The electronic scale consists of: load cell , operational amplifier, A/D conversion integrated circuit, intelligent single chip microcomputer, display drive and display circuit, keyboard circuit, multi-function interface circuit, AC/DC/charge/storage/stabilization circuit. The electronic fault is also very strange, but it does not change its ancestry. As long as you master certain rules, the fault of the electronic scale is still very easy to solve. Today, I have compiled some more comprehensive electronic scale failure and repair methods for everyone:
1, the electronic scale does not return to zero (do not return to zero, do not weigh)
a. Check if the sensor output signal value is within the standard. (A/D total enlargement code / use inner code range / bottom code range)
b. Not within the standard, please refer to the tenth item for compensation.
c. If it is impossible to compensate, please check if the sensor is defective. (Please check according to the eighth item)
d. Please follow the instructions to do weight correction.
2, the electronic scale said the weight is not allowed
a. Observe whether the internal code value is stable, whether there is friction in all parts of the sensor, whether the stabilized power supply is stable, whether the operational amplifier circuit is normal, whether the circuit board of the A/D circuit has foreign matter, and whether the feedback resistor/capacitor/filter capacitor is defective or Leakage.
b. Check if the sensor output signal value is within the standard.
c. Not within the standard, please refer to the tenth item for compensation.
d. Use the weight to test whether the scale of the weighing pan is average. (If it is not average, please refer to the ninth item for grinding scale)
e. Please follow the instructions to do the weight correction.
3, the electronic scale can not be turned on
a. Please make sure that the problem is not caused by the fuse, power switch, power cord and voltage switch.
b. Check if the transformer has AC110/220 input and AC18V output.
c. Please remove the battery and turn it on with AC power to find out if it is caused by insufficient battery voltage. (To measure the battery voltage, it should be higher than 6V. Please charge if it is lower than below. If it is lower than 5.5V, please replace the battery when there is no power soon after charging.)
4, electronic scale display is bad
a. Put the normal LCD pin in hand on the maintenance scale LCD, and then turn on the power to observe whether the normal LCD has the same condition. If not, it can be judged as LCD failure.
b. Check the CPU pins for oxidation, cold soldering or short circuit.
C. Whether the pins and holes of the LCD are oxidized, cold welded or short-circuited.
d. Check if there is any open circuit between the CPU and LCD.
5, the electronic scale button is bad
a. Please update the K/B test first. If the new K/B function is normal, it can be judged as K/B.
b. Measure whether there is any open circuit or cold welding between the K/B and the CPU.
c. Check if the K/B foot has a bad contact, and measure whether the K/B and the diode on the CPU circuit are short-circuited or open.
6, the electronic scale can not be said to be fully loaded
a. Check if the sensor output signal value is within the standard.
b. Not within the standard, please refer to the tenth item for compensation.
c. If it is impossible to compensate, please check if the sensor is defective. (Please follow the eighth item for testing)
d. If there is instability or compensation after compensation, please replace the sensor.
e. Check that there is interference from wireless materials or protective devices inside.
f. Is the battery voltage above 6V?
g. Replace the L/C test for poor sensor.
7, electronic scale battery can not store electricity
a. Please make sure that the problem is not caused by the fuse, power switch, power cord and voltage switch.
b. Check if the transformer has AC110/220 input and AC18V output.
c. Remove the battery from the board and take the PIN to measure whether the charging voltage of the machine is about 7.2V. If not enough, please check the power supply related circuit.
d. Check the machine version, whether the diode near the input terminal of the transformer is normal.
e. Replace the battery.
The above description basically covers all the fault problems and maintenance methods of the electronic scale , and hopes to help you quickly solve the problem of the electronic scale failure.
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