Is the platter itself moving up and down or the record? It could just be the record's wear and tear (warped) which raises the tone-arm which in turn makes it move up and down on certain sections of the record. Try bending the record (very very slightly) to straighten it out or put more weight on the tonearm.
Answers & Comments
Is the platter itself moving up and down or the record? It could just be the record's wear and tear (warped) which raises the tone-arm which in turn makes it move up and down on certain sections of the record. Try bending the record (very very slightly) to straighten it out or put more weight on the tonearm.