Vintage Synth Repair

Have you checked all the basic things... i.e correct voltages, heated 
parts, etc ?

I once fixed a 106 which had a bad VCF/VCA chip. The bad chip heated 
as hell !


--- In vintagesynthrepair@yahoogroups.com, "sputnik979" 
<sputnik979@...> wrote:
>
> Hi guys,
> 
> In my Juno106 there's always an audio signal on the audio_out port 
> that is faintly audible, but strong enough to the point that it's 
> intorelable during a recording. In order to get rid of it I need to 
> switch off the generators - DCO sawwave, DCO pulsewave, subosc - 
> depending on what is employed in a given patch. But then, of 
course, 
> I cannot play. The signal changes pitch if I press several keys. I 
> mean - now I hear C1. But I just need to press several different 
keys 
> in another octave, lets say in the last tone, and then the signal 
> changes into e.g E5. Basically the note played by the synth itself 
is 
> the last note/key I struck. 
> 
> Some guy says this: "You have a defective 80017a voice chip that 
> doesn't shut off its VCA when that voice is played. You can get a 
> replacement chip at www.synthparts.com". Is it really so?
> 
> I can tell you that the 106 has been on for the entire day today 
and 
> nothing chages, this signal/voice just keeps on sounding. But does 
it 
> mean that along with time the chip's condition is going to 
> deteriorate and finally it'll start to lose the voice ?
> 
> If so, may I buy a new chip from this guy?
> http://users.skynet.be/bk318113/303/juno.html
> It's cheaper and new.
> 
> Of course I would neeed a service manual for Juno106.
> Waiting for your help.
> 
> cheers
>