CHC-P33D, HCD-H33D - Sony Audio Service Manual (repair manual). Page 12

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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