OldSynths

Or a broken pad (if soldering)...  or intermittent solder short...  Or a 
broken wire, or if socketted chips, a bent lead (it happens, believe me) 
which was making contact but isn't now...  Come to think of it, if there 
was a weak solder joint even with sockets, just removing the chips and 
pushing in new ones could break the joint...  

Get a magnifying glass and inspect all of the joints...

Ed

Bob Weigel 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
>
> ----- Original Message -----
> From: "David Shoemaker" <dgsaa@...>
> To: <oldsynths@yahoogroups.com>
> Sent: Thursday, October 30, 2003 12:24 PM
> Subject: [oldsynths] ARP Pro Soloist problems, part 2
>
>
> > Hi everyone,
> >
> > Thanks for the help so far.
> >
> > 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
> >
> >
> >
> > To unsubscribe from this group, send an email to:
> > oldsynths-unsubscribe@yahoogroups.com
> >
> >
> >
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> >
> >
> >
>
>
>
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