Samsung ML-7300 Series Service Manual page 46

Troubleshooting
Error status
No image (all white)
All Black Image
5-2
Check
1. Check HVPS voltage
2. Check the GND OPC contact.
- Contact among GND OPC
contact points.
- Image cartridge.
- GND OPC terminal on frame
- GND OPC terminal on the
engine board
- Confirm the voltage between
GND-OPC and GND-Frame.
: -130V approx
3. Check LSU operation.
- Refer to DCU control "05"
4. Compare new video board
with present one.
5. Toner empty
1. Check the charger voltage
2. Check the terminal contact
3. Compare new video board with
present one
Solution
1. Refer to HVPS output spec.
- Replace the engine board
2. Fix contact points to fit well.
3. Replace the LSU.
-Refer to "4-8"
4. Replace the video board.
5. Replace the image cartridge.
1. Refer to HVPS output spec
- Replace the engine board
2. Replace terminal
3. Replace video board
Samsung Electronics