Panasonic KX-P2023 Dot Matrix Problem

I’ve been running these printers for a decade and I’ve never run into this problem: The head jammed on on the edge of a 3-part form. Nothing new there. I cleared it, and paper manually rolls smoothly. But, on power up, the head travels left, hits the end of travel, bangs 3-4 times, returns to mid position, pauses, travels right, hits end of travel, and bumps/bangs continuously. Behavior is indepensent of PC’s or servers. Any ideas? TIA.

Frank