Samsung WC-M15i Series Service Manual page 80

Fault All LEDs On
Description
When turning on, all LEDs are continuously on.
Check
Fuser, LSU, Engine board
Cause
1. Fuser error
2. LSU error
3. Bad connection between engine board and control board.
Solution
1. Replace the fuser.
2. Replace the LSU.
3. Check the wiring between the engine board and the control board.
4. Replace engine board.
Remark
Others
Samsung Electronics
Troubleshooting
Model ML-6100
5-43