Space Invaders Deluxe coin circuit help

DocCherry

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Got a SI Deluxe for $50.

Game comes up but I can't put credits on it. One coin switch appears broken, the other clicks but no credits are given. The counter does not advance.

The power supply tests fine.

I tried jumping the contacts on the coin switch and got nothing.

I tested the two wires going from the coin switches back to the board and they're okay.

Is there a way I can test the board to see if it will take credits? Thank you in advance.

Perhaps I'm missing how this circuit works.
 
I use the coin mech on my machine, I just click away on it to get credits. You said that the wiring tests fine. Do you have a schematic for the game? This guy has a great site with all the manuals: http://www.robotron-2084.co.uk/manualsinvaders.html
If the switch isn't working, the contacts may not be working inside the switch itself. You also said you bypassed the switch and still nothing? try the schematics and maybe the wiring isn't connected properly to the motherboard.
 
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