Brother MFC-8510DN - Manual (Page 122)

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Black toner marks across the
page
 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 Advanced User's Guide: Cleaning the drum unit.
 Make sure that you use paper that meets our specifications.
See Acceptable paper and other print media uu page 18.
 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.
 The toner cartridge may be damaged. Put in a new toner cartridge.
See Replacing the toner cartridge uu page 64.
 The drum unit may be damaged. Put in a new drum unit.
See Replacing the drum unit uu page 71.
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.
See Cleaning the corona wire uu page 69.
 Make sure the green tab of the corona wire is at the home position (a).
 The toner cartridge may be damaged. Put in a new toner cartridge.
See Replacing the toner cartridge uu page 64.
 The drum unit may be damaged. Put in a new drum unit.
See Replacing the drum unit uu page 71.
 The fuser unit may be contaminated.
Call Brother Customer Service.
White lines down the page
 Make sure that foreign material such as a torn piece of paper, sticky
notes or dust is not inside the machine and around the drum unit and
toner cartridge.
 The toner cartridge may be damaged. Put in a new toner cartridge.
See Replacing the toner cartridge uu page 64.
 The drum unit may be damaged. Put in a new drum unit.
See Replacing the drum unit uu page 71.
Examples of poor print
quality Recommendation
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4