It sounds like a vibration issue to me. When you stick your finger on the lock pins, you're kind of holding the whole ace in the hole unit still. It stabilizes the thing and prevents it from shaking as much. Have you inspected the opto wiring for that area to make sure it's sturdy?

Alright, but you're still holding the unit steady. It's switch 59, which is an opto, that triggers ace in the hole. If the opto switch is triggering, it means the beam is getting interrupted somehow. It could be the transmitter side stops lining up perfectly with the receiver side. It could be a wire isn't making good contact with one side, so it's not powered. Whatever is causing it, the light is not getting from side A to B. You need to pull your playfield up and look at those two opto boards, and make sure they're screwed in nice and tight and that the wiring is well soldered to the board.

Edit: I say soldered, but they're weird boards and I don't have a WPT in front of me. They may be plugs. Either way, the wires need to be making good contact.

Pinball Center has one, but it's $$$$.

I had the same issue. It turned out to be a broken solder joint. Check the board for this, as you may not need a new one.

My Ace in the whole locks the ball as it should BUT, it realeases it after 5 seconds again, so you get two balls in play...? You can the drain it, but it should be working right and hold the ball until the multiball is activated... Do anyone have a sugestion what could be wrong?

Hello, I guess im having the same issue you reported in the past, every time i press my flipper buttons or the ball hits the bumpers, the jail bash switch (57) is triggered.. what was the issue on you side?

Thanks

If you look in your manual, you'll see switch 57 is an optical switch. First thing to try is reseating the opto connectors at the opto board behind the back board. Power off, playfield slid out up on rails, then follow the wires coming from the two optos closest to the jail bars to the small opto board they connect to. Reseat all connectors on opto board.

Then power up, go into switch edges test and pound on the playfield with your fist to test.

Thanks man, i will check that, dont know if it helps, but when i try it with door open, no coils (lower power) they work as suposed, my initial ideia was some kind of vibration issue.
I will reset connectors and let you know.

Well ive try your advice, no diferent result, but ive found something interesting, if i put some my hand on the assembly and press flipper button, i dont have this issue, is not a question of pressing it, because i dont make any kind of pressure or force, just simply touching it with my hands, maybe a groud problem? this is strange, never see this beaviour before.

Just like the initial post.

Thanks