Brother MFC-9440CN - Manual (Page 131)

Troubleshooting and routine maintenance
115
C
Colored spots at 2.95 in.
(75 mm)
a
Dust, paper powder, glue, and so on may stick to the surface of the
photosensitive drum (OPC) and cause black or white spots to
appear on printed documents.
b
Make a few copies of a blank, white sheet of paper. (See Making
multiple copies on page 70.)
c
If you still see the spots on printed documents after making multiple
copies, clean the drum unit. (See Cleaning the drum unit on
page 151.)
d
If the print quality still has not improved you need to install a new
drum. (See Replacing the drum unit on page 166.)
Toner scatter or toner stain „ 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 90.)
„ 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 9.)
„ Install a new toner cartridge for the color causing the problem. (See
Replacing a toner cartridge on page 161.)
„ Clean the corona wires and the drum unit for the color causing the
problem. (See Cleaning the corona wires on page 147 and Cleaning
the drum unit on page 151.) If the print quality has not improved, put
in a new drum unit. (See Replacing the drum unit on page 166.)
Gray or colored background „ Make sure that you use paper that meets our specifications. (See
Acceptable paper and other media on page 9.)
„ 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 90.)
„ Install a new toner cartridge for the color causing the problem. (See
Replacing a toner cartridge on page 161.)
„ Clean the corona wires and the drum unit for the color causing the
problem. (See Cleaning the corona wires on page 147 and Cleaning
the drum unit on page 151.) If the print quality has not improved, put
in a new drum unit. (See Replacing the drum unit on page 166.)
Examples of poor print
quality Recommendation
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
75 mm / 2.95 in.
75 mm / 2.95 in.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.