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9

2

Install the drive gear with gear
position as shown in figure.

gear

front side

1

Install the control cam
with gear position as shown
in figure.

gear

front side

3

screw
(PTPWH2.6 

×

 16)

5

two screws
(PTPWH2.6 

×

 7)

4

sub chassis

 Follow the assembly procedure in the numerical order given.

10

Procedure:
1. Set to standby state.
2. Press three buttons of

p (TAPE), p  (CD), and 

[MD/VIDEO]

simultaneously.

3. Liquid crystal display are all turned on.
4. To release from this mode, press the

1/

u

button to turn the

power OFF.

This mode can be used for operation check of tape deck section.

Procedure:
1. Set a tape in the tape deck.
2. Set to standby state.
3. Press three buttons of

p (TAPE), p (CD), and 

[TAPE]

 si-

multaneously.

4. The aging is executed in bellow sequence.
5. To release from the aging mode, press the

1/u button to turn

the power OFF.

This mode can be used for operation check of CD section.

Procedure:
1. Load a CD disc.
2. Set to standby state.
3. Press three buttons of

p (TAPE), p (CD), and 

[TUNER]

simultaneously.

4. The aging is executed in bellow sequence.
5. To release from the aging mode, press the

1/

u

button to turn

the power OFF.

Start

REC pause for 3 seconds

FWD REC

Fast forward

REV Play

REC pause for 3 seconds

REV REC

Rewind

FWD Play

Shut off

Shut off

Shut off

Shut off

1 minute

3 minutes

1 minute

3 minutes

Start

Open the disc tray

Close the disc tray

Play the last track

11

Confirm each contents of this section first of all. If the results are
not satisfied, do the adjustment.

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 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.

• Test Tape

Procedure:
1. Mode:  Playback

0 dB=0.775 V

Tape

Signal

Used for

P-4-A100

10 kHz, –10 dB

Azimuth Adjustment

P-4-L300

315 Hz, 0 dB

Level Adjustment

set

MAIN board
LINE OUT jack (PJ301)
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

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

pats adjusted.

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
LINE OUT jack (PJ301)
L-CH

set

forward

reverse

12

Procedure:
Mode: Playback

Confirm playback level is within specification values as follows.
If these levels are out of specification values, adjust the RV151
(L-CH) and RV251 (R-CH) on the MAIN board so that the level
meter reading become within specified value.

Specified value:
PJ301 PB level:  301.5 to 338.3 mV (–8.2 to  –7.2 dB) level differ-
ence between the channels:  within ±0.5 dB

Adjustment Location:  MAIN board

Procedure:
1. Mode:  Record

2. Mode:  Playback

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

fied value as follows.
If these values are out of specification values, adjust the RV153
(L-CH) and RV253 (R-CH) on the MAIN board to repeat steps
1and 2.

Specified value: Playback output of 315 Hz to playback output

of 10 kHz: ± 0.5 dB

Adjustment Location:  MAIN board

+
–

set

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

MAIN board
LINE OUT jack (PJ301)
L-CH, R-CH

level meter

Procedure:
1. Mode:  Record

2. Mode:  Playback

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

fied value as follows.
If these values are out of specification values, adjust the RV252
(R-CH) and RV152 (L-CH) on the MAIN board to repeat steps
1 and 2.

Specified value:
PJ301 PB level:  47.2 to 53.0 mV (– 24.3 to – 23.3 dB)

Adjustment Location:  MAIN board

attenuator

set

MAIN board 
MD IN jack (PJ301)
L-CH, R-CH

1) 315 Hz
2) 10 kHz

50 mV (–23.8 dB)







600 

Ω

blank tape
CN-123

AF OSC

+
–

set

recorded
portion

MAIN board
LINE OUT jack (PJ301)
L-CH, R-CH

level meter

set

MAIN board
MD IN jack (PJ301)
L-CH, R-CH
315 Hz, 50 mV (–23.8 dB)

blank tape
CS-123

600 

Ω

attenuator

AF OSC

+
–

set

recorded
portion

MAIN board
LINE OUT jack (PJ301)
L-CH, R-CH

level meter

PJ301

Playback Level

REC Bias

REC Level

RV252 (R)

IC352

LINE OUT (L/R)

MD IN (L/R)

VIDEO IN (L/R)

RV152 (L)

RV251 (R)
RV151 (L)

RV253 (R)
RV153 (L)