Eml synthesizers

I have an EML 301 that appears to not be fully functioning properly.  When I plug the 
multipin plug into the EML 200 the joystick and outs from the center section all work and 
produce changes in sound.  However, the keypad on the right and the 16 knobs next to it 
don't do anything, and don't appear to be sending anything out via CV. 

Does anyone have an idea what might be wrong here?  Thanks