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Re: The copies print with 2 white streaks where print...
Pull the toner/drum unit out of the machine. on the top of the drum unit there is ether a blue or green slide lever. move the slide back and fourth 10-15 times. if you have canned air blow out the area where the slide is. reinstall the drum unit see if this works
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Print quality issues on these models is usually if not always down to the cartridges used. I bet you are using compatible cartridges. If so just buy a set of genuine ones and I bet the quality will be perfect again.
don't always believe what they say. just because its "supposed to " last a certain amount of time, doesn't mean it will. Once you get the insides dirty, its hard to get them straight again. Sometimes there is build up on the printer head from a leaky cartridge. I'm just guessing cause I had a similar brand that was brand new act up on me and because I was printing bold it started rolling the paper. I put it on economy printing to save toner and after a few runs, it cleared up. plus using a watermark helped but don't think that will help you in your situation.
Sometimes when I get a streak on one side its from light coming in from somewhere and it thinks its part of the image and prints it. If you make sure that your material is flat and not allowing light to come in or its firmly against the glass it might help.
Are there streaks on the copies you make?? Print out a report or list from your machine and see if the streaks are on the printed pages.
Open the feeder from the top of the machine...you will see a thin strip of glass maybe 1/2" wide running from the rear of the machine to the front..odds are there is glue/dirt/corrector fluid or some other dirt on the glass. Clean this off..once you can make a clean copy you should be sending clean fax's.
If they are black streaks and they are always in the exact same place, open the cover and clean the skinny little scanning glass. It might be ink or lint. If it's white streaks then it's in the same place but it's dried correction tape or fluid, etc.
The green roller is the drum which has a cleaning blade to remove excess toner, when the drum gets older it becomes clogged and will dump toner back out onto the drum. Just some info on it. Best fix is replace the drum, you could take it apart and attempt to dump and clean it but it's rarely worth doing that.
If it is just when you copy and not when you print then it is a cleaning issue. Toner cartridge would cause the line to appear on copies, printouts and faxes. There is a piece of glass inside the auto document feeder that is probably dirty. 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.
It is the fuser at rear giving you grief! The upper heat roller has a teflon coating that wears away allowing toner to stick to roller and smudgin prints as they pass threw it. The fix is to replace fuser assembly, take to brother dealer to fix.
You can prove it to yourself by timing the print to stop mid way threw machine then remove print cartridge and look at paper, you should see a image is good untill it hits the fuser,( pre fused image "rubs off" paper.) If you have changed drum and toner thats all it can be. They all do it in time.
Fuser is hot bit at rear, pull out drum and look in the back with a small torch you will see upper heat roller is worn, guestimation $90 for fuser plus labour to fit.