Electronic weighing instrument failure inspection method:
The correctness of the fault-checking method in the maintenance work is very important to quickly and accurately determine the location of the fault and repair it. The maintenance personnel of scales are familiar with the operation and structural principles of electronic scales. They must also be able to correctly use measuring instruments and master the basic repair methods for scales. Here are some common troubleshooting methods:
1. Intuitive method
There are many components on the main circuit board of the electronic scale, and many failures are caused by short circuit, open circuit, poor contact of the plug connector, and open welding of the component tube corner. Therefore, when the pricing scale fails, you should first use the intuitive feeling: visual, hearing, smell, touch and other methods to check the circuit board.
2. Comparison and alternative methods
In the event of a fault check, the instrument can be used to compare the electronic scale with the faulty scale so that the fault point can be detected quickly. In addition, if components such as sensors, circuit boards, power supplies, and keyboards that are prepared at work are suspected to damage a sensor, circuit board, power supply, keyboard, etc., replace them with prepared parts and observe whether the results have changed. Normally, there is a problem with the original component. Comparison and alternative methods can quickly and accurately determine the point of failure.
3. Voltage measurement
The electronic balance measures the operating voltages of the circuit elements and the chip corners of the chip and compares them with the normal values. The place where the fault is located is where the voltage changes greatly.
4. Short circuit and open circuit method
The short circuit method is to short circuit a certain part of the electronic scale and then through the oscilloscope or multimeter test results to determine the point of failure. Open circuit method is to disconnect a part of the circuit, and then measure the resistance, voltage or current through the multimeter to determine the fault point.
♦ Electronic weighing maintenance instructions ♦
Maintenance personnel must have some basic theoretical knowledge and understand the verification procedures. Because the other parts of the electronic scales used by different manufacturers are not the same and the lines are also different, the maintenance personnel cannot disassemble the scales without clarifying the working principle of the scales. Should first read the manual of the scale carefully, study the circuit diagram, have a certain understanding of the working principle of the scale, the role of each part of the logic circuit, clarify the disassembly method of the scale, be familiar with the structure of the electronic scale , the connection form and the assembly of the connector. Relationship, then analyze the failure and start repair work.
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