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13

2

1

two precision screws
(P2 

×

 2)

Note: Mount the motor so that the 

angle between      of the 
motor and the hole for the 
screw      becomes 30

°

 as

shown in this figure.

capstan/reel motor
(M901)

30˚

14

Mode

Tension Meter

Meter Reading

Forward

CQ-403A

more than 5.89 mN•m

(more than 60 g)

Reverse

CQ-403R

(more than 2.12 oz)

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

swab:

playback head

pinch roller

rubber belt

capstan

idler

2. Demagnetize the playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the power supply

voltage (14.4 V) unless otherwise noted.

With this set, it is not necessary to apply suitable locking
compound to the parts after the azimuth adjustment.

Mode

Torque Meter

Meter Reading

2.46 – 5.39 mN•m

Forward

CQ-102C

(25 – 55 g•cm)

(0.35 – 0.76 oz•inch)

Forward

0.15 – 0.39 mN•m

CQ-102C

(1.5 – 4 g•cm)

Back Tension

(0.02 – 0.06 oz•inch)

2.46 – 5.39 mN•m

Reverse

CQ-102RC

(25 – 55 g•cm)

(0.35 – 0.76 oz•inch)

Reverse

0.15– 0.39 mN•m

CQ-102RC

(1.5 –

4 g•cm)

Back Tension

(0.02 – 0.06 oz•inch)

4.91 – 14.70 mN•m

FF, REW

CQ-201B

(50 – 150 g•cm)

(0.69 – 2.08 oz•inch)

0 dB= 0.775 V

1. The adjustments should be performed in the order given in

this service manual.

2. The adjustments should be performed for both L-CH and

R-CH.

Procedure:
1. Put the set into the FWD PB mode.

2. Turn the screw and check the output peak value.  Adjust the

screw so that the peak value in channels L and R coincides
within 3 dB.

3. Check the phase in the FWD PB mode.

4. Repeat the above adjustment for the REV PB mode.
5. Check that output level difference between FWD PB mode

and REV PB mode is within 4 dB.

Adjustment Location: See page 15

Type

 Signal

 Used for

P-4-A063

6.3 kHz, –10 dB

head azimuth adjustment

WS-48A

3 kHz, 0 dB

tape speed adjustment

level 

meter

test tape 
P-4-A063
(6.3 kHz, –10 dB)

set

speaker out terminal

4 

Ω

+
–

screw
position

L-CH
peak

within
3 dB

output
level

L-CH
peak

R-CH
peak

within
3 dB

angle

R-CH
peak

test tape 
P-4-A063
(6.3 kHz, –10 dB)

L-CH

R-CH

speaker out terminal

oscilloscope

V

H

+ +

–

–

Screen pattern

in phase

good

wrong

45 

°

90 

°

135 

°

180 

°

4 

Ω

4 

Ω

set

15

frequency counter

test tape 
WS-48A
(3 kHz, 0 dB)

set

speaker out terminal

–

+

4 

Ω

PB Head Azimuth Adjustment

– Set Upper View –

Tape Speed Adjustment

Procedure:
1. Put the set into the FWD PB mode.
2. Adjust adjustment resistor for inside capstan motor so that the

reading on the frequency counter becomes in 3,015 Hz.

Specified Value: 2,940 to 3,090 Hz

Tuner section adjustments are done automatically in this set.

16

Note on Schematic Diagram:
• All capacitors are in 

µ

F unless otherwise noted.  (p: pF)

50 WV or less are not indicated except for electrolytics
and tantalums.

• All resistors are in 

Ω

 and 

1

/

4

 

W or less unless otherwise

specified.

•

C

: panel designation.

•

A

: B+ Line.

• Power voltage is dc 14.4V and fed with regulated dc power

supply from ACC and BATT cords.

• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.
no mark : FM
[

] : TAPE PLAYBACK

• Voltages are taken with a VOM (Input impedance 10 M

Ω

).

Voltage variations may be noted due to normal produc-
tion tolerances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal produc-
tion tolerances.

• Circled numbers refer to waveforms.

• Signal path.

F

: FM

E

: TAPE PLAYBACK

L

: BUS AUDIO IN

• Abbreviation

CH

: Chinese model

EA

: Saudi Arabia model

IND

: Indian model

Note on Printed Wiring Board:
•

X

: parts extracted from the component side.

•

Y

: parts extracted from the conductor side.

•

: Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

Caution:
Pattern face side:

Parts on the pattern face side seen from

(Conductor Side)

the pattern face are indicated.

Parts face side:

Parts on the parts face side seen from

(Component Side) the parts face are indicated.

3

IC901 

uf

 (OSC)

1

IC501 

qs

 (OSCOUT)

2

IC501 

qh

 (XOUT)

4 Vp-p

54 ns

5 Vp-p

30.5 

µ

s

2.5 Vp-p

22.4 

µ

s