Periodic Defective Image - Samsung ML-451 Series Service Manual

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.
Roller
1 Pressure Roller
2 Charging Roller
3 Magnetic Roller
4 OPC Drum
5 Transfer Roller
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1
Period (mm)
44 mm
56.6 mm
94.2 mm
56.5 mm
Phenomenon
Background
Black Spot and line and periodic band
White spot, Horizontal black band
White and Black Spots
Ghost, Damaged image by abnormal
transfer
4. Alignment and Troubleshooting
Defective part
Fuser
Imaging unit
Transfer roller
4-18