Brother HL-L6250DW Online User's Manual page 267

Examples of poor print quality
White Spots on black text and graphics at 3.7 in. (94 mm)
Black spots at 3.7 in. (94 mm) intervals
Black toner marks across the page
Black lines down the page
Printed pages have toner stains down the page
White lines down the page
intervals
Recommendation
• If the problem is not solved after printing a few 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.
• The drum unit may be damaged.
Replace the drum unit with a new drum unit.
• 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.
• 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.
• 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
• Make sure foreign material such as a torn piece of
paper, sticky notes or dust is not inside the machine
and around the toner cartridge and 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.
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