Samsung WC-M15i Series Service Manual page 77

Troubleshooting
Error code 3-090
Fault Ear-splitting noise or allophone
Description
While operating, ear-splitting noise occurs.
Check
LSU motor, Main motor bracket, Fan, Developer, Fuser gear
Cause
1. Defective LSU motor and main motor bracket, or defective harness
2. Foreign materials in the fuser gear or developer
Solution
1-1. Replace the LSU, if defective.
1-2. Check the main motor bracket or its wiring harness.
1-3. Check pick-up ass'y rolls.
2. Reassemble or replace the fuser and developer if defective.
Remark
Others
5-40
Model ML-6100
Samsung Electronics