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Electrical Adjustments
1. Receive the 16-step grey scale computer signal.
2. Set to COMPUTER mode.
3. Enter the service mode.
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.
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.
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 5.5 ±0.1V.
(a)
121v Signal Center adjustment
121c NRS adjustment
1. Receive the 16-step grey scale computer signal.
2. Set to COMPUTER mode.
3. Enter the service mode.
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.
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.
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
b Black Level adjustment
1. Receive the 16-step grey scale video signal.
2. Set to VIDEO mode.
3. Enter the service mode.
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.
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.
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)
1211x Pedestal adjustment
