In order to avoid less detours in the secondary equipment failure to find, must be calmly analyzed from start to finish according to the characteristics of the fault phenomenon, that is to say, to analyze the judgment, the comprehensive use of the theory on the basis of any blind impatience, brute force are not able to solve the problem, and even the more you check the more confused. To this end, the following aspects must be followed:
1. Familiarize yourself with the circuit principle. When an equipment electrical control system failure . Do not be in a hurry to dismantle, first of all, to understand the cause of the failure of the electrical equipment, through, scope, phenomenon, familiar with the basic working principle of the equipment and electrical system, analyze each specific circuit. Figure out the principle of the interconnection between the components and signals in the circuit of the ins and outs, carefully analyze. Combined with practical experience. After careful thought, to determine a scientific overhaul program.
2. First power after mechanical. Electrical equipment are based on the principle of electrical a mechanical, especially electromechanical instrumentation integration of advanced equipment, mechanical and electronic in the function of organic cooperation, is a whole two parts. Often the power supply failure, affecting the mechanical system, the function of many mechanical transmission components will not work. Therefore, do not be confused by the surface phenomenon, the failure of the electrical system is not all electrical itself, there may be mechanical components failure caused by.
3. First simple, then complex. First, the overhaul of the fault should be the first with the most simple and easy to use, the day has been the most skillful way to deal with, and then use complex, precise method. Secondly, when troubleshooting, the first to eliminate intuitive, obvious, simple and common faults, and then eliminate the higher difficulty, not dealt with the difficult faults.
4. First external inspection. After the internal processing. External means exposed to the shell of electrical equipment or seals on the outside of the various switches, buttons, jacks and indicators. Internal refers to the electrical equipment shell or seal inside the printed circuit board, components and various connection wires. First external debugging, after the internal processing, that is, without disassembling the electrical equipment, the use of electrical equipment panel switches, knobs, buttons and other debugging checks, compression of the scope of release. First rule out the failure caused by external components, and then overhaul the failure of the machine, try to avoid unnecessary disassembly. If necessary to dismantle, must be mechanical, electrical connection complex related components, terminals to mark, in order to prevent errors in the resumption of installation.
5. First static test, after the dynamic measurement of "static" refers to the occurrence of faults in the absence of power, electrical equipment overhaul; "dynamic" refers to the power of the electrical equipment overhaul. Many electrical equipment failure overhaul, can not be immediately energized, if energized, it will artificially expand the scope of the failure, burn more components, resulting in undeserved losses. Therefore, before the faulty machine is energized, the measurement of resistance is carried out, and the necessary measures are taken before the machine is energized for overhaul.
6. First utility circuits, after the specialized circuits of any electrical system utility circuits out of order, its energy, information can not be transmitted, distributed to the specific circuits, specialized circuits, the function of the performance will not work. If the power supply of an electrical device fails, the whole system can not operate normally, to a variety of specialized circuits to transfer energy, information is impossible to achieve. Therefore, only to follow the first public circuit, after the order of specialized circuits, in order to quickly and accurately troubleshoot electrical equipment.
7. First overhaul of the disease, after the attack on miscellaneous electrical equipment is often prone to the same type of failure is the "disease". As the common disease is more common, the accumulated experience is rich, so you can quickly exclude, so that you can focus your efforts and time to exclude the more rare, difficult, odd troubleshooting, simplify the steps, narrow the scope, targeting, and improve the speed of repair.