I have a Bally Sounds Plus (AS-2518-56) board out of a Xenon that I'm having a hell of a time with... I'm seeing the below and am relatively stuck on where to go next...
SYmptoms - no sounds (or vocals)
1 - Took the board out - Cap kit was done prior to my involvement (looked new and correctly connected)
2 - repinned the connectors and replaced the POT
3 - Voltages are 13.6 and 5.17 on 1 an 2 (14.9 on 3, 3 on 5, and 13 on 6 if that matters, but I believe the 5v and 12v are the keys)
4 - Replaced each chip on the board with ones out of my spare MPUs and/or working 51 board (I'm back home testing in my Mystic...)
Still - no sounds. I do hear hum when the playfield lights shift around
Any expert advice on where to go next? I'd recommend just replacing the stupid thing if it didn't need to be that special board to mate with the vocalizer. (and it's for a sweet elderly couple that have had it since the mid 80s, so I'm kinda pro-bono on this one and trying to resolve it in house)