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First check the power socket, plug, power cord of the universal grinder, whether there is oxygen falling off or break. If not, plug in the power test machine. When the universal grinder motor is energized, do not rotate, and turn the wheel and turn it by hand. At this time, it can be concluded that one of the two starting capacitors of the machine has a capacity failure. In this case, only new products are generally exchanged.
In another case, the power is not rotated, and an external force can be applied to rotate but a weak current is emitted in the motor, which is caused by a slight leakage of the starting capacitor. If the current is too loud, the motor will not start at all, and it is determined that the starting capacitor is short-circuited (the motor coil is short-circuited and needs professional repair). In the absence of professional equipment, the capacitor (4UF/400V) can be removed first, and the two leads are respectively inserted into the zero and fire line jacks of the mains to charge the capacitor, and then the two leads are short-circuited and discharged. If the discharge spark can be emitted at this time and there is a loud "beep" sound, the capacitor can be used; if the spark and the sound are weak, the capacity of the capacitor has dropped, and it is necessary to replace it or add a small capacitor. If the capacitor of the universal crusher has been damaged, the method cannot be used, and it must be replaced with a new product of the same specification.
How to check if the universal grinder is not working?