Periodic Defective Image - Samsung SL-C2670FW Service Manual

4. Alignment and Troubleshooting

4.1.4. 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 T1 roller
8 T2 roller
4-15
Period (mm) Phenomenon
69 mm Background
75.4 mm Black spot and image ghost
26.7 mm Black Spot and line and periodic band
75.4 mm White and Black Spots
27.4 mm (K) White spot, Horizontal black band
27.5 mm
(YMC)
37 mm (K) Periodic Band by little difference of density
37.2 mm
(YMC)
25 mm Ghost, Damaged image by abnormal transfer
56.4 mm Ghost, Damaged image by abnormal transfer
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Defective part
Fuser
Toner Cartridge
ITB unit
T2 roller