I am keeping my finger crossed that George is still around and can point me to the right direction. With the help of this forum, I was able to get my machine working since 2007. Unfortunaltely last week the MTI-1 board decided to blow up on me and now the spindle is not working again. I searched for a replacement and found a new MTI-1 board on eBay which I have replaced today. When I power the machine, I am not getting the red light on the MTI-1 and the control shows the spindle drive fault error. I have the schematics that George sent long time ago and it seems that I am not getting the 400 voltage in pins 31/32 and 20. Does anyone know what I can look for to troubleshoot this? The 24v DC seems to be coming in fine to the MTI-1 board.

Here is a link to the schematics.

Thank you in advance,

Pali