Casio QV-780 Service Manual & Parts List page 16

3-6.BCC adjustment
• Perform this procedure with color adjustment
• Show color bar in test mode.
• Power supply voltage VCL 0 (CP101) = 5.0 ± 0.05 V.(For normal check, AC adaptor can be used,
however, when the camera is faulty, apply the above mentioned voltage.)
• Adjust L300 so that four pulses of VB waveforms (CP324) almost have no amplitude.
(1) Perform this procedure after contrast adjustment.
(2) Set the pedestal voltage of VB to 5.0 ± 0.1 Vp-p by adjusting BRIGHT VR (VR302).
(3) Use FRP (CP711) for trigger.
(4) If waveform changes by adjusting color perform Step (2).
Power
Supply
Adjust to same level
L-PCB
VB terminal
(CP324)
— 14 —
Oscilloscope