TECH: Sega Afterburner pcb coin / start button controls no..

Archived from groups: rec.games.video.arcade.collecting (More info?)

Hi

I have a Sega Afterburner pcb fitted in the original metal case with
the filter board fitted.

I am currently converting this to jamma. I have got power, sound and
video at present. i am using the widely available wiring diagram from
the manual.

The game runs ok, all graphics and sound present.

When i try to contact the wires on the filter board for the coins and
start switches according to the wiring diagram nothing happens. I have
noticed that these are connected to some pc817 optocouplers.

IC156 PC817 (led input side) when tested with a diode tester give
readings connected both ways round (anode and cathode). the other
PC817's don't. is this the cause of my problem? Has the led's inside
the optocoupler burnt out?

Thanks for your time.

Steve