Canon LV-7105 Service Manual - Page 66

AV Gain Adjustment, 7 PSIG Adjustment, Fig. 3-5

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Part 3: Adjustment 2.6 AV Gain Adjustment 1. Receive the 16-step gray scale video signal. 2. Set to VIDEO mode. 3. Connect an oscilloscope to test point "TP2221G" (+) 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. (a) Pedestal level = Black level Fig. 3-5 2.7 PSIG Adjustment 1. Receive the 16-step gray scale computer signal. 2. Set to COMPUTER mode. 3. Connect an oscilloscope to test point "TP1451" (+) and chassis ground (-). 4. Adjust "a" to be 2.0 ±0.1V by using VR401. Adjust "b" to be 10.0 ±0.1V by using VR402. (a) (b) Fig. 3-6 3-10

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2.6 AV Gain Adjustment
1.
Receive the 16-step gray scale video signal.
2.
Set to
VIDEO
mode.
3.
Connect an oscilloscope to test point “TP2221G” (+) 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.
2.7 PSIG Adjustment
1.
Receive the 16-step gray scale computer signal.
2.
Set to
COMPUTER
mode.
3.
Connect an oscilloscope to test point “TP1451” (+) and chassis ground (-).
4.
Adjust “a” to be 2.0 ±0.1V by using VR401.
Adjust “b” to be 10.0 ±0.1V by using VR402.
Part 3: Adjustment
3-10
Fig. 3-5
Pedestal level = Black level
(a)
Fig. 3-6
(a)
(b)