Mechanical Adjustments; Electrical Adjustments - Sony HCD-ZUX10D Service Manual

HCD-ZUX10D
SECTION 5

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. (Do not bring the head magnetizer close to the
erase head.)
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
Torque meter
Mode
FWD CQ-102C
FWD
CQ-102C
back tension
REV
CQ-102RC
REV
CQ-102RC
back tension
FF/REW
CQ-201B
32
pinch roller
rubber belts
idlers
Meter reading
2.9 mN • m to 6.9 mN • m
30 to 70 g • cm
(0.42 – 0.97 oz • inch)
0.15 mN • m to 0.59 mN • m
2 to 6 g • cm
(0.03 – 0.08 oz • inch)
2.9 mN • m to 6.9 mN • m
30 to 70 g • cm
(0.42 – 0.97 oz • inch)
0.15 mN • m to 0.59 mN • m
2 to 6 g • cm
(0.03 – 0.08 oz • inch)
4.8 mN • m to 16.7 mN • m
49 to 170 g • cm
(0.68 – 2.36 oz • inch)
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
[RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT]
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback
test tape
P-4-A100
(10 kHz, − 10 dB)
set
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 1dB of peak.
within
L-CH
1dB
peak
output
level
R-CH
peak
screw
position
Used for
Azimuth Adjustment
JACK board
PHONES jack
(J904)
level meter
+
–
within
1dB
screw
position
L-CH
R-CH
peak peak