Vintage Simmons Drums (UK) Users Group

If the single outputs work and some of the channels appear on the mix output, you have (only) a problem with the wiring. I guess, some soldering points are rotten.
The channels signals are fed via a resistor 22k and this ugly big capacitor 0.47µf from emitter of the transistor T6 2N 5172 to the mix volume pot. You don't have to remove the whole PCB board from the housing to check this, you lucky man.
Try to re-solder the channel faders (!) and the big capacitors first.
Good luck


  ----- Original Message ----- 
  From: jesper 
  To: Simmons_Drums@yahoogroups.com 
  Sent: Monday, March 28, 2011 2:48 PM
  Subject: [Simmons Drums] SDS-III separate outs vs. mix out


    
  Hi list,

  I brought out the SDS-III to check out what the hell is the problem I'd 
  experienced with the outs.

  Connecting all four pads to the DIN-5 pad socket all of them triggers 
  the right channels and the separate outs are loud and clear.

  When swithing to mix out channel 3 and 4 still produce sounds but 1 and 
  2 turns silent. I've eliminated all obvious things like grounding and 
  dirty sockets, loose wires etc.

  When fiddling with the effect switches on channel 1 I realise that it 
  _sometimes_ feeds the signal to the mix out. The problem seems to be 
  located in this part of the circuitry or even the switches themselves.

  I'll dive into the schematics soon to see how it's rigged, but if anyone 
  has any heureka moments out of this description, let me know. I focus on 
  channel 1 since I get some results there and will assume that channel 2 
  have some other issue I can deal with later.

  Recent Ebay note:

  A claptrap mk1 was sold on ebay Germany yesterday. 451 euros. Yesterday 
  was a 70's e-drum evening with a Syncussion selling at 600+ and a 
  Pollard twin at 407 (I know that exact figure 'cause I placed the 406, 
  hoping to snatch the pedal and resell the synth). :S

  cheers,
  -- 
  electronically yours, jesper

  - -- --- ---- ----- ---- --- -- -
  www.electronic-obsession.se


  

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