How to repair a NSM Jukebox?

I have a NSM jukebox that plays 45's. The lower portion of the jukebox has an open front that shows the 45's and the carousel. The carousel will reach a certain point in the row of records then stop and will continue to select the record and return it after playing it over and over again. What do I have to do in order to get the carousel to play each selected 45's once and thencontinue to the nnext record without freezing on one record???