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— 29 —

1

Five connectors

2

Connector (2P)

3

Two screws
(BVTP3x8)

4

Two screws
(BVTP3x8)

5

CD board

6

Screw (BVTP3x8)

7

Three CDM screws

8

Four CDM screws

9

CD mechanism deck

CN101

CN102

CN103

CN104

CN105

1

Flat type wire
(7 CORE)

3

Two screws (BVTP3x8)

4

TC board

2

Two screws (BVTP3x8)

5

Two screws
(BVTP2.6x8)

6

TC mechanism deck

— 30 —

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 sup-

ply voltage unless otherwise noted.

1 to 5 g • cm

(0.014 - 0.069 oz • inch)

65 to 90 g • cm

(0.91 - 1.25 oz • inch)

110 g or more

(3.88 oz or more)

110 g or more

(3.88 oz or more)

FWD

FWD
back tension

REV

REV
back tension

FF/REW

FWD tension

REV tension

CQ-102C

CQ-102C

CQ-102RC

CQ-102RC

CQ-201B

CQ-403A

CQ-403R

30 to 60 g • cm

(0.42 - 0.83 oz • inch)

1 to 5 g • cm

(0.014 - 0.069 oz • inch)

30 to 60 g • cm

(0.42 - 0.83 oz • inch)

Torque

Torque meter

Meter reading

1. Demagnetize the record/playback head with a head damagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the

parts adjusted.

4. The adjustments should be performed with the rated power sup-

ply 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 adjust-
ment.)

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.

DOLBY NR switch: OFF
DIRECTION switch: 

D

FUNCTION switch: TAPE

Signal

Used for

10 kHz, –10 dB

3 kHz, 0 dB

315 Hz, 0 dB

Azimuth Adjustment

Tape Speed Adjustment

Level Adjustment

Tape

P-4-A100

WS-48B

P-4-L300

Perform the tape deck adjustment after setting the test mode.
0 The sections where recording is started are memorized. When
the 0 button is pressed after recording, the tape is rewound to the
section where recording was started, and stops.

In this mode, the input source can be selected using the FUNCTION
button. To playback the recorded tape, select the TAPE using the
FUNCTION button.
To play back the tape, select TAPE using the FUNCTION button.
To exit the mode disconnect the AC plug from the outlet.

Method:
In the STANDBY state, press the DOLBY NR button,
p button, and DISC 4 button together.

 

Perform this adjustments for both decks.

Procedure:
1. Mode : Playback

+

VIDEO 1 OUT

test tape
P-4-A100
(10kHz, –10dB)

level meter

set

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 1 dB of peak.

R-CH
peak

screw
position

within
1dB

within 1dB

L-CH
peak

screw
position

R-CH
peak

output
level

L-CH
peak

— 31 —

Procedure :
Mode: Playback

frequency counter

test tape WS-48B
(3kHz, 0dB)

set

VIDEO 1 OUT

1. Set to the playback mode.
2. Adjust the RV71 on the AUDIO board so that the frequency

counter reading becomes 3,000 ± 10 Hz.

Adjustment Location: AUDIO board

Procedure:
Mode: Playback

Adjust the RV11 (L-CH) and RV21 (R-CH) to satisfy the following
adjustment level.

VIDEO 1 OUT level: 294.6 to 330.6 mV (–8.4 to –7.4 dB)
level difference between the channels: within ± 0.5 dB
Confirm that the VIDEO 1 OUT  Level does not change when
playback and stop are repeated.

Adjustment Location: AUDIO board

set

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

VIDEO 1 OUT

3. Mode: Playback

4. Change the reverse playback mode and repeat the steps 1 to 3.
5. After the adjustments, apply suitable locking compound to the

parts adjusted.

Adjustment Location: Record/Playback/Erase Head

Waveform of oscilloscope

4 5 ˚

9 0 ˚

135˚

180˚

wrong

good

in phase

L

oscilloscope

test tape
P-4-A100
(10kHz, –10dB)

R

VIDEO 1 OUT L

H

V

Forward side

Reverse side

Adjustment screw

When adjusting the azimuth, remove the Lid (TC) from the control
panel assembly in advance.

set

VIDEO 1 OUT R

level meter

— 32 —

Adjustment Location
[AUDIO BOARD] (Conductor Side)

Procedure:
1. Mode: record

2. Mode: Playback

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

ment level as follows.
If these levels do not adjustment level, adjust the RV12 (L-CH)
and RV22 (R-CH) on the AUDIO board to repeat steps 1 and 2.

Adjustment level: The playback output of 10 kHz level difference

against 315 Hz reference should be ± 0.5 dB.

Adjustment Location: AUDIO board

Procedure:
1. Mode: record

AF OSC

blank tape
CS-123

set

600

Ω

VIDEO 1 IN
1) 315Hz
2) 10kHz

} 54.9 mV (–23 dB)

VIDEO 1 OUT

attenuator

600

Ω

set

AF OSC

blank tape
CS-123

attenuator

2. Mode: Playback

VIDEO 1 OUT

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

ment level as follows.
If these levels do not adjustment level, adjust the RV203 (L-CH)
and RV204 (R-CH) on the TC board to repeat steps 1 and 2.

VIDEO 1 OUT level: 46.2 to 51.8 mV (–24.5 to –23.5 dB)

Adjustment Location: TC board

[TC BOARD] (Component Side)

CN201

CN202

CN203

CN204

IC203

RV203
Record Level (L-CH)

RV204
Record Level(R-CH)

RV71
Tape Speed

RV21 (R-CH)

RV11 (L-CH)

RV22
(R-CH)

RV12
(L-CH)

Record Bias

Playback
Level

recorded
position

level meter

set

level meter

recorded
portion

set

VIDEO 1 IN
315Hz 54.9 mV (–23 dB)