having several of the same voice card is one nice thing about working
on the CS series.. too bad they arent removable or pulling and
swapping would help speed up the repair process. Jupiter 4 is a
similar animal in this regard.
are there any notes online on how to perform a simple unison mod to a
CS50/60/80? I would like to put the CS50 i have in unison mode for
this repair.. worst case scenereo if I cant get all the M boards
working I can detune the 2 or 3 that I can repair and make one hell of
a CS monosynth.
thanks
-r
> Sounds like a tricky one this. There is no point in replaceing the
> 151's is it is going to just burn them out, so I would sugest that
> you reduce the area of the problem. Check the power rail caps and
> look for any high voltage comming into the voice card in the EG area
> as well as the filter. Use a working voice as referance.
>
> Let me know how you get on :)
>
>
>
> --- In yamahacs80@yahoogroups.com, Stephen Teller <s.teller@>
> wrote:
> >
> > This list seems to be the only place to get the goods.............
> >
> >
> > When no signal from a voice card is first traced to a VCA, where
> the
> > signal doesn't show, what methods do you use to troubleshoot
> where
> > and how it's being pulled down and overheating several chips in
> the
> > surrounding path. Obviously its a current draw issue, but I don't
> > want to damage more components in the process of replace and
> retest.
> > (When replacing just the first VCA chip that has no output, it
> > overheats the replacement if you leave it in circuit) IC3 and 4
> are
> > specifically troublesome, as they are common output.
> >
> >
> > Thanks!
> >
> > Stephen Teller
> >
> > [Non-text portions of this message have been removed]
> >
>