I think you've found your problem... or at least you're really close. I had to refer back to some photos I took of my machine before I gutted the power supply. Also, my board is a little but different but the electronics are very similar. The numbering system is off but they are basically the same machine. Now I have to caution you... you're about to get into the 240VAC so you have to determine for yourself how safe you feel in your ability to work around high voltage. I know it scares me but I'm kind of like Bugs Bunny hitting bombs on the detonator to see if they are duds... so far so good. That being said ... there are two big honker coils in the middle of the machine and a full wave bridge rectifier that are supposed to supply you with the 50-70VDC you are supposed to be seeing across the white and black wires. From my photos, the black wire comes from the full wave bridge rectifier and the white goes into another coil and then into the rectifier. This is essentially the bigger coil acting as a transformer, the full wave rectifier converting it to DC and the smaller coil acting as a smoothing inductor for the output. What I would do is, with the power off, disconnect the spade connectors for the black (and green/yellow wire on my machine) and the white wire, power on the machine and see if I have DC voltage on those terminal on the Full Wave. If yes the inductor coil is open if no then there may be a problem with the transformer coil. SO if no, then I would look at the Drive Pilot light. If it is illuminated, the the transformer coil is likely open. If the pilot light is off then you are at page 1 of the schematic at co-ordinate 3 B and that is the circuit to examine next. It's a bit exciting because I'm thinking you can absolutely fix this. Good luck.
