White Spots; White Stripes or Faint lmages; Dark Stripes or Toner Stains- Page 128

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REGULAR MAINTENANCE AND TROUBLESHOOTING

3550-US-5.0

NOTICE

Recommendation

Printouts are too dark or
light.

Question

You will clear a print quality problem by replacing the drum unit with a new one if
the display will show CHANGE DRUM. The old drum unit is at the end of its life.

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.

Printed pages contain white
stripes.

Printed pages are stained
with toner or have vertical
stripes.

White Stripes or Faint lmages

Dark Stripes or Toner Stains

White Spots

Printed pages have white
spots in black text and
graphics area.

Print Quality Problems