My 5316 copier keeps blinking F2 and willnot print

F2 - Black toner supply trouble
Try a different toner cart, remember to shake the cart. before installing. Power the machine on and off and check. Check the sealing tape has been fully removed from the cartridge as well as the green colored plug.
Also, if you have an original drum unit frame, change the frame with the new Modified version to prevent arching at the rear cover of the drum unit against the inside back plate of the machine.
Check that the black dev. tank is not low or empty, re-position both drum & dev. tank.


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