Mechanical Adjustments; Electrical Adjustments; Tape Section - Sony WX-C570 Service Manual

SECTION 4

MECHANICAL ADJUSTMENTS

PRECAUTION
1. Wipe the following components with an absorbent cotton cloth
moistened with alcohol before adjustment :
PB head Pinch roller
Idler Rubber belt
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 (14.4V).
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
Meter Reading
30 – 65 g • cm
(0.42 – 0.90 oz • inch)
0.5 – 4.5 g • cm
(0.01 – 0.06 oz • inch)
30 – 65 g • cm
(0.42 – 0.90 oz • inch)
0.5 – 4.5 g • cm
(0.01 – 0.06 oz • inch)
60 – 200 g • cm
(0.83 – 2.78 oz • inch)
Meter Reading
more than 90 g
(more than 3.17 oz)
– 24 –
SECTION 5

ELECTRICAL ADJUSTMENTS

See the adjustment location from on page 27 for the
adjustment.

TAPE SECTION

0 dB = 0.775 V
Tape Speed Adjustment
Procedure :
1. Put the set into the FWD PB mode.
test tape
WS-48A
(3 kHz, 0 dB)
set
LINE OUT REAR
Specification : Constant speed
Speed checker
+ 0.3 to + 1.0 %
Adjustment Location : See page 27.
DOLBY Level Adjustment
Setting :
Preset 3 (SHUF/a) button : OFF
test tape
P-4-D400
(400 Hz, 0 dB)
set
main board
TP (DOLBY)
L-CH
R-CH
Procedure :
1. Put the set into the FWD PB mode.
2. Adjust RV100 (L-CH) and RV200 (R-CH) on main board so
that level meter reading is – 6 ± 0.5 dB (0.37 to 0.41 V).
Adjustment Location : See page 27.
speed checker
or
frequency counter
10 k Ω
Frequency counter
3,010 to 3,030 Hz
level meter