Scanner/Printer imageCLASS MF6550

Just, Change the fuser film sleeve or Fuser Unit.
you will have a new ImageCLASS

On what operation are you receiving the black line in your paper?

This problem usually appears when you try to scan or copy using your ADF (automatic document feeder).
To remove this black line in your paper, clean the ADF platen glass in your printer and do as well in the flatbed scanner glass. This ADF platen glass can be found right below where the documents in the ADF goes through. Its a glass about 1 inch in with and beside the flatbed scanner glass (the one where your documents is lay down for copying and scanning. Dried ink or paper residue sticked in the glass can cause this line in the paper. Clean it with a a clothe and spray some windex on it.

Good luck!

Clean the platen glass with a softh cloth. Obvious, Isn't it?

Do you see the same smudge mark if you lay the original on the platen rather than using the document feeder? If it only shows when using the document feeder, clean the scanning glass for the document feeder. It's the small glass to the left of the main glass with the cover open. Use a damp cloth and clean off any dirt or white-out.

open the document lid. Check to see if there is white-out on the glass platen where the document rides across the scanner. Some units require the white roll to be taken off.
sometimes a black mark on this platen can leave black streaks on copies made on this machine, and even when they send to others.
Try to clean the platen glass.

It is a cleaning issue. There is a piece of glass about an inch wide that is next to the platen glass or inside the auto document feeder that is probably dirty depending on your model. Open up the document feeder as if you were clearing an original document jam. Look for a piece of glass inside the ADF, it will run the length of the document feeder. There is probably some dirt or another popular problem is white out. Clean off the glass with glass cleaner or alcohol and it should fix the problem.

You accually need a new fuser unit and to take it out its quite a mission.

you need to remove in this order:

the drum unit
the left panel holding the glass
the glass

where the scanner is there is a black thin guide holding the ribbon cable...take that off.

the display panel
bottom left side panel
bottom read side panel
bottom top panel

flip over the black milar cover over the power supply.

disconect the 3 cables

move the platern about half way and you will see the holes on top of the platen aligned to the bottom so to get to the 3 screws holding the fuser unit.

undo the screws with a long star screw driver and slowly wigle the fuser out.

to put it back you do everything in the opposite order.

Good luck

You should try changing the toner cartridges first. There may be something stuck in it causing the noise and streaking

hello,first of all,make a copy true the adf,and the next on the platen glass,if both copys are good,then the problem is inside the machine,i.e.drum unit or fuser roller damage.
if the strikes only occurs,by using the adf,then cleaning the scanner platen glass,it is the small glass unit!!! on the left side,from the big platen glass..

good luck Sjeuf

Even a single grain of dust or a single strand of hair on the scanning glass will cause the scan head to perceive ink/image where there is none. Deffinetly try cleaning the glass using a good window cleaner, and a cloth that is completely clean, or even a peice of newspaper. If the black line remains, I would suggest taking it into a service center to have the scan head itself cleaned.