Rockola 468-2

new to this . got a rockola 468-2, works pretty well but selector doesn't.... first two digits seem good but third digit does nothing above 4. also tone arm does not lift off disk at end. can't find the adjustment which i am sure there must be one.. haven't been able to get hold of a manual so far.. any ideas suggestions gratefully received.

add to above.... if i manually set a pin then everything seems to work ok..