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故障现象1:接通电源开关后,没有任何显示和反映。 分析检修:据故障现象分析,故障可能出在电源电路。先用万用表在电源插头处测量机内电源输入电路的电阻,测量结果为零,这表明机内有开路故障。然后,打开机壳,直观检查发现保险丝F701已经熔断,玻璃管发黑,表明整流桥或开关电源电路存在短路故障。用万用表测整流桥电路交流输入端电阻,未
Symptom 1: Turn on the power switch, there is no display and reflection. Analysis and Maintenance: According to the failure analysis, the failure may be in the power circuit. First use the multimeter to measure the resistance of the power input circuit in the power plug at the power plug, and the measurement result is zero, which indicates that there is an open circuit fault in the machine. Then, open the case, visual inspection found fuse F701 has blown, the glass tube is black, indicating the rectifier bridge or switching power supply circuit short-circuit fault. Use a multimeter to measure the AC input resistance of the bridge circuit