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Re: new toner but still have dark streaks
IF YOU ARE ONLY GETTING THE LINES WHEN YOU PUT THE DOCUMENTS INTO THE TOP FEEDER AND NOT FROM PRINTNG TO COPIER OR IF YOU PUT A COPY ON THE GLASS UNDER THE DOC FEEDER AND NO LINES APEAR CHECK THE SMALL GLASS WINDOW UNDER THE DOC FEEDER THERE MAY BE SOME TIPEX OR INK RUBBED OFF AND LEFT ON THE GLASS THERE.. THISD MIGHT BE CAUSING THE STREAKS YOU CAN CHECK THIS BY PUTTING THE PAGE IN THE DOC FEEDER AND DOING A COPY AND THEN PUT IT ON THE GLASS PLATE UNDER THE LID AND DO A COPY OR IF HOOKED UP TO COMPUTER DO A PRINT JOB.. IN NO STEAK APPEARS YOU CAN BE SURE ITS ON THE THIN SCANNER GLASS.. GOOD LUCK ...a
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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.
you need to clean the rollers. consult the manual about cleaning the copier. if you don't have a manual, then get some methyl alcohol (any alcohol that evaporates completely will do). use a lint free cloth to rub a small amount of alcohol on all roller surfaces (accessible via pull-down compartments on front and back, usually).
I tried all of the above but nothing worked. Brother's support didn't help either. I changed drums and toner cartridges to no avail. My copier is a MFC 8640D, but this should work on most laser printers. I fixed my problem with a very simple solution, that I didn't find posted anywhere else. I removed the toner/drum unit (easy to do) and looked at the top of the bay where it was located. There is a recessed glass strip running the width of the opening that the laser uses to copy the image to the drum. I wiped it with a soft cloth and removed some toner residue, and then used a q-tip to further clean the entire length of the glass strip (it's called the laser prism). This removed the residue and my copies were crisper and the white streaks were gone. Hope this helps someone and saves you some time.
If it is just with copies, then you have either dirty optics or dirty glass which you must clean. However, most likely the problem is with the imaging drum. If you are able to remove the drum, I suggest cleaning it with soft cloth or rag, then reinsert and see if the problem persists. If the issue does not go away, then I would suggest having a technician coming out and seeing if you need the drum replaced.
If this is only happening with copies and not straight prints, it is possible that the problem is with the scanning unit. Use the soft cloth to clean the scanner area to the left side of the machine where pages are scanned when run through the page feeder. A spec of dust or other debris in this area will appear as a streak along the length of the page.
If it occurs on all prints, You may need to replace the drum or clean the fuser unit.
Dirt on the narrow glass will cause streaks through the Auto feeder, but copies should be clean if using the main contact glass if that's the case. Dirt/toner anywhere else (ie:laser optics) would cause light areas on the copies- not dark. Did this happen the very first time you used it, or shortly after? In other words, could it be coincidental? It sounds more to me, like the PCU (photoconductor/drum unit) needs replacement, or a fuser roller. If cleaning the glass doesn't help, then one of these 2 things is causing your problem.
Replace the Drum Unit, Do you know how to rebuilt this unit, if not you can get an after market product, The Drum unit release is in the Middle of the Copiers you will see a door , open the door, then ONLY , and i do mean ONLY, touch the "Green" release lever for the drum take it out and replace it or rebuilt it f you now how, if this does solve it, which i am certain it will but, if it doesn't something is wrong with the fusing unit and needs to be dismantled, wish i could give you our contact info however, been informed not too so sorry. rules of fixya.com