Mechanical Adjustments; Electrical Adjustments - Sony WALKMAN WM-EX910 Service Manual

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MECHANICAL ADJUSTMENTS

1. Clean the following parts with a denatured-alcohol-moistened
swab:
playback head
rubber belts
2. Demagnetize the playback head with a head demagnetizer.
(Do not bring the head demagnetizer close to the erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power
supply voltage (1.3 V) unless otherwise noted.
Torque Measurement
Mode
FWD
CQ-102C
FWD
Back Tension
REV
CQ-102RC
REV
Back Tension
FF, REW CQ-201B
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L 13942296513
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SECTION 4
PRECAUTION
pinch roller
capstan
Torque Meter Meter Reading
(1.47 – 2.94 mN•m)
15 – 25 g•cm
(0.22 – 0.36 oz•inch)
(0.029 – 0.196 mN•m)
0.3 – 2.0 g•cm
(0.004 – 0.01 oz•inch)
(1.47 – 2.94 mN•m)
15 – 25 g•cm
(0.22 – 0.36 oz•inch)
(0.029 – 0.196 mN•m)
0.3 – 2.0 g•cm
(0.004 – 0.01 oz•inch)
(more than 3.43 mN•m)
more than 35 g•cm
(more than 0.5 oz•inch)
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ELECTRICAL ADJUSTMENTS

8
1. Specified voltage
2. Switch position
VOL, AVLS
3. Remote control setting
HOLD switch
VOL knob
DOLBY NR
SOUND mode
0 dB=0.775 V
Test tape
Type
WS-48A
Tape Speed Adjustment
Setting:
test tape
WS-48A
(3 kHz, 0 dB)
Procedure:
1. Playback WS-48A (tape center) in the FWD state.
2. Adjsut RV601 so that the frequency counter reading becomes
3,000 Hz.
Q Q
3 6 7 1 3
Specification Values: 2,985 to 3,015 Hz
3. Playback WS-48A (tape center) in the REV state.
Check that the frequency counter reading is within 2.0%
(approx.60 Hz) of the reading of step 1.
Adjustment Location:
– MAIN BOARD –
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– 11 –
SECTION 5
2 9 9 4 2 8
PRECAUTION
: 1.3 V (DC)
: Center
: OFF
: MAX
: OFF
: Normal
Signal
3 kHz, 0 dB Tape Speed Adjustment
frequency counter
16 Ω
set
i jack (J301)
1 5 0 5 8 2 9 9 4
RV601
m
co
9 9
Used for
+
–
2 8 9 9