IPAC Four repeating input

[Charlzyefc]

I’ve bought a 4 player arcade cabinet with 4 coin mechanisms the machine is second hand and it’s a bit of a project, the cabinet has come with an IPAC Four all wired up and I’m having no issues with any of the buttons, joysticks etc but I’m having an issue with one of the four coin mechanisms, when I power the cabinet and the IPAC I get a constant repeating key stroke, the number 5, that doesn’t stop until I interrupt it by pressing another button, at first I thought the coin mech was faulty so I’ve replaced it, then I thought the wiring was faulty so I’ve replaced it and fully tested it, I believe it’s an issue with the ‘1COIN’ input where the player 1 mechanism is wired, even when I fully disconnect the wiring and power to ‘1COIN’ it still repeats, I have reflashed the board and had no luck I’ve tried mapping to a different key, the only thing I haven’t done is change to a different spare input on the board, seems a shame to do that because all the cables are nice and neat the way they are and I’d risk damaging cables snipping cable ties off.

Could you think of any other fix for this or shed some light on why it may be happening?

Could it just be a faulty input/switch?

Any help appreciated.

Thank you.
Dan.