Sanyo PLC-SU32, Service Manual

Page: 62 / 147

-27-
Electrical Adjustments
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 “
TP25R1
” (+)
and chassis ground (-).
5. Select group no. “
3
”, item no. “
0
” and change data
value to adjust the voltage to be 7.30 ±0.05V.
[G-SIGNAL CENTER ADJUSTMENT]
6. Connect a digital voltmeter to test point “
TP25G1
” (+)
and chassis ground (-).
7. Select group no. “
3
”, item no. “
1
” and change data
value to adjust the voltage to be 7.30 ±0.05V.
[B-SIGNAL CENTER ADJUSTMENT]
8. Connect a digital voltmeter to test point “
TP25B1
” (+)
and chassis ground (-).
9. Select group no. “
3
”, item no. “
2
” and change data
value to adjust the voltage to be 7.30 ±0.05V.
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. “
3
”, item no.
“
7
” and change data value to adjust amplitude “a” to
be 4.8 ±0.1V.
(a)
Signal Center adjustment
NRS 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 “
TP25R1
” (+)
and chassis ground (-).
5. Select group no. “
3
”, item no. “
3
” and change data
value to adjust amplitude “a” to be 10.0 ±0.1V.
[R-BLACK ADJUSTMENT-]
6. Connect an oscilloscope to test point “
TP25G1
” (+)
and chassis ground (-).
7. Select group no. “
3
”, item no. “
4
” and change data
value to adjust amplitude “a” to be 10.0 ±0.1V.
[R-BLACK ADJUSTMENT-]
8. Connect an oscilloscope to test point “
TP25B1
” (+)
and chassis ground (-).
9. Select group no. “
3
”, item no. “
5
” and change data
value to adjust amplitude “a” to be 10.0 ±0.1V.
(a)
black level
black level
Black Level 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 “
TP201R
” (+)
and chassis ground (-).
5. Select group no. “
3
”, item no. “
14
” and change data
value to adjust the pedestal level and black level to be
the same level.
[G-PEDESTAL ADJUSTMENT]
6. Connect an oscilloscope to test point “
TP201G
” (+)
and chassis ground (-).
7. Select group no. “
3
”, item no. “
15
” and change data
value to adjust the pedestal level and black level to be
the same level.
[B-PEDESTAL ADJUSTMENT]
8. Connect an oscilloscope to test point “
TP201B
” (+)
and chassis ground (-).
9. Select group no. “
3
”, item no. “
16
” and change data
value to adjust the pedestal level and black level to be
the same level.
Pedestal level = Black level
(a)
Pedestal adjustment