Brother LaserFax IntelliFAX 3550 Owner's Manual page 129

REGULAR MAINTENANCE AND TROUBLESHOOTING
Print Quality Problems
Question
Printouts are too dark or
light.
Printed pages contain white
stripes.
White Stripes or Faint Images
Printed pages are stained
with toner or have vertical
stripes.
--- I ....
Dark Stripes or Toner Stains
Printed pages have white
spots in black text and
graphics area.
m
White Spots
Reconnnendation
Adjust the print conditions by setting the Print Density function,
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 13-12.
You may fix this by wiping the scanner windows with a clean
soft cloth. (See "Regular Maintenance" and "Cleaning the Drum
Unit" on page 13-1~3.)
If the same problem occurs and the display shows CHANGE
DRUM, replace the drum unit with a new one.
• Clean the machine interior and the primary corona wire of
the toner cartridge. See "Regular Maintenance" and "Cleaning
the Drum Unit" on page 13-1-3.
• Make sure that the tab of the corona wire is at the home
position.
If the same print problem occurs and the display shows CHANGE
DRUM, after cleaning, replace the drum unit with a new one.
Make sure that you use paper that meets the specifications.
Rough surface or thick media can cause the problem.
If you still have the same problem and the display shows
CHANGE DRUM, replace the drum unit with a new one.
13-14
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