Brother MFC-7750 Printer User Manual


 
204
CHAPTER NINETEEN
DIFFICULTY SUGGESTIONS
Vertical streaks appear in Sometimes you may see vertical streaks on your copies.
copies Either the scanner or the primary corona wire for
printing s dirty. Clean them both. (See pages 213 and
215.)
Printouts are too dark or Adjust the print conditions by setting the Print Density
light function. It has been factory set to the middle position.
(See “Setting the Print Density”on page 46.)
Printed pages contain white You may fix this by wiping the scanner windows with a
stripes clean soft cloth. (See “Regular Maintenance” and
“Cleaning the Drum Unit” on pages 213 and 215.) If
you still see white stripes or faint images and the
display shows CHANGE DRUM SOON, replace the
drum unit with a new one.
Printed pages are stained Clean the MFC’s interior and the primary corona wire
with toner or have of the toner cartridge. (See “Regular Maintenance” and
vertical stripes “Cleaning the Drum Unit” on pages 214 and 215.)
Make sure that the tab of the corona wire is at the home
position. If after cleaning, you still see dark stripes or
toner stains and the display shows CHANGE DRUM
SOON, replace the drum unit with a new one.
Printed pages have white Make sure that you use paper that meets the
spots in black text and specifications. Rough surface or thick media can cause
graphic areas the problem. If you still see white spots and the
display shows CHANGE DRUM SOON,
replace the drum unit with a new one.
Toner scatters and stains Adjust the print conditions by setting the Print Density
the printed page function. Remove the drum unit and clean the MFC's
interior. (See “Regular Maintenance”, “Cleaning the
Printer” and “Cleaning the Drum Unit” on pages 213
and 215.) Make sure that you use paper that meets
specifications. (See page 18.) If you still have scattered
toner and the display shows CHANGE DRUM SOON,
replace the drum unit with a new one.
The whole page is printed Wipe the electric terminals referring to page 214. Also,
black do not use heat-sensitive paper as it will cause this
problem. After cleaning, if the printed pages are still
black and the display shows CHANGE DRUM SOON,
replace the drum unit with a new one.
Nothing is printed on the Make sure that the toner cartridge is not empty. Wipe
the page electric terminals referring to “Regular Maintenance”,
“Cleaning the Printer” and “Cleaning the Drum Unit”
on pages 213 and 215. Make sure that a torn piece of
paper does not remain on the scanner window.
Print Quality
Difficulties
Copy Quality
Difficulties
White Stripes or
Faint lmages
Dark Stripes or Toner Stains
White Spots
Scattering Toner
White Page
Black Page