Quoted from Tuukka:I would say the problem was excessive loading of 12V caused by the add-on mods.
I don’t think there is enough information to make this determination yet. Back in post #26 this was mentioned:
But zhu808 hasn’t said exactly what was connected where and probably doesn’t yet have the technical know how to determine the answer.
It’s an interesting problem. I learned some things from this thread. Good to hear different opinions on what might be happening. Without being able to look at and test the machine there is some amount of guesswork involved.
To help zhu808 determine why Theatre of Magic was having problems until the Kahr board was removed can we come up with a methodical process that could be followed by someone new to electronics troubleshooting? Maybe start with a list of every mod connected, what voltage the mod used, and where it was connected? Then measure , maybe monitor them over time? That’s a big ask for a new tech.