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13

1. Press the

u

button to enter the ALL SERVO ON mode and

display as below. (All servo ON)

2. Connect an oscilloscope to TP (RF) and TP (VC) on the CD

board.

3. Confirm the RF level of waveform satisfy specified value as

follows.

Specified value:
RF level: 1 

±

 0.3 Vp-p

1. Press the

x

button to enter the LPC OFF mode and display

as below. (LPC OFF)

2. Confirm the RF level of waveform is the same as the RF level

in “4. ALL SERVO ON mode”.
If the RF level is down from the RF level in “4. ALL SERVO
ON mode”, measure again after clean the object lens by an
applicator with lens cleaning liquid.

1. Press the

x

(CD) button to stop rotate the disc.

2. Press the

?/1

button to release the CD test mode and turn the

power OFF.

P L

*  *  *  *

STEREO

±

P L

*  *  *  *

14

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.

 Perform this adjustments for both decks

MAIN board
IC401
Pin 8 (L-CH)
Pin eg (R-CH)

MAIN board
IC401
Pin rs 

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 61 g•cm

(0.50 – 0.84 oz•inch)

Forward

CQ-102C

2 to 6 g•cm

Back Tension

(0.026 – 0.082 oz•inch)

Reverse

CQ-102RC

36 to 61 g•cm

(0.50 – 0.84 oz•inch)

Reverse

CQ-102RC

2 to 6 g•cm

Back Tension

(0.026 – 0.082 oz•inch)

FF, REW

CQ-201B

61 to 143 g•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)

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

15

Procedure:
Turn the power switch on.
Mode: Playback (FWD)

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

deck B.

2. Press the 

[HI-SPEED DUBBING]

 button and

X

button.

Then at HIGH speed dubbing.

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

reads 6,000 ± 180 Hz.

4. Press the

x

(TAPE A or B) button to stop the HIGH speed

dubbing.

5. Press the 

[REC   ]

,

X

and

Y

button.

Then at NORMAL speed dubbing.

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

reads 3,000 ± 90 Hz.

7. Press the

x

(TAPE A or B) button to stop the NORMAL speed

dubbing.

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: 0.3% or less W. RMS (JIS)

(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:

IC401 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

MAIN board
IC401(Pin 8 : L-CH)

(Pin eg : R-CH)

MAIN board
IC401 (Pin 8 : L-CH)

(Pin eg : R-CH)

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.

pin eg

°

°

°

°

pin rs

pin 8

z

16

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 RV301 (L-
CH) and RV351 (R-CH) on the MAIN board to repeat steps 1 and
2.
Adjustable limits:

IC401 PB level: 36.7 to 41.1 mV (–26.5 to –25.5 dB)

Adjustment Location:  MAIN board

Pin 6 (L-CH) of IC401 on the MAIN board.
Pin ej (R-CH) of IC401 on the MAIN board.
1) 315 Hz
2) 10 kHz







Pin rs (GND) of IC401 on the MAIN 
board.

Ω

IC401 (Pin 8 : L-CH)

(Pin eg : R-CH)

Pin 6  (L-CH) of IC401 on the MAIN board.
Pin ej  (R-CH) of IC401 on the MAIN board.
315 Hz, 50 mV (–23.8 dB)

Pin rs  (GND) of IC401 on the MAIN board.

Ω

IC401 (Pin 8 : L-CH)

(Pin eg : R-CH)

* 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)

        







  









