Periodic Defective Image - Samsung ML-4550 Service Manual

Alignment & Adjustments

4.4 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
1 OPC Drum
2 Charge Roller
3 Supply Roller
4 Developing Roller
5 Transfer Roller
6 Heat Roller
7 Pressure Roller
Service Manual
4-18
Defective image
95 mm white spot on black image or black spot, image ghost
38 mm
45 mm
43 mm
55 mm
126 mm
126 mm
1
OPC Drum
2
Charge Roller
3
Supply Roller
4
Developing Roller
<Rollers Layout>
Typical defect
black spot
light or dark horizontal image band
horizontal image band, image ghost
image ghost
Black spot and image ghost
black spot on the backside
5
Transfer Roller
6
Heat Roller
7
Pressure Roller
Samsung Electronics