20
S tight, screw
(PTTWH 3
×
6)
D. SENS (OUT) board
DISC IN DETECT SENSOR ADJUSTMENT
Be sure to perform this adjustment after sensor adjustment in
MECHANICAL ADJUSTMENT.
Connection:
Waveform:
1. Connect the oscilloscope to Pins
1
,
2
, and
3
of TP1 of the
MAIN board.
2. Check that no discs are loaded in the unit.
3. With the power ON, while pressing the
[GROUP FILE]
and
[MEGA CTRL]
buttons, press the
I
/
1
button. Rotate the
[DISC/
CHARCTER]
knob, select “Table Rotation” and press the knob.
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 P.T waveform comes the center of the H portion
of the D.S waveform.
T.P: Pin
1
D.S: Pin
3
GND: Pin
2
oscilloscope
(DC range)
T.P
GND
D.S
MAIN board
TP1
D.S
T.P
5. Rotate the
[DISC/CHARACTER]
knob in the counterclock-
wise 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.
Adjustment Location: MAIN board
D.S
T.P
Should be at the center
D.S
Adjust so that these widths
become the same.
