4.1.7 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 Period (mm) Phenomenon Defective part
OPC Drum 62.9mm White and Black Spots Toner Cartridge
Developing Roller 35.1mm White spot, Horizontal black band
Charging Roller 26.7mm Black Spot and line and periodic band
Supply Roller 47mm Periodic Band by little difference of density
Transfer Roller 39.2mm Ghost, Damaged image by abnormal transfer Transfer roller
Pressure Roller 75.4mm Background Fuser
Fusing Roller 77.5mm Black spot and image ghost
1 Pressure roller 5 Transfer roller
2 Heat roller 6 Deve roller
3 Charge roller 7 Supply roller
4 OPC
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