Vintage Synth Repair

Arnaldo, 

I don't know the answer to your question, but you
might want to e-mail Roland. I'm sure they have a
website for Brazil. 
Cheers, 

Philip
--- Arnaldo Cavioli Ortega <arnaldo.ortega@...>
wrote:
> Hi!
> 
> It's well known that Roland custom made chips for
> Juno 106 (VCA/VCF 
> 80017 and dual oscillator MC5543) fail frequently.
> My Juno has only 
> two of six 80017 original and one MC5543 has gone
> either. I've been 
> wondering what is the cause of such common failure.
> 
> Some lots are know to be bad. In this case there are
> nothing to do 
> but change the damaged IC but... would it be an
> excessive heating 
> damaging good ones??? I noticed that these ICs,
> specially 80017A 
> works so hot, even for 80's industry standards.
> Considering one can 
> get high temperatures frequently at stage would it
> be the cause of 
> ICs going dead?
> 
> If heating is the problem I believe there is space
> into the cabinet 
> to mount three small fans, one over each set of
> oscillator/VCA/VCF. 
> Would it save my Juno voices?
> 
> Regards and Happy 2001!
> Arnaldo.
> 
> 


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