The sound was working on my Blackout, then it stopped working for about a week. Then it started working again. Tonight it was working fine... before I cleverly decided to do an LED upgrade. Now I have very pretty lights... but the sound doesn't work. Sigh.

When I turn it on, the speaker clicks. So, it isn't the speaker. I've tried the test button on the sound board, once or twice out of several presses of the test button I heard a click through the speaker. All the fuses are good. I didn't disturb the pot while I was adding the lights (as far as I know). I didn't open the backbox until the sound stopped working.

I don't know how to do that. Is there a resource somewhere that would explain how I would scope out a 6821PIA?

Thanks - I've had an electronics course and I know how to use a DMM and solder, read schematics and things like that, but I've never used an oscilloscope. I'd be inclined to send a bad board out for repair or buy a new one rather than buy a scope and spend the hours to fix it myself. I'm trying to rule out everything else before I do that, though.

I did try re-seating the connector between the speech board and the sound board and that didn't help.

The pot is good, and I cleared all the switches. The drop target coils aren't working right, but I will try and swap out the sound board with another one I have and see if that fixes it.

When I reseated the speech board connector on the sound board the sound came back, so I'm thinking either a new cable or the connector needs to be resoldered is the real issue. Sockets are not scanbe thank goodness.