Did you mount the diode correctly? Maybe the issue is in the switch matrix and the geneva switch is being triggered by "another switch".
(Topic ID: 239278)
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Twilight Zone
Bally, 1993
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Recap: in the test everything is working correctly, during gameplay it does not.
If so: the problem is in the switch matrix. Some other switch that is activated is causing the geneva switch to act up.
I'm not sure I understand correctly. My assumption based on this thread: in the test the gumball works fine? I see the geneva switch is getting hit in the test making me think that both the motor and the switch are correct.
So I'm assuming your gumball machine is working as it should.
My best guess is that your trough opto's need a good cleaning or replacement.
Quoted from the-ace:In the test the gumball doesn't dispense after loading 3 balls. I have the geneva switch error.
Same problem during game play, the gumball loads a ball but doesn't dispense.
The trough has mechanical switches, I will check today if they work as they should...
Aah okay, my assumptions were incorrect. I will check with my TZ as soon as possible.
And you're correct. Trough doesn't have opto's. 
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