welp, after 2 years i was finally able to pull all my machines out of storage..and one by one i am going thru and trying to get them working again.

ok, so my TRON fired right up and plays fine...but i have no sound. also the lights to the coin door no longer light up. its been so long since i been able to work on anything i have forgotten a lot..anyone know where to start looking for no sound issues on tron..

<----IS this the sound card?
what i done so far..checked fuses of courses..the sound board appears to be fine no corrosion or heat marks. i checked all the wiring to the speakers..what else can i check??