Sub Gain Adjustment [Pc]; Sub Gain Adjustment [Av] - Canon LV-7215U Service Manual

Part 3: Adjustment

2.6 Sub Gain Adjustment [PC]

1. Receive the 16-step grey scale computer signal with Computer2 [RGB] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "TPG1" (+) and chassis ground (–).
4. Select group no. "9", item no. "1" and adjust the amplitude "a" to be minimum by
changing the Data value.
5. Connect an oscilloscope to test point "TPR1" (+) and chassis ground (–).
6. Select item no. "2" and adjust the amplitude "a" to be minimum by changing the Data
value.
7. Connect an oscilloscope to test point "TPB1" (+) and chassis ground (–).
8. Select item no. "3" and adjust the amplitude "a" to be minimum by changing the Data
value.

2.7 Sub Gain Adjustment [AV]

1. Receive the 16-step grey scale composite video signal with Video [Video] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "TPG1" (+) and chassis ground (–).
4. Select group no. "9", item no. "1" and adjust the amplitude "a" to be minimum by
changing the Data value.
5. Connect an oscilloscope to test point "TPR1" (+) and chassis ground (–).
6. Select item no. "2" and adjust the amplitude "a" to be minimum by changing the Data
value.
7. Connect an oscilloscope to test point "TPB1" (+) and chassis ground (–).
8. Select item no. "3" and adjust the amplitude "a" to be minimum by changing the Data
value.
White Level
(a)
Fig. 3-6
White Level
(a)
Fig. 3-7
3-14