Lexmark E320 Service Manual - Page 118
Heavy background, background. This is more noticeable as the toner cartridge nears
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4500 Heavy background Poor development or poorly charged toner particles cause excessive background. This is more noticeable as the toner cartridge nears end-of-life. FRU Toner cartridge (not a FRU) HVPS contacts HVPS board Engine board Controller card Action Make sure the toner cartridge is correctly installed and the high voltage contacts are clean. If the cartridge is installed correctly, try a new cartridge. Check the contacts for correct installation and contamination where contact is made with the toner cartridge and HVPS board. Clean as necessary. If this does not correct the problem, replace the following FRUs one at a time in the order shown: • HVPS board • Engine board (E220/E321/E322) or • Controller card (E220/E321/E323) 2-88 Service Manual