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25

0 dB=0.775 V

1. Demagnetize the record/playback head with a head

demagnetizer.

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 adjustment
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 otherwise

specified.

• Test Tape

  Perform this adjustments for both decks

Procedure:
1. Mode:  Playback

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

demagnetizer.

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.

set

SP RELAY board
CN804
Pin 

2

 (L-CH)

Pin 

5

 (R-CH)

SP RELAY board
CN804
Pin 

3

 (GND)

+
–

level meter

test tape
P-4-A100
(10 kHz, –10 dB)

3.06 N • m to 6.96 N • m

31 to 71 g • cm

(0.43 – 0.98 oz • inch)

0.19 N • m to 0.58 N • m

2 to 6 g • cm

(0.02 – 0.08 oz • inch)

3.06 N • m to 6.96 N • m

31 to 71 g • cm

(0.43 – 0.98 oz • inch)

0.19 N • m to 0.58 N • m

2 to 6 g • cm

(0.02 – 0.08 oz • inch)

6.96 N • m to 14.02 N • m

71 to 143 g • cm

(0.98 – 1.99 oz • inch)

9.80 N • m

100 g or more

(3.53 oz or more)

9.80 N • m

100 g or more

(3.53 oz or more)

CQ-102C

CQ-102C

CQ-102RC

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

FWD

FWD

back tension

REV

REV

back tension

FF/REW

FWD tension

REV tension

P-4-A100

10 kHz, –10 dB

Azimuth Adjustment

WS-48B

3 kHz, 0 dB

Tape Speed Adjustment

26

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

4. After the adjustments, apply suitable locking compound to the

pats adjusted.

Adjustment Location: Playback Head (Deck A).

Record/Playback/Erase Head (Deck B).

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

[CD SYNC HI-DUB] 

button.

Procedure:
1. Press

?/1

button to turn the set ON.

2. Press three buttons

x

, 

[DISPLAY]

 and 

[CD SYNC HI-DUB]

simultaneously.
To release from the test mode, press the

?/1

button.

Mode:  Playback

1. Insert the WS-48B into the deck B.
2. Press the hH button on the deck B.
3. Press the 

[CD SYNC HI-DUB]

 button in playback mode.

Then at HIGH speed mode.

4. Adjust RV1001 on the SW board so that frequency counter reads

6,000 

± 180 Hz.

5. Press the 

[CD SYNC HI-DUB]

 button.

Then back to NORMAL speed mode.

6. Adjust RV1002 on the SW board so that frequency counter reads

3,000 

± 90 Hz.

Adjustment Location: SW board

Sample Value of Wow and Flutter: 0.3% or less W. RMS (JIS)

(WS-48B)

Screw
position

L-CH
peak

within
1dB

Output
level

L-CH
peak

R-CH
peak

within
1dB

Screw
position

R-CH
peak

SP
REALY
baord
CN804
set

test tape
P-4-A100
(10 kHz, –10 dB)

pin 

5

oscilloscope

L-CH

R-CH

V

H

waveform of oscilloscope

in phase 45

°

90

°

135

°

180

°

good

wrong

pin 

3

pin 

2

L

R

+
–

set

test tape
WS-48B 
(3 kHz, 0 dB)

SP RELAY board
CN804 Pin 

3

 (GND)

SP RELAY board
CN804
Pin 

2

 (L-CH)

Pin 

5

 (R-CH)

frequency counter

forward

reverse

27

4. Mode:  Record

5. Mode:  Playback

6. Confirm the play back signal recorded in step 3 becomes

adjustable level as follows.
If these levels are not adjustable level, adjust the RV53 (R-CH)
on the SP RELAY board to repeat steps 4 and 5.

Adjustable level:
CN804 PB level:  47.2 to 53.0 mV (–24.3 to –23.3 dB)
Adjustment Location:  SP RELAY board

Procedure:
In the MC test mode, the “REC memory mode” is convenient for
this adjustment. In the “REC memory mode” , when the REC starts
the input signal FUNCTION is switched to VIDEO automatically.
When the REC stops, the tape returns near to the recording start
position.

1. Press 

[MD $VIDEO%]

 button to select VIDEO. (This step is not

necessary if the above test mode has already been set)

2. Insert a tape into deck B.
3. After press 

[REC PAUSE/START]

 button, press 

[REC PAUSE/

START]

 button, then recording start.

4. Mode:  Record

5. Mode:  Playback

6. Confirm the playback signal recorded in step 3 becomes

adjustable level as follows.
If these levels are not adjustable level, adjust the RV2 (L-CH)
and RV52 (R-CH) on the SP RELAY board to repeat steps 4
and 5.

Adjustable level: Playback output of 315 Hz to playback output

of 10 kHz:  

±1.0 dB

Adjustment Location:  SP RELAY board

Procedure:
In the MC test mode, the “REC memory mode” is convenient for
this adjustment. In the “REC memory mode” , when the REC starts
the input signal FUNCTION is switched to VIDEO automatically.
When the REC stops, the tape returns near to the recording start
position.

1. Press 

[MD $VIDEO%]

 button to select VIDEO. (This step is not

necessary if the above test mode has already been set)

2. Insert a tape into deck B.
3. After press 

[REC PAUSE/START]

 button, press 

[REC PAUSE/

START]

 button, then recording start.

attenuator

set

DSP board
MD (AUDIO) (J701)

1) 315 Hz
2) 10 kHz

50 mV (–23.8 dB)







600 

Ω

blank tape
CN-123

AF OSC

+
–

set

recorded
portion

SP RELAY board
CN804 Pin 

3

 (GND)

SP RELAY board
CN804
Pin 

2

 (L-CH)

Pin 

5

 (R-CH)

level meter

set

DSP board
MD (VIDEO) (J701) 
315 Hz, 50 mV (–23.8 dB)

blank tape
CS-123

600 

Ω

attenuator

AF OSC

+
–

set

recorded
portion

SP RELAY board
CN804 Pin 

3

 (GND)

SP RELAY board
CN804
Pin 

5

 (R-CH)

level meter

TAPE SPEED

ADJUSTMENT

RV1002

RV1001

(NORMAL)  (HIGH)

CN1001





















– SW BOARD (Component Side) –

CN804

10

1

– SP RELAY BOARD (Conductor Side) –

REC BIAS

ADJUSTMENT

REC LEVEL

ADJUSTMENT

(L-CH)

(R-CH)

RV52 RV2

RV53















28

1.

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

2.

Use LUV-P01 (4-999-032-01) unless otherwise indicated.

3.

Use an oscilloscope with more than 10M

Ω 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 an oscilloscope to TP (FEO).
2. Connect between TP (FEI) and TP (DVC) ( 1.65 V) by lead

wire.

3. Turn the power ON.
4. Load a disc (LUV-P01) and actuate the focus search. (In

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

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

symmetrical between A and B. And confirm peak to peak level
within 2 

± 0.5 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 an oscilloscope CH1 to TP (RFDC) and CH2 to TP

(RFAC).

2. Turn the power ON.
3. Load a disc (LUV-P01) and playback.
4. Confirm that oscilloscope waveform is clear and check if RF

signal level is correct or not.

BD board

Oscilloscope

TP(FEO)
TP(DVC)

symmetry

S-curve waveform

within 2 

±

0.5Vp-p

A

B

TP(RFDC)

TP(RFAC)

BD board

oscilloscope

TP(DVC)

Clear RF signal waveform means that the shape “ 

◊ ”  can be clearly

distinguished at the center of the waveform.

Procedure :
1. Connect an oscilloscope to TP (TEO) and TP (DVC).
2. Turn the power ON.
3. Load a disc (LUV-P01) and playback the number nine track.
4. Press the hH button. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope

waveform.

6. Adjust RV101 on the BD board so that the center of waveform

becomes the same voltage of DVC. (i.e.  A=0V)

Connecting and Adjustment Location: BD board

RF signal waveform

VOLT/DIV : 200mV
TIME/DIV : 500ns

level : 0.65 

±

0.15Vp-p (RFDC)

1.1 

±

0.4Vp-p (RFAC)

TP(TEO)
TP(DVC)

BD board

oscilloscope

level=1.0 

±

0.5Vp-p

symmetry

A (DC voltage)

center of
waveform

B

DVC

1 track jump waveform