124 C H A P T E R F I F T E E N

DIFFICULTY

SUGGESTIONS

Print Quality Difficulties

 

 

 

Printouts are too dark or light

Adjust the print conditions by setting the Print Density function, It has

 

been factory set to the middle position. See “Setting the Print Density” in

 

chap. 6.

 

 

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” in this

 

chapter.) If you still see white stripes or faint images and the display

 

shows CHANGE DRUM SOON, replace the drum unit with a new one.

White Stripes or

Check the machine’s environment. Conditions such as humidity, high

Faint lmages

temperatures, etc. may cause this print defect to occur.

 

 

Printed pages are stained with toner

Clean the machine’s interior and the primary corona wire of drum unit.

or have vertical stripes.

See “Regular Maintenance” and “Cleaning the Drum Unit” in this

 

chapter. 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.

Dark Stripes or Toner Stains

 

 

 

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. 12. 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.

 

 

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Brother MFC-9870 manual Print Quality Difficulties