B & O TX Tunrtalbe help needed.

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My Tx turntable is acting up. The arm lowers on the record and starts to play but the carriage does not move and the arm slowly creeps towards the other photo arm while the other arm is stationary. I have the repair manual. Any help would be greatly appreciated.
 
The little belt that drives the carriage and is attached to the threaded rod is fine. The arm will self power to the record and can be cued all the way to the end and back. The issue is that when it is cued on the record and starts to play the carriage does not move in unison with the arm and stays stationary. I suspect it is a photo sensor issue but not sure what to look for.
 
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