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6-8
Alignment & Adjustments
Samsung Electronics
Service
Manual
6.9 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 37.7mm black spot
3 Supply Roller 47.8mm light or dark horizontal image band
4 Developing Roller 35.2mm horizontal image band
5 Transfer Roller 45.3mm image ghost
6 Heat Roller 57.1mm Black spot and image ghost
7 Pressure Roller 59.7mm black spot on the backside
PTL
L S U
Fuser
Toner Cartridge
1
2
3
7
6
5
4
MP Sensor
1
2
3
4
OPC Drum
Charge Roller
Supply Roller
Developing Roller
5
6
7
Tramsfer Roller
Heat Roller
Pressure Roller
SCAN PART
<Rollers Layout>