Service manual

4. Alignment and Troubleshooting
Service Manual
ML-551x / 651x series
4-119
Samsung Electronics
5. Check if the photo sensor connector from the COVER-RIGHT is connected properly.
6. Check if the left/right CAM and the ENCORDER are assembled properly.
7. If there is no problem for above steps, reassemble the fuser unit and turn the machine on.
8. If the error persists, download the fi rmware again.
9. If the problem persists, replace the fuser unit with new one.
10. If the problem persists, replace the engine board.