Mechanical Adjustments; Electrical Adjustments; Tape Section - Sony PHC-Z10 Service Manual

SECTION 3

MECHANICAL ADJUSTMENTS

PRECAUTION
1. Clean the following parts with a denatured alcohol-moistened
swab :
record/playback head
playback head
erase head
2. Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head demagnetizer 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 DECK A
Mode Torque meter
Forward
CQ-102C
Forward
CQ-102C
back tension
Fast Forward
CQ-201B
and Rewind
Tape Tension Measurement DECK A
Mode Tension meter
Forward CQ-403A
capstan idlers
pinch roller
rubber belts
DECK B
Meter reading
2.21– 5.39 mN • m
(22.5 to 55 g • cm)
(0.31 to 0.76 oz • inch)
0.20 – 0.49 mN • m
(2 to 5 g • cm)
(0.03 to 0.07 oz • inch)
5.88 – 11.77 mN • m
(60 to 120 g • cm)
(0.83 to 1.67 oz • inch)
DECK B
Meter reading
more than 150 g
(more than 5.29 oz)
SECTION 4

ELECTRICAL ADJUSTMENTS

TAPE SECTION

0 dB = 0.775 V
Standard Output Level
Output terminal SP OUT
6 Ω
load impedance
output signal level 0.775 V (0 dB)
Test Tape
Tape Signal
WS-48B 3 kHz, 0 dB
P-4-A063 6.3 kHz, –10 dB
REC/PB Head Azimuth Adjustment DECK A
Procedure:
1. Mode: playback
test tape
P-4-A063
(6.3 kHz, –10 dB)
set
J901 (phones)
2. Turn the adjustment screw for the maximum output levels. If
these levels do not match. Turn the adjustment screw until both
of output levels match together within 1 dB.
within
L-CH
1 dB
peak
Output
level
R-CH
screw
peak
position
L-CH
peak
PHONES OUT
32 Ω
0.25 V (–10 dB)
Used for
tape speed adjustment
head azimuth adjustment
DECK B
level meter
32 Ω
within
1 dB
angle
R-CH
peak
11