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13

0 dB = 0.775 V

1. Clean the following parts with a denatured alcohol-moistened

swab :

record/playback heads

pinch roller

erase head

rubber belts

capstan

idlers

2. Demagnetize the record/playback head with a head

demagnetizer. (Do not bring the head magnetizer close to the
erase head.)

3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power

supply voltage (9V) unless otherwise noted.

2.95 – 6.86 mN • m

(30 – 70 g • cm)

(0.42 – 0.97 oz • inch)

0.15 – 0.53 mN • m

(1.5 – 5.5 g • cm)

(0.021 – 0.076 oz • inch)

more than 5.88 mN • m

(more than 60 g • cm)

(more than 0.83 oz • inch)

more than 5.88 mN • m

(more than 60 g • cm)

(more than 0.83 oz • inch)

CQ-102C

CQ-102C

CQ-201B

CQ-201B

FWD

FWD
back tension

FF

REW

more than 100 g

(more than 3.53 oz)

CQ-403A

FWD

load impedance

32 

Ω

output signal level

0.25 V (–10 dB)

WS-48A

3 kHz, 0 dB

tape speed adjustment

Procedure:
Mode: playback

Adjust so that the value on the digital frequency counter is
3,000 Hz.

2,910 to 3,090 Hz

Adjust so that the frequency at the beginning and that at the end of
tape winding are between 2,910 to 3,090 Hz.

i 

jack (J371)

set

32 

Ω

test tape
WS-48A
(3 kHz, 0 dB)

digital frequency 
counter

Tape speed adjustment
control inside motor

14

0 dB = 1 

µ

V

Setting:
Function: RADIO
Band: AM

Setting:
Function: RADIO
BAND button: FM

• Repeat the procedures in each adjustment several times, and

the  tracking adjustments should be finally done by the trimmer
capacitors.

• Remove FM antenna in FM adjustment.

AM/MW RF signal 

generator

30% amplitude
modulation by
400 Hz signal
Output level: 
as low as possible

Put the loop
antenna close to 
the set.

+
–

level meter 

set

32 

Ω

i

 jack (J371)

FM RF signal

generator

75 kHz frequency
deviation by 1 kHz
signal
Output level: 
as low as possible

+
–

level meter 

set

32 

Ω

0.01 

µ

F

TUNER board
TP (GND)

TUNER board
TP-ANT(JW2)

i

 jack (J371)

digital voltmeter 

TP (CV)

TP (GND)

100 k

Ω

TUNER board

Adjust for a maximum reading on level meter

T1

450 kHz

Adjustment Part

Frequency Display

Reading on Digital Voltmeter

L4

530 kHz

1.0 

±

 0.05 V

Confirmation

1,710 kHz

5.3 

±

 0.7 V

Adjustment Part

Frequency Display

Reading on Digital Voltmeter

L4

531 kHz

1.0 

±

 0.05 V

Confirmation

1,611 kHz

4.8 

±

 0.7 V

Adjust for a maximum reading on level meter

L3

620 kHz

CT3

1,400 kHz

Adjust for a maximum reading on level meter

L3

621 kHz

CT3

1,404 kHz

Adjust for a minimum reading on level meter

T2

10.7 MHz

Adjustment Part

Frequency Display

Reading on Digital Voltmeter

L2

108 MHz

3.0 

±

 0.2 V

Confirmation

87.5 MHz

1.3 

±

 0.3 V

Adjust for a maximum reading on level meter

L1

87.5 MHz

CT1

108 MHz

MX

: Mexican model.

Adjustment and Connecting Location:
TUNER board (See page 15)

15

L3
AM TRACKING ADJUSTMENT

CT1
FM FREQUENCY
COVERAGE
ADJUSTMENT

L2
FM FREQUENCY
COVERAGE
ADJUSTMENT

L4
AM FREQUENCY COVERAGE
ADJUSTMENT

CT3
AM TRACKING 
ADJUSTMENT

TP-ANT
(JW2)

IC1

– TUNER BOARD (Component Side) –

TP

(GND)

TP

(CV)

TP-ANT

JW2

– TUNER BOARD (Conductor Side) –

L1
FM TRACKNG
ADJUSTMENT

T1
AM IF
ADJUSTMENT

T2
FM IF
ADJUSTMENT

16

Use the following test disc on test mode.

• CD:

YEDS-18 (PART No. 3-702-101-01)

or

PATD-012 (PART No. 4-225-203-01)

1. CD Block is basically designed to operate without adjustment.

Therefore, check each item in order given.

2. Use YEDS-18 (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MW impedance.
4. Clean the object lens by an applicator with neutral detergent

when the signal level is low than specified value with the
following checks.

1. Connect an oscilloscope to TP106 (FE) and TP124 (VC).
2. Turn the power on.
3. Load a disc (YEDS-18) and actuate the focus search. (In

consequence of open and close the disc tray, actuate the focus
search).

4. Confirm that the oscilloscope waveform (S-curve) is

symmetrical between A and B. And confirm peak to peak level
within 1.7 

±

 0.7 Vp-p.

• Try to measure several times to make sure than the ratio of A : B

or B : A is more than 10 : 7.

• Take sweep time as long as possible and light up the brightness

to obtain best waveform.

+
–

TP106 (FE)

TP124 (VC)

oscilloscope 

BD91 board

symmetry

S-curve waveform

within 1.7 

±

0.7Vp-p

A

B

1. Connect an oscilloscope to TP123 (RFO) and TP124 (VC).
2. Turn the power on.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check if RF

signal level is correct or not.

Clear RF signal waveform means that the shape “

◊” can be clearly

distinguished at the center of the waveform.

Connecting Location: CD board

+
–

TP123 (RFO)

TP124 (VC)

oscilloscope 

BD91 board

RFMON signal waveform

VOLT/DIV: 200 mV
TIME/DIV: 500 ns

level: 1.3 

±

 0.3 Vp-p 

IC401

– BD91 Board (SIDE B) –

TP124

(VC)

TP123

(RFO)

TP106

(FE)

IC101

1

1

14

15

28

25

26

50

51

75

76

100