I think I can help you out, Ive got and AVP 300 badged as an Accutig 300p. My machine would not work in pulse mode and I didnt have a pendant. All sorted and working sweet now, I have pendant/foot control wiring sorted. Can you post a picture of your front panel chris?

Hi I just joined up, did you have any luck Chris?

Im looking for remote pendant /foot control schematic for the same machine so far no info anywhere