Troubleshooting > 158D 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 asoft, lint-free cloth.The toner is low. Open the top cover and tapthe cartridge a few times toevenly distribute anyremaining toner. Ifsymptoms persist, replacethe toner 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 asoft, lint-free cloth.The toner is low. Open the top cover and tapthe cartridge a few times toevenly distribute anyremaining toner. Ifsymptoms persist, replacethe toner 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 top cover and tapthe cartridge a few times toevenly distribute anyremaining toner. Ifsymptoms persist, replacethe toner 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 a proper value for MediaWeight and Media Type inthe Paper Setup menu, orset one value thicker forMedia Weight.Recycled paper is being used. Set one value thicker forMedia Weight in the PaperSetup menu.Partially faded images.White spots and linesappear in solidprinting.Paper is moist or dry. Use paper stored in propertemperature and humidityconditions.