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[例1]开机,三无”待机指示灯亮,控制全失效。分析:待机灯亮且不能起动,可能处于保护状态。检修:打开机器,检测果然处于保护状态。短接V573发射极与集电极强制起动电源,测量电源各路输出,+B117V正常,16V、25V、10V输出均正常。进而检测行输出供电电源,发现+12V—1正常,而+27V电
Analysis: Standby light is on and can not be started, it may be in the protection state. Overhaul: Turn on the machine, the detection is really in the protection state. Short circuit V573 Emitter and collector forcibly Start the power supply, measure the power of the various output, + B117V normal, 16V, 25V, 10V output are normal. And then detect the output power supply and found + 12V-1 normal, and +27 V