Brother DCP9040CN - Manual (Page 53)

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Troubleshooting
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If you think there is a problem with your machine, check the chart below and follow the
troubleshooting tips.
Most problems can be easily resolved by yourself. If you need additional help, the Brother
Solutions Center offers the latest FAQs and troubleshooting tips. Visit us at
http://solutions.brother.com/.
Solutions to common problems
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If you think there is a problem, make a copy first. If the copy looks good, the problem is probably
not your machine. Check the chart below and follow the troubleshooting tips. You can solve most
problems by yourself.
Troubleshooting and routine
maintenance
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Menu access difficulties
Difficulties Suggestions
Key operations do not work Check that the control panel is fitted correctly on the machine. Reinstall the control
panel.
Copy quality difficulties
Difficulties Suggestions
Vertical black line appears in
copies. Black vertical lines on copies are typically caused by dirt or correction fluid on the
glass strip, or one of the corona wires for printing is dirty. (See Cleaning the
scanner on page 77 and Cleaning the corona wires on page 82.)