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Electrical Adjustments
PSIG ADJUSTMENT
1. Receive the 16-step grey scale computer signal.
2. Set to COMPUTER mode.
3. Connect an oscilloscope to test point "TP1451" (+)
and chassis ground (-).
4. Adjust "a" to be 2.0 ±0.1V by using VR401.
Adjust "b" to be 1.0 ±0.1V by using VR402.
SIGNAL CENTER ADJUSTMENT
Presetting
1. Receive the 16-step grey scale computer signal.
2. Set to COMPUTER mode.
[R-SIGNAL CENTER ADJUSTMENT]
3. Connect a digital voltmeter to test point "TP501R" (+)
and chassis ground (-).
4. Adjust voltage to be 7.30 ±0.05V by using VR503.
[G-SIGNAL CENTER ADJUSTMENT]
5. Connect a digital voltmeter to test point "TP503G" (+)
and chassis ground (-).
6. Adjust voltage to be 7.30 ±0.05V by using VR522.
[B-SIGNAL CENTER ADJUSTMENT]
7. Connect a digital voltmeter to test point "TP505B" (+)
and chassis ground (-).
8. Adjust voltage to be 7.30 ±0.05V by using VR563.
PC/AV GAMMA OFF ADJUSTMENT
PC-GAMMA OFF ADJUSTMENT
1. Receive the 16-step gray scale computer signal.
2. Set to COMPUTER mode.
3. Connect an oscilloscope to test point "TP503G" (+)
4. Enter to the service mode, select item no. "0" and
[AV-GAMMA OFF ADJUSTMENT]
5. Receive the 16-step gray scale video signal.
6. Set to VIDEO mode.
(a)
7. Connect an oscilloscope to test point "TP503G" (+)
(b)
8. Enter to the service mode, select item no. "0" and
* This adjustment should be carried out before
-26-
and chassis ground (-).
change data value to adjust "a" to be 1.40 ±0.01Vp-p.
and chassis ground (-).
change data value to adjust "a" to be 1.40 ±0.01Vp-p.
(a)
adjusting PC/AV-VIDEO ADJUSTMENT-1 and 2.
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