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Is this a gotlieb or aftermarket Qbert PCB? If so who makes them and does anyone have the manual or pinouts?
I've got the basic JAMMA adapter working. The video comes up and the board is randomly displaying colors and game characters. I'm going to replace some caps, but I'd really like a manual for this PCB.
I haven't seen any aftermarket boards that trigger a knocker. JROK?
The knocker circuit triggers the knocker by completing the ground path to the knocker coil. You would still need at least a 24v ps to power the knocker or change the coil out to something that could run off 12v. Im not sure if a standard switcher has enough umph to operate a pin coil.
The knocker will fire on 12volts just not as strong. The difference in noise produced between 28v and 12v isn't much different in my opinion.