TROUBLESHOOTING 6 - 14
Black toner marks across
the page
■The drum unit may be damaged. Put in a new drum unit. See Replacing the
drum unit on page 5-9.
■Make sure that you use paper that meets our specifications. See What kind
of paper can I use? on page 1-5.
■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
Cleaning on page 5-12.
■Do not use paper that has clips or staples because they will scratch the
surface of the drum.
■If the unpacked drum unit is in direct sunlight or room light, the unit may be
damaged.
White lines across the page
■Make sure that you use paper that meets our specifications. A rough surfaced
paper or thick print 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. Put in a new drum unit. See Replacing the
drum unit on page 5-9.
Lines across the page
■Clean the inside of the printer and the primary corona wire in the drum unit.
See Cleaning on page 5-12.
■The drum unit may be damaged. Put in a new drum unit. See Replacing the
drum unit on page 5-9.
Black lines down the page
Printed page s hav e toner
stains down the page.
■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 on page 5-9.
■The toner cartridge may be damaged. Put in a new toner cartridge. See
Replaci ng the tone r ca rtri dge on page 5-3. Make sure that a torn piece of
paper is not inside the printer covering the scanner window.
■The fixing unit may be smudged. Call Brother Customer Service.
Examples of poor print
quality Recommendation
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ABCD
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ABCDEFGH
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ABCD
abcde
01234
ABCDEFGH
abcdefghijk
ABCD
abcde
01234
ABCDEFGH
abcdefghijk