Sony Walkman WM-EX660, Service Manual

Page: 13 / 26

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SECTION 4
MECHANICAL ADJUSTMENTS
SECTION 5
ELECTRICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:
playback head pinch roller
rubber belts capstan
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. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage (1.3 V) unless otherwise noted.
Torque Measurement
Tape Speed Adjustment
Procedure:
PRECAUTION
1. Specified voltage : 1.3 V (DC)
2. Setting
BL SKIP : OFF
SOUND MB/GRV : OFF
AVLS
: OFF
a
NR : OFF
Note: Refer to “Using Other Functions” on page 7.
Test tape
1. Playback WS-48A (tape center) in the FWD state and adjust
RV601 so that the frequency counter reading becomes 3000 ±
10 Hz.
2. Playback WS-48A (tape center) in the REV state.
Check that the frequency counter reading is within 2.5% of
the reading of step 1.
Adjustment Point:
+
–
set
Test tape
WS-48A
(3 kHz, 0 dB)
frequency counter
16
Ω
2
REMOTE jack
RV601
Mode Torque meter Meter reading
FWD
18 – 30 g•cm
CQ-102C
(0.25 – 0.41 oz•inch)
FWD 0.7 – 2.0 g•cm
Back Tension (0.006 – 0.027 oz•inch)
REV
18 – 30 g•cm
CQ-102RC
(0.25 – 0.41 oz•inch)
REV 0.7 – 2.0 g•cm
Back Tension (0.006 – 0.027 oz•inch)
FF, REW CQ-201B
more than 35 g•cm
(more than 0.49 oz•inch)
Type Signal Used for
WS-48A 3 kHz, 0 dB Tape Speed Adjustment