Update :- Replaced op-amps, SCR's, 12v Regulator and Transistors. I now have 12V at onside of the pot (speed input 3 connectors) but the dc output is 240VDC constant. I decided to buy a new board off of an ebayer in Canada for 35ukp including shipping which I think is good value as to buy here in th...

Hello Steve,

Thanks for your reply.

I can't upload an image right now as I am currently at work and the board is at home.

But I can take a photo and post it later this evening.

Cheers
Steve

Dear Group, I have owned a 1988 (aprox) Denford Starmill for a couple of years. I have been using RTLinux EMC as a control method by wiring the L297 / L298 stepper drives to a PC parallel port via Optical Isolators. While doing some debugging of the spindle controller board I mistakenly shorted out ...