2.7 电阻器常见故障判断与维修
本章图片暂略
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2.7.1 阻值改变故障判断及维修
阻值改变故障比较常见,由于温度、电压、电路的变化超过限值,使电阻阻值变大或变小,用万用表检测时可发现,实际阻值与标称阻值相差很大,而一般都是阻值变大,如图2-28所示。阻值变化的这类故障,只能换新的电阻器才能消除。
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2.7.2 断路故障判断及维修
所谓断路就是电阻无限大,电路不通。断路故障有的可目测出来,如引线折断、脱落、松动及断裂等,如图2-29所示。有的则必须用万用表测量。测量时,发生断路故障的电阻指针会指示无穷大。
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2.7.3 内部接触不良故障判断及维修
如果家用电子电器有杂音、噪声或者有间断的响声,这类故障多数是由电阻器内部接触不良造成的,有时电阻工作时还会带有微小的跳火现象。
电阻器常因碳膜损坏而接触不良,如图2-30所示,如在收音机电路里会使收音机发声音轻、时响时停、杂音大及无音等;在电视机电路里会使电视机无光、无图像、和无声等。
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