Periodic Defective Image - Samsung ProXpress M337x 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.
No Roller Description
1 1st Pressure roller
2 2nd Pressure roller
3 Heat roller
4 Charge roller
5 Developer roller
6 OPC drum
7 Supply roller
8 Transfer roller
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3
2
1
Band Period
(mm)
62.8 mm
37.7 mm
77.8 mm
34.5 mm
37 mm
76 mm
69.57 mm
47.1 mm
5
4
7
6
8
Phenomenon
Background
Background
Black spot and fuser ghost
Black spot
Horizontal band
White and Black spots
Horizontal band
Ghost, Damaged image
4. Alignment and Troubleshooting
Defective part
Fuser unit
Laser Toner
cartridge or
Imaging Unit
Transfer roller
4-20