The ETX 80 doesn't have hard stops in it. That starts with the 90mm. My guess would be that a wire has gotten in the way. Either that or some sort of trash has gotten in the gears. Something is causing it to bind. You could try turning the mount several revolutions in both directions to redistribute the grease and maybe work out the trash if it is the problem. If you wind up cutting a wire into, then you will know what the problem was, and it will be easy to fix.
Celestron C9.25. Atlas EQG mount. Canon 500D unmodded, Celestron ST80 guide scope, SSAG, Meade 6.3 FR, Thousand Oaks dew control with Dewnot straps. Zhumell 8/24mm Zoom, 2"Gso Superview 42mm, Meade 2"QX wide angle 30MM, Meade 1.25 EP and filter set. Tasco 10x50 Zhumell 20x80 bino and a few other odds and ends.
Now where did I put that clear sky button!
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