I've got a 79 Stern Meteor I'm trying get working.
I've replaced the rectifier with a new board (and repinned its connectors) and also replaced the SB-300 sound board with a new one from ksarcade.net
I've checked all connectors and solder joints on the MPU. They look great.
The machine seems to boot up ok (I get the 7 beeps)
However once I add a credit to the machine and hit the button, the sound starts looping 2 low tones over and over like its stuck.
I've attached a link to a sound file on youtube so you can hear my issue:
Any ideas on what that might be or how to solve it?