Samsung ML-331xD - Periodic Defective Image

4. Alignment and Troubleshooting
4-11
Samsung Electronics
Service Manual
ML-331x/371x series
4.1.5 Periodic Defective Image
If an image defects appears at regular intervals on the printed-paper, it is due to a faulty or damaged roller.
Refer to the table below and check the condition of the appropriate roller.
No Roller Description
Band Period
(mm)
Phenomenon Defective part
1 1st Pressure roller Background
Fuser unit2 2nd Pressure roller Background
3 Heat roller Black spot and fuser ghost
4 Charge roller 26.7 mm Black spot
Toner cartridge
5 Developer roller 36.78 mm Horizontal band
6 OPC drum 75.49 mm White and Black spots
7 Supply roller 69.57 mm Horizontal band
8 Transfer roller Ghost, Damaged image
1
3
8
2
7
4
6
5
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA