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GM100 RA motor/worm gear works, but setting circle does not move

 

New owner of a blue GM-100, S/N 0082.

Here's my problem: The RA motor works, and I can see the worm gear turn either direction, but the setting circle never moves.

The Dec motor worked last week, and I could see the belt move. Now it makes a clicky sound but the belt does not move.?

The 492 unit appears to be in solid working order. I have a couple other 492s, so I could swap one out and see if that makes a difference.?

The clutches work smooth and easy with no slop.?

What should I check out next?
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