Regarding rewind problem

Dear Sirs,

This is to kindly let you know that I am a professional camera technician. Presently I am having Sony CCD-TRV12 Hi8 camcorder under repairing. The problem is that when I insert the camera the play system works well. The FF system also works well. But as soon I push the rewind button, the mechanism stops after few seconds and the entire camcorder hangs up. None of the any function works until I eject the cassette. The eject icon appears on the screen. Other wise all other functions works well. Please help me in this matter. Thanks

Heero