Vintage Simmons Drums (UK) Users Group

Well, people often say op-amps seldom burn, but my experience says it's 
often them. If it isn't any exotic op-amp I'd say: "start by changing that". 
Op-amp are oftnee responsible when something that should work suddenly 
dies...

Been there, done that. ;)

electronically yours, jesper
- -- --- ---- ----- ---- --- -- -
www.electronic-obsession.se


----- Original Message ----- 
From: "schuitzx" <mschultz@...>
To: <Simmons_Drums@yahoogroups.com>
Sent: Wednesday, May 17, 2006 3:01 PM
Subject: [Spam] [Simmons Drums] SDS-1000 problems


> Hi, sorry if this is double-posted.  I'm having some mail issues:
>
> Folks,
>
> I just purchased an SDS-1000 and pads.  The unit was supposedly
> working fine when shipped, but out of the box I am having trouble with
> the kick and snare trigger inputs.  I was hoping someone here might
> have an idea.
>
> Problem:
> The snare trigger input works only when I wail on the pad.  The kick
> trigger does not respond at all and does not send a midi event.  The
> three tom inputs work flawlessly with all combinations of pads and
> cables, from light taps to heavy hitting.  The above symptoms on K & S
> happen with a known good cable and pad, on all programs.
>
> So far:
> - all the voices work, since I can play them using an external MIDI
> controller.
> - jacks and front panel sensitivity knobs are solid and clean.  Pots
> have been flushed with Cailube MCL and measure correctly with a meter.
> - all socketed ICs have been re-seated
> - peizo trigger signal has been traced all the way to quad op-amp
> inputs for the kick and snare peak detector circuits using an
> oscilloscope.
>
> Something seems to be wrong with the trigger circuits or whatever ADC
> sends the triggers to the 8051.  I don't have a schematic, and so am
> unable to take it any further.
>
> Does anyone have any ideas, and barring that, can anyone provide an
> SDS-1000 schematic?
> Thanks,
> MikeS
>
> ****
> http://www.boycrusher.com
> http://www.hilotrons.com
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