Vintage Synth Repair

Thanks Massada  for  your input on this.  This has been an ongoing problem...I got this thing probably a year ago it looks great but gets no sound at all.  I did some checking on it, got the schematics and found that it appears to have a bad - 15 voltage regulator.  So I try and order the part, it has to cross to this and than cross to this and etc.  Finally I get a pair of regulators that should work, I put one in and it works momentarily and fails toasting a resistor on the way.  I take it to a local tech...They keep it two months and return it unrepaired, they cant find the -15 voltage regulator and suggest designing a new power supply for it - but don't seem eager to do it.  Mainly they tell me not to come back unless "I bring in something from after 1970".  So now I'm back where I started with the damn thing sitting in the corner of the studio collecting dust.  At this point I'm looking for anything and 

Regards,

Ed

 

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Message: 2
Date: Thu, 11 Sep 2003 10:14:39 -0700
From: "masada wilmot" 
Subject: RE: OMni 2 Powersupply repair cont...

Hello all,



I'm a fairly new lurker on here but I feel the need to pipe in on this
thread. As I recall, the power supplies on the Omni are a simple standard
design with no exotic components. If the transformer is still OK, replacing
the active components would not cost more than $5 and you would not have to
install a mechanically different subsystem.



I've just repaired a Quadra supply that was just a standard
723/op-amp/TIP110-115 circuit. I haven't looked at the Omni for quite some
time but I expect that it is the same. Am I missing something here that went
before?



mw



PS, a supply that is capable of putting out more amps than you need is
normally not a problem. However, beware the supplies that require a minimum
load on one rail to maintain regulation - usually switchers.







-----Original Message-----
From: Ed Hallborg [mailto:ehallborg@...] 
Sent: Thursday, September 11, 2003 7:35 AM
To: vintagesynthrepair@yahoogroups.com
Subject: [vintagesynthrepair] OMni 2 Powersupply repair cont...



Robert,



Here's the only thing I found so far that meets your specs.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem
0> &item=2556349463&category=32720



Is this or something like it usable? I have done some google searches and
found the whole power supply boards but they seem like they are putting out
too many amps. I don't know if thats a problem or not---also the ones I
found on mouser.com are about 100$ apiece. That's fine if it will work.



Regards,

Ed

Message: 1
Date: Sat, 6 Sep 2003 08:36:27 -0700 (PDT)
From: Robert Benchic 
Subject: Re: Subject: Re: another broken omni 2

Ed, 

You would be replacing the entire power supply
eliminating the need to repair the regulator in the
original. The connections would be easy, positive and
negative 15 volts DC with a common ground and 115
volts AC. I can find you a supplier and appropriate
model if you like. 

-Bob


--- Ed Hallborg wrote:
> Thanks Robert,
> 
> Can you tell me anymore about these? I'm a bit
> confused as too whether they will take care of the
> -15 voltage regulator problem in the omni 2. Do
> they bypass the regulator or something. Is their a
> special procedure to hook them up?
> 
> Thanks,
> Ed
>
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