Does anyone know where to find parts for these synths? Or how to get a hold of Yamaha to ask the question? I'm in need of the pn1 board that is the ensemble / tremelo control board. Any help is greatly appreciated.
Most repair centers keep parts for 7 years after a keyboard goes out of production. It is now 40 years ago that the SK30 hit the market. If you want to call Yamaha, the closest distributor is listed on the last page of almost any Yamaha Manual.
I remember the SK30 - part organ, part lead synth, part poly synth, part string machine...
Your best bet is to find a synthesizer museum - usually you'll find a technician who loves old synths and they may be able to put you on to what you can do - or tell you fuhgettaboudit (a NYC expression for "good luck").
Where in the world are you?