Read Sony HCD-VZ30AV / MHC-VZ30AV Service Manual online
19
Precaution
1.
1.
Clean the following parts with a denatured alcohol-
moistened swab:
moistened swab:
record/playback heads
pinch rollers
erase head
rubber belts
capstan
idlers
2.
Demagnetize the record/playback head with a head
demagnetizer.
demagnetizer.
3.
Do not use a magnetized screwdriver for the adjustments.
4.
After the adjustments, apply suitable locking compound to
the parts adjusted.
the parts adjusted.
5.
The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
supply voltage unless otherwise noted.
Torque Measurement
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.
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
peak
R-CH
peak
peak
Screw
position
position
Output
level
level
Within
1 dB
1 dB
L-CH
peak
peak
R-CH
peak
peak
Screw
position
position
Within 1dB
SECTION 5
ELECTRICAL ADJUSTMENTS
SECTION 4
MECHANICAL ADJUSTMENTS
DECK SECTION
0 dB=0.775V
1.
Demagnetize the record/playback head with a head
demagnetizer.
demagnetizer.
2.
Do not use a magnetized screwdriver for the adjustments.
3.
After the adjustments, apply suitable locking compound to
the parts adjusted.
the parts adjusted.
4.
The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
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.)
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.
R-CH.
7.
Switches and controls should be set as follows unless
otherwise specified.
otherwise specified.
Record/Playback Head Azimuth Adjustment
(Deck A, Deck B)
(Deck A, Deck B)
Note: Perform this adjustments for both decks.
Procedure:
1.
1.
Mode : Playback
Tape
Signal
Used for
P-4-A100
WS-48B
P-4-L300
10 kHz, –10 dB
3 kHz, 0 dB
315 Hz, 0 dB
Azimuth Adjustment
Tape Speed Adjustment
Level Adjustment
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)
Mode
Torque meter
CQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
Meter reading
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension
Set
MAIN board
CN301
Pin 3 (R-CH)
Pin 1 (L-CH)
CN301
Pin 3 (R-CH)
Pin 1 (L-CH)
MAIN board
CN301
Pin 2 (GND)
CN301
Pin 2 (GND)
+
–
–
Level meter
Test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
Click on the first or last page to see other HCD-VZ30AV / MHC-VZ30AV service manuals if exist.