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Apple Service 
Technical Procedures 
Cross Family Peripherals 
\t)liime Three 



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Apple Service 
Technical Procedures 
Cross Family Peripherals 

Volume Three 



PN: 072-0230 

(Cross Family Not Sold Separately) 



fk Apple Technical Procedures 



Cross Family Peripherals 

Volume Three 

Table of Contents 

—Title page (contains build date) 



ImageWrlter LQ --Table of Contents 08/89 

-Basics 03/88 

(except page 1.23-1.28) 11/90 
(except pages 1.10, 1.14-1.18, 1.20, 

1.23-1.24) 12/87 

(except pages 1.11, 1.13, 1.26) 11/88 

(except pages 1.12, 1.25, 1.27, 1.28) 05/88 

-Take-Apart 11/87 
(except pages 2.2-2.4, 2.17-2.19, 

2.28-2.30,2.48-2.63) 06/88 

(except pages 2.1, 2.32-2.41) 02/89 

(except pages 2.50-2.53) 04/89 

-Adjustments 04/89 

-Troubleshooting 05/88 

(except page 4.7) 11/88 

(except pages 4.1, 4.9, 4.10) 04/89 

(except page 4.12) 07/89 

-Diagnostics 03/89 

-Additional Procedures 04/88 

(except pages 7.1, 7.12) 11/88 

(except pages 7.10, 7.11) 08/88 

(except page 7.13) 08/89 

—Preventive Maintenance 12/87 

-Rework 03/89 

-Illustrated Parts List 07/88 
(except pages IPL.2, IPL.4, IPL.5, 
IPL.7, IPL.IO, IPL.ll, IPL.29, IPL.30, 

IPL.31) 04/89 
(except pages IPL.22, IPL.26, 

IPL.28) 06/89 

(except page IPL.l) 07/89 

(except pages IPL.20, IPL.23) 08/89 

(except pages IPL.14, IPL.16, IPL.17) 04/90 

(except pages IPL.8, IPL.9) 07/90 
(except pages IPL.3, IPL.12, IPL.13 

IPL.15, IPL.21, IPL.27) 03/91 

-SheetFeeder Illustrated Parts List 11/87 

(except pages SF-IPL.6-SF-IPL.7) 02/88 

' (except pages SF-IPL.4, SF-IPL.5) 12/88 



# Apple Technical Procedures 

ImageWriter LQ 

Technical Procedures 



□ TABLE OF CONTENTS 



Section 1 - 1.3 Inlroduclion 

Basics 1.3 I'ca Lures 



1.4 Setup 

1.4 Power On and Off 

1.5 Load and Remove Paper 
1.14 Install the Ribbon Cartridge 
l.l6 Remove the Ribbon Cartridge 

1.16 Software, Cables, and Switches 

1.17 Control Panel 

1.17 Power Indicator Light 

1.18 Error Indicator Light 

1.19 Select Button and Indicator Light 

1.20 Print Quality Button and Indicator Light 

1.21 Line Feed Button 

1.21 I'orm Feed Button 

1.22 Options 

1.22 Applelalk Card 

L.2^ Cut Sheet Feeder 



1.23 Configuration DIP Swi.tches 

1.24 Iniernalional Character Sets 

1.24 Form Length 

1.25 Skip Perforation 

1.25 Initial Character Pitch 

1.25 (;arrier Return Function 

1.26 Asynchronous Baud Rate 
1.26 Asynchronous Protocol 

1.26 Option Board 

1.27 Cut Sheet Feeder 

1.27 Color Ribbon Home Position 

1.28 Character Alignment Adjustment 

1.29 Theory of Operation 

1.29 Overview 

1.30 Power Supply 

1.31 Main Logic T^oard 

1.32 iMechanical Operation 
1.34 I5lock Diagram 



Section 2- 2.3 Front Cover 

Take-Apart 2.5 Rear Cover 

2.6 Main Cover 

2.9 Control Panel PCA and Cable 

2.10 Option Card Cable 

2.11 Tractor Block 

2.13 Right Tractor Assembly 

2.14 Left Tractor Assembly 

2.15 Card Guide 

2.16 Print Head 

2.18 Print Head to Relay PCB Cable 

2.20 Platen Assembly 

2.22 Pinch Roller Assembly 

2.24 Paper-Out Sensor 

2.27 Tractor Drive Gear 

2.27 Cassette Latch 

2.28 Main Board 

2.31 Fuses 

2.32 Power Supply Assembly 

2.32 AC Power Switch 

2.33 Transformer/Noise Filter PCA Assy Bracket 

2.36 Transformer 

2.37 Universal Transformer 

2.39 Noise Filter PCA 

2.40 Home Position Switch 
2.42 Cut Sheet Feeder Switch 
2.44 Carrier Drive Motor 
2.46 Auto-Load Solenoid 
2.48 Mechanical Assembly 

2.55 Paper-Detect Switch 

2.56 Color Ribbon Motor Assembly 

2.59 Paper Feed Motor 

2.60 Gear Linkage Assembly 
2.62 Option Card 



Section 3 - 3.3 Print Head Gap 

Adjustments 3.6 Platen Gap and Parallelism 

3.10 Card Guide 

3.12 Color Ribbon Home Position 

3.14 Color Ribbon Parallelism 

3.16 Horizontal Registration 

3.18 Home Position Switch 



Section 4 - 
Troubleshooting 



4.3 Introduction 

4.3 Before You Start 

4.3 How to Use the Symptom/Cure Chart 

4.4 Preliminary Checks 
4.4 Printer 

4.7 Cut Sheet Feeder 

4.9 Symptom/Cure Chart 

4.9 Power Problems 

4.9 Communication Problems 

4.9 Paper Feed Problems 

4.10 Carrier Problems 

4.11 Printing Problems 

4.12 Color Printing Problems 

4.12 Other Problems 

4.13 Testing the Primary and Secondary Fuses 

4.13 Testing the Power Switch 

4.14 Testing the Home Position Switch 

4.15 Testing the Carrier Drive Motor 

4.16 Testing the Paper-Handling Change Switch 

4.17 Testing the Paper Feed Motor 

4.18 Testing the Auto-Load Solenoid 
4.18 Testing the Paper-Out Sensor 
4.20 Testing the Cover-Open Sensor 

4.20 Testing the Color Ribbon Detect Switch 

4.22 Testing the Color Ribbon Home Position Switch 

4.23 Testing the Color Ribbon Motor 

4.24 Testing the Control Panel Switches 



Section 5 - 
Diagnostics 



5.2 Introduction 

5.2 Test Descriptions 

5.3 Printer Configuration 

5.4 Keyboard Equivalents 

5.4 Tips for Using PrintTest LQ 

5.4 Control Panel Switch Reference 

5.5 Equipment Setup 

5.5 Printer Setup 

5.6 Computer Setup 

5.7 Main Logic Board Test 

5.8 Carrier Movement Test 

5.9 Print Pins Test 

5.10 Print Test - Narrow 
5.12 Print Test - Wide 

5.15 Horizontal Registration Test 



Section 6 - 

Preventive 

Maintenance 



Section 7 - 

Additional 

Procedures 



Section 8 - 
Rework 



6.3 Maintenance Schedule 

6.4 Getting Started 

6.5 As-Needed Maintenance 

6.6 Six-Month Maintenance 

6.8 After-Take-Apart Maintenance 
6.8 Introduction 
6.8 Right- and Left-Side Frame 

6.10 Pinch Roller 

6.12 Ribbon Clutch Gear 

6.13 Tractor 

6.14 Platen and Paper-out Sensor 
6.16 Carrier 



7.3 Interrupter Switch Modification 

7.3 Materials Required 

7.4 Remove Home Position Switch 

7.5 Remove Stepper Motor Screws 

7.5 Install Position Sensor Assembly 

7.6 Install Interrupter 

7.8 Install Ribbon Lift Bail Clip 

7.9 Adjustment Check 

7.10 Cut Sheet Feeder 

7.10 Gear Configuration Plug 

7.12 Expansion Bin Bumper Placement 

7.13 Voltage Conversion 



8.2 Introduction 

8.2 Domestic Rework • 

8.3 International Rework 

8.3 Materials Required 

8.4 International Installation Procedures 
8.4 Remove Covers 

8.6 Install New ROM 

8.7 Remove Card Guide 

8.8 Remove Tractor Assembly 

8.9 Remove Platen 

8.11 Remove Paper Pan Subassembly 

8.12 Install New Deflector Plates and Stop Plate 



8.13 
8.14 
8.15 
8.17 
8.18 
8.19 



Springs 

Install New Paper Pan Subassembly 
Install New Paper Deflector Springs 
Replace Platen 

Install New Paper Pan on Tractor Assembly 
Replace Tractor Assembly 
Install Sound-Damping Material 



8.20 Replace Covers 

8.22 Install New Platen Knob and Wire Form 
Assembly 

8.22 Install Card Guide 

8.23 Perform Card Guide Adjustment 

8.25 Install New Bottom Mylar Sheet and Label 

8.27 Perform Self-Test 

8.28 Perform Horizontal Registration Test 
8.30 Rework Symptom/Cure Chart 



Illustrated 
Parts List 



IPL.2 Miscellaneous Hardware Kit 

IPL.3 Rework Kit 

IPL.5 Assembly Location (Figure 1) 

IPL.7 Top Cover Assembly (Figure 2) 

IPL.9 Tractor Feed Assembly (Figure 3) 

IPL.ll Platen Assembly (Figure 4) 

IPL.13 Print Head/Carriage Assembly (Figure 5) 

IPL.15 Main Frame Assembly (Figure 6) 

IPL.17 Left Side Frame Assembly (Figure 7) 

IPL.19 Right Side Frame Assembly (Figure 8) 

IPL.21 Power Supply and Main PCB Assembly (Figure 

IPL.23 Main Board Fuses (Figure 10) 

IPL.25 Cables (Figure 11) 

IPL.27 Paper Pan Subassembly (Figure 12) 

IPL.29 Wire Form Assembly (Figure 13) 

IPL.3 1 Tool (Figure 14) 



SheetFeeder 
llustrated 
Parts List 



SF-IPL.3 Cut SheetFeeder (Figure 1) 

SF-IPL.3 Forward Collator Assembly (Figure 2) 

SF-IPL.5 Single Bin (Figure 3) 

SF-IPL.5 Extension (Figure 4) 

SF-IPL.7 Envelope Hopper (Figure 5) 



©Apple Computer, Inc., 1987, 1988, 1989. No portion of this document may be reproduced in 
any form without the written permission of Apple Computer, Inc. 

Macintosh, Image Writer, AppleTalk, Apple, and the Apple logo are registered trademarks of 
Apple Computer, Inc. 



# Apple Technical Procedures 

ImageWriter LQ 

Section 1 - Basics 



□ CONTENTS 



1.3 


Introduction 


1.3 


Features 


1.4 


Setup 


1.4 


Power On and Off 


1.5 


Load and Remove Paper 


1.14 


Install the Ribbon Cartridge 


1.16 


Remove the Ribbon Cartridge 


1.16 


Software, Cables, and Switches 


1.17 


Control Panel 


1.17 


Power Indicator Light 


1.18 


Error Indicator Light 


1.19 


Select Button and Indicator Light 


1.20 


Print Quality Button and Indicator Light 


1.21 


Line Feed Button 


1.21 


Form Feed Button 


1.22 


Options 


1.22 


AppleTalk Card 


1.22 


Cut Sheet Feeder 


1.23 


Configuration DIP Switches 


1.24 


International Character Sets 


1.24 


Form Length 


1.25 


Skip Perforation 


1.25 


Initial Character Pitch 


1.26 


Carrier Return Function 


1.26 


Asynchronous Baud Rate 


1.26 


Asynchronous Protocol 


1.27 


Option Board 


1.27 


Cut Sheet Feeder 


1.28 


Color Ribbon Home Position 


1.29 


Theory of Operation 


1.29 


Overview 


1.30 


Power Supply 


1.31 


Main Logic Board 


1.32 


Mechanical Operation 


1.34 


Block Diagram 



) □ INTRODUCTION 



Features The Apple ImageWriter LQ is a wide-carriage dot 

matrix impact printer. The following list details its 
features. 

Multiple Fonts 

• Five built-in fonts 

• Times, Helvetica, Courier, and Symbol font 
families provided on disk for the Macintosh 

Printing Speeds 

• Draft (fixed width) - 250 characters per second 
maximum 

• Near Letter Quality - 145 characters per second 
maximum 

• Letter Quality - 115 characters per second 
maximum 

Paper Handling 

Push or pull tractor for pin-feed paper 
Pull tractor for labels, heavy stock, and 
multipart forms 

Paper switching — from pin-feed to single 
sheet — without unloading 
Automatic paper loading and paper backout 

Color Capability 

• Provides seven-color printing with a four-color 
ribbon 

Options 

• Cut Sheet Feeder - Available with one, two, or 
three-bins plus an envelope feeder 

• ImageWriter II/LQ AppleTalk Option - Allows 
the ImageWriter LQ to be used on the AppleTalk 
network 



Self-Identification 



• The printer automatically determines its 
operational mode by checking to see if there is a 
color ribbon, a sheet feeder, or an option card 
installed 

Interface 

• RS 422/423 

• 7 or 8 data bits 

• DTR hardware or XON/XOFF software 
handshaking 



□ SETUP 

Power On l. Make sure the printer is turned off (Figure 1, #1). 

and Off 




FIGURE 1 

2. Connect the power cord to the printer 
(Figure 1, #2). 

3. Plug the power cord into an electrical outlet. 



4. Turn on the printer. 

5. Check the control panel. Make sure the green 
Power and Print Quality lights come on. 

Note: The red Error indicator light will also come 
on because no paper has been loaded yet. 

6. Turn off the printer. 

Paper can be loaded into the ImageWriter LQ using one 
of five methods. Table 1 lists each of the five methods. 
Two of the five methods — single sheet and push 
tractor — will be briefly covered here. Refer to the 
ImageWriter LQ Owner's Guide for detailed procedures 
on how to use each paper-loading method. 



ImageWriter LQ Paper Feeder Options 


Method 


Paper 


Feed In 


Feed Out 


Push Tractor 


Pin Feed 
Regular 


Rear 


Top Slot 


Pull Tractor 


Pin Feed 
Regular 


Bottom 


Rear 


Pull Tractor 


Pin Feed 
Regular 


Rear 


Rear 


Pull Tractor 


Pin Feed 
Forms/Labels 


Bottom 


Rear 


Single Sheet 


Single Sheet 


Behind 
Platen 


Top Slot 



TABLE 1 



The single-sheet and push tractor methods of loading 
paper both require that the tractor block be placed in 
the "push" position. If the tractor is not in the "push" 
position, perform the following procedure. 




FIGURE 2 

1. Turn off the printer (Figure 2, #1). 

2. Open the front cover (Figure 2, #2) and then the 
rear cover (Figure 2, #3). 




FIGURE 3 



3. Set the tractor block to the "push" position as 
follows: 

a) Push both the right (Figure 3, #1) and left blue 
tractor levers toward the back of the printer to 
release the tractor. 

b) With your thumbs on the middle of the tractor 
shaft (Figure 3, ^2), lift up slightly, then push 
down and toward the rear of the printer until 
the tractor block locks in place. 

c) Pull both the right and left blue tractor levers 
forward and then push them down to lock. 



Friction Feed 
Paper Loading 



1. If you have not already done so, set the tractor 
block to the "push" position. 




FIGURE 4 



Push the left (Figure 4, #1) and right tractor 
release levers toward the back of the printer. 

Move the left tractor to the extreme left side of the 
printer and then move the right tractor to the 
extreme right side of the printer. 

Lock the tractors in place by pulling the tractor 
release levers forward and then down. 

Move the paper guide (Figure 4, #2) until it is 
approximately one third of the way from the left 
side of the printer. 

Close the rear cover (Figure 4, #3) and then the 
front cover (Figure 4, #4). 

Push the friction release lever (Figure 4, #5) 
toward the back of the printer to the friction feed 
position. 



FIGURES 



8. Lift up and pull forward on the cut sheet guide 
(Figure 5, #1) until it stops. 

9. Insert a sheet of paper into the printer 
(Figure 5, #2) in front of the cut sheet guide, 
aligning it with the mark on the cut sheet guide. 
Slide the paper into the printer until it stops. 

10. Turn on the printer (Figure 5, #3). 

11. Press the form feed button on the printer control 
panel (Figure 5, #4). The printer will automatically 
load the paper to the print start position. 



Friction Feed 1. Turn on the printer 

Paper Removal 

2. Press the select button. The select button 
indicator light will turn off. 



3. Press the form feed button to remove the sheet of 
paper. 



Push Tractor 
Paper Loading 



1. If you have not already done so, set the tractor 
block to the "push" position. 




FIGURE 6 

2. Pull the paper-feed lever (Figure 6, #1) toward the 
front of the printer, to the tractor feed position, 
until it stops. 

3. If present, remove the paper separator 
(Figure 6, #2). 

4. Pull the paper bail forward (Figure 6, #3). 

5. Slide, by hand, the carrier assembly (Figure 6, #4) 
to the center of the platen. 

6. Insert the pin feed paper into the paper slot at the 
back of the printer (Figure 6, #5). 



RGURE7 



7. Load the paper onto the tractor pins (see Figure 7). 

a) Push both the right and left blue tractor levers 
(Figure 7, #1) toward the back of the printer to 
release the tractors. 

b) Pull open the left (Figure 7, #2) and right paper 
clamps. 

c) Place the lead sheet of paper so that the top 
three pins of the left tractor poke through the 
first three pin holes. Close the left paper clamp. 

d) Locate the pin-feed alignment icon (Figure 7, #3) 
toward the rear of the printer case, and the pin- 
feed alignment notch (Figure 7, #4) at the back 
edge of the printer. Slide the left tractor until 
the paper edge aligns with the icon groove and 
the notch. 

e) Pull the left blue tractor lever toward the front 
of the printer to lock the tractor in place. 

Place the paper on the first three pins of the 
right tractor, and close the right paper clamp. 

g) Move the right tractor away from the left tractor 
until the paper lies flat, with no wrinkles. Pull 
the right blue tractor lever toward the front of 
the printer to lock the tractor in place. 



FIGURE 8 



8. Rotate the platen knob (Figure 8, #2) until the next 
sheet of the fan-fold paper is in the print position. 

9. Push the paper bail (Figure 8, #1) toward the back 
of the printer until it rests on the paper. 

10. Close the rear cover (Figure 8, #3) and then the 
front cover (Figure 8, #4). 



Push Tractor l. Make sure the printer is turned off (Figure 8, #5). 

Paper Removal 

2. Check to be sure that the friction release lever 
(Figure 8, #6) is set to "tractor feed." 



3. Turn the platen knob (Figure 8, #2) to back out the 
paper. 



Install the l. Turn on the printer and let it cycle through 

Ribbon Cartridge the print-head movement. 

2. Turn off the printer. 




FIGURE 9 



3. Open the back cover (Figure 9, #2) and then the 
front cover (Figure 9, #1) of the printer. 

4. Locate the ribbon knob on top of the ribbon 
cartridge (Figure 9, #3). 

5. Holding the ribbon cartridge top side up, lower it 
into position in the printer (Figure 9, #4). 

6. Gently press on the cartridge so that the tabs on 
both ends (Figure 9, ^5) snap into place. 

7. Slide the two plastic tubes of the ribbon clip-in 
guide onto the metal rods (Figure 9, #6). Gently 
press down on the clip-in guide until it snaps into 
place. 

8. Turn the ribbon knob on top of the cartridge to the 
right (clockwise) to remove any slack in the ribbon 
(Figure 9, #3). 



9. 



Close the front cover and then the rear cover. 



Remove the l. Make sure the printer is turned off. 

Ribbon Cartridge 




RIBBON 
RODS 

FIGURE 10 

2. Open the back cover (Figure 10, #2) and then the 
front cover (Figure 10, #1) of the printer. 

3. Gently lift up one end of the ribbon cartridge and 
then the other until it unsnaps from the printer 
(Figure 10, #3). 

4. Gently pull up on the ribbon clip-in guide 
(Figure 10, #4) until it is free from the metal rods. 

5. Follow the instructions in "Install the Ribbon 
Cartridge" to install a new ribbon. 



Software, Cables, 
and Switches 



Refer to the ImageWriter LQ Owner's Guide for 
detailed directions on installing software and cables 
and setting peripheral switches. 



□ CONTROL PANEL 



The Control panel contains four buttons and four 
indicator lights (see Figure 11). 



error ^^^^ 



select 

i I 



$$$§$$^^ print quality 



line feed 
I I 

form feed 
I I 

paper load 
eject 



FIGURE 11 



Power Indicator 
Ught 



The power indicator light comes on when you turn on 
the printer and stays on until you turn off the printer. 



Error Indicator 
Ught 



Errors are indicated by the error indicator light (red 
light) lighting up three different ways: on continuously, 
blinking steadily, and blinking irregularly (see Figure 12). 



ON Continuously 



Blinking Steadily 



Blinking Irregularly 



FIGURE 12 



On continuously 

• The printer has run out of paper. Load the 

appropriate paper and press the select button to 
continue. 



• Dark paper has been loaded, or a form with a 
black band on the back left side has been loaded. 
In both cases, the paper-out sensor interprets 
this as if no paper is loaded. Simply press the 
select button to continue printing. 



Blinking steadily 



• The front cover of the printer is not completely 
closed. Close the front cover and press the 
select button. 

• The print mechanism may be jammed. Eliminate 
the jam and press the select button to continue. 

Blinking irregularly 

• DIP switch 2-4 is incorrectly set. It must be set 
in the open (back) position if the AppleTalk card 
is not installed and in the closed position if the 
the card is installed. Turn the printer off, 
correct the switch setting, and then turn the 
printer on again. 



Select Button Pressing the select button changes the printer's status 

and Indicator from on-line to off-line or vice-versa. The select button 

Light should also be pressed to clear an error condition (and 

turn the error light ofO after you have corrected the 

problem. 

Place the printer on-line to 



• Print 

• Clear the error light after you have corrected 
the problem 



Place the printer off-line to 



• Change print quality 

• Issue a line feed 

• Issue a form feed 

• Temporarily stop printing in the middle of a 
document 



The print quality button lets you select three different 
levels of print quality — Draft Quality, Near Letter 
Quality, and Letter Quality — for Apple II computers. 
(However, note that software menu selections almost 
always override a print quality button selection.) 

Be sure the select button indicator light is off before 
pressing the print quality button. Press the print 
quality button one, two, or three times to select the 
desired quality of print. 

Draft Quality 

• High-speed printing at 250 characters per 
second. 

• The left half of the print quality indicator light 
becomes lit. 

Near Letter Quality 

• Higher quality printing at 90 characters per 
second. 

• The right half of the print quality indicator light 
becomes lit. 

Letter Quality 

• Highest quality printing at 45 characters per 
second. 

• Both sides of the print quality indicator light 
become lit. 



Print Quality Button 
and Indicator Light 



The line feed button is used to advance paper one 
line at a time. Be sure that the select button indicator 
light is off before pressing the line feed button. 

• Press the line feed button once to advance the 
paper one line. 

• Hold down the line feed button to perform 
repeated (up to four) line feeds with a pause 
between each followed by a form feed. After 
five linefeeds, the printer automatically 
performs a form feed. 

The form feed button is used to advance a whole sheet 
of paper. Be sure that the select button indicator light 
is off before pressing the form feed button. 

Use the form feed button to 

• Advance a whole sheet of paper 

• Load and position paper. Insert the paper so its 
top edge rests against the platen. Press the form 
feed button and the printer will automatically 
load and position the paper on the first print 
line 

• Eject paper. Press the form feed button to eject 
a sheet of paper when the printing finishes 
midpage. 

• Back out pin-feed paper. With the select button 
indicator light on, press both the form feed and 
select buttons at the same time to back out pin- 
feed paper to the normal loading position. With 
the pin-feed paper backed out, you can print on a 
single sheet of paper without having to 
completely remove the pin-feed paper. 



□ OPTIONS 



Two Options are available for the ImageWriter LQ: the 
AppleTalk card and a cut sheet feeder. 



AppleTalk The ImageWriter II/LQ AppleTalk card makes it 

Card possible for one ImageWriter LQ to serve as many as 31 

computers on an AppleTalk network. With the 
ImageWriter II/LQ AppleTalk card, your printer can 
receive data from an AppleTalk Personal Network 
instead of from a single, directly attached computer. 

Refer to the ImageWriter LQ Owner's Guide for 
directions on how to install the AppleTalk card. 



Cut Sheet The ImageWriter LQ Cut Sheet Feeder provides for 

Feeder automatic feeding of letterhead, stationery, and 

envelopes. You can use the Cut Sheet Feeder with one, 
two, or three bin attachments and the envelope 
attachment. Each sheet is fed as it is needed. Printed 
material is automatically collated and stacked. 

Refer to the ImageWriter LQ Owner's Guide for 
directions on how to install the Cut Sheet Feeder. 



□ CONFIGURATION DIP SWITCHES 



The ImageWriter LQ has three 8-pole DIP switches (see 
Figure 13, #1). The DIP switches are used to set 
printing parameters. Tables 2 through 13 indicate the 
functions and settings of the switches. Factory settings 
are indicated in bold. Turn off the printer (see 
Figure 13, #2) before resetting the DIP switches. 

Baud rate and character pitch for the Apple II can only 
be set through use of the DIP switches. All other 
configuration settings are overridden by software menu 
selections. 

Note: DIP switches 3-1 and 3-2 are not used. 




FIGURE 13 



International 
Character Sets 



Eight international character sets are available. Change 
the international character set by selecting the 
appropriate DIP switch setting from Table 2. 



Intemadonal Character Sets 





SWl-1 


SWl-2 


SWl-3 


American 


OFF 


C*F 


OFF 


Italian 


ON 


OFF 


OFF 


Danish 


OFF 


ON 


OFF 


British 


ON 


ON 


OFF 


German 


OFF 


OFF 


ON 


Swedish 


ON 


OFF 


ON 


French 


OFF 


ON 


ON 


Spanish 


ON 


ON 


ON 



TABLE 2 



Form Length This switch selects the form length of continuous-form 

paper (see Table 3). 



Form Length 





SWl-4 


11 Indies 


OFF 


12 Inches 


ON 



TABLE 3 



Perforation 
Skip 



This switch is used to skip the perforation of 
continuous-form paper. When this switch is set to ON, 
the printer skips 0.5 inch above and below the 
perforation (see Table 4). 



CAUTION: This switch must always be set to ON. 



Perforation skip 




swi-5 


Disabled 


OFF 


Enabled 


ON 



TABLE 4 



Initial Character This switch sets the initial character pitch 

Pitch (see Table 5). 



Characters/Dots Per Inch 





SWl-6 


SWl-7 


10 cpi 


OFF 


OFF 


12q>i 


ON 


OFF 


17 cpi 


OFF 


ON 


160 dpi 


ON 


ON 


216 dpi 


ON 


ON 



TABLE 5 



Carrier Return This switch sets the carriage to return-only or to 

Function return-and-perform-a-line-feed (see Table 6). 



AutoLFonCR 





SWl-8 


Disabled 


CMFF 


Enabled 


ON 



TABLE 6 




Asynchronous 
Baud Rate 



This switch sets the baud rate to one of four rates 
(see Table 7). 



Baud Rate 





SW2-1 


SW2-2 


1200 


ON 


OFF 


2400 


OFF 


ON 


9600 


ON 


ON 


19200 


OFF 


OFF 



TABLE 7 



Asynchronous This switch selects the asynchronous protocol 

Protocol (see Table 8). 



Handshaking 





SW2-3 


Hardware (DTO) 


OFF 


X-On/X-Off 


ON 



TABLES 



Option This switch selects the installed option card 

Board (see Table 9). 



Option Card 





SW2-4 


Not installed 


OFF 


Installed 


ON 



TABLE 9 



Cut-Sheet 
Feeder 



This switch selects the number of bins attached to the 
Cut-Sheet Feeder (see Table 10). 



Cut-Sheet & Envelope Feeder Bins 





SW2-5 


SW2-6 


SW2-7 


Bin 1 


OFF 


OFF 


ON 


Bins 1 and 2 


ON 


OFF 


ON 


Bins 1, 2, and 3 


OFF 


ON 


ON 


Bin 1 and envelope 


OPF 


OFF 


orF 


Bins 1, 2, and envelope 


ON 


OFF 


OFF 


Bins 1, 2, 3, and envelope 


ON 


ON 


OFF 



TABLE 10 



Auto Paper This switch sets where the paper will be positioned for 

Load Position printing (see Table 11). 



Auto-Paper Load Position 





SW2-8 


Toprbitline 




To paper bail 


ON 



TABLE 11 



Color Ribbon 
Home Position 



This switch sets the home position of the color ribbon 
(see Table 12). 



Color Rfl>bon Home Position 





SW3-3 


SW3-4 


SW3-5 


shift Ribbon Down 








.78125 mm 


ON 


ON 


OFF 


.46875 mm 


OFF 


ON 


OFF 


.15625 mm 


ON 


OFF 


OFF 


Shift Ribbon Up 








.78125 mm 


ON 


ON 


ON 


.46875 mm 


OFF 


ON 


ON 


.15625 mm 


ON 


OFF 


ON 



TABLE 12 

Note: DIP switch 3 should only be set by a 
technician and never by the user. Switches 3-1 and 
3-2 are not used. 



Character These switches adjust the horizontal alignment for 

Alignment bidirectional printing (see Table 13). 

Adjustment 



Horizontal Registration 





SW3-6 


SW3-7 


SW3-8 


Left Movement 








+0.159 mm 


ON 


ON 


OFF 


+0.106 mm 


OFF 


ON 


OFF 


+0.053 mm 


ON 


OFF 


OFF 


+0.000 mm 


OFF 


OFF 


OFF 


Right Movement 








-0.044 mm 


ON 


ON 


OFF 


-0.088 mm 


OFF 


ON 


OFF 


-0.132 mm 


ON 


OFF 


OFF 


-0.176 mm 


OFF 


OFF 


OFF 



TABLE 13 



when reading over this theory, use the block diagram, 
Figure 14 on page 35, for reference. 

When the power is turned on, the printer performs 
several functions. The reset circuit keeps the printer's 
CPU and gate arrays in a reset state until the logic 
power supply reaches the correct voltage levels. Once 
the correct voltage is reached, the reset state is 
released and the CPU can then begin executing the 
instructions in ROM. Signals are sent out through the 
gate arrays, ICS and IC19, to start the carrier assembly, 
which moves the print head all the way to the left until 
the home position switch is contacted. The switch 
response is sent back to the CPU via the gate arrays; 
the print head is moved to the middle position of the 
carrier and then moved back to the left home position. 

During this positioning of the print head, the platen is 
also rotated forward and then in reverse, to check the 
paper feed motor and gear assembly. During this brief 
period, several other sensors are being monitored, 
including the paper-empty sensor, cut-sheet feeder 
switch, home position sensor, interface signals, and the 
DIP switches. 

If all the information and tests come back to the CPU 
satisfactorily, the printer is put in a ready/wait state, 
and will stay that way waiting for a print signal or for 
some other external condition to happen (for example, 
when the select button, line feed, or paper feed is 
pushed, or the printer is turned ofO. This ready-state 
condition is conveyed to the host computer through IC 
22, the interface driver IC. 

When a print signal is received from the host computer, 
through IC 23, it is processed by the CPU; then the 
necessary information is sent back to the host computer 
to start sending data to the printer. The serial data is 
received through IC 23, the interface receiver, and is 
converted to parallel data in IC 21. The data is then 
stored temporarily in either the working RAM or the 
extra RAM, and from there it is processed by the CPU 
and sent to the gate arrays. Control signals are also 
sent through the gate arrays to move the carrier 



assembly, control the paper feed, control the print head, 
and control the ribbon position (using the ribbon motor 
and position sensor). The data is sent in the form of 
print wire commands via the head drivers, and the 
information is printed. 

During the printing, the CPU is continuously 
monitoring the various sensors and is processing more 
data received from the host computer. The CPU is also 
constantly sending back information that tells the host 
when to send more data or when to stop sending data. 

When there is no more data available, the printing 
process is shut down and the printer returns to the 
ready/wait state. 

The main logic board controls all the functions of the 
printer. However, the printer is an electromechanical 
device; failure of mechanical functions can be caused 
either by an actual failure of the mechanical piece or by 
the controlling signals. You must sometimes isolate the 
two functions (mechanical and electrical) to find a 
problem. But when trying to understand how the 
printer works, you must think of the two functions 
together. 

Following this overview arc additional explanations of 
the various circuits on the main board control and how 
the board operates the mechanical functions of the 
printer. 

Power Supply The power supply provides the following voltages: +30 

VDC, +25 VDC, +5 VDC, and -5 VDC. These voltages are 
used in the following manner in the printer: 

• The +30 voltage is used for the auto-load solenoid, 
and the reset circuit. 

• The +25 voltage is used to drive the circuits that 
operate the print head, ribbon motor, paper feed 
motor, and carrier motor. 

• The +5 voltage is used for the logic circuits. 

• The -5 voltage is used in the interface circuit. 



Main Logic 
Board 



This section discusses the various circuits 

on the board and what their basic functions are. 



Interface Circuit The interface circuit (consisting of ICs 21, 22, 23, and 

connectors CN14 and CN15 on the main logic board) 
controls the transmission of data and the control signals 
between the printer and the host computer. 



CPU 



The CPU is an Intel 80186 microprocessor running with 
a 14 MHz clock. The processor controls all functions of 
the printer. 



Memory 



The printer has 128K bytes of ROM (IC 20) that store 
the printer routine operations and character patterns. 

The printer has 64K bytes of RAM (IC 10 and IC 11), 
which are used as the working area for data input/ 
output and program information. 

Another optional 64K bytes of RAM (ICs 9 and 12) can 
be allocated as data buffers for data that is received 
from the host. 



Print Head Drive 



The print head drive circuit controls the print head pins 
that strike the ribbon and paper. The circuit is made up 
of the head drivers, ICs 1, 2, 3, 4, 5, 6, 7; the head 
signal control, IC 18; and connectors CN 3 and 4. The 
signals driving these drivers are coming from the gate 
arrays (IC 8 and IC 19). The pins are fired (according to 
the data received from the host computer) to form the 
characters and images on the printer paper. 



Carrier Motor Drive The carrier motor drive circuit consists of IC 4 and 

connector CN 5. IC 4 receives the motor phase and 
speed control signals from gate array IC 8. The carrier 
speed is dependent on the print mode being used. 



Paper Feed IC 16 and connector CN 6 are part of the paper feed 

Motor Drive drive circuit that activates the paper feed motor. The 

signals are processed by gate array IC 8. The paper 
feed motor is active during normal operation, during 
automatic paper treading, and when the line feed or 
sheet feed buttons are pressed. 



Ribbon Motor Drive The ribbon motor drive circuit, composed of IC 17 and 

connector CN 7, controls the ribbon motor, which 
drives the color ribbon up and down, allowing the 
printer to print in 4 different colors. 

Auto-Load Solenoid The auto-loading solenoid circuit uses IC 1 and 

transistor Q 6 to develop the drive signals to open or 
close the paper bail during automatic paper loading. 



Mechanical The gate arrays control the carrier movement, print 

Operation head, and the color ribbon motor. The 27 pins on the 

print head are driven independently while the print 

head is in motion. 



Carrier Drive The print head and carrier, attached to the timing belt, 

are moved by the stepping motor. The alignment of the 
print head to the platen is set by the two shafts on 
which the print head/carrier rides. The print head 
location is monitored on the left side of the carriage by 
the home position switch. The normal operation of the 
carriage is bidirectional (that is, printing can occur 
when the carriage is moving in either direction). In a 
heavy-duty cycle where the print wire solenoids get 
too hot, the carriage drive will revert to unidirectional 
(that is, printing in one direction only) to allow the 
print head time to cool off. 



Ribbon Feed The ribbon cartridge is driven by the gear assembly, 

which is part of the carrier drive mechanism. The feed 
direction of the ribbon is left to right, and remains the 
same regardless of the print head direction. 



Ribbon Shift The ribbon cartridge sits on the ribbon shift assembly, 

which consist of a stepper motor, idler gear, ribbon 
guide, and cam gear. The ribbon shift assembly moves 
the ribbon up and down. This movement is used for a 
color ribbon to print in different colors and for a black 
ribbon to print in different bands, resulting in an even 
use of the black ribbon. 



The paper feed assembly consists of the paper feed 
motor, platen gear, tractor gear, CSF idler gear, idler 
gear, and shift gear. How these gears work together 
depends on how the paper is fed through the printer. 
There are three possible modes of operation: tractor 
feed pull, tractor feed push, and friction feed. A 
push/pull switch under the left side of the tractor is 
used for detecting the push/pull mode when the lever 
is set for tractor feed. 

• Tractor feed pull - When you are using this mode, 
the paper feed gears work the following way: 
Looking at a left-side view of the gear assembly, 
the feed motor rotates in a clockwise motion and 
the platen gear turns counterclockwise. This motion 
turns the idler gear clockwise and makes the tractor 
gear turn counterclockwise. In this mode the paper 
holes are inserted on top of the sprocket. When the 
tractor gear turns, it moves the sprockets that pull 
the paper through the printing area. 

• Tractor feed push - In this mode the motor gear, 
platen gear, and idler gear move in the same way as 
explained above; however, an additional gear is 
used. The shift gear is used between the idler gear 
and the tractor gear. The shift gear reverses the 
rotation of the tractor gear, so that it is rotating in 
a clockwise direction. This reverse rotation, along 
with how the paper is fed, (paper is fed through the 
back) allows the paper to be pushed between the 
platen and the print area. 

• Friction feed — In this mode, a lever is shifted that 
moves the shift gear in such a way that the shift 
gear no longer meshes with the tractor gear, 
preventing the paper sprockets from moving. 
Consequently, the paper is fed down between the 
platen and the pinch rollers. The friction between 
these two surfaces causes the paper to move. 

The paper bail is moved up by the auto-load solenoid 
during auto-loading (push mode) or single-sheet 
feeding. After one inch of printing has occurred, the 
solenoid is deactivated and the paper bail is moved 
downward onto the paper. 



Paper-Empty There are two paper-empty sensors used in this printer. 

Detection One is a photo coupler that is used for rear paper feed, 

and the other is a microswitch used for bottom paper 
feed. Both are located on the left side under the paper 
pan. If both switches detect the absence of paper, a 
paper-empty signal is sent to the CPU. 



BIcxk 
Diagram 



Use Figure 14 (opposite) for reference when reading 
the preceding Theory of Operations section. 



Carrier 
Motor 



Paper 
Feed 
Motor 




CN8 




CN9 




CN10 




CN11 




CN12 


Auto Loading 


Paper 


Home 


CSF 


Paper 


Solenoid 




Empty 


Position 


Switch 


Handling 






Sensor 


Switch 




Change 



AppleTalk Interface 




CS EXTRAM 
OE (IC12) 
WR 


EXTRAM 
(IC9) 


qI WARKRAM 
WR 


WARKRAM 
(IC10) 



A II A 




DfTR ADn ^AD^ 
TXD (IC21)° ^ 
Interface IC DSR 
CS.RXRDY RXD 



P5 AG M5 P25 PG FG P30 

TtT T T T T 



Power Supply Circuit 



Reset 
Circuit 



CN14 



Interface 
Receiver IC 







DSR 






RXD 


(IC22) 




(IC23) 


DTR 






TXD 







A 



DSR 
RXD 



Interface Connector 



# Apple Technical Procedures 

ImageWriter LQ 

Section 2 - Take-Apart 



□ CONTENTS 

2.3 Front Cover 

2.5 Rear Cover 

2.6 Main Cover 

2.9 Control Panel PCA and Cable 

2.10 Option Card Cable 

2.11 Tractor Block 

2.13 Right Tractor Assembly 

2.14 Left Tractor Assembly 

2.15 Card Guide 

2.16 Print Head 

2.18 Print Head to Relay PCB Cable 

2.20 Platen Assembly 

2.22 Pinch Roller Assembly 

2.24 Paper-Out Sensor 

2.27 Tractor Drive Gear 

2.27 Cassette Latch 

2.28 Main Board 

2.31 Fuses 

2.32 Power Supply Assembly 

2.32 AC Pov/er Switch 

2.33 Transformer/Noise Filter PCA Assy Bracket 

2.36 Transformer 

2.37 Universal Transformer 

2.39 Noise Filter PCA 

2.40 Home Position Switch 
2.42 Cut Sheet Feeder Switch 
2.44 Carrier Drive Motor 
2.46 Auto-Load Solenoid 
2.48 Mechanical Assembly 

2.55 Paper-Detect Switch 

2.56 Color Ribbon Motor Assembly 

2.59 Paper Feed Motor 

2.60 Gear Linkage Assembly 
2.62 Option Card 



Note: If a step is underlined , detailed instructions for 
that step can be found elsewhere in the section. 



□ FRONT COVER 



Materials Required #2 Phillips screwdriver 

Remove l. open the front cover by grasping its sides and 

rotating it up and toward you. 




FIGURE 1 

2. Remove the four Phillips screws (Figure 1, #1) 
holding the front cover to the hinge plate 
(Figure 1, #2). 

3. Pull the front cover toward you approximately 1/4 
inch. 

CAUTION: The first time or two you remove tlie front 
coven you may need to pull a little harder than normal. Be 
careful: you can damage the top cover or hinge plate if 
you pull too hard. 



4. Rotate the cover toward its closed position. When 
it is closed about half way, you will be able to 
unhook the front cover from the main cover. 



Replace 



1. Place the hinge plate in the slot on the short side of 
the front cover (Figure 2). 




FIGURE 2 

2. Place the front cover on the main cover so that the 
hooks on the hinge plate (Figure 3, #1) mate with 
the corresponding hooks on the main cover 
(Figure 3, #2). 




FIGURE 3 

3. Slide the hinge plate and front cover together, and 
install the four hinge plate Phillips screws. 



CAUTION: Do not overtighten the screws, or you may 
strip the threads and permanently damage the front cover. 



□ REAR COVER 



Materials Required 



None 



Remove 



1. Open the front cover by grasping its sides and 
rotating it up and toward you. 

2. Open the rear cover by grasping its sides at the 
front, lifting up, and pivoting it back. 

3. Remove the cover by lifting it straight up. 



Replace 



1. Hold the cover straight up and lower the two 

brackets into their corresponding hinges in the main 
cover. 



2. Lower the rear cover to close it. 



3. 



Lower the front cover to close it. 



□ MAIN COVER 



Materials Required 



#2 Phillips screwdriver 



Remove 



1. Remove the rear cover. 




FIGURE 4 



2. Remove the platen knob (Figure 4, #1) by pulling it 
to the right, away from the printer. 

3. Loosen the four captive Phillips screws 
(Figure 4, #2) securing the main cover to the 
printer base. 

4. Place your fingers under the opened front cover 
with your thumbs wrapped around the main covci 
(Figure 4). Lift the main cover up to disengage the 
catches from the front of the printer. 

5. Pivot the front of the main cover up until you hear 
the catches at the rear of the cover "snap" loose 
from the base of the printer. Fiold the cover in this 
position. DO NOT pull the cover away from the 
printer yet. 




FIGURES 

• Control Panel PCA cable from connector CN13 
(Figure 5, #1) 

• Option Card PCA cable from connector CN15 
(Figure 5, #2) 

Replace l. Place the main cover so that it is standing up behind 

the printer. 

2. Tilt the main cover forward slightly, and connect the 
two cables from the main cover to the main board: 

• Control Panel PCA cable to connector CN13 

• Option Card PCA cable to connector CN15 



Hold the main cover by its sides and lower the 
cover onto the base of the printer, back first. 



Watch the following as you do: 




FIGURE? 



b) The plastic divider in the option card 

compartment should be in front of the power 
supply heat sink (Figure 7, #1). 



4. Partially screw in the four captive Phillips screws 
that secure the main cover to the bottom cover. 
Then tighten them. 

5. Install the platen knob on the right side of the 
printer. 

6. Replace the rear cover. 



□ CONTROL PANEL PGA AND CABLE 

Materials Required #2 Phillips screwdriver 

Remove l. Remove the main cover and place it upside down on 

a padded work surface. 




FIGURES 

2. Remove the control panel cable from its two 
retaining clips (Figure 8, #1) by gently lifting the 
top part of the clip with your forefinger and sliding 
the cable out with your other hand. 

3. Remove the four Phillips screws holding the control 
panel PCA to the main cover (Figure 8, #2) and lift 
out the control panel and cable. 



4. 



Unplug the cable from the control panel PCA. 



Replace l. Connect the non-toroid end of the control panel 

cable to the control panel PCA. 

Note: The cable connector is keyed and can only be 
installed one way. If it doesn't fit, don't force it. 
Turn the connector over and reconnect it. 



2. Place the control panel PCA into position and install 
the four Phillips screws that secure it to the main 
cover. 



Note: Be careful not to overtighten the screws or 
you may strip the threads and permanently damage 
the main cover. 



3. Place the control panel cable into its two retaining 
clips. 

4. Replace the main cover. 



□ OPTION CARD CABLE 

Materials Required #2 Phillips screwdriver 




2. Remove the Phillips screw securing the option card 
cover to the main cover (Figure 9, #1). 



FIGURE 10 



3. Remove the two Phillips screws securing the option 
card cable to the main cover (Figure 10, #1) and 
remove the cable. 



Replace l. Place the cable in position and install the two 

Phillips screws that secure it to the main cover. 

2. Place the option card cover in position and replace 
the Phillips screw to secure it to the main cover. 

3. Replace the main cover. 



□ TRACTOR BLOCK 

Materials Required 

Remove 



None 



1. Remove the main cover, 



2. Push the blue tractor levers back to release the 
tractor assembly. 



3. Remove the tractor levers by placing your thumb on 
the metal cylinder and your forefinger on the 
tractor lever and pushing the lever toward the 
center of the printer. This will require a bit of 
pressure, but don't worry, you won't break the 
lever. 

4. Remove the tractor by first pressing it toward the 
rear of the printer and then lifting up. 

Replace 




FIGURE 11 



1. Align the four posts on either side of the tractor 
assembly with the slots in the mechanical assembly 
(Figure 11), and lower the tractor into position. 

2. Snap the left and right tractor levers into place. 

3. Replace the main cover. 



) 



□ RIGHT TRACTOR ASSEMBLY 

Materials Required Grip-ring pliers or small, flatblade screwdriver 

#2 Phillips screwdriver 

Remove , l. Remove the tractor block and place it on a padded 

work surface. 




FIGURE 12 

2. Using the grip-ring pliers or the flatblade 
screwdriver, remove the E-ring securing the right 
tractor frame to the upper tractor shaft 

(Figure 12, #1). 

3. Remove the Phillips screw securing the right 
tractor frame to the paper pan (Figure 12, #2). 

4. Slide the right tractor frame off the two tractor 
shafts. 

5. Slide the tractor spacer off the upper tractor shaft. 



6. Flip the blue tractor release lever into the "up" 
position, and slide the tractor assembly off the 
tractor shafts. 



Replace 



1. slide the right tractor assembly onto the tractor 
shafts. Orient the tractor assembly so that the paper 
clamp opens to the right and faces forward. 

2. Slide the tractor spacer onto the upper tractor shaft. 

3. Slide the tractor frame onto the tractor shafts. 
Orient the frame so that the projection points down 
and the three smaller holes are closest to the paper 
pan. 

4. Position the tractor frame against the paper pan so 
that the positioning pins on the pan engage with the 
holes in the frame. Replace the Phillips screw to 
secure the tractor frame to the paper pan. 

5. Snap the E-ring into place to secure the upper 
tractor shaft to the tractor frame. 

6. Replace the tractor block. 



□ LEFT TRACTOR ASSEMBLY 



Materials Required 



None 



Remove 



1. Remove the right tractor assembly. 

2. Slide the paper guide off the tractor shafts. 

3. Flip the blue tractor release lever into the "up" 
position, and slide the left tractor assembly off the 
tractor shafts. 



Replace 



1. Slide the left tractor assembly onto the tractor 
shafts. Orient the tractor assembly so that the paper 
clamp opens to the left and faces forward. 

2. Slide the paper guide onto the tractor shafts. 
Orient the guide so that square tractor shaft is in 
the round opening and the round tractor shaft is in 
the square opening. 



3. 



Replace the right tractor assembly . 



□ CARD GUIDE 



Materials Required 



Jeweler's Phillips magnetic screwdriver 



Remove 



1. open the front cover and move the paper thickness 
lever to position 5. 

2. Remove the ribbon, if present. 




FIGURE 13 



3. Remove the two Phillips screws securing the card 
guide to its two mounting posts (Figure 13, #1). 

4. Lift the card guide up and out of the printer. 



Replace l. slide the card guide over its two mounting posts. 

2. Install, but don't tighten, the two Phillips screws 
that secure the card guide to the mounting posts. 

3. Perform the "Card Guide Adjustment," Section 3, 
Adjustments. 



□ PRINT HEAD 

Materials Required 



#2 Phillips screwdriver 
Small, flatblade screwdriver 



Remove l. Remove the main cover. 

2. Move the carrier assembly to the center of the 
printer. 




FIGURE 14 

3. Remove the flexible PCB holder (Figure 14, #1). 

4. Remove the two Phillips screws (Figure 14, #2) 
holding the print head to the carrier assembly. 

5. Lift up and hold the print head until it is 
approximately two inches above the carrier 
assembly. 



CAUTION: If you lift the print head too high you will strain 
and possibly damage the cables attached to it. 



FIGURE 15 



6. Place the small, flatblade screwdriver in tlie slot of 
the print head connector (Figure 15). Gently rotate 
the screwdriver in either direction until the sliding 
portion of the connector moves away from the rest 
of the connector. Slide the cable from the 
connector. 

7. Repeat step 6 for the other cable. 

1. Slide the flexible PCB cable as far as you can 
toward the rear of the printer through its slot in 
the carrier assembly. 

2. Slide the first cable into the rear connector on the 
print head. 

3. While holding the cable in place, press the sliding 
portion of the connector toward the body of the 
connector until it clicks into place. 

Hint: it's easier to slide the connector together if 
you place your thumb and forefinger on the ends of 
the connector. 



4. 



Repeat steps 2 and 3 for the other cable. 



5. Place the print head in position in the carrier 
assembly. 

6. Replace the flexible PCB holder. 

7. Start the two screws that hold the print head to the 
carrier assembly, but do not tighten them. 

8. Perform the "Print Head Gap Adjustment," in Section 
3, Adjustments. 

9. Replace the main cover. 



□ PRINT HEAD TO RELAY PCB CABLE 

Materials Required Small, flatblade screwdriver 

Remove l. Remove the print head. 

2. Slide the carrier assembly to the far left side of 
the printer. 




FIGURE 16 



3. Remove the two flexible PCB holders 

(Figure 16, #1) by pulling the holder up from the 
center. 




FIGURE 17 



4. Place the small, flatblade screwdriver in the slot of 
the flexible relay PCB connector (Figure 17, #1). 
Gently rotate the screwdriver in either direction 
until the sliding portion of the connector moves 
away from the rest of the connector. Slide the cable 
from the connector. 

5. Repeat step 4 for the other cable. 



Replace l. Take the print head cable with the narrower 

connector (this will be the cable on top exiting 
from the carrier assembly) and slide the cable into 
the flexible relay PCB connector on the left. 

2. While holding the cable in place, press the sliding 
portion of the connector toward the body of the 
connector until it clicks into place. 

3. Repeat steps 1 and 2 for the other cable, the one 
with the wider connector. 



4. 



Replace the print head. 



□ PLATEN ASSEMBLY 



Materials Required Flatblade screwdriver 

Grip-ring pliers or a small, flatblade screwdriver 
Needlenose pliers 

Remove l. Remove the main cover and card guide. 

2. Move the carrier assembly to the center of the 
printer. 

3. Open the paper bail by lifting it away from the 
platen. 




FIGURE 18 

4. Remove the left and right springs between the gap 
adjustment cams and the paper guide plate 
(Figure 18, #1). 

5. Using the grip-ring pliers or the small, flatblade 
screwdriver, remove the E-rings on ttie left and 
right gap adjustment cams (Figure 18, #2). 



6. Move the left and right gap adjustment cams 
(Figure 18, #3) inward, toward the platen. 



FIGURE 19 



7. Using the flatblade screwdriver, move the platen 
catches (Figure 19, #1) inward, toward the platen. 




FIGURE 20 



8. Remove the E-ring securing the cut sheet feeder 
idler gear (Figure 20, #1), and remove the idler 
gear. 

Hint: it is easier to remove the idler gear if you 
first align the teeth of the two gears so they mesh. 

9. Lift the platen from the mechanical assembly. 



Replace clean the paper-out sensor before you replace the 

platen assembly. Refer to Section 4, Preventive 
Maintenance for instructions. 

1. Place the platen assembly in the mechanical 
assembly. 

2. Replace the cut sheet feeder idler gear and snap the 
E-ring into place. 

3. Move the left and right platen catches outward until 
they engage fully with the platen holder. 

4. Snap the left and right gap adjustment cam E-rings 
into place. Make sure the metal washer is behind 
the E-ring. 

5. Attach the left and right springs between the gap 
adjustment cams and the paper guide plate. 

6. Replace the card guide and perform the "Card Guide 
Adjustment," Section 3, Adjustments. 

7. Replace the main cover. 



□ PINCH ROLLER ASSEMBLY 



Materials Required 



None 



Remove 



1. Remove the platen assembly . 




FIGURE 21 



Replace 



plate (Figure 21, 
assembly. 

• roller assembly in position. 
1. Place the pmch roller 





FIGURE 22 

nn each roller 
Mal^e sure the responding slots in the 

■ae olate to its original position. 

2. Return the paper gu.de plate 

3. ^^sl^c^^^.:^^^'-^^^ 



□ PAPER-OUT SENSOR 



Materials Required 



Small, diagonal cutters 
Needlenose pliers 



Remove 



1. Remove the mechanical assembly . 

2. Remove the platen assembly . 




FIGURE 23 

3. Remove the left and right springs between the 
paper pan and the paper-guide plate (Figure 23, #1). 

4. Remove the paper pan. 

5. Cut the cable ties that hold the paper-out sensor 
cable to the rest of the bundle of cables. 



) 




1 



FIGURE 24 

Use the needlenose pliers to remove the paper-out 
sensor arm (Figure 24, #1) from the release lever 
shaft (Figure 24, #2). 

Gently, turn the mechanical assembly over and place 
it on a padded work surface. Using the needlenose 
pliers, squeeze in the two tabs on the paper-out 
sensor holder. Then push the holder up. 



Gently, turn the mechanical assembly over and place 
it on the padded work surface. Remove the paper- 
out sensor holder by working it out from under the 
release lever shaft. 



Replace Note: Avoid touching the optical sensor while 

performing these steps. If you should touch the 
sensor, refer to the cleaning instructions in Section 
4, Preventive Maintenance prior to replacing the 
platen assembly. 




FIGURE 25 

1. Route the paper-out sensor cable through the cut out 
in the mechanical assembly (Figure 25, #1). 

2. Place the back end of the paper-out sensor holder 
under the release lever shaft. Then slide the holder 
back until it is positioned in the opening in the 
mechanical assembly. 

3. Press the holder down into the opening until you 
hear a click. 

4. Snap the paper-out sensor arm onto the release 
lever shaft. The arm should face toward the front of 
the printer. 

5. Attach the left and right springs between the paper 
pan and the paper guide plate. The paper-guide 
plate should be oriented so that the solid portion is 
toward the rear of the mechanical assembly. 

6. Place the paper guide plate in position. 

7. Replace the platen assemblv. 

8. Replace the mechanical assembly. 



□ TRACTOR DRIVE GEAR 



Materials Required 



Grip-ring pliers or small, flatblade screwdriver 



Remove 



1. Remove the tractor assembly. 



2. Using the grip-ring pliers or the screwdriver, 
remove the E-ring holding the tractor drive gear in 
place. 

3. Slide the drive gear from the shaft. 



Replace 



1. Slide the drive gear onto the shaft with the slotted 
portion of the gear on the inside. 



2. Snap the E-ring into place to secure the drive gear 
to the shaft. 

3. Replace the tractor assemblv. 



□ CASSETTE LATCH 



Materials Required 



Small, flatblade screwdriver 



Remove 



1. Remove the main cover. 



Use the screwdriver to pry the inside of the 
cassette latch inward, toward the center of the 
printer, and upward. 



Replace 



1. Place the cassette latch in position and press down 
until you hear a click. 



2. Replace the main cover, 



□ MAIN BOARD 

Materials Required #2 Phillips screwdriver 



Remove i. 

2. 
3. 



Remove the main cover. 

Orient the printer on your workbench so that the 
main board is near you. 

Disconnect the following cables from the main 
board: 

• Power supply cable from CNl (Figure 26, #1) 

• Auto load solenoid cable from CN8 
(Figure 26, #2) 

• Cut sheet feeder switch cable from CNll 
(Figure 26, #3) 

• Carrier motor cable from CN5 (Figure 26, #4) 

• Paper-out sensor cable from CN9 
(Figure 26, #5) 

• Paper handling change switch cable from CN12 
(Figure 26, #6) 

• Platen gap adjustment sensor cable from CN18 
(Figure 26, #7) 

• Home position switch cable from CNIO 
(Figure 26, #8) 

• Paper feed motor cable from CN6 
(Figure 26, #9) 

• Color ribbon assembly cable from CN7 
(Figure 26, #10) 

• Print head flexible relay PCBs from CN3 and 
CN4 (Figure 26, #11) 



FIGURE 26 



Remove the two Phillips screws (Figure 26, #12) 
securing the main board to the base of the printer. 

Lift the edge of the main board closest to you, and 
after it clears the case, pull it toward you to remove 
it from the printer. 



Replace l. Put the front edge of the main board into the four 

plastic clips in the base of the printer (Figure 27, 
#1). Lower the rear edge of the board into place. 




J 



FIGURE 27 



2. Install the Phillips screw (Figure 28, #12) that 
secures the right side of the main board to the base 
of the printer. Also, be sure to reattach the ground 
braid (Figure 28, #13). 

3. Install the Phillips screw (Figure 28, #14) at the 
left side of the main board. 




FIGURE 28 



4. Connect the following cables to the main board: 

• Power supply cable from CNl (Figure 28, #1) 

Note: Be careful to route the power supply 
cable away from the aluminum heatsink at the 
rear of the printer. 

• Auto load solenoid cable from CN8 
(Figure 28, #2) 

• Cut sheet feeder switch cable from CNll 
(Figure 28, #3) 

• Carrier motor cable from CN5 (Figure 28, #4) 

• Paper-out sensor cable from CN9 
(Figure 28, #5) 



• Paper-detect switch cable from CN12 
(Figure 28, #6) 

• Platen gap position sensor cable from CN18 
(Figure 28, #7) 

• Home position switch cable from CNIO 
(Figure 28, #8) 

• Paper feed motor cable from CN6 
(Figure 28, #9) 

• Color ribbon assembly cable from CN7 
(Figure 28, #10) 

• Print head flexible relay PCBs from CN3 and 
CN4 (Figure 28, #11) 

5. Replace the main cover. 



1 



□ FUSES 



Materials Required 



Fuse puller or a small, flatblade screwdriver 
Replacement fuse of the correct voltage and amperage 



Remove 



1. Remove the main cover. 



Use either the fuse puller or the flatblade 
screwdriver to remove the desired fuse. (Refer to 
"Illustrated Parts," Section IPL, for fuse placement 
information.) 



Replace 



1. Snap a fuse of the correct size into the fuse holder. 



Power Supply Fuse Rating: 



250 Volts/3 Amps 



Main Board Fuse Ratings: 

FUl 

FU2 

FU3 



125 Volts/8 Amps 
125 Volts/3 Amps 
125 Volts/1.5 Amps 



2. Replace the main cover. 



□ POWER SUPPLY ASSEMBLY 



Materials Required 



#2 Phillips screwdriver 
Long needlenose pliers 
Sharp knife 
Soldering iron 

Rosin-core solder (60% tin, 40% lead) 
Pen 

Masking tape 

1 inch of heat-shrink tubing 
Heat gun 



Components 



The group of components that make up the power 
supply assembly consists of the AC inlet receptacle, the 
AC power switch, the power transformer, the noise 
filter PCA, and the power supply itself, which is part of 
the main board. The following procedures deal with the 
removal and replacement of the first four items 
mentioned. If the power supply itself is identified as 
faulty, go to the main board take-apart section. 



AC Power 
Switch 



To remove or replace the AC power switch, perform the 
following procedure: 



Remove 



1. Remove the main cover. 



2. Remove the power switch (Figure 29, #1) from the 
case by pressing, with the needlenose pliers, the 
two plastic tabs at the sides of the switch and, at 
the same time, pushing the switch out of the case. 

3. Remove the four power switch wires through the 
slot (Figure 29, #2) in the case. 




FIGURE 29 



4. Using the knife, cut away the heat-shrink tubing 
from the four power switch posts. 

5. Mark the four wires connected to the power switch 
with the numbers 1 through 4, starting in the upper 
left corner and proceeding clockwise. 

6. Unsolder the four wires from the power switch. 



Replace 



1. Slide a 1/4-inch length of heat-shrink tubing on 
each of the power switch wires. 



2. Strip 1/8 inch of insulation from each of the power 
switch wires, and tin the wire. 

3. Solder the four wires to the power switch. The 
wire marked number 1 should be soldered to the 
post in the upper-left corner and each wire to the 
post clockwise to the previous one. 

4. Use the heat gun to shrink the heat-shrink tubing 
around each connection. 

5. Place the four power switch wires into the slot in 
the bottom cover of the printer. 

6. Place the power switch into its corresponding 
opening in the bottom cover of the printer and push 
until it clicks into place. 

Note: Make sure that the on the power switch is 
toward the rear of the printer. 

7. Replace the main cover . 



Transformer/ 
Noise Filter PCA 
Assembly Bracket 



The transformer and noise filter are attached to the 
transformer/noise filter PCA bracket. To remove or 
replace this bracket with the transformer and filter 
board on it, perform the following procedure: 



Remove 



1. Remove the main cover . 



2. Disconnect the transformer cable from main board 
connector CNl (Figure 30, #1). 




FIGURE 30 

3. Remove the power switch from the case by pressing, 
with the needlenose pliers, the two plastic tabs at 
the sides of the switch and, at the same time, 
pushing the switch out of the case. 

4. Remove the four power switch wires by pulling 
them through the slot in the case. 

5. Remove the four Phillips screws (Figure 31, #1) 
that secure the transformer/filter board assembly 
bracket to the base of the printer. 




FIGURE 31 

6. Carefully pivot the transformer/noise filter PCA 
assembly bracket toward the mechanical assembly. 
Once the noise filter PCA clears the AC power 
receptacle, slide the bracket toward the rear of the 
printer and carefully place the bracket assembly on 
the workbench beside or behind the printer. 



7. Remove the AC power receptacle from the base of 
the printer by pushing the two plastic retaining 
clips toward the front of the printer and sliding the 
receptacle up and out. 



Replace l. Rest the transformer/noise filter PCA assembly 

bracket behind the base of the printer near where it 
is to be installed, and slide the power receptacle 
into its two plastic retaining clips until it clicks 
into position. 

2. Move the assembly bracket into position in the 
printer and verify that: 

• No cables are caught underneath. 

• The metal bracket at the left side is above the 
assembly bracket (Figure 32, #1). 

• The assembly bracket is within its plastic 
retaining clip on the right side (Figure 32, #2). 




FIGURE 32 



Place the four power switch wires in the slot in the 
base of the printer. 

Place the power switch in its corresponding 
opening in the base of the printer, and push until 
the switch clicks into place. 

Note: Make sure that the on the power switch is 
toward the rear of the printer. 



5. Replace the four Phillips screws that secure the 
transformer/filter board assembly bracket to the 
base of the printer. 

6. Connect the transformer cable to main board 
connector CNl. 

7. Replace the main cover . 



Transformer 



To remove the transformer, perform the following 
procedure. 



Remove 



1. Remove the main cover. 



2. Disconnect the transformer cable from main board 
connector CNl (Figure 33- A, #1). 




FIGURE 33-A 

3. Using the needlenose pliers, squeeze each of the 
four plastic standoffs to release the noise filter 
PCA. 

4. Mark the two transformer wires connected to the 
noise filter PCA as shown in Figure 33-B. 




FIGURE 33-B 



5. Desolder these two wires from the noise filter PCA. 

6. Remove the three Phillips screws securing the 
transformer to the transformer/noise filter PCA 
assembly bracket (Figure 33-C, #1) and remove the 
transformer. 




Replace l. Place the transformer in position on the 

transformer/filter board assembly bracket and 
replace the three Phillips screws that secure it to 
the bracket. 



2. Solder the two wires to the noise filter PCA. Match 
the numbers marked on the wires with those in 
Figure 33-B for correct placement. 

3. Place the noise filter PCA in position against the 
standoffs and press each corner until you hear a 
click. 



4. Plug the connector from the transformer into CNl 
on the main board. 

5. Replace the main cover . 



Universal To remove or replace a universal transformer, you must 

Transformer remove the transformer/noise filter PCA assembly 

bracket first, since you have to remove the voltage 

selector switch. 

J 



Remove 



1. Remove the transformer/noise filter PCA assembly 
bracket . 



2. Mark the two transformer wires connected to the 
noise filter PCA as shown in Figure 34-A. 




FIGURE 34-A 



3. Remove the two flat-head 8 x 32 self-tapping screws 
(Figure 34-B,#l) from the bottom of the bracket 
assembly. These screws hold the voltage selector 
switch (Figure 34-B,#2) in place. 








o 



FIGURE 34-B 



4. Remove the three Phillips screws (Figure 34-C) that 
secure the transformer to the transformer/noise 
filter PCA assembly bracket, and remove the 
transformer. 




FIGURE 34-C 



Replace 



1. Place the transformer in position on the 

transformer/filter board assembly bracket, and 
replace the three Phillips screws. 



2. Place the voltage selector switch over the hole in 
the bracket, and secure it using the two flat-head 
screws. The screws go from the bottom of the 
bracket into the switch. 

3. Solder the two wires to the noise filter PCA. Match 
the numbers marked on the wires with those in 
Figure 34-A for correct placement. 

4. Place the noise filter PCA in position against the 
standoffs and press each corner until you hear a 
click. 

5. Replace the transformer/filter board assembly 
bracket . 

6. Replace the main cover . 



Noise Filter 
PCA 



To remove the noise filter PCA, perform the following 
procedure: 



Remove 



1. Remove the main cover. 



Using the needlenose pliers, squeeze each of the 
four plastic standoffs to release the noise filter 
PCA. 



3. Mark the wires connected to the noise filter PCA as 
shown in Figure 35. 




FIGURE 35 



4. Desolder each of the wires. 



Replace 



1. Solder each of the wires to the noise filter PCA. 
Match the numbers marked on the wires with those 
in Figure 35 for correct placement. 



2. Place the noise filter PCA in position against the 
standoffs, and press each corner until you hear a 
click. 

3. Replace the main cover . 



□ HOME POSITION SWITCH 



Materials Required 



#2 Phillips screwdriver 
Small diagonal cutters 



Remove 



1. Remove the main cover . 




FIGURE 36 




FIGURE 37 

3. Remove the Phillips screw (Figure 37, #1) securing 
the home position switch to the mechanical 
assembly, and remove the switch. 

4. Cut the cable ties that hold the home position 
switch cable to the rest of the cables routed to the 
main board. 



Replace l. Place the home position switch in position, and 

partially screw in the Phillips screw that secures 
the switch to the mechanical assembly. Be sure the 
nipple on the bracket is seated in its mating hole in 
the mechanical assembly. 

2. Route the home position switch cable to the rear of 
the printer, and connect it to main board connector 
CNIO. 

3. Perform the "Home Position Switch Adjustment," 
Section 3, Adjustments. 

4. Replace the main cover . 



□ CUT SHEET FEEDER SWITCH 

Materials Required #l Phillips screwdriver 

Remove l. Remove the main cover, 




FIGURE 38 

2. Remove the Phillips screw that secures the cut 

sheet feeder switch to the paper bail/platen bracket 
(Figure 38, #1). 



3. Remove the switch and the cable from the cable 
clips on the paper bail/platen bracket. 




FIGURE 39 



4. Disconnect the cable from main board connector 
CNll (Figure 39, #1). 

5. Remove the cable from the cable clip on the back of 
the mechanical assembly. 

6. Remove the switch. 




FIGURE 40 



2. Route the cable through the cable clips on the paper 
bail/platen bracket (Figure 40, #1). 

3. Route the cable through the cable clip on the back 
of the mechanical assembly. 

4. Connect the cable to main board connector CNll. 



5. Replace the main cover. 



□ CARRIER DRIVE MOTOR 

Materials Required #2 Phillips magnetic screwdriver 

Remove 1. Remove the main cover. 




2. Loosen the Phillips screw that binds the ribbon gear 
unit in place (Figure 41, #1). 

3. Remove the timing belt from the pulley on the 
ribbon gear unit. 

4. Cut the cable ties that hold the carrier motor cable 
to the rest of the cables in the bundle. 



) 




FIGURE 42 




6. Remove the three PhilUps screws that secure the 
carrier motor to the support plate assembly 
(Figure 43, #1). 

7. Lift the carrier motor out of the printer. 



Replace l. Place the carrier belt around the pulley on the 

ribbon gear unit. 

2. Place the carrier motor and the support plate on the 
support plate assembly. 

3. Check under the carrier motor and make sure the 
carrier belt is around the gear of the carrier motor. 
If it isn't, work it onto the gear with your 
forefinger. 

4. Install the three Phillips screws that secure the 
carrier motor to the support plate assembly and 
tighten them. 

5. Verify that the carrier assembly moves freely in 
both directions. 

6. Attach the carrier motor cable to main board 
connector CN5. 

7. Tighten the Phillips screw that holds the ribbon 
gear unit in place. 



□ AUTO-LOAD SOLENOID 

Materials Required #2 Phillips screwdriver 

Small, diagonal cutters 



Remove 1. Remove the mechanical assembly. 



2. Cut the cable ties that hold the auto-load solenoid 
cable to the rest of the cables in the bundle. 



FIGURE 44 



3. Disconnect the auto-load solenoid cable from main 
board connector CN8 (Figure 44, #1). 




© 



FIGURE 45 



4. Remove the Phillips screw that secures the auto- 
load solenoid to the right-side frame (Figure 45, #1) 
and remove the solenoid. 



Hint: The opening in the arm of the auto-load 
solenoid is slotted so you'll have to rotate the arm 
slightly to unhook it from the paper bail bracket. 



Replace 1. Place the auto-load solenoid in place against the 

right side frame and hook the arm to the paper bail 
bracket. 

Note: Be sure the spring is replaced between the 
arm and the solenoid. 

2. Replace the Phillips screw to secure the solenoid to 
the right-side frame. 

3. Connect the auto-load solenoid cable to main board 
connector CN8. 

4. Replace the mechanical assembly. 



□ MECHANICAL ASSEMBLY 

Materials Required Phillips screwdriver 

Small, diagonal cutters 



Remove l. Remove the main cover. 



2. Slide the carrier assembly to the far left side of 
the printer. 



FIGURE 46 

Remove the two flexible PCB holders 

(Figure 46, #1) by pulling the holder up from the 

center. 




FIGURE 47 



Place the flatblade screwdriver in the slot of the 
flexible relay PCB connector (Figure 47, #1). 
Gently rotate the screwdriver in either direction 
until the sliding portion moves away from the rest 
of the connector. Slide the cable from the 
connector. 



5. Repeat step 4 for the other connector. 




FIGURE 48 

) 

6. Loosen, but do not remove, the three screws that 
secures the mechanical assembly to the bottom cover 
(Figure 48, #1). 

7. Remove the Phillips screw (Figure 48, #2) that 
secures the ground braid to the rear of the 
mechanical assembly. 

8. Remove the Phillips screw (Figure 48, #3) that 
attaches the power supply bracket to the rear of the 
mechanical assembly. 

9. Remove the two Phillips screws that secure the 
fixer bar to the mechanical assembly, if present 
(Figure 48, #4). 

10. Open the cable clamp (Figure 48, #5) at the right 
rear side of the printer, and remove the cables from 
the clamp. 



FIGURE 49 



Disconnect the following cables from the main 
board: 

• Auto-load solenoid cable from CN8 
(Figure 49, #1) 

• Cut sheet feeder switch cable from CNll 
(Figure 49, #2) 

• Carrier motor cable from CN5 (Figure 49, #3) 

• Paper-out sensor cable from CN9 
(Figure 49, #4) 

• Paper-detect switch cable from CN12 
(Figure 49, #5) 

• Platen gap position sensor cable from CN18 
(Figure 49, #6) 

• Home position switch cable from CNIO 
(Figure 49, #7) 

• Paper feed motor cable from CN6 
(Figure 49, #8) 

• Color ribbon assembly cable from CN7 
(Figure 49, #9) 



FIGURE 50 



12. Use the flat-blade screwdriver to release the two 
plastic tabs holding the mechanical assembly to the 
bottom cover (Figure 50, #1). As you release the 
first tab, use your other hand to hold that side of 
the mechanical assembly above the tab, and then 
release the other tab. 

13. Carefiilly lift the mechanical assembly from the 
bottom cover. Don't be afraid to use a little bit of 
force to pull the assembly loose. 



Replace l. Place the mechanical assembly in position in the 

bottom cover. 

Be sure to engage the rubber feet at the rear of the 
mechanical assembly with the tabs in the bottom 
cover (Figure 51, #1). 

Be sure you don't pinch any wires under the 
mechanical assembly. 



FIGURE 51 



Press down the mechanical assembly until you hear 
a click. 

Check the alignment posts (Figure 50, #2) to make 
sure the assembly is correctly positioned. 

3. Tighten the three screws securing the mechanical 
assembly to the bottom cover (Figure 50, #3). 

4. Place the fixer bar (Figure 50, #4) in position, and 
replace the two Phillips screws (Figure 50, #5). 

5. Attach the ground braid (Figure 50, #6) to the 
mechanical assembly with the Phillips screw. 

6. Replace the power supply bracket screw 
(Figure 50, #7). 

7. Route the auto-load solenoid and platen gap position 
sensor cables (Figure 50, #8) through the cable 
clamp (Figure 50, #9), and close the clamp. 




Connect the following cables to the main board: 

• Auto load solenoid cable from CN8 
(Figure 52, #1) 

• Cut sheet feeder switch cable from CNll 
(Figure 52, #2) 

• Carrier motor cable from CN5 
(Figure 52, #3) 

• Paper-out sensor cable from CN9 
(Figure 52, #4) 

• Paper-detect switch cable from CN12 
(Figure 52, #5) 

• Platen gap position sensor cable from CN18 
(Figure 52, #6) 

• Home position switch cable from CNIO 
(Figure 52, #7) 

• Paper feed motor cable from CN6 
(Figure 52, #8) 

• Color ribbon assembly cable from CN7 
(Figure 52, #9) 




FIGURE 52 



9. Take the print head cable with the narrower 

connector (this will be the cable on top that exits 
from the carrier assembly), and slide the cable into 
the flexible relay PCB connector on the left. 

10. While holding the cable in place, press the sliding 
portion of the connector toward the body of the 
connector until it clicks into place. 

11. Repeat steps 9 and 10 for the other cable, the one 
with the wider connector. 

12. Replace the two flexible PCB holders. 

13. Replace the main cover . 



□ PAPER-DETECT SWITCH 



Materials Required Phillips screwdriver 

Small, diagonal cutters 



Remove l. Remove the mechanical assembly. 



Cut the cable ties that hold the paper-detect switch 
cable to the cables in the rest of the bundle. 



3. Remove the Phillips screw that secures the paper- 
detect switch to the paper-guide plate. 



Replace l. Place the paper-detect switch in position on the 

paper-guide plate. Make sure the tab on the guide 
plate is aligned with the corresponding circular 
opening in the switch. 



2. Replace the Phillips screw that secures the switch 
to the paper guide plate. As you tighten the screw, 
make sure the switch is correctly positioned. 



3. Replace the mechanical assembly. 



□ COLOR RIBBON MOTOR ASSEMBLY 



Materials Required 



#2 Phillips screwdriver 
Jeweler's Phillips screwdriver 
Small, diagonal cutters 
Needlenose pliers 



Remove 



1. Remove the mechanical module. 



2. Cut the cable ties that hold the color ribbon motor 
and ribbon home position switch cables to the rest 
of the cables in the bundle. 

3. Using the needlenose pliers, rotate the rubber 
grommet holding the ribbon home position switch 
cable to the mechanical module. Rotate the grommet 
until the slot is even with the slot in the metal 
bracket. 

4. Pull the home position switch cable from the 
grommet and bracket. 




FIGURE 53 



5. Remove the three Phillips screws that secure the 
color ribbon motor assembly to the mechanical 
module (Figure 53, #1). 



6. Remove the color ribbon motor assembly. 

Replace l. Rotate the left shift gear so that the opening is 

pointing toward the bottom of tihe bradket. 

2. Rotate the carriage shaft toward you until it stops. 




Place the ribbon motor assembly against the frame. 
The left shift gear should engage with the carriage 
shaft. Also, the projection at the base of the ribbon 
motor holder should be inserted into the frame 
(Figure 54). 



FIGURE 55 



4. Put the tab shown in Figure 55 into the groove of 
the left gear cam. 

5. Install the two Phillips screws that attach the motor 
assembly to the mechanical module. 

6. Attach the ribbon switch to the frame using the 
2x6 mm screw. 

7. Place the ribbon switch wire in the rubber grommet 
and rotate the grommet with the needlenose pliers 
90 degrees in either direction. 




FIGURE 56 



8. Connect the ribbon motor and switch cable to 
connector CN7 on the main board (Figure 56, #1). 

9. Replace the mechanical module . 



□ PAPER FEED MOTOR 



Materials Required #2 Phillips screwdriver 

Small, diagonal cutters 



Remove l. Remove the mechanical module . 

2. Cut the cable ties that hold the paper feed motor 
cable to the rest of the cables in the bundle. 



J ^ f i 

~ lij j III ^— ' 










1 








^ — 









FIGURES? 



3. Disconnect the paper feed motor cable from main 
board connector CN6 (Figure 57, #1). 




FIGURE 58 

4. Remove the four Phillips screws that secure the 
paper feed motor to the paper feed motor bracket 
(Figure 58, #1). Remove the paper feed motor. 



Replace l. Place the paper feed motor in position against the 

paper feed motor bracket. Orient the motor so that 
the wires exit towards the rear of the printer. 

Note: Hold the paper feed motor in position and 
rotate the platen back and forth, and make sure no 
binding occurs between the paper feed motor gear 
and the other gears in the gear train. 

2. Replace the four Phillips screws that hold the paper 
feed motor to its bracket. (The longer screws are 
used on the bottom of the motor.) 

3. Connect the paper feed motor cable to main board 
connector CN6. 

4. Replace the mechanical module. 



□ GEAR LINKAGE ASSEMBLY 



Materials Required #2 Phillips screwdriver 

Grip-ring pliers or small, flatblade screwdriver 



Remove l. Remove the mechanical assembly. 




FIGURE 59 



2. Remove the four Phillips screws securing the paper 
feed motor and bracket to the mechanical assembly 
(Figure 59, #1). Set the motor on the work surface 
next to the mechanical assembly. 

3. Using the grip-ring pliers or the small screwdriver, 
remove the E-ring (Figure 59, #2) securing the 
idler gear (Figure 59, #3) and the upper portion of 
the gear linkage assembly to the upper post on the 
mechanical assembly. Remove the idler gear^ 

4. Remove the Phillips screw securing the lower 
portion of the gear linkage assembly to the release 
lever shaft (Figure 59, #4). 

5. Use the flatblade screwdriver to gently pry the 
lower portion of the gear linkage assembly from the 
release lever shaft. The fit is quite tight, so don't 
be afraid to use a little extra force to separate the 
two. 



6. Remove the gear linkage assembly. 



Replace l. Align the opening in the lower portion of the gear 

linkage assembly with the release lever shaft. 

2. Place the opening on the upper portion of the gear 
linkage assembly on the post on the mechanical 
assembly. 

3. Replace the idler gear on the upper post. 

4. Snap the E-ring into place to hold the idler gear and 
the gear linkage assembly to the upper post. 

5. Replace the Phillips screw at the lower portion of 
the gear linkage assembly. 

6. Put the paper feed motor and bracket into position, 
and replace the three Phillips screws. (The two 
longer screws are used on the bottom of the motor.) 

7. Replace the mechanical assembly. 



□ OPTION CARD 



Materials Required 



#2 Phillips screwdriver 



Remove 



1. open the front and rear covers. 




FIGURE 60 

2. Remove the Phillips screw that secures the option 
card cover to the main cover (Figure 60, #1). 
Remove the option card cover. 

3. Carefully, lift the option card straight up from its 
mating connector. DO NOT try to remove the card 
fully from the printer yet. 




FIGURE 61 



4. Disconnect the ground wire for the metal lug on the 
main board (Figure 6l, #1). 

5. Remove the card from the printer. 



Replace l. Locate the metal lug on the main board and attach 

the ground wire. 

2. Hold the card on the right side, with the component 
side down, and lower the card onto the plastic 
support post. 

3. Press the left side of the card down firmly to fasten 
the card's connector to the printer's connector. 

4. Replace the option card cover and its Phillips screw. 



fk Apple Technical Procedures 

ImageWriter LQ 

Section 3 - Adjustments 



□ CONTENTS 



3.3 Print Head Gap 

3.6 Platen Gap and Parallelism 

3.10 Card Guide 

3.12 Color Ribbon Home Position 

3.14 Color Ribbon Parallelism 

3.16 Horizontal Registration 

3.18 Home Position Switch 



Note: If a step is underlined , detailed instructions for 
that step can be found in Section 2, Take-Apart. 



□ PRINT HEAD GAP 



Materials Required Macintosh Peripheral Tests disk 

#2 Phillips screwdriver 
Metric thickness gauge 



Procedure l. Using the Macintosh Peripheral Tests disk, perform 

"Print Test— Wide." (Refer to Section 5, Diagnostics.) 

2. Be sure the power is off. 

3. Remove the ribbon cartridge. (Refer to Section 1, 
Basics.) 

4. Remove the card guide . 




PRINT HEAD 



FIGURE1 



5. Check to see that the paper thickness lever 
(Figure 1, #1) is pushed all the way toward the 
back of the printer, to the number-one position. 

6. Move the carrier assembly to the center of the 
printer (Figure 1, #2). 




CARRIER 

FIGURE 2 



7. Loosen the two screws that secure the print head 

(Figure 2, #1). ) 

Note: Be careful not to lean on the front cover. 

8. Adjust the gap by moving the print head forward or 
backward so that a thickness gauge of 0.35 mm 
(Figure 2, #2) can be inserted between the print 
head and platen, and a 0.4 mm gauge cannot. 

The print head is properly adjusted when a 0.35 mm 
gauge can be inserted without any resistance and a 
0.4 mm gauge drags slightly. 

Note: Ensure that the print head is parallel to the 
platen and that the carrier assembly is not lifted up 
during measurement. 

If you are unable to obtain a proper adjustment, 

complete step 9, skip steps 10 through 13, and 
proceed to the "Platen Gap and Parallelism" 
adjustment. 



J 



9. Tighten both screws securing the print head. 

10. Check the gap at the extreme right and extreme left 
of the platen. 

11. Rotate the platen a half-revolution and recheck the 
gap at the center, extreme right, and extreme left. 

If the gap does not stay in adjustment across the 
platen, skip steps 12 and" 13 and proceed to the 
"Platen Gap and Parallelism" adjustment. 

12. Re place the card guide . 

Note: when installing the card guide, be sure to 
perform the "Card Guide" adjustment. 

13. Replace the ribbon cartridge. 



'1 



□ PLATEN GAP AND PARALLELISM 



Materials Required 



#2 Phillips screwdriver 
8 mm, Open-end wrench 
Metric thickness gauge 



Procedure 



1. Perform the "Print Head Gap" adjustment. 



2. Be sure the power is off. 

3. Remove the ribbon cartridge. (Refer to Section 1, 
Basics.) 

4. Remove the card guide . 

5. Push the paper thickness lever (Figure 3, #1) 
toward the back of the printer, to the number-one 
position. 

6. Loosen the eccentric roller set screws on both the 
left (Figure 3, #2) and right sides of the printer. 

Note: Be careful not to lean on the front cover. 

7. Adjust the gap, with the carrier assembly at the 
extreme left of the platen, by turning the hexagon- 
shaped nut on the left eccentric roller (Figure 3, #3) 
and then on the right eccentric roller. 

a) You should be able to insert a 0.35 mm thickness 
gauge (Figure 3, #4), but not a 0.4 mm gauge, 
between the print head and the platen. 

b) The print head is properly adjusted when a 0.35 
mm gauge can be inserted without any resistance 
and a 0.4 mm gauge drags slightly. 



Note: Be careful not to lift up on the carrier 
assembly during measurement. 




FIGURE 3 




FIGURE 4 



8. Move the carrier to the extreme right and adjust 
the gap as in step 7. 

9. Move the carrier to the center and repeat step 7. 

10. Tighten the eccentric roller set screws (Figure 4, #1) 
on both the left and right sides of the printer while 
holding the hexagon nut (Figure 4, #2) with the 
wrench. 

11. Check the gap at the extreme left, extreme right, 
and center of the printer. If all three checkpoints 
are not in adjustment, repeat steps 6 through 10 
until they are. 

12. Rotate the platen a half-revolution and check the 
gap at the left, right, and center of the printer. If 
all three checkpoints are not in adjustment, repeat 
steps 6 through 11 until they are. 

13. Replace th^ g^rd guide. 

Note: when installing the card guide, be sure to 
perform the "Card Guide" adjustment. 

14. Replace the ribbon cartridge. 



□ CARD GUIDE 

Materials Required #1 Phillips screwdriver 

1 sheet of 24-lb. paper 

Procedure l. Push the paper thickness lever (Figure 5, #1) 

toward the back of the printer, to the number-one 
position. 




FIGURES 

2. Be sure the power is off. 

3. Move the carrier assembly to the center of the 
printer (Figure 5, #2). 

4. Loosen the two card guide set screws (Figure 5, #3). 



CARDHOLDER 



FIGURE 6 

Roll the sheet of paper between the card guide and 
the platen (see Figure 6, #1). 

Gently push forward on the card guide until it stops 
against the paper (see Figure 6, #2). 

Tighten the two card guide set screws (Figure 6, #3) 
while holding the card guide in position. 



□ COLOR RIBBON HOME POSITION 



Materials Required Macintosh Peripheral Tests disk 

#2 Phillips screwdriver 
DIP switch setter 



Procedure l. Using the Macintosh Peripheral Tests disk, perform 

"Print Test— Wide." (Refer to Section 5, 
Diagnostics.) 

2. Be sure the power is off. 




FIGURE 7 



3. Compare your printout with the color sequence of 
the ribbon to determine whether the printer is 
printing above or below the center of the color 
bands (Figure 7, #1). 



4. Adjust the print position to the center of the color 
bands by changing the DIP switch settings one at a 
time. 



When the print position is above the center of the 
color bands, refer to Table 1. When the print 
position is below the center of the color bands, 
refer to Table 2. 



Print position is above center of color bands 


DIP 

3-3 


DIP 

3-4 


DIP 

3-5 


Amount of down- 
ward movement (mm) 


On 


On 


Off 


0.78125 


Off 


On 


Off 


0.46875 


On 


Off 


Off 


0.1 5625 



TABLE 1 



Print position is below center of color bands 



DIP 

3-3 


DIP 
3-4 


DIP 

3-5 


Amount of upward 
movement (mm) 


On 


Off 


On 


0.1 5625 


Off 


On 


On 


0.46875 


On 


On 


On 


0.78125 



TABLE 2 



5. Repeat steps 1 through 4 until the print position is 
in the center of the color bands. 



□ COLOR RIBBON PARALLELISM 



Materials Required Macintosh Peripheral Tests disk 

#2 Phillips screwdriver 



Procedure Note: The "Color Ribbon Home Position" adjustment 

must be made before completing this adjustment. 

1. Be sure the power is off. 




FIGURE 8 

2. Compare your printout with the color sequence of 
the ribbon to determine whether the printer is 
printing above or below the center of the color 
bands (Figure 8, #1). 

3. Remove the ribbon cartridge. (Refer to Section 1, 
Basics.) 



RIBBON SHAFT 

FIGURE 9 



4. Loosen the set screw (Figure 9, #1) on the ribbon 
shaft holder. 

5. Adjust the print position by slightly moving the 
ribbon shaft holder up or down (Figure 9, #2). 

When the print position is above the center of the 
color bands, move the holder upward. When the 
print position is below the center of the color 
bands, move the holder downward. 

6. Tighten the set screw on the ribbon shaft holder. 

7. Replace the ribbon cartridge. 



8. Using the Macintosh Peripheral Tests disk, perform 
"Print Test— Wide." (Refer to Section 5, 
Diagnostics.) 

9. Repeat steps 2 through 8 until the print position is 
centered. 



□ HORIZONTAL REGISTRATION 



Materials Required Macintosh Peripheral Tests disk 

DIP switch setter 



Procedure l. Using the Macintosh Peripheral Tests disk, perform 

the "Horizontal Registration" test. (Refer to 
Section 5, Diagnostics.) 

2. Be sure the power is off. 

3. Check the printout and determine which set of lines 
provides the best horizontal registration. The best 
horizontal position produces the straightest set of 
lines. 



Using Tables 3 and 4, and Figure 10, set DIP 
switches 3-6, 3-7, and 3-8 according to the best 
registration selected on the printout. (1 = On; 
= Off.) 



DIP Sw 
3-6 


DIP Sw 
3-7 


DIP Sw 

3-8 


Amount of left 
movement (mm) 


On 


On 


Off 


+0.1 5 9 


Off 


On 


Off 


+0.1 6 


On 


Off 


Off 


+ 0.0 5 3 


Off 


Off 


Off 


+ 0.0 



TABLE 3 

LEFT MOVEMENT 



DIP <>w 

U it www 

3-6 


DIP 

IJti O WW 

3-7 


DIP 

U i 1 O WW 

3-8 


Amount of right 
movement (mm) 


Off 


Off 


On 


- 0.0 4 4 


On 


Off 


On 


-0.088 


Off 


On 


On 


-0.1 3 2 


On 


On 


On 





TABLE 4 

RIGHT MOVEMENT 



110* 




1 



10 



) 1 



i 1 



Ci 1 i 



1 1 1 




FIGURE 10 



□ HOME POSITION SWITCH 



Materials Required Macintosh Peripheral Tests disk 

#2 Phillips screwdriver 



Procedure l. using the Macintosh Peripheral Tests disk, perform 

the "Horizontal Registration" test. (Refer to Section 
5, Diagnostics.) 

2. Be sure the power is off. 

3. Move the print head to the right side of the platen. 




4. Loosen the screw (Figure 11, #1) securing the home 
position switch (Figure 11, #2). 



Reload your printout into the printer. 

Note: Be sure the left edge of the sheet of paper 
aligns with the red line on the paper bail. 

Check the alignment of the first vertical line (print 
home position) of the printout (Figure 11, #3) with 
the black line on the paper bail. 

When the print is to the right of the black line, 

move the home position switch left. When the print 
is to the left of the black line, move the home 
position switch right. 

Tighten the screw (Figure 11, #1) securing the 
home position switch (Figure 11, #2). 

Repeat steps 1 through 7 until the print home 
position is aligned. 



# Apple Technical Procedures 

ImageWriter LQ 

Section 4 - Troubleshooting 



□ CONTENTS 



4.3 Introduction 

4.3 Before You Start 

4.3 How to Use the Symptom/Cure Chart 

4.4 PreHminary Checks 
4.4 Printer 

4.7 Cut Sheet Feeder 

4.9 Symptom/Cure Chart 

4.9 Power Problems 

4.9 Communication Problems 

4.9 Paper Feed Problems 

4.10 Carrier Problems 

4.11 Printing Problems 

4.12 Color Printing Problems 
4.12 Other Problems 



4.13 Testing the Primary and Secondary Fuses 

4.13 Testing the Power Switch 

4.14 Testing the Home Position Switch 

4.15 Testing the Carrier Drive Motor 

4.16 Testing the Paper-Handling Change Switch 

4.17 Testing the Paper Feed Motor 

4.18 Testing the Auto-Load Solenoid 
4.18 Testing the Paper-Out Sensor 
4.20 Testing the Cover-Open Sensor 

4.20 Testing the Color Ribbon Detect Switch 

4.22 Testing the Color Ribbon Home Position Switch 

4.23 Testing the Color Ribbon Motor 

4.24 Testing the Control Panel Switches 



Note: If a step is underlined, detailed instructions for 
that step can be found in Section 2, Take-Apart. 



□ INTRODUCTION 

Before Read the section titled ^'Preliminary Checks" before 

You Start you begin troubleshooting. Items listed here do not 

require any disassembly, tools, or special setups and 
can save you time and your customer money when 
troubleshooting the ImageWriter LQ. 

If the suggestions in "Preliminary Checks" do not 
correct the problem, proceed to the appropriate 
symptom/cure chart. 



How to Use First locate the symptom that comes closest to 

the Symptom/ describing the problem; then perform the first 

Cure Chart corrective action on the solution list. If that corrective 

action does not fix the problem, proceed to the next 
action. If you replace a module and find that the 
problem remains, reinstall the original module before 
proceeding. 

If a step asks you to test something, the procedure can 
be located elsewhere in this section. 



If a tested component is defective, replace it. If it is 
not defective, proceed to the next action listed. 



□ PRELIMINARY CHECKS 



Printer 



The following chart lists common problems that have 
simple solutions. Checking for these problems when 
you begin troubleshooting can save you time and effort. 



Power light off, 

no carrier movement 



1. Try another electrical outlet. 

2. International units only: Verify the setting of the 
voltage selector switch. 

3. Replace the power cord. 



Error ligtit blinl<s 



- Close the front cover. 



Error ligfit on, 
Select light off 



- No paper or improperly inserted paper. 



No printing 



1. Make sure the printer is selected. 

2. Verify that the interface connections to the 
printer are secure. 

3. Verify the DIP switch settings using the list in 
Section 1, Basics. 



Garbled printing 



1. Verify the DIP switch settings using the list in 
Section 1, Basics. 

2. Verify that the interface connections to the printer 
are secure. 



Software-specific 
problem 



- Try using a known-good piece of software. 



• No communication 
with option card 
instaHed 



Verify that DIP switch 2 position 4 is set to ON. 



• Paper feed difficulties: l. Verify the setting of the paper thickness lever. 
binding, tearing, etc. 2. check and, if necessary, clear the paper path. 



Torn paper 



1. Verify the setting of the paper thickness lever. 

2. Verify that the paper-feed lever is set to the type of 
paper being used. 

3. Verify that the paper is correctly installed and, if 
using tractor feed paper, that the sprocket holes are 
properly engaged on the tractor sprockets. 



Printing too light 



1. Verify the setting of the paper thickness lever. 

2. Replace the ribbon. 



Printing too darl< - Verify the setting of the paper thickness lever. 



Carrier strif<es ttie 
right-side frame 
when printing on 
4-part carbonless 
forms or printing on 
the perforated edge 
of tractor-feed paper 



2. 
3. 



If 4-part carbonless forms are being used, make sure 

they are within specifications. (Maximum thickness 

is 0.55 millimeters.) 

Be sure the paper is properly aligned. 

Verify the paper thickness lever is in the correct 

position. 



Uneven print pattern 

on self-test (four 
lines light-three 
lines dark) 



The printer is sensing a color ribbon carriage. 

Make sure the black ribbon carriage is pressed 
down completely on the left side to activate the 
ribbon microswitch. 



Printing less 
then best quality 



To get the best quality output when printing from a 
Macintosh, the system file must have the correct 
fonts. Be sure the system has fonts in the same size 
as the desired output ("IX" font) as well as its 3- 
times equivalent ("3X" font). For example, if your 
document is in Times 12 point, you must have both 
Times 12 and Times 36 installed in your system file 
for highest quality output. If the 3X font is absent, 
the output will be scaled from an available font, and 
there will be some loss in print quality. 



Printing has 
squasfied lines; 
misregistration 
problems when 
using pin feed paper 



2. 



For the best print quality, instruct the customer to 
use the pull tractor and the bottom feed slot. The 
paper should be stacked at least 12 inches below 
the printer. The straightness of this paper path 
combined with the pull tractor helps to keep the 
paper securely around the platen. This paper path is 
strongly recommended for printing labels or 
multipart forms. 

If the unit does not have a slotted table, instruct the 
user to be sure that the power cord or printer cable 
does not obstruct the paper path, and to avoid 
printing in the top and bottom one inch of the paper 
(the areas where the squashed line and 
misregistration problems will be the most apparent). 



Problems using 
labels or multipart 
forms 



Instruct the customer to use the bottom feed slot, 
and the pull tractor for the highest quality output, 
and to avoid backing out paper, especially labels and 
forms. (Backing out labels onto the push tractor may 
cause labels to peel off onto the platen or may 
dislodge a mylar guide inside the printer.) Cut the 
paper at a perforation, and advance the paper 
forward to remove pinfeed paper from the printer. 



Printing on the 
platen or over a 
perforation when 
using the push 
tractor 



when printing from a Macintosh and using the push 
tractor, set dip switch 2-8 ON to load paper beneath 
the bail (about 1 inch beyond the print line). This 
eliminates the possibility of printing on the platen 
or over a perforation when the printer driver 
executes its reverse linefeeds at the start of a print 
job. 

DIP switch 2-8 controls how far the paper is loaded 
into the printer. The default setting brings the 
paper up to the first printable line when you do an 
automatic paper feed with paper loaded on the push 
tractor. 



• Words touching or 
slightly overlapping 



- If tiie printer is being used with a Macintosh, 
update to version 2.0 or greater of the LQ driver. 



Page setup - if the customer notices a format difference in the 

problems between document when printing from an ImageWriter LQ, 

different printers and then from a LaserWriter, inform the customer 

that he must use Page Setup from the File menu each 
time a different kind of printer is used. Since the 
ImageWriter LQ and LaserWriter have different 
imageable areas (the ImageWriter page size is 
slightly larger than that on the LaserWriter), Page 
Setup is necessary to reformat the document for 
ImageWriter LQ printing. 



Cut Sheet Feeder 

• No access to second - Make sure to set your dip switches (2-5 and 2-6) 
or third bin for the number of bins you have installed (see Table 

10 in the Basics section). If these switches aren't 
set properly, the printer will not be able to access 
the second or third bin. The switches have to be set 
only once; if the Cut Sheet Feeder is removed to use 
pinfeed paper, you do not have to reset the 
switches. 



♦ Printer does not - The ImageWriter LQ expansion bin can either be 

recognize bin 3 the second or third bin of the Cut Sheet Feeder. 

If the gear configuration plug is left in, the bin 
will function as bin 2; if the gear configuration is 
removed, the bin becomes bin 3. 



• Paper skewed (bent) 
from expansion bin 3 



- Add 3.1 mm rubber bumpers to the bottoms of 

expansion bins 2 and 3. See Additional Procedures 
for correct placement. 



Documents going into - Bins are selected through the Options button on the 
wrong bins Print dialog box of the software being used. You 

can select up to two bins per job, but your 
application must spool the whole document as a job. 
Currently some applications treat each page of a file 
as a separate job, and all pages will come out of the 
bin selected under "First Sheet From." Other 
applications will allow you to print one job from 
two different paper bins. Have the customer check 
whether the application used supports multiple- 
bin feeding. 



Envelope feeding - Since envelopes generally are thicker than cut 

problems sheets, the customer must be aware of the 

following: 

• Make sure to adjust the paper thickness lever 
when printing envelopes. 

• Reset the paper thickness lever back to 
position 1 when you resume printing on cut 
sheets. 

• Because of the difference in paper thickness 
between cut sheet and envelopes, do not run cut 
sheets and envelopes in the same print job. 



□ SYMPTOM/CURE CHART 
Power Problems Solutions 



• Power light oft 
and no carrier 
motion 



Communication Problems 

• No printing or 
garbled printing 



Paper Feed Problems 
• No paper feed 



1. Test the primary fuse. If defective, replace it . 

2. Test the three secondary fuses. If any are defective, 
replace the defective oneCs) . 

3. Test the power switch. If defective, replace it . 

4. Replace the main board . 

5. Replace the transformer . 

6. Replace the noise filter PCA . 



Solutions 



- Perform the printer self-test. 

If the self-test passes, run the diagnostics to test 
the main board. 

If the self-test fails, replace the main board . 



Solutions 



1. Check the paper feed gear train and clear it if it is 
obstructed. 

2. Test the paper-handling change switch. If defective, 
re place it . 

3. Test the paper feed motor. If defective, replace it . 

4. Replace the main board . 



• Paper bail doesn 't 
automatically open 
and close 



1. Test the auto-load solenoid. If defective, replace it , 

2. Replace the main board . 



Carrier Problems 



Solutions 



Carrier moves 
at power on, but 
doesn't return to 
home position 



1. Test the home position switch. If defective, 
replace it . 

2. Perform the "Home Position Switch Adjustment," 
Section 3, Adjustments. 

3. Replace the main board . 



Power ligtit on, 
no carrier motion 



1. Check and, if obstructed, clear the carrier area. 

2. Test the carrier motor. If defective, replace it. 

3. Replace the main board . 



• Carrier strikes tlie 
rigiit-side frame 
wlien printing on 
4-part carbonless 
forms or printing on 
tfie perforated edge 
of tractor-feed paper. 



- Perform the "Card Guide Adjustment," Section 3, 
Adjustments. 



• Carrier moves 
at power on, but 
doesn't return to 
tiome position 



1. Test the home position switch. If defective, 
replace it . 

2. Perform the "Home Position Switch Adjustment," 
Section 3, Adjustments. 

3. Replace the main board . 



• Carrier stril<es 
tfie left-side frame 
on power up 
tiome position 



3. 



4. 



Test the home position switch. If defective, 
replace it. 

Perform the "Home Position Switch Adjustment," 
Section 3, Adjustments. 

Verify that the deflector pan is seated against the 
platen bar. If not, correct it. 
Replace the main board . 



Printing Probiems 

• Dots missing 1. Replace the print head. 

2. Replace the main board. 

3. Replace the print head to relay PCB cables. 

4. Replace the relay PCB to main logic cables 



Printing continues 
on a paper-out 
condition 



1. Test the paper-out sensor. If defectiye, replace it. 

2. Replace the main board. 

3. Replace the paper detect sensor. 



Carrier moves but 
no printing 



1. Replace the main board. 

2. Replace the print head. 



Mottling printed, 
ttie carrier doesn't 
move, and ttie power 
light is on 



- Perform the printer self-test. 

If the self-test passes, see Preliminary Checks, 
No Printing. 



If the self-test fails, replace the main board. 



Garbage printed 



Replace the main board. 



Printing too liglit 



1. Perform the "Print Head Gap Adjustment," Section 3, 
Adjustments. 

2. Perform the "Platen Gap and Parallelism 
Adjustment," Section 3, Adjustments. 



• Printing too dark 1. Perform the "Print Head Gap Adjustment," Section 3, 

Adjustments. 
2. Perform the "Platen Gap and Parallelism 
Adjustment," Section 3, Adjustments. 



• Printing continues 
witti front cover open 



1. Test the coyer-open sensor. If defectiye, replace 
the control panel PCA. 

2. Replace the main board. 



Color Printing Problems 



Color bleeding 



If the bleeding is consistent across the page, 

perform the "Color Ribbon Home Position 

Adjustment," Section 3, Adjustments. 

If the bleeding increases or decreases across the 

page, perform the "Color Ribbon Parallelism 
Adjustment," Section 3, Adjustments. 



Wrong color printed 



3. 



Test the color ribbon detect switch. If defective, 

replace the color ribbon motor assembly . 

Test the color ribbon home position switch. If 

defective, replace the color ribbon motor assembly . 

Test the color ribbon motor. If defective, replace 

the color ribbon motor assembly . 

Replace the main board . 



• Only one color 
is printed 



1. Test the color ribbon motor. If defective, replace 
the color ribbon motor assembly . 

2. Replace the main board . 



Other Problems 



Control panel switches 
don't work 



1. Test the control panel switches. 

replace the control panel PCA . 

2. Replace the main board . 



If defective, 



• Intermittent network 
problems— print head 
resets when idle and/or 
printer stops printing 



Replace ROM 02 on the logic board with 
ROM 03. 



□ TESTING THE PRIMARY AND SECONDARY FUSES 

Materials Required Digital multimeter 



Procedure l. Turn off the printer and remove the main cover. 

2. Remove the fuse to be tested and place a probe at 
each end of the fuse. 

The resistance of the fijse should be ohms; if the 

resistance is not, replace the fuse. 



□ TESTING THE POWER SWITCH 

Materials Required Digital multimeter 

Needlenose pliers 



Procedure l. Turn off the printer and remove the main cover. 

2. Remove the power switch from the case by pressing, 
with the needlenose pliers, the two plastic tabs at 
the sides of the switch and, at the same time, 
pushing the switch out of the case. 

3. Connect the multimeter between the two white 
wires of the power switch and toggle the switch on 
and off. 

When you turn the power switch on (1), the 
resistance should be ohms. When you turn the 
switch off (0), the resistance should be infinite. 

If the resistances are not as indicated, replace the 
power switch. 



4. Repeat step 3 for the black wires. 



□ TESTING THE HOME POSITION SWITCH 



Materials Required 



Digital multimeter 



Procedure 



1. Turn off the printer and remove the main cover. 

T 




FIGURE 1 

2. Disconnect the home position switch cable from 
main board connector CNIO (Figure 1, #1). 




FIGURE 2 



3. Connect the multimeter between pins 1 and 2 of the 
removed connector and toggle the home position 
switch (Figure 2, #1) with your finger. 

When you depress (close) the home position switch, 
the resistance should be ohms. When you release 
(open) the switch, the resistance should be infinite. 



If the resistances are not as indicated, replace the 
home position switch. 



□ TESTING THE CARRIER DRIVE MOTOR 

Materials Required Digital multimeter 

Procedure l. Turn off the printer and remove the main cover. 

(J) 







11^*11 








|||| «ffj„ C=3 ^Q^^ 







FIGURE 3 

2, Disconnect the carrier motor cable from main board 
connector CN5 (Figure 3, #1). 

3. Connect the multimeter between the pins of the 
removed connector listed below and verify that 
resistances are as shown. 

Pins to measure Resistance (Ohms) 



1 and 3 1.3 

1 and 5 1.3 

2 and 4 1.3 

2 and 6 1.3 

3 and 5 2.6 

4 and 6 2.6 



If the resistances are not as shown, replace the 
carrier motor. 



□ TESTING THE PAPER-HANDLING CHANGE SWITCH 

Materials Required Digital multimeter 



Procedure 



1. Turn off the printer and remove the main cover. 

T 




FIGURE 4 

2. Disconnect the paper-handling change switch cable 
from main board connector CN18 (Figure 4, #1). 




FIGURES 



3. Connect the multimeter between pins 1 and 2 of the 
removed connector and alternately depress and 
release the paper-handling change switch 
(Figure 5, #1). 

When the paper release lever is depressed, the 
resistance should be ohms. When the lever is 
released, the resistance should be infinite. 



If the resistances are not as shown, replace the 
paper-handling change switch. 



□ TESTING THE PAPER FEED MOTOR 

Materials Required Digital multimeter 

Procedure l. Turn off the printer and remove the main cover. 




FIGURE 6 

2. Disconnect the paper feed motor cable from main 
board connector CN6 (Figure 6, #1). 

3. Connect the multimeter between the pins of the 
removed connector listed below and verify that 
resistances are as shown. 

Pins to measure Resistance f Ohms) 



1 and 3 20 

1 and 5 20 

2 and 4 20 

2 and 6 20 

3 and 5 40 

4 and 6 40 



If the resistances are not as shown, replace the 
pap^r f^^d mqXQv. 



□ TESTING THE AUTO-LOAD SOLENOID 



Materials Required 



Digital multimeter 



Procedure 



1. Turn off the printer and remove the main cover. 




2. Disconnect the auto-load solenoid cable from main 
board connector CN8 (Figure 7, #1). 

3. Connect the multimeter between pins 1 and 2 of the 
removed connector, and then between pins 2 and 3. 

The resistance between pins 1 and 2 and between 
pins 2 and 3 should be infinite. 

If the resistances are not as indicated, replace the 
auto-load SQlenoid. 




FIGURE 7 



□ TESTING THE PAPER-OUT SENSOR 



Materials Required 



Digital multimeter 



Procedure 



1. Turn off the printer and remove the main cover. 



FIGURE 8 



2. Disconnect the paper-out sensor cable from main 
board connector CN9 (Figure 8, #1). 




FIGURE 9 

3. Connect the multimeter between pins 4 and 5 of the 
removed connector and alternately raise and release 
the paper-out sensor arm (Figure 9, #1). 

When you raise the paper-out sensor arm, the 

resistance should be ohms. When you release the 
paper-out sensor arm, the resistance should be 
infinite. 

If the resistances are not as indicated, replace the 
paper-out sensor. 



□ TESTING THE COVER-OPEN SENSOR 



Materials Required 



Digital multimeter 



Procedure 



1. Turn off the printer and remove the main cover. 



2. Connect the multimeter between pins 1 and 13 of 
the removed connector and open and close the front 
cover. 

When you close the front cover, the resistance 
should be ohms. When you open the front cover, 

the resistance should be infinite. 

If the resistances are not as indicated, replace the 
control panel PCA. 



□ TESTING THE COLOR RIBBON DETECT SWITCH 



Materials Required 



Digital multimeter 



Procedure 



1. Turn off the printer and remove the main cover. 




FIGURE 10 

2. Disconnect the color ribbon assembly cable from 
main board connector CN7 (Figure 10, #1). 



FIGURE 11 



Connect the multimeter between pins 7 and 8 of the 
removed connector, and alternately depress and 
release the color ribbon detect switch (Figure 11, #1). 

When you depress the color ribbon detect switch, the 

resistance should be ohms. When you release the 
switch, the resistance. should be infinite. 



If the resistances are not as indicated, replace the color 
ribbpn detect switch, 



□ TESTING THE COLOR RIBBON HOME POSITION SWITCH 

Materials Required Digital multimeter 

Procedure l. Turn off the printer and remove the main cover. 




FIGURE 12 

2. Disconnect the color ribbon assembly cable from 
main board connector CN7 (Figure 12, #1). 

3. Connect the multimeter between pins 9 and 10 of 
the removed connector and alternately rotate the 
front carrier shaft completely forward and then back 
slightly. 

When you rotate the shaft completely toward you, 
closing the switch, the resistance should be ohms. 
When you rotate the shaft slightly forward, opening 
the switch, the resistance should be infinite. 



If the resistances are not as indicated, replace the 
color ribbon motor assemblv. 



□ TESTING THE COLOR RIBBON MOTOR 

Materials Required Digital multimeter 

Procedure l. Turn off the printer and remove the main cover 




FIGURE 13 

2. Disconnect the color ribbon assembly cable from 
main board connector CN7 (Figure 13, #1). 

3. Connect the multimeter between the pins of the 
removed connector listed below, and verify that 
resistances are as shown. 

Pins to measure Resistance fOhms^ 



1 and 3 70 

1 and 5 70 

2 and 4 70 

2 and 6 70 

3 and 5 140 

4 and 6 140 



If the resistances are not as indicated, replace the 
color ribbon motor assembly. 



□ TESTING THE CONTROL PANEL SWITCHES 



Materials Required Digital multimeter 

Procedure l. Turn off the printer and remove the main cover. 

2. Place the cover top-down on a padded work surface. 

3. Connect the multimeter between the pins of the 
control panel PCA connector listed below and check 
to see if the resistance reads ohms when the 
corresponding control panel switch is depressed. 
Refer to Figure 14 to determine the location of each 
pin. 



Switch Check pins 

Select switch 10 & 13 

Print quality switch 9 & 13 
Line feed switch 11 & 13 

Form feed switch 12 & 13 

pin#13 pin#1 




FIGURE 14 



If any switch fails to show ohms when depressed, 

replace the control panel PCA. 



# Apple Technical Procedures 



ImageWriter LQ 



Section 5 - Diagnostics 



□ C0r4TENTS 



5.2 
5.2 
5.3 
5.4 
5.4 
5.4 
5.5 
5.5 
5.6 



Introduction 

Test Descriptions 

Printer Configuration 

Keyboard Equivalents 

Tips for Using PrintTest LQ 

Control Panel Switch Reference 



Equipment Setup 
Printer Setup 
Computer Setup 



5.7 Main Logic Board Test 

5.8 Carrier Movement Test 

5.9 Print Pins Test 

5.10 Print Test - Narrow 
5.12 Print Test - Wide 

5.15 Horizontal Registration Test 



Note: If a step is underlined, detailed instructions for 
that step can be found in Section 2, Take-Apart. 



□ INTRODUCTION 



Diagnostics for the ImageWriter LQ are available in 
two forms — built-in and disk-based. Built-in tests 
include a narrow and wide print test, a carrier 
movement test, a horizontal print registration test, and 
a print pins test. (These tests are described ^further 
under "Test Descriptions" later in this section.) A disk- 
based diagnostic called PrintTesf^^ LQ includes these 
same tests; in addition, it enables you to test the 
printer's serial interface and main logic board. 

Note: These procedures apply to version 1.3. If you 
have an earlier version, contact your Apple Support 
Center for an update. 

Table 1 summarizes the available tests and tells where 
they are available. 

TABLE 1 
IMAGEWRITER LQ 
DIAGNOSTIC TESTS 



Computer- 
Test Staadalone Assisted 

Main Logic Board X 

Carrier Movement X X 

Print Pins X X 

Print Test - Narrow X X 

Print Test - Wide X X 

Horizontal Registration X X 



Test The six diagnostic tests, along with the problems they 

Descriptions identify, are briefly described below. 



Main Logic 
Board Test 



This nonprinting test verifies operation of the main 
logic board. It is used to identify a nonfunctioning or 
intermittently functioning main logic board. 



Carrier This nonprinting test initiates carrier movement from 

Movement one end of the platen to the other, between the times 

Test the platen and tractor rotate. Uneven mechanical 

movement indicates damaged, dirty, or worn mechanical 

parts. 



Print This test prints a series of lines, one line generated by 

Pins Test each of the 27 print pins. One or more missing or 

incomplete lines indicates bent, broken, or misfiring 

print pins. 



Print Test- This option prints an 8.5-inch-wide printout containing 

Narrow the results of the self-test followed by a repeating 

pattern of letters, numbers, and special characters. 
These characters are repeated in a pattern called 
"barber-pole" — in reference to its rotating and twisting 
illusion. Use this test as a substitute for the wide print 
test when you don't have access to 15-inch paper. 



Print Test— This option prints a 13. 6- inch-wide printout containing 

Wide the results of the self-test followed by a repeating 

pattern of letters, numbers, and special characters. 
These characters are repeated in a pattern called 
"barber-pole" — in reference to its rotating and twisting 
illusion. Use this test when performing the Print Head 
Gap, Color Ribbon Home Position, or Color Ribbon 
Parallelism Adjustment. (Refer to Section 3, 
Adjustments.) 



Horizontai This test prints a series of vertical lines in both the 

Registration right-to-left and left-to-right printing directions. Each 

Test series of vertical lines is labeled with a DIP switch 

setting. Uneven print alignment can be corrected by 
selecting the appropriate DIP switch setting. Refer to 
"Horizontal Registration Adjustment," Section 3, 
Adjustments, for additional information. 

This test is also used in performing the home position 
switch adjustment described in Section 3, Adjustments. 



Printer 

Configuration 



The Configurations menu item under Options is used to 
display the ROM version and baud rate of the printer. 



Note: PrintTest LQ can be used with either version 
00 or version 01 ROM. However, the Horizontal 
Registration test is not available with version 00. 



Keyboard 
Equivalents 



This is a list of the keyboard equivalents that may be 
used to invoke menu selections. 



Menu Item 

Configuration 
Test Selections 
Quit 



Keyboard Equivalent 
*-T 



Tips for Using 
PrintTest LQ 



Here are a few tips to keep in mind while running 
PrintTest LQ. 

• Be sure that the printer select light is on before 
starting any of the tests or selecting Configuration 
under the Options menu. 

• Do not cycle the printer on and off during a test or 
while requesting the configuration from the printer. 

• If a test is started while the select light is off, or if 
the printer is turned off during a test, do the 
following to resume testing: 

a) Turn off the printer until the "Start" button 
reappears on the computer screen. 

b) Turn on the printer, make sure the select light 
comes on, and then rerun the test. 

c) Until you have rerun the test, ignore any error 
messages displayed by the diagnostic. 



Control Panel The control panel switches can be used at printer 

Switch Reference power-on to invoke all the diagnostic tests, with the 

exception of the main logic board test, without the 
need for a Macintosh computer. The following table 
provides a quick reference of the tests and the 
switches to depress to invoke them. 



TABLE 2 

IMAGEWRITER LQ CONTROL PANEL 
SWITCH FUNCTIONS 



Test 

Main Logic Board 
Print Test - Narrow 
Print Test - Wide 
Carrier Movement 
Horizontal Registration 
Print Pins 



Unavailable 
Form-feed 

Form-feed and Line-feed 

Line-feed 

Form-feed, Line-feed, and Select 
Line-feed and Select 



□ EQUIPMENT SET UP 

Printer Set up the 

Setup any of the 

assisted or 



ImageWriter LQ printer before performing 
diagnostics tests in either mode — computer- 
standalone. 



Materials Required Power cord 

Color ribbon 

Several sheets of 8.5- x 11-inch white paper 
Several sheets of 11- x 15-inch white paper 
DIP switch setter 



Standalone l. If the printer power switch is on, turn it off. Plug 

Mode in the printer. 

2. Install the color ribbon, if necessary. (Refer to 
"Install the Ribbon Cartridge," Section 1, Basics.) 

3. Load a sheet of 8.5- x 11-inch paper. (Refer to "Load 
and Remove Paper," Section 1, Basics.) 

Note: If you will be using the wide print test, use 
the 11- X 15-inch paper. 

4. Push the paper thickness lever toward the back of 
the printer to the number-one position. 



5. 



Turn off the printer. 



If you will be running diagnostics from a Macintosh 
computer, make sure DIP switch 2-4 is set to OFF 
while testing the printer. Do so even if an AppleTalk 
option card is installed. Otherwise, the diagnostic will 
be unable to communicate with the printer. 

Set up a Macintosh computer for all computer-assisted 
diagnostic tests. 

Macintosh Plus, SE, SE/30, II, IIx, or Ilex computer 

Power cord 

Mouse 

Keyboard and cable 

Monitor, power cord, video card, and cable (Macintosh 

II, IIx, and Ilex only) 
Serial Interface Cable (Peripheral-8) 
Macintosh Peripheral Tests disk (Version 1.3 or later) 



1. Set up the ImageWriter LQ as described in "Printer 
Setup." 

2. Set up the Macintosh computer. (If you need 
assistance, refer to the user's guide for the 
Macintosh you are using.) 

3. Plug one end of the serial interface cable into the 
printer port of the computer and the other end into 
the printer's serial interface socket. (Refer to 
"Connecting the ImageWriter LQ to Your Macintosh 
Computer" in ImageWriter LQ Owner's Guide for 
further information.) 

4. Turn on the printer, and make sure the green Power 
and Select indicator lights come on. 

5. Turn on the computer with the Macintosh Peripheral 
Tests disk in the disk drive. 

6. Double-click the Macintosh Peripheral Tests disk to 
open the disk. 

7. Double-click the PrintTest LQ icon to launch the 
diagnostic. 



□ MAIN LOGIC BOARD TEST 



Computer- 
Assisted Mode 



1. Complete the printer and computer setup 
procedures. 

2. Select Test Selections from the Options menu. 

3. Select Main Logic Board Test. Verify that all other 
tests are deselected. 

If you would like to run the test repeatedly, click 
Loop on Selections. 

4. Click OK to return to the startup screen. 

5. Click Start or press < Return > to begin the test. 



Standalone 
Mode 



The Main Logic Board Test is not available in the 
standalone mode. 



Test 
Results 



No printout will be generated for this test. On-screen 
prompts will indicate if the main logic board is 
functioning correctly. 



Corrective 
Action 



If the main logic board fails the test, replace the main 
logic board . 

Complete the remaining diagnostic tests to ensure that 
the printer is operating correctly and is in proper 
adjustment. 



□ CARRIER MOVEMENT TEST 



Computer- 
Assisted Mode 



1. Complete the printer and computer setup 
procedures. 

2. Select Test Selections from the Options menu. 

3. Select Carrier Movement Test. Verify that all other 
tests are deselected. 

If you would like to run the test repeatedly, click 
Loop on Selections. 

4. Click OK to return to the startup screen. 

5. Click Start or press <Return > to begin the test. 



Standalone 
Mode 



1. Complete the printer and computer setup 
procedures. 

2. Turn on the printer while holding down the Line- 
feed switch. Then release the switch. 



Test 
Results 



No printout will be generated for this test. To pass 
this test, the carrier should move smoothly across the 
entire length of the platen from one end to the other. 
As the carrier moves, the platen and tractor should 
rotate one or two lines. 



Corrective 
Action 



1. If the printer does not pass this test, refer to 
Section 6, Troubleshooting, to identify which parts 
of the mechanical assembly require maintenance, 
repair, or replacement. 

2. Complete the remaining diagnostic tests to ensure 
that the printer is operating correctly and is in 
proper adjustment. 



□ PRINT PINS TEST 

Computer- 
Assisted Mode 



1. Complete the printer and computer setup 
procedures. 

2. Select Test Selections from the Options menu. 

3. Select Print Pins Test. Verify that all other tests 
are deselected. 

If you would like to run the test repeatedly, click 
Loop on Selections. 

4. Click OK to return to the startup screen. 

5. Click Start or press < Return > to begin the test. 



Standalone 
Mode 



1. Complete the printer and computer setup 
procedures. 

2. Turn on the printer while holding down the Line- 
feed and Select switches. Then release both 
switches. 



Test 
Results 



1. Turn off the printer when it stops printing. 

2. Remove the printout and compare it to the sample 
shown in Figure 1. 



-1 yj - 
-14- 

.-le. 



-1 1 - 

-15- 
J.9. 
.23. 
2.7 



- H- 
--1 6- 



-10- 
-14.- 

-IS- 



-1 1 - 

_19_ 

_23 



- e- 

-1 2- 
-16- 



26 



FIGURE 1 



The printout will show the numbers 1 through 27, 
one number for each print pin. A line will be 
printed after each number. Two sets of numbers and 
lines will be printed. 

To pass this test, each pin (indicated by numbers 1 
through 27) must print a complete line. 

Corrective l. if one or more print pins do not print or print an 

Action incomplete line, refer to "Dots Missing," in the 

Symptom/Cure Charts in Section 6, Troubleshooting, 
to determine the cause of the failure. 

2. Complete the remaining diagnostic tests to ensure 
that the printer is operating correctly and is in 
proper adjustment. 



□ PRINT TEST - NARROW 



Computer- 
Assisted Mode 



1. Complete the printer and computer setup 
procedures. 

2. Select Test Selections from the Options menu. 

3. Select Print Test (narrow). Verify that all other 
tests are deselected. 

If you would like to run the test repeatedly, click 
Loop on Selections. 

4. Click OK to return to the startup screen. 

5. Click Start or press < Return > to begin the test. 



Standalone 
Mode 



1. Complete the printer and computer setup 
procedures. 

2. Turn on the printer while holding down the Form- 
feed switch. Tlien release the switch. 



Test 
Results 



1. Turn off the printer when it stops printing. 

2. Remove the printout and compare it to the sample 
shown in Figure 2. 

SELFTEST 
ROMREVCOl) ; 

RAM- OKE : DIPSW Setting 1-On , 0-0£f , X-Don t care ; 
* means current setting of DIP switches, 



DIPSWtl 



123 
000 
100 
010 
110 
001 
101 

oil 
111 

4 




5 


1 

il 

00 
10 
01 

11 



(National Character Set) 

American 

Italian 

Danish 

British 

German 

Swedish 

F r e nc h 

Spanish 

(Form Length) 

llinches 

12inches 

(Perforation Skip) 

Inactive 

Active 

(Default Character Pitch) 

lOcpi 

12cpi 

17cpi 

160dpi(DRAFT.NLQ) 
216dpi(LQ) 



(Carriage Return Function) 

CR only 

CR+LF 



12 (Baud Rate Setting) 

00 19200 

10 1200 

01 2400 

11 9600 



3^ (Asynchronous Protocol) 

Hardware Handshake 

1 XON/XOFF 

4 (Option Board) 

Option Disabled 

1 Option Enabled 

567 (CSF Configuration) 

001 Ibin 

101 2bin 

Xll 3bin 

000 Ibin+EnvGlope 

100 2bin+Envelope 

XIO 3bin+Envelope 

8 (Auto Load Position) 

Load to first printable line 

1 Load to ball position 









'iNOPDRSTuvi^XYZi \] sdcde-foh 


i.iK ! mnoDor- 


' 0123456789 : ; 


■ - HbUHh- to 




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k ^ mnopqr£'.u 


#f/.-: ::2:45a7S9— = 


■■ ■•'i?ABULiEi-bH i 




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'OR RTu V :ll J 8 13 C J G T r -, j 'v . 


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RSTUVyXYZC- J ■■• 'aDcde-Fghi jkl n- 


I'^HZ-^StL'VW 








81 UVWXYZC \ J ■■ ' aDcidef qh i.iK ! fir 


□pqrsruvw;-. y 






^iOPORF 


TUVUIX YZ [ \ J ■■' aocaef qn ijK ] mnc 


pqrstLiywK vz 








^VbJXYZ-\j ■ ' adcdetgh 1 ji: 1 mnoc 


qrstLivw:: yz ■ 








vWXYZl' r ■ ^abcdetqni u-. i TinoDG 


rsTiuvwKyz =. 


*-r - , f -.J l^o^ Z'o / a'y ; ° •• = •■• • if M.r^u i. 






IL I Ezzcs*gri: ■ mriODq- 


Er"_ >z : . 














3Hl.:KL_HMuP3n 




iZZ j ■ aocnp-f ghi jK 1 mnopqrst 










Z [ \ : • an -detqn i^K i mnopq-stL 














/O 123456789? : ^= >7@AECDEF3HI 


JKLnNUpPRSTU 








0123450787 -^^'OhBCDEFG- L: 






: "■ ^aDcce-fgnijk [ mnoparsLuvw:-: 


.1. "1*- 










Z C i n^j-. 


23456739 t < =■ :-§A&CDEFGri I JKl 




T Z [ \ I 


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345t7b- : I ~ I.^r.I2E'=''3hI _> l--" 






adcdeigni jk i mnopqrstuvwK yz i 


i}^" : 


456"'£9:: = ' .:-P'IIFF3- . 0. 






sDccetgn i jK 1 mnopqrstuvwKyz ■'. ■ 










bcoe-f c-n i i ' : 1 mnooq'^stuvwK vz { ■ '■ 





FIGURE 2 



The first part of the printout shows the results of 
the self-test. This will be followed by repeating 
letters, numbers, and special characters printed in a 
"barber-pole" pattern. 



Corrective 
Aotion 



Check each line of underscored characters for any of 
the following conditions: 



1. If part of a row of characters or the underline is 
evenly printed in a second color, perform the "Color 
Ribbon Home Position Adjustment," Section 3, 
Adjustments. 

2. If a second color prints on an angle, across a row of 
characters or an underline, perform the "Color 
Ribbon Parallelism Adjustment," Section 3, 
Adjustments. 

3. If the print density varies from one side of the 
printout to the other, perform the "Print Head Gap 
Adjustment," Section 3, Adjustments. 

4. Complete the remaining diagnostic tests to ensure 
that the printer is operating correctly and is in 
proper adjustment. 



□ PRINT TEST -WIDE 



Computer- 
Assisted Mode 



1. Complete the printer and computer setup 
procedures. 

2. Select Test Selections from the Options menu. 

3. Select Print Test (wide). Verify that all other tests 
are deselected. 

If you would like to run the test repeatedly, click 
Loop on Selections. 

4. Click OK to return to the startup screen. 

5. Click Start or press <Return> to begin the test. 



Standalone 
Mode 



1. Complete the printer and computer setup 
procedures. 

2. Turn on the printer while holding down the Form- 
feed and Line-feed switches. Then release both 
switches. 



Test 1. Turn off the printer when it stops printing. 

Results 

2. Remove the printout from the printer and compare it 
to the sample shown in Figure 3. 

The first part of the printout shows the results of 
the self-test. This will be followed by repeating 
letters, numbers, and special characters printed in a 
"barber-pole" pattern. 



SELFTEST 
ROMREVCOl): 

RAM- 0KB ! DIPSW Setting i-On. 0-Of f . X-Don' t care : 
" means current setting of DIP switches. 



DIPSWtl 

123 (National Character Set) 

" 000 American 

100 Italian 

010 Danish 

110 British 
001 German 

101 Swedish 

011 French 

111 Spanish 

4 (Form Length) 

• G ilinches 
1 121 no has 

5_ (Perforation Skip) 

• Inactive 

I Active 

67 (Default Character Pitch) 

00 lOcpi 

• 10 12cpi 

01 17cpi 

II 160dpi (DRAFT, NLQ) 
216dpi(L0) 



8 (Carriage Return Function) 

• CR only 

1 CR+LF 



DIPSWt2 

12 (Baud Rate Setting) 
• 00 19200 

10 1200 
01 2400 

11 9600 



2 (Asynchronous Protocol) 

" Hardware Handshake 

i XON/XOFF 

4 (Option Board) 

" Option Disabled 

1 Option Enabled 

567 (CSF Configuration) 

001 Ibm 

101 2bin 

Xll 3bln 

• 000 Ibin+Envelope 

100 2bln+Envelope 

XIO 3bin+Envelope 

8 (Auto Load Position) 

■ Load to first printable line 

1 Load to bail position 



2i23i5iiZS9jLJ 



^5b-dsfqn i. iK;fTinQpqrsru 



m 



:iLF^^^i.::-.._:--nprRc-:,_.,^vY7rx 



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: GA789:r ,^.:?^ABCDFF3: 



yyyjmE2^im 



FIGURES 



Corrective 
Action 



Check each line of underscored characters for any of 
the following conditions: 



1. If part of a row of characters or the underline is 
evenly printed in a second color, perform the "Color 
Ribbon Home Position Adjustment," Section 3, 
Adjustments. 

2. If a second color prints on an angle, across a row of 
characters or an underline, perform the "Color 
Ribbon Parallelism Adjustment," Section 3, 
Adjustments. ^ 

3. If the print density varies from one side of the 
printout to the other, perform the "Print Head Gap 
Adjustment," Section 3, Adjustments. 

4. Complete the remaining diagnostic tests to ensure 
that the printer is operating correctly and is in 
proper adjustment. 



) 



□ HORIZONTAL REGISTRATION TEST 



Computer- l. Complete the printer and computer setup 

Assisted Mode procedures. 

Note: To ensure the accuracy of this test, be sure 
the left edge of the paper lines up with the red line 
on the paper bail. 

2. Select Horizontal Registration Test. Verify that all 
other tests are deselected. 

If you would like to run the test repeatedly, click 
Loop on Selections. 

3. Click OK to return to the startup screen. 

4. Click Start or press < Return > to begin the test. 



Standalone l. Complete the printer setup procedures. 

Mode 

2. Turn on the printer while holding down the Form- 
feed, Line-feed, and Select switches. Then release 
all three switches. 



Test 1. Turn off the printer when it stops printing. 

Results 

2. Reload the printout into the printer. 

Note: Be sure the left edge of the sheet of paper is 
aligned with the red line on the paper bail. 

3. To pass the Horizontal Registration Test, the 
horizontal registration and the home position switch 
must be checked. 



a) Check the alignment of the vertical line printed 
closest to the left margin with the black line on 
the paper bail. For the home position switch to 
be in proper adjustment, both lines must be in 
alignment. 



b) Remove the printout and compare it to the 
sample shown in Figure 4. An asterisk (*) will 
indicate the current setting of DIP switches S3 
positions 6, 7, and 8. For horizontal registration 
to be in proper adjustment, the asterisk must be 
next to the DIP switch setting with the 
straightest vertical lines. 

1 I V 



J I 



* 



i 



i i 



i 1 



FIGURE 4 



Corrective l. if liorizontal registration is not adjusted properly, 

Action perform the "Horizontal Registration Adjustment," 

Section 3, Adjustments. 

2. If the home position switch is not adjusted properly, 

perform the "Home Position Switch Adjustment," 
Section 3, Adjustments. 

3. Complete the remaining diagnostic tests to ensure 
that the printer is operating correctly and is in 
proper adjustment. 



4 Apple Technical Procedures 

ImageWriter LQ 

Section 6 - Preventive IVIaintenance 



□ CONTENTS 



6.3 


Maintenance Schedule 


6.4 


Getting Started 


6.5 


As-Needed Maintenance 


6.6 


Six-Month Maintenance 


6.8 


After-Take-Apart Maintenance 


6.8 


Introduction 


6.8 


Right- and Left-Side Frame 


6.10 


Pinch Roller 


6.12 


Ribbon Clutch Gear 


6.13 


Tractor 


6.14 


Platen and Paper-out Sensor 


6.16 


Carrier 



Note: If a step is underlined , detailed instructions 
for that step can be found in Section 2, Take- Apart. 



□ MAINTENANCE SCHEDULE 



Table 1 summarizes the recommended maintenance 
intervals. 

TABLE 1 

I MAINTENANCE SCHEDULE 

OPERATOR — AS NEEDED 

' DEALER SERVICE — Every six months 



DEALER SERVICE — Only after take-apart 







X 


Lubricate carrier 






X 


Lubricate platen and clean paper-out sensor 






X 


Lubricate tractor 






X 


Lubricate ribbon clutch gear 






X 


Lubricate pinch roller 






X 


Lubricate right- and left-side frames 




X 


X 


Clean print head 




X 


X 


Clean and lubricate carrier shaft 


X 


X 


X 


Clean platen and paper bail rollers 


X 


X 


X 


Vacuum out dust and paper particles 


X 


X 


X 


Clean cover and external plastic parts 


X 


X 


X 


Check print quality 



□ GETTING STARTED 

Materials Required None 



Procedure l. Make sure the power is off (Figure 1, #1). 

2. Open the front cover (Figure 1, #2) and then the 
back cover (Figure 1, #3) of the printer. 

3. Remove the paper and the ribbon cartridge 
(Figure 1, #4). (Refer to Section 1, Basics.) 




FIGURE 1 



□ AS-NEEDED MAINTENANCE 



Materials Required Lint-free cloth 

Isopropyl alcohol 

Mild detergent-and-water solution 
Shop vacuum 

Procedure Complete the following maintenance procedure as 

needed and as part of the "Six-Month" and "After-Take- 
Apart" maintenance procedures. 

1. Complete the "Getting Started" procedure. 

2. Vacuum out any dust, paper particles, or dirt from 
inside the printer. 

3. Clean the platen surface and paper bail rollers with 
a lint- free cloth moistened with alcohol. 

4. Load the paper and the ribbon cartridge. (Refer to 
Section 1, Basics.) 

5. Close the back cover and then the front cover. 

6. Clean the cover surfaces and external plastic parts 
with a cloth moistened with a mild detergent-and- 
water solution. 

7. Perform the Color Alignment and Print Head Gap 
Tests to check print quality. (Refer to Section 5, 
Diagnostics.) 



□ SIX-MONTH MAINTENANCE 



Materials Floil G-488 

Lint-free cloth 



Lint-free cotton swab 
Isopropyl alcohol or Freon 



The following maintenance procedure should be 
performed every six months. (It is also performed at 
the end of the After-Take-Apart Maintenance 
procedure.) 



Procedure 



1. Complete the "Getting Started" procedure. 




FIGURE 2 



To clean the print head (Figure 2, #1): 

a) Push the paper thickness lever (Figure 2, #2) 
toward the front of the printer to the number 
five position. 

b) Remove the card guide (Figure 2, #3). 

c) Gently wipe the print head with a cotton swab 
moistened with alcohol or freon (Figure 2, #1). 

d) Replace the card guide (Figure 2, #3). (Perform 
the Card Guide Adjustment - see Section 3, 
Adjustments.) 

Wipe old oil and dirt off the carrier shaft 
(Figure 2, #4) with a lint-free cloth. 

Lubricate the carrier shaft by applying four drops of 
Floil G-488 to each felt wiper located under the 
carrier assembly (Figure 2, #5). 

Complete the "As Needed" maintenance procedure. 



□ AFTER-TAKE-APART MAINTENANCE 



Materials Required Floil G-488 

Floil 947-P 
Molykote BR2-S 
Small, soft brush 
Lint-free cloth 



Introduction After taking apart any of the following assemblies, 

follow the appropriate preventive maintenance 
instructions (for that assembly only) in this section: 

• Right- and Left-Side Frame 

• Pinch Roller 

• Ribbon Clutch Gear 

• Tractor 

• Platen and Paper-out Sensor 

• Carrier 

After servicing the part in question, you should also 
complete the "As-Needed Maintenance" and "Six-Month 
Maintenance" procedures before returning the printer 
to the customer. 



Right- and Left- l. Complete the "Getting Started" procedure. 

Side Frame 

2 Clean the parts identified (Figure 3, #1) by wiping 
off any old oil and dirt with a lint-free cloth. 

3. Lubricate each lubrication point identified 
(Figure 3, #1) with one drop of Floil G-488. 

4. Complete the maintenance procedure for any other 
assemblies taken apart. 

5. Replace the mechanical parts . 



6. 



Complete the "As-Needed Maintenance" and "Six- 
Month Maintenance" procedures. 




FIGURE 3 



Pinch 1. Complete the "Getting Started" procedure. 

Roller 

2. Clean the parts identified (Figure 4, #1) by wiping 
off any old oil and dirt with a lint-free cloth. 

3. Lubricate each lubrication point identified 
(Figure 4, #1) with one drop of Floil G-488. 

4. Complete the maintenance procedure for any other 
assemblies taken apart. 

5. Replace the mechanical parts . 

6. Complete the "As-Needed Maintenance" and "Six- 
Month Maintenance" procedures. 



Ribbon Clutch l. Complete the "Getting Started" procedure. 

Gear 

2. Clean the parts identified (Figure 5, #1) by wiping 
off any old oil and dirt with a lint-free cloth. 

3. Lubricate each lubrication point identified (Figure 5, 
#1) with one drop of Floil G-488. 

4. Complete the maintenance procedure for any other 
assemblies taken apart. 

5. Replace the mechanical parts . 

6. Complete the "As-Needed Maintenance" and "Six- 
Month Maintenance" procedures. 




FIGURES 



1. Complete the "Getting Started" procedure. 

2. Clean the parts identified (Figure 6, #1) by wiping 
off any old oil and dirt with a lint-free cloth. 

3. Lubricate each lubrication point identified 
(Figure 6, #1) with a coating of Molykote BR2-S. 

4. Complete the maintenance procedure for any other 
assemblies taken apart. 

5. Replace the mechanical parts . 

6. Complete the "As-Needed Maintenance" and "Six- 
Month Maintenance" procedures. 




FIGURE 6 



Platen and l. Complete the "Getting Started" procedure. 

Paper-out 

Sensor 2. Clean the parts identified (Figure 7, #1 and #2) by 

wiping off any old oil and dirt with a lint-free cloth. 

3. Lubricate each platen lubrication point identified 
(Figure 7, #1) with one drop of Floil G-488. Do not 
lubricate the paper-out sensor (Figure 7, #2). 

4. Complete the maintenance procedure for any other 
assemblies taken apart. 

5. Replace the mechanical parts. 

6. Complete the "As-Needed Maintenance" and "Six- 
Month Maintenance" procedures. 



Carrier l. Complete the "Getting Started" procedure. 

2. Clean the carrier shafts (Figure 8, #1 and #2) by 
wiping off any old oil and dirt with a lint-free cloth. 

3. Lubricate each lubrication point (Figure 8, #3) with 
one drop of Floil G-488. Lubricate the remaining 
lubrication points (Figure 8, #2) with one drop of 
Floil 947-P. 

4. Complete the maintenance procedure for any other 
assemblies taken apart. 

5. Replace the mechanical parts. 

6. Complete the "As-Needed Maintenance" and "Six- 
Month Maintenance" procedures. 



) 



fk Apple Technical Procedures 

ImageWriter LQ 

Section 7 - Additional Procedures 



□ CONTENTS 



7.3 Interrupter Switch Modification 

7.3 Materials Required 

7.4 Remove Home Position Switch 

7.5 Remove Stepper Motor Screws 

7.5 Install Position Sensor Assembly 

7.6 Install Interrupter 

7.8 Install Ribbon Lift Bail Clip 

7.9 Adjustment Check 

7.10 Cut Sheet Feeder 

7.10 Gear Configuration Plug 

7.12 Expansion Bin Bumper Placement 



□ INTERRUPTER SWITCH MODIFICATION 



The purpose of the Interrupter Switch Modification is 
to prevent the print head from printing beyond the 
right side (column 156 at 12 characters per inch) of the 
platen, if interference should occur. Interference can 
occur if the print head is forced beyond its print margin 
and the carriage bumps into the side frame. Currently 
any interference on the left side will deselect the 
printer and prevent any further print motion. This new 
modification will also deselect the printer should the 
print head reach the right-side frame. This condition 
can occur when: 

• there is a paper or ribbon jam 

• the printer prints on the perforation (the tear-off 
line between sheets), or 

• the paper thickness lever is not set correctly. 

Installing the interrupter switch modification requires 
that the following steps be taken: 

1. Removal of the home position switch 

2. Replacement of three screws on the stepper motor 

3. Installation of the new position sensor assembly (in 
place of the home position switch) 

4. Installation of the interrupter device on the drive 
belt 

5. Installation of the plastic clip on the ribbon lift bail 



Materials Required Phillips screwdriver (magnetic is helpful) 

Home position switch kit 
Diagonal cutters 
Flatblade screwdriver 
Small needlenose pliers 



Remove Home l. Remove the top cover. 

Position Switcli 



Clip all tie wraps around the bundle of wires along 
the left side of the printer, going from the motors 
and switches to the main logic board. 

Follow the two wire leads from the home position 
switch that go around the left side of the stepper 
motor and lead to connector CN 10 (Figure 1, #1) on 
the back of the logic board. Unplug the connector at 
CNIO. 




FIGURE 1 



Using a phillips screwdriver, remove the screw 
(Figure 2, #1) that holds the home position switch 
(Figure 2, #2) in place. Save this screw, as you will 
use it for the new switch. 




FIGURE 2 



5. 



Remove the home position switch, and pull the two 
wires from the switch through the small hole at the 
bottom of the left frame. 



Remove Stepper 
Motor Screws 



Install Position 
Sensor Assembly 



1. Remove the three screws (Figure 1, #2) from the 
stepper motor. 

Note: Do not remove or lift up on the motor while 
the screws are out. Doing so will necessitate a 
readjustment of the drive belt. 

2. Install the three new screws from the upgrade kit. 

Note: This step must be done before going any 
farther. 



1. Run the connecter and wire through the small hole 
on the bottom-left carriage plate, so that the wire 
can be laid alongside the stepper motor and lead to 
the back of the PCB where connector CNIO is 
located. 

2. Position the sensor assembly (Figure 3, #1) the 
same way as the old home position switch, making 
sure the pilot pin (Figure 3, #2) in the assembly 
goes into the hole above the screw hole (Figure 1, 
#3). Secure the assembly with the one screw. This 
is the adjustment screw and will be used to 
correctly position the switch later. 




FIGURES 



3. Plug in the connector to CNIO. 



Install Interrupter 



1. Move the print head all the way to the right side of 
the carriage. 



2. Position the interrupter device (Figure 4) on 
the black rubber drive belt in the following way: 



Side view ^^^^^ view 




FIGURE 4 



a) If the pins are not bent already, prebend the top 
pins to a 45-degree angle and the bottom pin to 
90 degrees as shown in Figures 5 and 6. 




Grooved side of 
belt 



FIGURES 



FIGURE 6 



b) Look at the left front of the drive belt. Position 
the middle pin of the interrupter on the fourth 
groove of the belt from the side frame. (See 
Figure 7.) 




Front of printer 



FIGURE 7 

c) Wrap and press the bottom middle pin (Figure 8, 
#1) of the interrupter, from the underside of the 
belt, into the fourth groove. 

d) Wrap and press the two upper pins (Figure 8, 
#2) of the interrupter, from the top side of belt, 
in the corresponding grooves on the belt. 

Note: Make sure the long tang (Figure 8, #3) of 
the interrupter is pointing dov^n toward the base 
plate of the printer. 




FIGURE 8 



Install Ribbon 
Lift Ball Clip 



1. Remove the right-side clip (Figure 9) by grabbing 
the upper part of the clip with needlenose pliers, 
and pulling upward. 




FIGURE 9 

2. Install the new clip by holding the top part of the 
clip with the needlenose pliers and inserting the 
clip on the bail shaft. Make sure the clip goes 
around the cutout ring on the shaft, and the long 
upper arm is positioned toward the rear of the 
printer (see Figure 10). 




FIGURE 10 



Adjustment i. 
Check 

2. 
3. 

4. 
5. 



Move the print head to the left to about the center 
of the printer. 

Now move the print head all the way back to the 
right side and observe where the interrupter stops. 

Loosen the switch assembly screw and move the 
assembly so that the long bar engages the 
interrupter and you can hear the switch click; then 
tighten the screw. 

Make sure that the switch operates (the interrupter 
arm engages the assembly arm) by moving the print 
head away from the right side of the carriage and 
then back again. The switch should click every time 
the print head reaches the right side of the carriage. 
If it does not click, then you must readjust the 
assembly until this action occurs. 

Check the left-side home position adjustment by 
referring to the Home Position Switch Adjustment 
in Section 3 of these technical procedures and 
perform the adjustment procedures. 

Note: If the home position adjustment cannot be 
preformed correctly, then you must reposition the 
interrupter on the drive belt and do both 
adjustments again. It is important that the deselect 
switch is activated whenever the print head moves 
all the way to the right-side frame and also when 
the print head returns far enough to the left side to 
be in the home position. 

Finally, use the tie wraps supplied with the home 
position switch kit to tie the two switch wires to 
the remaining wires. 



7. 



Put the cover back on the printer. (Refer to the 
Take-Apart procedures.) 



□ CUT SHEET FEEDER 



Gear when a second expansion bin is added to the Cut Sheet 

Configuration Feeder, a gear configuration plug is removed to select 

Plug that bin as bin 3. If bin 3 at some later time is to be 

used as the first expansion bin (bin 2) on another 

printer, the configuration plug must be reinstalled on it. 

This procedure refers to the bins in the following 

manner: 



• Cut Sheet Feeder is bin 1 

• The first expansion bin is bin 2 

• The second expansion bin is bin 3 



Procedure l. if the Cut Sheet Feeder (bin 1) is still attached to 

the printer, open the front cover and remove the 
feeder assembly by pulling it straight up. 

2. To separate the expansion bins from the Cut Sheet 
Feeder: 



a) Raise the tension release lever and locate the 
hole (Figure 10, #1) just below the wire paper 
guide on the Cut Sheet Feeder. Push the point 
of a screwdriver into that hole. 




FIGURE 10 



b) With your right thumb on the top of bin 2 and 
your fingers behind bin 1, press the screwdriver 
into the hole to disengage the plastic dip 
attaching bin 2 to the Cut Sheet Feeder. 

c) When the bins snap apart on the left, repeat 
steps a and b to completely separate the bins. 

3. Repeat step 2 to separate bin 3 from bin 2. 

4 Locate the drive gear (Figure 11, #1) on bin 3. 
Rotate the gear toward you until the plastic roller 
(Figure 11, #2) rotates with the gear. 




FIGURE 11 



5. Install the configuration plug as shown i 
Figure 11, #3. 



6. Rotate the gear and verify that the plastic roller 

also turns. ^ 

7. Replace the two gear box covers on the back of 
expansion bin 1 (bin 2). 

Expansion Bin To reduce paper skewing problems from bin 3 when all 

Bumper three bins are attached to the cut sheet feeder, two 

Placement rubber bumpers should be installed on the bottom of 

the expansion bins, as follows: 

1. Find the correct locations (Figure 12, #1) for the 
rubber bumpers. 

2. Make sure the locations are free from dirt and 
grease. 

3. Peel off the backing paper from the bumper pads 
one at a time. 

4. Press the bumper pads on the expansion bins in the 
exact locations as indicated in Figure 12. 

) 

Bottom View 
Bin #2 or 3 




FIGURE 12 



J 



□ VOLTAGE CONVERSION 



These procedures describe the steps required to 
convert a llOV ImageWriter LQ to a universal voltage 
model — one that supports 220V as well as llOV. The 
printer will then be switch-selectable between llOV 
and 220V. 

The conversion involves removing the present power 
supply and replacing it with a new universal power 
supply assembly. 

Materials Required ImageWriter LQ to be converted 

Universal power supply 
#2 Phillips screwdriver 

Procedure l. Remove the power supply following the procedures 

in Section 2, Take-Apart. 

2. Install the universal power supply following the 
procedures in Section 2, Take-Apart. 

3. Set the voltage selector switch to the correct input 
voltage. 



4 Apple Technical Procedures 

ImageWriter LQ 

Section 8 - Rework 



□ CONTENia 



8.2 Introduction 

8.2 Domestic Rework 

8.3 International Rework 

8.3 Materials Required 

8.4 International Installation Procedures 
8.4 Remove Covers 

8.6 Install New ROM 

8.7 Remove Card Guide 

8.8 Remove Tractor Assembly 

8.9 Remove Platen 

8.11 Remove Paper Pan Subassembly 

8.12 Install New Deflector Plates and Stop Plate 
Springs 

8.13 Install New Paper Pan Subassembly 

8.14 Install New Paper Deflector Springs 

8.15 Replace Platen 

8.17 Install New Paper Pan on Tractor Assembly 

8.18 Replace Tractor Assembly 

8.19 Install Sound-Damping Material 

8.20 Replace Covers 

8.22 Install New Platen Knob and Wire Form 
Assembly 

8.22 Install Card Guide 

8.23 Perform Card Guide Adjustment 

8.25 Install New Bottom Mylar Sheet and Label 

8.27 Perform Self-Test 

8.28 Perform Horizontal Registration Test 
8.30 Rework Symptom/Cure Chart 



□ INTRODUCTION 



The Image Writer LQ has had problems involving the 
print quality and the noise level. The rework 
procedures specifically address 

• Squashed lines at top and bottom of the page 

• Missing dots 

• Uneven shading in graphics 

• Shrill noise when printing graphics 

• Excessive case vibrations 

The print quality problems are improved by installing 

• A new wire form assembly 

• A new bottom Mylar sheet 

• A new paper pan plate on the tractor assembly 

• A new paper pan subassembly and springs 

• New deflector stop plates, springs, and set 
screws 

The noise-level problems are lessened by 

• Installing a new ROM 

• Adding sound-damping material 

• Installing a redesigned platen knob 



Domestic Rework Domestically, the ImageWriter LQ Rework is a 

complete system exchange. Printers that have serial 
numbers less than 1831011013 are eligible for the 
program. The program is appropriate for any customers 
who are experiencing the print quality and noise 
problems. 

If a customer has a reworked printer and needs a logic 
board exchange, verify that the ROM from the 
customer's logic board matches the ROM in the service 
exchange module. If the ROM is different, install the 
customer's ROM into the service exchange module 
before installing it into the reworked printer. Refer to 
"Install the New ROM" in this section for instructions. 



International Rework internationally, the ImageWriter LQ is available in a 

kit. The ImageWriter LQ International Rework 
requires the following steps: 

1. Removing rear and main covers 

2. Installing the new ROM 

3. Removing the card guide 

4. Removing the tractor feed 

5. Removing the platen 

6. Removing the paper pan assembly 

7. Installing the new deflector plates 

8. Installing the new paper pan assembly 

9. Installing the new deflector springs 

10. Replacing the platen 

11. Replacing the paper pan assembly on the tractor 

12. Replacing the tractor 

13. Installing the new sound-damping material 

14. Replacing the rear and main covers 

15. Installing the new platen knob and wire form 

16. Installing the card guide 

17. Performing the card guide adjustment 

18. Installing the new Mylar sheet and label 

19. Performing the self-test and print alignment test 



Materials Required Rework kit 

spring hook tool 

Phillips screwdriver #1 (magnetic) 
Phillips screwdriver #2 (magnetic) 
Diagonal cutters 

Jeweler's flat-blade screwdriver 
Flat-blade screwdriver #2 
Small needlenose pliers 
Macintosh Peripheral Tests diskette 
DIP switch setter 

1 sheet of 24-lb paper or special Mylar sheet for 
adjustment (included in the kit) 



□ INTERNATIONAL INSTALLATION PROCEDURES 

Remove Covers l. Remove the paper separator and the rear CQver . 

2. Remove the ribbon, if present . 

3. Remove the platen knob (Figure 1, #1) by pulling it 
to the right, away from the printer. 

4. Loosen the four captive Phillips screws 

(Figure 1, #2) holding the main cover to the printer 
base. 

5. Place your fingers under the opened front cover 
with your thumbs wrapped around the main cover. 
Lift the main cover up to disengage the catches from 
the front of the printer. 

DO NOT pull the cover away from the printer yet. 




FIGURE 1 



6. Pivot the front of the main cover up until you hear 
the catches at the rear of the cover "snap" loose 
from the base of the printer. Hold the cover in this 
position. 

7. Disconnect the following cables from the main board 
(located at the rear of the machine): 

• Control Panel PCA cable from connector CN13 
(Figure 2, #1) 

• Option Card PCA cable from connector CN15 
(Figure 2, #2) 




FIGURE 2 



Install 1. Using ESD precautions and a jeweler's flat-blade 

New ROM screwdriver, remove the ROM chip below. 



WARNING: ROM chips are susceptible to ESD damage. 
To prevent ESD damage, follow the precautions outlined 
for ESD prevention in You Oughta Know. 




FIGURE 3 



2. Position the new ROM so the notch faces the front 
of the printer and the legs are lined up with the 
socket (Figure 3, #1). Gently push the new ROM 
into the socket. 



Remove 
Card Guide 



1. Move the paper thickness lever to position 5 



2. Remove the two Phillips screws that secure the card 
guide to its two mounting posts (Figure 4, #1). 




ImageWriter LQ 



Mar 89 



Rework / 8.7 



Remove 

Tractor Assembly 



1. Locate and push back the blue tractor levers, both 
right and left (Figure 5, #1), to release the tractor 
assembly. 




FIGURES 

2. Remove the tractor levers by placing your thumb on 
the metal cylinder and your forefinger on the 
tractor lever and pushing the lever toward the 
center of the printer. Removing the levers will 
require a bit of pressure, but don't worry; you won't 
break the lever. 

3. Remove the tractor by first pressing it toward the 
rear of the printer and then lifting up and out. 



8.8 / Rework 



Mar 89 



ImageWriter LQ 



Remove l. Move the carrier assembly to the center of the 

Platen printer. 

2. Open the paper bail by lifting it away from the 
platen. 

3. Disconnect the left and right springs (Figure 6, #1) 
between the gap adjustment cams and the paper 
guide plate. Leave the spring attached to the lever 
assembly. 

4. Using the needlenose pliers or the jeweler's 
flat-blade screwdriver, remove the E-rings 
(Figure 6, #2) on the left and right gap adjustment 
cams. 



mm 



3 





FIGURE 6 



5. Move the left and right gap adjustment cams 
(Figure 6, #3) inward, toward the platen. 



ImageWriter LQ 



Mar 89 



Rework / 8.9 



6. 



Using the flat-blade screwdriver, move the platen 
catches (Figure 7, #1) inward, toward the platen. 




FIGURE? 



7. Lift the platen up on the right side until it clears 
the cut sheet feeder lever and printer frame 
(Figure 8). 

8. Lift out the left side until it clears the gear 
assembly (Figure 8). Set the platen aside. 




FIGURE 8 



8.10/ Rework 



Mar 89 



ImageWriter LQ 



Remove 
Paper Pan 
Subassembly 



Locate the two springs on the paper pan 
subassembly (Figure 9, #1). 




FIGURES 



2. Using the spring hook, unhook the left and right 
springs (Figure 9, #2), and lift the paper pan 
subassembly and the springs from the machine. This 
subassembly will be completely replaced. 



ImageWriter LQ 



Mar 89 



Rework/ 8.11 



1. Locate and remove the Phillips screws that hold 
deflector stop plates (Figure 10, #1) on both the 
right and left sides of the paper guide plate. 
Discard the old screws and stop plates. 

2. Attach one end of the new spring to the new left 
deflector plate (Figure 10, #2). 



WARNING: When positioning tlie stop plate on to thie 
mechanism, DO NOT TIGHTEN THE SCREW. There 
should be some play in the plate. 

3. Position the new left deflector plate, and screw in 
the set screw (Figure 10, #3). Do not tighten the 
screw. 



4. Connect the other end of the spring to the round 
hole in the paper guide plate (Figure 10, #4). 




FIGURE 10 



5. Repeat steps 1 through 4 for the right side. 
8.12/ Rework Mar 89 ImageWriter LQ 



Install New 
Deflector Plates 
and Stop Plate 
Springs 



install New 
Paper Pan 
Subassembly 



1, 



Connect the new paper cradle springs, one to each 
end of the new paper pan subassembly 
(Figure 11, #1). 




2. Install the new paper pan subassembly into the 
machine. Attach the springs to the small extension 
on the paper guide plate (Figure 11, #2). 



ImageWriter LQ 



Mar 89 



Rework/ 8.13 



Install New 
Paper Deflector 
Springs 



1. 



Locate the four paper deflector springs 

(Figure 12, #1). Remove them using needlenose 

pliers or cut them out. 




FIGURE 12 



Note: The hook on the spring that connects to the 
paper deflector (Figure 12, #2) needs to face 
upward. The hook on the spring that connects to the 
mechanism needs to face down (Figure 12, #3). 

2. Using needlenose pliers, install the four new paper 
pan springs by attaching one end to the paper 
deflector (Figure 12, #2) and the other to the 
mechanism (Figure 12, #3). 



8.14/ Rework 



Mar 89 



ImageWriter LQ 



Replace Platen 



1. Place the platen assembly in the mechanical 
assembly (Figure 13). 




ImageWriter LQ 



Mar 89 



Rework/ 8.15 



2. Move the left and right platen catches (Figure 14, 
#1) outward until they engage fully with the platen 
holder. 




FIGURE 14 

3. Snap the left and right gap adjustment cam E-rings 
into place (Figure 15, #2). Make sure the metal 
washer is behind the E-ring. 

4. Attach the left and right springs (Figure 15, #1) 
between the gap adjustment cams and the paper 
guide plate. 




FIGURE 15 



8.16/ Rework 



Mar 89 



ImageWriter LQ 



Install New 
Paper Pan on 
Tractor Assembly 



1. Remove the screws (Figure 16, #1), right and left, 
that hold the paper pan to the tractor assembly. 




FIGURE 16 

2. Position the new paper pan so that the lip 

(Figure l6, #2) is on the end of the tractor assembly 
that has a gear. 

3. Replace the screws, right and left, into the center 
hole on the tractor unit. The screws hold the paper 
pan in place. 



ImageWrrter LQ 



Mar 89 



Rework/ 8.17 



Replace l. Align the four posts on either side of the tractor 

Tractor assembly with the slots in the mechanical assembly 

Assembly (Figure 17), and lower the tractor assembly into 

position. 




FIGURE 17 

2. Snap the left and right blue tractor levers into 
place. 



8.18/ Rework 



Mar 89 



ImageWriterLQ 



Install 

Sound-Damping 
Material 



1. Remove the plastic protector (Figure 18, #1) from 
the print head relay cable. 

2. Wipe clean the area under the print head relay cable 
to ensure that it is free of dirt and oil. 

3. Remove the backing, and position the damping 
material (Figure 18, #2) in the center of the flat 
area on the carriage assembly. Press down firmly. 




FIGURE 18 



4. Replace the plastic protector (Figure 18, #1). 



ImageWriter LQ 



Mar 89 



Rework/ 8.19 



Replace Covers 



1. 



Position the main cover so that it is standing up 
behind the printer. 



2. Tilt the main cover forward slightly, and connect the 
two cables from the main cover to the main board: 

• Control Panel PCA cable to connector CN13 
(Figure 19, #1) 

• Option Card PCA cable to connector CN15 
(Figure 19, #2) 




FIGURE 19 



8.20 / Rework 



Mar 89 



ImageWriter LQ 



Hold the main cover by its sides. Lower the cover 
onto the base of the printer, back first. 

As you lower the cover, watch the following: 

a) The paper-feed arm (Figure 20, #1) should be 
engaged in the paper-feed lever (Figure 20, #2). 




FIGURE 20 



b) The plastic divider in the option card 

compartment should be in front of the power 
supply heat sink (Figure 21, #1). 




FIGURE 21 



Mar 89 



Rework / 8.21 



4. 



Partially screw in the four captive Phillips screws 
that secure the main cover to the bottom cover. 
Then tighten the screws. 



Install New 
Platen Knob and 
Wire Form Assembly 



1. Install the new platen knob on the right side of the 
printer. 

2. Replace the rear cover. 

3. Install the new wire form assembly inside the rear 
cover. 



Install 

Card Guide 



1. Slide the card guide over its two mounting posts. 

2. Install, but don*t tighten, the two Phillips screws 
that secure the card guide to the mounting posts. 



8.22 / Rework 



Mar 89 



I mage Writer LQ 



Perform 
Card Guide 
Adjustment 



1. Push the paper thickness lever (Figure 22, #1) 
toward the back of the printer, to the number-one 
position. 



2. Be sure the power is off. 

3. Move the carrier assembly (Figure 22, #2) to the 
center of the printer. 

4. Loosen the two set screws that hold the card guide 
(Figure 22, #3). 




FIGURE 22 



ImageWriter LQ 



Mar 89 



Rework / 8.23 



5. Roll the 24-lb sheet of paper or the Mylar 
adjustment sheet between the card guide and the 
platen (Figure 23, #1). 

6. Gently push forward on the card guide until it stops 
against the paper (Figure 23, #2). 

7. While holding the card guide in position, tighten 
the two set screws (Figure 23, #3) that hold it in 
position. 




FIGURE 23 



8.24 / Rework 



Mar 89 



ImageWriter LQ 



Install New l. Gently place the printer top-down on foam padding. 

Bottom Mylar 

Sheet and Label 2. Position the Mylar so the notch fits securely around 

the rubber foot. The Mylar has to fold over into the 
slot for the paper feed (Figure 24, #1). 




FIGURE 24 



3. Smooth the Mylar onto the case and into the slot 
(Figure 24, #2) for the bottom paper feed. 



ImageWriter LQ Mar 89 Rework / 8.25 



4. Position the rework label on the right side (Figure 
25, #1) of the front cover. 




FIGURE 25 

5. Replace the ribbon cassette. 



8.26 / Rework 



Mar 89 



ImageWriter LQ 



Perform Self-Test 



1. 



Install paper into the printer . 



2. Press down the form feed and hold it down while 
turning on the printer. Release the form feed. The 
printer should print the ROM revision, DIP switch 
settings, and a continuous form of characters. 

If the printer does not print, turn to the Rework 
Symptom/Cure Chart at the end of this section. 

3. Turn the power switch off to terminate the test. 



) 



J 

ImageWriter LQ 



Mar 89 



Rework / 8.27 



Perform The horizontal registration test is done to ensure the 

Horizontal proper placing of the characters horizontally and 

RegiStrationTest vertically on the printout of any page. Uneven print 

alignment can be corrected by selecting the appropriate 

DIP switches. 

1. Perform the Horizontal Registration Test on the 
Macintosh Peripheral Tests diskette. Refer to 
Section 5, Diagnostics, for complete information. 

2. Be sure the power is off. 

3. Check the printout, and select the best horizontal 
registration. 

4. Using Tables 1 and 2, and Figure 26, set DIP 
switches 3-6, 3-7, and 3-8 according to the best 
registration selected on the printout. (1 = On; = 
Off.) 

5. Repeat steps 1 through 4 until the correct DIP 
switches are set for the best horizontal registration . 

TABLE 1 



DIPSw 
3-6 


DIPSw 
3-7 


DIP Sw 
3-8 


Amount of left 
movement (mm) 


ON 


ON 


OFF 


+ 0.159 


OFF 


ON 


OFF 


+ 0.106 


ON 


OFF 


OFF 


+ 0.053 


OFF 


OFF 


OFF 


(100 



8.28 / Rework 



Mar 89 



Im^eWriter LQ 



TABLE 2 



DIP Sw 
3-6 


DIP Sw 

1 i www 

3-7 


DIP Sw 
3-8 


Amount of rioht 
movement (mm) 


OFF 


OFF 


ON 


- 0.044 


ON 


OFF 


ON 


- 0.088 


OFF 


ON 


ON 


-0.132 


ON 


ON 


ON 


- 0.176 



i 1 * 



i 1 



FIGURE 26 



ImageWriter LQ 



Mar 89 



Rework / 8.29 



□ REWORK SYMPTOM/CURE CHART 



For additional troubleshooting information refer to 
Section 4, Troubleshooting. 



Symptom 



Cure 



Powers on, but no 
carrier movement 



- Verify that the new ROM is inserted with the 
notch toward the front of the printer. 



Print density 
gets lighter or darl<er 
from one end of the 
line to the other 



1. Perform the "Print Head Gap Adjustment." 
(Refer to Section 3, Adjustments.) 

2. Perform the "Platen Gap and Parallelism 
Adjustment." (Refer to Section 3, Adjustments.) 



Powers on, but no 
carrier movement 



- Verify that the new ROM is inserted with the 
notch toward the front of the printer case. 



8.30 / Rework 



Mar 89 



ImageWriter LQ 



€ Apple Technical Procedures 

ImageWriter LQ 

Illustrated Parts List 



□ CONTENTS 

IPL.2 Miscellaneous Hardware Kit 

IPL.3 Rework Kit— Revised 

IPL.5 Assembly Location (Figure 1) 

IPL.7 Top Cover Assembly (Figure 2) 

IPL.9 Tractor Feed Assembly (Figure 3) 

IPL.ll Platen Assembly (Figure 4) 

IPL.13 Print Head/Carriage Assembly (Figure 5) 

IPL.15 Main Frame Assembly (Figure 6) 

IPL.17 Left Side Frame Assembly (Figure 7) 

IPL.19 Right Side Frame Assembly (Figure 8) 

IPL.21 Power Supply and Main PCB Assembly (Figure 9) 

IPL.23 Main Board Fuses (Figure 10) 

IPL.25 Cables (Figure 11) 

IPL.27 Paper Pan Subassembly (Figure 12) 

IPL.29 Wire Form Assembly (Figure 13) 

IPL.31 Tool (Figure 14) 

The figures and lists above include all piece parts that 
can be purchased separately from Apple for the 
ImageWriter LQ, along with their part numbers. Refer to 
the Apple Service Programs manual price pages for part 
number availability in your area. 



ImageWriter LQ 



rev. Jul 89 



Illustrated Parts List / 1 PL 1 



□ MISCELLANEOUS HARDWARE KIT 



Part No. Description 

O76-O262 Miscellaneous Hardware Kit 



Parts listed below are included in the ImageWriter LQ 
Miscellaneous Hardware Kit. The quantities listed are 
included in the kit. 

Parts listed with a part number are available separately. If 
ordering these parts separately, see the Apple Service 
Programs manual for quantities and prices. Parts listed without a 
part number are not sold separately. 



Part No, Description See Figure # 

- Friction Release Lever (2/pk) 2 
956-0016 Platen Knob (without ribs) 2 
952-0012 Case Top Magnet (2/pk) 2 

Spacer, Tractor Idler Shaft (2/pk) 3 

Timing Belt Retainer (2/pk) 5 

Rubber Grommet (2/pk) 6 & 7 

Gap Lever Cap (2/pk) 7 

Tractor Lever Lock, LH (2/pk) 7 

Tractor Lever Lock, RH (2/pk) 8 

076-0273 Rubber Foot (2/pk) 9 

- Screw, Sems w/Flat Washer, Various 

2.6 X 6mm (4/pk) 

- Screw, Flanged, 3 x 4mm (2/pk) Various 

- Screw, Sems w/Flat Washer, Various 

3 X 12mm (2/pk) 

- Screw, Shoulder, 4 x 15mm (2/pk) Various 
076-0325 Screw, Double Sems 4x8 (4/pk) Various 
076-0292 Screw, Double Sems 3 x 10 (6/pk) Various 
076-0293 Screw, Double Sems 3x6 (4/pk) Various 



IPL2 / Illustrated Parts List 



rev. Apr 89 



ImageWriter LQ 



□ REWORK KIT— REVISED 
Part No. Description 

652-0600 Rework Kit— Revised* 

*Note: The Revised Rework Kit, as a kit, is available only to 
Apple International at this time. Some parts included in the 
Rework kit are available in the U.S. by ordering them separately 
by part number. Some parts without part numbers are 
available in the U.S. as part of the Paper Pan Subassembly. See 
the Apple Service Programs manual for quantities and prices. 



Part No. 


Description 


See Fiaure # 




Paper Pan (A)^ 


12 




Paper Pan Mylar-'^ 


12 




Platen Cradle Mylar-^ 


6, 12 




Paper Table^ 


12 


- 


Wire Form^ 


13 






1 ^ 


- 


Masked ROM, IC^ 






Disk HvnerCard Stack & Drive^ 




076-0344 


Paper Deflector Spring, (4/pk) 


6 


076-0345 


Deflector Stop Plate, Left 


6 


076-0346 


Deflector Stop Plate, Right 


6 


076-0347 


Tool, Spring Remover/Install 


14 


931-0026 


Set Screws, (2/pk) 


6 


948-0042 


Paper Pan Subassembly 


12 


948-0043 


Wire Form Assembly 


13 


948-0046 


Paper Pan (B) 


3 


949-0242 


Sound-Damping Material 


5 


956-0016 


Platen Knob w/o Ribs 


2 


957-0054 


Platen Cradle Spring, (2/pk) 


6 


957-0055 


Paper Pan Spring, (2/pk) 


6, 12 


958-0013 


Mylar, Bottom 


1 


958-0015 


E-Ring, E-4, (2/pk) 


7 


958-0016 


E-Ring, E-6, (2/pk) 


4 


958-0017 


Mylar, Paper Guide Adjustment 






1. Included in Paper Pan Subassembly 






2. Available only in Revised Rework 


Kit 



ImageWriter LQ 



rev. Mar 91 



Illustrated Parts List/IPL.3 




IPL4/ Illustrated Parts List 



rev. Apr 89 



ImageWriter LQ 



□ ASSEMBLY LOCATION (Figure 1) 



Item Part No. Description 

1 Top Cover Assembly 

2 - Tractor Feed Assembly 

3 - Platen Assembly 

4 - Main Frame Assembly 

5 - Left Side Frame Assembly 

6 - Right side Frame Assembly 

7 — Main PCB Assembly 

8 — Power Supply and Main PCB Assembly 

9 958-0013 Bottom Mylar* 

10 - Print Head/Carriage Assembly 



*Included in Rework Kit. Also sold separately. 



ImageWriter LQ 



rev. Apr 89 



Illustrated Parts List/IPL5 




IPL6/ Illustrated Parts List 



rev. Jul 88 



ImageWriter LQ 



□ TOP COVER ASSEMBLY (Figure 2) 



Item 


Part No. 


DescriDtion 


1 


949-0140 


Main Cover 


2 


590-0602 






076-0262 


Apppco f^nifpr ^prp'w mi hip Sptti** 4 y Rititti Tin/riW^* 


4 


952-0012 


Case Top Magnet (10/pk)** 


5 


949-0138 


Top Cover 


6 


949-0137 


Front Cover 


7 


076-0262 


Friction Release Lever (in Misc. Hardware Kit) 


8 


956-0016 


Platen Knob w/o Ribs*** 


9 


590-0601 


Control Panel Cable 


10 


949-0141 


Control Panel PCA 



*Also included in the Miscellaneous Hardware Kit 
(4 in kit). 



**Also included in item 6 and in the Miscellaneous 
Hardware Kit (2 in kit). 

***Also included in item 1 and in the Miscellaneous 
Hardware Kit and in the Rework Kit. 



ImageWriter LQ 



rev. Apr 89 



Illustrated Parts List/IPL7 



□ TRACTOR FEED ASSEMBLY (Figure 3) 



Hem 


Part No. 


Description 


1 


939-0015 


Tractor Drive Gear 


2 


076-0262 


Spacer, Tractor Idler Shaft (in Misc. Hardware Kit) 


3 


076-0257 


Left Tractor Assembly 


4 


076-0256 


Right Tractor Assembly 


5 


948-0045 


Complete Tractor Assembly (includes all above parts) 



ImageWriter LQ 



rev. Jul 90 



Illustrated Parts List/IPL.9 




IPL10/ Illustrated Parts List 



rev. Apr 89 



ImageWriter LQ 



□ PLATEN ASSEMBLY (Figure 4) 



ItGni 


Part No. 


Description 


1 


939-0018 


Platen Drive Gear (3/pk) 


2 


959-0025 


Platen Sleeve Bearing (6/pk) 


3 


076-0255 


Complete Platen Assembly 


4 


957-0035 


Spring, Feed Roller Cam (6/pk) 


5 


949-0169 


Lever, Feed Roller Cam (6/pk) 


6 


958-0016 


E-Ring, E-6 (2/pk)* 



*Included in Rework Kit 



ImageWriter LQ 



rev. Apr 89 



Illustrated Parts List / IPL11 




IPL1 2 /Illustrated Parts List 



rev. Mar 91 



ImageWriterLQ 



□ PRINT HEAD/CARRIAGE ASSEMBLY (Figure 5) 



ItGm 


P^rt Nn 




1 
I 


U / D-UDUo 




z 


con n/^o^ 


v^aDies, riinL iieau to i\cia.y r^v>ij 


t> 




iiTid.gcw riLcr i-<\;/ JriiriL jncd.ci 


4 


C\/i O MO 1 "7 










6 


949-0170 


Ribbon Support Guide (3/pk) 


7 


076-0262 


Timing Belt Retainer (2/pk) 


8 


959-0026 


Carrier Frame Bearing (3/pk) 


9 


959-0020 


Carrier Felt Set (6/pk) 


10 


076-0307 


Front Carrier Assembly 


11 


937-0030 


Home Position Switch 


12 


949-0242 


Sound-Damping Material* 



*Induded in Rework Kit. Also sold separately. 



ImageWriter LQ 



rev. Mar 91 



Illustrated Parts Ust/IPL13 




IPL.14/ Illustrated Parts List 



rev. Apr 90 



I mage Writer LQ 



□ MAIN FRAME ASSEMBLY (Figure 6) 



It0fn 


Part No. 


DescriDtlon 


1 


949-0172 


Lever, Paper Bail Adjustment, Right (3/pk) 


2 


949-0171 


Paper Bail Lever (6/pk) 


3 


076-0346 


Deflector Stop Plate, Right* 


4 


959-0027 


Pin Assembly, Ribbon Box Drive (5/pk) 


5 


959-0024 


Carrier Belt Pulley (3/pk) 


6 


939-0016 


Ribbon Drive Gear 


7 


939-0019 


Ribbon Drive Idler Gear (3/pk) 


8 


9^7-00^0 


Home Position Switch Kit 


9 


959-0016 


Carrier Drive Motor 


10 


O76-O262 


shoulder Screw, 4 x 15 mm, and Rubber Grommet 






(in Misc. Hardware Kit) 


11 


076-0344 


Paper Deflector Spring (4/pk)* 


12 


957-0055 


Paper Pan Spring (2/pk)* 


13 


948-0032 


Paper-Out Sensor 


14 


957-0054 


Platen Cradle Spring (2/pk)* 


15 


076-0345 


Deflector Stop Plate, Left* 


16 


931-0026 


Set Screw (2/pk)* 


17 


937-0033 


Paper Detect Switch 


18 


949-0174 


Lever, Paper Bail Adjustment, Left (3/pk) 


19 


076-0261 


Pinch Roller Assembly 


20 


949-0173 


Lever, Paper-Out Detect (3/pk) 


21 


076-8375 


Paper Deflector with Springs 



*Included in Rework Kit. Items are also available 
separately. 



Note: This item is available as part of the Rework Kit 
or the Paper Pan Subassembly. 

A Platen Cradle Mylar 



ImageWriter LQ 



rev. Mar 91 



Illustrated Parts List/IPL15 




IPL.16/ Illustrated Parts List 



rev. Apr 90 



I mage Writer LQ 



□ LEFT SIDE FRAME ASSEMBLY (Figure 7) 



liem 


Dort Kin 


LA;9uripuoii 


1 




Motor Assembly, Color Ribbon 


Z 


O/lQ ni7^ 


Lcvci, rd-per ijaii Arm, Licil v^D/pi^y' 






C^f^ctf T it^l^o<T*a A cc^^m r\l ■\7' 
VjCd.1 Lt\l\\\.<x^yZ /\ooClIlUiy 


4 


o^o r\r\ 1 "7 
y!>y-UUi / 


Paper Feed Motor 


> 




L>UL oneei reeuer L>/rive oear vD/pi^y 


u 


U / U v/^U^ 


IjvJV^iV, ll<a.\^L\Jl l-<CVd J IjCI L v^i^ iVlloV-*. 1 l<a.l vj. W dl C rvlLy 


7 


07(^-0949 


vJa.|J i-.CVCl v><ip IVlloC llill LIW til C XvlL_^ 


8 


956-0008 


Cassette Latch Set 


9 


949-0176 


Lever, Ribbon Lift Shaft (6/pk) 


10 


959-0028 


Bearing, Carrier Shaft, Right (3/pk) 


11 


076-0262 


Shoulder Screw, 4 x 15 mm, and Rubber Grommet 






(in Misc. Hardware Kit) 


12 


958-0015 


E-Ring, E-4 (2/pk)* 


13 


939-0020 


Idler Gear (3/pk) 



*Included in Rework Kit 



ImageWriter LQ 



rev. Apr 90 



Illustrated Parts List/IPL.17 




IPL.18 / Illustrated Parts List 



rev. Jul 88 



ImageWriter LQ 



□ RIGHT SIDE FRAME ASSEMBLY (Figure 8) 



Item 


Part No. 


Description 


1 


984-0003 


Paper Bail Roller (6/pk) 


2 


949-0180 


Bracket, Paper Bail/Platen (3/pk) 


3 


937-0034 


Switch, Cut Sheet Feeder 


4 


949-0179 


Lever, Paper Bail Arm, Right (3/pk) 


5 


935-0006 


Auto Load Solenoid Assembly 


6 


949-0178 


Link, Paper Bail/Solenoid (3/pk) 


7 


937-0035 


Paper Bail Solenoid 


8 


939-0022 


Gear, Ribbon Lift Cam (3/pk) 


9 


939-0021 


Gear, Ribbon Lift Shift (3/pk) 


10 


959-0030 


Cam Gear Collar (6/pk) 


11 


956-0008 


Cassette Latch Set 


12 


959-0029 


Bearing, Carrier Shaft, Right (3/pk) 


13 


949-0177 


Lever, Cut Sheet Feeder Detect (3/pk) 


14 


076-0262 


Lever, Tractor Lock, Right (in Misc. Hardware Kit) 


15 


949-0176 


Lever, Ribbon Lift Shaft (6/pk) 



ImageWriter LQ 



rev. Jul 88 



Illustrated Parts List/IPL19 



IPL20 / lllustmted Parts List rev. Aug 89 Im^eWriter LQ 



□ POWER SUPPLY AND MAIN PCB ASSEMBLY (Figure 9) 



ItGm 


Part No. 


DescriDtion 


1 


661-0563 


Main Board with Revised ROM 


2 


915-0030 


Transformer 110 V 


3 


96I-OOO6 


Noise Filter Assembly, 100/240 V 


4 


941-0010 


Fuse 3 AMP 


5 


937-0032 


Power Switch 


6 


915-0031 


Transformer/Voltage Select Switch, 100/240 V 


7 


949-0139 


Bottom Cover 


8 


076-0262 


Rubber Foot (10/pk)* 


9 


590-0396 


Flexible Relay Cables 


10 


915-0042 


Transformer/Volt Switch Assembly, 1 00/240 V 






(conversion) 



*Included in the Miscellaneous Hardware Kit (2 in kit). 



ImageWriter LQ 



rev. Mar 91 



Illustrated Parts List / IPL.21 




IPL.22 / Illustrated Parts Ust 



rev. Jun 89 



ImageWriter LQ 



□ MAIN BOARD FUSES (Figure 10) 



Item 


Part No. 


Description 


1 


661-0563 


Main Board with Revised ROM 


2 


941-0012 


Fuse, 1.5 Amp (Located on board at FU3) 


3 


941-0010 


Fuse, 3 Amp (Located on board at FU2) 


4 


941-0014 


Fuse, 8 Amp (Located on board at FUl) 



ImageWriter LQ 



rev. Aug 89 



Illustrated Parts List / IPL.23 



am 



3C 





HI 



3: 



3C 



FIGURE 11 





1 



) 



IPL.24 / Illustrated Parts List 



rev. Jul 88 



ImageWriterLQ 



□ CABLES (Figure 11) 



Item 


Part No. 


Description 


1 


590-0380 


Cable, AC Power (Smoke) 


2 


590-0551 


Cable, APM/ImageWriter II/LQ to Macintosh (Smoke) 


3 


590-0554 


Cable, APM/ImageWriter II/LQ to Apple lie (Smoke) 


4 


590-0556 


Cable, ImageWriter II/LQ to Apple II, II Plus, He 






(Smoke) 


5 


590-0552 


Cable, APM/ImageWriter II/LQ to Apple IIGS, 






Macintosh Plus/SE/II (Smoke) 


6 


590-0555 


Cable, APM/ImageWriter II/LQ to Apple II/II Plus, 



Apple III/III Plus, Macintosh XL (Smoke) 



ImageWriter LQ rev. Jul 88 Illustrated Parts List / IPL.25 




IPL26/ Illustrated Parts List 



rev. Jun 89 



ImageWriter LQ 



□ PAPER PAN SUBASSEMBLY (Figure 12) 



Item Part No. Description 

1 948-0042 Paper Pan Subassembly 

2 957-0055 Paper Pan Spring (2/pk) 

Note: The following items are available as part of the 
Paper Pan Subassembly and are not available 
separately. The Paper Pan Subassembly is available 
separately or as part of the Rework Kit. 

A Mylar, Platen Cradle 

B Paper Table 

C Mylar, Paper Pan 

D Paper Pan (A) 



ImageWriter LQ 



rev. Mar 91 



Illustrated Parts List / IPL.27 




IPL.28 / Illustrated Parts List 



rev. Apr 90 



ImageWriter LQ 



□ WIRE FORM ASSEMBLY (Figure 13) 



jtsm 



P9rtNo, 



Description 



1 



948-0043 



Wire Form Assembly 



Note: Some of the other parts shown in this diagram 
are available as part of the Wire Form Assembly in the 
Rework Kit. Refer to the Rework Kit for further 
information. These parts are not available separately. 

A Wire Form 

B Paper Separator 



ImageWriter LQ 



Apr 89 



Illustrated Parts List / IPL29 




V 

FIGURE 14 



IPL30/ Illustrated Parts List Apr 89 ImageWriterLQ 



□ TOOL (Figure 14) 

Hem Part No. Description 

1 076-0347 Tool, Spring Remover/Install* 

"Included in the Rework Kit. Also sold separately. 



ImageWriter LQ 



Apr 89 



Illustrated Parts List / IPL.31 



# Apple Technical Procedures 

ImageWriter LQ 

SheetFeeder Illustrated Parts List 



□ CONTENTS 



SF-IPL.3 Cut SheetFeeder (Figure 1) 

SF-IPL.3 Forward Collator Assembly (Figure 2) 

SF-IPL.5 Single Bin (Figure 3) 

SF-IPL.5 Extension (Figure 4) 

SF-IPL.7 Envelope Hopper (Figure 5) 



The figures and lists above include all piece parts that can 
be purchased separately from Apple for the ImageWriter 
LQ, along with their part numbers. These are the only 
parts available from Apple. Refer to your Apple Service 
Programs manual for prices. 



ImageWriter LQ 



Nov 87 



Illustrated Parts List / SF-IPL.1 



□ CUT SHEETFEEDER (Figure 1) 



Item 


Part No. 


Description 


1 


949-0188 


Paper Holder 


2 


949-0189 


Rear Cover 


3 


949-0191 


Separation Finger Kit 


4 


949-0190 


Rear Panel Kit 


5 


948-0033 


Paper Guide Plate 



□ FORWARD COLLATOR ASSEMBLY (Figure 2) 
Item Part No. Description 

949-0194 Forward Collator Assembly 

1 949-0192 Forward Collator Paper Deflector 

2 949-0193 Forward Collator Support Output 



ImageWriter LQ 



Nov 87 



Illustrated Parts List / SF-IPL.3 



FIGURES 




IPL.4/ Illustrated Parts List 



rev. Dec 88 



ImageWriter LQ 



□ SINGLE BIN (Figure 3) 

Item Part No. Description 

661-0446 Single Bin 

1 956-0014 Rubber Peel (4/pk) 



□ EXTENSION (Figure 4) 

Item Part No. Description 

- 661-0447 Extension 



ImageWriter LQ rev. Dec 88 Illustrated Parts List / SF-IPL.5 



FIGURE 5 




NOT GLUED 

FIGURE 6 



SF-IPL.6 / Illustrated Parts List 



rev. Feb 88 



image Writer LQ 



□ ENVELOPE HOPPER (Figure 5) 
Item Part No. Description 

— 949-0195 Envelope Hopper 



□ SINGLE BIN - SIDE VIEW (Figure 6) 
Item Part No. Description 

1 956-0013 Rubber Stoppers 



ImageWriter LQ rev. Feb 88 Illustrated Parts List / SF-IPL.7