Brother MFC-9840CDW User Manual page 136

Examples of poor print
quality
Colored streaks or bands down
the page
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
Colored lines across the page
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
White spots or hollow print
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
Completely blank or some
colors are missing.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
120
Recommendation
One of the toner cartridges may be damaged. Replace the toner
cartridge that matches the color of the streak or band. (See Replacing
a toner cartridge on page 169.)
Clean all four corona wires (one for each color) of the drum unit by
sliding the green tab. (See Cleaning the corona wires on page 156.)
Make sure each corona wire's green tab is at the home position (b).
The drum unit may be damaged. Put in a new drum unit. (See
Replacing the drum unit on page 174.)
The fuser unit may have a smudge mark. Call Brother Customer
Service at 1-800-284-4329 (in USA) or 1-877-BROTHER (in
Canada).
One of the toner cartridges may be damaged. Replace the toner
cartridge that matches the color of the line. (See Replacing a toner
cartridge on page 169.)
The drum unit may be damaged. Put in a new drum unit. (See
Replacing the drum unit on page 174.)
Clean all four corona wires (one for each color) of the drum unit by
sliding the green tab. (See Cleaning the corona wires on page 156.)
Clean the laser scanner windows with a soft cloth. (See Cleaning the
laser scanner windows on page 152.)
Make sure that you use paper that meets our specifications. (See
Acceptable paper and other media on page 11.)
Make sure that the recommended paper was used.
Choose Thick paper mode in the printer driver or in the machine's
Paper Type menu setting, or use thinner paper than you are currently
using. (See Paper type on page 22 and Basic tab in the Software
User's Guide on the CD-ROM.)
Change the paper to fresh, unopened paper.
Check the machine's environment. Conditions such as high humidity
can cause hollow print. (See Choosing a location on page 96.)
Clean all four corona wires (one for each color) of the drum unit by
sliding the green tab. (See Cleaning the corona wires on page 156.)
If the print quality has not improved, put in a new drum unit. (See
Replacing the drum unit on page 174.)
Make sure that the toner cartridges are installed properly. (See
Replacing a toner cartridge on page 169.)
One of the toner cartridges may be damaged. Identify the missing
color and put in a new toner cartridge for the color with the white line.
(See Replacing a toner cartridge on page 169.)
The drum unit may be damaged. Put in a new drum unit. (See
Replacing the drum unit on page 174.)