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HCD-GN700/GX8800
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
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
REV
CQ-102RC
REV
CQ-102RC
back tension
TE
L 13942296513
FF/REW
CQ-201B
FWD tension
CQ-403A
REV tension
CQ-403R
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pinch rollers
Meter reading
3.06 N • m to 6.96 N • m
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
3.06 N • m to 6.96 N • m
31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
2 to 6 g • cm
(0.02 – 0.08 oz • inch)
6.96 N • m to 14.02 N • m
71 to 143 g • cm
(0.98 – 1.99 oz • inch)
9.80 N • m
100 g or more
(3.53 oz or more)
9.80 N • m
100 g or more
(3.53 oz or more)
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SECTION 6
8
ELECTRICAL ADJUSTMENTS
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
Signal
P-4-A100
10 kHz, –10 dB
RECORD/PLAYBACK HEAD AZIMUTH ADJUST-
MENT
DECK A
DECK B
Note: Perform this adjustments for both decks
Q Q
Procedure:
3
6 7
1 3
1. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
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2 9
9 4
2 8
0 dB=0.775 V
Used for
Azimuth Adjustment
1 5
0 5
8
2 9
9 4
MAIN board
CN301
Pin 1 (L-CH)
level meter
Pin 3 (R-CH)
set
+
–
MAIN board
CN301
Pin 2 (GND)
m
co
9 9
2 8
9 9
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