FLAG PAPER SENSOR is in there and when paper is pulled downwards too sharply it can become dislodged. The paper flag is not easily accessible and could be a nightmare to get back into position. One possibility is to turn the printer off and try to pull and poke the flag back into place. Usually only a portion of the flag breaks off but if the flag cannot intersect the sensor it does not transmit to the dc controller when paper has entered and left the fuser. FLAG PAPER SENSOR is very useful.