Method 1: Comparison method The specific method is: let the faulty instrument and the normal instrument run under the same conditions, and then detect the signals at some points and compare the two sets of signals measured. If there are differences, you can conclude that the fault is here. This method requires maintenance personnel to have considerable knowledge and skills. Two instruments of the same model are required, and one instrument is operating normally. Use this method 1: The specific method of the comparison method is: let the faulty instrument and the normal instrument run under the same conditions, and then detect the signals at some points and compare the two sets of signals measured. If there are differences, you can conclude that the fault is here. This method requires maintenance personnel to have considerable knowledge and skills. Two instruments of the same model are required, and one of them is operating normally. To use this method, you must have the necessary equipment, such as a multimeter, an oscilloscope, and so on. According to the nature of comparison, there are voltage comparison, waveform comparison, static impedance comparison, output result comparison, current comparison, etc. Method 2: Capacitor bypass method Shaoxing Zhongyi Electronics reminds you that when a certain circuit produces a strange phenomenon, such as a display disorder, you can use the capacitor bypass method to determine the part of the circuit that is probably malfunctioning. Method 3: Isolation method The fault isolation method does not require the same type of equipment or spare parts for comparison, and is safe and reliable. According to the fault detection flow chart, segmentation and encirclement gradually narrow the fault search range, and then with signal comparison, component exchange and other methods, the fault will generally be found quickly. Method 4: Percussion method often encounters the phenomenon of ups and downs when the instrument is running. Most of this phenomenon is caused by poor contact or virtual welding. For this situation, percussion and hand pressure can be used. The so-called 'knock' is to tap the plug-in board or component lightly with a small rubber squeeze head or other knocking objects to see if it will cause an error or shutdown failure on the part that may cause a failure. The so-called 'hand pressing' means that when a fault occurs, the components, plugs and sockets that are inserted after the power is turned off are pressed firmly by hand, and then the power is turned on to try whether the fault will be eliminated. If you find that it is normal to tap the case, and then it is not normal, it is best to re-plug all the connectors and try again. If it is not successful, you have to find another way. Method 5: State adjustment method Generally speaking, before the fault is determined, do not casually touch the components in the circuit, especially the adjustable devices, such as potentiometers. However, if the paperless recorder takes measures to re-reference in advance (for example, make a position mark or measure the voltage or resistance value before it is touched), it is still allowed to touch if necessary. Maybe the fault will be eliminated sometimes after the change. The power and ground of the IC; connect the transistor circuit across the base input or collector output, and observe the effect on the failure phenomenon. If the capacitor bypass input of the color paperless recorder is invalid and the fault disappears when its output is bypassed, it is determined that the fault has occurred in this level of circuit
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