Service manual

Adjustment and Troubleshooting

4-11

Service Manual

4.1.4 Periodic Defective Image

If the delinquent image regularly occurs in the printed-paper, it is due to delinquent or damaged roller.

Refer to the table in below and check the condition of the roller.

No Roller Defective image Typical defect

1 OPC Drum 94.4 mm

White and Black Spots

2 Charge Roller 38.3 mm

Black Spot and Periodic Band

3 Supply Roller 59.1 mm

Periodic Band by little difference of density

4 Developing Roller 50.3 mm

White Spot, Horizontal black band

5 Transfer Roller 55.9 mm

Ghost, Damaged Image by abnormal transfer

6 Heat Roller 125.6 mm Black Spots or Vertical Black Band

7 Pressure Roller 125.6 mm Background

OPC Drum

Charge Roller

Supply Roller

Developing Roller

Transfer Roller

Heat Roller

Pressure Roller