Common Faults and Repair Methods of Electronic Balance

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Common Faults and Repair Methods of Electronic Balance [Copy link]

Common faults and repair methods of electronic balances Generally, electronic balances have a fault tracing function. A normal electronic balance will display CHO~CH9 when it is turned on, and then display the zero position 0.00….g. The precision is different, and the number of digits retained in the zero position is different. In addition, electronic balances have various other fault codes "E1"~"E8", "H", "L", etc. If any of the above codes appear, it means that the balance has a fault. Only by finding the cause of the fault in a targeted manner can the problem be solved smoothly. Over the past few years, the author has explored some experience in practical work, which can quickly and accurately debug and repair. Fault phenomenon 1: The balance displays "CH2" (1) When the balance is not opened, first check whether the balance pan is intact and whether there is any friction, and then turn on the machine to handle it? (2) Open the balance shell, check whether the internal connectors of the balance are loose, whether there is anything rubbing against the sensor, re-plug the connectors, and turn on the machine to check and handle it. (3) There is a problem with the A/D converter of the electronic balance. Repair or replace the A/D. (4) There is a problem with the microprocessor of the electronic balance . (5) When the power is turned on and off, observe whether the sensor works. If the sensor does not work, consider whether the gold wire on the sensor is broken or whether the zero position detection grating position has changed. The grating position can be moved up and down to adjust it to the best state. (6) For electronic balances with internal calibration function, the internal calibration weight may fall off or get stuck. It can be adjusted and repaired. (7) There is a CA3130 integrated block on the analog board that is broken. It can be replaced with a new one. Fault phenomenon 2: The balance displays "CH7" . Most of the dedicated memory is broken, such as 2506 (2401) \ P25 (P26) ... Fault phenomenon 3: The balance displays: "CH5" (1) When the balance is turned on, the user operates improperly. The power should be turned off and then turned on again. (2) There is a problem with the connectors or dedicated control board of the electronic balance. Check the connectors and make sure they are connected correctly and firmly. Repair or replace the dedicated control board. Fault phenomenon 4: The balance displays "E2"