Section 4. Mechanical Adjustment; Section 5. Electrical Adjustment - Sony WM-GX510 Service Manual

SECTION 4
MECHANICAL ADJUSTMENT
PRECAUTION
1. Before adjusting, clean the following parts with a piece of
cotton moistened with alcohol.
REC/PB head pinch roller
rubber belt capstan
2. Demagnetize the playback head using a head
demagnetizer.
3. Do not use a magnetized screwdriver for adjustments.
4. After adjusting, apply screw-locking compound onto the
adjusted parts.
5. Unless specified otherwise, use a specified voltage (1.3V)
to perform the adjustments.
[Torque Measurement]
Torque Meter
Mode
FWD
CQ-102C
FWD
Back tension
REV
CQ-102RC
REV
Back tension
FF
CQ-201B
REW
Meter Reading
18 — 33 g • cm
0.5 — 3.0 g • cm
18 — 33 g • cm
0.5 — 3 g • cm
More than 40 g • cm
— 8 —
SECTION 5
ELECTRICAL ADJUSTMENT
PRECAUTION
1. Specified voltage : 1.3V.
2. Switch position
DOLBY NR switch : OFF
MEGA BASS switch: NORM
AVLS : OFF
CASSETTE SECTION
Test tape
Type Signal
WS-48A 3 kHz, 0 dB
[Tape Speed Adjustment]
Procedure :
Test tape
WS-48A
(3kHz, 0dB)
set
1. Playback WS-48A (tape center part) in the FWD state and
adjust RV601 so that the frequency counter reading
becomes 3000 ± 10 Hz.
2. Playback WS-48A (tape center) in the REV state.
Check that the frequency counter reading is within 2.5%
of the reading of step 1.
Adjustment Point :
[MAIN BOARD] — Side A —
S714
(HOLD)
Used for
Tape Speed Adjustment
frequency
counter
16
PHONES jack
IC601
RV601