4.1.8 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 Period Phenomenon
1 OPC Drum 188.5mm White and Black Spots
2 Charge Roller 37.7mm Black Spot and line and Periodic Band
3 Supply Roller 32.7mm Periodic Band by little difference of density
4
Developing Roller
26.0mm White Spot, Horizontal black band
5
1
st
Transfer Roller
43.8mm Ghost, Damaged Image by abnormal tranfer
6
2
nd
Transfer Roller
54.64mm Ghost, Damaged Image by abnormal tranfer
7 50.3mm BackgroundPressure Roller
8 86.4mm Black Spots or Vertical Black BandHeat Roller
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