Quote:
Originally Posted by Olorin67
there should be a part associated with the rotation of the tonearm that has 3 steps or stops on it to stop the motion of the tonearm swing at one of the 3 record sizes. this part should move when you move the size control. make sure all the parts associated with that are moving free. on many changers there is a friction clutch action on the tonearm movement, to prevent damage if something or someone obstruct the motion of the tonearm during the change cycle. don't get grease on that or the tonearm wont move.
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Most BSRs used a pot metal (grey in color, later BSRs were Delrin white plastic) cam gear for tonearm movement - the pathways and the extent of travel are determined by the record size setting.
Clean the pathways in the cam gear with a good degreaser - Naptha works well, as does WD-40. After cleaning and degreasing, use GC Phonolube or a similar grease (I'd stay away from lithium grease, it reacts with the porous potmetal) and cycle the changer with some 45s to make sure it lands properly, then some LPs. The landing can be slightly adjusted with a screw at the tonearm base.
We used a GC record changer stand to repair the changers - they are pricey these days - last one sold for over a hundred on fleabay.
Cheers,