Brother MFC-8510DN - Manual (Page 121)

Troubleshooting
113
B
Lines across the page
 Clean the corona wire inside the drum unit.
See Cleaning the corona wire uu page 69.
 The drum unit may be damaged. Put in a new drum unit.
See Replacing the drum unit uu page 71.
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.
See Product Safety Guide: Choosing a location.
 If the problem is not solved after printing a few pages, put in a new
drum unit.
See Replacing the drum unit uu page 71.
White Spots on black text
and graphics at 94 mm
intervals
Black Spots at 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 71.
Examples of poor print
quality Recommendation
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4