shardian
New member
A friend of mine has a pacman pinball with an odd sound issue. The general sound works great, but the voices are super quiet with the pot turned all the way up. All 3 pots have been checked with a multimeter, and a cap kit has been done.
The only thing that seems out of the ordinary, is that the 3 identical U chip PIA's, one of them is a different part number. He swapped them around, and the voices went away.
Sorry I don't have technical details at the moment - just going off of memory while I was over at his place troubleshooting last night.
Personally, I think it seems like a sound amp is bad, but I don't know where the suspected sound amp is one the board. Is it U16? Is it one of those PIA chips?
The only thing that seems out of the ordinary, is that the 3 identical U chip PIA's, one of them is a different part number. He swapped them around, and the voices went away.
Sorry I don't have technical details at the moment - just going off of memory while I was over at his place troubleshooting last night.
Personally, I think it seems like a sound amp is bad, but I don't know where the suspected sound amp is one the board. Is it U16? Is it one of those PIA chips?