Brother HL-5450DN - Page 149

142
Troubleshooting
6
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.
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 103
White Spots on black text and
graphics at 94 mm intervals
Black Spots at 94 mm intervals
 If the problem is not solved after printing a few 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 112
 The drum unit may be damaged. Put in a new drum unit.
uu Replacing the drum unit uu page 103
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.
uu Cleaning the drum unit uu page 112
 Make sure that you use paper that meets our specifications.
uu Acceptable paper and other print media uu page 2
 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.
uu Replacing the toner cartridge uu page 95
 The drum unit may be damaged. Put in a new drum unit.
uu Replacing the drum unit uu page 103
Examples of poor print quality Recommendation
ABCDEFGH
abcdefghijk
ABCD
abcde
01234