Section 4. Adjustments; Mechanical Adjustments; Electrical Adjustments - Sony WM-FX822 Service Manual

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4-1. MECHANICAL ADJUSTMENTS

PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
playback head
capstan
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 (1.3V) unless otherwise noted.
Torque Measurement
Mode Torque Meter
FWD
CQ-102C
FWD
Back Tension
REV
CQ-102RC
REV
Back Tension
FF
TE CQ-201B
L 13942296513
REW
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SECTION 4
ADJUSTMENTS
rubber belts
pinch roller
Meter Reading
18 — 33 g • cm
0.5 — 3 g • cm
18 — 33 g • cm
0.5 — 3 g • cm
more than 60 g • cm
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4-2. ELECTRICAL ADJUSTMENTS

TAPE SECTION
PRECAUTION
1. Power supply voltage : 1.3V.
2. Switch position
DOLBY NR switch : OFF
EX DBB switch : NORM
Test Tape
Type
Signal
WS-48A 3 kHz, 0 dB
TAPE SPEED ADJUSTMENT
Procedure :
Test Tape
WS-48A
(3kHz, 0dB)
set
Q Q
3 6 7 1 3 1 5
1. Play back WS-48A (tape center portion) in FWD mode.
Adjust the RV601 so that the frequency counter reads 3,000 ±
30 Hz.
2. Play back WS-48A (tape center portion) in REV mode.
Confirm that the reading of frequency counter is within 2.5%
from the reading in step 1.
Adjustment Part Location Diagram :
[MAIN BOARD] (SIDE A)
co
.
— 8 —
9 4 2 8
Used for
Tape Speed Adjustment
frequency
counter
16
+
–
REMOTE jack
0 5 8 2 9 9 4 2 8
RV601
ND701
m
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