After some great help from the forum, I got a Firepower pin working that I had acquired. After fixing, we had been playing it for 3 weeks with no issues, and during a game the speech suddenly stopped. When it happened, both the sound and speech stopped mid-game, but could faintly hear some sound if I turned the volume level all the way up.
- checked the pot, and if I turned it up a bit, the sounds came back, but no speech
As I was reading posts and schematics, it seems that in order to have speech the option switches both have to be turned on. When I looked at mine, one was on, but the other was not. If that is the case, how was I getting speech for the last month? Switching them both to on did not enable speech.
In one of the posts, it sounded like IC3 on the speech board could be the problem, but also says to replace it as a last resort.
The schematics for the sound and speech boards says to check for data and speech clock activity. Am I to assume I cannot do this without an oscilloscope?
Any advice?