Power issue!!! Need help!

I had an electrician come through and wire up the garage in the house so I can get my pinballs up and going. Told him I wanted a separate line and gave him the power needs for White Water. Unfortunately, he changed the plug to this and added this because he thought this would make sure I didn't have any power issues.

Next day, went into the garage, turned it on, heard a loud pop, and then it shut off. I saw that he switched the plugs. I switched it back to the normal plug but now I can't turn it on. I've never dealt with a power issue, was going to start poring through the threads, but hoping someone might know what to test or what to look for. I checked all the fuses and they seemed fine. I saw this burnt spot on the J121 connector. Not sure if that was always there?

Anyone able to help save my White Water?

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Thank you, LTG. I’ll see what I can do this weekend. I appreciate you sending this link.

The electrician who put the outlets in my garage replaced the plug with a 220 volt plug, then plugged it into the wall. I didn’t know he did it until after I turned it on and heard a pop. So it blew something. I’m just trying to find what it blew because I haven’t had to deal with power issues before. Still rather noob and had my pins stored for the past few years and just getting back into them.