Improving The Print Quality - Brother MFC-9120CN User Manual

Improving the print quality

If you have a print quality problem, print a test page first (Menu, 4, 2, 3). If the printout looks good,
the problem is probably not the machine. Check the interface cable connections or try printing a
different document. If the printout or test page printed from the machine has a quality problem,
check the following steps first. And then, if you still have a print quality problem, check the chart
below and follow the recommendation.
a
Check that you use the paper that meets our specifications. (See Acceptable paper and other
print media on page 17.)
Note
To get the best print quality, we suggest using the recommended paper. (See Recommended
paper and print media on page 17.)
b
Check that the drum units and toner cartridges are installed correctly.
Examples of poor print
quality
White lines, bands or ribbing
across the page
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
Colors are light or unclear on
the whole page
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
Recommendation
Put in a new drum unit. (See Replacing the drum units on page 169.)
You may only need to replace one drum unit to solve the print
problem. To identify which drum needs to be replaced, please visit us
at http://solutions.brother.com/ to view our FAQs and troubleshooting
tips.
Make sure Toner Save mode is off in the control panel of the machine
or the printer driver.
Make sure that you choose the proper media type in the printer driver
or in the machine's Paper Type menu setting. (See Acceptable paper
and other print media on page 17 and Basic tab in the Software
User's Guide on the CD-ROM.)
Shake all four toner cartridges gently.
Wipe the windows of all four LED heads with a dry lint free soft cloth.
(See Cleaning the LED heads on page 152.)
Troubleshooting and routine maintenance
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