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Tension on the belts is maintained by 3 screws that locate and secure the motors inside the mount head. If one or more of these has come loose, the belt may have lost tension and be slipping. The other possibility canvassed in other replies is the small grub srews holding the pulleys on their shafts.
I would suggest removing the plate covering the motors. Run the mount using the hand controller and drive it in both Dec and RA. You'll quickly see whether there is slippage on the belts or the small gears and be able to diagnose it from there.
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