Examples of poor print quality Recommendation
Black spots at 94 mm intervals
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.
• 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.
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.
White lines down the page
• 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.
Image skewed
• Set the document correctly in the ADF or on the
scanner glass if the skew only occurs when making
copies.
• Make sure the paper or other print media is loaded
correctly in the paper tray and the guides are not too
tight or too loose against the paper stack.
• Set the paper guides correctly.
• The paper tray may be too full.
• Check the paper type and quality.
• Check for loose objects such as torn paper inside the
machine.
• If the problem only occurs during automatic 2-sided
printing, check for torn paper in the 2-sided tray. Verify
477
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