Vintage Synth Repair

Hi, while I could sell you a CPU board all those probs you mentioned
are most likely due to bad 80017A VCF/VCA voice chips. :(

--- In vintagesynthrepair@yahoogroups.com, "jamesguitar2000"
<jamie@...> wrote:
>
> hey doug:
> looks like i'm interested in that CPU board after all. my board is
exhibiting signs of 
> complete cpu breakdown... losing certain voices (only temporarily),
certain keys are 
> quieter than others, extremely resonant sounds (even with the res
turned off), weird pitch 
> anomalies, 
> let me know what i need to do to get that board from you as quickly
as possible. i have to 
> install it before my next tour... i am reachable at jamieshields
(at) rogers (dot) com
> thank you,
> -J
> 
> --- In vintagesynthrepair@yahoogroups.com, "synthparts"
<synthparts@> wrote:
> >
> > Hi, if you decide you want to replace the whole CPU board with a
> > working one, I have one.
> > 
> > Doug
> > www.synthparts.com
> > 
> > --- In vintagesynthrepair@yahoogroups.com, "jamesguitar2000"
> > <jamie@> wrote:
> > >
> > > thank you mike and duncan...
> > > i indeed had the problem of "crap on my CPU" (to use a technical
> > term) thanks to an 
> > > overzealous confetti operator at a new year's show at hammerstein
> > ballroom a couple 
> > > years back. i thought i had cleaned it all out. maybe i hadn't... i
> > will recheck the options 
> > > you guys have given me.
> > > -J
> > > 
> > > --- In vintagesynthrepair@yahoogroups.com, "duncan"
<ferrograph@> wrote:
> > > >
> > > > jamie,
> > > > mike's advice is good- this is the same problem that caused the
> > > > infamous "insane" behaviour in early/unmodified moog source
units; in
> > > > that case, the series regs were not soldered at all, but sat
loosely
> > > > in a connector. removing this & soldering them in place would
cure the
> > > > moog but meant exercising extra care when removing the case
for other
> > > > surgery.
> > > > it's possible you may have CPU problems though- I have had a
106 in
> > > > bits that lost it's mind after "liquid ingress"; the board
around the
> > > > CPU is quite sensitive & it may just need a clean to remove
something
> > > > that's deposited there & is "C-shunting" across some CPU
connections;
> > > > anything that can be carried in the air can settle on a pcb &
cause
> > > > this, especially if there's dry-ice or smoke involved... :-)
> > > > 
> > > > duncan.
> > > >
> > >
> >
>