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例1 故障现象:开机“三无”,待机指示灯闪烁。分析与检修:根据现象判断,故障发生在开关电源电路。该机开关电源电路由开关控制集成块(TDA4601)、开关管(2SD1959)等元器件组成(如图1所示)。
Example 1 Symptom: boot “three no”, the standby light flashes. Analysis and Maintenance: According to the phenomenon of judgment, the fault occurred in the switching power supply circuit. The machine switching power supply circuit by the switch control manifold (TDA4601), switch (2SD1959) and other components (as shown in Figure 1).