[sdiy] juno 106 repair

[Steven Downhill]

I can't remember who was originally asking about how to repair the Juno
fault as described below, but whoever you are FYI the Juno 106 Service
manual is available on the link below.
Good luck!.

http://www.hinzen.de/midi/juno-106/manual/index.html

Regards
Steven

> -----Original Message-----
> From:	Byron G. Jacquot [SMTP:thescum at surfree.com]
> Sent:	15 May 2003 04:30
> To:	synth-diy at dropmix.xs4all.nl
> Subject:	Re: [sdiy] juno 106 repair
> 
> >Here's my situation. I have a Juno 106 with the common bad oscillator 
> >problem. To fix that I know I need to buy a new oscillator and replace
> >the defective one.
> >
> >The problem I'm asking your help with, is that the square wave doesn't 
> >work. that is, when the sub osc and triangle are turned off it will make 
> >no sound. Is there any way I can fix this? Is it related to the previous
> >problem? I have an oscilloscope if there's something I can do..
> 
> Just a second, let's make sure we're on the same page here.
> 
> I assume you put the Juno into the diagnoistics mode, and then cycle
> through
> the voices as you play.  Is there a voice that's entirely absent as you
> cycle through?  Or is it just that one voice doesn't make a square wave,
> but
> the sawtooth and suboctave are there?
> 
> If that's the case, the voice chip is still good, and whatever downstream
> devices mix the waveforms together are having problems.  I don't have the
> schematics in front of me, but I seem to recall an analog multiplexer in
> there for selecting the square and saw waves...that's probably easier to
> replace than the voice chip.
> 
> If I've misunderstood your question, please try again, and we'll give it
> another go.
> 
> Byron Jacquot
> 
> 
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