Mechanical Adjustments; Electrical Adjustments; Tape Section - Sony WX-4500X Service Manual

WX-4500X
SECTION 4

MECHANICAL ADJUSTMENTS

PRECAUTION
1. Wipe the following components with an absorbent cotton cloth
moistened with alcohol before adjustment :
PB head
Idler
Capstan
2. Demagnetize the PB head using a head demagnetizer.
3. Be careful not to use a magnetized screwdriver.
4. After the adjustment is completed, lock the adjustment parts
using screws.
5. Unless otherwise specified, make adjustments at the specified
voltage (14.4 V).
Torque Measurement
Mode Torque Meter
FWD
CQ-102C
FWD
Back Tension
REV
CQ-102RC
REV
Back Tension
FF, REW CQ-201B
Tape Tension Measurement
Mode Tension Meter
FWD CQ-403A
REV CQ-403R
20
Pinch roller
Rubber belt
Meter Reading
2.95 – 6.37 mN • m
(30 – 65 g • cm)
(0.42 – 0.90 oz • inch)
0.05 – 0.44 mN • m
(0.5 – 4.5 g • cm)
(0.01 – 0.06 oz • inch)
2.95 – 6.37 mN • m
(30 – 65 g • cm)
(0.42 – 0.90 oz • inch)
0.05 – 0.44 mN • m
(0.5 – 4.5 g • cm)
(0.01 – 0.06 oz • inch)
5.88 – 19.61 mN • m
(60 – 200 g • cm)
(0.83 – 2.78 oz • inch)
Meter Reading
more than 90 g
(more than 3.17 oz)
SECTION 5

ELECTRICAL ADJUSTMENTS

• Adjustments of the tuner and CD sections have auto adjustments
in this set.

TAPE SECTION

0 dB = 0.775 V
Test tape
Type Signal
WS-48A 3 kHz, 0 dB
P-4-D400 400 Hz, 0 dB
Tape Speed Adjustment
Mode : FWD play
test tape
WS-48A
(3 kHz, 0 dB)
set
Procedure:
1. Playback the test tape in the FWD play mode.
2. Verify that the reading on the digital frequency counter is in the
range between 3,010 and 3,300 Hz at the top of tape.
3. If the specified value is not met, adjust the variable resistor on
the capstan motor so that the reading is 3,000 Hz at the FWD
top of tape.
Adjustment Location :
-Tape Mechanism Block upper side-
Use
Tape speed adjustment
Dolby level adjustment
frequency counter
4 Ω
SP OUT
Tape Speed Adjustment