Hello friends! New user here. I just joined to Moog fellowship by purchasing an MG-1 at the thrift store. Just about everything is working wonderfully after a deep cleaning and reflowing some horrific previous repairs, however, several keys are not triggering. This is how I received it, by the way. There is somewhat of a pattern to the malfunction. The following keys are not triggering: Low F#,G,G#,A,C,C#,D,D#,F#,G,G#,A. The small repeating pattern is probably a clue, but I can suss it out. Everything above this point is triggering. Voltages are passing through the keys as expected, meaning that if I hold down a functioning key and press one of the offenders the pitch will change appropriately. Using the service manual, I located the trigger extractor (?) chips and replaced them but I did make a substitution, used a TL082 rather than a RC4558. Specs looked ok to make that swap. It did not affect the key situation. I can’t really pin down the problem using the service manual. Could anyone offer any insight? I would greatly appreciate it!
vandelay
