Lexmark Optra C710 Service Manual - Page 156

5016-001 Random Marks Service Check Note: Loose material moving inside the printer and attaching to the photoconductor, ITM Belt, or transfer roll, is the primary cause of random marks. FRU 1 Random Marks Action Check the print cartridges for signs of loose or foreign material that might be on the photoconductor. Check the ITM belt and transfer roll for material stuck to the belt or imbedded in the roll. Residual Image Service Check FRU 1 Print Cartridge 2 Fuser Assembly 3 Erase Lamp Assembly Action The print cartridges can cause a residual image due to a defective cleaning blade, photoconductor or other parts inside the print cartridge. Determine which cartridge is causing the problem. Check the fuser assembly for signs of toner contamination. The hot roll might retain toner deposit on the page. If the cartridges and fuser assembly do not have a problem, go to the "Erase Lamp Service Check" on page 2-50. 2-90 Service Manual