In other news. . .

I discovered that, when ungrounded, there is ~50VAC coursing through my Hyperball frame, including the mounting areas for the boards. Hopefully this would explains why my driver board is fried although the power supply shows to be spitting out the correct voltages.

It drops to 100mv when grounded which I would think is still too much considering it should be zero.

I'll be hunting down the leak this weekend and as a starting point, should I look at the AC filter having gone bad? For some reason that's ringing a bell. Also will be looking at the ground straps that attach to the transformer frames and the lamp and solenoid rectifiers in the backbox.

Any other suspects to check out?

Tested it this way:
If I used used two prong adapter to plug in to the outlet = stray 50v.
Using the game's plug = stray 100mv. The ground prong on the plug tests good for continuity with the game's frame, etc.

So, thinking it's grounded properly and the outlet is grounded properly as well BUT wondering it the 100mv is normal bleed or should it be 0v if truly properly grounded.

Either way, voltage is going somewhere in the game it certainly shouldn't be.

By "circuit box" you mean within the game itself - the wiring of the AC filter, perhaps?

The green wire is testing good for continuity with the ground prong and the plug seems to be original.

For the last two replies:

Yes, the prong on the game's ground plug tests good for continuity for metal on the game.

Also, I'll have to confirm my outlet is wired correctly as well as try a different outlet. I'll also get a pic of the game's AC filter as it's a bit different than the one pictured above, IIRC.

Thx

Here's my AC filter setup:

2014-06-0520.52.17.jpg

Also, the outlets in question check as good with a tester. So, it's the game itself.

I can't imagine 50VAC floating around is good for the game, but how about that 100 to 300mv when grounded - is that a concern?

Lastly, I've also read that the AC filter isn't a concern and can be removed altogether - is this correct?

Well, was more talking about the game boards, etc. I don't think 100 to 300mv would be harmful for the player. It's the boards, man - the BOARDS!

Can't tell black or white as they're all brown from the extension cord, save for the green ground wire.

The wire that's fused before going in to the AC filter is 120v when connected with ground.
The wire that's not fused before going in to the AC filter is pretty much zero (.05mv) when connected with ground.
Fused to nonfused wire (no ground) is 120Vac.
So, presuming the fused wire is the black and normally hot wire, this is properly wired, correct?

It looks to be the original cord with a properly grounded 3rd prong.

EDIT: Issue seems to be the case of the AC filter - removed the grounding straps from it and get ~50VAC when going case to ground (cement) or the case's green wire to ground (cement).

So, safe to remove the AC filter as I've read elsewhere?

Cool, never knew, or even noticed, that!

Yes, wired correctly then as that gets ~0vAC when paired with the ground.

Well, it *looks* original as did the soldering. I recall the Captain Fantastic I had also had the same type cord, so presumed it was original as well.

AC filter removed, regrounded properly and issues gone. May replace it later but want to get things up and running first.

Thx, all.