Generally, the fan has a big problem, so you can replace it with a new fan. If the fan blade turns stiff by hand after turning off the power, you should use some lubricating oil to drip into the rotating shaft so that it can be lubricated, so that it will not affect the motor to drag the fan blade. If the capacitance is small, replace the capacitance in the fan. We can see the capacitance after removing the housing of the motor after the fan, and we can replace the capacitance of the same specification, The capacitance can also be a little larger than the original capacitance, but not more than 20% of the original capacitance. If the motor is removed and the axial clearance of the shaft is too large, it should be adjusted by adjusting the gasket.
When installing the motor, the rotor must be concentric with the bearing, and the screw should be tightened slowly diagonally, and then knock the shaft with a screwdriver to make it concentric. It is easy to disassemble the motor, but it is not easy to install it back at will. Do not happen the above situation, or directly repair it. If the fan noise is caused by sundries interference, check whether there are sundries interference in the fan blade, If there is interference in the consumable line, it should be cleaned, and the ash can also be cleaned.
In addition, if the fan blade is damaged or broken, it will also cause fan noise. If this problem occurs, you can replace it with a new fan, and finally check whether the screw fixing the fan is too tight. If it is too tight, you can loosen it properly. Sometimes the screw fixing the fan is too tight, which will cause slight deformation after installing the fan, and there will be slight noise between the fan and the frame.
