Sony WM-A52 - Page 4

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‘\WM-A52/B52 ©
PRECAUTION
1. Clean the following parts with a denaturedalcohol-
moistened swab:
playback head pinch roller
erase head . __ Tubber belts
capstan idlers
2. Demagnetize the playback head with a head de-
magnetizer, e
3. Do not use a magnetized screwdriver for the adjust-
ments.
|
4. After the adjustments, apply suitable locking com-
pound to the parts adjusted.
5. The adjustments should be performed with the rated
power supply voltage unless otherwise noted.
1-1. MECHANICAL ADJUSTMENTS
TORQUE MEASUREMENT
;
0.5
—
4.5
g-cm
FWD
Back
Tension
|
(0.007
-0.06
oz:
inch)
more
than
55
g-cm
FF,
REW
CQ-201B
(0.76
oz+inch)
TAPE TENSION MEASUREMENT
Meter reading _
CQ-102C
more than 90g
EWD CQA03A (3.17 02) |
Tape Speed Adjustment
Setting:
VOL control: mechanical mid |
Procedure: |
Mode: playback
speed checker or
digital frequency
test tape counter .
WS-48A
(3 kHz OdB)
headphone jack
Play back the end of the tape in FWD mode and adjust
' RV601 for the specification. .
The specification should be satisfied in any condition of
tape top, tape end, high and low voltage, vertical and
horizontal stand. :
30 — 60 g°-cm
(0.41 — 0.83 0z-inch) |
SECTION 1
ADJUSTMENTS
1-2. ELECTRICAL ADJUSTMENTS
PB Head Azimuth Adjustment
Procedure:
1. Mode: playback
test tape
P-4-A063
(6.3 kHz, -100B)
headphone jack
Turn the adjustment screw for the maximum output
leveis. If these levels do not match, turn the adjust-
ment screw until both of output levels match to-
Screw peak
Position
Adjustment Location:
adjustment screw
Specification: — 8
2910-30908
Adjustment Location: main board
-RV601