Juno 106 oscillator question.

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Juno 106 oscillator question.

Post by upyoursmate » Fri Oct 25, 2013 6:58 pm

I can't figure out which oscillator which is causing a long wave of slightly change in frequency, when playing. Could it be something caused by the DCO?

Regards, Morten.

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Re: Juno 106 oscillator question.

Post by AK79 » Mon Oct 28, 2013 3:39 pm

put the Juno into Test Mode :

press & hold Key transpose and power on the synth

then press Poly 2. the number of the voice played will now be displayed when you hit a key. This helps figuring out which voice has a problem.

The DCO consists of one Master Oscillator (same for all voices) and two timers (each doing 3 voices). If one voice is out of tune, the problem may be there or in the D/A circuit which provides the CV coming from the keyboard or MIDI.

hope that helps a little.


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Re: Juno 106 oscillator question.

Post by cornutt » Tue Oct 29, 2013 7:23 pm

In my experience, the DCO timing ICs rarely fail, so if it's only one voice that's out of tune, I'd look elsewhere first. Does the out-of-tune voice sound like it has a different timbre than the rest? It could be a VCF that is out of calibration and has way too much resonance.
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