MFC 4550/6550MC/7550MC

OP-US-5.0

TROUBLESHOOTINGPROCEDURES

Print Quality Problems

NOTICE

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 theendofitslife.

Question

 

 

Recommendation

Printoutsaretoodarkor

AdjusttheprintconditionsbysettingthePrintDensityfunction,

light.

 

 

or turn the print density dial counterclockwise for lighter

 

 

 

imagesandclockwisefordarkerimages.Ithasbeenfactoryset

 

 

 

tothemiddleposition.See“ThePrintistooLightortooDark”on

 

 

 

page16-6.

 

 

Printed pages contain

Youmayfixthisbywipingthescannerwindowswithacleansoft

whitestripes.

 

cloth. (See “Regular Maintenance” and “Cleaning the Drum

 

 

 

Unit”onpage14-1~3.)

 

 

 

If the same problem occurs and the display shows CHANGE

 

 

 

DRUM, replace the drum unit with a new one.

White Stripes or Faint

 

lmages

 

 

 

 

 

 

 

Printed

pages

are

• Cleanthemachineinteriorandtheprimarycoronawireofthe

stained with toner or

toner cartridge. See “Regular Maintenance” and “Cleaning

haveverticalstripes.

the Drum Unit” on page 14-1~3.

 

 

 

• 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.

Dark Stripes or Toner

 

Stains

 

 

 

 

 

 

 

Printed

pages

have

Make sure that you use paper that meets the specifications.

whitespotsinblacktext

Rough surface or thick media can cause the problem.

andgraphicsarea.

 

 

 

 

 

If you still have the same problem and the display shows

 

 

 

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

White Spots

16-15

Page 220
Image 220
Brother 6550MC, 7550MC warranty 16-15