Canon D78-5132, Service Manual

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2.11 PC/AV-Video Adjustment-2
[PC-video adjustment-2]
1. Receive the 16-step gray scale computer signal.
2. Set to
COMPUTER mode.
3. Connect an oscilloscope to test point “TP503G” (+) and chassis ground (-).
4. Enter to the service mode, select item no. “15” and change data value to adjust “b” to
be 1.70 ±0.01Vp-p.
[AV-video adjustment-2]
5. Receive the 16-step gray scale video signal.
6. Set to
VIDEO
mode.
7. Connect an oscilloscope to test point “TP503G” (+) and chassis ground (-).
8. Enter to the service mode, select item no. “15” and change data value to adjust “b” to
be 1.85 ±0.01Vp-p.
2.12 S/H Clock Adjustment
1. Receive the 16-step gray scale computer signal.
2. Set to
COMPUTER
mode.
3. Connect an oscilloscope to test point “TP503G” (+) and chassis ground (-).
4. Enter to the service mode, select item no. “3” and change data value to adjust “a” to
be maximum.
Part 3: Adjustment
3-13
(a)
Fig. 3-10
(a)
(b)
black level
white level
white level
Fig. 3-9