[sdiy] Korg Polysix major problems

[Karl Ekdahl]

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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