1, the first mouth and then hands: dry electric mixer appeared with the story, not emergency dry first hands, should be asked before and after the failure and the story with the phenomenon, for the rusty equipment, should be familiar with the circuit principle and structural characteristics, comply with the corresponding rules. Before disassembling, we should be fully familiar with the function of each electrical component, location, connection and the relationship with other devices around, in the absence of assembly diagrams, should be disassembled while drawing sketches, and marking.

2, first external and then internal: should first check the equipment for obvious cracks, defects, to understand its maintenance history, age, etc., and then check the machine. Demolition should be excluded before the periphery of the failure factors, to determine the failure of the machine can be disassembled, otherwise, blindly disassembled, the equipment may be more and more bad repair;

3, first mechanical and then electrical: only after determining the mechanical parts are not faulty, and then the electrical aspects of the inspection. Check the circuit failure, should use testing instruments to find faulty parts, to confirm that there is no poor contact failure, and then targeted to view the line and the mechanical operation of the relationship, so as to avoid misjudgment;

4, first static after dynamic: in the equipment is not energized, to determine the electrical equipment buttons, transformers, thermal relays and Fuse good or bad, so as to determine the location of the fault, energized test, listen to its sound, measure the parameters, to determine the fault, and then carry out maintenance. Such as in the motor phase, if the measurement of the three-phase voltage value can not be judged, it should listen to the sound, individually measured each phase ground voltage, in order to determine which-phase defects.

5, first clean after maintenance: the more heavily polluted electrical equipment, the first button, wiring points, contact points for cleaning, check whether the external control keys are out of order, many failures are caused by dirty and conductive dust block; 6, first power after the equipment: the power supply, the equipment, the equipment, the equipment, the equipment, the equipment, the equipment, the equipment, the equipment, the equipment, the equipment, the equipment and the equipment.

6, after the first power supply equipment: power supply part of the failure rate in the whole faulty equipment accounted for a high proportion, so the first overhaul of the power supply can often get twice the result with half the effort;

7, the first after the debugging accompanied by the story: for the debugging and faulty co-existing electrical equipment, should be excluded first, and then debugging, debugging must be carried out under the premise of the electrical line speed;

8, first bragging after the special: due to the quality of assembly parts or other equipment caused by the death of the company, generally accounting for about 50% of the common death of the company, the special electrical equipment for the soft death of the company to rely on experience and instrumentation to measure and repair;