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