On Mon, 10 Jun 2019 05:32:13 -0700, wrote:

If it is mechanical, it may be jammed on something caught in the gears,
or perhaps the gears have slipped. Otherwise, you may need to replace
the part.

If the main bearing is badly worn, then those teeth can come out of mesh.
I've had this with a Trio TS530s. It's a simple matter to reset the
gears, but if the worn bearing isn't dealt with beforehand it'll come out
of mesh again pretty quickly.





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