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First, the appearance of a small electronic platform scale under power off conditions, detection instrument shell, switch and keyboard is not normal, the instrument and the scale body is not broken, conditional sensor simulator can be used instead of sensors to determine the instrument failure, or Scale body failure, so that you can quickly and accurately find the fault site.
Small electronic platform scale failure analysis and solution:
1. Start whistle. The CPU computer is not working properly. It is not normal to detect the DC power supply voltage. Try a replacement of a good CPU. If there is an external program chip, you should also check the program chip and check the CPU and EPROM interface circuit.
2. There is a self-test on the boot, but the output does not light up after the self-test. The keyboard is not reset or the keyboard is damaged.
3. After the power is flashing, zero is not output. There is no load on the scale, the proximity of the sensor plug is not good, the sensor is not disconnected phenomenon, some sensors after use for some time, the resistance of the resistance strain gauge changes to cause the initial value to change, adjust the initial value.
4. The power flashes more than once. Whether the small electronic platform scale is affected by wind and vibration, is there an object close to the scale, whether the sensor plug is close to good, and whether the sensor line has an open circuit or a false connection.
5 boot does not output, no self-test. First detect whether the fuse in the power supply part is blown, and whether the 5V, 15V three-terminal integrated voltage regulator block has normal output, whether the clock pulse has a normal output, and whether the microcontroller channel is damaged. Then check whether the digital tube pin and the circuit board are not detached, and whether there is a disconnection between the latch and the driver. Output driver HA16617 integrated block is not working properly, its normal operation touch the surface by hand, there should be a slight heat feeling. The output is not burned, leaks (after the fluorescent tube leaks, the black spots on both ends turn white).
6. The function key malfunctions. First of all, to detect whether the circuit board and the button are close to the dust and moisture, if any, use alcohol to clean and dry. Check whether the connection between the keyboard and the circuit board is broken or not. When connected, the diode is not damaged, and the proximity of the six inverter 4049 pins is not solid. It is not correct to check whether the keyboard and the instrument shell are installed correctly, that is, whether the card or the squeeze affects the keyboard work.
7. Zero drift. Electronic desk scales are not well zeroed after each use, causing drift. Is it affected by external influences such as vibration, wind, and power interference? The board's insulation resistance dropped, dirt was present, and it was cleaned with alcohol. The amplifier's anti-interference ability drops and self-excitation occurs. The zero detector is faulty, and the insulation resistance of the integral capacitor is degraded and deteriorated, resulting in increased loss. The replacement experiment can be used to troubleshoot the fault.
8. Adjustment of indication error. The scale body load-bearing system is damaged due to external forces, which causes the mechanical structure to be deformed and fractured, and an angle is generated between the force axis of the sensor and the force acting force is not true, so that the weighing error should be repaired or replaced. Due to the long-term use of small-scale electronic platform scales, the elastic modulus and temperature coefficient of the sensor's elastic body will change, or errors may occur due to the different gravity acceleration in different regions. The elimination method is that some small electronic platform scales are adjusted by turning on two sets of binary switches inside the meter, some of them are adjusted by adjusting the adjustable resistance, and other small electronic platform scales are adjusted through the keyboard function keys.
9. The output is unstable and skipping. The power supply is unstable, and the AC ripple that supplies power to the integrator and the detector is too large. Double integral instability, increased loss of integrated capacitance and leakage. Sensor failure, the phenomenon of multiple measurement results are inconsistent, and zero drift, creep, with a multimeter to measure the output impedance of the sensor input, air-weighing mV signal, insulation resistance is not normal, such as the value of the excess shows more The sensor is damaged and should be replaced in time.
10. The output data of the output device fluctuates too much. That is, when the same weighing load is applied to a small electronic scale, several times the weighing output value is different. The reason is generally caused by the virtual connection of the cable between the weighing instrument and the sensor, the aging of the insulating layer, the damage of the shield, the decrease of the insulation resistance between the cores, and the excessive fluctuation of the transmission signal. Or filter capacitor and circuit board open welding, caused by virtual welding, by looking for breakpoints, re-welding. Or because the humidity in the use environment is too large, the weighing instrument is damp, and the hair dryer blows dry, and the fault can be eliminated. The characteristics of the sensor resistance strain gauge itself are not good, the adhesive agent is deteriorated, the strain gauge and the elastomer are not well bonded, and the sensor is aged. In general, the sensor is replaced.
11. When weighing is loaded, there is no weight output on the weighing output screen. No bridge voltage is applied to the input terminal of the load cell bridge, or the sensor cable socket is not close enough. The aging of the sensor signal cable causes the amplifier to lose its signal. Or there is foreign matter between the sensor and the scale body, which hinders the deformation of the elastic body.
12. Nonlinear errors. Generally, the sensor is not well installed, the spacing of the limit screw is too small, or there is foreign matter sandwiched between the bearing plate and the scale body. It is not reasonable to adjust the limit spiral to remove the foreign matter, and to check the proximity between the bearing plate and the scale body. Can be solved. There is a problem with the first-order low-pass filter of the amplifier. The R and C values ​​of the amplifier are changed, causing the interference frequency to be amplified, and the integrator gains instability of the integral waveform and adjusts the linear compensation resistance.
13. Inconsistent measurement of the four corners of the load-bearing table (four-corner error). Firstly, it is not reasonable to check if the sensor screw is tightened. If the gap between the limit screw and the scale body is not reasonable, if the above problem is still inconsistent, then the sensor can be used to gently tap the inner hole of the sensor. The principle is: to make the output smaller Corresponding side holes are thin and increase the amount of change in the elastic body. During maintenance, care should be taken not to make too many blemishes at once, and it should be gradually adjusted several times to prevent damage to the sensor.
14. Output is out of schedule. The output device and the circuit board are not close to each other. There is an open circuit in the virtual soldering, the signal transistor and latch of the PCU section are damaged, the internal short circuit of the output device, and the output device is replaced.
15. Exclusion of interference. In the industrial production process, due to the large number of electrical equipment, there is a large amount of electricity, magnetism, interference and static electricity interference in the environment of small electronic platform scales, which causes the output value of small electronic platform scales to be unstable and affect the weighing speed. The work efficiency is reduced. For this reason, we detected the filter and found that the filter was damaged. After the replacement, a dedicated voltage regulator power supply for the weighing instrument is added to the location where the environment is disturbed, and the power cable is shielded and effectively grounded. After the treatment, the effect is good.
Through the above understanding, we have already understood the problem of small electronic platform scale fault analysis and solutions. In the future, people will know how to deal with a small electronic platform scale failure. This article is provided by the Shanghai Shigan Industrial Co., Ltd. electronic platform scale Xiaobian finishing, thank you for your continued support. 
Nowadays, people use small electronic platform scales more and more frequently. Everyone in the process of use, it is inevitable that they will encounter a small electronic scales failure. What should we do in the face of the failure of small electronic scales? Do not worry, we take a look at this article on the small electronic platform scale fault analysis and solution of the article learn it.