Troubleshooting - Casio QV-30 Service Manual & Parts List

Pattern
generator
Input
CP101
Input Input
Connection Point
Pattern
CP101
generator
No Display
1. Check the slide switch on the key PCB.
2. Check the fuse (FU500) on the digital PCB.
3. Check the fuse (FU100) on the linear PCB.
4. Check the jack (JK500) on the digital PCB.
5. Check the flat cable between the digital and linear PCBs.
6. Check the back light.
7. Check the LCD.
No Display at Record Mode
1. Check the camera unit.
Defect of the Camera Unit
The camera unit must be replaced with whole unit when it is defective, because the precise adjustment is
required when the individual parts of the camera unit are replaced, and it can be done only at our factory.
(Except for replacing the outer case of the camera unit)
Bright and Contrast Adjustment
QV-10 QV-30
Set
10 K
CP303
Output
CP412
CP410
Trigger
Input
Adjust
Signal
Color bar VR304
45.75 MHz
VR300

TROUBLESHOOTING

— 18 —
VCC2
Oscilloscope
B
Output Output
Connection Point
Adjust VR304 until A in the above
diagram equals 3.5 ± 0.1 V.
Oscilloscope CP412
Adjust VR300 until B in the above
diagram equals 3.1 ± 0.1 V.
A
Result