Periodic Defective Image - Samsung SF-76x series Service Manual

4.1.5. 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.
Roller
1 Pressure Roller
2 Heat Roller
3 Charging Roller
4 OPC Drum
5 Developing Roller
6 Supply Roller
7 Transfer Roller
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Period (mm) Phenomenon
62.8 mm Background
63.7 mm Black spot and image ghost
26.7 mm Black Spot and line and periodic band
62.9 mm White and Black Spots
33.7 mm White spot, Horizontal black band
78.2 mm Periodic Band by little difference of density
39.3 mm Ghost, Damaged image by abnormal
transfer
4. Alignment and Troubleshooting
Defective part
Fuser Unit
Toner Cartridge
Transfer roller
4-8