-29-
Electrical Adjustments
Presetting
1. Receive the 16-step grey scale video signal.
2. Set to VIDEO mode.
[R-VIDEO GAIN ADJUSTMENT]
3. Connect an oscilloscope to test point “TP2211R” (+)
and chassis ground (-).
4. Enter to the service mode, select item no. “49” and
change data value to adjust “a” to be 1.12 ±0.02Vp-p.
[G-VIDEO GAIN ADJUSTMENT]
5. Connect an oscilloscope to test point “TP2221G” (+)
and chassis ground (-).
6. Enter to the service mode, select item no. “50” and
change data value to adjust “a” to be 1.12 ±0.02Vp-p.
[B-VIDEO GAIN ADJUSTMENT]
7. Connect an oscilloscope to test point “TP2231B” (+)
and chassis ground (-).
8. Enter to the service mode, select item no. “51” and
change data value to adjust “a” to be 1.12 ±0.02Vp-p.
Pedestal level = Black level
(a)
VIDEO-GAIN ADJUSTMENT-[AV]
Presetting
1. Receive the 16-step grey scale computer signal.
2. Set to COMPUTER mode.
[R-VIDEO CENTER ADJUSTMENT]
3. Connect a digital voltmeter to test point “TP511” (+)
and chassis ground (-).
4. Adjust voltage to be 7.30 ±0.05V by using VR501.
[G-VIDEO CENTER ADJUSTMENT]
5. Connect a digital voltmeter to test point “TP512” (+)
and chassis ground (-).
6. Adjust voltage to be 7.30 ±0.05V by using VR531.
[B-VIDEO CENTER ADJUSTMENT]
7. Connect a digital voltmeter to test point “TP513” (+)
and chassis ground (-).
8. Adjust voltage to be 7.30 ±0.05V by using VR561.
VIDEO CENTER ADJUSTMENT
1. Receive the 16-step grey scale computer signal.
2. Set to COMPUTER mode.
3. Connect an oscilloscope to test point “TP3571” (+)
and chassis ground (-).
4. Adjust “a” to be 5.0 ±0.1V by using VR3571.
(a)
NRS ADJUSTMENT
[GAMMA OFF ADJUSTMENT-CG]
1. Receive the 16-step gray scale computer signal.
2. Set to COMPUTER mode.
3. Connect an oscilloscope to test point “TP512” (+) and
chassis ground (-).
4. Enter to the service mode, select item no. “0” and
change data value to adjust “a” to be 1.70 ±0.01Vp-p.
[GAMMA OFF ADJUSTMENT-AV]
5. Receive the 16-step gray scale video signal.
6. Set to VIDEO mode.
7. Connect an oscilloscope to test point “TP512” (+) and
chassis ground (-).
8. Enter to the service mode, select item no. “0” and
change data value to adjust “a” to be 1.70 ±0.01Vp-p.
GAMMA OFF VIDEO ADJUSTMENT
(a)
Summary of Contents for PLC-SU20B
Page 45: ... 45 TPDVS V SYNC TPDHS H SYNC TP3571 NRS ...
Page 49: ... 49 IC Block Diagrams CXA2111R LCD Driver IC401 CXA2112R Sample Hold IC501 IC531 IC561 ...
Page 51: ... 51 IC Block Diagrams IDT71V016S RAM IC805 LA7217M Sync Separator IC6131 ...
Page 52: ... 52 IC Block Diagrams LB1641 Motor Drive IC5501 IC5551 LC4105V Buffer IC3501 IC3521 IC3541 ...
Page 53: ... 53 IC Block Diagrams M62358FP DAC IC431 MB40988PFQ D A COnverter IC2200 ...
Page 54: ... 54 IC Block Diagrams MC14538BF IC7201 MPC948FA Clock Driver IC1302 ...
Page 58: ... 58 TDA9178T Picture Improvement IC121 IC Block Diagrams ...
Page 81: ...Ref No Part No Description Ref No Part No Description 81 Electrical Parts List ...
Page 84: ...Mechanical Parts List 84 CHASSIS PARTS 24 45 24 72 73 71 57 45 45 45 46 46 46 46 51 51 51 ...
Page 85: ... 85 Mechanical Parts List 32 59 33 58 25 34 28 60 27 45 45 45 45 45 45 ...
Page 88: ...Feb 2000 1300 SI Printed in Japan SANYO Electric Co Ltd ...
