Brother MFC-8510DN - Manual (Page 131)

Troubleshooting
119
B
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 Advanced User's Guide: Cleaning the drum unit.
 The drum unit may be damaged. Put in a new drum unit.
See Replacing the drum unit uu page 76.
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 19.
 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 68.
 The drum unit may be damaged. Put in a new drum unit.
See Replacing the drum unit uu page 76.
Examples of poor print
quality Recommendation
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4