Anyone know how to fix the sound for a Tron pcb?

YieArKade

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I've swapped z80's and the sound amp board tests good. No sound. Does anyone know how to fix this sound problem? I'm trying to fix this so I can sell my Tron some day. How much would a complete working Tron, except for the sound, has original no-flaking marquee with extra plexi Encom marquees (one blue, one gray version) and 2 Encom coin door decals sell for? Has a switching power supply and extra non-working pcb set too and pcb schematics. NOS cpo included. Side art intact but needs replacing.
 
I've swapped z80's and the sound amp board tests good. No sound. Does anyone know how to fix this sound problem? I'm trying to fix this so I can sell my Tron some day. How much would a complete working Tron, except for the sound, has original no-flaking marquee with extra plexi Encom marquees (one blue, one gray version) and 2 Encom coin door decals sell for? Has a switching power supply and extra non-working pcb set too and pcb schematics. NOS cpo included. Side art intact but needs replacing.

Do you get any "Sound Interface Error" messages?
 
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