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Service Manual
Alignment & Troubleshooting
4-21
4.1.8 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 75.5mm White spot, Block spot
2 Charge Roller 37.7mm Black spot
3 Supply Roller 37.0mm Horizontal density band
4 Develop Roller 35.2mm Horizontal density band
5 Transfer Roller 45.3mm Black side contamination/transfer fault
6 Heat Roller 66.3mm Black spot and fuser ghost
7 Pressure Roller 75.5mm Black side contamination
PTL
P
I
C
K
/
R
PR
CR
DR
SR
TR FR
OPC
L S U
Fuser
Toner Cartridge
MP Sensor
1
2
3
4
OPC Drum
Charge Roller
Supply Roller
Developing Roller
5
6
7
Transfer Roller
Heat Roller
Pressure Roller