替换法是建立在对电路原理分析的基础上，对可疑元件直接用新元件代替的一种方法。使用该方法时常会收到立竿见影的效果。用替换法修理电器，能快速排除故障或缩小故障范围。维修电器时人们经常使用万用表检查元件好坏，但有时按电路分析进行检查，又找不到故障点，陷入“... Replacement method is based on the analysis of the circuit principle, the suspicious elements directly replaced by a new element of a method. Use this method often receive immediate results. Replacement method to repair electrical appliances, can quickly troubleshoot or narrow the fault range. When repairing electrical appliances, people often use multimeters to check components for good or bad, but sometimes they are not inspected according to the circuit analysis, and they can not find the fault point.