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– 9 –

1

three screws
(BVTP 2.6 

×

 8)

1

two screws
(BVTP 2.6 

×

 8)

3

tape mechanism
section

2

Open the cassette
lid ass’y.

1

two springs

2

two screws
(BVTP2.6 

×

 8)

4

bracket (FR)

5

cassette lid ass’y

3

bracket (FL)

– 10 –

3

five screws
(BVTP 2.6 

×

 8)

4

two claws

2

supplid nut

1

jog knob

4

two claws

5

PANEL board

– 11 –

1. Clean the following parts with a denatured-alcohol-moistened

swab:

record/playback head

pinch roller

erase head

rubber belts

capstan

idlers

2. Demagnetize the record/playback head with a head

 damagnetizer.

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. The adjustment should be performed in the publication.

(Be sure to make playback adjustment at first.)

2. The adjustment and measurement should be performed for both

L-CH and R-CH.

•

 Switch position

DOLBY NR switch

: OFF

TIMER switch

: OFF

DIRECTION MODE switch : 

A

3. Deck section electrical adjustment are made in test mode by

pressing TUNER/BAND, DISPLAY, and FUNCTION at the
same time.

– Record Mode –

set

MD IN

600 

Ω

attenuator

AF OSC

+
–

level meter

MD OUT

P-4-A100

10 kHz, –10 dB

Head Azimuth Adjustment

P-4-L300

315 Hz, 0 dB

Level Adjustment

WS-48B

3 kHz, 0 dB

Tape Speed Adjustment

0dB = 0.775V

DECK A

DECK B

•

When adjusting the azimuth, remove the Window (DIS) in the
center of the front panel. (Refer to page 7.)

1.

Mode : Forward Playback

Foward

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)

Forward

CQ-403A

more than 100 g (3.53 oz)

Reverse

CQ-403R

more than 100 g (3.53 oz)

•

set

+
–

test tape
P-4-A100
(10 kHz, –10 dB)

MD OUT

level meter

– 12 –

2. Turn the adjustment screw for the maximum output levels. If

these levels do not match, turn the adjustment screw until both
of output levels match together within 1dB.

Screw
position

L-CH
peak

within
1dB

output
level

L-CH
peak

R-CH
peak

within
1dB

Screw
angle

R-CH
peak

3. Mode : Forward Playback

4. Change the reverse playback mode and repeat the steps 1 to 3.
5. After the adjustment, lock the adjustment screw with suitable

locking compound.

–record/playback head (Deck A and B)

Deck A

Deck B

forward

reverse

Adjustment Screw

•

Perform high speed adjustment before normal speed adjustment.

Mode : Playback

 DECK A

 DECK B

*High

A

RV652

5,940 to 6,060 Hz

B

RV652

Normal

A

RV651

2,990 to 3,030 Hz

B

RV651

* Continuous to press HIGH SPEED DUBBING switch (S507) in

playback mode : High speed playback.

Frequency difference between the beginning and the end of the tape
should be within ± 3%.
Frequency difference between deck A and deck B the beginning of
the tape should be within 1.5%.

Adjustment Location : AUDIO board (see page 13)

Procedure :
Mode : Playback

 DECK A

 DECK B

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 :
OUTPUT level : –3.5 ± 0.5 dB (0.489 to 0.546 V)
Level Difference between Channels : within 0.5 dB

Confirm the OUTPUT level dose not change in playback mode while
changing the mode from playback to stop several times.

Adjustment Location : AUDIO board (see page 13)

set

+
–

test tape
P-4-A100
(10kHz, -10dB)

MD OUT

Oscilloscope

L-CH

R-CH

V

H

+

–

screen pattern

in phase

45

°

90

°

135

°

180

°

good

wrong

set

test tape
WS-48B
(3 kHz, 0 dB)

MD OUT

+
–

frequency counter

set

+
–

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

MD OUT

level meter