Video Center Adjustment; Psig Adjustment - Canon LV-7215U Service Manual

2.8 Video Center Adjustment

1. Receive the 16-step grey scale computer signal with Computer2 [RGB] mode.
2. Enter the service mode
3. Connect a digital voltmeter to test point "TPG1" (+) and chassis ground (–).
4. Select group no. "10", item no. "0" and change data value to adjust the voltage to be
7.50 ± 0.05V.
5. Connect a digital voltmeter to test point "TPR1" (+) and chassis ground (–).
6. Select item no. "1" and change data value to adjust the voltage to be 7.50 ± 0.05V.
7. Connect a digital voltmeter to test point "TPB1" (+) and chassis ground (–).
8. Select item no. "2" and change data value to adjust the voltage to be 7.50 ± 0.05V.

2.9 PSIG Adjustment

1. Receive the 16-step gray scale computer signal with Computer2 [RGB] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "TPPSIG" (+) and chassis ground (–).
4. Select group no. "10", item no. "14" and adjust the amplitude "a" to be 10.0 ± 0.1V
by changing the Data value.
5. Select item no. "17" and adjust the amplitude "b" to be 3.8 ± 0.1V by changing the
Data value.
6. Connect an oscilloscope to test point "TPZPSIG" (+) and chassis ground (–).
7. Select group no. "10", item no. "12" and adjust the amplitude "a" to be 10.0 ± 0.1V
by changing the Data value.
8. Select item no. "15" and adjust the amplitude "b" to be 3.8 ± 0.1V by changing the
Data value.
(b) (a)
Fig. 3-8
3-15
Part 3: Adjustment