The alternative method, also known as the trial-and-change method or the substitution test method, is a method for finding faults by using parts of the same type for suspicious components, components, boards, plug-ins, and even half machines.
When repairing electrical appliances, components, printed circuit boards, and plug-in unit components of the same type, specification, and structure are usually used first, and the components, printed circuit boards, and plug-in unit components that are in doubt are temporarily replaced. If the fault disappears, there is a problem with the replaced part, and then further check the cause of the fault. This is very helpful for narrowing the detection range and determining the quality of components, especially for fault detection of complex electrical appliances.
This method is applicable under the following conditions: 1 with backup parts; 2 with the same type of electrical appliances; 3 with identical structural components. The direct purpose of applying this method is to narrow down the fault range, and it is not always possible to determine the cause of the fault immediately, but it creates conditions for further determining the cause of the fault.
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