Vintage Synth Repair

Does anybody out there have any experience with the Arp Omni?  I have 
one I was working on for a while back to no avail.  Apparently the 
problem is in the actual tone generators - the filters work fine; 
when one presses the keys, you can hear the filter working its magic 
on the little "clicks" produced, and every key appears to function.  
There's just no tone to be filtered!  If anybody has any advice on 
how to repair the tone generating circuitry on the Omni, lemme know...

BaM

Another little Omni bit here:

If anyone has the large slider caps for the sliders above the keyboard of 
an Omni, please let me know.
I've been looking for some time unsuccessfully with no luck.

Thanks for your time.

Jason




At 02:30 PM 12/6/00 +0000, you wrote:

>Does anybody out there have any experience with the Arp Omni?  I have
>one I was working on for a while back to no avail.  Apparently the
>problem is in the actual tone generators - the filters work fine;
>when one presses the keys, you can hear the filter working its magic
>on the little "clicks" produced, and every key appears to function.
>There's just no tone to be filtered!  If anybody has any advice on
>how to repair the tone generating circuitry on the Omni, lemme know...
>
>BaM
>
>
>
>To unsubscribe from this group, send an email to:
>vintagesynthrepair-unsubscribe@egroups.com
>

Okay, kids, I've just about wrapped up work on my Wurlitzer model 112
electric piano, so now I'm getting ready to grit my teeth and return to
work on a device that drove me nearly to madness about half a year ago:
my non-functioning Arp Omni.  So here's the basic synopsis of what I can
remember:

After a bit of simple work (mostly replacing the infamous leaky caps),
it powers up just fine.  All lights work.  No sound is produced, except
for a bit of "key click".  The filters, however, obviously work, as I
can hear these "key clicks" processed through the filters (i.e., I can
hear the frequency response change at the appropriate intervals).  All
keys obviously work as they can all produce this "key click".
Apparently the tone generator itself or something in its path is the
problem, and will not produce synth OR string sounds.  I can't remember
EVERYTHING I replaced in an attempt to produce sound, but I recall
replacing a few IC chips, transistors, capactitors.

So... any suggestions, kids?

BaM

--
Find out more about Rocket Park at the (subliminal banana) home page!
http://www.rocketparkmusic.com/

>
>So... any suggestions, kids?


Not for you, pops!

;-)

-Kevin

Well then, you can imagine how I feel at 38 to be called "kids" then.... ;-)

Re the omni-

Silly as it sounds, are you sure you have all those ribbon connectors 
in the right sockets and oriented correctly. Not an insult.. little 
things like that sometimes get past the best of us :)

K

>
>Besides, I'm not quite ready to be called "pops" at 30... hehehehe
>
>BaM

Kevin Lightner wrote:

> >So... any suggestions, kids?
>
> Not for you, pops!

Hey now!  I made this list, and I can destroy it just as easily!  :)

Besides, I'm not quite ready to be called "pops" at 30... hehehehe

BaM

--
Find out more about Rocket Park at the (subliminal banana) home page!
http://www.rocketparkmusic.com/