My 1986 Space Station has worked and played great for a few years now since I had replaced several connectors and other minor board work. Now just as I am about to loan it to a friend for an extended period the music starts cutting out. the music will play for a while and then just stop and start up again later. The call outs don't seem affected.

I am prone to believe that it is a bad connector or bad solder joint. I have looked for anything obvious on the audio board to no avail. I have been able to track other problems down on my other boards but I am new to the Audio board. I am not sure of the roles that the sound roms U21 and U22 (on the CPU) have or the music rom U4 on the audio board?

When I turn the game on I get a single tone which should indicate no problems with the roms. When I press SW1 on the CPU one callout repeats (condition green) no rings. This suggests normal functioning

Can anybody offer any tips on where to look or what to try?