Sanyo MS6A Service Manual page 27

Electrical Adjustments
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)
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.
3
", item no.
TP25R1
" (+)
0
" and change data
TP25G1
" (+)
1
" and change data
TP25B1
" (+)
2
" and change data
-27-
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.
(a)
TP25R1
" (+)
3
" and change data
TP25G1
" (+)
4
" and change data
TP25B1
" (+)
5
" and change data
black level
black level