Mechanical Adjustments; Electrical Adjustments; Tape Section - Sony WM-FX271FP Service Manual

SECTION 3

MECHANICAL ADJUSTMENTS

PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
playback head
capstan wheel assy
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
FWD CQ-102C
FWD
CQ-102C
Back Tension
FF, REW CQ-201B
pinch lever assy
rubber belt
Meter reading
1.97 to 4.90 mN • m
20 to 50 g • cm
(0.28 to 0.69 oz • inch)
less than 0.19 mN • m
less than 2 g • cm
(less than 0.03 oz • inch)
more than 5.89 mN • m
more than 60 g • cm
(more than 0.83 oz • inch)
SECTION 4

ELECTRICAL ADJUSTMENTS

PRECAUTION
• Supplied voltage : 2.5V
• Switch and control position
VOLUME control : maximum
AVLS switch : NORM
• 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, 0 dB)
set
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
WM-FX271FP
Used for
tape speed adjustment
digital frequency
counter
0000
16 Ω
i jack (J301)
7