My Panasonic KX-FL511 keeps showing up with a "Check Document" error message even when the paper path is clear and after I have thoroughly cleaned the transfer rollers/document path rollers.
Look for a switch trapped down in the document feeder
"reset code of check document problem in canon iR2016J
Looking from the back of the fax machine, there should be a black plastic piece just to the right of the center of the document feeder. If you can't see it, it may be stuck in the up position in the square opening. Get a piece of wire (coat hanger) and dislodge it from the up position and that should solve the problem.
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