User Manual

Troubleshooting
95
B
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 62.)
White Spots on black text and
graphics at 94 mm intervals
Black Spots at 94 mm intervals
 Make ten copies of a blank, white sheet of paper. (See How to
copy uu page 45.) If the problem is not solved, the drum unit may
have glue from a label stuck on the OPC drum surface. 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 62.)
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 16.)
 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 55.)
 The drum unit may be damaged. Put in a new drum unit. (See
Replacing the drum unit uu page 62.)
Examples of poor print quality Recommendation
94 mm
94 mm
94 mm
94 mm
ABCDEFGH
abcdefghijk
ABCD
abcde
01234