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与微机的其他部件相比,电源部分使用的分立元件比重较大,故障率也相对较高,这也为维修人员提供了一比较适合自己动手修理的机会。只要熟悉脉宽调制型开关电源的基本组成和工作原理,在没有电路图的情况下,根据实物也能了解该电源的工作原理,比较容易动手。现举例如下: 例1 保险丝熔断,无直流电压输出原因分析:保险丝熔断,无直流电压输出是微机电源最常见的一种故障,也是比较容易检修的故障。保险丝熔断可以说明两个问题:一是电路中存在着严重
Compared with the other components of the computer, the discrete components used in the power supply have a large proportion and a relatively high failure rate, which also provides maintenance personnel with a more suitable self-repair opportunity. As long as familiar with the basic composition and working principle of pulse-width modulation switching power supply, in the absence of circuit diagram, according to the physical can understand the working principle of the power supply, relatively easy to use. Now for example as follows: Example 1 fuse blown, no DC voltage output Analysis: Fuse blown, no DC voltage output is the most common computer power failure, but also easier to overhaul fault. Fuse blown can illustrate two problems: First, there is a serious circuit