1. The observation method makes use of sight, smell and touch. In some cases, the damaged components will discolor, blistering, or burn spots; burned devices will produce some special odors; short-circuited chips will become hot; visible or unwelded areas can also be observed with the naked eye. .
2, knocking hand pressure method often encounter good and bad phenomenon when the instrument is running, the vast majority of this phenomenon is caused due to poor contact or welding. For this situation, tapping and hand pressure can be used.
The so-called "knocking" is to gently hit the board or component with a small rubber head or other knocker to see if it can cause an error or stop failure. The so-called "hand pressure" is when the fault occurs, after the power is turned off, the plugged parts and the plug and the base are again pressed firmly by hand, and if the power supply is turned on, it will eliminate the fault. If it is found that when the cabinet is normal and the beat is not normal, it is better to re-insert all the joints and try again. If you are unsuccessful, you have to find another solution.
3. Exclusion method The so-called exclusion method is a method of determining the cause of failure by inserting and removing some plug-in boards and devices. When the instrument returns to normal after removing a certain board or device, it indicates that the failure occurred.
4. The replacement method requires two instruments of the same type or sufficient spare parts. Replace a good spare with the same component on the faulty machine and see if the fault is eliminated.
5, heating and cooling method Sometimes, the instrument work for a long time, or in the summer when the work environment pressure transmitter is high, there will be failure, shutdown check is normal, stop for a period of time and then boot again and normal, after a while there is a failure. This phenomenon is due to the poor performance of individual ICs or components, and the high temperature characteristic parameters do not meet the requirements of the specifications. In order to find out the cause of the fault, it is possible to use the heating and cooling method. The so-called temperature drop of the pressure sensor means that when a failure occurs, the anhydrous alcohol is wiped with a cotton fiber at a point where it may malfunction so as to reduce the temperature and observe whether the failure is eliminated. The so-called warming is artificially raising the temperature of the environment, such as using a soldering iron near the point of doubt (note that the temperature must not rise too high to damage the normal device) to see if the fault appears.
6. The comparison method requires two instruments of the same type, and one is in normal operation. Use this method must also have the necessary equipment, for example, pressure gauges, oscilloscopes and so on. According to the nature of comparison, there are voltage comparison, waveform comparison, static impedance comparison, output comparison, and current comparison.
The specific method is: let the faulty meter and the normal meter operate under the same conditions, and then detect the signals of some points and then compare the measured two signals. If they are different, you can conclude that the fault is out here. This method requires maintenance personnel with considerable knowledge and skills.
2, knocking hand pressure method often encounter good and bad phenomenon when the instrument is running, the vast majority of this phenomenon is caused due to poor contact or welding. For this situation, tapping and hand pressure can be used.
The so-called "knocking" is to gently hit the board or component with a small rubber head or other knocker to see if it can cause an error or stop failure. The so-called "hand pressure" is when the fault occurs, after the power is turned off, the plugged parts and the plug and the base are again pressed firmly by hand, and if the power supply is turned on, it will eliminate the fault. If it is found that when the cabinet is normal and the beat is not normal, it is better to re-insert all the joints and try again. If you are unsuccessful, you have to find another solution.
3. Exclusion method The so-called exclusion method is a method of determining the cause of failure by inserting and removing some plug-in boards and devices. When the instrument returns to normal after removing a certain board or device, it indicates that the failure occurred.
4. The replacement method requires two instruments of the same type or sufficient spare parts. Replace a good spare with the same component on the faulty machine and see if the fault is eliminated.
5, heating and cooling method Sometimes, the instrument work for a long time, or in the summer when the work environment pressure transmitter is high, there will be failure, shutdown check is normal, stop for a period of time and then boot again and normal, after a while there is a failure. This phenomenon is due to the poor performance of individual ICs or components, and the high temperature characteristic parameters do not meet the requirements of the specifications. In order to find out the cause of the fault, it is possible to use the heating and cooling method. The so-called temperature drop of the pressure sensor means that when a failure occurs, the anhydrous alcohol is wiped with a cotton fiber at a point where it may malfunction so as to reduce the temperature and observe whether the failure is eliminated. The so-called warming is artificially raising the temperature of the environment, such as using a soldering iron near the point of doubt (note that the temperature must not rise too high to damage the normal device) to see if the fault appears.
6. The comparison method requires two instruments of the same type, and one is in normal operation. Use this method must also have the necessary equipment, for example, pressure gauges, oscilloscopes and so on. According to the nature of comparison, there are voltage comparison, waveform comparison, static impedance comparison, output comparison, and current comparison.
The specific method is: let the faulty meter and the normal meter operate under the same conditions, and then detect the signals of some points and then compare the measured two signals. If they are different, you can conclude that the fault is out here. This method requires maintenance personnel with considerable knowledge and skills.
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