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Original Yamaha Service Manual Booklet for the PSS-390 FM Portasound Mini Synth Keyboard.

Great, original Yamaha service manual for the PSS390 digital FM mini keyboard synthesizer. This is the companion model to the PSS380, and this service manual is abbriviated and has the specs, test program, parts list, and the large overall circuit diagram.

Great for repairing and modifing your Portasound!

• This is a manual or document, this is NOT a piece of equipment or instrument. If you have any questions, I'm always happy to answer them. Thank you so much for looking!

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