Mechanical Adjustments; Electrical Adjustments; Deck Section - Sony HCD-GV10AV Service Manual

HCD-GV10AV
SECTION 5

MECHANICAL ADJUSTMENTS

Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads pinch rollers
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 sup-
ply voltage unless otherwise noted.
Torque Measurement
Mode Torque Meter
FWD CQ-102C
FWD
CQ-102C
back tension
REV CQ-102RC
REV
CQ-102RC
back tension
FF/REW CQ-201B
FWD tension CQ-403A
REV tension CQ-403A
14
rubber belts
idlers
Meter Reading
3.1 to 6.96 mN•m
(31 to 71 g•cm)
(0.43 – 0.98 oz•inch)
0.20 to 0.58 mN•m
(2 to 6 g•cm)
(0.03 – 0.08 oz•inch)
3.1 to 6.96 mN•m
(31 to 71 g•cm)
(0.43 – 0.98 oz • inch)
0.20 to 0.58 mN•m
(2 to 6 g•cm)
(0.03 – 0.08 oz • inch)
6.97 to 14.02 mN•m
(71 to 143 g•cm)
(0.99 – 1.99 oz • inch)
9.80 mN•m
(100 g or more)
(3.53 oz or more)
9.80 mN•m
(100 g or more)
(3.53 oz or more)
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.
8. Set to the DOLBY NR OFF.
9. Set to the test mode.
(1) Press the ?/1 button to turn the power ON.
(2) Select the function "TAPE A or B".
[
(3) Press the button of
c
[DISC 3]
and simultaneously, to set the tape deck test mode
and displays "TEST MODE" on the fluorescent indicator
tube.
(4) To release from the test mode, press the
• Test Tape
Tape Signal
P-4-A100 10 kHz, – 10 dB
WS-48B 3 kHz, 0 dB
P-4-L300 315 Hz, 0 dB
/CLOCK SET] [ENTER/NEXT]
,
button.
?/1
Used for
Azimuth Adjustment
Tape Speed Adjustment
Playback Level Adjustment
,