Yamaha CS80

Educated guess: replace IC4 & IC5 on the KAS board. It sounds like a
note encoder line (_N3, to be exact) is not operating correctly.

Crow
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On Sun, 3 Apr 2005, STEPHEN TELLER wrote:

> As I scope the A,B,C lines, I notice pin 9 on all 4051's is inactive,
> regardless of playing multiple keys, or activating after touch. Pins 10
> & 11, become active under certain states. I have gone back through the
> immediately obvious circuitry and even re -replaced the chips involved,
> to no avail.
> My question is, if you probe a working CS80 at pin 9 of any of the
> 4051's, is the line active? If not, do you have a viable approach to
> this issue ?