Question about Brother MFC 7420 All-In-One Laser Printer
We (myself and 3 other psychotherapists) have a desktop photocopier/fax/printer, which has begun to make 3 dark, close-together vertical lines through any copies that are run through the feeder, and on any faxes we receive. This doesn't happen on copies made on the glass platen.
I took out the toner cartridge, shook it, ran the cleaning thingy back and forth a few times, but no change. (This also happened on our previous copier, which was a small HP inkjet machine.)
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