Mechanical Adjustments; Electrical Adjustments; Tape Section - Sony WM-PSY02 Service Manual

SECTION 3

MECHANICAL 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
Mode Torque Meter
FWD
CQ-102C
FWD
Back Tension
FF, REW CQ-201B
Meter Reading
20 – 42 g•cm
(0.28 – 0.58 oz•inch)
less than 2 g•cm
(less than 0.03 oz•inch)
more than 60 g•cm
(more than 0.83 oz•inch)
– 6 –
SECTION 4

ELECTRICAL ADJUSTMENTS

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
WS-48A 3 kHz, 0 dB

TAPE SECTION

0 dB=0.775 V
Tape Speed Adjustment
Procedure:
test tape
WS-48A
(3 kHz, 0dB)
set
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:
RV601
Used for
Tape Speed Adjustment
frequency counter
16 Ω
+
–
2
jack (J301)