Brother MFC-8520DN User Manual page 133

Examples of poor print
quality
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
Lines across the page
White lines, bands or ribbing
across the page
White Spots on black text
and graphics at 94 mm
intervals
Black Spots at 94 mm
intervals
Recommendation
 Clean the corona wire inside the drum unit.
uu Cleaning the corona wire uu page 80
 The drum unit may be damaged. Put in a new drum unit.
uu Replacing the drum unit uu page 72
 Check the machine's environment. Conditions such as high humidity
and high temperatures may cause this print quality problem.
uu Product Safety Guide: Choose a safe location for your product
 If the problem is not solved after printing a few pages, put in a new
drum unit.
uu Replacing the drum unit uu page 72
 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.
uu Cleaning the drum unit uu page 82
 The drum unit may be damaged. Put in a new drum unit.
uu Replacing the drum unit uu page 72
Troubleshooting
B
125