About 5 years ago, when the motherboard went on the fritz on my beloved Pfaff1475, my DH found a guy online who was selling a DVD of the electronic schematics of the Pfaff 1475 for a reasonable price. I think there were other Pfaff models on the DVD, too. We took a chance and ordered it. My electrical engineer DH was able to repair the board--but it took three tries to get all the buttons, stitches, and gizmos to work correctly. What I'm saying is, check online to see if someone has electrical/electronic schematics for your machine.