Canon LV-7105 Service Manual - Page 65

Component Gain Adjustment

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Part 3: Adjustment (a) Pedestal level = Black level Fig. 3-3 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. (a) Pedestal level = Black level Fig. 3-4 3-9

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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)