Vintage Synth Repair

all this ARP Omni chatter has inspired me to scan & post the entire
service manual on my site:

http://peterunderdog.com/arp/omnimanual.pdf

PB>>

p.s., i love the smell of smoking power supplies in the morning...

--
Peter Brown
office: (413) 577-2747
cell: (413) 687-8287
AIM: pb0000math

On Thu, 8 May 2008, Mark Wallis wrote:

>
> Hi Folks,
>
> This would be my first post. I thought I'd jump in now as you're 
> discussing ARP Omnis.
>
> My main thing is classic electro-mechanical gear, Hammonds, Wurlitzers, 
> Rhodes, Clavinets, Mellotrons etc. My electronics knowledge isn't 
> brilliant but I seem to get by and learn quickly.
>
> I do quite a lot of work on old synths too, I usually get there in the 
> end but I'm having a bit of a nightmare with an Omni 2.
>
> Everything now works beautifully but two of the switches don't behave as 
> they should. These are in the left hand board, one controls the deep 
> synth voice, the other the 'staccato' function for the bass. Essentially 
> they switch on (once, after powering up) but won't switch off. The 
> functions themselves are all fine, she sings. I just can't make these 
> switches switch. Sometimes touching the legs of the associated 
> transistor (not shorting them, I hasten to add!) with my scope probe 
> triggers the switching.. All resistors appear fine.
>
> Any ideas? I'm impatient to get this finished and back to it's owner, 
> especially as extensive work has made a dead dog of an Omni-2 into an 
> otherwise lovely instrument.
>
>
> Best wishes,
>
> msw
>
>
> ________________________________
>> To: vintagesynthrepair@yahoogroups.com
>> From: rtellason@...
>> Date: Thu, 8 May 2008 17:30:08 -0400
>> Subject: Re: [vintagesynthrepair] arp omni
>>
>>
>> On Thursday 08 May 2008 17:20, Philip wrote:
>>> As I think I've said before the bulk of my electronics
>>> experience is in fixing logic circuits, PSU's and
>>> monitors in archaic arcade video games,like Space
>>> Invaders and so on from the same sorts of periods as
>>> synths..and I have to say where there's a tant there's
>>> trouble, maybe 50% of the time.
>>
>> Do you figure that they're from a specific time period, the ones that are
>> going bad?
>>
>>> --- Malte Rogacki
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