4. Alignment and 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.
2
1
7
4
5
6
3
Roller
Period (mm)
Phenomenon
Defective part
1
Pressure Roller
75.4 mm
Background
2
Heat Roller
77.6 mm
Black spot and image ghost
Fuser
3
Charging Roller
26.7 mm
Black Spot and line and periodic band
4
OPC Drum
75.49 mm
White and Black Spots
5
Developing Roller
36.75 mm
White spot, Horizontal black band
6
Supply Roller
63.22 mm
Periodic Band by little difference of density
Toner Cartridge
7
Transfer Roller
47.12 mm
Ghost, Damaged image by abnormal transfer
Transfer roller
4-13
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