Canon LV-7105E/D78-5133 - Manual (Page 66)

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)