Circuit Overview:
A digital synthesizer which utilizes special processing chips designed to support Yamaha's FM synthesis architecture. This, the most popular rendition, used 6 'operators' in the model with 32 algorithms (ie. arrangements of the operators in which they could modulate one another or just act as signal sources in the mix.)
Service Tips:
I've found most of these units to be fairly rock solid circuitry wise. Abused units sometimes have solder problems. I've fixed the few I've had in by just going over suspected areas of the circuit boards soldering questionable joints!
Parts:
While Yamaha normally does not keep parts around more than 5 years or so, some older ones can be gotten from NTS Pro Audio. Otherwise try your local Yamaha dealer or Service person.
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