Mechanical Adjustments; Electrical Adjustments - Sony HCD-VZ30AV 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
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
FWD
FWD
back tension
REV
REV
back tension
TE
L 13942296513
FF/REW
FWD tension
REV tension
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SECTION 4
pinch rollers
rubber belts
idlers
Torque meter Meter reading
3.06 N • m to 6.96 N • m
31 to 71 g • cm
CQ-102C
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
CQ-102C 2 to 6 g • cm
(0.02 – 0.08 oz • inch)
3.06 N • m to 6.96 N • m
CQ-102RC 31 to 71 g • cm
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
CQ-102RC 2 to 6 g • cm
(0.02 – 0.08 oz • inch)
6.96 N • m to 14.02 N • m
CQ-201B 71 to 143 g • cm
(0.98 – 1.99 oz • inch)
9.80 N • m
CQ-403A 100 g or more
(3.53 oz or more)
9.80 N • m
CQ-403R 100 g or more
(3.53 oz 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 adjusted.
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.
Tape
P-4-A100
WS-48B
P-4-L300
Record/Playback Head Azimuth Adjustment
(Deck A, Deck B)
Note: Perform this adjustments for both decks.
Procedure:
1. Mode : Playback
Q Q
Test tape
3 6 7 1 3
P-4-A100
(10 kHz, –10 dB)
2. Turn the adjustment screw and check output peaks. If the
peaks do not match for L-CH and R-CH, turn the
adjustment screw so that outputs match within 1 dB of peak.
L-CH
peak
R-CH
peak
Screw
position
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SECTION 5
2 9 9 4 2 8
0 dB=0.775V
Signal
10 kHz, –10 dB Azimuth Adjustment
3 kHz, 0 dB Tape Speed Adjustment
315 Hz, 0 dB Level Adjustment
MAIN board
1 5 0 5 8 2 9 9 4
CN301
Pin 3 (R-CH)
Pin 1 (L-CH)
Set
MAIN board
CN301
Pin 2 (GND)
Output
Within
level
1 dB
L-CH
m
peak
co
9 9
Used for
2 8 9 9
Level meter
+
–
Within 1dB
Screw
R-CH
position
peak
19