Service manual

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-128

Samsung Electronics

* Reassemble the fuser unit. Turn the machine off then on. If the problem persists, go to the next step.

6. Check if the thermistor connector on the engine board is connected properly.

7. Check if the FDB connector is connected properly.

8. If there is no problem, upgrade the latest ﬁ rmware.