from my tech
Hi
I'm working on a CS80 for the first time in years. I am looking at the
after touch areas of this one, and after replacing and socketing all
chips on the TKC & TSB bds and I still have 4 notes (C', f' , f#, and
G') through all octaves not responding to after touch.
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 ?
thanks
Stephen Teller
Stephen Teller Music
805/480-9614
s.teller@...www.stephentellermusic.com