Sony DVPC-X850D, Service Manual

Page: 97 / 124

7-2E
Adjust the position (angle) of the TS-150 board until the top peak
of the SI-E signal (pin-2 of CN704 on TS-150 board) is positioned
at the center of the period when both the T. SENS2 signal and T.
SENS3 signal are High.
Fig. 7-4
7-3. DISC SENSOR LEVEL
ADJUSTMENT
Adjustment Procedure:
1.
Enter the test mode. Select “2. Drive Manual Operation” from
the test menu.
2. Select “8. 200CHG MechaCon 2” from the operation menu.
3. Press the r button to release chucking.
4. Press the PAUSE button so that the disc table rotates
continuously in the clockwise direction.
5. Observe the SI-E signal at pins-2, -4 and -5 of CN704 on TS-
150 board. Adjust RV701 on the TS-150 board so that the duty
ratio of the waveform becomes 4:1.
Fig. 7-5
7-4. DISC/TABLE SENSOR CHECK
Adjustment Procedure:
1.
Enter the test mode. Select “2. Drive Manual Operation” from
the test menu.
2. Select “8. 200CHG MechaCon 2” from the operation menu.
3. Remove the disc from the disc table.
4. Confirm that, when you press the CLEAR button, the Disc
Count indicates 0, and the disc table rotates so that the Disc
No. 2 comes to the front of the door and stops.
(Clockwise direction when viewed from the top: turning to the right)
T.SENS2
T.SENS3
SI-E
Peak
Peak
SI-E : Peak = 0
±
2.5 mS
(0 : Center of T.SENS2 = "H" and T.SENS3 = "H")
VH = 3 V (saturated)
SI-E signal at
pin-2/CN704
VL = 1.5
±
0.5 V