Korg Poly800/EX800 Users

>I've got a problem with my synth. Listening through an AMP,
>headphones or even recording. Whenever I play any key on my keyboard
>I get a hissing/popping/static type sound.. it's not to loud, but
>enough to where it causes anything I record/do sound bad. Has anyone
>ever encountered this problem or know what to do? I checked all my
>grounds. Everything seems to be good. It does it with just batteries
>or with the power supply. I opened it up and there was some gum type
>substance over between the C3 and CN9A area. I removed it, was I
>supposed to do this? I tried adjusting the course and fine tuning.
>did not do a thing. Adjusted all my grounds. This sounds barbaric,
>but if I just smack the synth it will go away for an instant. but
>come back.. I think the longest it went without this problem was for
>5 minutes. If anyone can help me with this problem I would really
>appreciate it. Or at least guide me in some direction.

hmm.  I don't think it would be the power supply...or grounding...probably 
the gum stuff doesn't matter that much, unless it's keeping something from 
shorting out.  I think usually the kind of noise you describe is caused by a 
cold solder joint or a bad semiconductor (chip, transistor, etc.).  Try to 
find what section the noise is coming from, I would think it's coming after 
the filter...so...check the output amp or something.  Anyway I know the 
feeling of having a noisy synth.  My EPS emits all manner of snaps, 
crackles, and pops from one of its outputs, I *think* the problem is on one 
chip but the chip is obsolete (MC34085 - anyone know where to find one for 
cheap?) so that's going to be a tough one...

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