Mechanical Adjustments; Electrical Adjustments - Sony WM-EX660 Service Manual

SECTION 4

MECHANICAL ADJUSTMENTS

PRECAUTION
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. 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
Mode Torque meter
FWD
CQ-102C
FWD
Back Tension
REV
CQ-102RC
REV
Back Tension
FF, REW CQ-201B
pinch roller
capstan
Meter reading
18 – 30 g•cm
(0.25 – 0.41 oz•inch)
0.7 – 2.0 g•cm
(0.006 – 0.027 oz•inch)
18 – 30 g•cm
(0.25 – 0.41 oz•inch)
0.7 – 2.0 g•cm
(0.006 – 0.027 oz•inch)
more than 35 g•cm
(more than 0.49 oz•inch)
– 13 –
SECTION 5

ELECTRICAL ADJUSTMENTS

PRECAUTION
1. Specified voltage : 1.3 V (DC)
2. Setting
BL SKIP : OFF
SOUND MB/GRV : OFF
AVLS : OFF
aNR
: OFF
Note: Refer to "Using Other Functions" on page 7.
Test tape
Type Signal
WS-48A 3 kHz, 0 dB
Tape Speed Adjustment
Procedure:
Test tape
WS-48A
(3 kHz, 0 dB)
set
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:
Used for
Tape Speed Adjustment
frequency counter
16 Ω
+
–
2 REMOTE jack
RV601