Troubleshooting and routine maintenance125CImproving the print quality CExamples of poor printqualityRecommendationWhite lines across the page Make sure that you use paper that meets our specifications. A roughsurfaced paper or thick print media can cause the problem. (SeeAcceptable paper and other print media on page 15.) Make sure that you choose the appropriate media type in the printerdriver or in the machine’s Paper Type menu setting. (See Acceptablepaper and other print media on page 15 and Basic tab in the SoftwareUser’s Guide.) The problem may disappear by itself. Print multiple pages to clear thisproblem, especially if the machine has not been used for a long time. The drum unit may be damaged. Put in a new drum unit. (SeeReplacing the drum unit on page 158.)White lines down the page Wipe the laser scanner windows with a dry, lint-free soft cloth. (SeeCleaning the laser scanner window on page 149.) Make sure that a torn sheet of paper is not inside the machinecovering the scanner window. The toner cartridge may be damaged. Put in a new toner cartridge.(See Replacing a toner cartridge on page 155.) The drum unit may be damaged. Put in a new drum unit. (SeeReplacing the drum unit on page 158.)Hollow print Make sure that you use paper that meets our specifications. (SeeAcceptable paper and other print media on page 15.) Choose Thick paper mode in the printer driver, choose Thick in themachine’s Paper Type menu setting or use thinner paper than youare currently using. (See Paper Type on page 23 and Basic tab in theSoftware User’s Guide.) Check the machine’s environment. Conditions such as high humiditycan cause hollow print. (See Choosing a location on page 104.) The drum unit may be damaged. Put in a new drum unit. (SeeReplacing the drum unit on page 158.)Gray background Make sure that you use paper that meets our specifications. (SeeAcceptable paper and other print media on page 15.) Check the machine’s environment. Conditions such as hightemperatures and high humidity can increase the amount ofbackground shading. (See Choosing a location on page 104.) The toner cartridge may be damaged. Put in a new toner cartridge.(See Replacing a toner cartridge on page 155.) The drum unit may be damaged. Put in a new drum unit. (SeeReplacing the drum unit on page 158.)ABCDEFGHabcdefghijkA B C Da b c d e0 1 2 3 4ABCDEFGHabcdefghijkA B C Da b c d e0 1 2 3 4ABCDEFGHabcdefghijkA B C Da b c d e0 1 2 3 4
