1. lot of time Cause "Micro Cooling Fan" fan does not turn, are poorly maintained problem. If the power is turned off manually toggle stiff blades rotate, you should use some lubricant drip shaft, it can be lubricated, it will not affect the motivation to drag blades.
2, for the abrasion of the blade does not rotate, the most simple or replacement parts, in particular the sleeve, if the wear is easy to burn.
3. If the "Micro Cooling Fan" smaller capacitance caused by the fan does not turn, you can remove the capacitors, the same model for a new capacitor is recommended to choose a large capacitance than the original 20%, there will be a better rotation effect.
4, the shaft axial play much of a problem, you can choose to adjust the gasket after the demolition of the motor. But I remember back when the motor is installed, you must pay attention to the rotor and the bearing concentric, lubrication with screws diagonally and slowly tighten, and finally with wood to knock the shaft, make sure it concentric.
5, if it is because "Micro Cooling Fan" electrical fault, you can check the wiring of the lines, sometimes damaged wires can be repaired on the issue.