Vintage Synth Repair

I recently purchased a moog prodigy (without the keyboard). . so, it 
has a CV-in and trigger in.

I've tried controlling it with the Korg Mono/Poly (which also uses 
V/Oct scaling) and it did not seem to trigger the Prodigy. . OR the 
Prodigy just refuses to produce sound..

I can make the Prodigy play sounds by tapping knobs or flicking the 
face of the unit. . I assume something connection is lose or bad.

Any ideas?

Thanks!
-r scott