CHAPTER 6 TROUBLESHOOTING
Image Defect Samples
ABCDEFGH 
abcdefghijk
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Black Horizontal repetitive
defects
Toner scatters and stains the printed page.
ABCDEFGH abcdefghijk
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White horizontal stripes
ABCDEFGH
abcdefghijk
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Horizontal Lines
Recommendation
•The drum unit may be damaged. Install a new drum unit. See "Replacing the Drum Unit" in Chapter 5.
•Make sure that you use paper that meets specifications. See “What Kind of Paper can I Use?” in Chapter 1.
✏Note
•If you use label sheets for laser printers, the glue from the sheets may sometimes stick to the OPC drum surface. Clean the drum unit. See “Improving the Print Quality” in this chapter.
•Do not use paper that has clips or staples because they will scratch the surface of the drum.
•If the unpacked drum unit is subject to excessive direct sunlight or room light, the unit may be damaged.
•Make sure that you use paper that meets the specifications. A rough surfaced paper or thick media can cause the problem.
•Make sure that you select the appropriate media type in the printer driver.
•The problem may disappear by itself. Try printing multiple pages to clear this problem, especially if the printer has not been used for a long time.
•The drum unit may be damaged. Install a new drum unit. See "Replacing the Drum Unit" in Chapter 5.
•Clean the printer interior and the primary corona wire in the drum unit. See "Cleaning" in Chapter 5.
•The drum unit may be damaged. Install a new drum unit. See "Replacing the Drum Unit" in Chapter 5.
ABCDEFGH abcdefghijk
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Black Vertical lines
Printed pages are stained with toner or have vertical stripes.
•Clean the primary corona wire of the drum unit. See "Cleaning" in Chapter 5.
•Make sure the primary corona wire cleaner is at the Home position (▲).
•The drum unit may be damaged. Install a new drum unit. See "Replacing the Drum Unit" in Chapter 5.
•The toner cartridge may be damaged. Install a new toner cartridge. See "Replacing the Toner Cartridge" in Chapter 5. Make sure that a torn piece of paper is not inside the printer covering the scanner window.
•The fixing unit may be smudged. Call Customer Support.