Periodic Defective Image - Samsung ProXpress M387 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.
2
No Roller Description
1 1st Pressure roller
2 2nd Pressure roller
3 Heat roller
4 Charge roller
5 Developer roller
6 OPC drum
7 Supply roller
8 Transfer roller
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4
3
6
1
8
Band Period
Phenomenon
(mm)
62.8 mm Background
37.7 mm Background
77.8 mm Black spot and fuser ghost
34.5 mm Black spot
37 mm Horizontal band
76 mm White and Black spots
69.57 mm Horizontal band
47.1 mm Ghost, Damaged image
4. Alignment and Troubleshooting
5
7
Defective part
Fuser unit
Laser Toner
cartridge or
Imaging Unit
Transfer roller
4-20