Mechanical Adjustments; Electrical Adjustments - Sony HCD-GP7 Service Manual

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MECHANICAL ADJUSTMENTS

3 7 63 1515 0
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 demag-
netizer.
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
FWD
FWD
back tension
REV
REV
back tension
FF/REW
TE
L 13942296513
FWD tension
REV tension
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SECTION 5
pinch rollers
rubber belts
idlers
Torque meter Meter reading
3.04 – 6.96 mN • m
CQ-102C (31 to 71 g • cm)
(0.43 – 0.98 oz • inch)
0.20 – 0.58 mN • m
CQ-102C (2 to 6 g • cm)
(0.02 – 0.08 oz • inch)
3.04 – 6.96 mN • m
CQ-102RC (31 to 71 g • cm)
(0.43 – 0.98 oz • inch)
0.20 – 0.58 mN • m
CQ-102RC (2 to 6 g • cm)
(0.02 – 0.08 oz • inch)
6.97 – 14.02 mN • m
CQ-201B (71 to 143 g • cm)
(0.98 – 1.99 oz • inch)
9.8 mN • m or more
CQ-403A (100 g • cm or more)
(1.4 oz • inch or more)
9.8 mN • m or more
CQ-403R (100 g • cm or more)
(1.4 oz • inch or more)
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ELECTRICAL ADJUSTMENTS

8
DECK SECTION
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
P-4-A100
[Record/Playback Hrad Azimuth Adjustment]
Procedure:
1. Mode: Playback
test tape
Q Q
P-4-A100
3 6 7 1 3
(10 kHz, –10 dB)
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SECTION 6
2 9 9 4 2 8
0 dB=0.775 V
Signal
10 kHz, –10 dB Azimuth Adjustment
MAIN board
CN302
1 5 0 5 8 2 9 9 4
Pin 4 (L-CH)
Pin 6 (R-CH)
set
MAIN board
CN302
Pin 2 (GND)
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co
HCD-GP7
9 9
Used for
2 8 9 9
level meter
+
–
17