Troubleshooting
70
6
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 49.
Make sure that you use paper that meets our specifications. See What kind of
paper can I use? on page 4.
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 page 69.
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 49.
Lines across the page
Clean the inside of the printer and the primary corona wire in the drum unit. See
Cleaning on page 52.
The drum unit may be damaged. Put in a new drum unit. See Replacing the drum
unit on page 49.
Black lines down the page
Printed pages have toner stains
down the page.
Clean the primary corona wire of the drum unit. See Cleaning the corona wire
on page 56.
Make sure the primary corona wire cleaner is at the home position (a).
The drum unit may be damaged. Install a new drum unit. See Replacing the drum
unit on page 49.
The toner cartridge may be damaged. Put in a new toner cartridge. See
Replacing the toner cartridge on page 44. Make sure that a torn piece of paper is
not inside the printer covering the scanner window.
The fuser unit may be smudged. Call your dealer or Brother Customer Service.
Examples of poor print
quality
Recommendation
ABCDEFGH
abcdefghijk
ABCD
abcde
01234
ABCDEFGH
abcdefghijk
ABCD
abcde
01234
ABCDEFGH
abcdefghijk
ABCD
abcde
01234
ABCDEFGH
abcdefghijk
ABCD
abcde
01234
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