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– 17 –

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

swab:

record/playback heads

pinch rollers

erase head

rubber belts

capstan

idlers

2. Demagnetize the record/playback head with a head demagne-

tizer.

3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the

parts adjusted.

5. The adjustments should be performed with the rated power

supply voltage unless otherwise noted.

• Torque Measurement
• Tape Tension Measurement

Mode

Torque Meter

Meter Reading

Forward

CQ-102C

36 to 61g•cm

(0.50 – 0.84 oz•inch)

Forward

CQ-102C

2 to 6g•cm

Back Tension

(0.026 – 0.082 oz•inch)

Reverse

CQ-102RC

36 to 61g•cm

(0.50 – 0.84 oz•inch)

Reverse

CQ-102RC

2 to 6g•cm

Back Tension

(0.026 – 0.082 oz•inch)

FF, REW

CQ-201B

61 to 143g•cm

(0.85 – 1.98 oz•inch)

Mode

Tension Meter

Meter Reading

Forward

CQ-403A

more than 100 g (3.52 oz)

Reverse

CQ-403R

more than 100 g (3.52 oz)

0 dB=0.775 V

1. Demagnetize the record/playback head with a head demagne-

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

2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the

parts adjust.

4. The adjustments should be performed with the rated power

supply voltage unless otherwise noted.

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

this service manual.  (As a general rule, playback circuit ad-
justment should be completed before performing recording
circuit adjustment.)

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

ch.

7. Switches and controls should be set as follows unless other-

wise specified.

8. Set to test mode.  (Press key switch same time

[SPECTRUM ANALYZER]

 

[ENTER]

  and  

[EFFECT]

  but-

ton.)

Tape

Signal

Used for

P-4-A100

10 kHz, –10 dB

Azimuth Adjustment

WS-48B

3 kHz, 0 dB

Tape Speed Adjustment

P-4-L300

315 Hz, 0 dB

Level Adjustment

 Perform this adjustments for both decks

set

main board
CN207
Pin 

3

 (L-CH)

Pin 

1

 (R-CH)

main board
CN207
Pin 

2

 

+
–

level meter

test tape
P-4-A100
(10 kHz, –10 dB)

– 18 –

1. Mode:  Playback (FWD)
2. Turn the adjustment screw and check output peaks.  If the peaks

do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.

3. Mode: Playback (FWD)

4. Repeat steps 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the

pats adjusted.

Adjustment Location: Record/Playback Head (Deck A and B)

and MAIN board.

Screw
position

L-CH
peak

within
1dB

output
level

L-CH
peak

R-CH
peak

within
1dB

Screw
position

R-CH
peak

main
board
CN207
set

test tape
P-4-A100
(10 kHz, –10 dB)

pin 

1

oscilloscope

L-CH

R-CH

V

H

waveform of oscilloscope

in phase 45 

°

90 

°

135 

°

180 

°

good

wrong

pin 

2

pin 

3

L

R

reverse

forward

Start the Tape Speed adjustment as below after setting to the test
mode.
In the test mode, the tape speed is high during pressing the

[H. SPEED DUBB]

 button.

Procedure:
1. Turn the power switch on.
2. Press the 

[SPECTRUM ANALYZER]

 button, 

[ENTER]

 but-

ton and 

[EFFECT]

 button simultaneously.

To exit from the test mode, press the

u

button.

Mode: Playback (FWD)

1. Insert the WS-48B into the deck A and the blank tape into the

deck B.

2. Press the 

[REC]

 button and

· button on the deck B.  Then

the deck B is at recording mode.

3. Set the deck A to playback mode.
4. Keep pressing the 

[H. SPEED DUBB]

 button in playback mode.

Then at HIGH speed mode.

5. Adjust RV652 on the AUDIO board do that frequency counter

reads 6,000 ± 60 Hz.

6. Take off the 

[H. SPEED DUBB]

 button.

Then at NORMAL speed mode.

7. Adjust RV651 on the AUDIO  board so that frequency counter

reads 3,000 ± 20 Hz.

8. Frequency difference between deck  A and deck B the begin-

ning of the tape should be within ± 1.5%.

Adjustment Location: AUDIO and MAIN boards

Sample Value of Wow and flutter: 0.29% or less W. RMS

(WS-48B)

Procedure:
Mode: Playback (FWD)

Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301
(L-CH) and RV401 (R-CH) so that adjustment within adjustment
level as follows.
Adjustment Level:

CN207 PB level: 301.5 to 338.3 mV (–8.2 to  –7.2 dB) level
difference between the channels: within ± 0.5 dB

Adjustment Location:  AUDIO and MAIN boards

+
–

set

test tape
WS-48B 
(3 kHz, 0 dB)

MAIN board
CN207 (Pin 

3

 : L-CH)

     (Pin 

1

 :R-CH)

frequency counter

+
–

set

test tape
P-4-L300
(315 Hz, 0 dB)

main board
CN207 (Pin 

3

: L-CH)

(Pin 

1

: R-CH)

level meter

– 19 –

Procedure:
1. Mode: Record

2. Mode:  Playback

Confirm playback the signal recorded in step 1 become adjustable
limits as follows.
If these levels do not adjustable limits, adjustment the RV341 (L-
CH) and RV441 (R-CH) on the AUDIO board to repeat steps 1
and 2.
Adjustable limits: Playback output of 315 Hz to playback output

of 10 kHz: 0 ± 0.5 dB

Adjustment Location: AUDIO and MAIN boards

Procedure:
1. Mode: Record

2. Mode: Playback

Confirm playback the signal recorded in step 1 become adjustable
limits as follows.
If these levels do not adjustable limits, adjustment the RV1501
(L-CH) and RV1551 (R-CH) on the MAIN board to repeat steps 1
and 2.
Adjustable limits:

CN207 PB level: 36.7 to 41.1 mV (–26.5 to –25.5 dB)

Adjustment Location:  MAIN board

attenuator

set

Pin 

6

 (L-CH) of IC1501 on the MAIN board.

Pin 

#¶

 (R-CH) of IC1501 on the MAIN board.

1) 315 Hz
2) 10 kHz

50 mV (–23.8 dB)







Pin 

2

 (GND) of CN207 on the MAIN 

board.

600 

Ω

blank tape
CN-123

AF OSC

+
–

set

recorded
portion

CN207 (Pin 

3

: L-CH)

(Pin 

1

: R-CH)

level meter

set

Pin 

6

  (L-CH) of IC1501 on the MAIN board.

Pin 

#¶

  (R-CH) of IC1501 on the MAIN board.

315 Hz, 50 mV (–23.8 dB)

blank tape
CS-123

Pin 

2

  (GND) of CN207 on the MAIN board.

600 

Ω

attenuator

AF OSC

+
–

set

recorded
portion

CN207 (Pin 

3

: L-CH)

(Pin 

1

: R-CH)

level meter

[MAIN  BOARD] (Component Side)

[AUDIO  BOARD] (Conductor Side)

* As the adjustment parts is mounted on the component side, ad-

just it through a hole in the AUDIO board form conductor side.
(Except RV431, 441)

CN207

CN205

RECORD
LEVEL

IC1501

RV1501

RV1551

3

1

RV651

RV311 L

RV411 R

RV652

(NORMAL) (HIGH)

TAPE SPEED

PB
LEVEL

– DECK A –

– DECK B –

        







RECORD
BIAS CURRENT

RV341

RV441

RV301

RV401

L

R

PB LEVEL

R L

  











– 20 –

1.

CD Block is basically designed to operate without adjustment.  There-
fore, check each item in order given.

2.

Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3.

Use an oscilloscope with more than 10M  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.

Procedure:
1. Connect oscilloscope to test point TP (RF). (GND terminal:

VC)

2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that the shape “≈” can be clearly distinguished at the

center of the waveform and check the RF signal level.

BD board

TP (FEO)
TP (VC)

+
–

oscilloscope

Procedure:
1. Connect oscilloscope to test point TP (FEO).
2. Connect between test point TP (FOK) and GND by lead wire.
3. Turn Power switch on.
4.  Put disc (YEDS-18) in and turned Power switch on again and

actuate the focus search.  (actuate the focus search when disc
table is moving in and out.)

5. Check the oscilloscope waveform (S-curve) is symmetrical

between A and B.  And confirm peak to peak level within
3 ± 1 Vp-p.

6. After check, remove the lead wire connected in step 2.

• 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.

Procedure:
1. Connect oscilloscope to test point TP (TEO) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Confirm that oscilloscope waveform is clear and check 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.

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

level:
1.3 

±

 0.3 Vp-p

BD board

TP (FEO)
TP (VC)

+
–

oscilloscope

S-curve waveform

BD board

TP (RF)
TP (VC)

+
–

oscilloscope

A

B

symmetry

within 3 

±

 1 Vp-p

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

level:
1.3 

±

 0.3 Vp-p