Brother MFC9750 owner manual Humidity conditions may cause this condition to occur

T R O U B L E S H O O T I N G A N D M A I N T E N A N C E 61

DIFFICULTY

SUGGESTIONS

Printed pages have white spots in	Make sure that you use paper that meets the specifications. Rough
black text and graphic areas.	surface or thick media can cause the problem. If you still see white spots
	and the display shows CHANGE DRUM SOON, replace the drum unit
	with a new one. Check the machine’s environment; conditions such as
	high humidity may cause this situation to occur.
White Spots
Toner scatters and stains the printed	Adjust the print conditions by setting the Print Density function. Clean
page.	the machine’s interior. See “Regular Maintenance” and “Cleaning the
	Drum Unit” in this chapter. Make sure that you use paper that meets
	specifications. See chap. 5. If you still have scattered toner and the
	display shows CHANGE DRUM SOON, replace the drum unit with a
Scattering Toner	new one. Check the machine’s environment; high temperature and high
	humidity conditions may cause this condition to occur.
The whole page is printed black.	Clean the machine’s interior and the primary corona wire of the drum
	unit. Also, do not use heat-sensitive paper as it will cause this problem.
	After cleaning, if the printed pages are still black or the display shows
	CHANGE DRUM SOON, replace the drum unit with a new one. The
Black Page	drum unit may be damaged.
Nothing is printed on the page.	Make sure that the toner cartridge is not empty. Wipe the electric
	terminals referring to “Regular Maintenance” and “Cleaning the Drum
	Unit” in this chapter. Make sure that a torn piece of paper does not
	remain on the scanner window.
White page
Printed pages are marked regular	Markings may disappear by themselves. Try copying at multiple pages
intervals.	to clear this problem. Markings may occur if the machine has not been
	used for a long time. A possible cause is that the surface of the drum is
	marked or damaged by excessive exposure to light. In this case, replace
Example of Regular Marking	the drum unit with a new one.
Printed pages are blurred at the center	Certain environmental conditions such as humidity, high temperatures,
or at either edge.	etc. may cause this condition to occur. Make sure the machine is placed
	on a flat, horizontal surface. Remove the drum unit with the toner
	cartridge installed. Try rocking them from side to side. You may clear a
	blurred page by wiping the scanner windows with a clean soft cloth. (See
Blurred Page	“Regular Maintenance” and “Cleaning the Drum Unit” in this chapter.) If
	a blurred page occurs after cleaning and the display shows CHANGE
	DRUM SOON, replace the drum unit with a new one.
Ghost images appear on printed page.	Adjust the print conditions by setting the Print Density function. Make
	sure that you use paper that meets the specifications. Rough surfaces or
	thick media can cause a ghost image. Make sure that you select the
	appropriate media type in the printer driver.
Ghost Images

The drum unit is a consumable and it is necessary to replace it periodically, to maintain good printing quality.