CMT-GP6V, HCD-GP6V - Sony Audio Service Manual (repair manual). Page 16

16

Procedure:
1.

Mode : Playback

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.

test tape
P-4-A100
(10kHz, –10dB)

MAIN board
J203
speaker terminal

level meter

set

+

–

L-CH
peak

R-CH
peak

screw
position

output
level

within
1 dB

L-CH
peak

R-CH
peak

screw
position

within 1dB

P-4-A100

WS-48B

10 kHz, –10 dB

3 kHz, 0 dB

Azimuth Adjustment

Tape Speed Adjustment

1.

Demagnetize the record/playback head with a head demagnetizer.

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
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 otherwise
specified.

4.

After the adjustments, apply suitable locking compound to the
parts adjusted.

Adjustment Location: Record/Playback/Erase Head

Procedure:
1.

Turn the power on.

2.

Insert the WS-48B into deck.

3.

Press the  Y  button of deck.

4.

Check the reading of frequency counter becomes 3000 ± 90 Hz.

W.RMS (JIS) less than 0.3%
(test tape: WS-48B)

3.

Mode: Playback

test tape
P-4-A100
(10kHz, –10dB)

oscilloscope

set

Waveform of oscilloscope

in phase

45

°

90

°

135

°

180

°

good

wrong

MAIN board
J203
speaker terminal

L

R