Discussion about the Korg PolySix synthesizer

Hi, I've just repaired a KLM-367 board with battery leakage. Everything works fine except that the effects selector does nothing. It is definitively a problem of this KLM-367 board, as I put another working one board and the effects selector was doing fine. So I suppose it's a problem of the mux/demux circuit. Does anybody knows which IC in that board has to do with the effects mode knob?.

Thank you!

Regards.

Manuel

I've found a broken trace near to IC33 I didn't notice before as it was almost imperceptible. Now the effects are working!. Thank you for your help!


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El vie, 7/8/15, Terje Winther terje.winther@wintherstormer.no [PolySix] <PolySix@yahoogroups.com> escribió:

 Asunto: Re: [PolySix] Effects not working due to problem in battery board
 Para: "moogchild@yahoo.es [PolySix]" <PolySix@yahoogroups.com>
 Fecha: viernes, 7 de agosto, 2015 09:10
 
 
  
 
 
 
   
 
 
     
       
       
       IC34 and IC35. It could be that the 4042 chips are
 broken (very common), or that connections to or from the ICs
 are broken.
 
 Den 6. aug.. 2015 kl. 21.43 skrev moogchild@yahoo.es
 [PolySix]:
      
        
 Hi,
 I've just repaired a KLM-367
 board with battery leakage. Everything works fine except
 that the effects selector does nothing. It is definitively a
 problem of this KLM-367 board, as I put
 another working one board and the effects selector was doing
 fine. So I suppose it's a problem of the mux/demux
 circuit. Does anybody knows which IC in that board has to do
 with the effects mode knob?.
 Thank
 you!
 Regards.
 Manuel 
 
     
               
  Terje
 Wintherterje.winther@wintherstormer.nohttp://wintherstormer.no/
 
 
 
 
 
 
 
     
      
 
     
     
 
 
 
 #yiv4073913858 #yiv4073913858 --

I'd first check continuity to the connector that goes to the effects board.
Those traces are often affected by the acid damage. I've had at least one
board where the damage was actually under the connector itself.