[sdiy] Korg Polysix major problems

[Bob Weigel]

I've had a cpu go bad on that board.  That'd be first guess. You can of 
course get an 8749 and burn the .bin file onto it that is pointed to 
from my site but the guy who could do it didn't call back when I finally 
got some of the chips.  I need to make an adapter for my needham's 
machine.  Does anyone know off the top how to do that?  I was about to 
get into it a while back and got too busy.  I want to get a cache of 
cpu's for those things here eventually since occasionally one does go 
bad.  -Bob


Karl Ekdahl wrote:

>Hi list
>
>This time i've got my hands on a polysix that's quite dead, i've just verified that the oscillators seem to actually work and the problem is in the key assigner. I've noticed that the flip-flops that are supposed to put the gate out values is not doing anything when keys are depressed, i've also noticed that the clock signal to these (IC4 & IC5) is virtually non-existing. I say "virtually" because there IS a ramp waveform on the clock inputs but it's really low, around a couple of ten millivolts. So i'm wondering, since this clock signal is generated by the 8049 MCU, is it a lost cause? I did try another voice-board (which i also don't think works) and got the exact same behavior...
>
>Please, anyone with polysix experience, help!
>
>Karl
>
>
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