I am sorry but the Medley line of duplicators have been out of production for quite a while and the parts for this machine including compatible replacement drives are just no longer available, they have to be considered at end of life.
This leaves us in a position where we cannot provide you with any repair options.
Please check the link below for our current line of duplicators:
http://www.discmakers.com/duplicators/automated/
Please email us the serial number of the machine in question and we can send you links to the best replacement option.