Troubleshooting > 141D EALING WITH UNSATISFACTORY PRINTINGSYMPTOMS POSSIBLE CAUSES STEPS TO TAKEVertical white lines canbe seen on the printedpage.The LED head is dirty. Wipe the LED head with a soft,lint-free cloth.The toner is low. Open the output tray and tap thecartridge a few times to evenlydistribute any remaining toner. Ifsymptoms persist, replace thetoner cartridge.Foreign materials may bepresent in the image drum.Replace the image drumcartridge.Light-shielding film of theimage drum cartridge is dirty.Wipe the film with a soft, lint-free cloth.Printed images arefading vertically.The LED head is dirty. Wipe the LED head with a soft,lint-free cloth.The toner is low. Open the output tray and tap thecartridge a few times to evenlydistribute any remaining toner. Ifsymptoms persist, replace thetoner cartridge.The paper is not suitable forthe printer unit.Use recommended paper.Printing is light. The toner cartridge is notproperly seated.Reinstall the toner cartridge.The toner is low. Open the output tray and tap thecartridge a few times to evenlydistribute any remaining toner. Ifsymptoms persist, replace thetoner cartridge.The paper is moist. Use paper stored in propertemperature and humidityconditions.The paper is not suitable forthe printer unit.Use recommended paper.Thickness and type of paperare inappropriate.Set the correct value of mediatype and media weight in theMedia menu or set one valuethicker for media weight.Recycled paper is being used. Set one value thicker for mediaweight in the Media menu.Partially faded images.White spots and linesappear in solidprinting.Paper is moist or dry. Use paper stored in propertemperature and humidityconditions.Vertical lines appear. The image drum cartridge isdamaged.Replace the image drumcartridge.The toner is low. Open the output tray and tap thecartridge a few times to evenlydistribute any remaining toner. Ifsymptoms persist, replace thetoner cartridge.