Canon D78-5132, Service Manual

Page: 65 / 134

2.5 Component Gain Adjustment
1. Receive the 16-step gray scale component video signal.
2. Set to
VIDEO
(Component) mode.
[Component-R gain adjustment]
3. Connect an oscilloscope to test point “TP2211R” (+) and chassis ground (-).
4. Enter to the service mode, select item no. “30” and change data value to adjust “a” to
be 1.05 ±0.01Vp-p.
[Component-G gain adjustment]
5. Connect an oscilloscope to test point “TP2221G” (+) and chassis ground (-).
6. Select item no. “273” and change data value to adjust “a” to be 1.05 ±0.01Vp-p.
[Component-B gain adjustment]
7. Connect an oscilloscope to test point “TP2231B ” (+) and chassis ground (-).
8. Select item no. “274” and change data value to adjust “a” to be 1.05 ±0.01Vp-p.
Part 3: Adjustment
3-9
Pedestal level = Black level
(a)
Fig. 3-3
Fig. 3-4
Pedestal level = Black level
(a)