[EricMFG]

I had a Yang SMV1000 for a little while I had the same exact problem. Also the tool changer would get stuck in mid change or the tool magazine wouldn’t retract. If I remember there are three parameters you need to look at. One displays the current tool pot. You need to change one of the 455 or 457 to one less or one more than the current pot number. I’m not sure If I still have the notes on how to fix it I can look.

I got tired of trying to re-align tool pots to correspond with the NC so I would set the parameter to one higher call up T1 then reload the tool changer. If you do that I would recommend clearing height offsets that are not used.

You can write a quick program to load or unload the tools something like
M6 T1;
M00;
M6 T2;
M00