[sdiy] Fun with the Oberheim M6

[St Eric's...]

I am having a simular problem with an Elka em22.
One voice sounds buzzing..
swapping the cem3396's didn't work.

Anyone that knows how to run the calibration routine on this machine?

cheers

Eric van Baaren.
_____________________________
http://www.piramiden.demon.nl




-----Oorspronkelijk bericht-----
Van: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]Namens Tim Parkhurst
Verzonden: woensdag 25 augustus 2004 22:34
Aan: 'WeAreAs1 at aol.com'; synth-diy at dropmix.xs4all.nl
Onderwerp: RE: [sdiy] Fun with the Oberheim M6


> -----Original Message-----
> From: WeAreAs1 at aol.com [mailto:WeAreAs1 at aol.com]
> Sent: Wednesday, August 25, 2004 1:15 PM
> To: tparkhurst at siliconbandwidth.com; synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Fun with the Oberheim M6
>
> At 12:28 PM 8/25/04 , Tim Parkhurst wrote:
>
> <<  >I was running the calibration routines after every chip swap and I
did
> >notice that the problem was getting slightly better (still noticeable,
but
> >not as bad). Well, on a lark I decided to run the calibration three or
four
> >times and THAT CURED THE PROBLEM! John M and I both thought that maybe
the
>
> Hmmm.  15-20 year old synth + IC's in sockets + Oxygen (or what's left of
it
> these days) = Oxidation on chip pins and socket pins.
>
> Take those CEM chips out of their sockets and clean the pins with an Xacto
> knife.  If there are any 4051's and TLO84's or TLO82's in sockets
(especially
> ones that are part of the CV demux circuits -- they'd probably be next to
the
> 4051's), take them out and clean them too.  Work the chips in and out of
the
> sockets a few times to help clean the socket pins.  Use a drop or two of
Cramolin
> to help break up the oxide buildup.  Wear an anti-static wrist strap while
> you do this.
>
> Michael Bacich

True, it could very well be that simply pulling the chips in and out cleared
some of the oxidation and is at least partially responsible for curing the
problem. I believe the 3396s are the only things in sockets on the M6 voice
board, but yanking and cleaning those will be my next chore... as soon as I
get a reasonable insert/removal tool and replace my recently broken wrist
strap. Thanks for the tips!

Tim (wished he had invented the word 'Cramolin') Servo

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