Brother MFC4550 PLUS - Manual (Page 183)

Print Quality Difficulties
NOTICE
If the display shows CHANGE DRUM, you can clear a print quality
problem by replacing the drum unit with a new one. The old drum unit is
at the end of its life.
Difficulty Suggestions
Printouts are too dark or
light. Adjust the print conditions by setting the Print Density fimction,
or turn the print density dial counterclockwise for lighter
images and clockwise for darker images. It has been factory set
to the middle position. See “The Print is too Light or too Dark”
on page 162.
Printed pages contain
white stripes.
You may fix this by wiping the scanner windows with a clean soft
cloth. (See “Regular Maintenance” and “Cleaning the Drum
Unit” on pagcD 111 143.)
If you still see white stripes or faint images and the display
shows CHANGE DRUM, replace the drum unit with a now on©.
White Stripes or Faint
Images
Printed pages are
stained with toner or
have vertical stripes.
• Clean the MFC’s interior and the primary corona wire of the
toner cartridge. See “Regular Maintenance” and “Cleaning
the Drum Unit” on pages 141-143.
• Make sure that the tab of the corona wire is at the home
position.
If you still see dark stripes or toner stains and the display shows
CHANGE DRUM after cleaning, replace the drum unit with a
new one.
Dark Stripes or Toner
Stains
Printed pages have
white spots in black text
and graphics area.
O
Make sure that you use paper that meets the specifications.
Rough surface or thick media can cause the problem.
If you still see white spots and the display shows CHANGE
DRUM, replace the drum unit with a new one.
White Spots
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