Sanyo PLC-XU32 Service Manual page 27

Electrical Adjustments
Pedestal adjustment
1. Receive the 16-step grey scale video signal.
2. Set to VIDEO mode.
3. Enter the service mode.
[R-PEDESTAL ADJUSTMENT]
4. Connect an oscilloscope to test point "
and chassis ground (-).
3
5. Select group no. " ", item no. "
value to adjust the pedestal level and black level to be
the same level.
[G-PEDESTAL ADJUSTMENT]
6. Connect an oscilloscope to test point "
and chassis ground (-).
3
7. Select group no. " ", item no. "
value to adjust the pedestal level and black level to be
the same level.
[B-PEDESTAL ADJUSTMENT]
8. Connect an oscilloscope to test point "
and chassis ground (-).
3
9. Select group no. " ", item no. "
value to adjust the pedestal level and black level to be
the same level.
Pedestal level = Black level
NRS adjustment
1. Receive the 16-step grey scale computer signal.
2. Set to COMPUTER mode.
3. Connect an oscilloscope to test point "TP3551" (+)
and chassis ground (-).
4. Enter the service mode, select group no. "
7
" " and change data value to adjust amplitude "a" to
be 5.5 ±0.1V.
(a)
TP201R
" (+)
14
" and change data
TP201G
" (+)
15
" and change data
TP201B
" (+)
16
" and change data
(a)
3
", item no.
-27-
Signal Center adjustment
1. Receive the 16-step grey scale computer signal.
2. Set to COMPUTER mode.
3. Enter the service mode.
[R-SIGNAL CENTER ADJUSTMENT]
4. Connect a digital voltmeter to test point "
and chassis ground (-).
3
5. Select group no. " ", item no. "
value to adjust the voltage to be 7.30 ±0.05V.
[G-SIGNAL CENTER ADJUSTMENT]
6. Connect a digital voltmeter to test point "
and chassis ground (-).
3
7. Select group no. " ", item no. "
value to adjust the voltage to be 7.30 ±0.05V.
[B-SIGNAL CENTER ADJUSTMENT]
8. Connect a digital voltmeter to test point "
and chassis ground (-).
3
9. Select group no. " ", item no. "
value to adjust the voltage to be 7.30 ±0.05V.
Black Level adjustment
1. Receive the 16-step grey scale computer signal.
2. Set to COMPUTER mode.
3. Enter the service mode.
[R-BLACK ADJUSTMENT]
4. Connect an oscilloscope to test point "
and chassis ground (-).
3
5. Select group no. " ", item no. "
value to adjust amplitude "a" to be 10.0 ±0.1V.
[R-BLACK ADJUSTMENT-]
6. Connect an oscilloscope to test point "
and chassis ground (-).
3
7. Select group no. " ", item no. "
value to adjust amplitude "a" to be 10.0 ±0.1V.
[R-BLACK ADJUSTMENT-]
8. Connect an oscilloscope to test point "
and chassis ground (-).
3
9. Select group no. " ", item no. "
value to adjust amplitude "a" to be 10.0 ±0.1V.
TP25R1
0
" and change data
TP25G1
1
" and change data
TP25B1
2
" and change data
TP25R1
3
" and change data
TP25G1
4
" and change data
TP25B1
5
" and change data
black level
(a)
black level
" (+)
" (+)
" (+)
" (+)
" (+)
" (+)