After continuing to scan at the end of the real paper (because the sensor indicated there was still paper) but not seeing any actual scanning (because there wasn't any paper), the scanner finally decides that there must be a paper jam and gives the error message. With this piece of plastic broken off there was nothing to interrupt the light beam so the scanner thought there was always paper there. This "flag" interrupts an optical sensor light beam behind the pivot when there is no paper. The part of the lever that protrudes and senses the paper was fine, but there is a small "flag" protrusion on the top of this part, above the pivot, that had broken off. This is the 1" long black plastic moving lever that is to the right of the paper feed roller. I had this problem and it was caused by a broken paper feed sensor.
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