I have a Mr Do's Castle that I have been working on and now need some help with the sound. The game plays fine except for the fact it has no sound. I am assuming that the little board by the coin door is a amp of some kind. I have four wires going to this amp board...a black GND wire coming from "A" on the connector...a red wire with 11.3vdc coming from "J" on the connector...a orange/black wire with 5vdc (audio) from "L" on the connector...and a cream colored one that I get nothing on and is coming from "M" on the connector. My pinout is saying "M" is not used so why is a wire there? I get nothing coming out of my little amp board up to the speaker which I know is good. Is there a schematic for this little board and is there any way to test it?
Thanks for any help,
Scott
Thanks for any help,
Scott
