KISS
Bally, 1979You're currently viewing posts by Pinsider wayout440.
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Quoted from Gatecrasher:Even if I unplug the speaker wire from the sound board it still hums.
OK, with no speaker connected that tells you right there your hum has absolutely nothing to do with the soundboard or audio system. So what is actually humming? Usually it's the transformer if it is not the audio system. Open the game and put your ear nearby and give a listen.
Quoted from Gatecrasher:tried turning the lights off and saw what was apparently happening. When it would go out there was a spark coming from the transformer windings.
Quoted from Gatecrasher:The only thing that did anything was to disconnect the auxiliary lamp driver. I could at least play the game but the hum is still there. It gets worse the longer it is on until eventually the lamps start to flicker. The hum pulses with the playfield lamps.
TP1 = +6.5 vdc (AS2518-49 version, feature lamps) Yours is way low
Hmmm. Clues? Could something be wrong with the aux lamp driver that is doing something to rectifier board? Seems the only voltage that is way off.
Quoted from Freeplay40:All I can really remember is that the problem he had would seem to have nothing to do with the sound board, but in the end that's exactly what it was.
Quoted from Gatecrasher:I rebuilt the sound board and even swapped it out with another one but they both behave exactly the same.
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Berea, OH