Tarzan fast and accurate weighing find out cause of the malfunction of electronic truck scale because of its convenient, fast, accurate, and intuitive features in the application of the national economy has become increasingly widespread. How to maintain various types of electronic truck scale, and due to system failure affect the use, can quickly and accurately find out the cause of the malfunction and shorten the repair time, which is the electronic truck scale of great concern to the user through this analysis can allows users to have a preliminary failure analysis and determine and solve the problem as soon as possible. System in general by weighing indicator, weighing sensors, mechanical structure composed of several parts, its common failure is mainly divided into weighing indicator weighing sensor faults and failures into two categories. Due to electronic truck scale structure is simple, when a failure can not determine the reason for this exclusion can be find out the reasons, the specific method is first weighing indicator of sensor inputs removed, replaced analog sensors, the display of the instrument to observe determine whether the instrument failure. Due to a variety of electronic truck scale weighing indicator whether the instrument failure. Due to a variety of electronic truck scale weighing indicator varies, circuit design, each with its own characteristics, there is not a fault of the display instrument analysis, the user should be based on its own analysis using the meter. Ground potential of electronic truck scale of these changes can bolt through the device, the device itself and the sensor is installed at the end position, the incoming sensor housing, charged capacitively coupled to the housing through the distribution of strain gauge load cell inside the car, allowing the sensor output signal interference. Despite the use of the differential input preamplifier, but internal component parameters can not be absolutely symmetrical, so that the amplified signal also the existence of such common mode noise interference.