Samsung ML-4551NR - Periodic Defective Image

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