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17

Mode

Torque Meter

Meter Reading

2.9~6.9 mN•m

FWD

(30 to 70 g•cm)

(0.42 – 0.97 oz•inch)

FWD

     CQ-102C

0.19~0.59 mN•m

back tension

 (2 to 6 g•cm)

(0.03 – 0.08 oz•inch)

7.8~16.7 mN•m

FF/REW

     CQ-201B

 (80 to 170 g•cm)

(1.11 – 2.36 oz • inch)

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 sup-

ply voltage unless otherwise noted.

   DECK SECTION     0 dB = 0.775 V

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

tizer.

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 other-

wise specified.

8. Set to the DOLBY NR OFF.
9. Set to the test mode.

(1) Press the  \/1  button to turn the power ON.
(2) Select the function “TAPE A or B”.
(3) Press the button of  c/CLOCK SET  ,  TUNER ENTER ,

and  DISC 3  simultaneously, to set the tape deck test mode
and displays “TEST MODE” on the fluorescent indicator
tube.

(4) To release from the test mode, press the  \/1  button.

• Test Tape

Tape

Signal

Used for

P-4-A100

10 kHz, – 10 dB

Azimuth Adjustment

WS-48B

3 kHz, 0 dB

Tape Speed Adjustment

18

 Perform this adjustments for both decks

Procedure:
1. Mode: Playback (FWD)

set

MAIN board
MD (VIDEO) OUT jack (J701)
L-CH, R-CH

+

level meter

test tape
P-4-A100
(10 kHz, – 10 dB)

Screw
position

L-CH
peak

within
1dB

Output
level

L-CH
peak

R-CH
peak

within
1dB

Screw
position

R-CH
peak

3. Mode: Playback

set

test tape
P-4-A100
(10 kHz, – 10 dB)

R-CH

oscilloscope

L-CH

R-CH

V

H

waveform of oscilloscope

in phase 45

°

90

°

135

°

180

°

good

wrong

MAIN board
MD (VIDEO) OUT jack (J701)
L-CH

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

pats adjusted.

Adjustment Location: Playback Head (Deck A).

 Record/Playback/Erase Head (Deck B).

Mode: Playback

+
–

set

test tape
WS-48B 
(3 kHz, 0 dB)

MAIN board
MD (VIDEO) OUT jack (J701)
L-CH, R-CH

frequency counter

1. Insert the WS-48B into the deck B.
2. Press the  H  button on the deck B.
3. Press the  H SPEED DUB   button in playback mode.

Then at HIGH speed mode.

4. Adjust RV392 on the LEAF SW board do that frequency

counter reads 6,000 ± 180 Hz.

5. Press the  H SPEED DUB   button.

Then back to NORMAL speed mode.

6. Adjust RV391 on the LEAF SW board so that frequency

counter reads 3,000 ± 90 Hz.

Adjustment Location: MAIN board
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)

         (WS-48B)

forward

reverse

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.

19

Procedure:
1. Mode: Record

FUNCTION: VIDEO

attenuator

set

MAIN board 
MD(VIDEO) IN jack (J701)
L-CH, R-CH

1) 315 Hz
2) 10 kHz

50 mV (– 23.8 dB)







600 

Ω

blank tape
CS-123

AF OSC

2. Mode: Playback

+
–

set

recorded
portion

MAIN board
CN301 pin 

1

 (L-CH)

            pin 

3

 (R-CH)

level meter

3. Confirm playback the signal recorded in step 1 become speci-

fication values as follows.
If these values are out of specification values, adjust the RV321
(L-CH) and RV322 (R-CH) on the MAIN board to repeat
steps 1and 2.

Adjustment level: The playback output of 10kHz level difference

      against 315 Hz reference should ±0.5 dB.

Adjustment Location: MAIN board

Procedure:
1. Mode: Record

FUNCTION: VIDEO

set

MAIN board
MD (VIDEO) IN jack (J701)
L-CH, R-CH
315 Hz, 50 mV (– 23.8 dB)

blank tape
CS-123

600 

Ω

attenuator

AF OSC

2. Mode: Playback

+
–

set

recorded
portion

MAIN board
CN301 pin 

1

 (L-CH)

            pin 

3

 (R-CH)

level meter

3. Confirm playback the signal recorded in step 1 become speci-

fication values as follows.
If these values are out of specification values, adjust the RV351
(L-CH) and RV301 (R-CH) on the MAIN board to repeat steps
1 and 2.

Specification values:
CN301 playback level: 47.2 to 53.0 mV (– 24.3 to – 23.3 dB)

Adjustment Location: MAIN board

1

18

1

15

CN431

CN371

1

3

IN

OUT

MD (VIDEO)

CN301

IC301

IC501

RV321

REC BIAS

(L-CH)

RV351

REC LEVEL

(L-CH)

RV301

REC LEVEL

(R-CH)

RV391

TAPE SPEED

(NORMAL)

RV392

TAPE SPEED

(HIGH)

RV322

REC BIAS

(R-CH)

20

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 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.

BD board

Oscilloscope

TP(FE)
TP(DVC)

Procedure :
1. Connect oscilloscope to TP (FE).
2. Connect between TP (FE) and TP (DVC (   1.65 V) by lead

wire.

3. Press the  \/1  button to turn the power ON.
4. Load a disc (LUV-P01) and actuate the focus search. (In conse-

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

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

cal between A and B. And confirm peak to peak level within 2
±0.5 Vp-p.

symmetry

S-curve waveform

within 4 

±

1Vp-p

A

B

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.

TP(RFDC)
TP(RFAC)

BD board

oscilloscope

Procedure :
1. Connect oscilloscope to TP2 (RFDC) and TP1 (RFAC).
2. Press the  \/1  button to turn the power ON.
3. Load a disc (LUV-P01) and playback.
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 : 200mV
TIME/DIV : 500ns

level : 1.45 

±

 0.3Vp-p

TP(TE)
TP(DVC)

BD board

oscilloscope

Procedure:
1. Connect oscilloscope to TP (TE) and TP (DVC) board.
2. Press the  \/1  button to turn the power ON.
3. Load a disc (LUV-P01) and playback the number nine track.
4. Press the  bB  button. (Becomes the 1track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscillo-

scope waveform.

B=1.3 

±

 0.6Vp-p

symmetry

A (DC voltage)

center of
waveform

B

0V

Specified level:     

×

 100=less than – 22%

B

A

6. Adjust RV101 so that A (DC voltage) becomes 0.

DVC

RFAC

FE

SE

TE

RFDC

RV101