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Suggestions Needed - dead MP4

2016-06-23 by jw_dewdney@yahoo.com

Hi - I joined a while back and posted initially about my dead mono/poly with some suggestions to get tke keys cleaned up first. Well I got distracted by other projects (polysix is near finished) since then but now I'm ready to get back to it. I cleaned up half the key contacts (enough at least to know it's NOT the key contacts) and checked the P.S. voltages - seem okay... but what's happening now - (verified the keys are working - mostly- due to triggering VCO LED's on front panel) is that I just have zero output. I'm guessing it's a bad chip somewhere. When you turn the volume all the way up I can hear a rising and falling soft white noise with key presses. So I'm guessing I'm hearing the VCA circuitry doing it's thing (?) - where would you look next? The VCO circuitry? Suggestions? Or can anyone direct me to a post that might be relevant? unfortunately the archive here doesn't seem searchable (or user friendly really).

Thanks. I hope this is clear enough.


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