Samsung SCX4021S
Troubleshooting. Periodic Defective Image
If an image defects appears at regular intervals on the printed-paper, it is due to a faulty or damaged roller. Refer to the table below and check the condition of the appropriate roller.
| No | Roller | Period (mm) | Phenomenon | Defective part |
|---|---|---|---|---|
| 1 | Pressure Roller | 75.4 mm | Background | Fuser Unit |
| 2 | Heat Roller | 77.6 mm | Black spot and image ghost | |
| 3 | Charging Roller | 37.7mm | Black Spot and line and periodic band | Toner Cartridge |
| 4 | OPC Drum | 75.4mm | White and Black Spots | |
| 5 | Developing Roller | 44.2mm | White spot, Horizontal black band | |
| 6 | Supply Roller | 35.5 mm | Periodic Band by little difference of density | |
| 7 | Transfer Roller | 47.1mm | Ghost, Damaged image by abnormal transfer | Transfer roller |