Sony Walkman WM-PSY02, Руководство по обслуживанию

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SECTION 3
MECHANICAL ADJUSTMENTS
SECTION 4
ELECTRICAL ADJUSTMENTS
Precaution
1. Clean the following parts with a denatured-alcoholmoistened
swab:
playback head pinch roller
capstan rubber belt
2. Demagnetize the 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 sup-
ply voltage (2.5 V) unless otherwise noted.
Torque Measurement
Precaution
• Supplied voltage: 2.5 V
• Switch and control position
TAPE switch: NORM
RADIO switch: DX
VOLUME CONTROL: maximum
AVLS switch: NORM
MEGA BASS switch: OFF
Test tape
Type Signal Used for
WS-48A 3 kHz, 0 dB Tape Speed Adjustment
TAPE SECTION
Tape Speed Adjustment
Procedure:
Playback WS-48A (tape center part) and adjust RV601 so that the
frequency counter reading becomes 3,000 Hz.
Standard value: 2,985 to 3,015 Hz
Adjustment Location:
+
–
test tape
WS-48A
(3 kHz, 0dB)
frequency counter
set
2
jack (J301)
16
Ω
RV601
Mode Torque Meter Meter Reading
FWD
20 – 42 g•cm
CQ-102C (0.28 – 0.58 oz•inch)
FWD less than 2 g•cm
Back Tension (less than 0.03 oz•inch)
FF, REW CQ-201B
more than 60 g•cm
(more than 0.83 oz•inch)
0 dB=0.775 V