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Quoted from Tuukka:From the factory, these games worked pretty well without any additional gimmick boards.
Resets from low 5v is a common issue on WPC games. It’s a design weakness. A Kahr board rectifies that design weakness.
https://www.kahr.us/daughterboard.html
Quoted from zhu808:Assuming the 12V circuit reads low, is there any way to bring it back up within parameters without getting rid of the mods
Use a separate power supply to run the mods.
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:
Quoted from phishrace:Many upgrades including ColorDMD, magic wands, spinning hat, working tiger saw, trunk locks and more.'
https://pinside.com/pinball/market/classifieds/archive/113284
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.
Quoted from Pin_Guy:prefer the ColorDMD LED version in these older machines and they not only look better IMO but also draw about 1/10 the power of the ColorDMD LCD version.
Not a factor in reset issues though, right? Since it’s not using the already taxed 5v.
Quoted from MegadethHangar18:Where can I get this 2nd add on 12volt board? is there an item number or correct description name so I can look it up?
All of DumbAss 's boards are listed here: https://pinside.com/pinball/forum/topic/dumbass-test-and-reproduction-pcbs
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