44 Pin Frogger PCB Question

Riptor

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I made an adapter to test 44 pin frogger boards but cant get sound out of them. All the pinouts I can find on them are the same and it lists two speaker+ pins which I assume one is actually speaker-. Does this board require an external pot, if so where does it connect? I see a three pin header on the board. There is also a place on the board for a pot but none of the boards have a pot on it. I have four of these boards here.
 
According to the wiring diagram in the manual their are 3 - 44 pin harnesses but the speaker and volume control pot are wired up to the same pins just the wire colors vary.If you are just wiring up to test and not wiring a cabinet try this.
The speaker wires run to pin 18 and pin Z on the 44 pin connector. The speaker is 8 OHM
The volume control has 3 wires, red,shield and black. The red is on one end lug of the pot and goes to pin V on the 44 pin connector.
The shield is on the other end lug of the pot and goes to pin S on the 44 pin connector.
The black wire is on the center lug on the pot and goes to pin P on the 44 pin connector
It does not say what value the pot is.
Hope that works for ya. :)
 

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Thanks Sam. Yes, I did some digging last night and found a moon cresta schematic which shows the same pinout. I will try that today, im sure its right.
 
I made an adapter to test 44 pin frogger boards but cant get sound out of them. All the pinouts I can find on them are the same and it lists two speaker+ pins which I assume one is actually speaker-. Does this board require an external pot, if so where does it connect? I see a three pin header on the board. There is also a place on the board for a pot but none of the boards have a pot on it. I have four of these boards here.

Yes, it needs an external pot... look at the Moon Cresta schematics.
 
No luck on this yet. I hooked everything up according to the moon cresta manual and im getting static that goes up an down in volume with the pot but no game sounds. Same result with three different boards. Moon cresta manual states 100 ohm pot which is what im using.
 
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