Instrument circuit fault, should be how to deal with?

Circuit failure is inevitable for the instrument. In the applications of instrument, learn and master some necessary fault detection and maintenance methods, not only can improve the production efficiency, but also can save waiting time and reduce the maintenance cost of maintenance. Today with Katie instrument equipment factory to summarize, common instrument circuit fault detection and response. Sense of observation method this is one of the most simple and most direct method, with sensory directly to judge the cause of the problem. Under normal circumstances, the damaged components changes color, burning in the vesicles or spots; The smell of burning device will produce some special; Short circuit of the chip will be hot; To view the appearance, can also be observed with the naked eye as the damage of circuit board connection, disconnection, copper foil, split, fusing device, etc. ; Touch to check whether the element is loose, integrated circuit is stuck, battery, resistor, integrated block is burning, etc. ; Can hear or smell whether have different sound and smell, appear these phenomena is not normal. Tap and hand pressure instrument is running, often, the phenomenon of the stand or fall of running, appear this kind of failure, the first consideration is caused by the virtual welding, poor contact. For this kind of condition can use percussion and hand pressure. Tapping method refers to tap the plug, if beat one of splice pieces, the normal operation of the instrument malfunction, or turned normal after the defective tap, then can judge the splice pieces of defective. Hand pressure is when failure occurs, turn off the power supply of parts and plug socket after again pressed firmly with the hand, it see if it can eliminate the fault. If found on the chassis, loosen and not normal, it is best to all joint stuck to try again later. After the static dynamic method first check circuit working condition to static after the move. Static here refers to dc job and static state, dynamic is refers to the dynamic condition. General requirements to observe whether static working condition is normal, when static work in good condition, check the dynamic working condition again. If the cause of the failure is more complex, replacing method can judge according to the experience that possible fault position and then use the same, normal splice plate or good components, especially for integrated circuit and module, replace the defective splice of suspects board or component to test failure, such as whether the fault is eliminated. Substitution method requires two same instrument or have enough spare parts. Deduction methods used in the electronic instrument, often use a method of exclusions in detection using the method is often used more common, the problems to rule out one by one, its main advantage is the ability to save a lot of time, can be more accurate and timely in complex fault will be ruled out, the failure of can in the shortest possible time to get rid of the fault occurring, the downside is that in the previous work, must be careful, otherwise it is difficult to good use, this method not only can save time, still can waste a lot of time, cannot achieve the ideal effect. So-called method is through some board inside the machine, pull device method to determine the cause of the problem. When removing a card or device instrument returned to normal, after failure there. Correlation method to select two of the same type of instrument, one of them is normal. A table, oscilloscope, such as the determination of tools for data, comparison analysis was carried out on the voltage and the output. Two meter run under the same conditions, the corresponding signal detection, the comparison of two groups of signal measurement, if there are different, you can conclude that fault source. Voltage measurement instrument in the process of normal work, the working voltage has a stable value or the scope of certain changes. If open circuit, short circuit, and so on and so forth are associated with circuit, this will make the emergence of the working voltage of the circuit change or the change of components in parameters. So you can through the voltage measurement method to the key points in the circuit voltage measurement, through the fault phenomena, and make analysis according to the working principle of instrument. Man-made fault method in detecting common electronic instrument, subjective think the detection method is a commonly used method, in addition to the affected by the objective method, is popular the subjective method of a detection method. Usually set some fault is artificially, through his set of fault, to achieve the purpose of detecting electronic instrument. This method is to point to in artificially created some faults in the circuit, such as disconnect some important components, check it before the circuit is normal, part will be a short circuit, the other part is normal.
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