Vintage Synth Repair

Thanks Malte.. will check this out in the morning 
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Sounds like the typical chip problem.

Run the following test: Power up the Juno while you hold the "Transpose"
button down. The press bothe "Poly1" and "Poly2" at the same time so both
lights are up. Press "Bank 2" and then press any note six times. The active
voice is displayed in the readout. You'll see which voice is dead.