Casio CZ/ VZ/ FZ - Pro Series

Finally found it! Three broken solder pads, corresponding to the legs of 
one of the 2SB632K power amps. Soldering the legs again has fixed the 
audio volume problems :)

Now, I have one more question for you guys. Pitch bend on my CZ-1 works 
about 5.5 semitones down and only 0.5 semitones up. Does anyone have a 
rational explanation for this? I get random small changes in the pitch 
that last between 0.1 to 4 or 5 seconds, and I'm not sure if this could 
be related. Maybe the potentiometer is defective?

Thanks a lot in advance! :)

Manu