Mechanical Adjustments; Electrical Adjustments - Sony HCD-GSX75 Service Manual

HCD-GSX75
SECTION 5

MECHANICAL ADJUSTMENTS

• TAPE MECHANISM DECK SECTION
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads
erase head
capstan
2. Demagnetize the record/playback head with a head demagne-
tizer.
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.
Torque Measurement
Mode
Torque meter
CQ-102C
FWD
FWD /REV
CQ-102C
back tension
REV CQ-102RC
FF/REW CQ-201B
18
pinch rollers
rubber belts
idlers
Meter reading
2.44 mN • m to 8.33 mN • m
30 to 85 g • cm
(0.42 – 1.17 oz • inch)
0.14 mN • m to 0.59 mN • m
2 to 6 g • cm
(0.03 – 0.08 oz • inch)
2.94 mN • m to 7.84 mN • m
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
6.86 mN • m to 20.6 mN • m
71 to 210 g • cm
(0.98 – 2.91 oz • inch)
SECTION 6

ELECTRICAL ADJUSTMENTS

DECK SECTION
0 dB = 0.775 V
Precaution
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
Tape Signal
P-4-A100 10 kHz, – 10 dB
WS-48B 3 kHz, 0 dB
Used for
Azimuth Adjustment
Tape Speed Check