Sony DVP-CX985V Service Manual page 49

6-4. DISC DETECT SENSOR ADJUSTMENT
Be sure to perform this adjustment after sensor adjustment in ME-
CHANICAL ADJUSTMENT.
Connection:
oscilloscope
MB board
CN701
DSENS_OUT DSENS_OUT: Pin 3
GND GND: Pin 2
HH_OUT HH_OUT: Pin 1
CH1 CH2
Waveform:
CH1 DSENS_OUT
CH2
HH_OUT
1. Connect the oscilloscope to Pins 1, 2 and 3 of CN701 of
the MB board.
2. Check that no discs are loaded in the unit.
3. Perform from step 1 to step 5 in Pop Up Mechanism Adjust-
ment.
[PAUSE]
4. Press the key, then the T.table starts to rotate in the
clockwise direction.
5. Rotate RV101 of MB board and adjust so that the H portion A
of DSENS_OUT waveform is twice the width of the H portion
B of HH_OUT waveform.
A
CH1 DSENS_OUT
B
CH2 HH_OUT
A = 2 × B
Adjustment Location: MB board
6. Loosen the fixing screw, move the mounting board (SENSOR),
and secure the mounting board (SENSOR) at the point the H
portion of the HH_OUT waveform comes the center of the H
portion of the DSENS_OUT waveform.
D. sens (out) board
S tight, screw
(PTTWH 3 × 6)
CH1 DSENS_OUT
CH2
HH_OUT
Should be at the center
Adjustment Location:
– MB Board (Component Side) –
+
RV601
Video Level
Adjustment
RV101
Disc Detect
Sensor Adjustment
– POWER Board (Conductor Side) –
13
CN201
1
49 49
+
RV602
Progressive Video Output
Level Adjustment
IC604
1 3
CN701
+
DVP-CX985V