Mechanical Adjustments; Electrical Adjustments; Deck Section - Sony HCD-GNX660 Servise Manual

HCD-GNX660
QQ
SECTION 5
3 7 63 1515 0

MECHANICAL ADJUSTMENTS

Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads pinch rollers
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.
Torque Measurement
Mode Torque meter
FWD CQ-102C
FWD
CQ-102C
back tension
FF/REW CQ-201B
TE
L 13942296513
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Meter reading
2.9 mN • m to 6.9 mN • m
30 to 70 g • cm
(0.42 – 0.97 oz • inch)
0.15 mN • m to 0.59 mN • m
1.6 to 6 g • cm
(0.022 – 0.08 oz • inch)
4.8 mN • m to 16.7 mN • m
49 to 170 g • cm
(0.69 – 2.36 oz • inch)
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SECTION 6
2 9
8

ELECTRICAL ADJUSTMENTS

DECK SECTION

0 dB=0.775 V
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 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
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.
• Test Tape
Tape Signal
P-4-A100 10 kHz, –10 dB
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
DECK A DECK B
Note: Perform this adjustments for both decks
Q Q
Procedure:
3 6 7 1 3 1 5
1. Mode: Playback
test tape
MAIN board
P-4-A100
CN121
(10 kHz, –10 dB)
Pin 3 (L-CH)
Pin 1 (R-CH)
set
MAIN board
CN121
Pin 2 (GND)
co
.
9 4 2 8
Used for
Azimuth Adjustment
0 5 8 2 9 9 4 2 8
level meter
+
–
m
9 9
9 9