To clarify, is this the document that you used to troubleshoot the issue? If not, I would look over it for any steps that might not yet been performed and do those steps.
If after that, one is still having the problem, I would do a hard reset to the printer. No use settings are lost with a hard reset. 1. With the printer plugged directly into a wall outlet, and turned on, unplug the cord from the rear of the printer. 2. Then unplug the cord from the wall socket. 3. Wait at least 30-60 seconds 4. Plug the power cord back into the wall socket first. If the cord has a module in it, make sure that the light on the module is lit up and then plug cord back into the rear of the printer 5. The printer should power back on by itself, but if not use the power button on front panel to turn machine back on.