4.1.3 Abnormal Image Printing and Defective Roller
If a mark or other printing defect occurs at regular intervals down the page it may be caused by a damaged
or contaminated roller. Measure the repetition interval and refer to the table below to identify the roller
concerned.
No Roller Abnormal image period Kind of abnormal image
1 OPC Drum 94.30mm White spot, Block spot
2 Charge Roller 43.96mm Black spot
3 Develop Roller 39.25mm Horizontal density band
4 Transfer Roller 57.14mm Black side contamination/transfer fault
5 Heat Roller 125.6mm Black spot and fuser ghost
6 Pressure Roller 157mm Black side contamination
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