Question about Brother MFC-8500 All-In-One Laser Printer

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Brother MFC 8500 print issue

I have a 1 inch wide black streak that comes when faxing or copying

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Re: Brother MFC 8500 print issue

Try to clean your print head. I have HP all in one laser and doing that helped once when that happened to me.

Posted on Oct 06, 2007

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Clean the roller and the inside of the machine, asny residue on the roller will cause these black streaks. If cleaning doesn't cure the problem you will need to replace it.

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Brother MFC 8500 print issue


Try cleaning the glass part with a glass cleaner solution with a damp cloth, but if you need instruction how to clean the inside part of it, suggesting you consult a technician or certified servicer for the product to avoid further issue. thanks for using Fixya!

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First guess is you have a bit of dirt (often white-out from people scanning corrected paper that's not quite dry) stuck on the fax scan window. This should be described pretty well in your user manual (which you can download online from

Its also possible that there is dirt (typically loose toner) on the laser scan window (there's a laser that shines through it to get the image pattern on the drum). That window is often along the bottom of the unit under the drum/cartridge (take the cartridge out and look). The Brother manual I've seen seems to ignore this possibility.

Print streaks DO NOT mean cartridge drum replacement in many cases !! On brother Intellifax or MFC or other laser copier/printer/fax, keep in mind that either the fax/copy scan window OR the laser scan window can get dirty. If the fax scan window is dirty, you see streaks on outgoing faxes and copies (but NOT incoming faxes). If the laser scan window is dirty, you see streaks on all prints (copies, faxes, print-from-computer).

Note also that when transporting/moving some laser copier with the toner cartridge inside, the toner can get out and make a big mess inside (including getting the laser scan window dirty). An air compressor can be usefull to blow it out. And sometimes using alcohol to clean is a BAD idea (maybe incompatible with plastic and rubber parts). A damp rag is probably fine.

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1 Answer


Reference page 22-17 in reguards to cleaning the charge wire on the drum unit and page 22-16 for cleaning the document scanner. This is a link to your Brother MFC 8500. Hope this helps.
If the dark streak appears on printed documents, cleaning the charge wire will correct it.

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Hello sir; Either drum cleaning blade or drum cartridge needto replace.

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Hello sir;The streak line from printing also should be from copy, because the line come from imaging unit, check the meter count if close to or over 50,000 then replace drum and drum blade, it will take care the problem.
The brother printer you need to replace imaging unit( drum unit).

Jun 01, 2009 | Brother Printers & Copiers

1 Answer

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lift up your adf and locate the thin piece of glass, about an 1' wide, and clean real good with rag and windex. probably white out or some foreign material on that glass.


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Try taking out the cartidge and given it a light shake. If the white streak moves or changes then you are out of toner.

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1 Answer

Thick Black Line on my copies and faxes

Can't image it being anything but scan glass, if prints are fine, are you sure you cleaning scan glass(inside of where originals are fed)?

If so then scanner lamp faulty, but I've never come across it myself on this model.

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