Sony WM-FX271FP, Руководство по обслуживанию, Страница: 7 / 22

7
WM-FX271FP
SECTION 3
MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
playback head pinch lever assy
capstan wheel assy 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
supply voltage (2.5 V) unless otherwise noted.
Torque Measurement
Mode Torque meter Meter reading
1.97 to 4.90 mN • m
FWD CQ-102C 20 to 50 g • cm
(0.28 to 0.69 oz • inch)
FWD
less than 0.19 mN • m
Back Tension
CQ-102C less than 2 g • cm
(less than 0.03 oz • inch)
more than 5.89 mN • m
FF, REW CQ-201B more than 60 g • cm
(more than 0.83 oz • inch)
0000
i jack (J301)
digital frequency
counter
set
16
Ω
test tape
WS-48A
(3 kHz, 0 dB)
PRECAUTION
• Supplied voltage : 2.5V
• Switch and control position
VOLUME control : maximum
AVLS switch
: NORM
• Test Tape
Type Signal Used for
WS-48A 3 kHz, 0 dB tape speed adjustment
TAPE SECTION 0 dB = 0.775 V
Tape Speed Adjustment
Procedure:
SECTION 4
ELECTRICAL ADJUSTMENTS
1. Playback WS-48A (tape center part) in the FWD state and
adjust RV601 so that the frequency counter reading
becomes 3,000 Hz.
Specification Value:
Digital frequency counter
2,910 to 3,090 Hz
Adjustment Location:
RV601