Crumar Musical Instruments User Group.

Hello Friends

I've almost finished with a DS2

corrected:
dead power supply (Caps and lm326)
dead Noise (caps)
dead filter board (2 ca3080)
bad polyphony (2 hbf 4727)
bad lfo 2 (dead hbf 4727)
wrong osc 2 (dead 74175) (was 2 octave down)

extra: pots clenaing and caps substitution everywhere

But I still have one problem

The keyabord voltage is not correct :

Is linear (is a negative voltage) till F#2 (octave #2), after restart
on G2 and grows but not linerly till the end.

I measured the voltage on the analog board and is coming from the slot
at the left (and orange mini cable (the sixth from the left))

Do you have any idea where the voltage is created ?

on the schematics is not clear where is the generator, I guess on the
D to A (#5) board...

Any idea?

thank you
at