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I am getting a quarter inch black streak that runs the entire length on the back of each printed page. Sometimes light and sometimes quite dark. I have tried changing ink cartridges but still get the streak.
Re: I am getting a quarter inch black streak that runs...
You'll have to open up the printer and clean everything off. You probably have a feed roller with ink on it. If you refill, use ONLY inks made for your brand of printer.
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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).
If the streaks are narrow black and run the entire length of the page, replace the soft plastic wiper blade on the drum (and hope the drum is not scratched). Black smudges are related to the toner/developer purity. Replace both.
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. http://www.brother-usa.com/ModelDocuments/Consumer/Users%20Manual/UM_MFC_8500_EN_1354.PDF
If the dark streak appears on printed documents, cleaning the charge wire will correct it.
check your ink levels. if its the ink that came with the printer it is probable running out of ink. they do not give a full cartridge with printers, only about 3rd full. also try cleaning the heads. and try changing your printer settings/prefrences to less ink, more drytime see if that helps.
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.
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