Mechanical Adjustments; Electrical Adjustments - Sony HCD-VX3A Service Manual

MECHANICAL ADJUSTMENTS

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
FF/REW
FWD tension
REV tension
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SECTION 5
pinch rollers
rubber belts
idlers
Meter reading
Torque meter
31 to 71 g • cm
CQ-102C
(0.43 – 0.98 oz • inch)
2 to 6 g • cm
CQ-102C
(0.02 – 0.08 oz • inch)
31 to 71 g • cm
CQ-102RC
(0.43 – 0.98 oz • inch)
2 to 6 g • cm
CQ-102RC
(0.02 – 0.08 oz • inch)
71 to 143 g • cm
CQ-201B
(0.98 – 1.99 oz • inch)
100 g or more
CQ-403A
(3.53 oz or more)
100 g or more
CQ-403R
(3.53 oz or more)
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SECTION 6

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
WS-48B 3 kHz, 0 dB
P-4-L300 315 Hz, 0 dB
Record/Playback Head Azimuth Adjustment
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback
test tape
main board
P-4-A100
CN301
(10 kHz, –10 dB)
Pin 3 (L-CH)
Pin 1 (R-CH)
set
main board
CN301
Pin 2 (GND)
Used for
Azimuth Adjustment
Tape Speed Adjustment
Level Adjustment
level meter
+
–
13