Analysis of common problems of electronic loadometer

Electronic loadometer is composed of weighing sensor, communication interface circuit, AD conversion circuit, display circuit, amplifier circuit, keyboard circuit,SCM circuit, voltage regulator power supply circuit and so on. We use electronic loadometer in the process will appear a variety of problems or faults.There are many kinds of electronic loadometer failures, divided into hardware and software parts, the following specific analysis: 1. How to do with poor display of electronic loadometer? A. Check whether the line between the CPU and LCD is disconnected. B. Check whether the LCD pins and holes are oxidized, cold-welded, or short-circuited. C. Connect the normal LCD connector in parallel on the LCD of the maintenance scale by hand, and then turn it on and observe whether there is the same abnormal condition on the normal LCD , if not, it can be concluded that the LCD is poor. 2 electronic loadometer can not boot how to do? A. Check whether the fuse, power supply or switch, power cable, and voltage switch are faulty. B. Remove the battery and start it with AC power to check whether the battery voltage is low. (Measure the battery voltage, high If it is below 5.5V, and the battery will run out soon after being fully charged, please replace the battery. C. Check whether the transformer has ac110/220 input and AC18V output. 3. What should I do if the key of the electronic floor scale fails A. Please update K/B test first, if the new K/B function is normal, it can be judged as K/B bad. B. Check whether the line between K/B and CPU is disconnected or cold welded. C. Check K/B pedestal for poor contact signs. D. Measure whether the diode on the K/B circuit and CPU circuit is short-circuited or disconnected. 4. It cannot be weighed with full load A. Check whether the output signal value of the sensor is within the standard.