Kyocera FS4020 - how do I get it out of envelope mode

SOURCE: how to remove toner drum on the Brother MFC-7840W

http://www.brother-usa.com/manuals/default.aspx?ProductID=MFC7420&ProductGroupID=5&WT.cg_n=Support&WT.cg_s=Manuals

Go to that link and download user manual or read their support pages

SOURCE: Paper Jam Message

Thanks for the solution. I have a oki B4300, same problem.
I opened top, removed toner/drum. On your left, in front, there is metal roller held by springs. Plastic strip is just in front of this. Two square windows under plastic strip should look dark.
In my case, the Left "window "was white. This was a very small piece of paper which also extended under a small, moveable magnetic switch to the far left. I removed this paper by grabbing it (next to the switch) with a pair of surgical forceps, gently twisting it until it could be pulled out. No need to remove any parts. It now is fixed!
Thanks again.

SOURCE: DCP 7020 Brothers laser printer paper jam & back cover open fault

Try doing the following prior to messing around with the fuser itself:

http://welcome.solutions.brother.com/BSC/public/us/us_ot/en/faq/faq/000000/002000/000024/faq002024_006.html?reg=us&c=us_ot&lang=en&prod=mfc7820n_all&Cat=4

SOURCE: HP 3015 Laserjet paper jam error message

The paper is probably jammed between the fuser and the rear cover if you can't see it.

SOURCE: paper jam and toner message - no paper jam and new toner

Had the same problem Look into www.fixyourownorinter.com
Took the Formatter card out, BAKE for 8 minutes at 350F, let it cool, put it back in and VOILA! Put the card fase up and make sure (with screws) it does not touch the pan you used to bake it.
Good luck