Hi, I'm new to the site and I thank you for the opportunity to ask a question concerning my Pioneer PL-670. When I turn the unit on the arm will swing across to the record and sit down but before it can start to play the record the arm will return to the armrest and start the sequence all over again and continue to do this until you turn the power off. Any ideas of what the problem could be and how to remedy it? Thanks a million....Steve