The so-called soft fault often refers to some faults that are sometimes absent and difficult to find. The reasons for this kind of failure are very complex, the common ones are: solder joint welding; The band switch contact is not reliable; Component parameters are in a critical state and unstable; Ambient temperature changes, power supply voltage changes, etc.

    Soft faultThere are two ways to deal with it: one is to artificially promote the soft fault into a hard fault; The second is to analyze the suspicious parts. There are two ways to change the soft fault into a hard fault: working for a long time, making the fault part gradually deteriorate and turn into a hard fault; Twist the suspected printed circuit board, toggle the suspected component or lead, and see if the fault is aggravated.

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