Alignment and Adjustments
Service Manual 6-11
6.7 Periodic Defective Image (Repeating Defects)
If a mark or other printing defect occurs at regular intervals down the printed page it may be caused by a damaged or
contaminated roller. Measure the repeating defect and refer to the table below to identify the problem component.
PTL
No Roller Defective image Typical defect
1 OPC Drum 75.5 mm white spot on black image or black spot
2 Charge Roller 37.7 mm black spot
3 Supply Roller 44.9 mm light or dark horizontal image band
4 Developing Roller 35.3 mm horizontal image band
5 Transfer Roller 47.1 mm image ghost
6 Heat Roller 78 mm black spot and image ghost
7 Pressure Roller 75.5 mm black spot on the backside
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