[sdiy] Siel DK 600 voice problem (ssm2056 ?)

[Bob Weigel]

Yeah they're great when they work!  If you cleaned w/baking soda 
solution then it shouldn't have too many traces getting eaten in the 
future I guess :-).   Now since...all the analog data is going from the 
CPU board with the S+H's to the analog board and is affecting all of the 
*other* 5 voices from what I'm understanding..we can discount the 
possibility that the problem would be anywhere but on the analog board.  
Did you try swapping the vca to a different channel?  The SSM2024?  If 
no effect there then I've seen resistors go open and a variety of things 
but I'd have to get out the diagram to start making guesses.

cs e wrote:

>Hello
>
>So my wife picked up a Siel DK 600 for me at a local thrift store
>($10)...nice girl.  Anyways, it was dead; 4 hours later I brought it
>back to life!  I'm really liking how it sounds...and I haven't played
>an analog poly for quite a while.
>
>But, Voice 2 is not behaving so nicely.  The basic problem is - the
>ADSR settings don't effect Voice 2 VCA.  For example, attack does
>nothing (fast attack all the time), no decay, and release does nothing
>(no release - unless release set to FULL - then it's kind of a
>distorted drone).  If SUSTAIN = 0, the voice doesn't sound.
>
>Anyone have advice for troubleshooting this?  The envelope is an
>SSM2056.  Does it seem like the envelope IC is dead or maybe some
>associated component is bad?
>
>Thanks
>Chris
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