191-00 




RES. , FXD, FILM: 953 OHM, 1%,0. 125W 


91637 


MFF1816G953R0F 


R1018 


321-0187-00 




RES. ,FXD,FILM:866 OHM, 1%,0. 125W 


91637 


MFF1 8 1 6G866R0F 


R1019 


315-0202-00 




RES. , FXD, CMPSN :2K OHM,5%,0.25W 


01121 


CB2025 


R1021 


315-0101-00 




RES. , FXD, CMPSN: 100 OHM,5%,0.25W 


01121 


CB1015 


R1022 


315-0301-00 




RES. , FXD, CMPSN: 300 OHM,5%,0.25W 


01121 


CB3015 


R1023 


321-0153-00 




RES. , FXD, FILM: 383 OHM, 1%,0. 125W 


91637 


MFF1816G383R0F 


R1024 


315-0123-00 




RES. , FXD, CMPSN: 12K OHM,5%,0.25W 


01121 


CB1235 


R1026 


315-0331-00 




RES. , FXD, CMPSN: 330 OHM,S%,0.25W 


01121 


CB3315 


R1028 


315-0301-00 




RES. , FXD, CMPSN: 300 OHM,5%,0.25W 


01121 


CB3015 


R1030 


315-0101-00 




RES. , FXD, CMPSN: 100 OHM,5%,0.25W 


01121 


CB1015 


R1032 


315-0101-00 




RES. , FXD, CMPSN: 100 OHM,5%,0.25W 


01121 


CB1015 


R1034 


315-0473-00 




RES. , FXD, CMPSN: 4 7K OHM,5%,0.25W 


01121 


CB4735 


R1036 


301-0102-00 




RES. , FXD, CMPSN: IK 0HM,5%,0.50W 


01121 


EB1025 


R1037 


321-0191-00 




RES . , FXD , FILM: 953 OHM, 1%,0. 125W 


91637 


MFF1816G953R0F 


R1038 


321-0187-00 




RES. , FXD , FILM : 866 OHM, 1%,0. 125W 


91637 


MFF1816G866R0F 


R1039 


315-0202-00 




RES. , FXD, CMPSN :2K OHM,5%,0.25W 


01121 


CB2025 


R1040 


315-0470-00 




RES . , FXD , CMPSN : 47 OHM,5%,0.25W 


01121 


CB4705 


R1042 


321-0272-00 




RES . , FXD, FILM: 6 . 65K OHM , 1% , 0 . 125W 


91637 


MFF1816G66500F 


R1044 


315-0153-00 




RES., FXD, CMPSN :15K OHM,5%,0.25W 


01121 


CB1535 


R1046 


323-0275-00 




RES . , FXD, FILM: 7 . 1 5K OHM,1%,0.50W 


75042 


CECT0-7151F 


R1048 


315-0132-00 




RES., FXD, CMPSN : 1 . 3K OHM,5%,0.25W 


01121 


CB1325 


R1050 


315-0432-00 




RES. , FXD, CMPSN: 4. 3K OHM,5%,0.25W 


01121 


CB4325 


R1052 


321-0262-00 




RES . , FXD , FILM: 5 . 23K OHM, 1% , 0 . 1 25W 


91637 


MFF1816G52300F 


R1054 


315-0302-00 




RES., FXD, CMPSN :3K OHM,5%,0.25W 


01121 


CB3025 


R1056 


321-0189-00 




RES. , FXD, FILM: 909 OHM, 1%,0. 125W 


91637 


MFF1816G909R0F 


R1060 


315-0470-00 




RES., FXD, CMPSN: 47 OHM,5%,0.25W 


01121 


CB4705 


R1062 


321-0272-00 




RES . , FXD , FILM : 6 . 65K OHM , 1% ,0 . 125W 


91637 


MFF1816G66500F 


R1064 


315-0153-00 




RES., FXD, CMPSN :15K OHM,5%,0.25W 


01121 


CB1535 


R1066 


323-0275-00 




RES . , FXD, FILM: 7 . 15K OHM,1%,0.50W 


75042 


CECTO-71 51F 


R1068 


315-0132-00 




RES., FXD, CMPSN: 1.3K 0HM,5%,0.25W 


01121 


CB1325 


R1070 


315-0432-00 




RES. , FXD, CMPSN: 4. 3K OHM,5%,0.25W 


01121 


CB4325 



8-68 



REV OCT 1981 




Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Mode! No. 

Eft Dscont 


Neime & Description 


Mfr 

Code 


Mfr Part Number 


R1072 


321-0262-00 






RES . ,FXD ,FILM: 5 . 23K OHM, 1% ,0. 125W 


91637 


MFF1816G52300F 


RIO 74 


315-0302-00 






RES . ,FXD , CMPSN : 3K OHM,5%,0.25W 


01121 


CB3025 


R1076 


321-0189-00 






RES. ,FXD, FILM: 909 OHM, 1% ,0. 125W 


91637 


MFF1816G909R0F 


R1080 


301-0431-00 






RES. ,FXD, CMPSN: 430 0HM,5Z,0.50W 


01121 


EB4315 


R1082 


301-0431-00 






RES. ,FXD, CMPSN: 430 OHM.5Z.0.50W 


01121 


EB4315 


R1090 


315-0101-00 






RES. ,FXD, CMPSN: 100 CHM, 5% , 0 . 25W 


01121 


CB1015 


R1102 


315-0470-00 






RES . , FXD , CMPSN : 47 OHM,5%,0.25W 


01121 


CB4705 


R1104 


321-0345-00 






RES . , FXD , FILM: 38 . 3K OHM , 1 % , 0 . 1 2 5W 


91637 


MFF1816G38301F 


R1108 


315-0101-00 






RES. , FXD, CMPSN: 100 C*HM,5%,0.25W 


01121 


CB1015 


R 1 1 1 2 


315-0470-00 






RES. , FXD, CMPSN: 47 OHM,5%,0.25W 


01121 


CB4705 


R1114 


321-0345-00 






RES. , FXD, FILM: 38. 3K OHM, 1% ,0 . 125W 


91637 


MFF1816G38301F 


R1118 


315-0101-00 






RES. , FXD, CMPSN: 100 OHM,5%,0.25W 


01121 


CB1015 


R1120 


315-0102-00 






RES. , FXD, CMPSN: IK 0HM,5Z,0.25W 


01121 


CB1025 


R1122 


315-0110-00 






RES. , FXD, CMPSN: 11 OHM,5%,0.25W 


01121 


CB1105 


R1124 


301-0271-00 






RES. , FXD, CMPSN: 270 OHM,5%,0.50W 


01121 


EB2715 


R1126 


315-0220-00 






RES. , FXD, CMPSN: 22 OHM,5Z,0.25W 


01121 


CB2205 


R1128 


301-07:,l-00 






RES., FXD, CMPSN: 7 50 OHM,5%,0.50W 


01121 


EB7515 


R1132 


315-0220-00 






RES. , FXD, CMPSN: 22 0RM,5%,0.25W 


01121 


CB2205 


R1134 


321-0243-00 






RES. , FXD, FILM: 3.32K OHM, 1% ,0 . 125W 


91637 


MFF1816G33200F 


R1136 


321-0264-00 






RES. , FXD, FILM: 5.49K OHM, 1%,0. 125W 


91637 


MFF1816G54900F 


R1140 


315-0472-00 






RES. , FXD, CMPSN: 4. 7K OHM,5%,0.25W 


01121 


CB4725 


R1142 


315-0202-00 






RES. , FXD, CMPSN :2K OHM,5%,0.25W 


01121 


CB2025 


R1143 


315-0240-00 






RES. , FXD, CMPSN: 24 OHM,5%,0.25W 


01121 


CB2405 


R1146 


321-0324-00 






RES. , FXD, FILM: 23. 2K OHM, 1% , 0 . 125W 


91637 


MFF1816G23201F 


R1148 


321-0357-00 






RES. , FXD, FILM: 51. IK OHM, 1% ,0. 125W 


91637 


MFF1816G51 10 IF 


R1150 


323-0227-00 






RES . , FXD, FILM: 2 . 26K OHM,1%,0.50W 


75042 


CECT0-2261F 


R1 152 


301-0822-00 






RES., FXD, CMPSN: 8. 2K OHM,5%,0.50W 


01121 


EB8225 


RU54 


301-0822-00 






RES. , FXD, CMPSN: 8. 2K OHM,5Z,0.50W 


01121 


EB8225 


R1162 


323-0307-00 


B010100 


B010134 


RES . , FXD .FILM: 1 5 . 4K OHM,1%,0.50W 


75042 


CECTO-1 542F 










(7844 ONLY) 






R1162 


323-0306-00 


B010135 


B109999 


RES., FXD, FILM: 15K OHM,1%,0.50W 


75042 


CECTO-1 502F 










(7844 ONLY) 






R1162 


323-0308-00 


B1 10000 




RES. , FXD, FILM: 15. 8K OHM,1%,0.50W 


75042 


CECT0-1582F 










(7844 ONLY) 






R1162 


323-0307-00 


B010100 


B010112 


RES. , FXD, FILM: 15. 4K OHM,1%,0.50W 


75042 


CECTO-1 542F 










(R7844 ONLY) 






R1162 


323-0306-00 


B010113 


B099999 


RES., FXD, FILM: 15K OHM,1X,0.50W 


75042 


CECTO-1 502F 










(R7844 ONLY) 






R1162 


323-0308-00 


B100000 




RES . , FXD .FILM: 15 . 8K OHM,1%,0.50W 


75042 


CECTO-l 582F 










( R7844 ONLY) 






R1164 


315-0205-00 






RES. , FXD, CMPSN :2M OHM,5%,0.25W 


01121 


CB2055 


R1168 


311-1266-00 






RES . .VAR.NONWIR: 2 . 5K OHM , 10X ,0 . 50W 


32997 


3329P-L58-252 


R1172 


321-0219-00 






RES. , FXD, FILM .-1.87K OHM, 1Z,0. 125W 


91637 


MFF1816G18700F 


R1174 


321-0342-00 






RES. , FXD, FILM: 35. 7K OHM, 1 %,0 . 1 25W 


91637 


MFF1816G35701F 


R1180 


311-1230-00 






RES. , VAR.NONWIR : 20K OHM, 20% , 0 . 50W 


32997 


3386F-T04-203 


R1182 


315-0912-00 






RES. , FXD, CMPSN: 9. IK OHM,5%,0.25W 


01121 


CB9125 


R1186 


315-0151-00 






RES., FXD, CMPSN: 150 0HM,5X,0.25W 


01121 


CB1515 


R1 192 


315-0100-00 






RES. , FXD, CMPSN: 10 OHM,5%,0.25W 


01121 


CB1005 


R1194 


315-0100-00 






RES. , FXD, CMPSN: 10 0HM,5%,0.25W 


01121 


CB1005 


R1196 


315-0100-00 






RES. , FXD, CMPSN: 10 OHM,5%,0.25W 


01121 


CB1005 


R1198 


315-0100-00 






RES. , FXD, CMPSN: 10 0HM,5%,0.25W 


01121 


CB1005 


R1205 


304-0270-00 






RES . , FXD , CMPSN : 27 OHM,10Z,1W 


01121 


GB2701 


R1208 


304-0104-00 


B010100 


B 100644 


RES. , FXD, CMPSN : 100K 0HM,10%,1W 


01121 


GB1041 










(7844 ONLY) 






R1208 


304-0473-00 


B100645 




RES., FXD, CMPSN: 4 7K OHM,10%,1W 


01121 


CB4731 










(7844 ONLY) 






R1208 


304-0104-00 


B010100 


B090319 


RES. , FXD, CMPSN: 100K OHM,10%,1W 


01121 


GB1041 










(R7844 ONLY) 







REV OCT 1981 



8-69 




Replaceable Electrical Parts— 7844/R7844 Service 



Ckt No. 



Tektronix Serial/Model No. 
Part No. Eff Dscont 



Name & Description 



Mfr 

Code Mfr Part Number 



R1208 


304-0473-00 


B090320 




R1210 


303-0304-00 






R 1 2 1 3 


304-0104-00 


B010100 


B100644 


R1213 


304-0473-00 


B100645 




R1213 


304-0104-00 


B010100 


B090319 


R1213 


304-0473-00 


B090320 




R1219 


302-0565-00 






R1221 


304-0154-00 






R1225 


316-0471-00 






R1231 


307-0057-00 






R1232 


316-0220-00 






R1236 


316-0103-00 






R1238 


315-0333-00 


XB141775 


B141859 


R1238 


315-0332-00 


B141860 




R1238 


315-0333-00 


XB140840 


B140879 


R1238 


315-0332-00 


B140880 




R1239 


307-0057-00 






R1240 


316-0220-00 






R1242 


315-0753-00 






R1243 


315-0274-00 






R1244 


316-0270-00 






R1245 


316-0101-00 






R1246 


315-0561-00 


B010100 


B100644 


R1246 


315-0391-00 


B100645 




R1246 


315-0561-00 


B010100 


B090919 


R1246 


315-0391-00 


B090920 




R1247 


316-0684 7 00 






R1248 


302-0332-00 






R1249 


316-0101-00 






R1253 


316-0473-00 


B010100 


B142489 


R1253 


315-0473-00 


B142490 




R1253 


316-0473-00 


B010100 


B141189 


R1253 


315-0473-00 


B141190 




R1256 


316-0562-00 


B010100 


B142489 


R1256 


315-0562-00 


B142490 




R1256 


316-0562-00 


B010100 


B141189 



RES . , FXD , CMPSN : 47K OHM,10%,1W 
(R7844 ONLY) 

RES . , FXD , CMPSN : 300K 0HM,5%,1W 
RES . , FXD, CMPSN : 100K OHM,10%,1W 
(7844 ONLY) 

RES. , FXD, CMPSN: 4 7K OHM,10%,1W 
(7844 ONLY) 

RES., FXD , CMPSN : 1 OOK OHM,10%,1W 
(R7844 ONLY) 

RES. , FXD, CMPSN :47K OHM,10%,1W 
(R7844 ONLY) 

RES., FXD, CMPSN: 5. 6M OHM, 10%, 0. 50W 
RES. , FXD, CMPSN : 150K OHM,10%,1W 
RES. , FXD, CMPSN: 470 OHM , 10% ,0 . 25W 
RES., FXD, CMPSN: 5.1 OHM,5%,0.50W 
RES., FXD, CMPSN: 22 OHM, 10% , 0. 25W 
RES., FXD, CMPSN : 10K OHM, 10% , 0 . 25W 

RES. , FXD, CMPSN: 3 3K OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 3. 3K OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN :33K 0HM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 3. 3K 0HM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD , CMPSN : 5 . 1 OHM,5%,0.50W 
RES. , FXD, CMPSN: 22 OHM, 10% ,0 . 25W 
RES. , FXD, CMPSN: 75K OHM,5%,0.25W 
RES. , FXD, CMPSN: 2 70K OHM,5%,0.25W 

RES. , FXD, CMPSN: 27 OHM, 10%, 0. 25W 
RES. , FXD, CMPSN: 100 OHM, 10% , 0 . 25W 
RES. , FXD, CMPSN: 560 OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 390 OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 560 OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD, CMPSN : 390 0HM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD, CMPSN : 680K OHM, 10%, 0. 25W 
RES. , FXD, CMPSN: 3. 3K OHM, 10% ,0 . 50W 

RES. , FXD, CMPSN: 100 OHM, 10% , 0 . 25W 
RES. ,FXD,CMPSN:47K OHM, 10% ,0 . 25W 
(7844 ONLY) 

RES., FXD, CMPSN: 4 7K OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 4 7K OHM, 10% , 0 . 25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 4 7K OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 5. 6K OHM, 10%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 5. 6K OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 5. 6K OHM, 10% ,0. 25W 
(R7844 ONLY) 



01121 


GB4731 


01121 


GB3045 


01121 


GB1041 


01121 


GB4731 


01121 


GB1041 


01121 


GB4731 


01121 


EB5651 


01121 


GB1541 


01121 


CB4711 


01121 


EB51G5 


01121 


CB2201 


01121 


CB1031 


01121 


CB3335 


01121 


CB3325 


01121 


CB3335 


01121 


CB3325 


01121 


EB51G5 


01121 


CB2201 


01121 


CB7535 


01121 


CB2745 


01121 


CB2701 


01121 


CB1011 


01121 


CB5615 


01121 


CB3915 


01121 


CB5615 


01121 


CB3915 


01121 


CB6841 


01121 


EB3321 


01121 


CB1011 


01121 


CB4731 


01121 


CB4735 


01121 


CB4731 


01121 


CB4735 


01121 


CB5621 


01121 


CB5625 


01121 


CB5621 



8-70 



REV OCT 1981 





Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 

Ckt No. Part No. Eff Dscont Name & Description 



R1256 


315-0562-00 


B141190 




R1257 


316-0223-00 


B010100 


B142489 


R1257 


315-0223-00 


B142490 




R1257 


316-0223-00 


B010100 


B141189 


R1257 


315-0223-00 


B141190 




R1259 


316-0562-00 


B010100 


B142489 


R1259 


315-0562-00 


B142490 




R1259 


316-0562-00 


B010100 


B141189 


R1259 


315-0562-00 


B141190 




R1261 


316-0104-00 


B010100 


B142489 


R1261 


315-0104-00 


B142490 




R1261 


316-0104-00 


B010100 


B141189 


R1261 


315-0104-00 


B141190 




R1267 


316-0154-00 


B010100 


B142489 


R1267 


315-0154-00 


B142490 




R1267 


316-0154-00 


B010100 


B141189 


R1267 


315-0154-00 


B141190 




R1269 


316-0224-00 


B010100 


B142489 


R1269 


315-0224-00 


B142490 




R1269 


315-0224-00 


B010100 


B141189 


R1269 


315-0224-00 


B141190 




R1270 


316-0123-00 


B010100 


B142489 


R1270 


315-0123-00 


B142490 




R1270 


316-0123-00 


B010100 


B141189 


R1270 


315-0123-00 


B141190 




R1271 


315-0431-00 


B010100 


B100644 


R1271 


315-0301-00 


B100645 




R1271 


315-0431-00 


B010100 


B090319 


R1271 


315-0301-00 


B090320 





RES. , FXD, CMPSN: 5. 6K OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD ,CMPSN : 22K OHM, 10% ,0 . 25W 
(7844 ONLY) 

RES . , FXD,CMPSN : 22K OHM,5%,0.25W 
(7844 ONLY) 

RES. ,FXD,CMPSN: 22K OHM, 10Z ,0 . 25W 
(R7844 ONLY) 

RES. ,FXD,CMPSN: 22K 0HM,5Z,0.25W 
(R7844 ONLY) 

RES. ,FXD,CMPSN:5.6K OHM,10Z,O.25W 
(7844 ONLY) 

RES . ,FXD,CMPSN : 5 . 6K OHM,5Z,0.25W 
(7844 ONLY) 

RES . , FXD , CMPSN : 5 . 6K OHM, 10Z , 0 . 25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 5. 6K OHM,5Z,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN : 100K OHM, 10Z,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 100K OHM,5Z,0.25W 
(7844 ONLY) 

RES., FXD, CMPSN :100K OHM, 10% , 0. 25W 
(R7844 ONLY) 

RES., FXD, CMPSN :100K OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN :150K OHM, 10% ,0 . 25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 150K OHM.5Z.0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN : 150K OHM, 10Z ,0 . 25W 
(R7844 ONLY) 

RES . , FXD, CMPSN : 150K OHM,5Z,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN : 220K OHM, 10Z ,0. 25W 
(7844 ONLY) 

RES . , FXD , CMPSN : 220K OHM,5Z,0.25W 
(7844 ONLY) 

RES., FXD, CMPSN : 220K 0HM,5Z,0.25W 
(R7844 ONLY) 

RES . , FXD, CMPSN : 220K OHM,5Z,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 12K OHM,10%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN :12K 0HM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN :12K OHM, 10Z ,0 . 25W 
(R7844 ONLY) 

RES., FXD, CMPSN :12K OHM,5Z,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 430 OHM,5Z,0.25W 
(7844 ONLY) 

RES., FXD, CMPSN: 300 OHM,5Z,0.25W 
(7844 ONLY) 

RES. ,FXD,CMPSN:430 OHM.5Z.0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 300 OHM,5Z,0.25W 
(R7844 ONLY) 



Mfr 

Code Mfr Part Number 



01121 


CB5625 


01121 


CB2231 


01121 


CB2235 


01121 


CB2231 


01121 


CB2235 


01121 


CB5621 


01121 


CB5625 


01121 


CB5621 


01121 


CB5625 


01121 


CB1041 


01121 


CB1045 


01121 


CB1041 


01121 


CB1045 


01121 


CB1541 


01121 


CB1545 


01121 


CB1541 


01121 


CB1545 


01121 


CB2241 


01121 


CB2245 


01121 


CB2245 


01121 


CB2245 


01121 


CB1231 


01121 


CB1235 


01121 


CB1231 


01121 


CB1235 


01121 


CB4315 


01121 


CB3015 


01121 


CB4315 


01121 


CB3015 



REV OCT 1981 



8-71 




Replaceable Electrical Parts— 7844/R7844 Service 



Tektronix 
Ckt No. Part No. 



Serial/Model No. 

Eff Dscont 



Name & Description 



Mfr 

Code Mfr Part Number 



R1272 


316-0470-00 


B010100 


B142489 


R1272 


315-0470-00 


B142490 




R1272 


316-0470-00 


B010100 


B141 L89 


R1272 


315-0470-00 


B141190 




R1277 


316-0560-00 


B010100 


B142489 


R1277 


315-0560-00 


B142490 




R1277 


316-0560-00 


B010100 


B141189 


R1277 


315-0560-00 


B141190 




R1279 


316-0181-00 


B010100 


B141749 


R1279 


315-0560-00 


B141750 




R1279 


316-0181-00 


B010100 


B140319 


R1279 


315-0560-00 


B140820 




R1284 


315-0471-00 






R1285 


321-0313-00 






R1286 


315-0102-00 






R1287 


321-0001-00 






R1292 


321-0425-00 






R1293 


311-1239-00 






R1294 


321-0283-00 






R1296 


321-0282-00 






R1297 


315-0102-00 






R1300 


321-0366-00 






R1301 


316-0153-00 


B010100 


B142489 


R1301 


315-0153-00 


B142490 




R1301 


316-0153-00 


B010100 


B141189 


R1301 


315-0153-00 


B141190 




R1302 


315-0512-00 






R1304 


321-0286-00 


B010100 


B141769 


R1304 


321-0282-00 


B141770 




R1304 


321-0286-00 


B010100 


B140829 


R1304 


321-0282-00 


B140830 




R1305 


321-0339-00 






R1326 


302-0563-00 






R1371 


315-0304-00 






F1373 


315-0113-00 






R1375 


315-0362-00 







RES . , FXD, CMPSN : 47 OHM, 10% , 0 . 25W 
(7844 ONLY) 

RES . , FXD ,CMPSN : 47 0HM,5%,0.25W 
(7844 ONLY) 

RES . ,FXD , CMPSN : 47 OHM, 10% ,0 . 25W 
(R7844 ONLY) 



RES. , FXD, CMPSN: 47 OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 56 OHM, 10% , 0 . 25W 
(7844 ONLY) 

RES., FXD, CMPSN: 56 OHM,5%,0.25W 
(7844 ONLY) 



RES. , FXD, CMPSN: 56 OHM, 10% ,0 . 25W 
(R7844 ONLY) 

RES., FXD, CMPSN: 56 OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 180 OHM, 10%,0.25W 
(7844 ONLY) 



RES. , FXD, CMPSN: 56 OHM,5%,0.25W 
(7844 ONLY) 

RES., FXD, CMPSN: 180 OHM, 10% ,0. 25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 56 OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 470 OHM,5%,0.25W 
RES. , FXD, FILM: 17. 8K OHM, 1%,0. 125W 
RES., FXD, CMPSN: IK OHM,5X,0.25W 
RES. , FXD, FILM: 10 OHM, 1% , 0 . 125W 
RES. ,FXD,FILM:261K. OHM, 1% ,0 . 1 25W 
RES . , VAR , NONWIR : 2 . 5K OHM, 10%,0.50W 

RES. ,FXD,FILM:8.66K OHM, 1%,0. 125W 
RES. ,FXD,FILM:8.45K OHM, 1%,0. 125W 
RES., FXD, CMPSN: IK 0HM,5%,0.25W 
RES. , FXD, FILM: 63. 4K OHM, 1%,0. 125W 
RE S . , FXD , CMPSN : 1 5K OHM , 1 0% , 0 . 2 5W 
(7844 ONLY) 



RES. , FXD, CMPSN :15K OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN : 15K OHM, 10% ,0 . 25W 
(R7844 ONLY) 

RES., FXD, CMPSN :15K 0HM,5X,0.25W 
(R7844 ONLY) 



RES., FXD, CMPSN: 5. IK OHM,5%,0.25W 
RES., FXD, FILM: 9. 31K OHM, 1%,0. 125W 
(7844 ONLY) 

RES., FXD, FILM: 8. 45K OHM, 1% , 0 . 125W 
(7844 ONLY) 

RES. , FXD, FILM: 9.31 K OHM , 1 X , 0 . 1 25W 
(R7844 ONLY) 



RES . ,FXD , FILM: 8 ,45K OHM, 1%,0. 125W 
( R7844 ONLY) 

RES. , FXD, FILM: 33. 2K OHM, 1%,0. 125W 
RES., FXD, CMPSN :56K 0HM,10%,0.50W 
RES. , FXD, CMPSN : 300K OHM,5%,0.25W 
RES ., FXD , CMPSN : 1 IK 0HM,5%,0.25W 



RES. , FXD, CMPSN: 3. 6K OHM,5%,0.25W 



01121 


CB4701 


01121 


CB4705 


01121 


CB4701 


01121 


CB4705 


01121 


CB5601 


01121 


CB5605 


01121 


CB5601 


01121 


CB5605 


01121 


CB1811 


01121 


CB5605 


01121 


CB1811 


01121 


CB5605 


01121 

91637 

01121 

75042 

91637 

73138 


CB4715 

MFF1816G17801F 

CB1025 

CEATO-IOROOF 

MFF1816G26102F 

72-26-0 


91637 

91637 

01121 

91637 

01121 


MFF1816G86600F 

MFF1816G84500F 

CB1025 

MFF1816G63401F 

CB1531 


01121 


CB1535 


01121 


CB1531 


01121 


CB1535 


01121 

91637 


CB5125 

MFF1816G93100F 


91637 


MFF1816G84500F 


91637 


MFF1816G93100F 


91637 


MFF1816G84500F 


91637 

01121 

01121 

01121 


MFF1816G33201F 

EB5631 

CB3045 

CB1135 


01121 


CB3625 



8-72 



REV OCT 1981 




Replaceable Electrical Parts— 7844/R7844 Service 





Tektronix 


Serial/Model No. 


Ckt No. 


Part No. 


Eff 


Dscont 


R1529 


301-0123-00 






R1531 


315-0101-00 






R1533 


316-0222-00 






R1535 


316-0331-00 






R1537 


308-0703-00 






R1539 


316-0471-00 






R1543 


321-0289-00 






R1544 


316-0103-00 






R1545 


315-0243-00 






R1548 


315-0.562-00 






R1549 


316-0221-00 






R1551 


308-0702-00 






R1562 


316-0274-00 






R1564 


321-0924-07 






R1565 


321-0926-07 






R1566 


315-0622-00 






R1567 


316-0273-00 






R1568 


316-0473-00 






R1570 


316-0334-00 






R1571 


316-0103-00 






R1573 


315-0471-00 


B010100 


B141744 


R1573 


315-0561-00 


B141745 





R1573 


315-0471-00 


B010100 


B140834 


R1573 


315-0561-00 


B140835 




R1574 


315-0562-00 






R1577 


316-0223-00 






R1579 


315-0152-00 






R1580 


315-0750-00 






R1583 


316-0103-00 






R1586 


316-0681-00 






R1587 


308-0701-00 






R1589 


316-0470-00 






R1591 


316-0470-00 






R1598 


307-0036-00 






R1625 


302-0563-00 






R1627 


316-0821-00 


B010100 


B142469 


R1627 


315-0821-00 


B142470 




R1627 


316-0821-00 


B010100 


B141189 


R1627 


315-0821-00 


B141190 




R1629 


315-0332-00 


B010100 


B141744 


R1629 


315-0112-00 


B141745 




R1629 


315-0332-00 


B010100 


B140834 


R1629 


315-0112-00 


B140835 




R1631 


316-0150-00 


B010100 


B142469 



Name & Description 



RES. ,FXD,CMPSN:12K OHM, 52,0. 50W 
RES. ,FXD,CMPSN: 100 OHM, 5% , 0 . 25W 
RES. .FXD.CMPSN: 2. 2K OHM, 105! ,0 . 25W 
RES. ,FXD,CMPSN: 330 OHM, 10%,0. 25W 
RES . , FXD , WW : 1 . 8 OHM,5Z,2W 
RES., FXD.CMPSN: 470 OHM, 10% ,0 . 25W 

RES., FXD, FILM: 10K OHM, 1% , 0 . 125W 
RES. , FXD,CMPSN: 10K OHM, 10% ,0 . 25W 
RES . , FXD,CMPSN : 24K OHM,5%,0.25W 
RES . ,FXD ,CMPSN : 5 . 6K OHM,5%,0.25W 
RES. .FXD.CMPSN: 220 OHM, 10% ,0 . 25W 
RES.,FXD,WW:0.33 OHM,5%,2W 

RE S . , FXD , CMPSN : 2 70K OHM, 10% , 0 . 25W 
RES. ,FXD,FILM:40K OHM.O. 1%,0. 125W 
RES . , FXD, FILM : 4K OHM.Oi 1%, 0. 125W 
RES . , FXD , CMPSN : 6 . 2K 0HM,5%,0.25W 
RES . , FXD.CMPSN : 27K OHM, 10% ,0 . 25W 
RES. , FXD, CMPSN: 4 7K OHM, 10% ,0 . 25W 

RES . , FXD , CMPSN : 330K OHM, 10% ,0 . 25W 
RES. , FXD, CMPSN: 10K OHM, 10% ,0 . 25W 
RES . , FXD, CMPSN: 470 OHM,5%,0.25W 
(7844 ONLY) 

RES . ,FXD ,CMPSN : 560 OHM,5%,0.25W 
(7844 ONLY) 

RES. ,FXD,CMPSN:470 OHM,5%,0.25W 
(R7844 ONLY) 

RES . ,FXD,CMPSN : 560 OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD ,CMPSN ; 5 . 6K OHM,5%,0.25W 
RES . , FXD , CMPSN : 22K OHM, 10%,0.25W 

RES . , FXD.CMPSN : 1 . 5K OHM,5%,0.25W 
RES. ,FXD,CMPSN: 75 OHM,5%,0.25W 
RES. .FXD.CMPSN: 1 OK OHM, 10% , 0 . 25W 
RES. , FXD.CMPSN: 680 OHM, 10% , 0. 25W 
RES. ,FXD,WW:0. 12 OHM,5%,2W 
RES. .FXD.CMPSN: 47 OHM , 10% ,0. 25W 

RES. ,FXD,CMPSN:47 OHM, 10% , 0 . 25W 
RES . .FXD.CMPSN : 6 . 8 0HM,10%,1W 
RES . , FXDjCMPSN: 56K OHM, 10% ,0 . 50W 
RES., FXD.CMPSN: 820 OHM, 10% , 0. 25W 
(7844 ONLY) 

RES., FXD.CMPSN: 820 0HM,5%,0.25W 
(7844 ONLY) 

RES . , FXD , CMPSH : 820 OHM , 1 0% , 0 . 2 5W 
(R7844 ONLY) 

RES., FXD.CMPSN: 820 OHM,5%,0.25W 
(R7844 ONLY) 

RES. .FXD.CMPSN: 3. 3K OHM,5%,0.25W 
(7844 ONLY) 

RES. .FXD.CMPSN: 1. IK OHM,5%,0.25W 
(7844 ONLY) 

RES. .FXD.CMPSN : 3. 3K OHM,5X,0.25W 
(R7844 ONLY) 

RES. , FXD.CMPSN: 1 . IK OHM,5X,0.25W 
(R7844 ONLY) 

RES., FXD.CMPSN: 15 OHM , 10% , 0. 25W 
(7844 ONLY) 



Mfr 

Code 


Mfr Part Number 


01121 


EB1235 


01121 


CB1015 


01121 


CB2221 


01121 


CB3311 


75042 


BWH-1R800J 


01121 


CB4711 


91637 


MFF1816G10001F 


01121 


CB1031 


01121 


CB2435 


01121 


CB5625 


01121 


CB2211 


75042 


BWH-R3300J 


01121 


CB2741 


91637 


MFF1816C40001B 


91637 


MFF1816C40000B 


01121 


CB6225 


01121 


CB2731 


01121 


CB4731 


01121 


CB3341 


01121 


CB1031 


01121 


CB4715 


01121 


CB5615 



01121 


CB4715 


01121 


CB5615 


01121 

01121 


CB5625 

CB2231 


01121 

01121 

01121 

01121 

75042 

01121 


CB1525 

CB7505 

CB1031 

CB6811 

BWH-R1 200J 

CB4701 


01121 

01121 

01121 

01121 


CB4701 

GB68G1 

EB5631 

CB8211 


01121 


CB8215 


01121 


CB8211 


01121 


CB8215 


01121 


CB3325 


01121 


CB1125 


01121 


CB3325 


01121 


CB1125 


01121 


CB1501 



REV OCT 1981 



8-75 




Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eff Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Number 


R1432 


316-0104-00 






RES . , FXD , CMPSN : 100K OHM, 10%, 0. 25W 


01121 


CB1041 


R1434 


316-0334-00 






RES . , FXD , CMPSN : 330K OHM , 10% ,0 . 25W 


01121 


CB3341 


R1436 


316-0103-00 






RES . , FXD , CMPSN : 10K OHM, 10% ,0 . 25W 


01121 


CB1031 


R1437 


316-0274-00 






RES. , FXD , CMPSN: 270K OHM, 10% , 0 . 25W 


01121 


CB2741 


R1440 


321-0924-07 






RES . , FXD , FILM:40K OHM,0 . 1% , 0 . 125W 


91637 


MFF1816C40001B 


R1441 


321-1296-07 






RES. , FXD, FILM: 12K OHM, 0 . 1% , 0 . 125W 


91637 


MFF1816C12001B 


R1443 


315-0511-00 






RES. , FXD, CMPSN : 510 OHM,5%,0.25W 


01121 


CB5115 


R1444 


315-0153-00 






RES. , FXD, CMPSN :15K OHM,5%,0.25W 


01121 


CB1535 


R1446 


316-0333-00 






RES. , FXD, CMPSN: 33K OHM, 10% , 0 . 25W 


01121 


CB3331 


R1448 


315-0332-00 






RES. , FXD, CMPSN: 3. 3K 0HM,5%,0.25W 


01121 


CB3325 


R1449 


315-0101-00 






RES. , FXD, CMPSN: 100 OHM,5%,0.25W 


01121 


CB1015 


R1451 


315-0103-00 


B010100 


B100644 


RES. , FXD, CMPSN :1 OK OHM, 55*0.2517 


01121 


CB1035 










(7844 ONLY) 






R1451 


302-0392-00 


B100645 




RES. , FXD, CMPSN: 3. 9K OHM, 10% ,0 . 50W 


01121 


EB3921 










(7844 ONLY) 






R1451 


315-0103-00 


B010100 


B090319 


RES., FXD, CMPSN: 10K OHM,5%,0.25W 


01121 


CB1035 










(R7844 ONLY) 






R1451 


302-0392-00 


B090320 




RES. , FXD, CMPSN: 3. 9K OHM, 10% , 0 . 50W 


01121 


EB3921 










(R7844 ONLY) 






R1453 


316-0153-00 






RES. , FXD, CMPSN :15K OHM, 10% ,0. 25W 


01121 


CB1531 


R1456 


316-0681-00 






RES. , FXD, CMPSN: 680 OHM, 10% ,0 . 25W 


01121 


CB6811 


R1457 


308-0643-00 






RES. ,FXD,WW:0.1 OHM,3%.3W 


91637 


RS2B-ER1000H 


R1459 


316-0151-00 






RES., FXD, CMPSN: 150 OHM , 10% ,0. 25W 


01121 


CB1511 


R1461 


316-0182-00 






RES ., FXD , CMPSN : 1 . 8K OHM, 10% ,0 . 25W 


01121 


CB1821 


R1463 


321-1296-07 






RES. , FXD, FILM: 12K OHM,0 . 1% ,0 . 125W 


91637 


MFF1816C12001B 


R1464 


321-0332-07 






RES. ,FXD,FILM:28K OHM,0 . 1% ,0 . 125W 


91637 


MFF1816C28001B 


R1467 


316-0184-00 






RES. , FXD, CMPSN: 180K OHM, 10% , 0 . 25W 


01121 


CB1841 


R1480 


316-0124-00 






RES. , FXD, CMPSN: 120K OHM, 10% ,0 . 25W 


01121 


CB1241 


R1481 


316-0471-00 






RES. , FXD, CMPSN: 470 OHM, 10% ,0 . 25W 


01121 


CB4711 


R1485 


316-0272-00 






RES. , FXD, CMPSN: 2. 7K OHM, 10% , 0 . 25W 


01121 


CB2721 


R1487 


316-0222-00 






RES. , FXD, CMPSN: 2. 2K OHM, 10% ,0 . 25W 


01121 


CB2221 


R1490 


302-0822-00 






RES. , FXD, CMPSN: 8. 2K OHM, 10%, 0. 50W 


01121 


EB8221 


R1492 


316-0273-00 






RES. , FXD , CMPSN : 27K OHM, 10% , 0. 25W 


01121 


CB2731 


R1493 


315-0391-00 






RES. , FXD, CMPSN: 390 OHM,5%,0.25W 


01121 


CB3915 


R1495 


316-0222-00 






RES. , FXD, CMPSN: 2. 2K OHM, 10% ,0 . 25W 


01121 


CB2221 


R1497 


316-0681-00 






RES. , FXD, CMPSN: 680 OHM, 10% ,0 . 25W 


01121 


CB6811 


R1498 


308-0643-00 






RES. ,FXD,WW:0.1 OHM,3%,3W 


91637 


RS2B-ER1000H 


R1499 


316-0471-00 






RES. , FXD, CMPSN: 470 OHM, 10% ,0 . 25W 


01121 


CB4711 


R1502 


316-0393-00 






RES. , FXD, CMPSN :39K OHM, 10% ,0 . 25W 


01121 


CB3931 


R1504 


323-0264-00 






RES . , FXD .FILM: 5 . 49K OHM,1%,0.50W 


91637 


MFF1226G54900F 


R1506 


315-0562-00 






RES., FXD, CMPSN: 5. 6K 0HM,5%,0.25W 


01121 


CB5625 


R1509 


316-0224-00 






RES . , FXD .CMPSN : 220K OHM, 10% ,0 . 25W 


01121 


CB2241 


R1512 


321-0272-00 






RES. , FXD.FILM: 6 . 65K OHM, 1% , 0 . 125W 


91637 


MFF1816G66500F 


R1513 


311-0635-00 






RES . , VAR , NONWIR : IK OHM, 10% , 0 . 50W 


73138 


82-32-0 


R1514 


321-0338-00 






RES . , FXD.FILM: 32 .4K OHM, 1%,0. 125W 


91637 


MFF1816G32401F 


R1517 


316-0125-00 






RES. , FXD, CMPSN : 1 . 2M OHM, 10%, 0. 25W 


01121 


CB1251 


R1518 


315-0471-00 


B010100 


B141744 


RES. ,FXD,CMPSN:470 OHM,5%,0.25W 


01121 


CB4715 










(7844 ONLY) 






R1518 


315-0202-00 


B141745 




RES. , FXD, CMPSN :2K 0HM,5Z,0.25W 


01 121 


CB2025 










(7844 ONLY) 






R1518 


315-0471-00 


B010100 


B140834 


RES. , FXD, CMPSN: 470 OHM,5%,0.25W 


01121 


CB4715 










( R7844 ONLY) 






R1518 


315-0202-00 


B140835 




RES. , FXD, CMPSN :2K OHM,5%,0.25W 


01121 


CB2025 










(R7844 ONLY) 






R1522 


316-0472-00 






RES. , FXD, CMPSN: 4. 7K OHM, 10% ,0 . 25W 


01121 


CB4721 


R1524 


316-0102-00 






RES. , FXD, CMPSN: IK OHM, 1 0% ,0 . 25W 


01121 


CB1021 


R1528 


316-0123-00 






RES. , FXD, CMPSN: 12K OHM, 1 0% , 0 . 25W 


01121 


CB1231 



8-74 



REV OCT 1981 




Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No 


Tektronix 
Part No. 


Serial/Model No. 

Eft Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Number 


R1685 


317-0910-00 






RES . , FXD , CMPSN : 9 1 OHM, 5% ,0 . 125W 


01121 


BB9105 


R1686 


317-0910-00 






RES . , FXD , CMPSN : 9 1 OHM, 52 , 0 . 125W 


01121 


BB9105 


R1687 


317-0131-00 






RES. , FXD, CMPSN: 130 OHM,5%,0. 125W 


01121 


BB1315 


R1689 


323-0121-00 






RES . , FXD .FILM: 178 011M,12,0.50W 


75042 


CECTO-1 780F 


R1690 


321-0147-00 






RES . , FXD, FILM: 332 OHM, 1%,0. 125W 


91637 


MFF1816G332ROF 


R1692 


315-0102-00 






RES. , FXD, CMPSN: IK OHM,5%,0.25W 


01121 


CB1025 


R1694 


321-0155-00 






RES. , FXD, FILM: 402 OHM, 1% ,0. 125W 


91637 


MFF1816G402R0F 


R1696 


321-0237-00 


B010100 


B010129 


RES . , FXD, FILM : 2 . 87K OHM, 12 , 0 . 125W 


91637 


MFF1816G28700F 










(7844 ONLY) 






R1696 


321-0232-00 


B010130 




RES . , FXD , FILM: 2 . 55K OHM , 1 % , 0 . 1 2 5W 


91637 


MFF1816G25500F 










(7844 ONLY) 






R1696 


321-0237-00 


B010100 


B010112 


RES . , FXD , FILM: 2 . 87K OHM, 1%,0. 125W 


91637 


MFF1816G28700F 










(R7844 ONLY) 






R1696 


321-0232-00 


B010113 




RES . , FXD .FILM: 2 . 55K OHM, 17. , 0 . 1 25W 


91637 


MFF1816G25500F 










( R7844 ONLY) 






R1700 


311-1563-00 






RES. , VAR, NONWIR: IK OHM, 20% ,0 . 50W 


73138 


91-85-0 


R1702 


315-0(21-00 






RES. , FXD, CMPSN: 620 OHM, 5% , 0. 25W 


01121 


CB6215 


R1710 


315-0182-00 






RES. ,FXD, CMPSN: 1 . 8K OHM, 5%, 0 . 25W 


01121 


CB1825 


R1712 


315-0820-00 






RES. , FXD, CMPSN: 82 OHM,5%,0.25W 


01121 


CB8205 


R1714 


311-1567-00 






RES . , VAR, NONWIR:TRMR, 1 00 OHM.0.50W 


73138 


91-89-0 


R1716 


311-1594-00 






RES . , VAR, NONWIR : 10 OHM, 202,0. 50W 


73138 


91-93-0 


R1718 


315-0100-00 






RES . , FXD , CMPSN : 10 OHM,52,0.25W 


01121 


CB1005 


R1720 


321-0079-00 






RES. , FXD, FILM: 64. 9 OHM, 1% , 0. 125W 


91637 


MFF1816G64R90F 


R1722 


321-0089-00 






RES . , FXD , F ILM: 82 . 5 OHM, 12,0. 125W 


91637 


MFF1816G82R50F 


R1724 


321-0089-00 






RES. , FXD .FILM: 82 . 5 OHM, 12 , 0 . 125W 


91637 


MFF1816G82R50F 


R1726 


308-0736-00 






RES. , FXD, WW: 200 OHM,12,3W 


91637 


RS2B-B200R0F 


R1730 


311-1260-00 






RES. , VAR, NONWIR: 250 OHM , 10% , 0 . SOW 


32997 


3329P-L58-251 


R1732 


317-0300-00 






RES. , FXD, CMPSN: 30 OHM, 5% ,0. 125W 


01121 


BB3005 


R1733 


317-0047-00 






RES. , FXD, CMPSN: 4. 7 OHM, 52,0. 125W 


01121 


BB47G5 


R1734 


317-0101-00 






RES., FXD, CMPSN: 100 OHM, 52 ,0 . 125W 


01121 


BB1015 


R1735 


323-0069-00 






RES . , FXD .FILM : 51 . 1 OHM, 12,0. 50W 


91637 


MFF 1 226G51 R10F 


R1736 


317-0101-00 


8010100 


B142329 


RES . , FXD, CMPSN : 100 OHM, 52,0. 125W 


01121 


BB1015 










(NOMINAL VALUE, SELECTED 7844 ONLY) 






R1736 


317-0910-00 


B142330 




RES . , FXD, CMPSN : 91 OHM, 5% , 0 . 1 25W 


01121 


BB9105 




— 






(NOMINAL VALUE, SELECTED 7844 ONLY) 






R1736 


317-0101-00 


B010100 


B 14 1 1 1 9 


RES. , FXD, CMPSN: 100 OHM, 52,0. 125W 


01121 


BB101 5 










(NOMINAL VALUE, SELECTED R7844 ONLY) 






R1736 


317-0910-00 


B141120 




RES. , FXD, CMPSN: 91 OHM , 5% , 0 . 1 25W 


01121 


BB9105 










(NOMINAL VALUE .SELECTED R7844 ONLY) 






R1737 


323-0069-00 






RES . , FXD, FILM : 51 . 1 OHM, 1%,0. 50W 


91637 


MFF1226G5 1 R1 OF 


R1738 


317-0101-00 






RES. , FXD, CMPSN: 100 OHM, 52 ,0. 125W 


01121 


BB1015 


R1739 


317-0047-00 






RES . , FXD, CMPSN: 4. 7 OHM, 52 , 0 . 125W 


01121 


BB47G5 


R1741 


317-0161-00 






RES. , FXD, CMPSN: 160 OHM, 52,0. 125W 


01121 


BB1615 










(NOMINAL VALUE, SELECTED) 






R1743 


311-1261-00 






RES . , VAR , NONWIR : 500 OHM, 102 , 0 . 50W 


32997 


3329P-L58-501 


R1745 


317-0561-00 


B010100 


B010140 


RES. , FXD, CMPSN: 560 OHM , 52 , 0 . 125W 


01121 


BB5615 










(7844 ONLY) 














(NOMINAL VALUE, SELECTED) 






R1745 


317-0431-00 


BO 10 141 




RES. .FXD, CMPSN: 430 OHM, 52,0. 125W 


01121 


BB4315 










(7844 ONLY) 














(NOMINAL VALUE, SELECTED) 






R1745 


317-0561-00 


B010100 


B010112 


RES. , FXD, CMPSN: 560 OHM, 52 , 0 . 125W 


01121 


BB5615 










(R7844 ONLY) 














(NOMINAL VALUE, SELECTED) 






R1745 


317-0431-00 


B010113 




RES ., FXD , CMPSN : 430 OHM , 52 , 0 . 1 2 5W 


01121 


BB4315 



(R7844 ONLY) 

(NOMINAL VALUE .SELECTED) 



REV OCT 1981 



8-77 




Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 



Tektronix Serial/Model No 
Part No. Eff Dscont 



Name & Description 



Mfr 

Code Mfr Part Number 



R1631 


315-0150-00 


B142470 




RES . ,FXD,CMPSN : 15 OHM, 57. ,0. 25W 


01121 


CB1505 










(7844 ONLY) 






R1631 


316-0150-00 


B010100 


B141189 


RES. ,FXD,CMPSN: 15 OHM, 10% ,0. 25W 


01121 


CB1501 










(R7844 ONLY) 






R1631 


315-0150-00 


B141190 




RES. ,FXD,CMPSN: 15 OHM, 5% , 0 . 25W 


01121 


CB1505 










(R7844 ONLY) 






R1632 


316-0681-00 


B010100 


B142469 


RES . , FXD ,CMPSN : 680 OHM, 10%,0.25W 


01121 


CB6811 










(7844 ONLY) 






R1632 


315-0681-00 


B142470 




RES. ,FXD,CMPSN:680 OHM,5%,0.25W 


01121 


CB6815 










(7844 ONLY) 






R1632 


316-0681-00 


B010100 


B141189 


RES. ,FXD,CMPSN:680 OHM, 10% , 0. 25W 


01121 


CB6811 










(R7844 ONLY) 






R1632 


315-0681-00 


B141190 




RES . ,FXD,CMPSN: 680 OHM,5%,0.25W 


01121 


CB6815 










(R7844 ONLY) 






R1633 


316-0331-00 


B010100 


B142469 


RES . , FXD,CMPSN : 330 OHM, 10% , 0 . 25W 


01121 


CB3311 










(7844 ONLY) 






R1633 


315-0331-00 


B142470 




RES . , FXD , CMPSN : 330 OHM,5%,0.25W 


01121 


CB3315 










(7844 ONLY) 






R1633 


316-0331-00 


B010100 


B141189 


RES. , FXD, CMPSN: 330 OHM, 10% ,0. 25W 


01121 


CB3311 










(R7844 ONLY) 






R1633 


315-0331-00 


B141190 




RES. , FXD, CMPSN: 330 OHM,5%,0.25W 


01121 


CB3315 










(R7844 ONLY) 






R1634 


316-0392-00 


B010100 


B142469 


RES. , FXD, CMPSN: 3. 9K OHM, 10% ,0 . 25W 


01121 


CB3921 










(7844 ONLY) 






R1634 


315-0392-00 


B142470 




RES. , FXD, CMPSN: 3. 9K OHM,5%,0.25W 


01121 


CB3925 










(7844 ONLY) 






R1634 


316-0392-00 


B010100 


B141189 


RES. , FXD, CMPSN: 3. 9K OHM, 10% ,0 . 25W 


01121 


CB3921 










(R7844 ONLY) 






R1634 


315-0392-00 


B141190 




RES. , FXD, CMPSN: 3. 9K 0HM,5%,0.25W 


01121 


CB3925 










(R7844 ONLY) 






R1635 


315-0244-00 






RES. , FXD, CMPSN : 240K OHM,5%,0.25W 


01121 


CB2445 


R1637 


316-0474-00 


B010100 


B142469 


RES., FXD, CMPSN :470K OHM, 10% ,0 . 25W 


01121 


CB4741 










(7844 ONLY) 






R1637 


315-0474-00 


B142470 




RES. ,FXD,CMPSN:470K OHM,5%,0.25W 


01121 


CB4745 










(7844 ONLY) 






R1637 


316-0474-00 


B010100 


B141189 


RES. , FXD, CMPSN :470K OHM, 10% , 0. 25W 


01121 


CB4741 










(R7844 ONLY) 






R1637 


315-0474-00 


B141190 




RES. , FXD, CMPSN :470K 0HM,5%,0.25W 


01121 


CB4745 










( R7844 ONLY) 






R1656 


323-0105-00 






RES. , FXD .FILM: 121 OHM,1%,0.50W 


75042 


CECTO-12 10F 


R1657 


317-0270-00 






RES . , FXD , CMPSN : 27 OHM, 5% ,0 . 125W 


01121 


BB2705 


R1658 


311-0605-00 






RES . , VAR, NONWIR : TRMR, 200 OHM.0.5W 


73138 


82-23-2 


R1659 


317-0270-00 






RES . , FXD, CMPSN : 27 OHM, 5% ,0 . 125W 


01121 


BB2705 


R1660 


321-0114-00 






RES., FXD, FILM: 150 OHM, 1% , 0 . 125W 


91637 


MFF1816G150ROF 


R1661 


321-0114-00 






RES. , FXD, FILM: 150 OHM, 1% ,0 . 125W 


91637 


MFF1816G150R0F 


R1662 


321-0039-00 






RES. , FXD, FILM: 24.9 OHM, 1%,0. 125W 


91637 


MFF 181 6G24R90F 


R1663 


321-0039-00 






RES . , FXD, FILM: 24 . 9 OHM , 1% ,0 . 125W 


91637 


MFF1816G24R90F 


R1667 


315-0561-00 






RES. , FXD .CMPSN: 560 OHM,5%,0.25W 


01121 


CB5615 


R1668 


315-0561-00 






RES. , FXD, CMPSN: 560 OHM,5%,0.25W 


01121 


CB5615 


R1670 


317-0047-00 






RES. , FXD .CMPSN: 4. 7 OHM,5%,0. 125W 


01121 


BB47G5 


R1672 


317-0047-00 






RES . , FXD , CMPSN : 4 . 7 OHM, 5% ,0 . 125W 


01121 


BB47G5 


R1676 


317-0101-00 






RES. , FXD, CMPSN: 100 OHM, 5% , 0 . 125W 


01121 


BB1015 


R1677 


323-0069-00 






RES . , FXD .FILM: 51.1 OHM,1%,0.50W 


91637 


MFF1226G51 R1 OF 


R1679 


323-0069-00 






RES . , FXD .FILM: 51 . 1 OHM,1%,0.50W 


91637 


MFF1226G51R10F 


R1680 


317-0101-00 






RES. , FXD, CMPSN: 100 OHM , 5% , 0 . 1 25W 


01121 


BB1015 


R1682 


323-0121-00 






RES. , FXD, FILM: 178 OHM,1%,0.50W 


75042 


CECTO-l 780F 


R1683 


317-0131-00 






RES., FXD, CMPSN: 130 OHM, 5% ,0. 125W 


01121 


BB1315 



8-76 



REV OCT 1981 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/ Model No. 



Ckt No. 


Part No. 


Eff 


Dscont 


R1810 


321-0207-00 


B010100 


B109999X 


R1811 


321-0253-00 


B010100 


B099999X 


R1811 


321-0253-00 


B010100 


B109999X 


R1812 


321-0074-00 


B010100 


B099999X 


R1812 


321-0074-00 


B010100 


B109999X 


R1814 


321-0071-00 


B010100 


B099999X 


R1814 


321-0071-00 


B010100 


B109999X 


R1815 


321-0132-00 


B010100 


B099999X 


R1815 


321-0132-00 


B010100 


B109999X 


R1816 


311-1261-00 


B010100 


B099999X 


R1816 


311-1261-00 


B010100 


B109999X 


R1817 


315-0112-00 


B010100 


B099999X 


R1817 


315-0112-00 


B010100 


B109999X 


R1818 


321-0081-00 


B010100 


B099999X 


R1818 


321-0081-00 


B010100 


B109999X 


R1819 


321-0081-00 


B010100 


B099999X 


R1819 


321-0081-00 


B010100 


B109999X 


R1820 


315-0271-00 


B010100 


B099999X 


R1820 


315-0271-00 


B010100 


B109999X 


R1822 


315-0271-00 


B010100 


B099999X 


R1822 


315-0271-00 


B010100 


B109999X 


R1824 


321-0228-00 


B010100 


B099999X 


R1824 


321-0228-00 


B010100 


B109999X 


R1825 


321-0295-00 


B010100 


B099999X 


R1825 


321-0295-00 


B010100 


B109999X 


R1826 


315-0682-00 


B010100 


B099999X 


R1826 


315-0682-00 


B010100 


B109999X 


R1828 


322-0161-00 


B010100 


B099999X 


R1828 


322-0161-00 


B010100 


B109999X 



Name & Description 



RES. ,FXD,FILM: 1 .4K OHM, 1% ,0 . 125W 
(7844 ONLY) 

RES. ,FXD,FILM:4.22K OHM, 1% ,0. 125W 
(R7844 ONLY) 

RES . , FXD ,FILM: 4 . 22K OHM, 1Z,0. 125W 
(7844 ONLY) 

RES . ,FXD ,FILM: 57.6 OHM, 1%,0. 125W 
(R7844 ONLY) 

RES . , FXD, FILM: 57 . 6 OHM, 1% , 0. 125W 
(7844 ONLY) 

RES. , FXD, FILM: 53 . 6 OHM, 1%,0. 125W 
(R7844 ONLY) 

RES . ,FXD ,FILM: 53 . 6 0HM,U,0.125W 
(7844 ONLY) 

RES., FXD, FILM: 232 OHM, 1% , 0 . 125W 
(R7844 ONLY) 

RES., FXD, FILM: 232 OHM, 1%,0. 125W 
(7844 ONLY) 

RES . , VAR, NONWIR: 500 OHM, 10% , 0 . 50W 
(R7844 ONLY) 

RES. , VAR, NONWIR: 500 OHM, 10% ,0 . 50W 
(7844 ONLY) 

RES. ,FXD,CMPSN: 1 . IK OHM,5%,0.25W 
(R7844 ONLY) 

RES. ,FXD,CMPSN: 1 . IK OHM,5%,0.25W 
(7844 ONLY) 

RES . , FXD, FILM: 68 . 1 OHM, 1% , 0. 125W 
(R7844 ONLY) 

RES. , FXD, FILM: 68. 1 OHM, 1%,0. 125W 
(7844 ONLY) 

RES . , FXD .FILM: 68.1 OHM, 1% ,0 . 125W 
(R7844 ONLY) 

RES., FXD, FILM: 68.1 OHM, 1%,0. 125W 
(7844 ONLY) 

RES. ,FXD,CMPSN:270 0HM,5%,0.25W 
( R7844 ONLY) 

RES . , FXD .CMPSN : 2 70 OHM,5%,0.25W 
(7844 ONLY) 

RES. ,FXD,CMPSN: 270 OHM,5%,0.25W 
(R7844 ONLY) 

RES. ,FXD , CMPSN: 270 OHM,5%,0.25W 
(7844 ONLY) 

RES . , FXD , FILM : 2 . 32K OHM, 1% , 0 . 125W 
(R7844 ONLY) 

RES . , FXD, FILM : 2 . 32K OHM, 1%,0. 125W 
(7844 ONLY) 

RES. , FXD, FILM: 11 . 5K OHM, 1% , 0 . 125W 
(R7844 ONLY) 

RES . , FXD, FILM: 1 1 . 5K OHM, 1%,0. 125W 
(7844 ONLY) 

RES. , FXD, CMPSN: 6. 8K OHM,5%,0.25W 
(R7844 ONLY) 

RES., FXD, CMPSN: 6. 8K OHM,5%,0.25W 
(7844 ONLY) 

RES . ,FXD ,FILM; 464 0HM,1%,0.25W 
(R7844 ONLY) 

RES. ,FXD,FILM:464 0HM,1%,0.25W 
(7844 ONLY) 



Mfr 

Code Mfr Part Number 



91637 


MFF1816G14000F 


91637 


MFF1816G42200F 


91637 


MFF1816G42200F 


91637 


MFF1816G57R60F 


91637 


MFF1816G57R60F 


91637 


MFF1816G53R60F 


91637 


MFF1816G53R60F 


91637 


MFF1816G232R0F 


91637 


MFF1816G232R0F 


32997 


3329P-L58-501 


32997 


3329P-L58-501 


01121 


CB1125 


01121 


CB1125 


91637 


MFF1816G68R10F 


91637 


MFF1816G68R10F 


91637 


MFF1816G68R10F 


91637 


MFF1816G68R10F 


01121 


CB2715 


01121 


CB2715 


01121 


CB2715 


01121 


CB2715 


91637 


MFF1816G23200F 


91637 


MFF1816G23200F 


91637 


MFF1816G11501F 


91637 


MFF1816G11501F 


01121 


CB6825 


01121 


CB6825 


75042 


CEBT0-4640F 


75042 


CEBT0-4640F 



REV OCT 1981 



8-79 



Replaceable Electrical Parts — 7844/FI7844 Service 



Tektronix Serial/Model No. Mfr 

Ckt No. Part No. Eff Dscont Name & Description Code Mfr Part Number 



R1747 


317-0471-00 


B010100 


B142329 


RES . , FXD , CMPSN: 470 OHM , 5% , 0 . 125W 


01121 


BB4715 










(NOMINAL VALUE, SELECTED 7844 ONLY) 






R1747 


317-0391-00 


B142330 




RES. , FXD, CMPSN: 390 OHM,5Z,0 . 125W 


01121 


BB3915 










(NOMINAL VALUE , SELECTED 7844 ONLY) 






R1747 


317-0471-00 


B010100 


B 1 4 1 1 1 9 


RES. , FXD, CMPSN: 470 OHM , 5%,0. 125W 


01121 


BB4715 










(NOMINAL VALUE , SELECTED R7844 ONLY) 






R1747 


317-0391-00 


B141120 




RES. , FXD, CMPSN: 390 0HM,5%,0. 125W 


01121 


BB3915 










(NOMINAL VALUE, SELECTED R7844 ONLY) 






R1749 


311-0635-00 






RES. ,VAR,N0NWIR: IK OHM , 10% ,0 . 50W 


73138 


82-32-0 


R1753 


323-0097-00 






RES., FXD, FILM: 100 OHM,1%,0.50W 


75042 


CECT0-1000F 


R1754 


323-0097-00 






RES., FXD, FILM: 100 OHM,1%,0.50W 


75042 


CECT0-1000F 


R1756 


317-0161-00 






RES. , FXD, CMPSN: 160 OHM , 5% , 0 . 125W 


01121 


BB1615 


R1758 


311-1564-00 






RES . , VAR, NONWIR: TRMR, 500 OHM.0.5W 


73138 


91-86-0 


R1760 


317-0751-00 






RES. , FXD, CMPSN: 750 OHM , 5% , 0 . 125W 


01121 


BB7515 


R1762 


317-0471-00 






RES . ,FXD ,CMPSN:470 OHM , 5% , 0. 125W 


01121 


BB4715 


R1764 


311-1562-00 






RES., VAR, NONWIR: 2K OHM , 20% , 0 . 50W 


73138 


91-84-0 


R1767 


323-0097-00 






RES., FXD, FILM: 100 OHM,1%,0.50W 


75042 


CECTO-l OOOF 


R1768 


323-0097-00 






RES. , FXD, FILM: 100 OHM,1%,0.50W 


75042 


CECT0-1000F 


R1770 


308-0692-00 






RES. ,FXD,WW:44 0HM,1%,3W 


91637 


RS2B44R00F 


R1771 


323-0122-00 






RES. , FXD, FILM: 182 OHM,1%,0.50W 


75042 


CECT0-1820F 


R1782A, 


,B 307-0292-16 






RES. , FXD, FILM: 182.5 OHM W/PEAKING COIL 


80009 


307-0292-16 


R1783 


321-0324-00 


XB040000 




RES . , FXD, FILM: 23 . 2K OHM, 1% ,0 . 125W 


91637 


MFF1816G23201F 










(7844 ONLY) 






R1783 


321-0324-00 


XB030000 




RES . , FXD .FILM: 23 . 2K OHM, 1%,0. 125W 


91637 


MFF1816G23201F 



(R7844 ONLY) 

RES. ,FXD, FILM: 10K OHM, 1% ,0 . 125W 91637 MFF1816G10001F 

(7844 ONLY) 

RES., FXD, FILM: 10K OHM, 1%,0. 125W 91637 MFF1816G10001F 

(R7844 ONLY) 

RES . , FXD , CMPSN : 4. 7K 0HM,5%,0.25W 01121 CB4725 

(7844 ONLY) 

RES. , FXD, CMPSN: 4. 7K OHM,5%,0.25W 01121 CB4725 

(R7844 ONLY) 

RES. , FXD, CMPSN: 3. 6K OHM,5%,0.25W 01121 CB3625 

(7844 ONLY) 

RES. , FXD, CMPSN: 3. 6K OHM,5%,0.25W 01121 CB3625 

( R7844 ONLY) 



R1788 


315-0103-00 


XB020000 


B039999X 


RES. 


, FXD, CMPSN: 10K OHM,5%,0.25W 


01121 


CB1035 










(7844 ONLY) 






R1788 


315-0103-00 


XB020200 


B029999X 


RES. 


, FXD, CMPSN : 10K OHM,5%,0.25W 


01121 


CB1035 










(R7844 ONLY) 






R1790 


323-0064-00 






RES. 


, FXD .FILM: 45 . 3 OHM,1%,0.50W 


91637 


MFF1226G45R30F 


R1792 


323-0064-00 






RES. 


,FXD,FILM:45.3 OHM,1%,0.50W 


91637 


MFF1226G45R30F 


R1795 


323-0077-00 






RES. 


, FXD, FILM: 61 .9 OHM,1%,0.50W 


75042 


CECT0-61R90F 


R1796 


323-0145-00 






RES. 


, FXD, FILM: 316 OHM,1%,0.50W 


91637 


MFF1226G316R0F 


R1797 


321-0063-00 






RES. 


, FXD, FILM: 44. 2 OHM , 1% ,0. 125W 


91637 


MFF1816G44R20F 


R1799 


308-0248-00 






RES. 


, FXD,WW: 150 OHM , 1 % , 5W 


91637 


RS2A-B1 50R0F 


R1802 


322-0167-00 


B010100 


B099999X 


RES. 


, FXD .FILM: 536 OHM,1%,0.25W 


91637 


MFF1421G536R0F 



( R7844 ONLY) 



B010100 B109999X RES ., FXD, FILM : 536 OHM, 1% , 0 . 25W 91637 MFF1421G536R0F 

(7844 ONLY) 

B010100 B099999X RES. ,FXD,FILM:649 OHM, 1% ,0 . 25W 75042 CEBT0-6490F 

(R7844 ONLY) 

B010100 B109999X RES ., FXD , FILM: 649 OHM,1Z,0.25W 75042 CEBT0-6490F 

(7844 ONLY) 

R1810 321-0207-00 B010100 B099999X RES . ,FXD, FILM: 1 ,4K OHM , 1Z,0. 125W 91637 MFF1816G14000F 

(R7844 ONLY) 



R1802 322-0167-00 



R1806 322-0175-00 



R1806 322-0175-00 



R1784 


321-0289-00 


XB040000 


R1784 


321-0289-00 


XB030000 


R1785 


315-0472-00 


XB040000 


R1785 


315-0472-00 


XB030000 


R1786 


315-0362-00 


XB040000 


R1786 


315-0362-00 


XB030000 



8-78 



REV OCT 1981 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eff 


Dscont 


R1829 


321-0248-00 


B010100 


B099999X 


R1829 


321-0248-00 


B010100 


B109999X 


R1830 


321-0202-00 


B010100 


B099999X 


R1830 


321-0202-00 


B010100 


B109999X 


R1831 


315-0470-00 


XB030190 


B109999X 


R1831 


315-0470-00 


XB020123 


B099999X 


R1832 


322-0216-00 


B010100 


B099999X 


R1832 


322-0216-00 


B010100 


B109999X 


R1834 


321-0176-00 


B010100 


B099999X 


R1834 


321-0176-00 


B010100 


B109999X 


R1836 


321-0176-00 


8010100 


B099999X 


R1836 


321-0176-00 


B010100 


B109999X 


R1837 


321-0235-00 


B010100 


B099999X 


R1837 


321-0235-00 


B010100 


B109999X 


R1838 


311-1261-00 


B010100 


B099999X 


R1838 


311-1261-00 


B010100 


B109999X 


R1839 


321-0235-00 


B010100 


B099999X 


R1839 


321-0235-00 


B010100 


B109999X 


R1840 


315-0153-00 


B010100 


B099999X 


R1840 


315-0153-00 


B010100 


B109999X 


R1842 


315-0751-00 


B010100 


B099999X 


R1842 


315-0751-00 


B010100 


B109999X 


R1844 


321-0204-00 


B010100 


B099999X 


R1844 


321-0204-00 


B010100 


B109999X 


R1845 


315-0362-00 


B010100 


B099999X 


R1845 


315-0362-00 


B010100 


B109999X 


R1846 


308-0647-00 


B010100 


B099999X 


R1846 


308-0647-00 


B010100 


B109999X 



Name & Description 



RES. , FXD , FILM: 3 . 74K OHM, 1% ,0 . 125W 
(R7844 ONLY) 

RES . ,FXD,FILM: 3 . 74K OHM, 1%,0. 125W 
(7844 ONLY) 

RES. , FXD, FILM: 1.24K OHM, 1% , 0 . 125W 
( R7844 ONLY) 

RES. , FXD, FILM: 1 .24K OHM, 1%,0. 125W 
(7844 ONLY) 

RES . , FXD ,CMPSN : 47 OHM,5%,0.25W 
(7844 ONLY) 

RES . , FXD ,CMPSN :47 OHM,5%,0.25W 
( R7844 ONLY) 

RES. , FXD, FILM: 1.74K OHM,1%,0.25W 
(R7844 ONLY) 

RES., FXD, FILM: 1.74K OHM,1%,0.25W 
(7844 ONLY) 

RES. , FXD, FILM: 665 OHM, 1% , 0 . 125W 
(R7844 ONLY) 

RES. ,FXD,FILM:665 OHM, 1% , 0 . 125W 
(7844 ONLY) 

RES . ,FXD , FILM: 665 OHM, 1% ,0 . 125W 
(R7844 ONLY) 

RES . ,FXD , FILM: 665 OHM, 1% ,0 . 125W 
(7844 ONLY) 

RES. ,FXD,FILM:2.74K OHM, 1%,0. 125W 
(R7844 ONLY) 

RES. , FXD, FILM: 2. 74K OHM, 1%,0. 125W 
(7844 ONLY) 

RES . , VAR, NONWIR: 500 OHM , 10% , 0 . 50W 
(R7844 ONLY) 

RES. , VAR, NONWIR: 500 OHM , 10% ,0 . 50W 
(7844 ONLY) 

RES . , FXD .FILM: 2 . 74K OHM,1%,0. 125W 
(R7844 ONLY) 

RES., FXD, FILM: 2. 74K OHM , 1% ,0 . 125W 
(7844 ONLY) 

RES . , FXD , CMPSN : 15K OHM,5%,0.25W 
( R7844 ONLY) 

RES. , FXD, CMPSN: 15K OHM,5%,0.25W 
(7844 ONLY) 

RES., FXD, CMPSN: 750 OHM,5%,0.25W 
( R7844 ONLY) 

RES. , FXD, CMPSN: 750 OHM,5%,0.25W 
(7844 ONLY) 

RES., FXD, FILM: 1.3K OHM, 1%,0. 125W 
( R7844 ONLY) 

RES. , FXD, FILM: 1.3K OHM, 1% , 0 . 125W 
(7844 ONLY) 

RES. , FXD, CMPSN: 3. 6K OHM,5%,0.25W 
(R7844 ONLY) 

RES., FXD, CMPSN: 3. 6K 0HM,5%,0.25W 
(7844 ONLY) 

RES. ,FXD,WW:2.7K 0HM,1%,3W 
(R7844 ONLY) 

RES. ,FXD,WW:2.7K 0HM,1%,3W 
(7844 ONLY) 



Mfr 

Code Mfr Part Number 



91637 


MFF1816G37400F 


91637 


MFF1816G37400F 


91637 


MFF1816G12400F 


91637 


MFF1816G12400F 


01121 


CB4705 


01121 


CB4705 


75042 


CEBT0-1741F 


75042 


CEBT0-1741F 


91637 


MFF1816G665R0F 


91637 


MFF1816G665R0F 


91637 


MFF1816G665R0F 


91637 


MFF1816G665R0F 


91637 


MFF1816G27400F 


91637 


MFF1816G27400F 


32997 


3329P-L58-501 


32997 


3329P-L58-501 


91637 


MFF1816G27400F 


91637 


MFF1816G27400F 


01121 


CB1535 


01121 


CB1535 


01121 


CB7515 


01121 


CB7515 


91637 


MFF1816G13000F 


91637 


MFF1816G13000F 


01121 


CB3625 


01121 


CB3625 


91637 


NS2B-66-27000F 


91637 


NS2B-66-27000F 



8-80 



REV OCT 1981 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eft 


Dscont 


R1829 


321-0248-00 


B010100 


B099999X 


R1829 


321-0248-00 


B010100 


B109999X 


R1830 


321-0202-00 


B010100 


B099999X 


R1830 


321-0202-00 


B010100 


B109999X 


R1831 


315-0470-00 


XB0301 90 


B109999X 


R1831 


315-0470-00 


XB020123 


B099999X 


R1832 


322-0216-00 


B010100 


B099999X 


R1832 


322-0216-00 


B010100 


B109999X 


R1834 


321-0176-00 


B010100 


B099999X 


R1834 


321-0176-00 


B010100 


B109999X 


R1836 


321-0176-00 


B010100 


B099999X 


R1836 


321-0176-00 


B010100 


B109999X 


R1837 


321-0235-00 


B010100 


B099999X 


R1837 


321-0235-00 


B010100 


B109999X 


R1838 


311-1261-00 


B010100 


B099999X 


R1838 


311-1261-00 


B010100 


B109999X 


R1839 


321-0235-00 


B010100 


B099999X 


R1839 


321-0235-00 


B010100 


B109999X 


R1840 


315-0153-00 


B010100 


B099999X 


R1840 


315-0153-00 


B010100 


B109999X 


R1842 


315-0751-00 


B010100 


B099999X 


R1842 


315-0751-00 


B010100 


B109999X 


R1844 


321-0204-00 


B010100 


B099999X 


R1844 


321-0204-00 


B010100 


B109999X 


R1845 


315-0362-00 


B010100 


B099999X 


R1845 


315-0362-00 


BO 10100 


B109999X 


R1846 


308-0647-00 


B010100 


B099999X 


R1846 


308-0647-00 


B010I00 


B109999X 



Name & Description 



RES . , FXD, FILM: 3 . 74K OHM, 1% ,0 . 125W 
(R7844 ONLY) 

RES . , FXD , FILM : 3. 74K OHM, 1% , 0 . 125W 
(7844 ONLY) 

RES. , FXD .FILM: 1.24K OHM, 1%,0. 125W 
(R7844 ONLY) 

RES. , FXD, FILM: 1.24K OHM, 1%,0. 125W 
(7844 ONLY) 

RES . ,FXD , CMPSN : 47 OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 47 OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD, FILM: 1 . 74K OHM,1%,0.25W 
(R7844 ONLY) 

RES. , FXD, FILM: 1.74K OHM, 17. , 0 . 25W 
(7844 ONLY) 

RES ., FXD .FILM: 665 OHM, 1%,0. 125W 
(R7844 ONLY) 

RES . , FXD, FILM: 665 OHM, 17., 0. 125W 
(7844 ONLY) 

RES., FXD, FILM: 665 OHM, 1% ,0 . 125W 
(R7844 ONLY) 

RES. , FXD, FILM: 665 OHM, 1% , 0 . 125W 
(7844 ONLY) 

RES . , FXD, FILM: 2. 74K OHM, 1%,0. 125W 
(R7844 ONLY) 

RES . , FXD .FILM: 2. 74K OHM, 1%,0. 125W 
(7844 ONLY) 

RES . , VAR , NONWIR : 500 OHM, 10% , 0 . 50W 
(R7844 ONLY) 

RES. , VAR, NONWIR: 500 OHM, 10% ,0 . 50W 
(7844 ONLY) 

RES . , FXD, FILM: 2 . 74K OHM, 1%,0. 125W 
(R7844 ONLY) 

RES . , FXD .FILM: 2 . 74K OHM , 1% ,0 . 125W 
(7844 ONLY) 

RES ., FXD, CMPSN : 15K 0HM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN : 15K OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 750 OHM, 5% ,0 . 25W 
(R7844 ONLY) 

RES . , FXD .CMPSN : 750 OHM,57.,0.25W 
(7844 ONLY) 

RES. , FXD, FILM: 1.3K OHM, 1% , 0 . 125W 
(R7844 ONLY) 

RES., FXD, FILM: 1.3K OHM, 17»,0. 125W 
(7844 ONLY) 

RES. , FXD, CMPSN: 3. 6K OHM,5%,0.25W 
(R7844 ONLY) 

RES., FXD, CMPSN: 3. 6K OHM,5%,0.25W 
(7844 ONLY) 

RES. ,FXD,WW:2.7K 0HM,1%,3W 
(R7844 ONLY) 

RES. ,FXD,WW:2.7K 0HM,1%,3W 
(7844 ONLY) 



Mfr 

Code Mfr Part Number 



91637 


MFF1816G37400F 


91637 


MFF1816G37400F 


91637 


MFF1816G12400F 


91637 


MFF1816G12400F 


01121 


CB4705 


01121 


CB4705 


75042 


CEBTO-1 741F 


75042 


CEBT0-1741F 


91637 


MFF1816G665R0F 


91637 


MFF1816G665R0F 


91637 


MFF1816G665R0F 


91637 


MFF1816G665R0F 


91637 


MFF1816G27400F 


91637 


MFF1816G27400F 


32997 


3329P-L58-501 


32997 


3329P-L58-501 


91637 


MFF1816G27400F 


91637 


MFF1816G27400F 


01121 


CB1535 


01121 


CB1535 


01121 


CB7515 


01121 


CB7515 


91637 


MFF1816G1 3000F 


91637 


MFF1816G13000F 


01121 


CB3625 


01121 


CB3625 


91637 


NS2B-66-27000F 


91637 


NS2B-66-27000F 



8-80 



REV OCT 1981 



Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eft 


Dscont 


R1848 


315-0470-00 


B010100 


B099999X 


R1848 


315-0470-00 


B010100 


B109999X 


R1850 


315-0153-00 


B010100 


B099999X 


R1850 


315-0153-00 


B010100 


B109999X 


R1852 


315-0751-00 


B010100 


B099999X 


R1852 


315-0751-00 


B010100 


B109999X 


R1854 


321-0204-00 


B010100 


B099999X 


R1854 


321-0204-00 


B010100 


B109999X 


R1855 


315-0352-00 


B010100 


B099999X 


R1855 


315-0362-00 


B010100 


B109999X 


R1856 


308-0647-00 


B010100 


B099999X 


R1856 


308-0647-00 


B010100 


B109999X 


R1858 


315-0470-00 


B010100 


B099999X 


R1858 


315-0470-00 


B010100 


B109999X 


R1860 


311-1258-00 


B010100 


B099999X 


R1860 


311-1258-00 


B010100 


B109999X 


R1861 


301-0822-00 


B010100 


B099999X 


R1861 


301-0822-00 


B010100 


B109999X 


R1864 


317-0680-00 


B010100 


B099999X 


R1864 


317-0680-00 


B010100 


B109999X 


R1866 


315-0103-00 


B010100 


B099999X 


R1866 


315-0103-00 


B010100 


B109999X 


R1867 


315-0201-00 


B010100 


B099999X 


R1867 


315-0201-00 


B010100 


B109999X 


R1868 


301-0821-00 


B010100 


B099999X 


R1868 


301-0821-00 


B010100 


B109999X 


R1870 


311-1258-00 


B010100 


B099999X 


R1870 


311-1258-00 


BO 10100 


B109999X 


R1871 


301-0822-00 


BO 10100 


B099999X 



Name & Description 



RES . ,FXD , CMPSN : 47 DHM,5X,0.25W 
(R7844 ONLY) 

RES . , FXD, CMPSN : 47 DHM,5X,0.25W 
(7844 ONLY) 

RES . , FXD , CMPSN : 15K OHM,5X,0.25W 
( R7844 ONLY) 

RES. ,FXD,CMPSN: 15K OHM,5X,0.25W 
(7844 ONLY) 

RES. ,FXD,CMPSN: 750 OHM, 5% , 0 . 25W 
(R7844 ONLY) 

RES . , FXD , CMPSN : 750 OHM,5%,0.25W 
(7844 ONLY) 

RES . , FXD , FILM : 1 . 3K OHM , ] % ,0 . 1 25W 
( R7844 ONLY) 

RES . , FXD , FILM : 1 . 3K OHM, 1%,0. 125W 
(7844 ONLY) 

RES . , FXD , CMPSN : 3 . 6K OHM.5X.0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 3. 6K OHM,5X,0.25W 
(7844 ONLY) 

RES. ,FXD,WW:2.7K 0HM,1X,3W 
( R7844 ONLY) 

RES. ,FXD,WW:2.7K 0HM,1X,3W 
(7844 ONLY) 

RES. , FXD, CMPSN: 47 OHM,5X,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 47 OHM,5X,0.25W 
(7844 ONLY) 

RES . , VAR, NONWIR : 50 OHM, 107. , 0. 50W 
(R7844 ONLY) 

RES. , VAR, NONWIR: 50 OHM, 10% ,0 . 50W 
(7844 ONLY) 

RES. , FXD, CMPSN: 8. 2K OHM,5%,0.50W 
(R7844 ONLY) 

RES . , FXD, CMPSN : 8 . 2K OHM,5%,0.50W 
(7844 ONLY) 

RES. , FXD, CMPSN: 68 OHM, 5% , 0 . 125W 
( R7844 ONLY) 

RES . , FXD , CMPSN : 68 OHM, 5% ,0 . 125W 
(7844 ONLY) 

RES., FXD, CMPSN: 10K OHM,5X,0.25W 
( R7844 ONLY) 

RES., FXD, CMPSN: 10K OHM,5X,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 200 OHM,5X,0.25W 
(R7844 ONLY) 

RES . , FXD , CMPS N : 200 OHM , 5% , 0 . 2 5W 
(7844 ONLY) 

RES., FXD, CMPSN: 82(1 OHM,5%,0.50W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 820 OHM,5X,0.50W 
(7844 ONLY) 

RES . , VAR , NONWIR: 50 OHM , 10% ,0 . 50W 
( R7844 ONLY) 

RES. , VAR, NONWIR: 50 OHM, 10% ,0 . 50W 
(7844 ONLY) 

RES. , FXD, CMPSN: 8. 2K OHM,5X,0.50W 
(R7844 ONLY) 



Mfr 

Code Mfr Part Number 



01121 


CB4705 


01121 


CB4705 


01121 


CB1535 


01121 


CB1535 


01121 


CB7515 


01121 


CB7515 


91637 


MFF1816G13000F 


91637 


MFF1816G13000F 


01121 


CB3625 


01121 


CB3625 


91637 


NS2B-66-27000F 


91637 


NS2B-66-27000F 


01121 


CB4705 


01121 


CB4705 


32997 


3329P-L58-500 


32997 


3329P-L58-500 


01121 


EB8225 


01121 


EB8225 


01121 


BB6805 


01121 


BB6805 


01121 


CB1035 


01121 


CB1035 


01121 


CB2015 


01121 


CB2015 


01121 


EB8215 


01121 


EB8215 


32997 


3329P-L58-500 


32997 


3329P-L58-500 


01121 


EB8225 



REV OCT 1981 



8-81 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No, 


Eff 


Dscont 


R1871 


301-0822-00 


B010100 


B109999X 


R1872 


315-0751-00 


B010100 


B099999X 


R1872 


315-0751-00 


B010100 


B109999X 


R1873 


311-1265-00 


B010100 


B099999X 


R1873 


311-1265-00 


B010100 


B109999X 


R1874 


315-0821-00 


B010100 


B099999X 


R1874 


315-0821-00 


B010100 


B109999X 


R1878 


315-0162-00 


B010100 


B099999X 


R1878 


315-0162-00 


B010100 


B109999X 


R1880 


317-0680-00 


B010100 


B099999X 


R1880 


317-0680-00 


B010100 


B109999X 


R1882 


315-0103-00 


B010100 


B099999X 


R1882 


315-0103-00 


B010100 


B109999X 


R1884 


315-0102-00 


B010100 


B099999X 


R1884 


315-0102-00 


B010100 


B109999X 


R1886 


315-0512-00 


B010100 


B099999X 


R1886 


315-0512-00 


B010100 


B109999X 


R1890 


323-0321-00 


B010100 


B099999X 


R1890 


323-0321-00 


B010100 


B109999X 


R1892 


321-0244-00 


B010100 


B099999X 


R1892 


321-0244-00 


B010100 


B109999X 


R1894 


315-0182-00 


B010100 


B099999X 


R1894 


315-0182-00 


B010100 


B109999X 


R1895 


301-0623-00 


B010100 


B099999X 


R1895 


301-0623-00 


B010100 


B109999X 


R1896 


315-0390-00 


B010100 


B099999X 


R1896 


315-0390-00 


B010100 


B109999X 


R1898 


323-0364-00 


B010100 


B099999X 



Name & Description 



RES . , FXD, CMPSN : 8 . 2K OHM,5%,0.50W 
(7844 ONLY) 

RES . , FXD , CMPSN : 750 OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 750 OHM,5%,0.25W 
(7844 ONLY) 

RES . , VAR, NONWIR : 2K OHM, 10% , 0 . 50W 
(R7844 ONLY) 

RES., VAR, NONWIR :2K OHM, 10% ,0. 50W 
(7844 ONLY) 

RES., FXD, CMPSN: 820 OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD, CMPSN : 820 OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN : 1 . 6K OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD, CMPSN : 1 . 6K OHM,5%,0.25W 
(7844 ONLY) 

RES., FXD, CMPSN: 68 OHM , 5% , 0 . 125W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 68 OHM, 5%,0 . 125W 
(7844 ONLY) 

RES., FXD, CMPSN: 10K OHM,5%,0.25W 
(R7844 ONLY) 

RES., FXD, CMPSN :1 OK OHM,5%,0.25W 
(7844 ONLY) 

RES., FXD, CMPSN: IK OHM,5%,0.25W 
(R7844 ONLY) 

RES., FXD, CMPSN: IK 0HM,5%,0.25W 
(7844 ONLY) 

RES . , FXD , CMPSN : 5 . 1 K OHM,5%,0.25W 
( R7844 ONLY) 

RES., FXD, CMPSN: 5. IK OHM,5%,0.25W 
(7844 ONLY) 

RES . , FXD, FILM : 21 . 5K OHM,1%,0.50W 
(R7844 ONLY) 

RES . , FXD, FILM: 21 . 5K OHM,1%,0.50W 
(7844 ONLY) 

RES. ,FXD,FILM:3.4K OHM, 1%,0. 125W 
(R7844 ONLY) 

RES. ,FXD,FILM:3.4K OHM, 1%,0. 125W 
(7844 ONLY) 

RES. , FXD, CMPSN : 1.8K OHM,5%,0.25W 
(R7844 ONLY) 

RES., FXD, CMPSN :1.8K OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN :62K OHM,5%,0.50W 
(R7844 ONLY) 

RES. ,FXD,CMPSN:62K OHM,5%,0.50W 
(7844 ONLY) 

RES . , FXD , CMPSN : 39 0HM,5%,0.25W 
(R7844 ONLY) 

RES., FXD, CMPSN: 39 0HM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, FILM: 60. 4K OHM,1%,0.50W 
( R7844 ONLY) 



Mfr 

Code Mfr Part Number 



01121 


EB8225 


01121 


CB7515 


01121 


CB7515 


32997 


3329P-L58-202 


32997 


3329P-L58-202 


01121 


CB8215 


01121 


CB8215 


01121 


CB1625 


01121 


CB1625 


01121 


BB6805 


01121 


BB6805 


01121 


CB1035 


01121 


CB1035 


01121 


CB1025 


01121 


CB1025 


01121 


CB5125 


01121 


CB5125 


75042 


CECT0-2152F 


75042 


CECTO-21 52F 


91637 


MFF1816G34000F 


91637 


MFF1816G34000F 


01121 


CB1825 


01121 


CB1825 


01121 


EB6235 


01121 


EB6235 


01121 


CB3905 


01121 


CB3905 


91637 


MFF1226G60401F 



8-82 



REV OCT 1981 



Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eff 


Dscont 


R1898 


323-0364-00 


B010100 


B109999X 


R1903 


301-0102-00 


B010100 


B099999X 


R1903 


301-0102-00 


B010100 


B109999X 


R1904 


321-0309-00 


B010100 


B099999X 


R1904 


321-0309-00 


B010100 


8109999X 


R1906 


321-0268-00 


B010100 


B099999X 


R1906 


321-0268-00 


B010100 


B109999X 


R1907 


321-0307-00 


B010100 


B099999X 


R1907 


321-0307-00 


B010100 


B109999X 


R1920 


323-0321-00 


B010100 


B099999X 


R1920 


323-0321-00 


B010100 


B109999X 


R1922 


321-0244-00 


B010100 


B099999X 


R1922 


321-0244-00 


B010100 


B109999X 


R1924 


315-0182-00 


B010100 


B099999X 


R1924 


315-0182-00 


B010100 


B109999X 


R1925 


301-0623-00 


B010100 


B099999X 


R1925 


301-0623-00 


B010100 


B109999X 


R1926 


315-0390-00 


B010100 


B099999X 


R1926 


315-0390-00 


B010100 


B109999X 


R1927 


315-0122-00 


B010100 


B099999X 


R1927 


315-0122-00 


B010100 


B109999X 


R1928 


323-0364-00 


B010100 


B099999X 


R1928 


323-0364-00 


B010100 


B109999X 


R1934 


321-0309-00 


B010100 


B099999X 


R1934 


321-0309-00 


B010100 


B109999X 


R1936 


321-0268-00 


B010100 


B099999X 


R1936 


321-0268-00 


B010100 


B109999X 


R1937 


321-0331-00 


B010100 


B099999X 


R1937 


321-0331-00 


B010100 


B109999X 



Name & Description 



RES. ,FXD,FILM:60.4K OHM, 1% ,0. 50W 
(7844 ONLY) 

RES. ,FXD,CMPSN: IK OHM, 5% , 0. 50W 
(R7844 ONLY) 

RES.,FXD,CMPSN:1K OHM,5%,0.50W 
(7844 ONLY) 



RES . ,FXD , FILM: 16 . 2K OHM, 1Z,0. 125W 
(R7844 ONLY) 

RES. ,FXD,FILM: 16. 2K OHM, 1Z ,0. 125W 
(7844 ONLY) 

RES. , FXD, FILM: 6 . 04K OHM, 1Z,0. 125W 
(R7844 ONLY) 

RES. ,FXD,FILM:6.04K OHM, 1Z.0.125W 
(7844 ONLY) 

RES. , FXD, FILM: 15. 4K OHM, 1Z,0. 125W 
(R7844 ONLY) 

RES. , FXD, FILM: 15. 4K OHM, 1Z ,0 . 125W 
(7844 ONLY) 

RES. , FXD, FILM: 21. 5K OHM,1Z,0.50W 
(R7844 ONLY) 

RES., FXD, FILM: 21. 5K OHM,1Z,0.50W 
(7844 ONLY) 

RES . , FXD, FILM: 3 . 4K OHM, 1Z , 0 . 1 25W 
(R7844 ONLY) 

RES. , FXD, FILM: 3. 4K OHM, 1%,0. 125W 
(7844 ONLY) 

RES . , FXD , CMPSN : 1 . 8K 0HM,5Z,0.25W 
(R7844 ONLY) 

RES., FXD, CMPSN :1.8K OHM,5Z,0.25W 
(7844 ONLY) 

RES. ,FXD,CMPSN:62K OHM.5Z.0.50W 
(R7844 ONLY) 

RES. , FXD, CMPSN : 62K OHM,5Z,0.50W 
(7844 ONLY) 

RES. , FXD, CMPSN :39 0HM,5Z,0.25W 
(R7844 ONLY) 



RES., FXD, CMPSN: 39 0HM,5Z,0.25W 
(7844 ONLY) 

RES., FXD, CMPSN : 1 . 2K 0HM,5Z,0.25W 
(R7844 ONLY) 

RES., FXD, CMPSN: 1.2K OHM,5Z,0.25W 
(7844 ONLY) 

RES . , FXD, FILM: 60. 4K OHM.1Z.0.50W 
(R7844 ONLY) 

RES . , FXD, FILM: 60 . 4K OHM,1Z,0.50W 
(7844 ONLY) 

RES. , FXD, FILM: 16. 2K OHM, 1Z,0. 125W 
(R7844 ONLY) 



RES. , FXD, FILM: 16. 2K OHM, 1Z ,0 . 125W 
(7844 ONLY) 

RES. ,FXD,FILM:6.04K OHM, 1Z,0. 125W 
( R7844 ONLY) 

RES . , FXD, FILM: 6 . 04K OHM, 1Z,0. 125W 
(7844 ONLY) 



RES . , FXD .FILM : 27 .4K OHM, 1Z,0. 125W 
(R7844 ONLY) 

RES., FXD, FILM: 27. 4K OHM, 1Z , 0 . 1 25W 

(7844 ONLY) 



Mfr 

Code Mfr Part Number 



91637 


MFF1226G60401F 


01121 


EB1025 


01121 


EB1025 


91637 


MFF1816G16201F 


91637 


MFF1816G16201F 


91637 


MFF1816G60400F 


91637 


MFF 181 6G60400F 


91637 


MFF1816G15401F 


91637 


MFF1816G15401F 


75042 


CECT0-2152F 


75042 


CECT0-2152F 


91637 


MFF1816G34000F 


91637 


MFF1816G34000F 


01121 


CB1825 


01121 


CB1825 


01121 


EB6235 


01121 


EB6235 


01121 


CB3905 


01121 


CB3905 


01121 


CB1225 


01121 


CB1225 


91637 


MFF1 226G60401F 


91637 


MFF1226G60401F 


91637 


MFF1816G16201F 


91637 


MFF1816G16201F 


91637 


MFF1816G60400F 


91637 


MFF1816G60400F 


91637 


MFF1816G27401F 


91637 


MFF1816G27401F 



REV OCT 1981 



8-83 



Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 

Ckt No. Part No. Eft Dscont Name & Description 



Mfr 

Code Mfr Part Number 



R1940 


311-1268-00 


B010100 


B099999X 


R1940 


311-1268-00 


B010100 


B109999X 


R1976 


311-1274-00 


B010100 


B099999X 


R1976 


311-1274-00 


B010100 


B109999X 


R1977 


315-0680-00 


B010100 


B099999X 


R1977 


315-0680-00 


B010100 


B109999X 


R1980 


315-0270-00 


B010100 


B099999X 


R1980 


315-0270-00 


B010100 


B109999X 


R1983 


315-0680-00 


B010100 


B099999X 


R1983 


315-0680-00 


B010100 


B109999X 


R1984 


315-0104-00 


B010100 


B099999X 


R1984 


315-0104-00 


B010100 


B109999X 


R1985 


311-1274-00 


B010100 


B099999X 


R1985 


311-1274-00 


B010100 


B109999X 


R1986 


307-0103-00 


B010100 


B099999X 


R1986 


307-0103-00 


8010100 


B109999X 


R1987 


315-0104-00 


B010100 


B099999X 


R1987 


315-0104-00 


B010100 


B109999X 


R1988 


311-1274-00 


B010100 


B099999X 


R1988 


311-1274-00 


B010100 


B109999X 


R1989 


315-0390-00 


B010100 


B099999X 


R1989 


315-0390-00 


B010100 


B109999X 


R1995 


315-0390-00 


B010100 


B099999X 


R1995 


315-0390-00 


B010100 


B109999X 


R1997 


315-0390-00 


B010100 


B099999X 


R1997 


315-0390-00 


B010100 


B109999X 


R2002 


315-0470-00 






R2004 


321-0345-00 






R2008 


315-0101-00 






R2012 


315-0470-00 







RES . , VAR , NONWIR : 10K OHM , 10% , 0 . 50W 
(R7844 ONLY) 

RES. ,VAR,NONWIR: 10K OHM, 10% , 0 . 50W 
(7844 ONLY) 

RES . , VAR , NONWIR : 500K OHM , 1 0% , 0 . 50W 
(R7844 ONLY) 

RES . , VAR , NONWIR : 500K OHM , 1 0% , 0 . 50W 
(7844 ONLY) 

RES . ,FXD,CMPSN : 68 OHM,5%,0.25W 
(R7844 ONLY) 

RES . ,FXD,CMPSN : 68 0HM,5%,0.25W 
(7844 ONLY) 

RES . , FXD ,CMPSN: 27 0HM,5%,0.25W 
(R7844 ONLY) 

RES . ,FXD,CMPSN: 27 OHM,5%,0.25W 
(7844 ONLY) 

RES . , FXD, CMPSN : 68 OHM,5%,0.25W 
( R7844 ONLY) 

RES. ,FXD,CMPSN: 68 OHM,5%,0.25W 
(7844 ONLY) 

RES . ,FXD,CMPSN : 100K OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD, CMPSN : 100K 0HM,5%,0.25W 
(7844 ONLY) 

RES. , VAR, NONWIR :500K OHM, 10% ,0. 50W 
(R7844 ONLY) 

RES. , VAR, NONWIR : 500K OHM, 10%, 0 . 50W 
(7844 ONLY) 

RES . , FXD .CMPSN : 2 . 7 0HM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN : 2 . 7 OHM,5%,0.25W 
(7844 ONLY) 

RES . , FXD , CMPSN : 100K OHM,5%,0.25W 
( R7844 ONLY) 

RES., FXD, CMPSN: 100K OHM,5%,0.25W 
(7844 ONLY) 

RES. , VAR, NONWIR: 500K OHM, 10% ,0. 50W 
(R7844 ONLY) 

RES. , VAR, NONWIR : 500K OHM, 10% , 0 . 50W 
(7844 ONLY) 

RES., FXD, CMPSN: 39 OHM,5%,0.25W 
(R7844 ONLY) 

RES., FXD, CMPSN: 39 OHM,5%,0.25W 
(7844 ONLY) 

RES., FXD, CMPSN: 39 OHM,5%,0.25W 
( R7844 ONLY) 

RES . , FXD , CMPSN: 39 OHM,5%,0.25W 
(7844 ONLY) 



RES . , FXD, CMPSN : 39 OHM,5%,0.25W 
(R7844 ONLY) 

RES., FXD, CMPSN: 39 OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 47 OHM,5%,0.25W 
RES. , FXD, FILM: 38. 3K OHM, 1% , 0 . 125W 

RES., FXD, CMPSN: 100 OHM,5%,0.25W 
RES. , FXD, CMPSN: 47 OHM,5%,0.25W 



32997 3329P-L58-103 

32997 3329P-L58-103 

32997 3329P-L58-504 

32997 3329P-L58-504 

01121 CB6805 

01121 CB6805 

01121 CB2705 

01121 CB2705 

01121 CB6805 

01121 CB6805 

01121 CB1045 

01121 CB1045 

32997 3329P-L58-504 

32997 3329P-L58-504 

01121 CB27G5 

01121 CB27G5 
01121 CB1045 

01121 CB1045 

32997 3329P-L58-504 

32997 3329P-L58-504 

01121 CB3905 

01121 CB3905 

01121 CB3903 

01121 CB3905 

01121 CB3905 

01121 CB3905 

01121 CB4705 

91637 MFF1816G38301F 

01121 CB1015 

01121 CB4705 



8-84 



REV OCT 1981 





Ckt No. 



R2014 

R2018 

R2020 

R2022 

R2024 

R2026 

R2028 

R2032 

R2034 

R2036 

R2040 

R2042 

R2043 

R2046 

R2048 

R2050 

R2052 

R2054 

R2062 

R2062 

R2062 



R2062 

R2062 

R2062 



R2064 

R2068 

R2072 

R2074 

R2080 

R2082 

R2086 

R2092 

R2094 

R2096 

R2098 

R2101 

R2102 

R2104 

R2105 

R2107 

R2108 

R2109 

R2112 

R2113 

R2122 

R2123 

R2127 

R2128 

R2129 

R2135 

R2137 



Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 

Part No. Eft Dscont Name & Description 



321-0345-00 

315-0101-00 

315-0102-00 

315-0110-00 

301-0271-00 

315-0220-00 

301-0751-00 

315-0220-00 

321-0243-00 

321-0264-00 

315-0472-00 

315-0202-00 

315-0240-00 

321-0324-00 

321-0357-00 

323-0227-00 

301-0622-00 

301-0822-00 



323-0307-00 


B010100 


B010134 


323-0306-00 


B010135 


B109999 


323-0308-00 


B110000 




323-0307-00 


B010100 


B010112 


323-0306-00 


B010113 


B099999 


323-0308-00 


B100000 





315-0205-00 

311-1266-00 

321-0219-00 

321-0342-00 

311-1230-00 

315-0912-00 

315-0151-00 

315-0100-00 

315-0100-00 

315-0100-00 

315-0100-00 

315-0682-00 

315-0103-00 

315-0333-00 

315-0153-00 

315-0510-00 

315-0512-00 

315-0221-00 

315-0102-00 

315-0301-00 

315-0432-00 

315-0683-00 

315-0302-00 

311-1263-00 

315-0183-00 

315-0393-00 

315-0752-00 



RES . , FXD, FILM: 38 . 3K OHM, 1% ,0. 125W 
RES. ,FXD,CMPSN: 100 OHM,5%,0.25W 
RES. ,FXD,CMPSN:1K OHM,5%,0.25W 
RES . , FXD , CMPSN : 1 1 OHM,5%,0.25W 
RES . ,FXD ,CMPSN: 270 0HM,5%,0.50W 
RES . , FXD , CMPSN : 22 OHM,5%,0.25W 

RES . , FXD , CMPSN : 750 OHM, 5% ,0 . 50W 
RES. ,FXD,CMPSN:22 OHM,5%,0.25W 
RES . , FXD, FILM: 3 . 32K OHM, 1% ,0 . 125W 
RES . , FXD, FILM: 5 . 49K OHM, 1% , 0 . 125W 
RES . , FXD, CMPSN : 4. 7K OHM,5%,0.25W 
RES., FXD, CMPSN :2K OHM,5%,0.25W 

RES. , FXD, CMPSN: 24 OHM,5%,0.25W 
RES. , FXD, FILM: 23. 2K OHM, 1% ,0. 125W 
RES . , FXD, FILM : 51 . 1 K OHM, 1%,0. 125W 
RES . , FXD , FILM: 2 . 26K OHM,1%,0.50W 
RES . , FXD , CMPSN : 8 . 2.K OHM,5%,0.50W 
RES . , FXD, CMPSN: 8 . 2K OHM,5%,0.50W 

RES. , FXD, FILM: 15. 4X OHM,1%,0.50W 
(7844 ONLY) 

RES., FXD, FILM :15K OHM,1%,0.50W 
(7844 ONLY) 

RES. , FXD, FILM: 15. 8K 0HM,1%,0.50W 
(7844 ONLY) 

RES. , FXD, FILM: 15. 4K OHM,l%,0.5OW 
(R7844 ONLY) 

RES. , FXD, FILM: 15K 0HM,1%,0.50W 
(R7844 ONLY) 

RES., FXD, FILM: 15. 8K OHM,1%,0.50W 
(R7844 ONLY) 

RES. , FXD, CMPSN :2M OHM,5%,0.25W 
RES . , VAR.NONWIR : 2 . 5K OHM, 10%, 0. 50W 
RES. , FXD, FILM: 1.87K OHM, 1% , 0 . 1 25W 
RES. ,FXD,FILM:35. 7K OHM, 1%,0. 125W 
RES . , VAR, NONWIR: 20K OHM, 20% , 0 . 50W 
RES . , FXD , CMPSN : 9 . IK OHM,5%,0.25W 

RES. , FXD, CMPSN: 150 OHM, 5% , 0 . 25VJ 
RES. ,FXD, CMPSN: 10 0HM,5%,0.25W 
RES., FXD, CMPSN: 10 OHM,5%,0.25W 
RES., FXD, CMPSN: 10 OHM,5%,0.25W 
RES., FXD, CMPSN: 10 OHM,5%,0.25W 
RES . , FXD , CMPSN : 6 . 8K 0HM,5%,0.25W 

RES. , FXD, CMPSN :1 OK OHM,5%,0.25W 
RES. , FXD, CMPSN : 33K OHM,5%,0.25W 
RES., FXD, CMPSN: 1511 0HM,5%,0.25W 
RES . , FXD , CMPSN : 51 OHM,5%,0.25W 
RES. , FXD, CMPSN: 5. IK OHM,5%,0.25W 
RES., FXD, CMPSN: 220 OHM,5%,0.25W 

RES., FXD, CMPSN: IK OHM,5%,0.25W 
RES. , FXD, CMPSN: 300 OHM,5%,0.25W 
RES. , FXD, CMPSN: 4. 3K OHM,5%,0.25W 
RES., FXD, CMPSN: 68K OHM,5%,0.25W 
RES. , FXD, CMPSN :3K OHM,5%,0.25W 
RES. , VAR, NONWIR: IK OHM, 10% ,0 . 50W 

RES., FXD, CMPSN: 18K OHM,5%,0.25W 
RES. , FXD, CMPSN: 39K OHM,5%,0.25W 
RES. , FXD, CMPSN: 7. 5K OHM,5%,0.25W 



Mfr 

Code Mfr Part Number 



91637 


MFF1816G38301F 


01121 


CB1015 


01121 


CB1025 


01121 


CB1105 


01121 


EB2715 


01121 


CB2205 


01121 


EB7515 


01121 


CB2205 


91637 


MFF1816G33200F 


91637 


MFF1816G54900F 


01121 


CB4725 


01121 


CB2025 


01121 


CB2405 


91637 


MFF1816G23201F 


91637 


MFF181 6G51 101F 


75042 


CECT0-2261F 


01121 


EB8225 


01121 


EB8225 


75042 


CECTO-1 542F 


75042 


CECTO-1 502F 


75042 


CECT0-1582F 



75042 


CECTO-1 542F 


75042 


CECTO-1 502F 


75042 


CECTO-1 582F 



01121 


CB2055 


32997 


3329P-L58-252 


91637 


MFF1816G18700F 


91637 


MFF1816G35701F 


32997 


3386F-T04-203 


01121 


CB9125 


01121 


CB1515 


01121 


CB1005 


01121 


CB1005 


01121 


CB1005 


01121 


CB1005 


01121 


CB6825 


01121 


CB1035 


01121 


CB3335 


01121 


CB1535 


01121 


CB5105 


01121 


CB5125 


01121 


CB2215 


01121 


CB1025 


01121 


CB3015 


01121 


CB4325 


01121 


CB6835 


01121 


CB3025 


32997 


3329P-L58-102 


01121 


CB1835 


01121 


CB3935 


01121 


CB7525 



REV OCT 1981 



8-85 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. Mfr 



Ckt No. 


Part No. Eff 


Dscont 




Name & Description 


Code 


Mfr Part Number 


R2139 


315-0242-00 




RES. 


, FXD , CMPSN : 2 . 4K OHM,5%,0.25W 


01121 


CB2425 


R2144 


315-0104-00 




RES. 


, FXD , CMPSN : 1 OOK OHM,5%,0.25W 


01121 


CB1045 


R2146 


315-0152-00 




RES. 


, FXD, CMPSN :1.5K OHM, 5% ,0 . 25W 


01121 


CB1525 


R2148 


315-0103-00 




RES. 


, FXD, CMPSN: 10K OHM,5%,0.25W 


01121 


CB1035 


R2150 


321-0403-00 




RES. 


, FXD, FILM :154K OHM, 1% , 0 . 125W 


91637 


MFF1816G15402F 


R2151 


321-0372-00 




RES. 


, FXD, FILM: 73. 2K OHM, 1%,0. 125W 


91637 


MFF1816G73201F 


R2153 


315-0103-00 




RES. 


, FXD, CMPSN :1 OK 0HM.5X.0.25W 


01121 


CB1035 


R2155 


315-0512-00 




RES. 


, FXD, CMPSN: 5 . IK OHM,5%,0.25W 


01121 


CB5125 


R2158 


315-0152-00 




RES. 


, FXD, CMPSN :1.5K OHM,5%,0.25W 


01121 


CB1525 


R2161 


315-0102-00 




RES. 


, FXD, CMPSN: IK OHM,5%,0.25W 


01121 


CB1025 


R2162 


315-0751-00 




RES. 


, FXD, CMPSN: 750 OHM,5%,0.25W 


01121 


CB7515 


R2163 


315-0751-00 




RES. 


, FXD, CMPSN: 750 OHM,5%,0.25W 


01121 


CB7515 


R2165 


315-0102-00 




RES. 


, FXD, CMPSN: IK OHM, 57. , 0 . 25W 


01121 


CB1025 


R2166 


315-0751-00 




RES. 


, FXD, CMPSN: 750 OHM,5%,0.25W 


01121 


CB7515 


R2167 


315-0751-00 




RES. 


, FXD, CMPSN: 750 0HM,5%,0.25W 


01121 


CB7515 


R2169 


315-0102-00 




RES. 


, FXD , CMPSN : IK OHM,5%,0.25W 


01121 


CB1025 


R2170 


315-0751-00 




RES. 


, FXD, CMPSN: 750 OHM,5%,0.25W 


01121 


CB7515 


R2171 


315-0751-00 




RES. 


, FXD , CMPSN: 750 OHM,5%,0.25W 


01121 


CB7515 


R2173 


315-0102-00 




RES. 


, FXD , CMPSN : IK OHM,5%,0.25W 


01121 


CB1025 


R2174 


315-0751-00 




RES. 


, FXD, CMPSN: 750 OHM,5%,0.25W 


01121 


CB7515 


R2175 


315-0751-00 




RES. 


, FXD, CMPSN: 750 OHM,5%,0.25W 


01121 


CB7515 


R2177 


315-0511-00 




RES. 


, FXD, CMPSN: 510 OHM,5%,0.25W 


01121 


CB5115 


R2178 


315-0511-00 




RES. 


, FXD , CMPSN : 510 OHM,5%,0.25W 


01121 


CB5115 


R2179 


315-0511-00 




RES. 


, FXD, CMPSN: 5 10 OHM,5%,0.25W 


01121 


CB5115 


R2182 


321-0262-00 




RES. 


, FXD, FILM: 5 . 23K OHM, 1% , 0 . 125W 


91637 


MFF1816G52300F 


R2183 


311-1224-00 




RES. 


, VAR , NONWIR : 500 OHM, 20% ,0 . 50W 


32997 


3386F-T04-501 


R2191 


315-0513-00 




RES. 


,FXD, CMPSN: 51K 0HM,5%,0.25W 


01121 


CB5135 


R2192 


315-0133-00 




RES. 


, FXD, CMPSN :13K OHM,5%,0.25W 


01121 


CB1335 


R2193 


315-0133-00 




RES. 


, FXD, CMPSN : 13K OHM,5%,0.25W 


01121 


CB1335 


R2194 


315-0753-00 




RES. 


, FXD, CMPSN :75K 0HM,5%,0.25W 


01121 


CB7535 


R2196 


321-0308-00 




RES. 


, FXD .FILM : 15 . 8K OHM, 1%,0. 125W 


91637 


MFF1816G15801F 


R2197 


315-0513-00 




RES. 


, FXD, CMPSN: 5 IK OHM,5%,0.25W 


01121 


CB5135 


R2198 


321-0319-00 




RES. 


, FXD .FILM : 20 . 5K OHM, 1% ,0 . 125W 


91637 


MFF1816G20501F 


R2199 


321-0335-00 




RES. 


, FXD, FILM: 30. IK OHM, 1% , 0 . 125W 


91637 


MFF1816G30101F 


R2201 


315-0154-00 




RES. 


, FXD, CMPSN :150K OHM,5X,0.25W 


01121 


CB1545 


R2202 


321-0335-00 




RES. 


, FXD , FILM: 30 . IK OHM, 1% ,0 . 125W 


91637 


MFF1816G30101F 


R2203 


321-0344-00 




RES. 


, FXD, FILM: 37. 4K OHM , 1% , 0 . 125W 


91637 


MFF1816G37401F 


R2204 


321-0335-00 




RES. 


, FXD, FILM: 30. IK OHM,1%,0.125W 


91637 


MFF1816G30101F 


R2206 


315-0513-00 




RES. 


,FXD,CMPSN:51K OHM,5%,0.25W 


01121 


CB5135 


R2207 


315-0154-00 




RES. 


, FXD, CMPSN : 150K OHM,5%,0.25W 


01121 


CB1545 


R2208 


321-0335-00 




RES. 


, FXD .FILM: 30 . IK OHM, 1%,0. 125W 


91637 


MFF1816G30101F 


R2209 


321-0335-00 




RES. 


, FXD , FILM : 30 . IK OHM, 1%,0. 125W 


91637 


MFF1816G30101F 


R2211 


315-0752-00 




RES. 


, FXD, CMPSN: 7. 5K OHM,5%,0.25W 


01121 


CB7525 


R2213 


321-0259-00 




RES. 


,FXD,FILM:4.87K OHM, 1%,0. 125W 


91637 


MFF1816G48700F 


R2214 


311-1224-00 




RES. 


, VAR, NONWIR: 500 OHM , 20% , 0 . 50W 


32997 


3386F-T04-501 


R2215 


315-0133-00 




RES. 


, FXD, CMPSN :13K OHM,5%,0.25W 


01121 


CB1335 


R2217 


315-0124-00 




RES. 


, FXD, CMPSN: 120K 0HM,5%,0.25W 


01121 


CB1245 


R2219 


315-0751-00 




RES. 


, FXD, CMPSN: 750 OHM,5X,0.25W 


01121 


CB7515 


R2220 


321-0299-00 




RES. 


, FXD .FILM: 12 . 7K OHM, 1%,0. 125W 


91637 


MFF1816G12701F 


R2221 


321-0212-00 




RES. 


, FXD, FILM :1.58K OHM, 1X,0. 125W 


91637 


MFF1816G15800F 


R2226 


315-0222-00 




RES. 


, FXD, CMPSN: 2. 2K OHM,5%,0.25W 


01121 


CB2225 


R2227 


321-0268-00 




RES. 


, FXD , F ILM : 6 . 04K OHM, 1%,0. 125W 


91637 


MFF1816G60400F 


R2229 


321-0210-00 




RES. 


, FXD, FILM: 1.5K OHM, 1%,0. 125W 


91637 


MFF1816G15000F 


R2231 


315-0303-00 




RES. 


, FXD, CMPSN :30K OHM,5%,0.25W 


01121 


CB3035 


R2235 


315-0203-00 




RES. 


, FXD, CMPSN :20K OHM,5X,0.25W 


01121 


CB2035 


R2236 


315-0203-00 




RES. 


, FXD, CMPSN :20K OHM,5%,0.25W 


01121 


CB2035 


R2237 


315-0203-00 




RES. 


, FXD, CMPSN :20K OHM,5X,0.25W 


01121 


CB2035 



8-86 



REV OCT 1981 





Replaceable Electrical Parts— 7844 /R 7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eff Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Number 


R2238 


315-0203-00 






RES . .FXD.CMPSN : 20K OHM, 5% , 0 . 25W 


01121 


CB2035 


R2241 


321-0326-00 






RES. ,FXD,FILM: 24. 3K OHM, 1% , 0 . 125W 


91637 


MFF1816G24301F 


R2251 


315-0102-00 






RES. , FXD.CMPSN: IK OHM,5X,0.25W 


01121 


CB1025 


R2252 


315-0102-00 






RES. ,FXD,CMPSN: IK 0HM,5X,0.25W 


01121 


CB1025 


R2253 


315-0102-00 






RES . , FXD ,CMPSN : IK OHM,5Z,0.25W 


01121 


CB1025 


R2254 


315-0303-00 






RES . , FXD.CMPSN: 30K 0HM,5%,0.25W 


01121 


CB3035 


R2261 


315-0272-00 






RES . ,FXD,CMPSN : 2 . 7K 0HM,5%,0.25W 


01121 


CB2725 


R2262 


315-0102-00 






RES. , FXD.CMPSN: IK OHM.5Z.0.25W 


01121 


CB1025 


R2265 


315-0512-00 






RES. , FXD.CMPSN: 5. IK OHM,5%,0.25W 


01121 


CB5125 


R2266 


315-0912-00 






RES . , FXD.CMPSN : 9 . IK OHM.5X.0.25W 


01121 


CB9125 


R2268 


321-0296-00 


B010100 


B 14 1 9 1 9 


RES . , FXD .FILM: 11 . 8K OHM, 1Z.0. 125W 


91637 


MFF1816G11801F 










(7844 ONLY) 






R2268 


321-0297-00 


B141920 




RES . , FXD .FILM: 12 . IK OHM, 1%,0. 125W 


91637 


MFF1816G12101F 










(7844 ONLY) 






R2268 


321-0296-00 


B010100 


B140969 


RES. , FXD, FILM: 11 .8K OHM, 1%,0. 125W 


91637 


MFF1816G11801F 










(R7844 ONLY) 






R2268 


321-0297-00 


B140970 




RES . , FXD .FILM: 12 . IK OHM, IX, 0. 125W 


91637 


MFF1816G12101F 










(R7844 ONLY) 






R2273 


311-1226-00 






RES . , VAR, NONWIR: 2 . 5K OHM, 20X ,0. 50W 


32997 


3386F-T04-252 


R2274 


321-0153-00 






RES . , FXD .FILM: 383 OHM, 1% ,0. 125W 


91637 


MFF1816G383R0F 


R2275 


321-0170-00 






RES . , FXD, FILM: 576 OHM, IX ,0 . 125W 


91637 


MFF1816G576R0F 


R2276 


315-0223-00 






RES. .FXD.CMPSN : 22K OHM,5Z,0.25W 


01121 


CB2235 


R2277 


321-0250-00 






RES . ,FXD .FILM: 3. 92K OHM, 1% ,0 . 1 25W 


91637 


MFF1816G39200F 


R2278 


315-0823-00 






RES. .FXD.CMPSN :82K OHM,5%,0.25W 


01121 


CB8235 


R2279 


321-0222-00 






RES. ,FXD,FILM:2K OHM, 1Z,0. 125W 


91637 


MFF1816G20000F 


R2280 


315-0823-00 






RES . , FXD.CMPSN : 82K OHM,5X,0.25W 


01121 


CB8235 


R2281 


315-0101-00 


XB0101 10 




RES. .FXD.CMPSN: 100 OHM,5X,0.25W 


01121 


CB1015 


R2282 


315-0332-00 






RES. , FXD.CMPSN: 3. 3K 0HM,5Z,0.25W 


01121 


CB3325 


R2283 


315-0753-00 






RES. .FXD.CMPSN :75K 0HM.5Z.0.25W 


01121 


CB7535 


R2284 


321-0216-00 






RES., FXD, FILM :1.74K OHM, 1% , 0. 125W 


91637 


MFF1816G1 7400F 


R2285 


321-0245-00 






RES. , FXD.FILM: 3 .48K OHM, 1%,0. 125W 


91637 


MFF1816G34800F 


R2286 


321-0209-00 


B010100 


B110889 


RES. , FXD, FILM: 1.47K OHM, 1%,0.125W 


91637 


MFF181 6G14700F 










(7844 ONLY) 






R2286 


321-0210-00 


B1 10890 




RES. , FXD, FILM: 1.5K OHM, IX , 0 . 125W 


91637 


MFF1816G15000F 










(7844 ONLY) 






R2286 


321-0209-00 


B010100 


B100450 


RES. , FXD, FILM: 1.47K OHM, 1% ,0 . 1 25W 


91637 


MFF1816G14700F 










( R7844 ONLY) 






R2286 


321-0210-00 


B100451 




RES . , FXD , FILM : 1 . 5K OHM, IX ,0 . 125W 


91637 


MFF1816G15000F 










(R7844 ONLY) 






R2287 


321-0199-00 






RES . , FXD .FILM : 1 . 1 5K OHM, IX, 0. 125W 


91637 


MFF1816G11500F 


R2288 


321-0273-00 






RES . ,FXD , FILM: 6. 81 K OHM, IX, 0. 125W 


91637 


MFF1816G68100F 


R2289 


321-0193-00 






RES., FXD, FILM: IK OHM, IX ,0 . 125W 


91637 


MFF1816G10000F 


R2291 


311-1225-00 






RES . , VAR, NONWIR : IK OHM, 20% , 0 . 50W 


32997 


3386F-T04-1 02 


R2292 


315-0132-00 






RES . , FXD.CMPSN : 1 . 3K OHM,5Z,0.25W 


01121 


CB1325 


R2293 


321-0245-00 






RES. , FXD, FILM : 3 . 48K OHM,1X,0.125W 


91637 


MFF1816G34800F 


R2294 


321-0255-00 






RES . , FXD , FILM: 4.4 2K OHM, IX, 0. 125W 


91637 


MFF1816G44200F 


R2295 


321-0241-00 






RES . , FXD , FILM: 3 . 1 6K OHM, 1Z,0. 125W 


91637 


MFF1816G31600F 


R2297 


315-0152-00 






RES . , FXD.CMPSN : 1 . 5K OHM, 5X , 0 . 25W 


01121 


CB1525 


R2298 


315-0102-00 






RES., FXD.CMPSN: IK 0HM,5Z,0.25W 


01121 


CB1025 


R2299 


315-0431-00 






RES . , FXD,CMPSN:430 OHM,5X,0.25W 


01121 


CB4315 


R2302 


315-0471-00 






RES. ,FXD,CMPSN:470 OHM,5X,0.25W 


01121 


CB4715 


R2303A.B 


307-0290-01 






RES. , FXD, FILM: 500K OHM/29. 65M OHM 


80009 


307-0290-01 


R2304 


301-0102-00 






RES. , FXD.CMPSN: IK OHM,5Z,0.50W 


01121 


EB1025 


R2306 


315-0472-00 






RES. , FXD.CMPSN: 4. 7K OHM,5Z,0.25W 


01121 


CB4725 


R2307 


315-0560-00 






RES., FXD.CMPSN: 56 0HM,5X,0.25W 


01121 


CB5605 


R2308 


301-0331-00 






RES. .FXD.CMPSN: 330 0HM,5X,0.50W 


01121 


EB3315 


R2310 


315-0472-00 






RES., FXD.CMPSN: 4. 7K 0HM,5X,0.25W 


01121 


CB4725 



REV OCT 1981 



8-87 



Replaceable Electrical Parts— 7844/R7844 Service 



Tektronix Serial/Model No. 



Mfr 



Ckt No. Part No. Eft Dscont Name & Description Code Mfr Part Number 



R2311 


301-0152-00 


RES . , FXD, CMPSN : 1 . 5K OHM,5%,0.50W 


01121 


EB1525 


R2312 


315-0472-00 


RES . , FXD , CMPSN :4 . 7K OHM,5%,0.25W 


01121 


CB4725 


R2314 


315-0130-00 


RES . , FXD , CMPSN : 13 OHM,5%,0.25W 


01121 


CB1305 


R2316 


307-0106-00 


RES . , FXD , CMPSN : 4. 7 OHM,5%,0.25W 


01121 


CB47G5 


R2318 


315-0104-00 


RES. , FXD, CMPSN :100K OHM, 5% ,0 . 25W 


01121 


CB1045 


R2320 


301-0624-00 


RES. , FXD, CMPSN :620K OHM,5%,0.50W 


01121 


EB6245 


R2321 


301-0624-00 


RES. , FXD, CMPSN :620K OHM,5%,0.50W 


01121 


EB6245 


R2322 


301-0155-00 


RES. , FXD, CMPSN : 1.5M OHM,5%,0.50W 


01121 


EB1555 


R2323 


301-0155-00 


RES., FXD, CMPSN :1.5M OHM,5%,0.5OW 


01121 


EB1555 


R2325 


315-0183-00 


RES . , FXD , CMPSN : 18K OHM, 52,0. 25W 


01121 


CB1835 


R2326 


315-0226-00 


RES. , FXD, CMPSN: 22M 0HM,5Z,0.25W 


01121 


CB2265 


R2327 


315-0104-00 


RES. , FXD, CMPSN: 100K OHM,5Z,0.25W 


01121 


CB1045 


R2330 


301-0624-00 


RES. , FXD, CMPSN :620K OHM,5Z,0.50W 


01121 


EB6245 


R2331 


301-0624-00 


RES., FXD, CMPSN :620K 0HM,5%,0.50W 


01121 


EB6245 


R2332 


301-0155-00 


RES. , FXD, CMPSN: 1.5M OHM,5Z,O.50W 


01121 


EB1555 


R2333 


301-0155-00 


RES., FXD, CMPSN : 1 . 5M OHM,52,0.50W 


01121 


EB1555 


R2335 


315-0183-00 


RES., FXD, CMPSN :18K 0HM,5Z,0.25W 


01121 


CB1835 


R2336 


315-0226-00 


RES. , FXD, CMPSN :22M OHM, 52 ,0 . 25W 


01121 


CB2265 


R2337 


315-0104-00 


RES. , FXD, CMPSN :100K OHM,5Z,0.25W 


01121 


CB1045 


R2342 


301-0155-00 


RES., FXD, CMPSN: 1.5M OHM,5Z,0.50W 


01121 


EB1555 


R2343 


301-0155-00 


RES., FXD, CMPSN: 1.5M OHM,5Z,0.50W 


01121 


EB1555 


R2345 


315-0183-00 


RES., FXD, CMPSN :18K 0HM,5%,0.25W 


01121 


CB1835 


R2346 


315-0226-00 


RES. , FXD, CMPSN : 22M OHM,5Z,0.25W 


01121 


CB2265 


R2347 


315-0104-00 


RES. , FXD, CMPSN: 100K 0HM,5%,0.25W 


01121 


CB1045 


R2352 


301-0155-00 


RES., FXD, CMPSN : 1 . 5M OHM,5%,0.50W 


01121 


EB1555 


R2353 


301-0155-00 


RES. , FXD, CMPSN : 1 . 5M OHM,5%,0.50W 


01121 


EB1555 


R2355 


315-0183-00 


RES. , FXD, CMPSN: 18K OHM,5%,0.25W 


01121 


CB1835 


R2356 


315-0226-00 


RES . , FXD , CMPSN : 22M 0HM,5Z,0.25W 


01121 


CB2265 


R2357 


315-0104-00 


RES. , FXD, CMPSN : 100K OHM.5Z.0.25W 


01121 


CB1045 


R2400 


315-0103-00 


RES . , FXD, CMPSN : 10K OHM, 52,0. 25W 


01121 


CB1035 


R2401 


315-0104-00 


RES., FXD, CMPSN: 100K 0HM,5%,0.25W 


01121 


CB1045 


R2402 


315-0103-00 


RES., FXD, CMPSN: 10K OHM,5%,0.25W 


01121 


CB1035 


R2403 


315-0104-00 


RES. , FXD, CMPSN : 100K OHM,5Z,0.25W 


01121 


CB1045 


R2404 


315-0105-00 


RES. , FXD, CMPSN : 1M OHM,5Z,0.25W 


01121 


CB1055 


R2405 


315-0104-00 


RES. , FXD, CMPSN :100K OHM,5%,0.25W 


01121 


CB1045 


R2406 


315-0104-00 


RES., FXD, CMPSN: 100K 0HM,5%,0.25W 


01121 


CB1045 


R2407 


315-0105-00 


RES., FXD, CMPSN :1M OHM, 52,0. 25W 


01121 


CB1055 


R2408 


315-0101-00 


RES., FXD, CMPSN: 100 OHM,5Z,0.25W 


01121 


CB1015 


R2409 


315-0101-00 


RES. , FXD, CMPSN: 100 OHM, 52,0. 25W 


01121 


CB1015 


R2410 


322-0473-00 


RES. , FXD, FILM: 825K OHM, 12,0. 25W 


75042 


CEBTO-8253F 


R2412 


322-0621-00 


RES. , FXD, FILM: 900K OHM, 12,0. 25W 


75042 


CEBT0-9003F 


R2414 


322-0621-00 


RES. , FXD .FILM: 900K OHM,1Z,0.25W 


75042 


CEBT0-9003F 


R2416 


311-1753-00 


RES. ,VAR,NONWIR: 1M OHM, 102 ,0 . 50W 


12697 


382-CM40419 


R2418 


301-0105-00 


RES. , FXD, CMPSN :1M OHM,5Z,0.50W 


01121 


EB1055 


R2419 


301-0105-00 


RES., FXD, CMPSN :1M 0HM,52,0.50W 


01121 


EB1055 


R2420 


301-0105-00 


RES., FXD, CMPSN : 1M OHM,5Z,0.50W 


01121 


EB1055 


R2421 


301-0105-00 


RES., FXD, CMPSN :1M OHM,52,0.5OW 


01121 


EB1055 


R2422 


301-0105-00 


RES. , FXD, CMPSN : 1M OHM.52.0.50W 


01121 


EB1055 


R2423 


301-0105-00 


RES. , FXD, CMPSN :1M OHM.52.0.50W 


01121 


EB1055 


R2430 


322-0473-00 


RES. ,FXD,FILM:825K OHM, 12,0. 25W 


75042 


CEBTO-8253F 


R2432 


322-0621-00 


RES . ,FXD ,FILM: 900K OHM, 12,0. 25W 


75042 


CEBT0-9003F 


R2434 


322-0621-00 


RES. , FXD, FILM: 900K OHM,1Z,0.25W 


75042 


CEBT0-9003F 


R2436 


311-1753-00 


RES. , VAR, NONWIR: 1M OHM , 10% , 0. 50W 


12697 


382-CM40419 


R2438 


301-0105-00 


RES., FXD, CMPSN: 1M OHM,5Z,0.50W 


01121 


EB1055 


R2439 


301-0105-00 


RES., FXD, CMPSN :1M OHM,52,0.50W 


01121 


EB1055 


R2440 


301-0105-00 


RES., FXD, CMPSN :1M OHM,52,0.50W 


01121 


EB1055 


R2441 


301-0105-00 


RES. , FXD, CMPSN : 1M 0HM,52,0.50W 


01121 


EB1055 



8-88 



REV OCT 1981 




Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 



Tektronix Serial/Model No. 
Part No. Eft Dscont 



Name & Description 



Mfr 

Code Mfr Part Number 



R2442 


301-0105-00 






RES . , FXD , CMPSN : 1M OHM,5%,0.50W 


01121 


EB1055 


R2443 


301-0105-00 






RES. ,FXD, CMPSN: 1M OHM,5%,0.50W 


01121 


EB1055 


R2444 


301-0105-00 






RES. , FXD, CMPSN : 1M OHM,5%,0.50W 


01121 


EB1055 


R2445 


315-0202-00 






RES. , FXD, CMPSN :2K OHM , 5% ,0 . 25W 


01121 


CB2025 


R2446 


315-0104-00 






RES. , FXD, CMPSN :100K OHM,5%,0.25W 


01121 


CB1045 


R2447 


315-0205-00 






RES. , FXD, CMPSN :2M OHM,5%,0.25W 


01121 


CB2055 


R2449 


315-0474-00 






RES. , FXD, CMPSN :470K OHM,5%,0.25W 


01121 


CB4745 


R2450 


321-0285-00 






RES., FXD, FILM: 9. 09K OHM, 1%,0. 125W 


91637 


MFF1816G90900F 


R2451 


321-0368-00 


B010100 


B010135 


RES. , FXD, FILM: 66. 5K OHM, 1% , 0 . 125W 
(7844 ONLY) 


91637 


MFF1816G66501F 


R2451 


321-0260-00 


B010136 




RES. ,FXD,FILM:4.99K OHM,1%,0.125W 
(7844 ONLY) 


91637 


MFF1816G49900F 


R2451 


321-0368-00 


B010100 


B010112 


RES. , FXD, FILM: 66. 5K OHM, 1 % , 0 . 125W 
(R7844 ONLY) 


91637 


MFF1816G66501F 


R2451 


321-0260-00 


B010113 




RES . ,FXD , FILM: 4 . 99K OHM, 1% , 0 . 125W 
(R7844. ONLY) 


91637 


MFF1816G49900F 


R2452 


321-0431-00 


B010100 


B010135 


RES., FXD, FILM: 1M OHM, I%,0. 125W 
(7844 ONLY) 


24546 


NA4D1004F 


R2452 


321-0373-00 


B010136 




RES. , FXD, FILM: 7 5K OHM, 1%,0.125W 
(7844 ONLY) 


91637 


MFF1816G75001F 


R2452 


321-0481-00 


B010100 


B010112 


RES. , FXD, FILM: 1M OHM , 1 % , 0 . 1 2 5W 
(R7844 ONLY) 


24546 


NA4D1004F 


R2452 


321-0373-00 


B010113 




RES . , FXD, FILM: 75K OHM, 1X.0.125W 
(R7844 ONLY) 


91637 


MFF1816G75001F 


R2454 


311-1286-00 






RES. , VAR,NONWIR: 50K OHM, 102,0. 5W 


32997 


3329W-L58-503 


R2455 


321-0436-00 






RES. , FXD, FILM: 340K OHM, 1% , 0 . 125W 


91637 


MFF1816G34002F 


R2456 


321-0331-00 






RES . , FXD , F ILM : 2 7 . 4K OHM, 1% , 0 . 125W 


91637 


MFF1816G27401F 


R2457 


315-0473-00 






RES. , FXD, CMPSN :47K OHM,5%,0.25W 


01121 


CB4735 


R2459 


315-0334-00 






RES. , FXD, CMPSN: 330K OHM,5%,0.25W 


01121 


CB3345 


R2460 


315-0102-00 






RES., FXD, CMPSN: IK OHM,5%,0.25W 


01121 


CB1025 


R2461 


315-0102-00 






RES. , FXD, CMPSN: IK OHM,5%,0.25W 


01121 


CB1025 


R2463 


311-1282-00 






RES. ,VAR,NONWIR: 5K OHM, 10% ,0. 50W 


32997 


3329W-L58-502 


R2464 


315-0222-00 






RES. , FXD, CMPSN: 2. 2K OHM,5%,0.25W 


01121 


CB2225 


R2465 


315-0203-00 






RES. , FXD, CMPSN : 20K OHM,5%,0.25W 


01121 


CB2035 


R2466 


315-0101-00 






RES. , FXD, CMPSN: 100 0HM,5%,0.25W 


01121 


CB1015 


R2467 


315-0432-00 






RES. , FXD, CMPSN: 4. 3K OHM,5%,0.25W 


01121 


CB4325 


R2468 


315-0153-00 






RES., FXD, CMPSN: 15K OHM,5%,0.25W 


01121 


CB1535 


R2474 


301-0105-00 






RES. , FXD, CMPSN : 1M OHM,5%,0.50W 


01121 


EB1055 


R2475 


315-0202-00 






RES. , FXD, CMPSN :2K 0HM,5%,0.25W 


01121 


CB2025 


R2476 


315-0104-00 






RES. , FXD, CMPSN : 100K OHM,5%,0.25W 


01121 


CB1045 


R2477 


315-0184-00 






RES. , FXD, CMPSN :180K OHM,5%,0.25W 


01121 


CB1845 


R2479 


315-0473-00 






RES. , FXD, CMPSN :47K OHM,5%,0.25W 


01121 


CB4735 


R2480 


315-0132-00 






RES. , FXD, CMPSN : 1 . 3K 0HM,5%,0.25W 


01121 


CB1325 


R2481 


321-0260-00 






RES. ,FXD,FILM:4.99K OHM, 1% ,0 . 125W 


91637 


MFF 1 8 1 6G49900F 


R2482 


321-0373-00 






RES. , FXD, FILM: 75K OHM, 1Z.0.125W 


91637 


MFF1816G75001F 


R2484 


311-1282-00 






RES. ,VAR,N0NWIR:5K OHM, 10%, 0. 50W 


32997 


3329W-L58-502 


R2485 


321-0336-00 


B010100 


B141003 


RES. , FXD, FILM: 30. 9K OHM, 1% ,0. 125W 
(7844 ONLY) 


91637 


MFF1816G30901F 


R2485 


321-0335-00 


B141004 




RES. ,FXD,FILM:30. IK OHM, 1%,0. 125W 
(7844 ONLY) 


91637 


MFF1816G30101F 


R2485 


321-0336-00 


B010100 


B142027 


RES. , FXD, FILM: 30. 9K OHM, 1% , 0. 125W 
(R7844 ONLY) 


91637 


MFF1 8 16G30901 F 


R2485 


321-0335-00 


B142028 




RES. , FXD, FILM: 30. IK OHM, 1% ,0. 125W 
(R7844 ONLY) 


91637 


MFF1816G30101F 


R2486 


321-0229-00 






RES . , FXD, FILM: 2 . 37K OHM, 1% ,0 . 125W 


91637 


MFF1816G23700F 


R2487 


315-0102-00 






RES . , FXD, CMPSN : IK OHM,5%,0.25W 


01121 


CB1025 


R2489 


315-0103-00 






RES. , FXD, CMPSN : 1 OK OHM,5%,0.25W 


01121 


CB1035 



REV OCT 1981 



8-89 




Replaceable Electrical Parts— 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eff Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Number 


R2490 


315-0391-00 






RES . , FXD ,CMPSN : 390 OHM,5%,0.25W 


01121 


CB3915 


R2491 


315-0101-00 






RE S . , FXD , CMPSN : 1 00 OHM,5%,0.25W 


01121 


CB1015 


R2492 


321-0322-00 






RES . ,FXD ,FILM: 22 . IK OHM, 1%,0. 125W 


91637 


MFF1816G22101F 


R2493 


311-1282-00 






RES. ,VAR,N0NWIR:5K OHM, 102,0. 50W 


32997 


3329W-L58-502 


R2494 


315-0222-00 






RES. , FXD, CMPSN: 2. 2K OHM, 52 , 0 . 25W 


01121 


CB2225 


R2493 


315-0203-00 






RES. , FXD, CMPSN : 20K OHM,5%,0.25W 


01121 


CB2035 


R2496 


315-0101-00 






RES., FXD, CMPSN: 100 OHM,52,0.25W 


01121 


CB1015 


R2497 


315-0432-00 






RES. , FXD, CMPSN: 4. 3K CHM,5%,0.25W 


01121 


CB4325 


R2498 


315-0153-00 






RES. , FXD, CMPSN :15K OHM,5%,0.25W 


01121 


CB1535 


R2499 


315-0201-00 






RES. , FXD, CMPSN: 200 OHM,5%,0.25W 


01121 


CB2015 


R2523 


315-0470-00 






RES . , FXD , CMPSN : 47 OHM,5%,0.25W 


01121 


CB4705 


R2525 


321-0239-00 






RES . , FXD .FILM : 3 . OIK OHM, 12,0. 125W 


91637 


MFF1816G30100F 


R2527 


321-0201-00 






RES., FXD, FILM: 1.21K OHM , 12 ,0 . 1 25W 


91637 


MFF1816G12100F 


R2529 


321-0022-00 






RES . , FXD, FILM: 16.5 OHM , 12 , 0 . 125W 


91637 


MFF181 6G1 6R50F 


R2531 


307-0059-00 






RES . , FXD , CMPSN : 6 . 2 OHM, 52,0. 50W 


01121 


EB62G5 


R2533 


301-0271-00 






RES . , FXD , CMPSN : 270 OHM, 52,0. 50W 


01121 


EB2715 


R2535 


301-0271-00 






RES . , FXD , CMPSN : 270 OHM,52,0.50W 


01121 


EB2715 


R2550 


321-0387-00 






RES. , FXD, FILM: 105K OHM, 12 ,0. 125W 


91637 


MFF1816G10502F 


R2552 


311-1288-00 






RES. .VAR.NONWIR: 200K OHM, 10% , 0 . 50W 


32997 


3329W-L58-204 


R2553 


315-0151-00 






RES., FXD, CMPSN: 150 OHM,52,0.25W 


01121 


CB1515 


R2554 


321-0433-00 






RES. , FXD, FILM: 316K OHM, 12,0. 125W 


91637 


MFF1816G31602F 


R2556 


311-1288-00 






RES . , VAR , NONWIR : 200K OHM, 102,0. 50W 


32997 


3329W-L58-204 


R2557 


315-0151-00 






RES. , FXD, CMPSN: 150 0HM,52,0.25W 


01121 


CB1515 


R2560 


311-1288-00 






RES. , VAR, NONWIR : 200K OHM, 102 , 0 . 50W 


32997 


3329W-L58-204 


R2561 


315-0151-00 






RES. , FXD, CMPSN: 150 OBM,52,0.25W 


01121 


CB1515 


R2564 


311-1288-00 






RES. .VAR.NONWIR: 200K OHM, 102 , 0 . 50W 


32997 


3329W-L58-204 


R2565 


315-0151-00 






RES. , FXD, CMPSN: 150 0HM,52,0.25W 


01121 


CB1515 


R2568 


311-1288-00 






RES. .VAR.NONWIR: 200K OHM, 102,0. 50W 


32997 


3329W-L58-204 


R2569 


315-0151-00 






RES. , FXD, CMPSN: 150 OHM,52,0.25W 


01121 


CB1515 


R2572 


311-1288-00 






RES. .VAR.NONWIR: 200K OHM, 102 , 0 . 50W 


32997 


3329W-L58-204 


R2573 


315-0151-00 






RES. , FXD, CMPSN: 150 OHM, 52,0. 25W 


01121 


CB1515 


R2576 


311-1288-00 






RES. .VAR.NONWIR : 200R OHM , 102 ,0 . 50W 


32997 


3329W-L58-204 


R2577 


315-0151-00 






RES. , FXD, CMPSN: 150 OHM,52,0.25W 


01121 


CB1515 


R2578 


311-1288-00 






RES. .VAR.NONWIR: 200K OHM, 102,0. 50W 


32997 


3329W-L58-204 


R2579 


315-0151-00 






RES., FXD, CMPSN: 150 OHM,52,0.25W 


01121 


CB1515 


R2656 


323-0105-00 






RES . , FXD .FILM: 121 OHM, 12,0. 50W 


75042 


CECT0-1210F 


R2637 


317-0270-00 






RES . , FXD , CMPSN : 27 OHM, 52 ,0 . 1 25W 


01121 


BB2705 










(NOMINAL VALUE, SELECTED) 






R2658 


311-0605-00 






RES . .VAR.NONWIR : TRMR, 200 OHM.0.5W 


73138 


82-23-2 


R2659 


317-0270-00 






RES. , FXD ,CMPSN: 27 OHM, 52 , 0 . 125W 


01121 


BB2705 










(NOMINAL VALUE, SELECTED) 






R2660 


321-0114-00 






RES. , FXD, FILM: 150 OHM, 12,0. 125W 


91637 


MFF1816G150R0F 


R2661 


321-0114-00 






RES . , FXD , FILM: 150 OHM, 12 ,0 . 1 25W 


91637 


MFF1816G150R0F 


R2662 


321-0039-00 






RES . , FXD .FILM : 24 . 9 OHM, 12,0. 125W 


91637 


MFF1816G24R90F 


R2663 


321-0039-00 






RES . , FXD, FILM: 24 . 9 OHM , 12 ,0. 1 25W 


91637 


MFF1816G24R90F 


R2667 


315-0561-00 






RES. , FXD, CMPSN: 560 OHM,52,0.25W 


01121 


CB5615 


R2668 


315-0561-00 






RES., FXD, CMPSN: 560 OHM, 52,0. 25W 


01121 


CB5615 


R2670 


317-0047-00 






RES. , FXD ,CMPSN : 4 . 7 OHM, 52 , 0 . 125W 


01121 


BB47G5 










(NOMINAL VALUE, SELECTED) 






R2672 


317-0047-00 






RES . , FXD , CMPSN: 4 . 7 OHM, 52 , 0 . 1 25W 


01121 


BB47G5 










(NOMINAL VALUE, SELECTED) 






R2676 


317-0101-00 






RES. , FXD, CMPSN: 100 OHM , 52 ,0 . 125W 


01121 


BB1015 










(NOMINAL VALUE, SELECTED) 






R2677 


323-0069-00 






RES . ,FXD .FILM : 51 . 1 OHM, 12,0. 50W 


91637 


MFF1226G51R10F 


R2679 


323-0069-00 






RES . , FXD , FILM: 51.1 OHM.12.0.50W 


91637 


MFF1226G51R10F 


R2680 


317-0101-00 






RES. , FXD, CMPSN: 100 OHM, 52 , 0 . 125W 


01121 


BB1015 










(NOMINAL VALUE, SELECTED) 







8-90 



REV OCT 1981 





Replaceable Electrical Parts— 7844/R7844 Service 



Tektronix 
Ckt No. Part No. 


Serial/Model No, 

Eff Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Number 


R2682 


323-0121-00 






RES. ,FXD, FILM: 178 OHM,1%,0.50W 


75042 


CECT0-1780F 


R2683 


317-0131-00 






RES . , FXD, CMPSN: 1 30 OHM, 5% , 0. 125W 


01121 


BB1315 










(NOMINAL VALUE, SELECTED) 






R2685 


317-0910-00 






RES. ,FXD,CMPSN: 91 OHM, 5% , 0 . 125W 


01121 


BB9105 


R2686 


317-0910-00 






RES . , FXD , CMPSN : 91 OHM,5%,0. 125W 


01121 


BB9105 


R2687 


317-0131-00 






RES. , FXD, CMPSN: 130 OHM, 5% , 0 . 125W 


01121 


BB1315 










(NOMINAL VALUE, SELECTED) 






R2689 


323-0121-00 






RES. , FXD, FILM: 178 OHM,1%,0.50W 


75042 


CECT0-1780F 


R2690 


321-0147-00 






RES . , FXD, FILM: 332 OHM, 1%,0. 125W 


91637 


MFF1816G332R0F 


R2692 


315-0102-00 






RES., FXD, CMPSN: IK OHM,5%,0.25W 


01121 


CB1025 


R2694 


321-0155-00 






RES . , FXD, FILM: 402 OHM, 1%,0. 125W 


91637 


MFF 1 8 1 6G402 ROF 


R2696 


321-0237-00 


B010100 


B010129 


RES., FXD, FILM: 2. 87K OHM, 1%,0. 125W 


91637 


MFF1816G28700F 










(7844 ONLY) 






R2696 


321-0232-00 


B010130 




RES . , FXD .FILM: 2 . 55K OHM, 1% , 0 . 125W 


91637 


MFF1816G25500F 










(7844 ONLY) 






R2696 


321-0237-00 


B010100 


B010112 


RES . , FXD , FILM: 2 . 87K OHM, 1% ,0 . 125W 


91637 


MFF1816G28700F 










(R7844 ONLY) 






R2696 


321-0232-00 


B010113 




RES . , FXD , FILM: 2 . 55K OHM , 1% ,0 . 125W 


91637 


MFF1816G25500F 










( R7844 ONLY) 






R2700 


311-1563-00 






RES. ,VAR,N0NW1R: IK OHM, 20% ,0 . 50W 


73138 


91-85-0 


R2702 


315-0621-00 






RES . , FXD , CMPSN : 620 OHM , 5% , 0 . 25W 


01121 


CB6215 


R2710 


315-0182-00 






RES. , FXD, CMPSN : 1 . 8K OHM,5%,0.25W 


01121 


CB1825 


R2712 


315-0820-00 






RES. , FXD, CMPSN: 82 OHM,5%,0.25W 


01121 


CB8205 


R2714 


311-1567-00 






RES. ,VAR,NONWIR:TRMR, 100 OHM.0.50W 


73138 


91-89-0 


R2716 


311-1594-00 






RES. ,VAR,NONWIR: 10 OHM, 20% ,0 . 50W 


73138 


91-93-0 


R2718 


315-0100-00 






RES., FXD, CMPSN: 10 OHM,5%,0.25W 


01121 


CB1005 


R2720 


321-0079-00 






RES . , FXD .FILM: 64 . 9 OHM, 1%,0. 125W 


91637 


MFF1816G64R90F 


R2722 


321-0089-00 






RES . , FXD, FILM: 82 . 5 OHM, 1%,0. 125W 


91637 


MFF1B16G82R50F 


R2724 


321-0089-00 






RES . , FXD , F ILM : 82 . 5 OHM, 1% ,0. 125W 


91637 


MFF1816G82R50F 


R2726 


308-0736-00 






RES. , FXD, WW: 200 0HM,1%,3W 


91637 


RS2B-B200ROF 


R2730 


311-1260-00 






RES . , VAR, NONWIR: 250 OHM, 10%, 0. 50W 


32997 


3329P-L58-251 


R2732 


317-0300-00 






RES. , FXD, CMPSN: 30 OHM , 5% ,0 . 1 25W 


01121 


BB3005 


R2733 


317-0047-00 






RES. ,FXD,CMPSN:4. 7 OHM, 5% , 0 . 125W 


01121 


BB47G5 


R2734 


317-0101-00 






RES. , FXD, CMPSN: 100 OHM , 5% , 0 . 125W 


01121 


BB1015 


R2735 


323-0069-00 






RES. , FXD, FILM: 51.1 OHM,1%,0.50W 


91637 


MFF1226G51R10F 


R2736 


317-0101-00 






RES. , FXD, CMPSN: 100 OHM , 5% , 0 . 125W 


01121 


BB1015 


R2737 


323-0069-00 






RES . , FXD , FILM : 51 . 1 OHM,1%,0.50W 


91637 


MFF1226G51R10F 


R2738 


317-0101-00 






RES . , FXD , CMPSN : 100 OHM, 5% , 0 . 125W 


01121 


BB1015 


R2739 


317-0047-00 






RES . , FXD , CMPSN : 4 . 7 OHM, 5% ,0. 125W 


01121 


BB47G5 


R2741 


317-0161-00 






RES., FXD, CMPSN: 160 OHM, 5% ,0. 125W 


01121 


BB1615 


R2743 


311-1261-00 






RES. , VAR, NONWIR: 500 OHM, 10% ,0 . 50W 


32997 


3329P-L58-501 


R2745 


317-0561-00 


B010100 


B010140 


RES. , FXD, CMPSN: 560 OHM, 5% , 0 . 125W 


01121 


BB5615 










(7844 ONLY) 






R2745 


317-0431-00 


B010141 




RES . , FXD, CMPSN : 430 OHM, 5% , 0 . 1 25W 


01121 


BB4315 










(7844 ONLY) 






R2745 


317-0561-00 


B010100 


B010112 


RES. , FXD, CMPSN: 560 OHM, 5% ,0 . 1 25W 


01121 


BB5615 










(R7844 ONLY) 






R2745 


317-0431-00 


B010113 




RES. , FXD, CMPSN: 430 OHM,5%,0. 125W 


01121 


BB4315 










(R7844 ONLY) 






R2747 


317-0471-00 






RES . , FXD, CMPSN : 470 OHM, 5%,0. 125W 


01121 


BB4715 


R2749 


311-0635-00 






RES. , VAR, NONWIR: IK OHM, 10%, 0. 50W 


73138 


82-32-0 


R2753 


323-0097-00 






RES., FXD, FILM: 100 OHM,1%,0.50W 


75042 


CECTO-IOOOF 


R2754 


323-0097-00 






RES. „FXD, FILM: 100 OHM,1%,0.50W 


75042 


CECT0-1000F 


R2756 


317-0161-00 






RES. , FXD, CMPSN: 160 OHM, 5% , 0. 125W 


01121 


BB1615 


R2758 


311-1564-00 






RES . „ VAR, NONWIR : TRMR, 500 OHM.0.5W 


73138 


91-86-0 


R2760 


317-0751-00 






RES. , FXD, CMPSN: 750 OHM, 5% ,0. 125W 


01121 


BB7515 


R2762 


317-0471-00 






RES . , FXD , CMPSN : 470 OHM, 5% ,0 . 125W 


01121 


BB4715 



REV OCT 1981 



8-91 



Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Etf Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Number 


R2764 


311-1362-00 






RES . , VAR, NONWIR : 2K OHM, 20%, 0 . 50W 


73138 


91-84-0 


R2767 


323-0097-00 






RES. ,FXD.,FILM: 100 OHM,1%,0.50W 


75042 


CECT0-1000F 


R2768 


323-0097-00 






RES., FXD, FILM: 100 OHM,1%,0.50W 


75042 


CECT0-1000F 


R2770 


308-0692-00 






RES. ,FXD,WW:44 0HM,1%,3W 


91637 


RS2B44R00F 


R2771 


323-0122-00 






RES. , FXD, FILM: 182 OHM,1%,0.50W 


75042 


CECT0-1820F 










(NOMINAL VALUE, SELECTED) 






R2782A.B 


307-0292-13 






RES., FXD, FILM: 180 OHM W/PEAKING COIL 


80009 


307-0292-13 


R2783 


321-0324-00 


XB040000 




RES. , FXD ,FILM: 23 . 2K OHM, 1%,0. 125W 


91637 


MFF1816G23201F 










(7844 ONLY) 






R2783 


321-0324-00 


XB030000 




RES. , FXD .FILM: 23. 2K OHM, 1%,0. I25W 


91637 


MFF1816G23201F 










(R7844 ONLY) 






R2784 


321-0289-00 


XB040000 




RES., FXD, FILM :1 OK OHM, 1% , 0. 125W 


91637 


MFF1816G10001F 










(7844 ONLY) 






R2784 


321-0289-00 


XB030000 




RES. , FXD, FILM: 10K OHM, 1% , 0 . 1 25W 


91637 


MFF1816G10001F 










(R7844 ONLY) 






R2785 


315-0472-00 


XB040000 




RES . , FXD , CMPSN : 4 . 7K OHM,5%,0.25W 


01121 


CB4725 










(7844 ONLY) 






R2785 


315-0472-00 


XB030000 




RES., FXD, CMPSN: 4. 7K 0HM,5%,0.25W 


01121 


CB4725 










(R7844 ONLY) 






R2786 


315-0362-00 


XB040000 




RES. , FXD, CMPSN: 3. 6K 0HM,5%,0.25W 


01121 


CB3625 










(7844 ONLY) 






R2786 


315-0362-00 


XB030000 




RES., FXD, CMPSN: 3. 6K OHM,5%,0.25W 


01121 


CB3625 










( R7844 ONLY) 






R2788 


315-0103-00 


XB020000 


B039999X 


RES., FXD, CMPSN :1 OK OHM,5X,D.25W 


01121 


CB1035 










(7844 ONLY) 






R2788 


315-0103-00 


XB020000 


B029999X 


RES. , FXD, CMPSN :1 OK OHM,5%,0.25W 


01121 


CB1035 










(R7844 ONLY) 






R2790 


323-0064-00 






RES. , FXD, FILM: 45. 3 0HM,1%,0.50W 


91637 


MFF1 226G45R30F 


R2792 


323-0064-00 






RES. ,FXD,FILM:45.3 OHM,1%,0.50W 


91637 


MFF1226G45R30F 


R2795 


323-0077-00 






RES . ,FXD,FILM: 61 .9 OHM,1%,0.50W 


75042 


CECT0-61R90F 


R2796 


323-0145-00 






RES. , FXD, FILM: 316 OHM,1%,0.50W 


91637 


MFF1226G316R0F 


R2797 


321-0063-00 






RES. , FXD , FILM:44 . 2 OHM, IX, 0. 125W 


91637 


MFF1816G44R20F 


R2799 


308-0248-00 






RES., FXD, WW: 150 0HM,1X,5W 


91637 


RS2A-B1 50R0F 


R2802 


322-0167-00 


B010100 


B099999X 


RES. , FXD, FILM: 536 OHM,1X,0.25W 


91637 


MFF1421G536R0F 










(R7844 ONLY) 






R2802 


322-0167-00 


B010100 


B109999X 


RES. , FXD, FILM: 536 OHM,1X,0.25W 


91637 


MFF1421G536ROF 










(7844 ONLY) 






R2803 


321-0284-00 


B010100 


B099999X 


RES . , FXD, FILM : 8 . 87K OHM, 1X,0. 125W 


91637 


MFF1816G88700F 










(R7844 ONLY) 






R2803 


321-0284-00 


B010100 


B109999X 


RES., FXD, FILM: 8. 87K OHM, 1%,0. 125W 


91637 


MFF1816G88700F 










(7844 ONLY) 






R2804 


311-1268-00 


B010100 


B099999X 


RES., VAR, NONWIR: 10K OHM, 10% , 0 . 50W 


32997 


3329P-L58-103 










(R7844 ONLY) 






R2804 


311-1268-00 


B010100 


B109999X 


RES. , VAR, NONWIR : 10K OHM, 10% , 0 . 50W 


32997 


3329P-L58-103 










(7844 ONLY) 






R2805 


321-0284-00 


B010100 


B099999X 


RES . , FXD, FILM: 8 . 87K OHM, IX, 0. 125W 


91637 


MFF1816G88700F 










(R7844 ONLY) 






R2805 


321-0284-00 


B010100 


B109999X 


RES. , FXD, FILM: 8 . 87K OHM, 1% ,0 . 125W 


91637 


MFF1816G88700F 










(7844 ONLY) 






R2806 


322-0175-00 


B010100 


B099999X 


RES . , FXD, FILM : 649 OHM,1X,0.25W 


75042 


CEBT0-6490F 










(R7844 ONLY) 






R2806 


322-0175-00 


B010100 


B109999X 


RES. , FXD, FILM: 649 OHM,1X,0.25W 


75042 


CEBT0-6490F 










(7844 ONLY) 






R2808 


315-0222-00 


B010100 


B099999X 


RES. , FXD, CMPSN: 2. 2K OHM,5X,0.25W 


01121 


CB2225 










(R7844 ONLY) 






R2808 


315-0222-00 


B010100 


B109999X 


RES . , FXD , CMPSN : 2 . 2K OHM,5X,0.25W 


01121 


CB2225 










(7844 ONLY) 







8-92 



REV OCT 1981 





Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eff 


Dscont 


Name & Description 


R2809 


311-1260-00 


B010100 


B099999X 


RES . , VAR, NONWIR: 250 OHM, 10% ,0 . 50W 
(R7844 ONLY) 

RES . , VAR , NONWIR : 250 OHM , 1 0% , 0 . 50W 
(7844 ONLY) 

RES . , FXD, FILM: 1 . 4K OHM, 1 %, 0. 125W 
(R7844 ONLY) 


R2809 


311-1260-00 


B010100 


B109999X 


R2810 


321-0207-00 


B010100 


B099999X 










R2810 


321-0207-00 


B010100 


B109999X 


RES. , FXD, FILM: 1.4K OHM, 1% ,0. 125W 
(7844 ONLY) 

RES. ,FXD,FILM:4.22K OHM, 1%,0. 125W 
(R7844 ONLY) 

RES . , FXD , FILM : 4 . 22K OHM, 1% , 0. 125W 
(7844 ONLY) 


R2811 


321-0253-00 


B010100 


B099999X 


R2811 


321-0253-00 


B010100 


8109999X 










R2812 


321-0074-00 


B010100 


B099999X 


RES. , FXD, FILM: 57. 6 OHM , 1 % , 0 . 1 2 5W 
(R7844 ONLY) 

RES. , FXD, FILM: 57 . 6 OHM* 1% ,0 . 125W 
(7844 ONLY) 

RES . , FXD, FILM : 53 . 6 OHM, 1% , 0. 125W 
(R7844 ONLY) 


R2812 


321-0074-00 


B010100 


B109999X 


R2814 


321-00.1-00 


B010100 


B099999X 










R2814 


321-0071-00 


B010100 


B109999X 


RES. , FXD, FILM: 53. 6 OHM, 1% , 0 . 125W 
(7844 ONLY) 

RES. , FXD, FILM: 232 OHM, 1% ,0 . 125W 
(R7844 ONLY) 

RES. , FXD .FILM: 232 OHM, 1%,0. 125W 
(7844 ONLY) 


R2815 


321-0132-00 


B010100 


B099999X 


R2815 


321-0132-00 


B010100 


B109999X 










R2816 


311-1261-00 


B010100 


B099999X 


RES. , VAR, NONWIR: 500 OHM, 10%,0. 50W 
(R7844 ONLY) 

RES. , VAR, NONWIR: 500 OHM, 10% ,0 . 50W 
(7844 ONLY) 

RES. , FXD ,CMPSN: 1 . IK OHM,5%,0.25W 
(R7844 ONLY) 


R2816 


311-1261-00 


B010100 


B109999X 


R2817 


315-0112-00 


B010100 


B099999X 










R2817 


315-0112-00 


B010100 


B109999X 


RES . ,FXD , CMPSN : 1 . IK OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD , FILM : 68 . 1 OHM, 1%,0. 125W 
(R7844 ONLY) 

RES. , FXD, FILM: 68.1 OHM, 1% , 0. 125W 
(7844 ONLY) 


R2818 


321-0081-00 


B010100 


B099999X 


R2818 


321-0081-00 


B010100 


B109999X 










R2819 


321-0081-00 


B010100 


B099999X 


RES. , FXD .FILM: 68. 1 OHM, 1%,0. 125W 
(R7844 ONLY) 

RES. ,FXD,FILM:68. 1 OHM , 1% ,0 . 125W 
(7844 ONLY) 

RES. , FXD, CMPSN: 270 OHM,5%,0.25W 
(R7844 ONLY) 


R2819 


321-0081-00 


B010100 


B109999X 


R2820 


315-0271-00 


B010100 


B099999X 










R2820 


315-0271-00 


B010100 


B109999X 


RES. , FXD, CMPSN: 270 OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 270 OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 2 70 0HM,5%,0.25W 
(7844 ONLY) 


R2822 


315-0271-00 


B010100 


B099999X 


R2822 


315-0271-00 


B010100 


B109999X 










R2824 


321-0228-00 


B010100 


B099999X 


RES . , FXD , FILM: 2 . 32K OHM , 1% , 0 . 1 25W 
(R7844 ONLY) 

RES . , FXD , FILM: 2 . 32K OHM,1%,0.125W 
(7844 ONLY) 

RES. , FXD, FILM: 1 1 . 5K OHM, 1% , 0. 125W 
(R7844 ONLY) 


R2824 


321-0228-00 


B010100 


B109999X 


R2825 


321-0295-00 


B010100 


B099999X 










R2825 


321-0295-00 


B010100 


B109999X 


RES. , FXD, FILM: 11 . 5K OHM, 1% ,0 . 125W 
(7844 ONLY) 

RES. , FXD, CMPSN: 6. 8K OHM,5%,0.25W 


R2826 


315-0682-00 


BO 10100 


B099999X 



(R7844 ONLY) 



Mfr 

Code Mfr Part Number 



32997 


3329P-L58-251 


32997 


3329P-L58-251 


91637 


MFF1816G14000F 


91637 


MFF181 6G14000F 


91637 


MFF1816G42200F 


91637 


MFF1816G42200F 


91637 


MFF181 6G57R60F 


91637 


MFF1816G57R60F 


91637 


MFF181 6G53R60F 


91637 


MFF1816G53R60F 


91637 


MFF1816G232R0F 


91637 


MFF1 81 6G232R0F 


32997 


3329P-L58-501 


32997 


3329P-L58-501 


01121 


CB1125 


01121 


CB1125 


91637 


MFF1816G68R10F 


91637 


MFF1816G68R10F 


91637 


MFF1816G68R10F 


91637 


MFF1816G68R10F 


01121 


CB2715 


01121 


CB2715 


01121 


CB2715 


01121 


CB2715 


91637 


MFF1816G23200F 


91637 


MFF1816G23200F 


91637 


MFF1816G11501F 


91637 


MFF1816G11501F 


01121 


CB6825 



REV OCT 1981 



8-93 




Replaceable Electrical Parts— 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No, 


Part No. 


Eff 


Dscont 


R2826 


315-0682-00 


B010100 


B109999X 


R2828 


322-0161-00 


B010100 


B099999X 


R2828 


322-0161-00 


B010100 


B109999X 


R2829 


321-0248-00 


B010100 


B099999X 


R2829 


321-0248-00 


B010100 


B109999X 


R2830 


321-0202-00 


B010100 


B099999X 


R2830 


321-0202-00 


B010100 


B109999X 


R2831 


315-0470-00 


XB030190 


B109999X 


R2831 


315-0470-00 


XB020123 


B099999X 


R2832 


322-0216-00 


B010100 


B099999X 


R2832 


322-0216-00 


B010100 


B109999X 


R2834 


321-0176-00 


B010100 


B099999X 


R2834 


321-0176-00 


B010100 


B109999X 


R2836 


321-0176-00 


B010100 


B099999X 


R2836 


321-0176-00 


B010100 


B109999X 


R2837 


321-0235-00 


B010100 


B099999X 


R2837 


321-0235-00 


B010100 


B109999X 


R2838 


311-1261-00 


B010100 


B099999X 


R2838 


311-1261-00 


B010100 


B109999X 


R2839 


321-0235-00 


B010100 


B099999X 


R2839 


321-0235-00 


B010100 


B109999X 


R2840 


315-0153-00 


B010100 


B099999X 


R2840 


315-0153-00 


BO 10100 


B109999X 


R2842 


315-0751-00 


B010100 


B099999X 


R2842 


315-0751-00 


B010100 


B109999X 


R2844 


321-0204-00 


B010100 


B099999X 


R2844 


321-0204-00 


B010100 


B109999X 


R2845 


315-0362-00 


B010100 


B099999X 



Name & Description 



RES. ,FXD,CMPSN:6.8K OHM,5%,0.25W 
(7844 ONLY) 

RES . ,FXEi , FILM: 464 OHM,1%,0.25W 
(R7844 ONLY) 

RES. ,FXD, FILM: 464 OHM,1%,0.25W 
(7844 ONLY) 

RES . ,FXD ,FILM: 3 . 74K OHM, 1% , 0 . 1 25W 
(R7844 ONLY) 

RES. ,FXD,FILM: 3. 74K OHM, 1% ,0 . 125W 
(7844 ONLY) 

RES., FXD, FILM :1.24K OHM, 1%,0. 125W 
(R7844 ONLY) 

RES., FXI), FILM :1.24K OHM, 1%,0. 125W 
(7844 ONLY) 

RES. ,FXI),CMPSN:47 OHM,5%,0.25W 
(R7844 ONLY) 

RES . ,FXI),CMPSN:47 OHM, 52 , 0 . 25W 
(7844 ONLY) 

RES., FXI), FILM: 1.74K OHM,1%,0.25W 
(R7844 ONLY) 

RES. , FXI), FILM: 1.74K OHM,1%,0.25W 
(7844 ONLY) 

RES. , FXI), FILM: 665 OHM, 12,0. 125K 
(R7844 ONLY) 

RES . , FXD, FILM: 665 OHM, 12,0. 125W 
(7844 ONLY) 

RES. , FXD, FILM: 665 OHM, 12,0. 125W 
(R7844 ONLY) 

RES. , FXD, FILM: 665 OHM, 12,0. 125W 
(7844 ONLY) 

RES . , FXD, FILM: 2 . 74K OHM, 12 ,0 . 1 25W 
( R7844 ONLY) 

RES . , FXD .FILM: 2 . 74K OHM, 12,0. 125W 
(7844 ONLY) 

RES . ,VAR,NONWIR: 500 OHM, 102 , 0 . 50W 
(R7844 ONLY) 

RES. ,VAR,NONWIR: 500 OHM, 102 ,0 . 50W 
(7844 ONLY) 

RES., FXD, FILM: 2. 74K OHM, 12 , 0. 125W 
(R7844 ONLY) 

RES . , FXD , FILM : 2 . 74K OHM , 1 2 , 0 . 1 25W 
(7844 ONLY) 

RES . ,FXD,CMPSN : 15K OHM,52,0.25W 
( R7844 ONLY) 

RES. ,FXD,CMPSN: 15K OHM,52,0.25W 
(7844 ONLY) 

RES . ,FXD,CMPSN : 750 OHM.52.0.25W 
(7844 ONLY) 

RES . ,FXD ,CMPSN : 750 OHM,52,0.25W 
(R7844 ONLY) 

RES., FXD, FILM: 1.3K OHM, 12,0 . 125W 
(7844 ONLY) 

RES. , FXD, FILM: 1 . 3K OHM, 12 , 0 . 125W 
( R7844 ONLY) 

RES . , FXD.CMPSN : 3 . 6K OHM, 52,0. 25W 
( R7844 ONLY) 



Mfr 

Code Mir Part Number 



01121 


CB6825 


75042 


CEBT0-4640F 


75042 


CEBT0-4640F 


91637 


MFF1816G37400F 


91637 


MFF1816G37400F 


91637 


MFF1816G12400F 


91637 


MFF1816G12400F 


01121 


CB4705 


01121 


CB4705 


75042 


CEBT0-1741F 


75042 


CEBTO-l 741F 


91637 


MFF1816G665R0F 


91637 


MFF1816G665R0F 


91637 


MFF1816G665R0F 


91637 


MFF1816G665R0F 


91637 


MFF1816G27400F 


91637 


MFF1816G27400F 


32997 


3329P-L58-501 


32997 


3329P-L58-501 


91637 


MFF1816G27400F 


91637 


MFF1816G27400F 


01121 


CB1535 


01121 


CB1535 


01121 


CB7515 


01121 


CB7515 


91637 


MFF1816G13000F 


91637 


MFF1 81 6G1 3000F 


01121 


CB3625 



8-94 



REV OCT 1981 





Replaceable Electrical Parts— 7844/R7844 Service 



Tektronix Serial/Model No. 
Ckt No. Part No. Eff Dscont 



R2845 


315-0362-00 


B010100 


B109999X 


R2846 


308-0230-00 


B010100 


B099999X 


R2846 


308-0230-00 


B010100 


B109999X 


R2848 


315-0470-00 


B010100 


B099999X 


R2848 


315-0470-00 


B010100 


B109999X 


R2850 


315-0153-00 


B010100 


B099999X 


R2850 


315-0153-00 


B010100 


B109999X 


R2852 


315-0751-00 


B010100 


B099999X 


R2852 


315-0751-00 


B010100 


B109999X 


R2854 


321-0204-00 


B010100 


B099999X 


R2854 


321-0204-00 


B010100 


B109999X 


R2855 


315-0362-00 


B010100 


B099999X 


R2855 


315-0362-00 


B010100 


B109999X 


R2856 


308-0230-00 


B010100 


B099999X 


R2856 


308-0230-00 


B010100 


B109999X 


R2858 


315-0470-00 


B010100 


B099999X 


R2858 


315-0470-00 


B010100 


B109999X 


R2860 


311-1258-00 


B010100 


B099999X 


R2860 


311-1258-00 


B010100 


B109999X 


R2861 


301-0822-00 


B010100 


B099999X 


R2861 


301-0822-00 


B010100 


B109999X 


R2864 


317-0680-00 


B010100 


B099999X 


R2864 


317-0680-00 


B010100 


B109999X 


R2866 


315-0103-00 


B010100 


B099999X 


R2866 


315-0103-00 


B010100 


B109999X 


R2867 


315-0201-00 


B010100 


B099999X 


R2867 


315-0201-00 


B010100 


B109999X 


R2868 


301-0821-00 


B010100 


B099999X 



Name & Description 


Mfr 

Code 


Mfr Part Number 


RES. , FXD ,CMPSN: 3 . 6K OHM,5X,0.25W 
(7844 ONLY) 


01121 


CB3625 


RES. ,FXD,WW:2.7K OHM,5%,3W 
(R7844 ONLY) 


91637 


RS2B-B27000J 


RES . , FXD , WW: 2 . 7K OHM,5X,3W 
(7844 ONLY) 


91637 


RS2B-B27000J 


RES . , FXD ,CMPSN : 47 OHM,5X,0.25W 
(R7844 ONLY) 


01121 


CB4705 


RES . , FXD, CMPSN : 47 OHM,5X,0.25W 
(7844 ONLY) 


01121 


CB4705 


RES . , FXD , CMPSN : 15K 0HM,5X,0.25W 
(R7844 ONLY) 


01121 


CB1535 


RES . , FXD, CMPSN : 15K OHM,5%,0.25W 
(7844 ONLY) 


01121 


CB1535 


RES . , FXD , CMPSN : 7 50 OHM,5X,0.25W 
(R7844 ONLY) 


01121 


CB7515 


RES. , FXD, CMPSN: 750 0HM,5X,0.25W 
(7844 ONLY) 


01121 


CB7515 


RES. , FXD, FILM: 1.3K OHM, 1%,0. 125W 
(R7844 ONLY) 


91637 


MFF1816G13000F 


RES . , FXD, FILM: 1 . 3K OHM, 1X,0. 125W 
(7844 ONLY) 


91637 


MFF1816G13000F 


RES. , FXD, CMPSN: 3. 6K OHM,5X,0.25W 
(R7844 ONLY) 


01121 


CB3625 


RES. , FXD, CMPSN: 3. 6K OHM,5X,0.25W 
(7844 ONLY) 


01121 


CB3625 


RES. ,FXD,WW:2.7K OHM,5%,3W 
(R7844 ONLY) 


91637 


RS2B-B27000J 


RES. ,FXD,WW:2.7K OHM,5X,3W 
(7844 ONLY) 


91637 


RS2B-B27000J 


RES. , FXD, CMPSN :47 OHM,5%,0.25W 
(R7844 ONLY) 


01121 


CB4705 


RES. , FXD, CMPSN: 47 OHM,5X,0.25W 
(7844 ONLY) 


01121 


CB4705 


RES . ,VAR,NONWIR: 50 OHM, 10X , 0 . 50W 
(R7844 ONLY) 


32997 


3329P-L58-500 


RES . , VAR, NONWIR: 50 OHM, 10X.0.50W 
(7844 ONLY) 


32997 


3329P-L58-500 


RES. , FXD, CMPSN: 8. 2K OHM, 5X ,0. 50W 
(R7844 ONLY) 


01121 


EB8225 


RES. ,FXD,CMPSN: 8 . 2K 0HM,5X,0.50W 
(7844 ONLY) 


01121 


EB8225 


RES. ,FXD,CMPSN:68 OHM , 5% ,0 . 125W 
(R7844 ONLY) 

(NOMINAL VALUE, SELECTED) 


01121 


BB6805 


RES. , FXD, CMPSN: 68 OHM, 5% , 0 . 125W 
(7844 ONLY) 

(NOMINAL VALUE, SELECTED) 


01121 


BB6805 


RES., FXD, CMPSN :1 OK OHM,5X,0.25W 
(R7844 ONLY) 


01121 


CB1035 


RES., FXD, CMPSN :1 OK 0HM,5X,0.25W 
(7844 ONLY) 


01121 


CB1035 


RES. , FXD, CMPSN: 200 OHM,5X,0.25W 
(R7844 ONLY) 


01121 


CB2015 


RES. , FXD, CMPSN: 200 OHM,5X,0.25W 
(7844 ONLY) 


01121 


CB2015 


RES . , FXD .CMPSN : 820 OHM,5X,0.50W 

(R7B44 ONLY) 


01121 


EB8215 



REV OCT 1981 



8-95 





Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eff Dscont 


R2868 


301-0821-00 


B010100 


B109999X 


R2870 


311-1258-00 


B010100 


B099999X 


R2870 


311-1258-00 


B010100 


B109999X 


R2871 


301-0822-00 


B010100 


B099999X 


R2871 


301-0822-00 


B010100 


B109999X 


R2872 


315-0751-00 


B010100 


B099999X 


R2872 


315-0751-00 


B010100 


B109999X 


R2873 


311-1265-00 


B010100 


B099999X 


R2873 


311-1265-00 


BO 10 100 


B109999X 


R2874 


315-0821-00 


B010100 


B099999X 


R2874 


315-0821-00 


B010100 


B109999X 


R2878 


315-0162-00 


B010100 


B099999X 


R2878 


315-0162-00 


B010100 


B109999X 


R2880 


317-0680-00 


B010100 


B099999X 


R2880 


317-0680-00 


B010100 


B109999X 


R2882 


315-0103-00 


B010100 


B099999X 


R2882 


315-0103-00 


B010100 


B109999X 


R2884 


315-0102-00 


B010100 


B099999X 


R2884 


315-0102-00 


B010100 


B109999X 


R2886 


315-0512-00 


B010100 


B099999X 


R2886 


315-0512-00 


B010100 


B109999X 


R2890 


323-0321-00 


B010100 


B099999X 


R2890 


323-0321-00 


B010100 


B109999X 


R2892 


321-0244-00 


B010100 


B099999X 


R2892 


321-0244-00 


B010100 


B109999X 


R2894 


315-0182-00 


B010100 


B099999X 


R2894 


315-0182-00 


B010100 


B 109999X 



Name & Description 



RES. , FXD, CMPSN: 820 OHM,5%,0.50W 
(7844 ONLY) 

RES . , VAR,H0NW1R: 50 OHM, 10% , 0 . 50W 
(R7844 ONLY) 

RES. ,VAR,NONWIR: 50 OHM, 10% , 0 . 50W 
(7844 ONLY) 



RES . , FXD , CMPSN : 8 . 2K OHM , 5% , 0 . 50W 
( R7844 ONLY) 

RES., FXD, CMPSN: 8. 2K OHM,5%,0.50W 
(7844 ONLY) 

RES . , FXD, CMPSN : 750 OHM,5%,0.25W 
(R7844 ONLY) 

RES., FXD, CMPSN: 7 50 0HM,5%,0.25W 
(7844 ONLY) 

RES . , VAR, WONWIR : 2K OHM, 10%,0. 50W 
(R7844 ONLY ) 

RES. ,VAR,NONWXR: 2K OHM, 10% , 0 . 50W 
(7844 ONLY) 



RES. , FXD, CMPSN: 820 OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD, CMPSN : 820 OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN : 1 . 6K OHM,5%,0.25W 
(R7844 ONLY) 



RES., FXD, CMPSN : 1 . 6K 0HM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 68 OHM, 5% , 0. 125W 
(R7844 ONLY) 

(NOMINAL VALUE, SELECTED) 

RES. , FXD, CMPSN: 68 OHM,5%,0. 125W 
(7844 ONLY) 

(NOMINAL VALUE, SELECTED) 



RES., FXD, CMPSN: 10K OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN : 10K OHM,5%,0.25W 
(7844 ONLY) 

RES., FXD, CMPSN: IK OHM,5%,0.25W 
( R7844 ONLY) 



RES., FXD, CMPSN: IK OHM,5%,0.25W 
(7844 ONLY) 

RES . , FXD , CMPSN : 5 . 1 K OHM,5%,0.25W 
(R7844 ONLY) 

RES., FXD, CMPSN: 5. IK OHM,5%,0.25W 
(7844 ONLY) 

RES . , FXD , FILM: 21 . 5K OHM,1%,0.50W 
(R7844 ONLY) 

RES . , FXD .FILM: 21 . 5K 0HM,1%,0.50W 
(7844 ONLY) 

RES., FXD, FILM: 3. 4K OHM, 1% ,0 . 125W 
(R7844 ONLY) 

RES. , FXD, FILM: 3.4K OHM, 1% , 0 . 125W 
(7844 ONLY) 

RES . , FXD , CMPSN : 1 . 8K OHM,5%,0.25W 
(R7844 ONLY) 

RES., FXD, CMPSN : 1 . 8K OHM,5%,0.25W 
(7844 ONLY) 



Mfr 

Code Mfr Part Number 

01121 EB8215 

32997 3329P-L58-500 

32997 3329P-L58-500 

01121 EB8225 

01121 EB8225 

01121 CB7515 

01121 CB7515 

32997 3329P-L58-202 

32997 3329P-L58-202 

01121 CB8215 

01121 CB8215 

01121 CB1625 

01121 CB1625 

01121 BB6805 

01121 BB6805 

01121 CB1035 

01121 CB1035 

01121 CB1025 

01121 CB1025 

01121 CB5125 

01121 CB5125 

75042 CECTO-21 52F 
75042 CECT0-2152F 

91637 MFF1816G34000F 

91637 MFF1816G34000F 

01121 CB1825 

01121 CB1825 



8-96 



REV OCT 1981 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eft 


Dscont 


R2895 


301-0623-00 


B010100 


B099999X 


R2895 


301-0623-00 


B010100 


B109999X 


R2896 


315-0390-00 


B010100 


B099999X 


R2896 


315-0390-00 


B010100 


B109999X 


R2898 


323-0364-00 


B010100 


B099999X 


R2898 


323-0364-00 


B010100 


B109999X 


R2903 


301-0102-00 


B010100 


B099999X 


R2903 


301-0102-00 


B010100 


B109999X 


R2904 


321-0509-00 


B010100 


B099999X 


R2904 


321-0309-00 


B010100 


B109999X 


R2906 


321-0268-00 


B010100 


B099999X 


R2906 


321-0268-00 


B010100 


B109999X 


R2907 


321-0307-00 


B010100 


B099999X 


R2907 


321-0307-00 


B010100 


B109999X 


R2920 


323-0321-00 


B010100 


B099999X 


R2920 


323-0321-00 


B010100 


B109999X 


R2922 


321-0244-00 


B010100 


B099999X 


R2922 


321-0244-00 


B010100 


B109999X 


R2924 


315-0182-00 


B010100 


B099999X 


R2924 


315-0182-00 


B010100 


B109999X 


R2925 


301-0623-00 


B010100 


B099999X 


R2925 


301-0623-00 


B010100 


B109999X 


R2926 


315-0390-00 


B010100 


B099999X 


R2926 


315-0390-00 


B010100 


B109999X 


R2927 


315-0122-00 


B010100 


B099999X 


R2927 


315-0122-00 


B010100 


B109999X 


R2928 


323-0364-00 


B010100 


B099999X 


R2928 


323-0364-00 


B010100 


B109999X 


R2934 


321-0309-00 


B010100 


B099999X 



Name & Description 



RES . , FXD, CMPSN : 62K OHM,5Z,D.50W 
(R7844 ONLY) 

RES . ,FXD ,CMPSN : 62K OHM,5%,0.50W 
(7844 ONLY) 

RES . ,FXD,CMPSN : 39 OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD , CMPSN : 39 0HM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, FILM: 60. 4K OHM,1%,0.50W 
(R7844 ONLY) 

RES. , FXD, FILM: 60. 4K OHM,1%,0.50W 
(7844 ONLY) 

RES. , FXD, CMPSN: IK OHM,5%,0.50W 
(R7844 ONLY) 

RES., FXD, CMPSN: IK OHM, 5%, 0 . 50W 
(7844 ONLY) 

RES., FXD, FILM: 16. 2K OHM,1%,0.125W 
( R7844 ONLY) 

RES. FXD, FILM: 16. 2K OHM, IX , 0 . 1 25W 
(7844 ONLY) 

RES . ,, FXD .FILM: 6 . 04K OHM, IX , 0 . 125W 
( R7844 ONLY) 

RES., .FXD, FILM: 6. 04K OHM, 1%,0. 125W 
(7844 ONLY) 

RES., , FXD, FILM: 15. 4K OHM, 1% , 0 . 125W 
(R7844 ONLY) 

RES.., FXD, FILM: 15. 4K OHM, 1% ,0 . 125W 
(7844 ONLY) 

RES. FXD, FILM: 21 . 5K OHM, 1X.0.50W 
(R78'*4 ONLY) 

RES. , FXD, FILM: 21. 5K OHM,1X,0.50W 
(7844 ONLY) 

RES. „ FXD, FILM: 3. 4K OHM, 1% ,0 . 125W 
(R7844 ONLY) 

RES . , FXD .FILM: 3 . 4K OHM, IX , 0 . 125W 
(7844 ONLY) 

RES. , FXD, CMPSN : 1 . 8K OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN :1.8K 0HM,5X,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN :62K OHM, 5% , 0 . 50W 
( R7844 ONLY) 

RES. , FXD, CMPSN :62K OHM, 5X, 0 . 50W 
(7844 ONLY) 

RES . , FXD, CMPSN : 39 OHM, 5% , 0 . 25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 39 OHM,5X,0.25W 
(7844 ONLY) 

RES., FXD, CMPSN :1.2K OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD .CMPSN : 1 . 2K OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, FILM : 60 .4K OHM,1%,0.50W 
(R7844 ONLY) 

RES . , FXD, FILM: 60 .4K OHM,1X,0.50W 
(7844 ONLY) 

RES. , FXD, FILM: 16. 2K OHM, 1%,0.125W 
(R7844 ONLY) 



Mfr 

Code Mfr Part Number 



01121 


EB6235 


01121 


EB6235 


01121 


CB3905 


01121 


CB3905 


91637 


MFF1226G60401F 


91637 


MFF1226G60401F 


01121 


EB1025 


01121 


EB1025 


91637 


MFF1816G16201F 


91637 


MFF1816G16201F 


91637 


MFF1816G60400F 


91637 


MFF1816G60400F 


91637 


MFF181 6G1 5401 F 


91637 


MFF1816G15401F 


75042 


CECT0-2 1 52F 


75042 


CECT0-2152F 


91637 


MFF1816G34000F 


91637 


MFF1816G34000F 


01121 


CB1825 


01121 


CB1825 


01121 


EB6235 


01121 


EB6235 


01121 


CB3905 


01121 


CB3905 


01121 


CB1225 


01121 


CB1225 


91637 


MFF1226G60401F 


91637 


MFF1226G60401F 


91637 


MFF1816G16201F 



REV OCT 1981 



8-97 



Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Modei No. 



Ckt No. 


Part No. 


Eff 


Dscont 


R2934 


321-0309-00 


B010100 


B109999X 


R2936 


321-0268-00 


8010100 


B099999X 


R2936 


321-0268-00 


B010100 


B109999X 


R2937 


321-0331-00 


B010100 


B099999X 


R2937 


321-0331-00 


B010100 


B109999X 


R2940 


311-1268-00 


B010100 


B099999X 


R2940 


311-1268-00 


B010100 


B109999X 


R2976 


311-1274-00 


B010100 


B099999X 


R2976 


311-1274-00 


B010100 


B109999X 


R2977 


315-0680-00 


B010100 


B099999X 


R2977 


315-0680-00 


B010100 


B109999X 


R2980 


315-0270-00 


B010100 


B099999X 


R2980 


315-0270-00 


B010100 


B109999X 


R2983 


315-0680-00 


B010100 


B099999X 


R2983 


315-0680-00 


BOIOIOO 


B109999X 


R2984 


315-0104-00 


B010100 


B099999X 


R2984 


315-0104-00 


BOIOIOO 


B109999X 


R2985 


311-1274-00 


BOIOIOO 


B099999X 


R2985 


311-1274-00 


BOIOIOO 


B109999X 


R2986 


307-0103-00 


BOIOIOO 


B099999X 


R2986 


307-0103-00 


BOIOIOO 


B109999X 


R2987 


315-0104-00 


BOIOIOO 


B099999X 


R2987 


315-0104-00 


BOIOIOO 


B109999X 


R2988 


311-1274-00 


BOIOIOO 


B099999X 


R2988 


311-1274-00 


BOIOIOO 


B109999X 


R2989 


315-0390-00 


BOIOIOO 


B099999X 


R2989 


315-0390-00 


BOIOIOO 


B109999X 


R2995 


315-0390-00 


BOIOIOO 


B099999X 



Name & Description 



RES. , FXD, FILM : 16 . 2K OHM, 1% ,0. 125W 
(7844 ONLY) 

RES . , FXD ,FILM: 6 . 04K OHM, 1% , 0 . 125W 
(R7844 ONLY) 

RES., FXD, FILM: 6. 04K OHM, 1%,0. 125W 
(7844 ONLY) 

RES., FXD, FILM: 27. 4K OHM , 1 % , 0 . 1 2 5W 
(R7844 ONLY) 

RES. , FXD, FILM: 27. 4K OHM, 1%,0. 125W 
(7844 ONLY) 

RES. ,VAR,NONWIR: IOK OHM, 10% ,0 . 50W 
(R7844 ONLY) 

RES., VAR , NONWIR : 1 OK OHM, 10% ,0 . 50W 
(7844 ONLY) 

RES . , VAR, NONWIR: 500K OHM, 10%, 0. 50W 
(R7844 ONLY) 

RES . , VAR , NONWIR : 500K OHM , 10%, 0 . SOW 
(7844 ONLY) 

RES . ,FXD,CMPSN : 68 OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD,CMPSN : 68 OHM,5%,0.25W 
(7844 ONLY) 

RES . , FXD,CMPSN : 27 OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD .CMPSN: 27 OHM,5%,0.25W 
(7844 ONLY) 

RES., FXD, CMPSN: 68 OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD, CMPSN : 68 OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 100K OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 100K OHM,5%,0.25W 
(7844 ONLY) 

RES . , VAR , NONWIR : 500K OHM , 10% , 0. SOW 
( R7844 ONLY) 

RES., VAR, NONWIR : 500K OHM, 10% , 0. SOW 
(7844 ONLY) 

RES . , FXD, CMPSN : 2 . 7 OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD , CMPSN : 2 . 7 0HM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 100K OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD , CMPSN : 1 OOK OHM , 5% , 0 . 2 5W 
(7844 ONLY) 

RES . , VAR, NONWIR: 500K OHM, 10%, 0. 50W 
(R7844 ONLY) 

RES . , VAR, NONWI R : 500K OHM, 10%, 0. 50W 
(7844 ONLY) 

RES., FXD, CMPSN: 39 0HM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 39 0HM,5%,0.25W 
(7844 ONLY) 

RES . , FXD , CMPSN : 39 OHM,5%,0.25W 
(R7844 ONLY) 



Mfr 

Code Mfr Part Number 



91637 


MFF1816G16201F 


91637 


MFF1816G60400F 


91637 


MFF1816G60400F 


91637 


MFF1816G27401F 


91637 


MFF1816G27401F 


32997 


3329P-L58-103 


32997 


3329P-L58-103 


32997 


3329P-L58-504 


32997 


3329P-L58-504 


01121 


CB6805 


01121 


CB6805 


01121 


CB2705 


01121 


CB2705 


01121 


CB6805 


01121 


CB6805 


01121 


CB1045 


01121 


CB1045 


32997 


3329P-L58-504 


32997 


3329P-L58-504 


01121 


CB27G5 


01121 


CB27G5 


01121 


CB1045 


01121 


CB1045 


32997 


3329P-L58-504 


32997 


3329P-L58-504 


01121 


CB3905 


01121 


CB3905 


01121 


CB3905 



8-98 



REV OCT 1981 




Replaceable Electrical Parts — 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eff Dscont 


Name & Description 


Mfr 

Code 


Mtr Part Number 


R2995 


315-0390-00 


B010100 


B109999X 


RES . , FXD , CMPSN : 39 OHM,5%,0.25W 


01121 


CB3905 










(7844 ONLY) 






R2997 


315-0390-00 


B010100 


B099999X 


RES., FXD, CMPSN: 39 OHM,5%,0.25W 


01121 


CB3905 










(R7844 ONLY) 






R2997 


315-0390-00 


B010100 


B109999X 


RES. , FXD, CMPSN: 39 OHM.5Z.0.25W 


01121 


CB3905 










(7844 ONLY) 






R3151 


321-0191-00 






RES . , FXD, FILM : 953 OHM, 1%,0. 125W 


91637 


MFF1816G953R0F 


R3152 


315-0682-00 






RES. , FXD, CMPSN: 6. 8K OHM,5Z,0.25W 


01121 


CB6825 


R3153 


315-0202-00 






RES. , FXD, CMPSN :2K 0HM,5Z,0.25W 


01121 


CB2025 


R3154 


315-0102-00 






RES. , FXD, CMPSN: IK OHM, 5% , 0. 25W 


01121 


CB1025 


R3156 


315-0103-00 






RES. , FXD, CMPSN: 10K OHM,5%,0.25W 


01121 


CB1035 


R3157 


315-0103-00 






RES., FXD, CMPSN: 10K OHM, 5% , 0. 25W 


01121 


CB1035 


R3158 


315-0102-00 






RES. , FXD, CMPSN: IK OHM,5%,0.25W 


01121 


CB1025 


R3160 


315-0103-00 






RES. , FXD, CMPSN: 10K OHM,5%,0.25W 


01121 


CB1035 


R3161 


315-0472-00 






RES., FXD, CMPSN: 4. 7K OHM,5Z,0.25W 


01121 


CB4725 


R3162 


315-0512-00 






RES. , FXD, CMPSN: 5. IK OHM,5Z,0.25W 


01121 


CB5125 


R3163 


321-0191-00 






RES. , FXD, FILM: 953 OHM,U,0.125W 


91637 


MFF1816G953R0F 


R3164 


315-0682-00 






RES. , FXD, CMPSN: 6. 8K OHM,5%,0.25W 


01121 


CB6825 


R3165 


315-0202-00 






RES. , FXD, CMPSN :2K OHM,5%,0.25W 


01121 


CB2025 


R3166 


315-0102-00 






RES., FXD, CMPSN: IK OHM,5Z,0.25W 


01121 


CB1025 


R3168 


315-0103-00 






RES. , FXD, CMPSN : 10K OHM,5%,0.25W 


01121 


CB1035 


R3169 


315-0103-00 






RES. , FXD, CMPSN: 10K OHM,5%,0.25W 


01121 


CB1035 


R3170 


315-0102-00 






RES. , FXD, CMPSN: IK OHM,5%,0.25W 


01121 


CB1025 


R3172 


315-0103-00 






RES. , FXD, CMPSN :1 OK OHM,5%,0.25W 


01121 


CB1035 


R3173 


315-0472-00 






RES. , FXD, CMPSN: 4. 7K OHM,5Z,0.25W 


01121 


CB4725 


R3174 


315-0512-00 






RES. .FXD, CMPSN: 5. IK OHM,5Z,0.25W 


01121 


CB5125 


R3177 


315-0392-00 






RES. , FXD, CMPSN: 3. 9K OHM,5%,0.25W 


01121 


CB3925 


R3179 


315-0392-00 






RES. , FXD, CMPSN: 3. 9K 0HM,5%,0.25W 


01121 


CB3925 


R3180 


315-0511-00 






RES. , FXD, CMPSN: 510 0HM.5Z.0.25W 


01121 


CB5115 


R3182 


315-0562-00 






RES. , FXD, CMPSN: 5. 6K OHM,5Z,0.25W 


01121 


CB5625 


R3184 


315-0302-00 






RES. , FXD, CMPSN :3K OHM,5Z,0.25W 


01121 


CB3025 


R3185 


311-1373-00 






RES . , VAR , NONWIR : 5K OHM,20Z,1W 


01121 


7 3U4G040L502M 


R3186 


315-0302-00 






RES. , FXD, CMPSN :3K OHM,5%,0.25W 


01121 


CB3025 


R3187 


321-0182-00 






RES . ,FXD , FILM: 768 OHM, 1% ,0 . 125W 


91637 


MFF1816G768R0F 


R3188 


321-0274-00 






RES. , FXD , FILM: 6 . 98K OHM , 1% , 0 . 125W 


91637 


MFF1816G69800F 


R3189 


311-1373-00 






RES . , VAR , NONWIR: 5K OHM,20Z,1W 


01121 


73U4G040L502M 


R3190 


315-0271-00 






RES. , FXD, CMPSN: 2 70 OHM,5Z,0.25W 


01121 


CB2715 


R3191 


315-0271-00 






RES . , FXD , CMPSN : 270 0HM,5Z,0.25W 


01121 


CB2715 


R3193 


311-1592-00 






RES . , VAR, NONWIR: 2 . 5K OHM X 1M OHM,20%,0. 50W 


01121 


14M414 










(7844 ONLY.FURN AS A UNIT WITH R3195) 






R3193 


311-0994-00 






RES. , VAR, NONWIR: 2. 5K OHM, 10Z.0. 50W 


01121 


WA1G048S252UA 










(R7844 ONLY) 






R3194 


311-1592-00 






RES . , VAR, NONWIR: 2 . 5K OHM X 1M OHM, 20Z , 0 . 50W 


01121 


14M414 










(7844 ONLY.FURN AS A UNIT WITH R3196) 






R3194 


311-0994-00 






RES. , VAR, NONWIR: 2. 5K OHM, 10% , 0 . 50W 


01121 


WA1G048S252UA 










(R7844 ONLY) 






R3195 


311-1592-00 






RES. , VAR, NONWIR: 2. 5K OHM X 1M OHM, 20%, 0. 50W 


01121 


14M414 










(7844 ONLY.FURN AS A UNIT WITH R3193) 






R3195 


311-0382-00 






RES., VAR, NONWIR :1M OHM, 20% 


11237 


300SF-41 1 58 










( R7844 ONLY) 






R3196 


311-1592-00 






RES . , VAR, NONWIR : 2 . 5K OHM X 1M OHM, 20% ,0 . 50W 


01121 


14M414 










(7844 ONLY.FURN AS A UNIT WITH R3194) 






R3196 


311-0382-00 






RES. , VAR, NONWIR : 1M OHM, 20% 


11237 


300SF-41158 










(R7844 ONLY) 






R3198 


315-0271-00 






RES. , FXD, CMPSN: 270 OHM,5Z,0.25W 


01121 


CB2715 


R3199 


315-0271-00 






RES. , FXD, CMPSN: 2 70 OHM,5Z,0.25W 


01121 


CB2715 


R3601 


321-1647-07 






RES . , FXD, FILM: 51 .4K OHM,0. 1Z,0. 125W 


91637 


MFF1816C51R40B 



REV OCT 1981 



8-99 



Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eff 


Dscont 


R3604 


321-0138-00 






R3605 


321-0138-00 






R3611 


321-1647-07 






R3614 


321-0140-00 






R3615 


325-0053-00 






R3616 


325-0053-00 






R3617 


321-0140-00 






R3618 


317-0161-00 


B010100 


B049999 


R3618 


317-0131-00 


B050000 




R3618 


317-0161-00 


B010100 


B039999 


R3618 


317-0131-00 


B040000 




R3619 


311-1261-00 






R3620 


317-0510-00 


B010100 


B049999 



R3620 


311-1259-00 


B050000 




R3620 


317-0510-00 


B010100 


B039999 


R3620 


311-1259-00 


B040000 




R3621 


315-0821-00 






R3622 


315-0122-00 






R3623 


321-0116-00 






R3624 


321-0116-00 






R3625 


317-0240-00 


XB050000 




R3625 


317-0240-00 


XB040000 




R3630 


315-0821-00 






R3631 


321-0116-00 






R3632 


321-0116-00 






R3634 


323-0066-00 






R3637 


317-0100-00 






R3638 


325-0037-00 






R3639 


325-0037-00 






R3640 


315-0201-00 


B010100 


B049999 


R3640 


317-0201-00 


B050000 




R3640 


315-0201-00 


B010100 


B039999 


R3640 


317-0201-00 


B040000 




R3641 


315-0102-00 






R3642 


315-0131-00 


B010100 


B010148 


R3642 


315-0221-00 


B010149 


B049999 


R3642 


317-0221-00 


B050000 




R3642 


315-0221-00 


B010100 


B039999 



Name & Description 

RES., FXD, FILM: 267 OHM, 1% , 0. 125W 
RES . , FXD, FILM: 267 OHM, 1%,0. 125W 
RES., FXD, FILM: 51. 4K OHM, 0 . 1% , 0 . 125W 
RES. , FXD, FILM: 280 OHM, 1%,0. 125W 
RES. ,FXD,FILM:50 OHM,1%,0.05W 
RES. , FXD, FILM: 50 OHM,1%,0.05W 

RES . , FXD, FILM: 280 OHM, 1% , 0 . 125W 
RES. .FXD.CMPSN: 160 0HM,5%,0. 125W 
(7844 ONLY) 

RES . , FXD ,CMPSN : 1 30 OHM , 5% , 0 . 125W 
(7844 ONLY) 

RES . , FXD.CMPSN : 1 60 OHM , 5% ,0 . 125W 
(R7844 ONLY) 

RES. , FXD.CMPSN: 130 OHM, 5% , 0 . 125W 
(R7844 ONLY) 

RES. , VAR.NONWIR: 500 OHM, 10%, 0. 50W 
RES. ,FXD,CMPSN:51 OHM, 5%, 0 . 125W 
(7844 ONLY) 

(NOMINAL VALUE, SELECTED) 

RES. ,VAR,NONWIR: 100 OHM, 10% ,0 . 50W 
(7844 ONLY) 

RES . , FXD.CMPSN : 51 OHM, 5% , 0. 125W 
(R7844 ONLY) 

(NOMINAL VALUE, SELECTED) 

RES . , VAR , NONWIR: 100 OHM, 10% ,0. 50W 
(R7844 ONLY) 

RES . , FXD.CMPSN : 820 OHM,5%,0.25W 
RES. .FXD.CMPSN :1.2K 0HM,5%,0.25W 
RES . , FXD .FILM: 158 OHM, 1%,0. 125W 
RES. , FXD, FILM: 158 OHM, 1%, 0. 125W 
RES. .FXD.CMPSN: 24 OHM, 5%,0. 125W 
(7844 ONLY) 

RES. .FXD.CMPSN: 24 OHM, 5% , 0 . 125W 
(R7844 ONLY) 

RES., FXD.CMPSN: 820 OHM,5%,0.25W 
RES., FXD, FILM: 158 OHM, 1%,0. 125W 
RES., FXD, FILM: 158 OHM, 1%,0. 125W 
RES . , FXD, FILM: 47 . 5 0HM,1%,0.50W 

RES. .FXD.CMPSN: 10 0HM,5%,0. 125W 
RES. , FXD, FILM: 100 OHM,1%,0.05W 
RES., FXD, FILM: 100 OHM,1%,0.05W 
RES. .FXD.CMPSN: 200 OHM,5%,0.25W 
(7844 ONLY) 

RES . .FXD.CMPSN : 200 OHM, 5%, 0 . 125W 
(7844 ONLY) 

RES. .FXD.CMPSN: 200 OHM,5%,0.25W 
(R7844 ONLY) 

RES. .FXD.CMPSN: 200 OHM, 5% , 0 . 125W 
(R7844 ONLY) 

RES. .FXD.CMPSN: IK OHM,5%,0.25W 
RES., FXD.CMPSN: 130 OHM,5%,0.25W 
(7844 ONLY) 

RES . .FXD.CMPSN : 220 OHM,5%,0.25W 
(7844 ONLY) 

RES. .FXD.CMPSN: 220 OHM, 5% ,0 . 125W 
(7844 ONLY) 

RES . .FXD.CMPSN : 220 OHM,5%,0.25W 
( R7844 ONLY) 



Mfr 

Code Mfr Part Number 



91637 

91637 

91637 

91637 

03888 

03888 


MFF1816G267R0F 

MFF1816G267R0F 

MFF1816C51R40B 

MFF1816G280R0F 

PME50C50R0OF 

PME50C50R00F 


91637 

01121 


MFF 1 81 6G280R0F 
BB1615 


01121 


BB1315 


01121 


BB1615 


01121 


BB1315 


32997 

01121 


3329P-L58-501 

BB5105 


32997 


3329P-L58-101 


01121 


BB5105 


32997 


3329P-L58-101 


01121 

01121 

91637 

91637 

01121 


CB8215 

CB1225 

MFF1816G158R0F 

MFF1816G158R0F 

BB2405 


01121 


BB2405 


01121 

91637 

91637 

75042 


CB8215 

MFF1816G158R0F 

MFF1816G158R0F 

CECT0-47R50F 


01121 

14298 

14298 

01121 


BB1005 

RE1/8 C-A +/-1% 
RE 1/8 C-A +/-1Z 
CB2015 


01121 


BB2015 


01121 


CB2015 


01121 


BB2015 


01121 

01121 


CB1025 

CB1315 


01121 


CB2215 


01121 


BB2215 


01121 


CB2215 



8-100 



REV OCT 1981 





Replaceable Electrical Parts— 7844/R7844 Service 



Ckt No. 


Tektronix 
Part No. 


Serial/Model No. 

Eft Dscont 


Name & Description 


Mfr 

Code 


Mfr Part Number 


R3642 


317-0221-00 


B040000 




RES . , FXD , CMPSN : 220 OHM , 5% , 0 . 125W 
(R7844 ONLY) 

RES. ,FXD,CMPSN: 130 OHM,5%,0.25W 
(7844 ONLY) 

RES . , FXD, CMPSN : 110 OHM,5%,0.25W 
(7844 ONLY) 


01121 


BB2215 


R3644 


315-0131-00 


B010100 


B029999 


01121 


CB1315 


R3644 


315-0111-00 


B030000 




01121 


CB1115 














R3644 


315-0131-00 


B010100 


B019999 


RES. , FXD, CMPSN: 130 OHM, 52 , 0 . 25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 110 OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 200 OHM , 5% , 0 . 25W 
RES . , FXD , CMPSN: 270 0HM,5%,0.25W 


01121 


CB1315 


R3644 


315-0111-00 


B020000 




01121 


CB1115 


R3646 

R3646 


315-0201-00 

315-0271-00 


B010100 

B010149 


B010148 


01121 

01121 


CB2015 

CB2715 


R3660 

R3661 


325-0053-00 

317-0240-00 


XB050000 




RES. , FXD, FILM: 50 OHM,1%,0.05W 
RES . , FXD .CMPSN : 24 OHM,5%,0. 125W 
(7844 ONLY) 

RES . , FXD , CMPSN : 24 OHM , 5% , 0 . 1 2 5W 
(R7844 ONLY) 

RES. , FXD, FILM: 50 OHM,1%,0.05W 


03888 

01121 


PME50C50R00F 

BB2405 


R3661 


317-0240-00 


XB040000 




01121 


BB2405 


R3662 


325-0053-00 






03888 


PME50C50R00F 


R3663 


317-0161-00 


B010100 


B049999 


RES. , FXD, CMPSN: 160 OHM,5%,0. 125W 
(7844 ONLY) 

RES. , FXD, CMPSN: 130 OHM, 5% ,0 . 125W 
(7844 ONLY) 

RES. , FXD, CMPSN: 160 OHM, 5% , 0 . 125W 
(R7844 ONLY) 


01121 


BB1615 


R3663 


317-0131-00 


B050000 




01121 


BB1315 


R3663 


317-0161-00 


B010100 


B039999 


01121 


BB1615 














R3663 


317-0131-00 


B040000 




RES. , FXD, CMPSN: 130 OHM, 5% , 0 . 125W 
(R7844 ONLY) 

RES . .VAR.NONWIR: 500 OHM, 10% , 0 . 50W 
RES . , FXD, CMPSN : 51 OHM, 5%,0. 125W 


01121 


BB1315 


R3664 

R3665 


311-1261-00 

317-0510-00 


B010100 


B049999 


32997 

01121 


3329P-L58-501 

BB5105 



(7844 ONLY) 

(NOMINAL VALUE, SELECTED) 



R3665 


311-1259-00 


B050000 




RES. 


, VAR.NONWIR: 100 OHM, 10%, 0. 50W 


32997 


3329P-L58-101 










(7844 ONLY) 






R3665 


317-0510-00 


B010100 


B039999 


RES. 


, FXD, CMPSN : 51 OHM, 5% , 0 . 125W 


01121 


BB5105 










(R7844 ONLY) 














(NOMINAL VALUE, SELECTED) 






R3665 


311-1259-00 


B040000 




RES. 


.VAR.NONWIR: 100 OHM, 10% ,0 . 50W 


32997 


3329P-L58-101 










(R784^ ONLY) 






R3666 


315-0821-00 






RES. 


, FXD, CMPSN: 820 OHM,5%,0.25W 


01121 


CB8215 


R3667 


315-0122-00 






RES. 


, FXD, CMPSN :1.2K OHM,5%,0.25W 


01121 


CB1225 


R3668 


321-0116-00 






RES. 


, FXD, FILM: 158 OHM, 1% ,0 . 125W 


91637 


MFF1816G158R0F 


R3670 


321-0116-00 






RES. 


, FXD, FILM: 158 OHM, 1% , 0 . 125W 


91637 


MFF1816G 1 58R0F 


R3676 


315-0821-00 






RES. 


, FXD, CMPSN: 820 OHM,5%,0.25W 


01121 


CB8215 


R3678 


321-0116-00 






RES. 


, FXD, FILM: 158 OHM, 1% ,0 . 125W 


91637 


MFF1816G158R0F 


R3680 


321-0116-00 






RES. 


, FXD, FILM: 158 OHM, 1%,0. 125W 


91637 


MFF1816G158R0F 


R3682 


323-0066-00 






RES. 


, FXD, FILM: 47. 5 OHM,1%,0.50W 


75042 


CECT0-47R50F 


R3686 


325-0037-00 






RES. 


, FXD, FILM: 100 0HM,1%,0.05W 


14298 


RE1/8 C-A +/-1% 


R3687 


317-0100-00 






RES. 


, FXD, CMPSN: 10 OHM , 5% ,0. 125W 


01121 


BB1005 










(NOMINAL VALUE, SELECTED) 






R3688 


325-0037-00 






RES. 


, FXD, FILM: 100 OHM,1%,0.05W 


14298 


RE1/8 C-A +/-1% 


R3690 


315-0201-00 






RES. 


, FXD, CMPSN: 200 OHM,5%,0.25W 


01121 


CB2015 


R3691 


315-0102-00 






RES. 


, FXD, CMPSN: IK 0HM,5%,0.25W 


01121 


CB1025 


R3692 


315-0131-00 


B010100 


B010148 


RES. 


, FXD, CMPSN: 130 OHM,5%,0.25W 


01121 


CB1315 


R3692 


315-0221-00 


B010149 




RES. 


, FXD, CMPSN: 220 OHM,5%,0.25W 


01121 


CB2215 


R3694 


315-0131-00 


B010100 


B029999 


RES. 


, FXD , CMPSN : 1 30 OHM,5%,0.25W 


01121 


CB1315 










(7844 ONLY) 






R3694 


315-0111-00 


B030000 


B049999 


RES. 


, FXD, CMPSN: 110 OHM,5%,0.25W 


01121 


CB1115 



(7844 ONLY) 



REV OCT 1981 



8-101 




Replaceable Electrical Parts— 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eff 


Dscont 


R3694 


317-0111-00 


B050000 




R3694 


315-0131-00 


B010100 


B019999 


R3694 


315-0111-00 


B020000 


B039999 


R3694 


317-0111-00 


B040000 




R3696 


315-0201-00 


B010100 


B010148 


R3696 


315-0271-00 


B010149 


B049999 


R3696 


317-0271-00 


B050000 




R3696 


315-0271-00 


B010100 


B039999 


R3696 








R3696 


317-0271-00 


B040000 




R3697 


308-0584-00 






R3701 


321-1647-07 






R3704 


321-0138-00 






R3705 


321-0138-00 






R3711 


321-1647-07 






R3714 


.321-0140-00 






R3715 


325-0053-00 






R3716 


325-0053-00 






R3717 


321-0140-00 






R3718 


317-0161-00 


B010100 


B049999X 


R3718 


317-0161-00 


B010100 


B039999X 


R3719 


317-0161-00 


B010100 


B049999 


R3719 


317-0301-00 


B050000 




R3719 


317-0161-00 


B010100 


B039999 


R3719 


317-0301-00 


B040000 




R3720 


317-0510-00 


B010100 


B049999 


R3720 


311-1259-00 


B050000 




R3720 


317-0510-00 


8010100 


B039999 


R3720 


311-1259-00 


B040000 




R3721 


315-0821-00 






R3722 


315-0122-00 






R3723 


321-0116-00 






R3724 


321-0116-00 






R3725 


317-0240-00 


XB050000 




R3725 


317-0240-00 


XB040000 





Name & Description 



RES . , FXD, CMPSN : 1 10 OHM, 5% ,0 . 125W 
(7844 ONLY) 

(NOMINAL VALUE .SELECTED) 

RES. , FXD, CMPSN: 130 OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD , CMPSN : 1 1 0 OHM , 5% , 0 . 2 5W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 110 OHM, 5% , 0 . 125W 
(R7844 ONLY) 

(NOMINAL VALUE, SELECTED) 

RES. , FXD, CMPSN: 200 OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 270 OHM,5%,0.25W 
(7844 ONLY) 



RES. , FXD, CMPSN: 270 OHM, 5% ,0 . I25W 
(7844 ONLY) 

(NOMINAL VALUE, SELECTED) 

RES., FXD, CMPSN: 270 OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD, CMPSN : 270 OHM, 5% ,0 . 125W 
(R7844 ONLY) 

(NOMINAL VALUE, SELECTED) 

RES . , FXD , WW: 20 OHM,0.5%,5W 
RES. , FXD, FILM: 51. 4K OHM.O . 1% ,0 . 125W 
RES ., FXD, FILM : 267 OHM, 1%,0. 125W 
RES. , FXD, FILM: 267 OHM,1%,0.125W 
RES., FXD, FILM: 51. 4K OHM, 0 . 1% ,0 . 125W 
RES. , FXD, FILM: 280 OHM, 1Z,0. 125W 



RES. , FXD, FILM: 50 OHM,1%,0.05W 
RES., FXD, FILM: 50 OHM,1X,0.05W 
RES . , FXD, FILM: 280 OHM, 1X,0. 125W 
RES. , FXD, CMPSN: 160 OHM,5X,0. 125W 
(7844 ONLY) 

RES. , FXD, CMPSN: 160 OHM, 5X,0. 125W 
( R7844 ONLY) 



RES. , FXD, CMPSN: 160 OHM, 57. ,0 . 125W 
(7844 ONLY) 

RES. , FXD, CMPSN: 300 OHM , 5% , 0 . 125W 
(7844 ONLY) 

RES., FXD, CMPSN: 160 OHM , 5% , 0 . 125W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 300 OHM, 5%,0. 125W 
(R7844 ONLY) 

RES . , FXD , CMPSN : 51 OHM, 5% ,0 . 125W 
(7844 ONLY) 

RES. ,VAR,NONWIR: 100 OHM , 10X ,0 . 50W 
(7844 ONLY) 



RES . ,FXD , CMPSN : 51 OHM, 5X , 0 . 125W 
( R7844 ONLY) 

RES . , VAR, NONWIR : 100 OHM, 107. , 0 . 50W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 820 OHM,5X,0.25W 
RES. , FXD, CMPSN: 1.2K OHM,5%,0.25W 

RES., FXD, FILM: 158 OHM, 1% , 0 . 125W 
RES., FXD, FILM: 158 OHM,1X,0.125W 
RES. , FXD, CMPSN: 24 OHM, 5X , 0 . 125W 
(7844 ONLY) 

RES. , FXD, CMPSN: 24 OHM, 5% , 0 . 125W 
( R7844 ONLY) 



Mfr 

Code Mfr Part Number 



01121 


BB1115 


01121 


CB1315 


01121 


CB1115 


01121 


BB1115 


01121 


CB2015 


01121 


CB2715 


01121 


BB2715 


01121 


CB2715 


01121 


BB2715 


91637 

91637 

91637 

91637 

91637 

91637 


RS5-K20R00D 

MFF1816C51R40B 

MFF1816G267R0F 

MFF1816G267R0F 

MFF1816C51R40B 

MFF1816G280R0F 


03888 

03888 

91637 

01121 


PME50C50R00F 

PME50C50R00F 

MFF1816G280R0F 

BB1615 


01121 


BB1615 


01121 


BB1615 


01121 


BB3015 


01121 


BB1615 


01121 


BB3015 


01121 


BB5105 


32997 


3329P-L58-101 


01121 


BB5105 


32997 


3329P-L58-101 


01121 

01121 


CB8215 

CB1225 


91637 

91637 

01121 


MFF1816G158R0F 

MFF1816G158R0F 

BB2405 


01121 


BB2405 



8-102 



REV OCT 1981 





Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix 
Ckt No. Part No. 



Serial/Model No. 

Eft Dscont 



Name & Description 



Mfr 

Code Mfr Part Number 



R3730 


315-0821-00 






R3731 


321-0116-00 






R3732 


321-0116-00 






R3734 


323-0066-00 






R3735 


308-0756-00 






R3736 


315-0180-00 






R3737 


317-0100-00 






R3738 


325-0037-00 






R3739 


325-0037-00 






R3740 


315-0201-00 






R3741 


315-0102-00 






R3742 


315-0131-00 


B010100 


B010148 


R3742 


315-0221-00 


B010149 




R3744 


315-0131-00 


B010100 


B029999 


R3744 


315-0111-00 


B030000 


B049999 


R3744 


317-0111-00 


B050000 




R3744 


315-0131-00 


B010100 


B019999 


R3744 


315-0111-00 


B020000 


B039999 


R3744 


317-0111-00 


B040000 




R3746 


315-0201-00 


B010100 


B010148 


R3746 


315-0271-00 


B010149 


B049999 


R3746 


317-0271-00 


B050000 




R3746 


315-0271-00 


B010100 


B039999 


R3746 


317-0271-00 


B040000 




R3748 


315-0332-00 






R3760 


325-0053-00 






R3761 


317-0240-00 


XB050000 




R3761 


317-0240-00 


XB040000 




R3762 


325-0053-00 






R3763 


317-0161-00 


B010100 


B049999X 


R3763 


317-0161-00 


B010100 


B039999X 


R3764 


317-0161-00 


B010100 


B049999 


R3764 


317-0301-00 


B050000 




R3764 


317-0161-00 


B010100 


B039999 


R3764 


317-0301-00 


B040000 




R3765 


317-0510-00 


B010100 


B049999 



RES . .FXD.CMPSN : 820 OHM.5Z.0.25W 
RES. .FXD.FILM: 158 OHM , 1% , 0 . 125W 
RES., FXD, FILM: 158 OHM, 12 , 0. 125W 
RES . ,FXD , FILM: A7 . 5 OHM.1Z.0.50W 
RES. ,FXD,WW:100 0HM,1%,3W 

RES . , FXD,CMPSN : 18 OHM.5Z.0.25W 
RES . , FXD ,CMPSN : 10 OHM, 5% ,0. 125W 
RES., FXD, FILM: 100 OHM,1%,0.05W 
RES., FXD, FILM: 100 OHM.1Z.0.05W 
RES . , FXD , CMPSN : 200 OHM.5Z.0.25W 
RES. .FXD.CMPSN: IK OHM.5Z.0.25W 

RES., FXD, CMPSN: 130 OHM,5%,0.25W 
RES . , FXD.CMPSN: 220 OHM.5Z.0.25W 
RES. .FXD.CMPSN: 130 OHM.5Z.0.25W 
(7844 .ONLY) 

RES. .FXD.CMPSN: 110 OHM.5Z.0.25W 
(7844 ONLY) 

RES. .FXD.CMPSN: 110 OHM , 52 , 0 . 125W 
(7844 ONLY) 

RES. .FXD.CMPSN: 130 OHM.52.0.25W 
( R7844 ONLY) 

RES., FXD, CMPSN: 110 OHM,52,0.25W 
(R7844 ONLY) 

RES. .FXD.CMPSN: 110 OHM, 52 , 0. 125W 
(R7844 ONLY) 

RES . , FXD.CMPSN : 200 OHM.52.0.25W 
(7844 ONLY) 

RES. .FXD.CMPSN: 2 70 OHM.52.0.25W 
(7844 ONLY) 

RES . , FXD.CMPSN : 270 OHM, 52 ,0 . 125W 
(7844 ONLY) 

RES. .FXD.CMPSN: 2 70 OHM.52.0.25W 
(R7844 ONLY) 

RES. .FXD.CMPSN: 270 OHM, 52,0. 125W 
(R7844 ONLY) 

RES. .FXD.CMPSN : 3. 3K OHM.52.0.25W 
RES . , FXD, FILM: 50 OHM.12.0.05W 
RES. .FXD.CMPSN: 24 OHM, 52 ,0. 125W 
(7844 ONLY) 

RES., FXD, CMPSN: 24 OHM, 52 ,0 . 125W 
(R7844 ONLY) 

RES. , FXD, FILM: 50 OHM.1Z.0.05W 
RES. , FXD.CMPSN: 1 60 OHM, 52, 0 . 1 25W 
(7844 ONLY) 

RES. .FXD.CMPSN: 160 OHM , 52 ,0 . 125W 
(R7844 ONLY) 

RES. .FXD.CMPSN: 160 OHM , 52 , 0 . 125W 
(7844 ONLY) 

RES. .FXD.CMPSN: 300 OHM, 52 ,0 . 125W 
(7844 ONLY) 

RES. .FXD.CMPSN: 160 OHM, 52, 0 . 125W 
(R7844 ONLY) 

RES. .FXD.CMPSN: 300 OHM, 52,0. 125W 
(R7844 ONLY) 

RES. .FXD.CMPSN: 51 OHM, 52 ,0 . 125W 
(7844 ONLY) 

(NOMINAL VALUE, SELECTED) 



01121 

91637 

91637 

75042 

91637 


CB8215 

MFF1816G158R0F 

MFF1816G158R0F 

CECT0-47R50F 

RS2B-B100R0F 


01121 

01121 

14298 

14298 

01121 

01121 


CB1805 

BB1005 

RE 1/8 C-A +/-12 
RE 1/8 C-A +/-12 
CB2015 
CB1025 


01121 

01121 

01121 


CB1315 

CB2215 

CB1315 


01121 


CB1115 


01121 


BB1115 


01121 


CB1315 


01121 


CB1115 


01121 


BB1115 


01121 


CB2015 


01121 


CB2715 


01121 


BB2715 


01121 


CB2715 


01121 


BB2715 


01121 

03888 

01121 


CB3325 

PME50C50R00F 

BB2405 


01121 


BB2405 


03888 

01121 


PME50C50R00F 

BB1615 


01121 


BB1615 


01121 


BB1615 


01121 


BB3015 


01121 


BB1615 


01121 


BB3015 


01121 


BB5105 



REV OCT 1981 



8-103 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 



Ckt No. 


Part No. 


Eft 


Dscont 


R3765 

R3765 


311-1259-00 

317-0510-00 


B050000 

B010100 


B039999 



R3765 


311-1259-00 


B040000 




R3766 


315-0821-00 






R3767 


315-0122-00 






R3768 


321-0116-00 






R3770 


321-0116-00 






R3776 


315-0821-00 






R3778 


321-0116-00 






R3780 


321-0116-00 






R3782 


323-0066-00 






R3783 


308-0239-00 






R3784 


321-0186-00 






R3785 


321-0129-00 






R3786 


325-0037-00 






R3787 


317-0100-00 






R3788 


325-0037-00 






R3789 


315-0100-00 






R3790 


315-0201-00 


B010100 


B049999 


R3790 


317-0201-00 


B050000 




R3790 


315-0201-00 


B010100 


B039999 


R3790 


317-0201-00 


B040000 





R3791 

R3792 


315-0102-00 

315-0131-00 


B010100 


B010148 


R3792 


315-0221-00 


B010149 


B049999 


R3792 


317-0221-00 


B050000 




R3792 


315-0221-00 


B010100 


B039999 


R3792 


317-0221-00 


B040000 




R3794 


315-0131-00 


B010100 


B029999 



R3794 


315-0111-00 


B030000 




R3794 


315-0131-00 


B010100 


B019999 


R3794 


315-0111-00 


B020000 




R3795 

R3796 

R3796 

R3797 


315-0152-00 

315-0201-00 

315-0271-00 

315-0222-00 


B010100 

B010149 

XB050000 


B010148 


R3797 


315-0222-00 


XB040000 





Name & Description 



RES. ,VAR,NONWIR: 100 OHM, 10%, 0. 50W 
(7844 ONLY ) 

RES . , FXD , CMPSN : 51 OHM, 5% ,0 . 125W 
(R7844 ONLY) 

(NOMINAL VALUE, SELECTED) 

RES . , VAR.NONWIR: 100 OHM, 10% ,0 . 50W 
( R7844 ONLY) 

RES. , FXD, CMPSN: 820 0HM,5%,0.25W 
RES., FXD, CMPSN : 1 . 2K OHM,5%,0.25W 
RES., FXD, FILM: 158 OHM, 1%,0. 125W 
RES., FXD, FILM: 158 OHM, 1%,0. 125W 



RES. , FXD, CMPSN: 820 OHM,5%,0.25W 
RES., FXD, FILM: 158 OHM , 1 % , 0 . 1 2 5W 
RES., FXD, FILM: 158 OHM, 1% , 0 . 125W 
RES . ,FXD, FILM : 47 . 5 OHM,1%,0.50W 
RES . , FXD, WW : 84 OHM,l%,3W 
RES. , FXD, FILM: 845 OHM, 1% ,0. 125W 

RES . , FXD, FILM: 215 OHM, 1% , 0. 125W 
RES., FXD, FILM: 100 OHM,1%,0.05W 
RES. , FXD, CMPSN: 10 OHM, 5% ,0 . 125W 
RES. , FXD, FILM: 100 OHM,1%,0.05W 
RES. , FXD, CMPSN: 10 OHM, 5X , 0. 25W 
RES. , FXD, CMPSN: 200 OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 200 OHM, 5Z,0. 125W 
(7844 ONLY) 

RES. , FXD, CMPSN: 200 OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 200 OHM, 5% , 0 . 125W 
(R7844 ONLY) 



RES. , FXD, CMPSN: IK OHM,5%,0.25W 
RES. , FXD, CMPSN: 130 OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 220 OHM, 5% , 0 . 25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 220 OHM,5Z,0. 125W 
(7844 ONLY) 



RES. , FXD, CMPSN: 220 0HM,5Z,0.25W 
(R7844 ONLY ) 

RES . , FXD , CMPSN : 220 OHM, 5% ,0 . 125W 
( R7844 ONLY) 

RES. , FXD, CMPSN: 130 OHM, 5Z , 0 . 25W 
(7844 ONLY) 



RES. , FXD, CMPSN: 110 OHM,5%,0.25W 
(7844 ONLY) 

RES., FXD, CMPSN: 130 OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD , CMPSN : 1 10 OHM,5%,0.25W 
(R7844 ONLY) 



RES. , FXD, CMPSN : 1 . 5K OHM,5Z,0.25W 
RES. , FXD, CMPSN: 200 OHM,5%,0.25W 
RES. , FXD, CMPSN: 270 OHM,5%,0.25W 
RES. , FXD, CMPSN: 2. 2K OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD,, CMPSN: 2. 2K OHM,5%,0.25W 
( R7844 ONLY) 



Mfr 

Code Mfr Part Number 



32997 


3329P-L58-101 


01121 


BB5105 



32997 


3329P-L58-101 


01121 

01121 

91637 

91637 


CB8215 

CB1225 

MFF1816G158R0F 

MFF1816G158R0F 


01121 

91637 

91637 

75042 

91637 

91637 


CB8215 

MFF1816G158R0F 

MFF1816G158R0F 

CECT0-47R50F 

RS2B-B84R00F 

MFF1816G845R0F 


91637 

14298 

01121 

14298 

01121 

01121 


MFF1816G215R0F 
RE 1/8 C-A +/-1Z 
BB1005 

RE 1/8 C-A +/-1Z 

CB1005 

CB2015 


01121 


BB2015 


01121 


CB2015 


01121 


BB2015 


01121 

01121 


CB1025 

CB1315 


01121 


CB2215 


01121 


BB2215 


01121 


CB2215 


01121 


BB2215 


01121 


CB1315 


01121 


CB1115 


01121 


CB1315 


01121 


CB1115 


01121 

01121 

01121 

01121 


CB1525 

CB2015 

CB2715 

CB2225 


01121 


CB2225 



8-104 



REV OCT 1981 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix 
Ckt No. Part No. 



R3798 

R4102 


315-0332-00 

315-0102-00 


R4103 


315-0332-00 


R4104 


315-0243-00 


R4106 


315-0103-00 


R4107 


315-0682-00 


R4109 


315-0333-00 


R4110 


315-0103-00 


R4112 


315-0512-00 


R4115 


315-0472-00 


R4116 


315-0273-00 


R4119 


315-0331-00 


R4120 


315-0153-00 


R4123 


315-0123-00 


R4125 


315-0103-00 


R4130 


315-0472-00 


R4134 


315-0472-00 


R4135 


315-0273-00 


R4140 


315-0103-00 


R4142 


315-0512-00 


R4143 


315-0362-00 


R4145 


315-0391-00 


R4145 


315-0301-00 


R4147 


315-0332-00 


R4149 


315-0153-00 


R4153 


315-0122-00 


R4154 


315-0302-00 


R4155 


315-0202-00 


R4157 


315-0822-00 



Serial/Model No. 

Eff Dscont 



BOIOIOO B109999 
B1 10000 



Name & Description 



RES . , FXD, CMPSN : 3 . 3K OHM,5%,0.25W 
RES. ,E'XD,CMPSN: IK OHM,5%,0.25W 
(R4102, OPTION 22 ONLY) 

RES . ,FXD , CMPSN : 3 . 3K OHM, 5% ,0 . 25W 
(R4103, OPTION 22 ONLY) 

RES. ,1’XD, CMPSN : 24K OHM, 52. , 0 . 25W 
(R4104, OPTION 22 ONLY) 

RES., f’XD, CMPSN: 10K OHM,5%,0.25W 
(R4106, OPTION 22 ONLY) 

RES., FXD , CMPSN : 6 . 8K OHM,5%,0.25W 
(R4107 , OPTION 22 ONLY) 

RES., FXD, CMPSN :33K OHM, 5 % , 0 . 25W 
(R4109, OPTION 22 ONLY) 

RES. , FXD, CMPSN: 10K OHM,5%,0.25W 
(R4110, OPTION 22 ONLY) 

RES. , FXD, CMPSN: 5. IK OHM,5%,0.25W 
(R4112, OPTION 22 ONLY) 

RES . , FXD , CMPSN : 4 . 7K OHM, 5% , 0 . 25W 
(R4115, OPTION 22 ONLY) 

RES., FXD, CMPSN: 2 7K OHM,5%,0.25W 
(R4116, OPTION 22 ONLY) 

RES. , FXD, CMPSN: 330 OHM , 52 ,0 . 25W 
(R4119, OPTION 22 ONLY) 

RES. , FXD, CMPSN : 15K 0HM,52,0.25W 
(R4120, OPTION 22 ONLY) 



RES., FXD, CMPSN :12K 0HM,5%,0.25W 
(R4123, OPTION 22 ONLY) 

RES. , FXD, CMPSN :1 OK OHM,5%,0.25W 
(R4125 , OPTION 22 ONLY) 

RES. , FXD, CMPSN: 4. 7K OHM, 5% , 0 . 25W 
(R4130, OPTION 22 ONLY) 



RES. , FXD, CMPSN: 4. 7K OHM,5%,0.25W 
(R4134, OPTION 22 ONLY) 

RES . , FXD, CMPSN : 27K OHM,5%,0.25W 
(R4135, OPTION 22 ONLY) 

RES. , FXD, CMPSN: 10K 0HM,5%,0.25W 
(R4140 , OPTION 22 ONLY) 

RES., FXD, CMPSN: 5. IK OHM,5%,0.25W 
(R4142, OPTION 22 ONLY) 

RES. , FXD, CMPSN: 3. 6K OHM,5%,0.25W 
(R4143, OPTION 22 ONLY) 

RES. , FXD, CMPSN: 390 OHM,5%,0.25W 
(OPTION 22 ONLY) 

RES. , FXD, CMPSN: 300 OHM, 52 , 0 . 25W 
(OPTION 22 ONLY) 

RES. , FXD, CMPSN: 3. 3K OHM,52,0.25W 
(R4147, OPTION 22 ONLY) 

RES., FXD, CMPSN : 1 5K 0HM,5X,0.25W 
(R4149, OPTION 22 ONLY) 

RES., FXD, CMPSN: 1.2K OHM,5%,0.25W 
(R4153, OPTION 22 ONLY) 

RES., FXD, CMPSN :3K OHM , 5% , 0 . 25W 
(R4154, OPTION 22 ONLY) 

RES. , FXD, CMPSN :2K OHM , 5% , 0 . 25W 
(R4155, OPTION 22 ONLY) 



RES. , FXD, CMPSN: 8. 2K OHM,5Z,0.25W 
(R4157, OPTION 22 ONLY) 



Mfr 

Code Mfr Part Number 



01121 

01121 


CB3325 

CB1025 


01121 


CB3325 


01121 


CB2435 


01121 


CB1035 


01121 


CB6825 


01121 


CB3335 


01121 


CB1035 


01121 


CB5125 


01121 


CB4725 


01121 


CB2735 


01121 


CB3315 


01121 


CB1535 


01121 


CB1235 


01121 


CB1035 


01121 


CB4725 


01121 


CB4725 


01121 


CB2735 


01121 


CB1035 


01121 


CB5125 


01121 


CB3625 


01121 


CB3915 


01121 


CB3015 


01121 


CB3325 


01121 


CB1535 


01121 


CB1225 


01121 


CB3025 


01121 


CB2025 


01121 


CB8225 



REV OCT 1981 



8-105 




Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No, 
Ckt No. Part No. Eff Dscont 



R4158 


315-0681-00 




R4159 


321-0285-00 




R4I61 


321-0277-00 




R4164 


301-0122-00 




R4165 


315-0123-00 




R4167 


315-0822-00 




R4168 


315-0681-00 




R4169 


321-0285-00 




R4171 


321-0277-00 




R4174 


301-0122-00 




R4180 


315-0153-00 


XB 11 0000 


R4181 


315-0333-00 


XB110000 


R4182 


315-0122-00 




R4196 


315-0820-00 




R4802 


321-0079-00 


XB100000 


R4802 


321-0079-00 


XB 110000 


R4806 


323-0168-00 


XB 100000 


R4806 


323-0168-00 


XB 11 0000 


R4807 


315-0223-00 


XB100000 


R4807 


315-0223-00 


XB1 10000 


R4810 


321-0207-00 


XB 100000 


R4810 


321-0207-00 


XB110000 


R4811 


321-0253-00 


XB100000 


R4811 


321-0253-00 


XB 11 0000 


R4812 


323-0168-00 


XB100000 


R4812 


323-0168-00 


XB 110000 


R4814 


321-0079-00 


XB 100000 


R4814 


321-0079-00 


XB1 10000 


R4815 


321-0287-00 


XB100000 



Name & Description 



RES . , FXD , CMPSN : 680 OHM, 55S , 0 . 25W 
(R4158, OPTION 22 ONLY) 

RES . , FXD .FILM: 9 . 09K OHM, 1% , 0 . 125W 
(R4159 , OPTION 22 ONLY) 

RES . ,FXD , FILM: 7 . 5K OHM, 1Z ,0 . 125W 
(R4161 , OPTION 22 ONLY) 

RES. , FXD, CMPSN: 1.2K OHM,5%,0.50W 
(R4164 , OPTION 22 ONLY) 

RES., FXD, CMPSN: 12K 0HM,5%,0.25W 
(R4165 , OPTION 22 ONLY) 

RES. , FXD, CMPSN: 8. 2K OHM,5%,0.25W 
(R4167, OPTION 22 ONLY) 

RES., FXD, CMPSN: 680 OHM, 5% , 0 . 25W 
(R4168, OPTION 22 ONLY) 

RES . , FXD , FILM: 9 . 09K OHM, 1Z,0. 125W 
(R4169 , OPTION 22 ONLY) 

RES . ,FXD , FILM: 7 . 5K OHM, 1% , 0 . 125W 
(R4171 , OPTION 22 ONLY) 

RES., FXD, CMPSN : 1 . 2K OHM,5%,0.50W 
(R4174, OPTION 22 ONLY) 

RES. , FXD, CMPSN : 15K OHM,5%,0.25W 
(R4180, OPTION 22 ONLY) 

RES. , FXD, CMPSN :33K 0HM,5%,0.25W 
(R4181 , OPTION 22 ONLY) 

RES., FXD, CMPSN :1.2K OHM, 5% , 0 . 25W 
(R4182 , OPTION 22 ONLY) 

RES. , FXD, CMPSN: 82 OHM,5%,0.25W 
(R4196 , OPTION 22 ONLY) 

RES. , FXD, FILM: 64. 9 OHM , 1% , 0 . 125W 
(R7844 ONLY) 

RES . , FXD , FILM : 64 . 9 OHM, 1% , 0 . 125W 
(7844 ONLY) 

RES., FXD, FILM: 54 9 OHM,U,0.50W 
(R7844 ONLY) 

RES., FXD, FILM: 549 OHM,1%,0.50W 
(7844 ONLY) 

RES. , FXD , CMPSN : 22K OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 22K OHM,5%,0.25W 
(7844 ONLY) 

RES., FXD, FILM: 1.4K OHM,U,0.125W 
(R7844 ONLY) 

RES., FXD, FILM: 1.4K OHM,1%,0.125W 
(7844 ONLY) 

RES., FXD, FILM: 4. 22K OHM, 1% ,0 . 125W 
(R7844 ONLY) 

RES. ,FXD, FILM;4 . 22K OHM, 1% ,0 . 1 25W 
(7844 ONLY) 

RES. , FXD, FILM: 549 OHM,U,0.50W 
(R7844 ONLY) 

RES. , FXD, FILM: 549 OHM,U,0.50W 
(7844 ONLY) 

RES . , FXD , F ILM : 64 . 9 OHM,1%,0.125W 
(R7844 ONLY) 

RES . , FXD , F ILM : 64 . 9 OHM, 1% ,0 . 125W 
(7844 ONLY) 

RES. , FXD .FILM : 9 . 53K OHM, 1%,0. 125W 
(R7844 ONLY) 



Mfr 

Code Mfr Part Number 



01121 


CB6815 


91637 


MFF1816G90900F 


91637 


MFF1816G75000F 


01121 


EB1225 


01121 


CB1235 


01121 


CB8225 


01121 


CB6815 


91637 


MFF1816G90900F 


91637 


MFF1816G75000F 


01121 


EB1225 


01121 


CB1535 


01121 


CB3335 


01121 


CB1225 


01121 


CB8205 


91637 


MFF1816G64R90F 


91637 


MFF1816G64R90F 


75042 


CECT0-5490F 


75042 


CECT0-5490F 


01121 


CB2235 


01121 


CB2235 


91637 


MFF1816G14000F 


91637 


MFF1816G14000F 


91637 


MFF1816G42200F 


91637 


MFF1816G42200F 


75042 


CECT0-5490F 


75042 


CECT0-5490F 


91637 


MFF1816G64R90F 


91637 


MFF1816G64R90F 


91637 


MFF1816G95300F 



8-106 



REV OCT 1981 





Ckt No. 

R4815 

R4816 

R4816 

R4818 

R4818 

R4819 

R4819 

R4820 

R4820 

R4821 

R4821 

R4823 

R4823 

R4823 

R4823 

R4824 

R4824 

R4825 

R4825 

R4826 

R4826 

R4827 

R4827 

R4829 

R4829 

R4830 

R4830 

R4832 



Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. Mfr 

Part No. Eff Dscont Name & Description Code Mfr Part Number 



321-0287-00 


XB1 10000 


RES . , FXD , FILM: 9 . 53K OHM, 1%,0. 125W 
(7844 ONLY) 


91637 


MFF1816G95300F 


311-1225-00 


XB 100000 


RE S . ., VAR , NONWIR : 1 K OHM, 20% , 0 . 50W 
(R7844 ONLY) 


32997 


3386F-T04-102 


311-1225-00 


XB1 10000 


RES. ., VAR, NONWIR: IK OHM, 20% ,0 . 50W 
(7844 ONLY) 


32997 


3386F-T04-102 


321-0205-00 


XB100000 


RES. , FXD, FILM: 1.33K OHM, 1%,0. 125W 
(R7844 ONLY) 


91637 


MFF1816G13300F 


321-0205-00 


XB110000 


RES. , FXD, FILM : 1 . 33K OHM, 1%,0. 125W 
(7844 ONLY) 


91637 


MFF1816G13300F 


321-0124-00 


XB100000 


RES. ,FXD, FILM: 191 OHM, 1%,0. 125W 
(R7844 ONLY) 


91637 


MFF1816G191R0F 


321-0124-00 


XB110000 


RES. ,FXD, FILM: 191 OHM, 1% , 0 . 125W 
(7844 ONLY) 


91637 


MFF1816G191R0F 


311-1222-00 


XB100000 


RES. , VAR, NONWIR: 100 OHM, 20% , 0 . 50W 
(R7844 ONLY) 


32997 


3386F-T04-101 


311-1222-00 


XB110000 


RES. , VAR, NONWIR: 100 OHM, 20% , 0 . 50W 
(7844 ONLY) 


32997 


3386F-T04-101 



321-0109-00 XB 100000 



321-0109-00 XB110000 



315-0201-00 XB100000 B100453 



RES. , FXD, FILM: 133 OHM, 1% ,0 . 125W 
(R7844 ONLY) 

RES. ,FXD, FILM: 133 OHM, 1%,0. 125W 
(7844 ONLY) 

RES . , FXD , CMPSN : 200 OHM,5%,0.25W 
(R7844 ONLY) 



91637 MFF1816G133R0F 
91637 MFF1816G133R0F 
01121 CB2015 



315-0101-00 B100454 



315-0201-00 XB 11 0000 B110894 



315-0101-00 B110895 



RES. , FXD, CMPSN: 100 OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 200 OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 100 0HM,5%,0.25W 
(7844 ONLY) 



01121 CB1015 
01121 CB2015 
01121 CB1015 



315-0621-00 XB100000 



315-0621-00 XB110000 



321-0830-03 XB 100000 



RES. , FXD, CMPSN: 620 0HM,5%,0.25W 


01121 


CB6215 


(R7844 ONLY) 






RES. , FXD, CMPSN: 620 OHM,5%,0.25W 


01121 


CB6215 


(7844 ONLY) 






RES . ,FXD , FILM : 2.41K OHM,0.25%,0. 125W 


91637 


MFF1816D24100C 



(R7844 ONLY) 



321-0830-03 XB110000 



321-0830-03 XB100000 



321-0830-03 XB1 10000 



RES . , FXD .FILM: 2 .41K OHM.O . 25% ,0 . 125W 
(7844 ONLY) 

RES., FXD, FILM: 2. 41K OHM.O . 25% , 0 . 125W 
(R7844 ONLY) 

RES . , FXD , FILM: 2 .41K OHM, 0 . 25%, 0 . 125W 
(7844 ONLY) 



91637 MFF1816D24100C 
91637 MFF1816D24100C 
91637 MFF1816D24100C 



321-0261-00 XB 100000 



321-0261-00 XB110000 



315-0152-00 XB100000 



RES . , FXD, FILM : 5 . 1 IK OHM, 1% ,0 . 125W 
(R7844 ONLY) 

RES . , FXD .FILM: 5. 1 IK OHM, 1% ,0. 125W 
(7844 ONLY) 

RES., FXD, CMPSN :1.5K OHM,5%,0.25W 
(R7844 ONLY) 



91637 MFF1816G51 100F 
91637 MFF1 816G51 100F 
01121 CB1525 



315-0152-00 XB110000 



315-0243-00 XB100000 



315-0243-00 XB1 10000 



RES., FXD, CMPSN : 1 . 5K OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN :24K OHM,5%,0.25W 
( R7844 ONLY) 

RES., FXD, CMPSN : 24K OHM,5%,0.25W 
(7844 ONLY) 



01121 CB1525 
01121 CB2435 
01121 CB2435 



321-0185-00 XB100000 



RES . , FXD .FILM : 825 OHM, 1% ,0 . 125W 
(R7844 ONLY) 



91637 MFF1816G825R0F 



REV OCT 1981 



8-107 



Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 
Ckt No. Part No. Eft Dscont 



R4832 


321-0185-00 


XB1 10000 


R4833 


315-0430-00 


XB100000 


R4833 


315-0430-00 


XB110000 


R4835 


321-0192-00 


XB100000 


R4835 


321-0192-00 


XB1 10000 


R4836 


321-0241-00 


XB100000 


R4836 


321-0241-00 


XB 11 0000 


R4837 


321-0192-00 


XB100000 


R4837 


321-0192-00 


XB110000 


R4838 


321-0192-00 


XB100000 


R4838 


321-0192-00 


XB110000 


R4840 


311-1225-00 


XB100000 


R4840 


311-1225-00 


XB 110000 


R4841 


321-0299-00 


XB 100000 


R4841 


321-0299-00 


XB110000 


R4842 


321-0185-00 


XB100000 


R4842 


321-0185-00 


XB110000 


R4843 


315-0430-00 


XB 100000 


R4843 


315-0430-00 


XB1 10000 


R4845 


323-0706-01 


XB100000 


R4845 


323-0706-01 


XB110000 


R4846 


315-0100-00 


XB 100000 


R4846 


315-0100-00 


XB 11 0000 


R4847 


321-0114-00 


XB 100000 


R4847 


321-0114-00 


XB110000 


R4848 


315-0220-00 


XB100000 


R4848 


315-0220-00 


XB110000 


R4850 


315-0102-00 


XB100000 


R4850 


315-0102-00 


XB1 10000 



Name & Description 


Mtr 

Code 


Mfr Part Number 


RES. ,FXD, FILM: 825 OHM, 1% , 0 . 125W 
(7844 ONLY) 


91637 


MFF1816G825R0F 


RES. , FXD , CMPSN : 43 OHM,5Z,0.25W 
(R7844 ONLY) 


01121 


CB4305 


RES. , FXD, CMPSN: 43 OHM,5%,0.25W 
(7844 ONLY) 


01121 


CB4305 


RES . , FXD , FILM: 976 OHM, 1% , 0 . 125W 
(R7844 ONLY) 


91637 


MFF1816G976R0F 


RES. , FXD, FILM : 976 OHM, 1Z, 0 . 1 25W 
(7844 ONLY) 


91637 


MFF1816G976R0F 


RES . ,FXD , FILM: 3 . 16K OHM, 1% , 0 . 125W 
(R7844 ONLY) 


91637 


MFF1816G31600F 


RES . , FXD, FILM: 3. 16K OHM, 12 ,0. 125W 
(7844 ONLY) 


91637 


MFF1816G31600F 


RES., FXD, FILM: 976 OHM, 1%,0. 125W 
(R7844 ONLY) 


91637 


MFF1816G976R0F 


RES., FXD, FILM: 976 OHM, 12,0. 125W 
(7844 ONLY) 


91637 


MFF1816G976R0F 


RES . ,FXD , FILM: 976 OHM, 1%,0. 125W 
(R7844 ONLY) 


91637 


MFF1816G976R0F 


RES . , FXD, FILM: 976 OHM , 12 , 0 . 125W 
(7844 ONLY) 


91637 


MFF1816G976R0F 


RES. ,VAR, NONWIR: IK OHM, 20Z ,0 . 50W 
(R7844 ONLY) 


32997 


3386F-T04-102 


RES. , VAR, NONWIR: IK OHM, 20Z, 0 . 50W 
(7844 ONLY) 


32997 


3386F-T04-102 


RES., FXD, FILM: 1 2. 7K OHM, 1Z,0. 125W 
(R7844 ONLY) 


91637 


MFF1816G12701F 


RES . , FXD, FILM: 12 . 7K OHM, 1Z,0. 125W 
(7844 ONLY) 


91637 


MFF1816G12701F 


RES . , FXD, FILM: 825 OHM, 1%,0. 125W 
(R7844 ONLY) 


91637 


MFF1816G825R0F 


RES. , FXD, FILM: 825 OHM, 1%,0. 125W 
(7844 ONLY) 


91637 


MFF1816G825R0F 


RES. , FXD, CMPSN: 43 OHM.5Z.0.25W 
(R7844 ONLY) 


01121 


CB4305 


RES. , FXD, CMPSN: 43 OHM,5%,0.25W 
(7844 ONLY) 


01121 


CB4305 


RES . , FXD .FILM: 800 0HM,0. 5% ,0 . 50W 
(R7844 ONLY) 


91637 


MFF1226G800R0D 


RES. , FXD, FILM: 800 OHM , 0 . 5Z ,0 . 50W 
(7844 ONLY) 


91637 


MFF1226G800R0D 


RES., FXD, CMPSN: 10 0HM,5%,0.25W 
(R7844 ONLY) 


01121 


CB1005 


RES., FXD, CMPSN: 10 OHM,5%,0.25W 
(7844 ONLY) 


01121 


CB1005 


RES., FXD, FILM: 150 OHM, 1Z,0. 125W 
(R7844 ONLY) 


91637 


MFF1816G150R0F 


RES., FXD, FILM: 150 OHM,1Z,0.125W 
(7844 ONLY) 


91637 


MFF1816G150R0F 


RES . , FXD, CMPSN : 22 OHM,5Z,0.25W 
(R7844 ONLY) 


01121 


CB2205 


RES., FXD, CMPSN: 22 OHM,5Z,0.25W 
(7844 ONLY) 


01121 


CB2205 


RES., FXD, CMPSN: IK OHM,5%,0.25W 
(R7844 ONLY) 


01121 


CB1025 


RES., FXD, CMPSN: IK OHM,5%,0.25W 
(7844 ONLY) 


01121 


CB1025 



8-108 



REV OCT 1981 





Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 

Ckt No. Part No. Eff Oscont Name & Description 



Mfr 

Code Mtr Part Number 



R4851 


321-0066-00 


XB100000 


R4851 


321-0066-00 


XB110000 


R4852 


321-0205-00 


XB100000 


R4852 


321-0205-00 


XB 11 0000 


R4853 


321-0285-00 


XB100000 


R4853 


321-0285-00 


XB1 10000 


R4855 


323-0706-01 


XB100000 


R4855 


323-0706-01 


XB1 10000 


R4856 


315-0100-00 


XB100000 


R4856 


315-0100-00 


XB 11 0000 


R4857 


321-0114-00 


XB100000 


R4857 


321-0114-00 


XB1 10000 


R4858 


315-0220-00 


XB100000 


R4858 


315-0220-00 


XB 11 0000 


R4859 


315-0822-00 


XB100000 


R4859 


315-0822-00 


XB 110000 


R4860 


315-0102-00 


XB100000 


R4860 


315-0102-00 


XB1 10000 


R4861 


321-0066-00 


XB 100000 


R4861 


321-0066-00 


XB 110000 


R4862 


321-0205-00 


XB 100000 


R4862 


321-0205-00 


XB 110000 


R4863 


321-0278-00 


XB 100000 


R4863 


321-0278-00 


XB 110000 


R4865 


321-0224-00 


XB 100000 


R4865 


321-0224-00 


XB1 10000 


R4866 


321-0258-00 


XB 100000 


R4866 


321-0258-00 


XB 110000 



RES . , FXD, FILM: 47 . 5 OHM, 1Z,0. 125W 
(R7844 ONLY) 

RES . ,FXD,FILM:47 . 5 OHM, 1%,0. 125W 
(7844 ONLY) 

RES . , FXD, FILM: 1 . 33K OHM, 1Z,0. 125W 
(R7844 ONLY) 

RES . , FXD, FILM: 1 . 33K OHM, 1Z,0. 125W 
(7844 ONLY) 

RE S . , FXD , F ILM : 9 . 09K OHM, 1% ,0. 125W 
(R7844- ONLY) 

RES . , FXD .FILM: 9 . 09K OHM, 1Z , 0 . 125W 
(7844 ONLY) 

RES. , FXD, FILM: 800 OHM,0 . 5Z ,0 . 50W 
(R7844 ONLY) 

RES., FXD, FILM: 800 OHM, 0. 5Z , 0 . 50W 
(7844 ONLY) 

RES. ,FXD,CMPSN: 10 OHM, 5% , 0 . 25W 
(R7844 ONLY) 

RES. ,FXD,CMPSN : 10 OHM,5Z,0.25W 
(7844 ONLY) 

RES., FXD .FILM: 150 OHM , 1 Z , 0 . 1 2 5W 
(R7844 ONLY) 

RES., FXD, FILM: 150 OHM, 1%,0. 125W 
(7844 ONLY) 

RES . , FXD,CMPSN: 22 OHM,5%,0.25W 
(R7844 ONLY) 

RES . ,FXD,CMPSN : 22 OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD.CMPSN : 8 . 2K OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD.CMPSN: 8. 2K OHM.5Z.0.25W 
(7844 ONLY) 

RES. , FXD.CMPSN: IK OHM,5%,0.25W 
(R7844 ONLY) 

RES., FXD.CMPSN: IK OHM,5%,0.25W 
(7844 ONLY) 

RES . , FXD .FILM : 47 . 5 OHM, 1%,0. 125W 
(R7844 ONLY) 

RES . ,FXD , FILM: 47 . 5 OHM, 1Z,0. 125W 
(7844 ONLY) 

RES . , FXD .FILM: 1 . 33K OHM, 1%,0. 125W 
(R7844 ONLY) 

RES., FXD, FILM: 1.33K OHM, 1Z , 0 . 125W 
(7844 ONLY) 

RES . , FXD .FILM: 7 . 68K OHM, 1Z , 0 . 125W 
(R7844 ONLY) 

RES . , FXD, FILM : 7 .68K OHM, 1Z , 0 . 1 25W 
(7844 ONLY) 

RES. , FXD, FILM: 2 . IK OHM, 1Z ,0. 125W 
(R7844 ONLY) 

RES. , FXD, FILM: 2. IK OHM , 1Z , 0. 1 25W 
(7844 ONLY) 

RES . , FXD ,FILM:4 . 75K OHM, 1Z,0. 125W 
(R784‘* ONLY) 

RES. , FXD, FILM :4. 75K OHM, 1Z,0. 125W 
(7844 ONLY) 



91637 


MFF1816G47R50F 


91637 


MFF1816G47R50F 


91637 


MFF1816G13300F 


91637 


MFF1816G1 3300F 


91637 


MFF1816G90900F 


91637 


MFF1816G90900F 


91637 


MFF1226G800R0D 


91637 


MFF1226G800R0D 


01121 


CB1005 


01121 


CB1005 


91637 


MFF1816G150R0F 


91637 


MFF1816G150R0F 


01121 


CB2205 


01121 


CB2205 


01121 


CB8225 


01121 


CB8225 


01121 


CB1025 


01121 


CB1025 


91637 


MFF1816G47R50F 


91637 


MFF1816G47R50F 


91637 


MFF1816G13300F 


91637 


MFF1816G13300F 


91637 


MFF1816G76800F 


91637 


MFF1816G76800F 


91637 


MFF1816G21000F 


91637 


MFF1816G21000F 


91637 


MFF1816G47500F 


91637 


MFF181 6G47500F 



REV OCT 1981 



8-109 



Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 

Ckt No. Part No. Eft Dscont Name & Description 



R4869 


321-0163-00 


XB100000 


R4869 


321-0163-00 


XB 11 0000 


R4871 


315-0150-00 


XB 100000 


R4871 


315-0150-00 


XB110000 


R4872 


315-0271-00 


XB100000 


R4872 


315-0271-00 


XB1 10000 


R4873 


315-0100-00 


XB100000 


R4873 


315-0100-00 


XBUOOOO 


R4875 


321-0209-00 


XB 100000 


R4875 


321-0209-00 


XBUOOOO 


R4876 


301-0433-00 


XB 100000 


R4876 


301-0433-00 


xbiioooo 


R4878 


323-0327-00 


XB100000 


R4878 


323-0327-00 


xbiioooo 


R4879 


315-0470-00 


XB100000 


R4879 


315-0470-00 


XBIIOOOO 


R4881 


315-0561-00 


XB100000 


R4881 


315-0561-00 


XBIIOOOO 


R4883 


315-0563-00 


XB 100000 


R4883 


315-0563-00 


XBIIOOOO 


R4888 


323-0251-00 


XB100000 


R4888 


323-0251-00 


XBIIOOOO 


R4889 


321-0193-00 


XB100000 


R4889 


321-0193-00 


XBUOOOO 


R4892 


321-0160-00 


XB100000 


R4892 


321-0160-00 


XBUOOOO 


R4894 


315-0150-00 


XB100000 


R4894 


315-0150-00 


XBUOOOO 


R4895 


321-0196-00 


XB100000 



RES . , FXD ,FILM : 487 OHM, 1%,0. 125W 
(R7844 ONLY) 

RES. , FXD, FILM: 487 OHM, 1%,0. 125W 
(7844 ONLY) 

RES. ,FXD,CMPSN: 15 OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD , CMPSN : 15 OHM,5%,0.25W 
(7844 ONLY) 

RES . , FXD , CMPSN : 270 OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 2 70 OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 10 OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 10 OHM,5%,0.25W 
(7844 ONLY) 

RES. , FXD, FILM: 1 .47K OHM, Vi ,0 . 1 25W 
(R7844 ONLY) 

RES., FXD, FILM: 1.47K OHM, 1%,0. 125W 
(7844 ONLY) 

RES. , FXD, CMPSN :43K OHM, 5% , 0 . 50W 
(R7844 ONLY) 

RES. , FXD, CMPSN :43K OHM,5%,0.50W 
(7844 ONLY) 

RES. , FXD, FILM: 24. 9K OHM, 1% , 0 . 50W 
(R7844 ONLY) 

RES . , FXD, FILM: 24 . 9K OHM, 1X,0. 50W 
(7844 ONLY) 

RES., FXD, CMPSN: 47 OHM, 5% , 0 . 25W 
(R7844 ONLY) 

RES . , FXD, CMPSN : 47 OHM,5%,0.25W 
(7844 ONLY) 

RES . , FXD, CMPSN : 560 OHM, 5% , 0 . 25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 560 OHM,5%,0.25W 
(7844 ONLY) 

RES., FXD, CMPSN : 56K OHM,5%,0.25W 
(R7844 ONLY) 

RES., FXD, CMPSN :56K OHM,5%,0.25W 
(7844 ONLY) 

RES . , FXD , FILM: 4 . 02K 0HM,U,0.50W 
(R7844 ONLY) 

RES . , FXD, FILM : 4 . 02K OHM,U,0.50W 
(7844 ONLY) 

RES., FXD, FILM: IK OHM, 1% , 0 . 125W 
(R7844 ONLY) 

RES. , FXD, FILM: IK OHM, 1%,0. 125W 
(7844 ONLY) 

RES. , FXD, FILM: 453 OHM, 1% , 0 . 125W 
(R7844 ONLY) 

RES. ,FXD,FILM:453 OHM,n,0.125W 
(7844 ONLY) 

RES. , FXD, CMPSN: 15 OHM,5%,0.25W 
(R7844 ONLY) 

RES . ,FXD , CMPSN : 15 0HM,5%,0.25W 
(7844 ONLY) 

RES. , FXE , FILM : 1 . 07K OHM, 1%,0. 125W 
(7844 ONLY) 



Mfr 

Code Mfr Part Number 



91637 


MFF1816G487R0F 


91637 


MFF1816G487R0F 


01121 


CB1505 


01121 


CB1505 


01121 


CB2715 


01121 


CB2715 


01121 


CB1005 


01121 


CB1005 


91637 


MFF1816G14700F 


91637 


MFF1816G14700F 


01121 


EB4335 


01121 


EB4335 


91637 


MFF1226G24901F 


91637 


MFF1226G24901F 


01121 


CB4705 


01121 


CB4705 


01121 


CB5615 


01121 


CB5615 


01121 


CB5635 


01121 


CB5635 


91637 


MFF1226G40200F 


91637 


MFF1226G40200F 


91637 


MFF1816G10000F 


91637 


MFF1816G10000F 


91637 


MFF1816G453R0F 


91637 


MFF1816G453R0F 


01121 


CB1505 


01121 


CB1505 


91637 


MFF1816G10700F 



8-110 



REV OCT 1981 





Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 

Ckt No. Part No. Eff Dscont Name & Description 



Mfr 

Code Mfr Part Number 



R4895 


321-0196-00 


XB 11 0000 


R4896 


303-0223-00 


XB 100000 


R4896 


303-0223-00 


XB1 10000 


R4898 


323-0327-00 


XB100000 


R4898 


323-0327-00 


XB1 10000 


R4899 


315-0470-00 


XB100000 


R4899 


315-0470-00 


XB110000 


R4976 


311-1252-00 


XB100000 


R4976 


311-1252-00 


XB 11 0000 


R4977 


315-0680-00 


XB100000 


R4977 


315-0680-00 


XB1 10000 


R4983 


315-0680-00 


XB 100000 


R4983 


315-0680-00 


XB110000 


R4985 


311-1252-00 


XB100000 


R4985 


311-1252-00 


XB 110000 


R4986 


307-0103-00 


XB100000 


R4986 


307-0103-00 


XB1 10000 


R4987 


315-0104-00 


XB100000 


R4987 


315-0104-00 


XB 11 0000 


R4988 


311-1252-00 


XB100000 


R4988 


311-1252-00 


XB1 10000 


R4989 


315-0390-00 


XB100000 


R4989 


315-0390-00 


XB110000 


R5802 


321-0079-00 


XB100000 


R5802 


321-0079-00 


XB1 10000 


R5803 


315-0822-00 


XB100000 


R5803 


315-0822-00 


XB110000 


R5804 


311-1228-00 


XB 100000 



RES. ,FXD, FILM: 1.07K OHM, 1%,0. 125W 
(7844 ONLY) 

RES . , FXD , CMPSN : 22K 0HM,5%,1W 
(R7844 ONLY) 

RES . , FXD.CMPSN : 22K 0HM,5%,1W 
(7844 ONLY) 

RES. , FXD.FILM: 24 ,9K 0HM,1%,0.50W 
(R7844 ONLY) 

RES. , FXD.FILM : 24. 9K OHM,1%,0.50W 
(7844 ONLY) 

RES . , FXD,CMPSN :47 OHM,5%,0.25W 
(R7844 ONLY) 

RES. ,FXD,CMPSN:47 OHM,5%,0.25W 
(7844 ONLY) 

RES . , VAR, NONWIR : 500K OHM, 20% ,0 . 50W 
(R7844 ONLY) 

RES . , VAR, NONWIR : 500K OHM, 20% , 0 . 50W 
(7844 ONLY) 

RES . , FXD , CMPSN : 68 OHM,5%,0.25W 
( R7844 ONLY) 

RES . ,FXD,CMPSN : 68 OHM,5%,0.25W 
(7844 ONLY) 

RES. ,FXD,CMPSN:68 OHM,5%,0.25W 
(R7844 ONLY) 

RES . ,FXD ,CMPSN : 68 OHM,5%,0.25W 
(7844 ONLY) 

RES. , VAR, NONWIR : 500K OHM, 20% ,0 . 50W 
(R7844 ONLY) 

RES. , VAR, NONWIR: 500K OHM, 20% , 0. 50W 
(7844 ONLY) 

RES . , FXD.CMPSN : 2 . 7 OHM,5%,0.25W 
(R7844 ONLY) 

RES . , FXD, CMPSN : 2 . 7 OHM,5%,0.25W 
(7844 ONLY) 

RES. „FXD, CMPSN: 100K OHM,5%,0.25W 
( R7844 ONLY) 

RES. „FXD, CMPSN: 100K 0HM,5%,0.25W 
(7844 ONLY) 

RES. ., VAR, NONWIR: 500K OHM, 20% , 0 . 50W 
(R7844 ONLY) 

RES. , VAR, NONWIR: 500K OHM, 20% ,0. 50W 
(7844 ONLY) 

RES. , FXD, CMPSN: 39 OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD.CMPSN: 39 OHM,5%,0.25W 
(7844 ONLY) 

RES. .FXD.FILM: 64. 9 OHM, 1%,0. 123W 
( R7844 ONLY) 

RES . , FXD, FILM: 64 . 9 OHM, 1% ,0 . 125W 
(7844 ONLY) 

RES., FXD, CMPSN: 8. 2K OHM,5%,0.25W 
(R7844 ONLY) 

RES. , FXD, CMPSN: 8. 2K OHM,5%,0.25W 
(7844 ONLY) 

RES. , VAR, NONWIR : 1 OK OHM, 20% , 0 . 50W 
(R7844 ONLY) 



91637 


MFF1816G10700F 


01121 


GB2235 


01121 


GB2235 


91637 


MFF1226G24901F 


91637 


MFF1226G24901F 


01121 


CB4705 


01121 


CB4705 


32997 


3386F-T04-504 


32997 


3386F-T04-504 


01121 


CB6805 


01121 


CB6805 


01121 


CB6805 


01121 


CB6805 


32997 


3386F-T04-504 


32997 


3386F-T04-504 


01121 


CB27G5 


01121 


CB27G5 


01121 


CB1045 


01121 


CB1045 


32997 


3386F-T04-504 


32997 


3386F-T04-504 


01121 


CB3905 


01121 


CB3905 


91637 


MFF1816G64R90F 


91637 


MFF1816G64R90F 


01121 


CB8225 


01121 


CB8225 


32997 


3386F-T04-103 



REV OCT 1981 



8-111 



Replaceable Electrical Parts — 7844/R7844 Service 



Tektronix Serial/Model No. 

Ckt No. Part No. Eft Dscont Name & Description 



R5804 


311-1228-00 


XB1 10000 


R5805 


315-0822-00 


XB100000 


R5805 


315-0822-00 


XB110000 


R5806 


323-0168-00 


XB100000 


R5806 


323-0168-00 


XB110000 


R5807 


315-0223-00 


XB 100000 


R5807 


315-0223-00 


XB 110000 


R5808 


315-0222-00 


XB100000 


R5808 


315-0222-00 


XB1 10000 


R5809 


311-1223-00 


XB100000 


R5809 


311-1223-00 


XB 11 0000 


R5810 


321-0205-00 


XB100000 


R5810 


321-0205-00 


XB110000 


R5811 


321-0253-00 


XB100000 


R5811 


321-0253-00 


XB110000 


R5812 


323-0168-00 


XB100000 


R5812 


323-0168-00 


XB 110000 


R5814 


321-0079-00 


XB100000 


R5814 


321-0079-00 


XB1 10000 


R5815 


321-0287-00 


XB100000 


R5815 


321-0287-00 


XB110000 


R5816 


311-1225-00 


XB100000 


R5816 


311-1225-00 


XB110000 


R5818 


321-0205-00 


XB100000 


R5818 


321-0205-00 


XB110000 


R5819 


321-0124-00 


XB100000 


R5819 


321-0124-00 


XB1 10000 


R5820 


311-1222-00 


XB100000 


R5820 


311-1222-00 


XB1 10000 



RES . , VAR, NONWIR : 10K OHM, 202 ,0 . 50W 
(7844 ONLY ) 

RES . , FXD , CMPSN : 8 . 2K OHM,5%,0.25W 
(R7844 ONLY) 

RES . ,FXD , CMPSN: 8 . 2K OHM,5Z,0.25W 
(7844 ONLY) 

RES. ,FXD, FILM: 549 0HM,1%,0.50W 
(R7844 ONLY) 

RES. ,FXD, FILM: 549 OHM,12,0.50W 
(7844 ONLY) 

RES., FXD, CMPSN :22K OHM,5Z,0.25W 
( R7844 ONLY) 

RES. , FXD, CMPSN :22K OHM,5Z,0.25W 
(7844 ONLY) 

RES. , FXD, CMPSN: 2. 2K OHM,52,0.25W 
(R7844 ONLY) 

RES., FXD, CMPSN: 2. 2K 0HM,5%,0.25W 
(7844 ONLY) 

RES . , VAR, NONWIR : TRMR, 250 OHM.0.5W 
(R7844 ONLY) 

RES . , VAR, NONWIR : TRMR, 250 OHM.0.5W 
(7844 ONLY) 

RES. , FXD, FILM: 1.33K OHM, 12,0. 125W 
(R7844 ONLY) 

RES. , FXD, FILM: 1.33K OHM, 12,0. 125W 
(7844 ONLY) 

RES . , FXD, FILM: 4 . 22K OHM, 12,0. 125W 
(R7844 ONLY) 

RES. , FXD.FILM: 4 . 22K OHM, 12,0. 125W 
(7844 ONLY) 

RES. , FXD, FILM: 549 OHM,1Z,0.50W 
(R7844 ONLY) 

RES. , FXD, FILM: 549 OHM,12,0.50W 
(7844 ONLY) 

RES . , FXD , FILM : 64 . 9 OHM, 12 , 0 . 125W 
(R7844 ONLY) 

RES . ,FXD , FILM: 64 . 9 OHM, 12 , 0 . 125W 
(7844 ONLY) 

RES . , FXD, FILM: 9 . 53K OHM, 1% , 0. 125W 
(R7844 ONLY) 

RES . ,FXD , FILM: 9 . 53K OHM, 12 , 0 . 125W 
(7844 ONLY) 

RES. , VAR, NONWIR: IK OHM, 20% , 0 . 50W 
(R7844 ONLY) 

RES .