Service manual

Periodic Defective Image

SM 4-43 M000/M009

Trouble-

shooting

4.7 PERIODIC DEFECTIVE IMAGE

If defective images regularly occur in print-outs, it may be due to a defective or damaged

roller.

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

No Roller Defective image Typical defect

1 OPC Drum 75.5 mm White spots, black spots

2 Charge Roller 26.7 mm Black spots and periodic bands

3 Supply Roller 47.1 mm

Periodic bands with slight

differences in density

4 Developing Roller 35.2 mm White spots, horizontal black bands

5 Transfer Roller 47 mm

Ghosting, damaged image due to

abnormal transfer

6 Heat Roller 77.6 mm Black spots or vertical black bands

7 Pressure Roller_1st 62.8 mm Black background

8 Pressure Roller_2st 37.7 mm Black background

CÓPIA NÃO CONTROLADA