Vintage Synth Repair

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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