Change your initials to AAA.

But in the real world. First I would go into switch edge test and see if any switches are closed that should be open.

None ? Then moving on I'd be thinking normal switch matrix issue - switch wired wrong, diode on backwards, or a short to switch wiring or switch lugs - and this can be anywhere on the playfield or game.

I'd also check the start button and nearby coin door interface board - be sure they are clean of dust. Dust from the flipper wear can have metal in it and cause weird issues.

LTG : )

Cool. You found a problem.

For a start disconnect the wires - still closed ? If so from there into your game you have a problem.

If not - then be sure wires are on the right spots on the switch, and that the switch isn't bad.
Wires should be on C ( common ) and NO ( Normally open ).

LTG : )

Could be corrosion on the CPU board, too.

Try a different switch, and wires to the right spots. ( I posted previously )

LTG : )

Have you gone into switch edge test and see if it or any other switches are closed that should be open.

If start button is the only one, then go over the basics of a switch matrix issue. Switch wired wrong, diode on backwards, or a short to switch wiring. And you'll need to check all your switches.

Check the coin door interface board too, to be sure nothing is behind it, or dust on the fornt conducting electricity.

LTG : )

Try re-seating all the connectors on the coin door interface board and the CPU and see if it makes any difference. Sometimes something simple like this can do the trick.

Hi did this issue ever get solved? Pretty old thread but I'm thinking of picking up a JD that has this issue...

the switch has 3 connections. The outer 2 are the ones you want. The one closest to the button should not be connected