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例1 故障现象:在收看中突然停机,电源指示与待机指示都亮,按遥控器上的待机键也不能开机。分析与检修:开机,按动遥控器上的待机键,可听到继电器的吸合声,但随即又听到释放声,在这种情况下结合待机指示灯点亮,判断可能是保护电路动作,并且故障出在二次回路保护电路或一次回路保护电路的倍压整流保护电路。为确定是哪一部分电路引起,分别常规检查电源各支路保护电路及继电器控制电路,
Example 1 Symptom: Suddenly stopped in the watch, power indicator and standby instructions are bright, press the standby button on the remote control can not boot. Analysis and maintenance: boot, press the standby button on the remote control, you can hear the sound of the relay pull, but then hear the release of sound, in this case combined with the standby indicator light to determine the protection circuit may be action , And the fault out of the secondary circuit protection circuit or a circuit protection circuit voltage doubler rectifier protection circuit. To determine which part of the circuit is caused, respectively, routinely check the power supply of each branch protection circuit and relay control circuit,