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System 700 


СТ-700$ 


Service Manual 


Specifications 


Contents 


Instruction Information 


Features 
Installation 
Tuner Connections 

Tuner Power Supply 
Control Functions 

Tuner Operation 
Trouble Shooting Guide 


Circuit Description 


PLL Frequency Synthesizer 
FM Front End & IF 
MPX Stereo Demodulation 
Signal Meter 
Scan Stop Operation 
Muting Operation 
AM Tuner Circuit 


Service Information 


Measurement Condition 
Test Equipment 
Operation & Standard Setting 
FM Alignment 
AM Alignment 
Block Diagram 
PC Board Layout 
Exploded View 
Replacement Parts List 
Schematic Diagram 


Specifications 


Power consumption. 
Power supply. 
Dimensions. 

Width 

Height 

Depth 


FM 

Frequency range. 
Sensitivity. 

50 dB quieting sensitivity. 
Mono 

Stereo 


Total harmonic distortion. 


Mono 

Stereo 

S/N. 

Mono 

Stereo 

Frequency response. 


Alternate channel selectivity. 


Capture ratio. | 
Image rejection ratio. 
IF rejection. 


Spurious response rejection. 


AM suppression. 
Separation. 
1kHz 

10 kHz 


20 Watt. Carrier leak (19 kHz). 


220V 50 Hz AC. Output voltage. 


AM 

Frequency range. 
Sensitivity. 
Selectivity. 
Image rejection. 
87.5 to 108.0 MHz. S/N. 

10.3 dBf (1.8 microvolt ІНЕ '58). Output voltage. 


420 mm. 
48 mm. 
430 mm. 


16.6 dBf (3.7 microvolt ІНЕ 58), 
37.2 dBf (39.2 microvolt IHF 58). 


0.1% 1 kHz. 
0.2% 1 kHz. 


75 dB. 

70 dB. 

30 to 15,000 Hz +0, —0.5 dB. 
80 dB. 

1.2 dB. 

70 dB. 

90 dB at 98 MHz. 

85 dB at 98 MHz. 

55 dB. 


50 dB. 
39 dB. 


65 dB. 
715 ту. 


531 to 1,602 kHz. 
300 microvolt/m. 
45 dB. 

50 dB at 1 kHz. 
50 dB. 

300 mV. 


Instruction Information 


Features 


The Cybernet model СТ-700$ is a high fidelity stereo tuner 
designed to be incorporated with other System 700-series 
components — the integrated stereo amplifier model CA-700 
and the stereo cassette deck model CCD-700 — into a complete 
stereo system. It features the following: 


Fluorescent digital AM/FM frequency display/Automatic and 
manual tuning with digital PLL synthesizer/Memory pushbutton 
tuning for 7 AM and 7 FM stations/Short-time-hold [STH] 
feature for temporary station tuning/Switchable indicator array 
for signal strength or multipath interference indication/ 
Multiplex filter for reduction of residual multiplex pilot noise/ 
Sensitive dual gate MOSFET in the FM front end/High 
selectivity IF stage with 3 dual-element ceramic filters/ 
Phase-locked-loop [PLL] multiplex stage for stable stereo 
demodulation/IIluminated pushbuttons. 


Tuner Connections 


Installation 


Installation of your new tuner is not complicated. However, 
the following guidances must be followed for satisfactory 
performance and easy operation of the system. 


Do not remove the cover — there are no user serviceable parts 
inside the unit. Refer servicing only to the qualified 
personnel/The unit must not be exposed to excessive dust, 
moisture, or direct sources of heat and sunlight/To clean the 
cover, wipe with soft cloth soaked in a neutral cleaner or a 
polishing cloth. Do not use benzine or thinner which will 
damage the cover finish. 


AM Loopstick Antenna 





Antenna Terminal 
(See below) 


ЕМ 75 Ohm У 
Antenna 


FM 300 Ohm 
Antenna 


75 Ohm 
Coaxial Cable 





ан = 
{ЕЧ ЖАА 
1 Remove 30 mm of outer insulation 
2 Remove all but 20 mm of the shield 


braid 3 Remove innerinsulation leaving 
10 mm of the insulation exposed. 





Power Plug 
220V 50 Hz 


Tuner Output: 

Use shielded audio cables. 
Connect to amplifier 
Tuner input terminals. 


Clamp and 
secure 


AM 
Longwire 








300 Ohm Twin-Lead Cable 


пене чне И 


Remove 20 тт of insulation and 
30 mm of bridge. Strand exposed 
conductors. 


AM Antennas 

Select use of attached loopstick or additional long-wire 
antenna for AM reception. 

Ferrite loopstick antenna. The ferrite loopstick antenna is а 
sensitive pickup element of the AM tuner sections. For 
maximum station reception, it must be properly positioned 
away from the rear chassis and other metallic surfaces. The 
associated connecting cables and AC power cord should be 
dressed as far away as possible. For optimum performance, 
the antenna should be positioned for maximum signal 
strength indicator indication when the unit is tuned to the 
desired AM station. ” 

External AM antenna. AM antenna terminals аге provided for 
a properly designed long wire AM antenna system. Such 
antennas are useful when the desired AM stations are at a 
considerable distance from the tuner. A simple long wire 
antenna can consist of a length of single conductor, insulated 
wire of 30 feet (9 meters) or longer, extending from the 
tuner external AM antenna terminal to the outside 

of the building. This wire should be positioned away from 
electrical cables and appliances. Аза rule, the longer and 
higher the antenna, the better the reception. However, as 
signal pick up of broadcast station is increased, so also is the 
pickup of undesirable man-made interference. Therefore, 
the external AM antenna should be evaluated on a 
trial-and-error basis. 

FM Antennas > 

Select dipole supplied or connect suitable external antenna 
system. 

Supplied 300 Ohm FM Antenna. An FM dipole antenna is 
supplied with your tuner. In strong signal area, this should be 


antenna. The braided outer conductor is connected to 
ground clamp. Refer to connection diagram for 

proper cable preparation and hook-up. This type of lead-in 
offers the same advantages as shielded 300 Ohm cable by 
minimizing interference picked up by the lead-in cable. 


Grounding. Under certain conditions a good earth ground will 
improve performance of the tuner by reducing interference 
conducted via the power line. A good ground may also improve 
the AM performance. Good earth ground dictates that the 
ground wire be as short as possible, connected to a specifically 
designed, copper clad steel rod driven into moist earth, or to 
the cold water supply pipe as it enters the building. Clean 
oxide from rod or pipe and use suitable ground clamp. 


Tuner Output. Use insulated and shielded audio cables 
terminated with standard pin [cinch] plug. Connect to the 
input jack on your amplifier or receiver. Observe proper 
channel connection. 


more than adequate for reception of most FM stations. 
Antenna connections are made to the terminal strip marked 
FM-300 Ohm located on the rear panel. The dipole 

leads are connected to the screws marked 300 Ohm. The 
ground screw is not used for the dipole antenna. The dipole 
should be unfolded to its full T-type size and oriented for 
optimum performance. Dipole antennas are most sensitive to 
FM reception when positioned perpendicular to the station. 
Exterior FM 300 Ohm Antennas. For fringe [weak signal] areas, 
or areas where interference to FM reception is high, the use 

of a log-periodic, or Yagi-type antenna system is 

recommended. These antennas are directional and high gain 

in nature, thus tending to reduce most undesired interference 
due to reflected signals [multipath distortion} and ignition 
noise. In areas where stations are located in different directions 
from the point of reception, the antenna must be repositioned 
for optimum reception of individual stations. For this reason, 

a good quality rotor is suggested. To minimize the introduction 
of multipath distortion and ignition interference by the antenna 
lead-in wires, the use of balanced 300 Ohm [twin lead] cable 

is recommended. Unshielded twin-lead is suitable where the 
lead-in wire length from the antenna is short, and when used 

it should be twisted at the rate of 1 to 2 turns per foot. Long 
lead-in wires can act as omnidirectional antenna and can cancel 
out the advantages of directional antenna systems. Unshielded 
twin-lead is also more susceptible to ignition noise than shielded 
cable. 

Exterior FM 75 Ohm Antennas. A second set of antenna 
terminal is provided for connecting ап unbalanced 75 Ohm 
antenna cable. These terminals should be used whenever a 

75 Ohm coaxial cable is used as a lead-in cable from the 


Tuner Power Supply 


Plug the power cord plug into the wall outlet, supplying 
220V 50 Hz AC. To be sure of protecting the memory 
information, the power cord plug should be plugged into the 
outlet even when the stereo system is not in operation. If the 
AC power to the tuner is interrupted for more than 24 hours 
(due to power failure, etc.), the memory information will be 
completely lost. 


Control Functions 


15) 


1 Power Switch. Turns the unit on. Lights up when power 

is on. 

2 Multipath Switch. When depressed, turns the signal strength 
indicator function to multipath interference indication. The 
minimum multipath interference is indicated by minimum 
indication of the indicators. 

3 Multiplex Filter Switch. When depressed, a special filter 
circuit is introduced to reduce the high frequency noise in 
weak FM stereo reception. This filter does not affect frequency 
response but reduces slightly the high frequency stereo 
separation. 

4 Stereo/Mono Switch. Determines the manner in which a 
received station will be reproduced through the tuner. When 
listening to a stereo FM broadcast, depressing this switch will 
cause the unit to mix the left and right channel signal detected 
from the broadcast and reproduce it through both channels 
monophonically. The released Stereo setting of this switch 
will provide automatic stereo FM reception. The mono or 
stereo mode is indicated by the Mono/Stereo indicators. 

5 Scan/Mute/High Switch. This switch should normally be set 
to released position, especially when you wish to listen to very 
weak FM stations. In the depressed [High] position, the 

mute level during scanning over the band, which a signal must 
overcome in order to stop the scanning and be heard will be 
high and only strong signals will be tuned in. 

6 Short-Time-Hold [STH] Switch. Used when automatic 
scanning to resume scanning automatically after tuner has 
paused on a station for 5 seconds. If you choose to continue 
listening to that station, depress the Hold pushbutton within 

5 seconds. 

7 Auto/Manual Switch. Determines the manner of Tuning-Up/ 
Down pushbuttons usage — automatic-scan or manual 


Tuner Operation 


With the tuner installed properly as outlined, proceed as 
follows: 

FM Tuning. Set the AM/FM switch to FM (pushbutton 
released). When the tuner is first switched on after 
plugging the power cord to wall outlet, the lowest FM 
frequency (87.5 MHz) is tuned. Otherwise, eachtime you 
turn on the tuner, the previously selected frequency is 
selected. Set the Auto/Manual switch to Manual 
(pushbutton released). Press the Tuning-Up switch to tune 
upscale and press the Tuning-Down switch to tune 
downscale. Each time either the pushbutton is depressed, 
the unit is tuned to the next available FM station 
asignment precisely 50 kHz away. No fine tuning is 
necessary. To tune upscale or downscale rapidly, press the 






14 


one-by-one tuning. 

8 FM/AM Switch. Selects AM or automatic FM stereo . 
reception. 

9 Memory Pushbutton. Used to preset 7 AM and 7 FM 
stations for automatic pushbutton tuning. 

10 Mode Indicators. Mono, lights up to indicate that the 
tuner has switched to monophonic FM reception. This 
indicator is inoperative in AM. Stereo, lights up to indicate 
that the tuner has switched to stereo FM reception. 

11 Signal Strength/Multipath Indicator. Normally used for 
tuning on both AM and FM bands, with the Multipath switch 
released. When the Multipath switch is depressed, it can be 
used as reference to multipath interference. 

12 Digital Frequency Display. Shows the frequency of a 
station to which the unit is tuned directly. Also indicates AM 
or FM mode and sign to accept the memory presetting. 

13 Tuning-Up/Down Pushbuttons, When the Auto/Manual 
switch is released (Auto position), these pushbuttons will start 
the automatic-scan to a station either upscale or downscale. 
When the Auto/Manual switch is depressed (Manual position), 
each time depressing either of these pushbuttons will tune the 
unit to the next available station assignment precisely 50 kHz 
away for FM and 9 kHz for AM. 

14 Hold Pushbutton. Used when automatic-scan with the 
STH button depressed, to stop the scanning at the desired 
frequency. If the Hold pushbutton is not depressed within 5 
seconds after the scan has stopped at a station, the unit will 
scan automatically to the next station. 

15 Memory Pushbuttons. Used for automatic memory 
pushbutton tuning on AM and FM. Each of 7 pushbuttons 
may be preset to both AM and FM stations. 


either Tuning switch and hold it in position. Release the 
switch when you have tuned to the desired station. If 
you tune beyond the ends of the scale the unit tunes 
automatically to the opposite end and continues. 


AM Tuning. Set the AM/FM switch to AM (pushbutton 
depressed). When the tuner is first switched on after 
plugging the power cord to wall outlet, the lowest AM 
frequency (531 kHz) is tuned. Otherwise, each time you 
turn on the tuner, the previously selected frequency is 
selected. Set the Auto/Manual switch to Manual 
(pushbutton released). Press the Tuning-Up switch to tune 
upscale and press the Tuning-Down switch to tune 
downscale. Each time either of the pushbuttons is 


depressed, the unit is tuned to the next available AM 
station asignment precisely 9 kHz away. No fine tuning is 
necessary. To tune upscale or downscale rapidly, press 
the either pushbutton and hold it in position. Release the 
button when you have tuned to the desired station. If 
you tune beyond the ends of the scale the unit tunes 
automatically to the opposite end and continues. 


Automatic-Scan. Іп addition to the manual station tuning by 
making use of the Manual setting of the Auto/Manual switch, 
your tuner is equipped with the automatic-scan tuning. Use 
either manner а or В depending on the selection ofthe STH 
switch: 

а Set the STH switch released (Off). Set the Auto/Manual 
switch to Auto. Press the Tuning-Up or -Down switch. The 
tuner will scan to a station and continue receiving that 
station. To rapidly scan-tune from station to station, press 
the Tuning-Up or -Down switch for each change. 

b Set the STH switch depressed (On). Set the Auto/Manual 
switch to Auto. Press the Tuning-Up or -Down switch. The 
tuner will scan to a station and pause on it for 5 seconds. 

М you choose to continue listening to that station, press the 
Hold switch (or release the STH switch). If the Hold switch 
is not depressed within 5 seconds, the tuner will scan to the 
next station. Be sure to press the Hold switch if you choose 
to continue listening to that station. 

Pushbutton Tuning. Each of 7 pushbuttons may be preset to 
an AM station and an FM station for automatic pushbutton 
tuning (7 AM/7 FM; 14 in all). Set the AM/FM switch to the 
desired position. Adjust the Tuning-Up/Down switches for 
the desired station. Press the Memory switch. Now the word 
Memory appears on the frequency display area to indicate 
that the unit is ready to accept the memory, for 5 seconds. 
Press the pushbutton within 5 seconds to set the station. Now 
the word Memory should disappear from the display. Repeat 
above steps for each pushbutton. You may later use 
pushbutton to select the station you wish to hear. If your 


Trouble Shooting Guide 


The following guides are intended as an aid in correcting the 
problems you may encounter when setting up the stereo 
system. Although suggested remedies might seem quite 
elementary, they may be sufficient to make the corrections 
without returning the unit to your dealer. 


Problem Suggested Remedy 

Tuner inoperative, when 1 Check for proper power cord 

power switched on. insertion to the wall outlet. 
2 Blown internal fuse [Be sure 
to refer checking to qualified 
personnel] . 


Indicator lights up but 
no output from the 
associated amplifier. 


1 Check proper program selection 
on your amplifier. 2 Check 
proper tuner output connection to 
the amplifier. 


No output one channel. 1 Refer to above. 2 Interchange 
audio cables to input jacks to 
check if the same channel remains 
inoperative. 


failed to press the pushbutton within 5 seconds after the 
Memory pushbutton is depressed, depress the Memory 
pushbutton again. When the unit is in auto-scan mode, 
Memory switch is inoperative. 


FM Stereo Reception. When tuned to an FM stereo 
broadcast, the tuner will automatically switch from mono to 
stereo operation, provided that the Stereo/Mono switch is set 
to Stereo. Stereo broadcasts are indicated by the 

illuminated Stereo indicator. Maximum reduction of 
background noise on weak stereo stations will be obtained by 
switching the Stereo/Mono switch to Mono. This will, of 
course, put the tuner in a monophonic mode of operation. 
When listening to weak stations, the Scan/Mute switch should 
be released to prevent the tuner from switching to a mute 
condition due to reduced signal strength. 


FM Multipath Indicator Operation. FM multipath distortion 

is caused by a broadcast signal reaching the receiving antenna 
from 2 directions; #1 direct from broadcaster to the tuner, 

#2 the same signal but received as a reflection from a nearby 
building or other surfaces. This indicator is operative only 
when receiving an FM broadcast and the Multipath switch is 
depressed. Set the Multipath switch depressed. Set the AM/FM 
switch to FM. Adjust the Tuning-Up/Down switches for a 
fairly strong signal. № more than 2 dots of the indicator are 

lit, considerably strong multipath interference is 

suspected. In cooperation with other people, rotate the 
antenna mast to position your antenna for minimum indication 
on the Multipath (Signal Strength) indicator. Proper FM 
reception free from multipath distortion is indicated by the 
minimum (ideally none) lighting up on the indicator. To 
revert to normal signal strength indication, reset the 

Multipath switch. 

It is recommended that the multipath interference check is 
made during no modulation condition of the FM broadcast 
being received, if really possible. 


Weak AM reception. 1 Position loopstick antenna for 
maximum station pick-up. 

2 Locate tuner away from metal 
surface. If building construction 
uses alminum foil faced instruction, 
metal lath, or stee! framing, AM 
reception will be poor. 

3 Install external AM longwire 
antenna. 4 Locate tuner away 
from TV set as possible. 5 Locate 
external AM antenna as far away as 
possible from interfering source. 

6 Install proper earth ground. 


1 Check all external antenna 
connections. 2 Install a properly 
designed antenna. 3 Position 
receiving antenna for maximum 
signal. 


Weak FM reception. 


Multipath distortion. Caused by a broadcast signal 


reaching the FM antenna from two 


directions; #1 direct from 
transmitter [broadcast], #2 the 
same signal but received as a 
reflection from a nearby building 
or other surfaces. Install external 
antenna. Position receiving 
antenna for minimum distortion 
[while observing the multipath 
indicator on the tuner]. 


1 Install external antenna. 2 Use 
shielded lead-in wire. 3 Install 
proper earth ground. 4 Rotate 
antenna for maximum signal. 

5 Connect power line filters to 


Noisy FM reception. 


Circuit Description 


PLL Frequency Synthesizer (Local Oscillator) 

The FM local oscillator is comprised of a transistor 03 and 
a tuning circuit including an oscillator coil T4 and tuning 
capacitor D4 (varicap diode). The transistor 03 is being 
oscillated at a frequency of a receive frequency + 10.7 MHz, 
and its output is applied to the prescaller ІС U6 through a 
buffer amplifier 04. Тһе prescaller U6 counts down the 
local oscillator signal frequency into a lower frequency (1/20) 
suitable for phase comparison in the PLL circuitry. Thus 
obtained low frequency is applied to the pin 3 of PLL IC U3 
through a buffer amplifier 08, and the resultant phase error 
signal developed at pin 10 is applied to the active LPF filter 
consisting of transistors 010 and Q11. Finally the filtered 
error signal is applied to the oscillator tuning capacitor (vari- 
cap diode) D4 to correct (or to generate a new) oscillating 
frequency. | 

In case of АМ local oscillator operation, the oscillating signal 
output from the AM oscillator is directly applied to the PLL 
IC input circuit (pin 3) through a buffer amplifier 09, and the 
resultant DC error signal is fed back to the AM oscillator 
tuning diode D6 also through the LPF filter to correct the 
oscillating frequency. 

The FET transistor 057 is а lock-out signal amplifier, the gate 
of which is connected to the pin 10 of U3 where a lock-out 
signal is being developed while a phase locked condition is 
not established in the U3. The transistor 057 amplifies the 


Block Diagram of FM IF System IC, U5: *“ 


interfering appliances. 


Stations will not enter 
memory. 


1 Before attempting to enter 
stations into memory 
pushbuttons, press the Memory 
switch. 2 Press memory 
pushbutton within 5 seconds as 
Memory indicator is being оп. 
Scanning will not stop. 1 Be sure to press Hold switch if 
you are using STH feature. 

2 Check antenna connections. 
Scanning will not stop 1 Set Scan/Mute switch released. 
on weak stations. 


signal and the amplified signal is then rectified by diode D9 
and D8 to develop DC voltage to be used for muting control, 
thus reducing undesirable noises during scanning operation 
(lock-out condition, etc.). 


FM Front End and IF 


The FM front end consists of two dual gate FETs and a local 
oscillator and its buffer. The first FET is used as a FM ВЕ 
amplifier and the second as a Mixer amplifier. Each gate of 
the mixer is connected to the RF amplifier output and a local 
signal injection circuit, respectively. The mixed and resultant 
IF signals are then led to the IF amplifiers consisting of 
05, U4 and U5. The U5 is a multi-function IF system IC 
including, three stages of limiter/amplifier, FM quadrature 
detector, meter driver, audio mute signal drive, etc. For 
further detail of the IC refer to the block diagram shown 
below. 

The detected audio outputs (mono or stereo composite 
signals) are developed at pin 6 of U5 and applied to the pin 2 
of MPX decoder IC. The decoded left and right channel 
outputs are obtained at pin 6 and 7 of the decoder IC and 
led to the Tuner Out jacks through low pass filters and one 
stage of audio amplifier. 





METER ORIVE 


MUTE ADJ 


¥ 


МРХ Stereo Demodulation 


The stereo decoder IC U9 operates as a stereo decoder when 
it pin 16 is applied by a voltage lower than 1.4V. First in- 
verter output (pin 6 of U8), which develops a high output 
with increased antenna signal input, is connected to the 
transistor base of 018 and makes the 018 conductive when 
the FM antenna input signal level is increased, then the pin 16 
of U9 is grounded through the emitter-collector of 018 and 
STEREO/MONO switch, resulting in stereo mode of opera- 
tion or a high voltage during mono mode operation, and 
these voltages are utilized to make the stereo/mono lamps 
turn on or off. 

When FM antenna signals higher than the stereo threshold 
level is applied to the antenna circuit, the pin 4 of U8 be- 
comes low, and this makes 013 conductive (this is a common 
circuit for stereo & mono LEDs.). 

On the other hand if the U5 operate in stereo mode of opera- 
tion, the pin 9 develops a low output, then the stereo LED 
will turn on. However, if the pin 9 develops a high output, 


Signal Meter 


The FM system IC 05 develops a meter drive voltage at its 
pin 13 and it is led to the pin 2 of IC U10 (meter amplifier/ 
driver) through the MULTIPASS/METER switch. The U10 
amplifies the signal and drives each meter LED connected 
to its appropriate pin terminals 9 through 13, depending on 
the signal strength being received. 

For AM operation, AM meter drive signal is also connected 
to the same input pin terminal of No. 2 of IC U10. 


Muting Operation 


1. FM Muting 

The pin 12 of FM IF system IC develops a positive voltage 
in the event of a low IF input signal level to drive the muting 
circuit. The positive voltage is first applied to the first in- 
verter pin 7 of IC U8 and the output is obtained at the second 
inverter pin 4 (since the first and second inverter is connected 
in serial, the second inverter output is in phase with the first 
inverter input). The output is then connected to the pin 21 
of the controller ІС U1. The U1 is designed to develop a logic 
high voltage at its pin 3 when the pin 21 is applied by a logic 
high voltage. Since the pin 3 is connected to the base of first 
muting stage of Q19 through the AUTO/MANUAL switch, 
the Q19 is turned on in the event of low IF input, and this 
makes all transistors 043, 044, 045 and 046 conductive to 
the ground, thereby muting out the audio signals. 

2. Muting During Scanning Operation 

During scanning operation, the muting circuit is also actuated 
to eliminate undesirable noises caused by scanning operation, 
since the controller 1С U1 also develops the high level voltage 
at its pin 3 in addition to the lock-out amplifier output pre- 
viously stated. And the FM circuit will be muted as described 
just above. 

On the other hand, in the AM circuit the base of 06 is sup- 
plied from the pin 3 of U1 (logic high) and becomes con- 
ductive, thereby shorting out the detector output. 


the transistor 022, the base of which is connected to the 
pin 9, is turned on, the cathode side of the mono LED is 
grounded through collector-emitter path of Q22, thus the 
mono LED is turned on. 


Block Diagram of MPX Stereo Decoder IC: 


ia] fos] [21 (|1) 
PHASE LOCK PLOT STEREO 
НЕ ЕК жы БЕ 


|| 76KHz TO ж 38кн: TO | | 38KHz ТО 
38KHz Өк: !экнт 
DIVIDER Е OVIDER || DIVIDER 


LCH 
POST AMP 





Scan Stop Operation 


To secure good scan stop accuracy, the scan stop drive signal 
must have a narrow, sharp characteristic with its center coin- 
cided with that of IF bandwidth. This will be accomplished 
as follows: 

As already described, during scanning operation, pin 3 of U1 
develops a high voltage, and this is applied to the base of 
Q26 and makes it conductive, then the FET 032 is cut off 
and the resistor connected across the FET is directly con- 
nected to R57 in series. The increased resistance makes final 
IF bandwidth narrow. 

In case of AM operation, a fraction of IF output signal is 
obtained and further amplified by a narrow band additional 
IF amplifier consisting of amplifiers provided between pin 9 
and 10 and pin 11 & 12 of U8. The amplified output is rec- 
tified by diodes D17 and D18 and the output is led to the 
inverter provided between the pin 14 and 15 of the same IC. 
A transistor Q12 also operates as an inverter, the collector of 
which is connected to the last inverter provided between 
ріп З апа 2. The output developed at the pin 2 will operate 
in the same way as that of pin 4 in case of FM operation. 


AM Tuner Circuit 


Most of the AM tuner circuit are integrated in one mono- 
lithic 1С U7 consisting of a RF amplifier, local oscillator, 
mixer, detector, meter driver, etc. For detailed information 
refer to the block diagram shown below. Incoming antenna 
signals are applied to the pin 1 of U7 and the final detected 
audio output is obtained at pin 12, and the amplified audio 
output is developed at pin 9. The pin 9 output is split into 
two and applied to each left and right channel LPF filter 
circuits in the FM MPX stereo circuits through R149 and 
R150. Transistor 017, the colector of which is connected to 
the AM audio signal line, is also one of muting circuits. 


Block Diagram of AM Tuner IC: 


TO SIGNAL METER 


SIGNAL 
METER 
ORIVE 


RF SIGNAL INPUT 


Service Information 
Alignment Procedure 


1. Measurement condition 
1) Reference temperature: 25°C 
2) Reference humidity: 65% | 
NOTE: Unless otherwise specified, adjustment may be 
conducted under the room temperature of 
5 — 35°C and the room humidity of 45 — 85%. 
3) Power supply 
Voltage: AC 220V + 1%, 
Frequency: 50 Hz + 2%, 
THD: less than 2%. 


2. Test equipment 

Any test equipment to be used in this alignment should 

have its known accuracy and capability to operate within 

a range of specified tolerance described in the electrical 

specifications. А! test equipments to be used should be 

properly calibrated. 

1) FM signal generator: 

2) FM MPX stereo modulator 

3) Audio signal generator: 20— 20 kHz 

4) Audio analyzer (Distortion meter) 

5) Audio level meter or 

VTVM: 0.5 mV – 10V 

6) Frequency counter: 200 MHz, high input im- 
pedance type 

7) Oscilloscope: 1 mV/cm or higher 

8) Center meter or Null meter 

9) DC voltmeter: High input impedance type 

10) FM dummy antenna 


30 — 200 MHz 





3. Operation and standard setting 
3.1 Operation of controls and switches 

a) POWER (power switch): This switch makes the se- 
condary of the power transformer open or close. In the 
off mode the back-up current is available for the me- 
mory, which is indicated by LED indicator. When the 
power plug is taken off the AC outlet, the memory 
will be erased after 24 hours. 

b) MULTIPATH (multipath switch): This switch is used 
to indicate the multipath distortion by the LED meter 
by depressing the switch. The FM antenna should be 
adjusted to achieve the minimum distortion. By re- 
leasing this switch the LED meter on front panel serves 
for normal signal strength indication. 

c) MPX -FIL (multiplex filter): When depressed this 
pushbutton activates a circuit which reduces high fre- 
quency noise in weak FM stereo reception. This filter 
does not affect frequency response but reduces slightly 
the high frequency stereo separation. 

d) STEREO/MONO (mode switch): Determines the 
manner in which a received station will be reproduced 
by tuner. 

STEREO (released): Provides stereophonic reception 
of any stereo broadcast. This pushbutton also provides 
automatic FM stereo reception. 

MONO (depressed): Тһе left and right channel signals 
detected from FM broadcast are mixed and reproduced 
through both channels. 


в) SCAN LOW/HIGH 
LOW: Releasing of this pushbutton will introduce a 
special muting circuit which eliminates noise between 
stations on FM when scanning. 

HIGH: Maximum reduction of background noise on 
weak stereo stations will be obtained by depressing 
the SCAN LOW/HIGH pushbutton. This will, of course, 
put high frequency component in the program material 
in a monophonic reproduction. In this position, the 
mute is switched off to prevent the tuner from switch- 
ing to a mute condition due to weak signal strength. 
San stop level is as shown: , 
ЕМ LOW: 20 + 4 dBf 

HIGH: 38 + 3 dBf 
АМ LOW: 57 + 2 dBu/m 

HIGH: 67 + 3 dBu/m 

f) STH (short-time-hold pushbutton): When depressing 
the UP or DOWN for automatic scanning, a pause for 
5 seconds should be provided by depressing this push 
switch before resuming scanning. As long as this switch 
is depressed 5 seconds pause shall be repeated. 

9) UP/DOWN (tuning pushbutton): When the AUTO/ 
MANUAL pushbutton is set to AUTO position, it will 
start scanning either upward or downward the receive 
frequency. 

When the AUTO/MANUAL pushbutton is set to 
MANUAL position, at each time of depressing either 
of the pushbuttons {һе receive frequency will be tuned 
to the next available station assignment by 50 kHz 
(U.S.A. 200 kHz) spacing for FM and 9 kHz (U.S.A. 
10 kHz) spacing for AM. 

Keep depressing either of pushbuttons more than 1 
second, receive frequency varies serially, and stop when 
release the pushbutton. 

h) AUTO/MANUAL (tuning mode pushbutton): De- 


5. FM alignment 
5.1 Receive frequency preset 
Preset the following frequencies to memory before start- 
ing all alignment procedures: 
(1) 87.5 MHz 
(2) 90.0 MHz 
(3) 98.0 MHz 
(4) 106.0 MHz 
(5) 108.0 MHz 
(6) 108.0 MHz 
1) To preset memory 
a) Frequency indicator reads either 87.5 MHz or 108.0 
MHz when turning power on. Push memory preset 
switch from 1 — 7. 
b) Keep depressing either UP or DOWN in MANUAL 
mode. 
As the frequency approaches to the designated fre- 
quency, temporarily release the button. Then press 
it step by step to tune exactly to the frequency, 
where MEMORY button should be pushed before 
pushing one of the 7 buttons. 
c) Check the frequencies above have been preset cor- 
rectly on each pushbutton. 
5.2 PLL local oscillator circuit alignment 
5.2.1 Reference frequency adjustment 
1) Connect frequency counter to TP-3. 
2) Adjust CT-7 for 11.5200 MHz + 100 Hz. 


termines the mode of electronic tuning — automatic 
scanning (AUTO) or manual one-by-one tuning 
(MANUAL). 

In MANUAL mode the receive frequency is selected 
channel after channel by UP or DOWN pushbutton, 
enabling a weak antenna input below the muting level 
to be received. 

In AUTO mode scanning starts when UP or DOWN 
switch is depressed, scanning halts where the level of 
antenna input exceeds a certain value which is nearly 
equivalent to the muting level. 

In AUTO scanning, scanning function prevails, defeat- 
ing the memory function. 

i) FM/AM: Selects AM or automatic FM stereo reception. 
When depressed it selects automatic FM stereo reception 
and when released it selects AM reception. 

j) MEMORY: Used to preset AM and FM stations for 
automatic pushbutton selection. When this switch is 
depressed “MEMORY” is indicated for 5 seconds. By 
pushing in one of 7 memory preset buttons during 
this 5 second period the frequency on the display is 
memorized. 

k) 1 — 7 (preset pushbutton): Used for automatic memory 
pushbutton tuning on AM and FM. Each of 7 push- 
buttons may be preset for both AM and FM stations 
individually. 

|) HOLD: Used to stop scanning at the desired frequency 
while scanning automatically. 


4. Memory back-up check: Confirm 8V at emitter of 0-25 
for the back-up current while the AC power source is off. 
Use a low resistance tester or connect approximate 5 КОћт 
resistor between + terminals when confirming the back-up 
current. ; 


5.2.2 Vari-cap control voltage adjustment 
1) Connect voltmeter between TP-4 and GND. 


2) Depress preset-button 5 or 6 (108.0 MHz), adjust 
CT-4 for 9.6V. 

3) Depress preset-button 1 (87.5 MHz), adjust T-4 for 
3.4V. 

4) Depress preset-button 5 or 6 (108.0 MHz), adjust CT-4 
for 10.0V 


5) Depress preset- -button 1 (87.5 MHz), adjust T-4 for 
3.4V. 


6) Repeat steps 4) and 5) until 10.0V + 0.1V is obtained 
at 108.0 MHz and 3.4V + 0.2V at 87.5 MHz. 
NOTE: Use high input impedance Voltmeter. 
If procedure in step 2) will not provide result 
as indicated, adjust T-4 first. 
5.3 RF IF circuit adjustment 
Connect Voltmeter (low impedance type) between TP-1 
and TP-2. Output deviation of signal generator should be 
- within +2 kHz. 
5.3.1 IF adjustment 
1) Set signal generator to 98.000 MHz, depress preset- 
button 3 (98.0 MHz). Adjust T-12 for Voltmeter read- 
ing within +20 mV. 
2) Connect level meter to output terminal, adjust T-5, 
T-6 for maximum receive sensitivity by reducing the 
output of the signal generator. 





5.3.2 Front End adjustment (Sensitivity adjustment) 

1) Set signal generator to 90.000 MHz, depress preset- 
pushbutton 2 (90.0 MHz). Adjust T-1, T-2, T-3 alter- 
nately for maximum scope display. 

2) Set signal generator to 106.000 MHz, depress preset- 
pushbutton 4 (106.0 MHz). Adjust СТ-1, СТ-2 and 
CT-3 for maximum scope display. 

3) Repeat steps 1) and 2) until maximum scope display 
is obtained at both frequencies. 

4) Adjust CT-7 to obtain maximum sensitivity if wave form 
is not symmetrical. 

5.3.3 Distortion adjustment 

1) Set signal generator to 98.000 MHz, depress preset- 
button 3 (98.0 MHz). 
Antenna input level: 65 dBf 

2) Adjust T-13 to obtained minimum distortion on THD 
meter. 


5.4 MPX circuit adjustment 
Connect MPX signal generator to standard signal generator. 
Test circuit sets up as shown: 


FREQUENCY 
COUNTER 


TUNER 





PIN 9 OF U6 


98.0 MHz £2KHz 
ANT. INPUT: 65 dBf 


( NO MOD.) 


19.00 KHz + 50Hz 


MODE. STEREO 


ADJUST RV 6 FOR 19 OKHz+50Hz 


5.4.2 Separation adjustment 

1) Apply 65 dBf MPX signal to antenna input. 

Rotate RV-5 for minimum reading on right channel 
Voltmeter. 

2) Apply 65 dBf MPX signal generator output level modu- 
lated with 1 kHz right channel signal to antenna input. 
Check for minimum reading on left channel Voltmeter. 

3) If leakage on each channel is not equal, rotate RV-7 
to a point at which provides equal leakage on both 
channels. 

5.4.3 Stereo level check 

1) Feed signal generator modulated with standard stereo 
signal by MPX signal generator to antenna terminal. 

2) Check that stereo indicator lights up at antenna input 
level between 16 dBf and 24 dBf. 


6. AM alignment 
6.1 Receive frequency preset 
Preset the following frequencies to memory before initiat- 
ing adjustments: 
(1) 531 kHz 
(2) 603 kHz 
(3) 999 kHz 
(4) 1404 kHz 
(5) 1602 kHz 
6.2 PLL local oscillator circuit 
6.2.1 Vari-cap control voltage adjustment 


11 


3) Check that voltage between TP-1 and TP-2 is within 

+20 mV with no signal condition. 
5.3.4 Muting level adjustment 

1) Apply 38 dBf level to antenna input. Set the AUTO/ 
MANUAL Selector pushbutton to AUTO (pushbutton 
released) and the SCAN HIGH/LOW selector to HIGH 
(pushbutton depressed). 

Rotate RV-1 fully clockwise (RV-1 is located on 
PSSW213). 

2) Depress any one of memory preset pushbuttons, rotate 
RV-1 counterclockwise until mute is cancelled (when 
readjusting, depress the preset pushbutton each time). 
NOTE: If above procedure is inadequate, rotate RV-1 

to a point at which the level turns low to high. 

3) Set the SCAN LOW/HIGH selector pushbutton to LOW 
(pushbutton released), then check that mute is cancel- 
led at 20 dBf + 4 dBf. 


5.4.1 19 kHz (76 kHz VCO) adjustment 
1) Set MONO/STEREO selector pushbutton to STEREO 
(pushbutton released). 
2) Set signal generator output to 65 dBf (no modulation). 
3) Rotate RV-6 for frequency reading of 19 kHz + 50 Hz 
at IC U-9 #9 pin, then fix RV-6. 


5.4.4 Signal indicator adjustment 
1) Apply 60 dBf signal to antenna input. 
Adjust RV-5 so that all of 5 indicator dots light up. 
2) Apply 20 dBf to antenna input. Check that the 151 
dot lights up. 
3) Check that no dot lights up with no antenna input. 
5.4.5 Multipath indicator check 
1) Apply 45 dBf signal AM modulated 50! . 
MUTIPATH button. 
2) Check 4 dots of indicator light up. 
3) No dot should light up or only 1st dot may light up 
when readjusting signal generator to FM mode modu- 
lated with 40 kHz deviation. 


Depress 


1) Connect Voltmeter between TP-4 and GND. 
2) Depress preset-button 5 (1602 kHz), adjust CT-6 for 
9.2V. 
3) Depress preset-button 1 (531 kHz), adjust T-8 for 
1.6V. 
4) Repeat steps 2) and 3) until 1.6V + 0.05V is obtained 
at 531 kHz and 9.2V + 0.1V at 1602 kHz. 
NOTE: Use high input impedance Voltmeter. 
If procedure in step 2) will not provide result 
indicated, adjust T-8 previously. 


6.3 IF adjustment 
Use procedure (A) or (B). 
(A) Connect IF sweep input to output jacks. Connect IF 
sweep to AM antenna terminal. 
Adjust Т-9 for ‘correct’ wave form as shown. 


Х 


(non-linear) (correct) 


(B) Connect IF sweep input to IC U-7 #12 pin. 
Connect IF sweep output to AM antenna terminal. 
Adjust T-9 for higher and wider wave form on dis- 


play. 
cue 


450 kHz 


6.4 Sensitivity adjustment 

1) Pull out bar antenna away from rear panel. 

2) Connect test loop antenna to signal generator and locate 
the loop antenna 20 — 30 cm from bar antenna. Con- 
nect VTVM or level meter and oscilloscope to tuner 
output. 

3) Adjust signal generator to 603 kHz, 1 kHz modulated 
30%, depress preset-button 2 (603 kHz). Rotate core in 
bar antenna for maximum sensitivity. 

4) Adjust signal generator to 1404 kHz, depress preset- 
button 4 (1404 kHz). 

Adjust CT-5 for maximum sensitivity. 

5) Repeat steps 3), 4) until maximum sensitivity is ob- 
tained at both 603 kHz and 1404 kHz. 

6) Check that the sensitivity is within the specifications 
at 999 kHz, and the output level is +3 dB. 

6.5 Signal meter adjustment 
Increase signal generator output to 80 dBu. Adjust RV-2 
so that all of 5indicator dots light up (use 200 pF antenna). 
6.6 Scan-stop circuit adjustment 

1) Apply 57 dBu* 999 kHz signal generator 400 Hz modu- 

lated 30% output from test loop antenna positioned 


O 


12 


(unsymmetrical) 


NOTE: Check the marker is approximately at the 
center which is 450 kHz. 
Do not apply overloads level input. 
Adjust T-10 for maximum and symmetrical wave 
display. 


60 cm from unit bar antenna. 

* = Signal generator scale 83 dBucontaining 26 dBu 

loop antenna loss. 

2) Set the unit to AUTO mode, SCAN LOW/HIGH to 
LOW. Rotate RV-3 fully counterclockwise. 

3) Depress preset-button, then rotate RV-3 clockwise unit! 
the level is increased rapidly to clear wave form (or 
rotate RV-3 clockwise until level of U-1 #3 pin turns 
high to low). 

4) If readjustment is necessary, repeat step 3). 

NOTE: a) Adjust signal generator to 999 kHz. The 
tolerance within +50 kHz is only accept- 
able due to the very narrow scan-stop 
detector band width. 

b) Be sure to observe 400 Hz 30% modulated 
condition as modulation frequency and 
modulation ratio affect scan-stop level. 

c) Do not short-cut step 3) since scan stop 
signal is self-locked. 


_5) Set the SCAN LOW/HIGH pushbutton to HIGH. Adjust 


signal generator to 67 dBu, then rotate RV-4 clockwise 
until mute is cancelled. 


Block Diagram 


RIGHT CHANNEL 


043 45 4 
MUTE LEFT CHANNEL 


019 20.21 










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АМ STOP 


DETECTOR 


MONO / sc 
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PART МАМЕ 
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TAA39ASMCL2 


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VX222SWOOL 


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TAA35AUCALS 


PART CODE | PART, STOCK NUMBER PART NAME 


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PART NAME 
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АМСТ700%01 


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ЯРО906006Т 


РАКТ МАМЕ 
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PC-JOINT 


PART CODE 
APSLD134AA 


PART CODE | PART, STOCK NUMBER PART NAME 





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PSLD134COX 


PRINTED We3OARD 





ZLF1P7D8XA 


Fele INDICATOR 





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REMARKS 





1110000035 


РАКТ МАМЕ 
PeWeBOARD ASSY 


PC. JOINT 


PART CODE 
АР5СТ70011 





PART СОВЕ | PART, STOCK NUMBER PART NAME 


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EXPLODED |АР510134АА 


PeweBOARD ASSY 








EXPLODED |APSLD135AA 


PewWeBOARD ASSY 





EXPLODED |APSSW212AA 


Р.н.ВОАВО ASSY 





EXPLODED |APSSW213AA 


Рено ВОАКО ASSY 





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19 














Replacement Parts List Р 












ЕВЕР Г ес, cvements [Taasoasmces| | 
ASSEMBLY |ELEC» ELEMENTS |TAA39ASMCLL 

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BWG30655SW 





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RO25VJ560X 
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CARBON FILM Re 5% 


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QLBLNGLTYN (..Е.0.0100Е (М417ҮР GRANGE 


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ASSEMBLY |PeWs BOARD ASSY |АР$ТШ05500 
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ceramic САР. | зере sov -10s мо st | 


21 





















EXPLODED PART NAME PART CODE 
ASSEMBLY |Р.Н.ВОАВО ASSY |АР511/05500 


| REMARKS | PART CODE | PART, STOCK NUMBER PART NAME SPECIFICATIONS SYMBOLIC OR EXPLODED VIEW NO. | а 
| јсеасгәамаж | etre сардстток | _ 22040 iov (се | 
|______|-елолозмих | [вить сдраслтоа | мою у ies р) 
Г} Шаманы Го ТТ Шек CAPACITOR саз (121 С175  с182 
|_____|-еловтомх |. ент, capacsron| _ тео 











[| жю шю - 
алија ивице дар 
16% 
селєцоомх | әт. capactron) | 
сєлсаггтин | ат. сғстток| _oszzmeo sov ms | 
селсотознн | ат. сависттов | ameo зу mso | 
_________|-ут. слеаслток (родом sovu O 
ЕКЕН ТҮТІГІ а иә | 
ПТО "ет ЗО дал са ыа 

ут сеп я сыш саз сыз 

тини киеш ee eee | 


сеооа | ________| ут. сласток __ 
cevosronx | ет. caractron| __ | 







с 
an 
т 
ч с 






с127 (Сі28 (56 Сә 





166 C185 СӨЗ 





сеуезкздік нәт. сепа 0 | 
CEVESRTALK пут. capactron| _ 
ШҮНГЕН нит спо 










107 С117 C145 С146 








158 








'сатв C180 







TER ШЕ | 
ASSEMBLY |р,4.80АЯ0 А55Ү |АР5Т005500 
ЕКУТ, CAPACITOR 


—- ИШЕ мы ачаа 2702-52-74. 


3 





CG2H3R9KPB 


CKDBLO2ZFM 
CKOB103ZFM 


| [сковазакви CERAMIC 
——— рааш СЕКАМІС 0.022МЕО -20» +20% 
CKDB472ZFM CERAMIC 4700PF -20» +80% 


CERAMIC САР. 1000PF 50v -20, +80% F 


CERAMIC САР. 0.01МҒ0О 50v 














































CKOB473ZFM CERAMIC САР» 0.0417МҒ0 -20, +20% 


















CKDELO3PEM 


СКҒВ1032ҒТ 
CKFB223ZFT 


CERAMIC 0.01МҒ0 -0, +100% Е 


СЕКАМТС САР. 0.01MFD 50/ _ -20, «80% Е 
CERAMIC САР. 0.022МЕ0 50у -20, +80% 1с150 с151 











ПЕЕ Е ЕЕЗ Е ВЕ Е ВЕ ВЕ Е 2| | е | sa | л ofo] fee 
БЕВЕИЕНИЯЯНЦЕННЕЛЕНЕЗ! - 
т 
т 













ШШЕ = 
ASSEMBLY (P.W. BOARD ASSY_|APSTUOS50D 

Sie Gite! ae NOES пи SPECIFICATIONS SYMBOLIC OR EXPLODED VIEW NO. 
| |елмссав. | о.отмео sov -г0,+вох F Rik чи 
|_____- Қайық а» | 0-0&Т7МЕО 50у -20, +80% Е |С108 C157 :С159 :С161 








3 


е 
a 
m 
с 









Гы лама қы (ле (ик „Јаве 


морт 
соно | _________| рима capacttor | ік sov -10, siox _ (ыз ciso 

| еанвозкен | [avean сарсттов | ошто sov ~ros sior те 
|______|-омвлагзен | near саристток| запо зу -ss ess | Кыз (ле | | 
| fomaem] им ня сз 
|_____-рмвга:жтн | [avar caracrron|  22ооте зу зї, 
сварки | [mnan саРАСЛТОК| о.огмю _ 507 ~10» siox 
= | mae caracrron| оозмо sov -10, sior 
_____|-онезежти | mean caracrron| onosemro sov -10, sios | 
______-омвљвжжен | ______|ипаасармїтов о-оамо sov -10s sior _ | 

Г енмен [з зш Пс === 
______|-озслвеже |_________|тулоешех cape | їюю# юу =s, est (йе со 
Гы таа 

жағ |___-__ 


сксвьыкы | | 















cascesiscr sryroruex сар. | Ci cae 
COSC471LICF STYROFLEX САР. 470PF i 












100V -5, +5% c86 








КЕЗЕН |ељи волио assy [дезо |  — | 

ASSEMBLY |P.WeBOARO ASSY |АР57/05500 
_____|-пхаовомое | fremmer care | cre сз _ 

| [авизо | [инея сло. | 
[иын | [лима care | 
| ітавзооног | TRIMMER САР 
| 
иу 
пи 




















CERAMIC FILTOR 


FBR450A01L™M 
FBLORTF20M 
Ecaoasosaa | 


LFLSIKAOLT 








CERAMIC FILTER 























ReFeCe 








LF1L80JCOLK RF COTLe 














LF393JCO1K CHOKE COIL 











LF563JCOLK RF COIL 

















LF683JCOLK CHOKE COIL 


МВ6445Х001 
МВ76355001 








SHIELD 


тих. usted) 





HEAT SINK 


Ми20185001 











ШЫ ышы ыыы БЕНЕН 
ASSEMBLY |р.Н.ВОАВО ASSY |АР571/05500 

oie | ш-мен РУ БЕШ БИЕ КЕНЕШ 

БЕН E ГИ 

Хой тин и иши 


bas ez 4 

= 

r ШЕТЕН 

ТЕГІНЕ 

тыны | ашамен. ме | 
менее | шт Jumper 

а | SHORT JUMPER 

pstuosscox | raweboano | 
laocewsosca | [vrercapsorooe | | 
состтзаоео | ________|умсле roe О 
laocineoxxr | [oermanrun отове нео No-rank | 


SILICON DIODE EMIZ <5АМКЕМ> 
SILICON DIODE МА150 VF=1e2V9VR=35V NO-RANK 24MIN |012 


























BOARD ONLY 












































ASSEMBLY 15500. 
ASSEMBLY |p.weBOARD ASSY |АР5Т005500 
PART CODE | PART, STOCK NUMBER 






SPECIFICATIONS 














90551ЕВАХК 


Q02A1047XN === 
902 150E83A са 


51-0100Е 











ФЕМЕК МА1047 У2=4.4-5.0У МОМ. =4. ТУ 


МА1075 У2-7.0-7.9у МОМ.-7.5У 


К015ЕЗ3 У2-14.35-15.09У 











К04,. ЗЕВІ У2-4.04-4.29У 


онот | 
основи | | 
сонг | | 
а 
ПИЕ 
а] 
a 
тиш 
Ба 








ROSROEB3 У2-5.61-5.91Уу 








АМ6821 9-РІМ 1/20 DIVDER 























НА11225 FMrIF SYSTEM 


araosesacn | 
ЕЛІНЕ 


ММ1203 256-ВІТ С-М05 5ТАТІС КАМ 


MN6142 16-РІМ RADIO PLL SYNTHESIZER 
UPD4049 








24 









ые 
ASSEMBLY |Р.н.ВОАРО ASSY |АР517/05500 


PART CODE | PART, STOCK NUMBER SPECIEIGATIONS SYMBOLIC OR EXPLODED VIEW NO. 
ЕКЕН КЕСТЕ ШЕГЕСІ Se СЕН | Е 7 
9ТС0900ХСА | анбізған 25С900 Џ-КАМК 
97С0945АЕА | |тахнызток 25С945А Р%0-ЯАМК 


TRANSISTOR 





а) 


т 
i Б^ 


n 

























L-RANK 


ОТС1674ХАА 












27С1675ХВА TRANSISTOR 


атслегехво | ——sdrranstsror | |25с1626 0, Y-RANK NO ACCESSORIES 
larciessxaa | |rmanstsror _ [2501845 БУБ-ААВК 

jarciesexan | таныта |25146 озак | 
jaroossexen | |танзт®_  |esoese азк-ванк 

jorooes7xxn | мни | 
сткоозохет | (reansrsror GR__|25K30 OR 25K30A_GR-RANK 
larkoosexen |__________|твамззтов |256 ізн-анк 
lareoossxaa | [reansrsrorn | 


QTLOO49XBN TRANSISTOR 
CARBON FILM Re 
CARBON FILM Re 


ASSEMBLY [PeweBOARD Аз 2-2 ан 
ASSEMBLY (р.н .ВОАКО ASSY |АР5ТШ05500 

анна | райт cove | CODE | йкес алама | STOCK NUMBER 
EA 102X TTA FILM Re 


RD25PJ103X CARBON FILM Re 0.254. 10K OHM 5% i ‘R113 


KyL-RANK 

































К025РЈ100Х 0.254 10 OHM 5% 











0.25W 100 OHM 5% 




























SPECIFICATIONS "ТҮ 


со 
и 
5 


SYMBOLIC OR EXPLODED VIEW NO. 


R266 























CARBON FILM Re 0.254 100K OHM 5% 


К025РЈ10%Х 











RD25PJ105X 


о јоаввон епн в. | 
| carson eren ae | 
|________-ливон enn n: | 
|__________-лавом епн в. | озн 120K oms 5з 
| canton етан в. | ош 150 они 5% 
= гиз a 
ТЕВЕ 
НИЕТТЕ 1 


0.254 150K OHM 5% 





RD25PJ181X 


0.258 180 OHM 5% 





25 















ASSEMBLY |P.WeBOARD А55Ү |АР57/05500 
RD25PJ182X CARBON FILM Re 











SPECIFICATIONS SYMBOLIC OR EXPLODED VIEW NO. ыла 
нм 5% 


5% 










CARBON FILM Re 


RD25PJ183X 











К025РЈ184Х 


RD25PJ 220K 


CARBON FILM Re 


CARBON FILM Ke 


CARBON FILM Re 





















CARBON FILM Re 


CARBON FILM Re 8136 R141 


CARBON FILM Re 
CARBON FILM Re 
CARBON FILM Re 


| deamon ғин в. 
_________|-лава FILM Re 








‘R206 ‘R207 





8210 8211 




















CARBON FILM Re 0.25н 270K OHM 5% 









CARBON FILM Re 


0.258 330 OHM 





EXPLODED 
ASSEMBLY 





Р.М.ВОАВО ASSY |АР5170/05500 
PART CODE | PART, STOCK NUMBER 





"ТҮ 


со 
an 
т 
с 


SPECIFICATIONS SYMBOLIC OR EXPLODED VIEW NO. 
ARBON FILM Re | 04254 303K они st fes Res | 
CARBON FILM Re | о.25и ээк они szo | 








RO25PJ333X 





RD25PJ362X 


CARBON FILM Re 


0.259 3.6K OHM 5 


x 
CARBON FILM Re 0.25Н 360K OHM 5% 








RD25PJ364X 


RD25PJ392X 


К025Р./393Х 















5 
CARBON FILM Re 39K OHM 5% кал ‘R179 856 





















RD25PJ394X 


RD25PJ470X 


CARBON FILM Re 0.25Н 390K OHM 5% 











CARBON FILM Re 


CARBON FILM Re 


43K 

















CARBON FILM Re 25W „тк OHM 5 
CARBON FILM Re | о.25и-- 47K они st | 
CARBON FILM Re 0.258 470K OHM 


nozseser2x | о. z 
когзюзатах | sx 
PRN CARBON FILM Re 0.254 _ 5.6K OHM 5% 
о. 5% 
5% 


RD25PJ562X 


RD25PJ564X 


CARBON FILM Re 25W 560K OHM 
RD25PJ682X 


CARBON FILM Re 0.25н 668K OHM 


26 














R149 





IRISO (8236 R263 


















ASSEMBLY 5502 |_____ 

ASSEMBLY |p.WeBOARO ASSY |АР5ТЏ05500 

PART CODE | PART, STOCK NUMBER PART NAME SEECIGATHINS 
RD25PJ683X 
ће | 






QT 


< 


SYMBOLIC OR EXPLODED VIEW NO. 


с 
и 
m 
с 


CARBON FILM Re 


Fam 

т | nenne, | 

1 | carson епн в. | ossu 920 они 5% 
море | (carson вши в. | оси а.к онн эз 
| __|aoesesezax | [мас епн в. | огзи век онн эз 
[мон |_________|-маонешм в. | 0425" эю онн sx 
a | ___| 
пиш аа 
яна нити 
аии ом 
| 


0.25W 68K OHM 5% 





154 RITI 





| је [а | = [о | по | = | 





Ro25TJ103x | о.25и _ 106 онн 5% 
пог5та1о4х | 0.258 100K онч зх 
когэтэггзх | 
pozsrszrax | (carson ғым ke | oszsu zem они 5% 

_____ког5таазох | femson enge | оси asom sz | 
| |вогэтаззэж | [emaon тим к. | бы sakom sz | 
Г [юля | feaenon fitm к. | ызы зк они за 
| aozstserex | [carson frin re | 
| __|aozstusoix | (carson ium в. | 0-25 560 онн эз 
| мезмееніі| canton ennea | ошын вво онн за 
| |rozsvsroex | carson erun re | 
тн 
Е 
ie 


CARBON FILM Re 0.254 100K OHM 5% 


CARBON FILM Re 


RD25VJ104X 











RD25VJ105X 

















RD25VJ391xX CARBON FILM Re 0.258 390 OHM 5% 






DE а a 
ASSEMBLY (P.W. BOARD ASSY _|APSTU05500 
REMARKS | parr cone | part, 5тоск NuMBER | PART МАМЕ USED 
кан erry ~ [CARBON FILM Re 0.258 5.60 ОНМ 5% | ; } 
аонавзгтгв | [u-oxroe FILM es | 


RGHARJ561B M-OXIDE FILM Re 























RGLANJ680B M-OXIDE FILM Re 1 68 OHM 5% 





RG3ARJ 3308 M-OXIDE FILM R 








RPGNB20201 SEMI-FIXED гк OHM B-CURVE 








RPGNB20301 SEMI-FIXED 20K OHM B-CURVE 





RPGNB20401 |ЗЕМІ-ҒІХЕО 200К OHM _B-CURVE 





КРЈМВ10306 SEMI FIXED VRe 








RPJNB5SOLO2 |SEMI-FIXEO УВ. 





THG 248 001W _ |НЕАТЕВ TRANS. _ 














ТВАТ 20075 ВЕ COIL 








TROTBAOO2S 1.Ғ.Т. 
аселе. 


[тк1ондо1з | ТЕТ 
TRLOMMO1L8K RF COIL 


ТЕ10ММ019К | _______|е со. 
тк1оноози | ir con 
TRLOMQOO5M | dg со. 











wonezscess | COAXIAL CABLE 





27 










ШШШ аи мшш | 
ASSEMBLY |Р.Н.ВОАВО ASSY |APSTUO5500 

||| REMARKS | PART CODE | PART, STOCK NUMBER PART МАМЕ 
woszsonct | [pc somt 


SPECIFICATIONS 


QTY 
SYMBOLIC OR EXPLODED VIEW NO. USED 









HI-WRAP WIRE 








HI-WRAP WIRE 






WUGIGOEEXK 
















ШШ Р ышы Lorne БЕНЕН 
ASSEMBLY |Р.4.80АЯ0 А55Ү |APSTU05500 

ЕТЕРІН | arenen wrae | 
амен моа 





SYMBOLIC OR EXPLODED VIEW NO. USED 


YFL0000004 


УНЕОРО00 17 
ҮЈЕ0650032 В6Р-$НЕ-1АА 
ШЕ ҮЈЕ0850032 ТИНЕ JUNCTION JACK |В8Р-5НЕ-ТАА 








2120000036 





P.W. BOARD ASSEMBLY 








ASSEMBLY |р. а. ЗОАКО ASSY» |АР522086АА 
CYBERNET CUSTOMER'S CYBERNET 
PART CODE | PART, STOCK NUMBER PART МАМЕ 
Р527086С0Хх ho- a Қонақай 
ҮЈР0250090 
АР522.086АА 





SPECIFICATIONS SYMBOLIC OR EXPLODED VIEW NO. 


PRINTED И. BOARD ONLY 


т 
5 < 


2Р PIN JACK 
BOARD ASSY PRINTED М, BOARD ASSEMBLY 


С 
= 


28 





NOTE. 


Schematic Diagram 














TRANSISTORS 








оза 25с945(ң0) 





Р5Т0055С0Х 


— о! 364518) яв ох 
w 





Q32 25к68(1,М) 


+ у аР SIDE VIEW 
C6 ane aise 
|/50У % ЕЗ бек 


2 


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502 
ан 


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Wy 
R49 220 
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2ЅАТЗЗ(Р,0) 





















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251826 
250837 






































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ap 


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25С945 
REE | 
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D23 MAISO 


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25С945(Р,0) 012 25С945(Р,0) 


хани те ЕКИ НИН |: Ж | H 
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му 


RIZ? 47k 






























cis? 
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029, © 25С1675 
тип 25С1674 
254733 

254564 
— 25С!685 
254720 
кеде 25С828 
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25С945(Р,0) 


















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RIG 56к 
твк 





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PSZZO86COX Е EMITTER 


С. COLLECTOR 


[ | В ВАЗЕ 








R205 22h 



































148 


923 
250636(0,8) 1 








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на! зак сі25 1200p @) 














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- ©) 
NOTE: PSLDI34COx 


1. ALL VOLTAGES MEASURED FROM COMMON NEGATIVE CHASSIS GROUND WITH VTVM АТ NO SIGNAL. 
2. CAPACITORS VALUSE ARE IN yF UNLESS OTHERWISE NOTED P= PICO FARAD 

3. RESISTORS VALUES ARE IN OHM КК OHM 

4. # ADJUSTED (TYPICAL VALUE SHOWN) 


29 | 30 


Cybernet Electronics Corporation 


Cybernet f urope S.A Mercure Centre 
Raketstraat 100 
B-1130 Brussels 
Belgium Tel. 02-720, 90, 20 


Cybernet International Inc 7 Powder Horn Drive 
Warren, New Jersey 07060 
U.S.A. 
Tel. (201) 560-0060 


Head Office 344 Shinsaku 
Takatsu-ku 
Kawasakı 
Kanagawa 213 
Japan Tel. 044 (888) 1111 





< Cybernet 


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