OldSynths

Hmm.  Well if you have my 'luck'..then yes another chip working for many
years with no problem decided to play out at that very moment :-)  What kind
of chip is it?  I didn't understand what you meant by 'traced voltages to'
or whatever.  If it's a octave divider, do you mean a top octave
synthesizer?  Or just a divide by two for 'sub' type function?  Arp pro
soloist...would think you mean the latter. -Bob

----- Original Message -----
From: "dshoemaker93" <dgsaa@...>
To: <oldsynths@yahoogroups.com>
Sent: Friday, October 31, 2003 11:57 AM
Subject: [oldsynths] Re: ARP Pro Soloist problems, part 2


>
> Hi Bob,
>
> Rail voltages are normal.   Old 301's were soldered in--the ones I've
replaced (not
> with 301's but with LF351s) were put into sockets (good machined ones).
>
> Thanks,
>
> David
>
> --- In oldsynths@yahoogroups.com, "Bob Weigel" <sounddoctorin@m...> wrote:
>
> > David, were you soldering these 301's in or where they socketed?  First
> > question that comes to mind...did you get it inbackwards or wrong
somehow of
> > course...  Not likely the divider would go bad.  Are rail voltages
normal at
> > this point? -Bob
>
> > > I replaced several 301's in the ARP, and everything started working
> > > perfectly except for one preset (Fuzz Guitar I) and the vibrato
> > > circuit.   I identified that an additional 301 (the pulse/saw mixer)
> > > was the probable culprit, replaced that, and then the whole thing went
> > > dead!  Dead in a new way, though,  because now it doesn't even make
the
> > > one low tone.
> > >
> > > I've traced the voltage to the following probable cause:  the octave
> > > divider chip(s).
> > >
> > > Does anyone think that this chip could have suddenly gone bad and
> > > caused a complete dead unit?  Or would there be different symptoms?
> > >
> > > My other thought is that my fiddling around with the boards broke
loose
> > > a wire or something.
> > > This was really heartbreaking, because for about five minutes, I had a
> > > fully working unit!
> > >
> > > Please continue to help if you can--I'll be here all day!  ;-)
> > >
> > > David
> > >
> > >
>
>
>
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