"I also downloaded Tayfunk's circuit diagram of the VD, it helped me a lot when doing the initial troubleshooting, Thanks a bunch, Tayfunk!"

Hello Gearloose, I'm wondering if I could get the diagram of the VD from you?
I have been having intermittent issues with alarm 123 spindle drive fault. Nothing serious YET! I would like to avoid a complete shutdown if at all possible. I have read on numerous forums that this is a common occurrence, but no one seems to have a clear reason and surefire fix for this. I would prefer it if I didn't have to replace a bunch of unnecessary items. Most all of my measurements have been within the prescribed ranges for the items that are in the power and control loops. I don't know what else to check that has not been discussed and therefore I would like a diagram of any and all associated circuits. Thanks for any help.