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Vintage Synth Repair

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Jupiter 6 out of tune

2011-10-17 by Nicolas

Hi everybody,

I'm trying to fix a Jupiter 6 that is out of tune.
The master tune potentiometer has to be completely to the left to tune the keyboard properly.
All the voices and the octaves are well tuned together.

I checked all the supply voltages according to the service manual and they seems to be fine.

Anybody has a hint to fix this problem?
Thank you!

Nicolas

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