22B-D6P0N204
22B-D6P0N204
所谓逐步缩小法，就是通过对故障现象的分析和测量参数的判断，逐步缩小故障的范围，终落实到引起故障的具体电路或元件上。本质上是一个肯定、否定、再肯定、再否定、后肯定(判断)的判断过程。
例如，在通电后，发现操作面板上没有显示。首先，判断没有直流电源（其直流电源电压可以用万用表测量）。经进一步检查，发现高压指示灯亮（通过测量PN电压进一步确认），主电路高压电路故障被拒绝。向操作面板供电的开关电源存在问题。如果测量电源的交流电压正常，没有直流输出和短路，则可以确定电源电路的整流管损坏。本示例采用典型的逐步缩小方法。整个过程是通过分析和参数测量来判断、确定和否定几轮，终确定整流管损坏。
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