User's Manual

Examples of poor print quality Recommendation
White lines, bands or ribbing across the page
• Check the machine's environment. Conditions such as
high humidity and high temperatures may cause this
print quality problem.
• Clean the drum unit.
• If the problem is not solved after printing a few pages,
replace the drum unit with a new drum unit.
White Spots on black text and graphics at 3.7 in. (94 mm)
intervals
Black spots at 3.7 in. (94 mm) intervals
• Make 10-15 copies of a blank, white sheet of paper. If
the problem is not solved after printing the blank
pages, the drum unit may have foreign material, such
as glue from a label, stuck on the drum. Clean the
drum unit.
See Related Information:Clean the Drum Unit Using
Drum Dot Print.
• The drum unit may be damaged.
Replace the drum unit with a new drum unit.
ABCDEFGH
abcdefghijk
A B C D 
a b c d e 
0 1 2 3 4
Black toner marks across the page
• If you use label sheets for laser printers, the glue from
the sheets may sometimes stick to the drum surface.
Clean the drum unit.
See Related Information:Clean the Drum Unit Using
Drum Dot Print.
• If you used paper that has clips or staples, the drum
unit may be damaged.
• If the unpacked drum unit is in direct sunlight (or room
light for long periods of time), the unit may be
damaged.
• Clean the drum unit.
• The toner cartridge may be damaged.
Replace the toner cartridge with a new toner cartridge.
• The drum unit may be damaged.
Replace the drum unit with a new drum unit.
ABCDEFGH
abcdefgh ijk
A B C D 
a b c d e 
0 1 2 3 4
Black lines down the page
Printed pages have toner stains down the page
• Clean the corona wire inside the drum unit by sliding
the green tab.
Make sure that the green tab on the drum unit is in the
Home position.
• The toner cartridge may be damaged.
Replace the toner cartridge with a new toner cartridge.
• The drum unit may be damaged.
Replace the drum unit with a new drum unit.
• The fuser unit may be contaminated.
Contact Brother Customer Service.
In USA: 1-877-BROTHER (1-877-276-8437)
In Canada:
www.brother.ca/support
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