Video Gain Adjustment; Pedestal Adjustment - Canon LV-S3E/D78-5423 Service Manual

2.3 Video Gain Adjustment

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 "TPR1" (+) and chassis ground (–).
4. Select item no. "7" and change data value to adjust waveform "a" to be minimum
amplitude.
5. Connect an oscilloscope to test point "TPG1" (+) and chassis ground (–).
6. Select item no. "8" and change data value to adjust waveform "a" to be minimum
amplitude.
7. Connect an oscilloscope to test point "TPB1" (+) and chassis ground (–).
8. Select item no. "9" and change data value to adjust waveform "a" to be minimum
amplitude.
2.4 480p Pedestal Adjustment
1. Receive the 16-step gray scale component signal (480p format) with COMPUTER IN
[COMPONENT] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "TPG1" (+) and chassis ground (–).
4. Select item no. "276" and change data value to adjust the pedestal level and black
level to be the same level.
5. Connect an oscilloscope to test point "TPR1" (+) and chassis ground (–).
6. Select item no. "275" and change data value to adjust the pedestal level and black
level to be the same level.
7. Connect an oscilloscope to test point "TPB1" (+) and chassis ground (–).
8. Select item no. "277" and change data value to adjust the pedestal level and black
level to be the same level.
White Level
(a)
Fig. 3-5
Fig. 3-6
3-9
Part 3: Adjustment