Sony TC-D705 - Section 3, Mechanical Adjustments; Electrical Adjustments

SECTION 3
MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-
moistened swab:
record/playback head pinch roller
erase head rubber belts
capstan . idler
2. Demagnetize the record/playback head with a head ~
demagnetizer.
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 in the rated
power supply voltage unless otherwise noted.
Torque Measurement
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FF,
REW
(0.98
to
L82
oe
et
SECTION 4
ELECTRICAL ADJUSTMENTS
Note: The adjustment should be performed in the
order given in the service manual. As a rule,
adjustment about playback should be per-
formed before adjustment about recording.
The adjustments should be performed for both
L-CH and R-CH.
@Test Mode
The Test mode is activated by shorting Test Point Service
mode (IC851 34 pin changes over to “L”) with the POWER
switch in OFF position, then turning on the POWER switch.
In this mode, the following functions operate:
1. Source monitor
Line mute is cancelled during recording.
2. High speed playback
High speed playback is executed when the HIGH SPEED
(BUBBING) button is pressed during playback. Normal
speed playback is restored when the button is pressed again.
3. Record memory
The tape counter is reset to “0” at the record start point.
After adjustment, open the Service mode to cancel the
Test mode.
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SERVICE MODE