Hi all,
I am currently working on a mori seiki sl-25 lathe and we had a short to gnd on a fan that was tied to the main cb of the machine that blew one of the fuses and single phased the machine after the short was repaired and disconnect fuse replaced the spindle amp was giving al-12 immediately when a jog or run command was issued, even with the motor leads disconnected it did this. Got on the phone with fanuc and they sent me a top board and 3 igbt modules, with very vague testing instructions for testing my existing ones for shorts between b,c,and e. I have not found any shorts, and there test has me checking with the jumper bars installed and motor leads removed. Anyone have a better procedure for testing these modules even if it means removing all jumpers/wires? Sorry if this isn't in the right section or is already answered I appreciate any assistance I can get!!! I have lots of experience with smaller servo amps but this is my first shot at a spindle amp of this age!

Btw amp model is a06b-6055-h422