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Follow the power, start looking wherever the power stops. Sometimes it can help to reverse phase & neutral to track where the power stops from the other side too. You are only doing this for testing purposes and need to put it back as it should be when you're done.
Hi. You have a broken gear in the gearbox either the first motion gear is loose on its shaft or less likely the vertical big gear is loose on its shaft. independent spares for the gearbox are available or complete gearbox
sounds like the motor armature is burn. Dissemble the unit, remove the motor. Loosen the bolts running from end to end of the motor and with emery cloth, clean the small metal plates on the ehd of the armature. They should be bright copper colour. I the armature is burnt, they will be dull brown. The other thing is to replace the brushes in the motor.