1, knocking hand pressure method
The phenomenon of good or bad operation of instrumentation is often encountered. The majority of this phenomenon is caused by poor contact or welding. For this situation, tapping and hand pressure can be used.
The so-called "knocking" is to lightly hit the board or component with a small rubber hoe or other knocker to see if it will 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 seat are re-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.
2, observation method
Uses sight, smell, 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. .
3, elimination method
The so-called exclusion method is to determine the cause of the fault 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, replacement method
Two identical instruments or enough spare parts are required. Replace a good spare with the same component on the faulty machine and see if the fault is eliminated.
5. Comparison method
Two instruments of the same type are required and one is in normal operation. Use this method also has the necessary equipment, for example, multimeter, oscilloscope and so on. According to the nature of comparison, there are voltage comparison, waveform comparison, static impedance comparison, output comparison, and current comparison.
The phenomenon of good or bad operation of instrumentation is often encountered. The majority of this phenomenon is caused by poor contact or welding. For this situation, tapping and hand pressure can be used.
The so-called "knocking" is to lightly hit the board or component with a small rubber hoe or other knocker to see if it will 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 seat are re-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.
2, observation method
Uses sight, smell, 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. .
3, elimination method
The so-called exclusion method is to determine the cause of the fault 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, replacement method
Two identical instruments or enough spare parts are required. Replace a good spare with the same component on the faulty machine and see if the fault is eliminated.
5. Comparison method
Two instruments of the same type are required and one is in normal operation. Use this method also has the necessary equipment, for example, multimeter, oscilloscope and so on. According to the nature of comparison, there are voltage comparison, waveform comparison, static impedance comparison, output comparison, and current comparison.