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Sometimes the drum gets dirty with grease,stickers or something else. To clean it, often it is not necessary to disassemble the toner cartridge and remove the OPC drum. The drum is this metal roller,often green or brown in color. Get a soft cloth, or cotton. Dampen the cloth with isopropyl alcohol. Locate the dirt patch on the drum surface. Rotate the drum through its gears or by pressing on the side areas. Be sure you rotate the drum in the direction of printing. if you rotate the OPC drum in the opposite direction, you could damage the gearsand the cleaning blade. The right direction is that of the path of the sheet of paper. You can use the toner roller as a reference. the direction is this one. If the drum is particularly hard to turn by hand, you can help yourself with a screwdriver. be careful not to damage the gear teeth. Using the cloth dampened with isopropylalcohol, clean the dirty area. Do not touch the OPC drum with your fingers. You can also clean the whole OP