The following have to do is to "Mini Air Cooling Fan" bearing cleaning refueling. Must be thoroughly cleaned before filling the cooling fan, cooling fan or else directly after refueling would be extremely unstable. The method is first stator and rotor dust, then rinse. Cleaning "Mini Air Cooling Fan" approach is the first rotor shaft root "O" shaped small rubber ring is removed and cleaned with ethanol to clean it, and then not into alcohol rotor with cotton scrub clean after removal, set into "O" shaped rubber ring and set aside to dry and set aside. After that, then wash "Mini Air Cooling Fan" stator. Wash stator to note that alcohol can not let coil contact, otherwise the film surface coil will be dissolved, resulting in damage to the coil.