Brother MFC-9440CN User Manual page 133

Examples of poor print
quality
Colored or white spots at
2.95 in. intervals (75 mm)
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
2.95 in. (75 mm)
2.95 in. (75 mm)
Toner scatter or toner stain
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
Gray or colored background
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
Recommendation
a
Dust, paper powder, glue, and so on may stick to the surface of the
photosensitive drum (OPC) and cause colored or white spots to
appear on printed documents.
b
Make five copies of a blank, white sheet of paper. (See Making
multiple copies on page 72.)
c
If you still see the spots down the printed documents at
2.95 in. (75 mm) intervals after you made five copies, clean the
drum unit. (See Cleaning the drum unit on page 155.)
d
If the print quality still has not improved you need to install a new
drum. (See Replacing the drum unit on page 171.)
Check the machine's environment. Conditions such as high humidity
and high temperatures may cause this print quality problem. (See
Choosing a location on page 92.)
Make sure that you use paper that meets our specifications. Rough-
surfaced paper may cause the problem. (See Acceptable paper and
other media on page 12.)
Install a new toner cartridge for the color causing the problem. (See
Replacing a toner cartridge on page 166.)
Clean the corona wires and the drum unit for the color causing the
problem. (See Cleaning the corona wires on page 151 and Cleaning
the drum unit on page 155.) If the print quality has not improved, put
in a new drum unit. (See Replacing the drum unit on page 171.)
Make sure that you use paper that meets our specifications. (See
Acceptable paper and other media on page 12.)
'
Check the machine s environment. Conditions such as high
temperatures and high humidity can increase the amount of
background shading. (See Choosing a location on page 92.)
Install a new toner cartridge for the color causing the problem. (See
Replacing a toner cartridge on page 166.)
Clean the corona wires of the drum unit for the color causing the
problem. (See Cleaning the corona wires on page 151.) If the print
quality has not improved, put in a new drum unit. (See Replacing the
drum unit on page 171.)
Troubleshooting and routine maintenance
C
117