[sdiy] Korg Polysix - now weirdness

[Ullrich Peter]

Hallo Karl!

>So i installed new processors in the polysix (thanks peter!), but to no avail. In my desperation however i
>disconnected the keyboard connector and tried shorting the different pins together - Sound!!
>Of course i got multiple notes playing but at least the things was doing *something*. I wondered if the
>diodes were blown or put in the wrong way, but the only way i can get it to work is by bypassing the diodes
>or putting them in the wrong way - which of course yields multiple notes, again. So what the hell is going on??
>I'm now considering whether ALL the pull-up resistors to the keyboard could be blown??

Maybe. This was the cause in my Crumar Bit masterkeyboard. It worked nice for some years and then stopped working correctly.
Installing new pullup resistors (in parallel to the installed ones) gave me back the proper function.
And it also worked for another guy on the crumar list that had the same error...

So at least it is worth a try... I installed 1k resistors if I remember correctly - so quite low resistor values...

Ciao
Peter

http://www.ullrich.at.tt