Introduction to the steps and skills of circuit board maintenance technology
2022-04-14
Circuit board maintenance technology is a relatively high-end and complicated technology. Books and articles on circuit board maintenance are very scarce. If you want to learn this technology well without the advice of a master, it is difficult to learn it by self-study. Guangzhou Keyu's trainer thinks: "If you want to learn circuit board maintenance technology well, we must lay a solid foundation, be familiar with every electronic component in the circuit board, master the composition structure and working principle of each unit circuit in the circuit board, and combine with practice to master maintenance skills". In general, master circuit board maintenance technology can follow the following steps to learn:
Circuit board repair entry stage. First of all, we should be able to understand each electronic component in the circuit board, be familiar with the function characteristics of each electronic component, code in the circuit diagram and on the circuit board, application, good or bad detection, etc., and then master the circuit structure, characteristics, performance parameters, failure mechanism, etc. in the circuit board. Finally, master the use of common instruments, maintenance tools skills, you can begin to repair the circuit board.
Circuit board maintenance practice stage. This stage is to improve the circuit board maintenance skills of a stage, mainly reflected in the maintenance speed. At this time, it is necessary to improve the knowledge of the composition, working principle, function, fault diagnosis process, and maintenance skills of various circuit structures in the circuit board. To master the basic routing of each electronic component in the circuit board, you can draw the working principle diagram of the circuit board according to the actual object, and be able to analyze the ins and outs of the signal, the supply of power, etc.
Circuit board maintenance actual combat phase. This stage requires more hands-on maintenance of various faulty circuits, summarizing the rules of fault occurrence, finding fault skills, learning to write maintenance technical articles, etc. Through maintenance of a large number of faulty circuit boards, accumulated rich circuit board maintenance experience, and became a hardware maintenance engineer of weak current control system of equipment with excellent technology.
1. look first and then measure: the circuit board to be repaired should be visually inspected first. If necessary, but also with the help of a magnifying glass observation. It mainly depends on: 1. Whether there is disconnection and short circuit; In particular, whether the connecting wires of the printed circuit board on the circuit board are broken and adhered. 2. Whether there is disconnection among relevant components such as resistors, capacitors, inductors, diodes, triodes, etc. 3. Whether there are problems such as virtual welding, leakage welding, wrong insertion and reverse insertion, etc.
2. outside first and then inside: When using the circuit on-line maintenance tester for inspection, if the situation permits, it is best to have a good circuit board as the same as the board to be repaired as a reference. Then use the tester's two-bar VI curve scanning function to perform a good and bad contrast test on the two boards. The initial comparison test point can start from the port of the circuit board; then from the surface to the inside, especially the comparison test of the capacitor. This can make up for the multimeter online difficult to measure whether the capacitor leakage defects.
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