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So here’s my guess.
The tone arm is mounted on sled that is driven by long threaded rod.
Unlike the 8000 series turntables, the threaded rod is not fixed on both ends and so can become mis-aligned.
The rod is held in place only on the right end of where it is terminated by a bracket and pulley (where the sled motor is). If the bracket has come loose and the rod is misaligned then what happens it the sled can only go partially across the record.
The sled rides across a fixed polished rod. The fixed rod and the threaded rod needs to be reasonably parallel across to each other. If not at some point the divergence between the two becomes to great and so the sled can no longer move.