Understanding the basic structure and principle of the weighing instruments,if you have some basic knowledge of electronic circuits,we can repair the weighing instruments.Either to repair the instrument or other electronic products,there is generally two ideas,one is to find out the problem circuit according to the fault phenomena,which is commonly used method,and is often effective.If it is a bit more complicated circuit,this method often leads to misunderstanding,the result will be less effective.At this moment we need to in accordance with the normal detection method to examine one by one,then find the problem.The steps for the investigation method of belt weigher are as follows.

( 1 ) Firstly,check power supply.Power supply is the main motivation of the entire circuit work,so check whether the power supply is normal before checking the circuit.

( 2 ) Secondly,check the input section,which is part of the small signal amplification.Put the input signal to the signal source,adjust the size of the input signal source,then see if the voltage changes regularly.

( 3 ) Thirdly,check whether the processor is working,and check whether the output of each point of is normal.

( 4 ) Finally,Check the driver circuit and other output circuits.

In the process of repairing,we should use the visual,parts removed,confirm the repair and other methods to complete our maintenance work.Just make sure which part of the circuit occurs failure and the extent of damage,then we can do the next solution to the problem.After these steps,it is basically able to identify the problem.