Canon D78-5382, Руководство по обслуживанию

Страница: 56 / 126

2.9 Gamma Gain Adjustment [AV]
1. Receive the 16-step gray scale composite video signal with
Video [Video]
mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "
TP505R " (+) and chassis ground (-).
4. Select item no. " 13 " and adjust the amplitude "a" to be 4.0 ±0.1V by changing the
Data value.
5. Connect an oscilloscope to test point "
TP503G
" (+) and chassis ground (-).
6. Select item no. " 14 " and adjust the amplitude "a" to be 4.0 ±0.1V by changing the
Data value.
7. Connect an oscilloscope to test point " TP501B " (+) and chassis ground (-).
8. Select item no. "
15
" and adjust the amplitude "a" to be
4.0
±0.1V by changing the
Data value.
Fig. 3-8
2.10 Common Center Adjustment
1. Receive the 1 dot black & white pattern computer signal with Computer [Analog
RGB] mode.
2. Enter the service mode.
3. Project only red light component to the screen.
4. Select item no. "
19 " and change data value to obtain the minimum flicker on the
screen.
6. Project only green light component to the screen.
7. Select item no. "
20
" and change data value to obtain the minimum flicker on the
screen.
8. Project only blue light component to the screen.
9. Select item no. "
21 " and change data value to obtain the minimum flicker on the
screen.
(a)
Part 3: Adjustment
3-11