Brother MFC-9840CDW User Manual page 137

Examples of poor print
quality
Coloured 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.
Coloured 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
colours 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.
Recommendation
One of the toner cartridges may be damaged. Replace the toner
cartridge that matches the colour of the streak or bond.
Clean all four corona wires (one for each colour) of the drum unit by
sliding the green tab. (See Cleaning the corona wires on page 162.)
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 181.)
The fuser unit may have a smudge mark. Call Brother or your dealer
for service.
One of the toner cartridges may be damaged. Replace the toner
cartridge that matches the colour of the line.
The drum unit may be damaged. Put in a new drum unit. (See
Replacing the drum unit on page 181.)
Clean all four corona wires (one for each colour) of the drum unit by
sliding the green tab. (See Cleaning the corona wires on page 162.)
Clean the laser scanner windows with a soft cloth. (See Cleaning the
laser scanner windows on page 158.)
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
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 102.)
Clean all four corona wires (one for each colour) of the drum unit by
sliding the green tab. (See Cleaning the corona wires on page 162.)
If the print quality has not improved, put in a new drum unit. (See
Replacing the drum unit on page 181.)
Clean the drum unit. (See Cleaning the drum unit on page 166.)
Make sure that the toner cartridges are installed properly. (See
Replacing a toner cartridge on page 176.)
One of the toner cartridges may be damaged. Identify the missing
colour and put in a new toner cartridge for the colour with the white
line. (See Replacing a toner cartridge on page 176.)
The drum unit may be damaged. Put in a new drum unit. (See
Replacing the drum unit on page 181.)
Troubleshooting and routine maintenance
C
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