Samsung Electronics
Service Manual
Alignment and Adjustmens
4-8
4.9 Periodic Defective Image
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 Defective image Typical defect
1 OPC Drum 75.5mm white spot on black image or black spot
2 Charge Roller 37.8mm black spot
3 Supply Roller 44.9mm light or dark horizontal image band
4 Developing Roller 35.2mm horizontal image band
5 Transfer Roller 45.3mm image ghost
6 Heat Roller 64.0mm Black spot and image ghost
7 Pressure Roller 75.3mm black spot on the backside
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