C6000n User’s Guide150Fading (Vertical)Light PrintPossible cause RemedyLED head is dirty. Clean LED head with lens cleaner or soft tissue.Toner is low. Change toner cartridge.Paper is unsuitable forprinter.Use recommended paper.Possible cause RemedyThe toner cartridge isincorrectly installed.Reinstall the toner cartridge. See “Replace aToner Cartridge” on page 73.Toner is low. Change toner cartridge. See “Replace a TonerCartridge” on page 73.The paper is moist. Store paper within specified temperature andhumidity levels. See “Specifications” onpage 121.Paper is unsuitable forprinter.Use recommended paper. See “Paper (PrintMedia)” on page 10.