Casio QV-780 Service Manual & Parts List page 14

3-3.Backlight drive voltage adjustment
Apply 5.0 ± 0.05 [V] on check point CP101. (For normal check, AC adaptor can be used, however,
when the camera is faulty, apply the above mentioned voltage.)
(1) Adjust VR900 so that CP901 (VBL) is 11.5 ± 0.1 [V].
Also make sure that the current consumption is not abnormally large.
3-4.VCOM AC adjustment and VCOM DC coarse adjustment
• Show color bar in test mode.
• Apply 5.0 ± 0.05 [V] on check point CP101. (For normal check, AC adaptor can be used, however,
when the camera is faulty, apply the above mentioned voltage.)
(1) Make sure that the oscillation level of VCOM output (CP351) is 6.0 ± 0.3 [V].
(2) Adjust VR350 so that the low level potential is 2.5 ± 0.2 [V].
Power
Supply
QV-780
PCB K772A-L
VCOM
(CP351)
— 12 —
2.5±0.2 [V]
0 [V]
Oscilloscope