Troubleshooting - Casio QV-10A Service Manual & Parts List

Pattern
generator
Input
TP101
Input Input
Connection Point
Color bar
Pattern
TP101
38.9 MHz
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-10A
VCC2
Set
10 K
CP303
Output
TP412
TP410
Trigger
Input Output
Adjust
Signal Connection
VR304
Oscilloscope
VR300

TROUBLESHOOTING

— 18 —
Oscilloscope
B
Output
Point
Adjust VR304 until A in the above
diagram equals 3.5 ± 0.1 V.
TP412
Adjust VR300 until B in the above
diagram equals 3.1 ± 0.1 V.
A
Result