Question about Brother MFC 7420 All-In-One Laser Printer

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Vertical black line on all print outs

I've changed the toner, I've cleaned everything, still have the vertical black line from top to bottom of every page, print outs and copies

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1) Check the cartridge. Look at the egg color drum and see if there is any built up toner. If there is then wipe off with soft cloth and reinstall.
2) Does this happen when coping from the flat bed and the doc feeder at the top?
If it it's only from the top then there is a glass lense that might have white out on it.
This is common when using white out and not letting it dry long enough.
To get to the lense it my be tricky but if the top of the feeder open a little from the top pop it open and
the glass is a thin 1/4 strip. Wipe it clean then try again. Hope this helps. Boats

Posted on Oct 07, 2008

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