If the belt has worked itself loose then more than likely its worn past tightning. I don't know what type of unit you have but I would try either taking off the back of the unit or turning the unit on its side to gain access.
If the belt is loose checck to see if there is PLAY on the bearings or the motor pulley . If not the belt must be replaced as it would have gone weak. Buy one size that fits just inside the faulty sample.. must not be too tight but with a slight play.
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