Problem with Cabinet Senet on 3902 I Game

[Dirtguy]

I am having a problem with the cabinet Senet shorting out the game when plugged in. I would not get any lites on the CPU, like the machine was dead. So I unpluged a few things from the motherboard one at a time (Did not do this with machine on) and when I unplugged the cabinet senet, the Cpu board lit up and screen went to the game. Plug it back in and no lites on cpu. So next I plugged it in and turned the machine on with NO IO cards in the slots, machine came ON. Determined the IO slot on the left when plugged in, is whats knocking everything out. With the IO on the right plugged in by itself ,works fine. I then tried a known working IO card from a working machine and same thing, something shuts it down. My Question is, what does the cabinet Senet work, what should I be looking at to find the problem.I even tried another working CPU and same thing. I also am trying this with the printer and BV unplugged. Any help much appreciated! Thanks Dan

[Tilt]

Swap the power supply.

[lookes]

The cabinet I/O card controls the hopper, meters, bell, and candle. I would change the power supply first as Tilt said.

[Dirtguy]

OK will try, witch one? The one with the plug or the one in the back or both.  Here is a video of whats going on:   https://youtube.com/shorts/gyrzYdXlogI?si=bvXadJ97XboBIsOl

[Tilt]

The power supply is on the back wall directly below the motherboard.

[Dirtguy]

Switched BOTH power supplies and no change. Thanks Lookes, you told me what it controls, I unplugged the candle and sucess. That was knocking it out. Never would have found that , would have gone bald before I tried that on my own, Thanks  Dan

[Tilt]

Glad you got it working