Hello again, pinballmaniac40! You helped me in my other thread so maybe I should move this question to it's own thread. Let me know if I should do that.
Anyhow, in my "It won't boot" thread I believe you pointed out some corrosion issues on my CPU board so that could very well be my issue. Here's what I've done so far in regards to sound:
- I verified the U21, U22 ROMs on the CPU board and the U4 and U19 ROMs on the audio board. U4 and U21 didn't check out so I reburned those. That actually ended up fixing my boot up tone not occurring and some other sound issues.
- Recapped the audio board with all new electrolytics.
- Had to buy new audio cables (ribbon, and the 4-pin that connects the CPU to the Audio board) as mine were missing. I verified that the ribbon cable isn't offset when installed.
- Music test in diagnostics, all music selections work ( prior to recapping and new rom, this was silent ) and sound great.
- Sound test in diagnostics, all sound selections work except for 4 and 5 so that's another problem. Increasing volume to max for 4 and 5 I still don't hear anything in those slots.
- As I mentioned, pressing SW-1 on the CPU after getting the one 'bong' on startup, it just plays the 'angel chorus' sound over and over until I turn off the machine. It's quite pleasant, but I don't know if it's the "correct" action.
My plan was to download the audio test rom from pinwiki and start tracing out the address lines in the audio section in order to figure out the missing 4 and 5 sounds, but I wanted to just quickly check in the forum exactly the sounds I should expect when hitting the SW-1 switch. As far as the missing sounds go, I suspect it's possible my U9 is acting weird or as I've seen in other pinsider threads the CVSD could be an issue or something I'm unaware of. I also haven't replaced the c15 and c18 electrolytic caps on the CPU board yet; that's also on my list.
I've attached the pictures of my board from that previous thread so some things are outdated on it, including the removal of the battery holder and adding NVRAM from pinitech. Let me know if I should take some updated photos.