The use of electrical equipment is becoming more and more frequent and widespread, and the problems it causes are also increasing. So, how can we repair it to ensure it operates in a better condition? Safety is ensured, the equipment operates under normal conditions, achieving twice the result with half the effort. This is why strict maintenance of electrical equipment is necessary.

❶. Speak first, then act. 

For faulty electrical equipment, one should not rush to take action. Instead, one should first inquire about the sequence of events leading to the failure and the specific symptoms of the malfunction. 

For unfamiliar equipment, one should first familiarize themselves with the circuit principles and structural features, and abide by the corresponding rules. Before disassembling the equipment, one must fully understand the functions, positions, connection methods of each electrical component, as well as its relationship with other surrounding devices. When the electrical equipment has no assembly diagram, one should draw a sketch while disassembling it and make notes. 

❷. Start from the outside and then move to the inside. 

First, check whether the electrical equipment has obvious cracks or damages, and understand its maintenance history, service life, etc. Then, conduct an inspection inside the machine. Before disassembling, identify the fault factors around the machine and only disassemble if it is determined to be an internal fault. Otherwise, if you disassemble blindly, it may make the electrical equipment worse. 

❸. First mechanical, then electrical 

Only after confirming that the mechanical parts are free from faults can the electrical inspections be carried out. When checking for circuit faults, detection instruments should be used to locate the faulty area. After confirming that there are no adverse faults, a targeted examination of the relationship between the circuit and the mechanical operation should be conducted to avoid misjudgment. 

❹. Start with the static then move to the dynamic. 

When the electrical equipment is not powered on, check the quality of the equipment buttons, contactors, thermal relays and fuses to determine the location of the equipment failure. Conduct an energized test, listen to the sound, measure the parameters, and determine the fault. Then, carry out the repair. For example, when an electric motor is lacking a phase, if the measurement of the three-phase voltage values cannot determine the situation, one should listen to the sound and measure the voltage of each phase relative to the ground separately to determine which phase is defective. 

❺. Clean first, then repair. 

For the electrical equipment with severe pollution, first clean the buttons, connection points and contact points, and check whether the external control keys are malfunctioning. Many faults are caused by dirt and conductive dust particles. Once cleaned, the faults will often be resolved.