Sanyo PLC-XU22E Service Manual page 29

Electrical Adjustments
CG/MCI/AV VIDEO ADJUSTMENT-1
Presetting
1. Input the 16-step gray scale video signal, MCI signal
and computer signal.
[CG/MCI/AV-VIDEO ADJUSTMENT] *
2. Connect an oscilloscope to test point "TP512" (+) and
chassis ground (-).
3. Enter to the service mode, select item no. "15" and
change data value to adjust "b" to be 1.0Vp-p at each
VIDEO, MCI and COMPUTER mode.
4. Select COMPUTER and MCI mode, select item no.
"12" and change data value to adjust "a" to be 4.05
±0.01Vp-p.
5. Select VIDEO mode, select item no. "12" and change
data value to adjust "a" to be 4.05 ±0.01Vp-p.
[R-VIDEO ADJUSTMENT]
6. Connect an oscilloscope to test point "TP511" (+) and
chassis ground (-).
7. Enter to the service mode and select COMPUTER
mode.
8. Select item no. "13" and change data value to adjust
"a" to be 4.05 ±0.01Vp-p.
9. Select VIDEO mode and item no. "13" and change
data value to adjust "a" to be 4.05 ±0.01Vp-p.
[B-VIDEO ADJUSTMENT]
10. Connect an oscilloscope to test point "TP513" (+)
and chassis ground (-).
11.Enter to the service mode and select COMPUTER
mode.
12. Select item no. "14" and change data value to adjust
"a" to be 4.05 ±0.01Vp-p.
13. Select VIDEO mode and item no. "14" and change
data value to adjust "a" to be 4.05 ±0.01Vp-p.
white level
(b)
white level
(a)
black level
CG/MCI/AV VIDEO ADJUSTMENT-2
[CG-VIDEO ADJUSTMENT-2]
1. Receive the 16-step grey scale computer signal.
2. Set to COMPUTER mode.
3. Connect an oscilloscope to test point "TP512" (+) and
chassis ground (-).
4. Enter to the service mode, select item no. "15" and
change data value to adjust "b" to be 2.10 ±0.01Vp-p.
[MCI-VIDEO ADJUSTMENT-2] *
5. Receive the 16-step grey scale MCI signal.
6. Set to MCI mode.
7. Connect an oscilloscope to test point "TP512" (+) and
chassis ground (-).
8. Enter to the service mode, select item no. "15" and
change data value to adjust "b" to be 2.10 ±0.01Vp-p.
[AV-VIDEO ADJUSTMENT-2]
9. Receive the 16-step grey scale video signal.
10. Set to VIDEO mode.
11. Connect an oscilloscope to test point "TP512" (+)
and chassis ground (-).
12. Enter to the service mode, select item no. "15" and
change data value to adjust "b" to be 2.15 ±0.01Vp-p.
(b)
(a)
S/H CLOCK ADJUSTMENT
1. Receive the 16-step gray scale computer signal.
2. Set to COMPUTER mode.
3. Connect an oscilloscope to test point "TP512" (+) and
chassis ground (-).
4. Enter to the service mode, select item no. "3" and
change data value to adjust "a" to be maximum.
-28-
white level
white level
black level
(a)