Proceed CD Library

Can you get a schematic for this unit? That might offer a useful clue.

I tried that and they were quite kind but could not provide the answer. I keep looking for someone to be selling one so as to ask what I could do. If anyone sees an add please let me know.
Again thanks to everyone trying to help!

I am just afraid if I do not find the answer a piece of audio history will fall by the wayside, let's not give up.
Thank you everyone!!

@tonyaudio
Can you provide some picture of the battery compartment?
What you need is a 4.8V battery pack connect or clip to the battery compartment + and - terminal to make it work or see if the Communicator (the controller) still in working condition.
If you got 4 of those 1/2C rechargeable NiCad battery on hand, add some conductive spacer to make it to correct length.