Brother MFC-8510DN Basic User's Manual page 130

Examples of poor print
quality
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
White lines across the page
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
118
Recommendation
 Make sure that you use paper that meets our specifications. A rough
surfaced paper or thick print media can cause this problem.
See Acceptable paper and other print media uu page 19.
 Make sure that you choose the appropriate media type in the printer
driver or in the machine's Paper Type menu setting.
See Paper Type uu page 16.
See Software User's Guide: Printing (for Windows
See Software User's Guide: Printing and Faxing (for Macintosh).
 The problem may disappear by itself. Print multiple blank pages to
clear this problem, especially if the machine has not been used for a
long time.
 The drum unit may be damaged. Put in a new drum unit.
SeeReplacing the drum unit uu page 76.
 Clean the corona wire inside the drum unit.
See Cleaning the corona wire uu page 74.
 The drum unit may be damaged. Put in a new drum unit.
See Replacing the drum unit uu page 76.
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 76.
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