Hello, I have tried everything to clear the ADF jam error. that reads: Jam in the Document Feeder". I ran thin cardboard through several times, there is no paper up in there. Checked the sep pad and rollers, even replaced the pad with a known good pad. Nothing helps. Sometimes it will go away when I have done something fiddling around with the sensor arms but it still comes back almost immediately. Could this be a bad sensor? If so I am not sure which one. Would the 050-907 code help narrow it down? I checked the manual and this code is not in there! Thanks for any help!