Troubleshooting • 133Print Quality ProblemsLongitudinal white stripesLongitudinal fadingFaint printingRemedyClean LED head with lens cleaner or soft tissue.Change toner cartridge(see “Toner CartridgeReplacement” on page 72).Change image drum(see “Image DrumReplacement” on page 80).Possible cause RemedyLED head is dirty. Clean LED head with lens cleaner or soft tissue.Toner is low. Change toner cartridge(see “Toner CartridgeReplacement” on page 72).Paper is unsuitable forprinter.Use recommended paper.Possible cause RemedyThe toner cartridge isincorrectly installed.Reinstall the toner cartridge (see “Toner CartridgeReplacement” on page 72).