Hi Ludo,
Both problems are mostly likely due to age. Bad or very old capacitors can cause all sorts of problems. Replace all of them in your Power Supply. Then the next thing you would wanna do is replace all CMOS 4000 series IC's. It does wonders .
Best regards
Csaba
On 27 May 2012, at 21:20, exxosstudio wrote:
> Hello everybody,
>
> I'm new here. Owning a CS80 is my dream, unfortunately, they are almost impossible to find below $10,000 now, so I think it will remain a dream forever...
>
> So, I recently bought a CS70M instead, and I've got a strange problem with it.
>
> When I play a C or F# and maintain this note while pressing the 4 immediate following notes, those ones stay muted. However, if i do this with starting note other that C or F#, polyphony is properly working.
> Eg : C+D+E+F pressed : D/E/F will stay muted. D+E+F+G pressed : all notes are sounding. C+E+G+A pressed : all notes are sounding. If there is more than 1 tone gap between the C and other notes pressed, polyphony is working well...
>
> Do any of you know what could happen ? Broken IC ? I precise the 6 voices / 12 VCOs seems to be working properly.
>
> Another strange problem is after 10 minutes or so, when the power supply seems to heat a bit, the synth will randomly shutdown and power on again, or if not shutdown, the signal suddently get distorted (like if it was underpowered), it stays like this for 5-10 seconds then return to proper functionning state, then goes fuzzy again...
>
> Any clue ?
>
> Thanks in advance for your help ! :)
>
> Ludo.
>
>
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