[B-signal center adjustment]
8. Connect the digital voltmeter to test point "TP25B1" (+) and chassis ground (-).
9. Select item no. "2" of group no. "3" and change data value to adjust it so that the
voltage value is 7.30 ± 0.05 V.
2.7 Black Level Adjustment
1. Receive the 16-step gray scale computer signal.
2. Set to
COMPUTER
mode.
3. Enter the service mode.
[R-black level adjustment]
4. Connect an oscilloscope to test point "TP25R1" (+) and chassis ground (-).
5. Select item no. "3" of group no. "3" and change data value to adjust it so that
waveform "a" is 10.0 ± 0.1 V.
[G-black level adjustment]
6. Connect an oscilloscope to test point "TP25G1" (+) and chassis ground (-).
7. Select item no. "4" of group no. "3" and change data value to adjust it so that
waveform "a" is 10.0 ± 0.1 V.
[B-black level adjustment]
8. Connect an oscilloscope to test point "TP25B1" (+) and chassis ground (-).
9. Select item no. "5" of group no. "3" and change data value to adjust it so that
waveform "a" is 10.0 ± 0.1 V.
2.8 PC Offset Adjustment
1. Receive the 16-step gray scale computer signal.
2. Set to
COMPUTER
mode.
3. Enter the service mode.
[R offset adjustment]
4. Connect an oscilloscope to test point "TP25R1" (+) and chassis ground (-).
5. Select item no. "11" of group no. "3" and change data value to adjust it so that
waveform "a" (black signal part) has the maximum amplitude.
Part 3: Adjustment
3-12
(a)
black level
black level
Fig. 3-4
Summary of Contents for LV-7355J
Page 9: ...Part 1 General Information ...
Page 22: ...Part 2 Repair Information ...
Page 43: ...Part 3 Adjustment ...
Page 65: ...Part 4 Troubleshooting ...
Page 82: ...Part 4 Troubleshooting 4 17 BA7078AF Selector IC6241 CXA2101AQ RGB Matrix IC4101 ...
Page 85: ...Part 4 Troubleshooting 4 20 ML60851 USB I F IC9801 M62393 D A IC2571 ...
Page 86: ...Part 4 Troubleshooting 4 21 TB1274AF Video Decoder IC1101 TA1318N AFC Detector IC6171 ...
Page 88: ...Part 5 Parts Catalog ...
Page 89: ......
Page 107: ...Part 6 Electrical Diagrams ...
Page 117: ......