Samsung ML-1665 Service Manual - Page 56
Periodic Defective Image, Roller, Period mm, Phenomenon, Defective part
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Alignment and Troubleshooting 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 OPC Drum Developing Roller Charging Roller Supply Roller Transfer Roller Pressure Roller Fusing Roller Period (mm) 62.9mm 35.1mm 26.7mm 47mm 39.2mm 75.4mm 77.5mm Phenomenon White and Black Spots White spot, Horizontal black band Black Spot and line and periodic band Periodic Band by little difference of density Ghost, Damaged image by abnormal transfer Background Black spot and image ghost Defective part Toner Cartridge Transfer roller Fuser 1 2 3 5 4 6 7 1 Pressure roller 2 Heat roller 3 Charge roller 4 OPC Service Manual 5 Transfer roller 6 Deve roller 7 Supply roller 4-8 Samsung Electronics
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