Canon LV-7105 Service Manual - Page 68

PC/AV-Video Adjustment-1, Presetting

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Part 3: Adjustment 2.10 PC/AV-Video Adjustment-1 Presetting 1. Input the 16-step gray scale video signal and computer signal. [PC/AV-video adjustment] 2. Connect an oscilloscope to test point "TP503G" (+) and chassis ground (-). 3. Enter to the service mode, select item no. "15" and change data value to adjust "b" to be 1.5 ±0.01Vp-p at each VIDEO and COMPUTER mode. 4. Select COMPUTER mode, select item no. "12" and change data value to adjust "a" to be 4.00 ±0.01Vp-p. 5. Select VIDEO mode, select item no. "12" and change data value to adjust "a" to be 4.00 ±0.01Vp-p. [R-video adjustment] 6. Connect an oscilloscope to test point "TP501R" (+) and chassis ground (-). 7. Enter to the service mode and select COMPUTER mode. 8. Select item no. "13" and change data value to adjust "a" to be 4.00 ±0.01Vp-p. 9. Select VIDEO mode and item no. "13" and change data value to adjust "a" to be 4.00 ±0.01Vp-p. [B-video adjustment] 10. Connect an oscilloscope to test point "TP505B" (+) and chassis ground (-). 11. Enter to the service mode and select COMPUTER mode. 12. Select item no. "14" and change data value to adjust "a" to be 4.00 ±0.01Vp-p. 13. Select VIDEO mode and item no. "14" and change data value to adjust "a" to be 4.00 ±0.01Vp-p. white level (b) white level (a) black level Fig. 3-8 3-12

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2.10 PC/AV-Video Adjustment-1
Presetting
1.
Input the 16-step gray scale video signal and computer signal.
[PC/AV-video adjustment]
2.
Connect an oscilloscope to test point “TP503G” (+) and chassis ground (-).
3.
Enter to the service mode, select item no. “15” and change data value to adjust “b” to
be 1.5 ±0.01Vp-p at each
VIDEO
and
COMPUTER
mode.
4. Select
COMPUTER
mode, select item no. “12” and change data value to adjust “a” to
be 4.00 ±0.01Vp-p.
5. Select
VIDEO
mode, select item no. “12” and change data value to adjust “a” to be
4.00 ±0.01Vp-p.
[R-video adjustment]
6.
Connect an oscilloscope to test point “TP501R” (+) and chassis ground (-).
7.
Enter to the service mode and select
COMPUTER
mode.
8.
Select item no. “13” and change data value to adjust “a” to be 4.00 ±0.01Vp-p.
9. Select
VIDEO
mode and item no. “13” and change data value to adjust “a” to be 4.00
±0.01Vp-p.
[B-video adjustment]
10.Connect an oscilloscope to test point “TP505B” (+) and chassis ground (-).
11.Enter to the service mode and select
COMPUTER
mode.
12.Select item no. “14” and change data value to adjust “a” to be 4.00 ±0.01Vp-p.
13.Select
VIDEO
mode and item no. “14” and change data value to adjust “a” to be 4.00
±0.01Vp-p.
Part 3: Adjustment
3-12
(a)
(b)
black level
white level
white level
Fig. 3-8