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10

1

two screws
(P2 

×

 2.5)

4

DC motor (capstan/reel)
(M901)

3

sub belt (C)

2

main belt

Note : When installing motor, 

adjust the screw and
screw hole of motor.

1

main belt

4

sub belt (c)

2

screw
(PTP2 

×

 3)

A

2

screw
(PTP2 

×

 3)

2

screw
(PTP2 

×

 3)

2

screw
(PTP2 

×

 3)

3

Lift up the bottom BKT (TS)
in the direction of arrow 

A

(as far as the belt can be removed).

11

2

screw
(PTT2 

×

 4)

1

screw
(P2 

×

 3)

3

FF/REV lever section

9

screw
(P2 

×

 4)

5

screw
(PTP2 

×

 3)

qd

Remove three magnetic 
head lead wires from 
the adjuster arm blue.

magnetic head 
(HP901)

magnetic head lead wire

adjuster arm blue

• MAGNETIC HEAD LEAD WIRE COLOR INDICATION

ON HEAD (HP901) AND SLIDE SW BOARD.

0

SPG support plate

7

PSW (reel) B

8

HP roller (A)

qa

adjuster arm SPG (A)

qs

adjuster arm SPG (B)

qf

magnetic head (play back) 
(HP901)

6

slide SW board

4

Remove the three solders
of magnetic head lead wires.

yellow lead wire

black lead wire

red lead wire

slide SW board

12

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: PB head (See page 13)

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

13

frequency counter

test tape 
WS-48A
(3 kHz, 0 dB)

set

speaker out terminal

–

+

4 

Ω

FWD 

REV 







adjustment 
screws

– Set Upper View –

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

Adjustment Location: DC motor

Tuner section adjustments are done automatically in this set.

Adjustment Location: PB head

Adjustment Location: DC motor

– Set Upper View –

Tape Speed Adjustment