HCD-W55, MHC-W55, MHC-W77AV - Sony Audio Service Manual (repair manual). Page 6

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Forward

CQ-102C

36  to 61 g•cm

(0.50 – 0.84 oz•inch)

Forward

CQ-102C

2 to 6 g•cm

Back Tension

(0.028– 0.083 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

(0.028 – 0.083 oz•inch)

FF, REW

CQ-201B

61 to 143 g•cm

(0.85– 1.99 oz•inch)

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Forward

CQ-403A

more than 100g (3.53 oz)

Reverse

CQ-403R

more than 100g (3.53 oz)

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 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 supply

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.

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Switch position
DOLBY NR switch

: OFF

FUNCTION button

: OFF

EFECT switch

: OFF

DBFB switch

: OFF

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

pressing CD STOP, DECK A STOP, and DECK B STOP at the
same time.

4. Input point and output level measurement point.

P-4-A100

10 kHz, –10dB

Head Azimuth Adjustment

P-4-L300

315Hz, 0dB

Level Adjustment

WS-48B

3kHz, 0dB

Tape Speed Adjustment

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1. Forward Playback mode

Reverse Playback mode

R-CH

L-CH

Output level

measurement

point

SYSTEM

CONTROL 1

CN151

12

14

11

10

REC (R)

REC (L)

PB (R)

PB (L)

AF OSC

attenuator

0 dB=0.775V

test tape
P-4-A100
(10kHz, –10dB)

set

VTVM

+

–

Output level measurement point