Brother MFC-8670DN User Manual page 125

Examples of poor print
quality
Hollow print
All black
White Spots on black text
and graphics at 3.7 in.
(94 mm) intervals
Black Spots at 3.7 in. (94 mm)
intervals
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
Black toner marks across the
page
Recommendation
Make sure that you use paper that meets our specifications. (See
Acceptable paper and other media
Choose Thick paper mode in the printer driver or in the machine
Type menu setting, or use thinner paper than you are currently using. (See
Paper Type
on page 18 and Basic tab in the Software User
-
CD ROM.)
'
Check the machine s environment. Conditions such as high humidity can
cause hollow print. (See
Clean the primary corona wire on the drum unit. (See
wire
on page 130.) If the print quality has not improved, put in a new drum unit.
Replacing the drum unit (DR-520)
(See
Clean the primary corona wire on the drum unit. (See
wire
on page 130.) If the print quality has not improved, put in a new drum unit.
Replacing the drum unit (DR-520)
(See
The drum unit may be damaged. Put in a new drum unit. (See
drum unit (DR-520)
on page 135.)
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.
Make a few copies of a blank, white sheet of paper. (See
copies
on page 76.)
If you still see the spots on printed documents after making multiple copies, clean
Cleaning the drum unit
the drum unit (see
If the print quality still has not improved you need to install a new drum. (See
Replacing the drum unit (DR-520)
Make sure that you use paper that meets our specifications. (See
Acceptable paper and other media
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
Cleaning the drum unit
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 drum unit may be damaged. Put in a new drum unit. (See
drum unit (DR-520)
on page 135.)
Troubleshooting and routine maintenance
on page 12.)
Choosing a location
on page 88.)
on page 135.)
on page 135.)
on page 131).
on page 135.)
on page 12.)
on page 131.)
'
s Paper
'
s Guide on the
Cleaning the corona
Cleaning the corona
Replacing the
Making multiple
Replacing the
111