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Disc Sensor Adjustment
Be sure to perform this adjustment after sensor adjustment in
MECHANICAL ADJUSTMENT.
Connection:
MAIN board
TP1
D.S
GND
D.S: Pin 1
T.P
T.P: Pin 3
Waveform:
CH1
CH2
Connect the oscilloscope to Pins 1, 2, and 3 of TP1 of the
1.
MAIN board.
2.
Check that no discs are loaded in the unit.
3.
With the power ON, while pressing the GROUP FILE and
MEGA CONTROL buttons, press the 1/u button. Rotate
the DISC/CHARACTER dial, select "Table Rotation" and
press the dial.
The disc table starts to rotate in the clockwise direction.
4.
Loosen the fixing screw, move the mounting board (SENSOR),
and secure the mounting board (SENSOR) at the point the H
portion of the T.P waveform comes the center of the H portion
of the D.S waveform.
D. sens (out) board
S tight, screw
(PTTWH 3
6)
CH1
CH2
Oscilloscope
CH1
CH2
D.S
T.P
D.S
T.P
Should be at the center
5.
Rotate the DISC/CHARACTER knob in the counterclockwise
direction and the disc table starts to rotate in the same direction.
Check that the waveform at this time is the same as that in step
4. If larger by a considerable extent, rotate the DISC/
CHARACTER knob in the clockwise direction and the disc
table starts to rotate in the same direction. Repeat from step 4.
6.
Rotate RV501 of the MAIN board and adjust so that the H and
L portions of the D.S waveform become the same.
CH1
Adjust so that these widths
become the same.
Adjustment Location
[ BD BOARD ] – Side B –
IC102
TP
TP
(FE1)
TP
(RF)
(TE)
IC103
TP
(VC)
D.S
19
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