Blackout
Williams, 1980You're currently viewing posts by Pinsider Schwaggs.
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I always replace both sides of the 40 pin. The plating on the pins go bad just as easily as the other side.
What have you done to the power supply board to restore it? Could be a cold solder joint or a weak 5v regulator that when the draw of the sound board pulls the transformer voltage just low enough to cause issues.
Does the sound board work on the bench. Does it have proper fuses?
Before you replace the 5V regulator, loosen the mounting nuts, wiggle the regulator and securely tighten it back down and see if that changes anything. The mounting screws and nuts are part of the circuit.
Quoted from ChadTower:Interesting result here. I put the original sound board back in. Put the temp 8ohm speaker in to test the sound. Not only is the sound board 100% now but the game seems to be stable. I didn't cycle any connectors except those on the sound board putting the original back in. The only system change is the temp speaker.
Is it possible the original speaker has been just about to die all along and was causing the sound amp to pull too much current to drive it? What sort of reading would I take on that speaker to support that theory? I can't seem to get any sort of useful impedance reading from it. 4ohm speakers in other games are all giving me around 3.7ohms taking the same measurement.
Anything is possible. I would think that if it was drawing enough power to pull the transformer winding down, it would have blown the fuses on the sound board.
Did you try re-seating the socketed chips (CPU, ROMs, etc)? Have you ever replaced the single wipe sockets?
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Shepherdsville, KY