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故障一:合上电源开关QF,电源指示灯HL不亮 (1)合上照明开关SA2,如果照明灯EL亮,表明控制( )之前的电路没有问题。可检查( )是否熔断;控制变压器( )及输出电压是否正常;指示灯灯泡是否( );灯泡与灯座之间( )是否良好。 (2)合上照明开关SA2,如果照明灯EL不亮,则故障很可能在TC之前。首先应检查( )是否熔断,如果没有问题,可用万用表交流( )挡测量( )前后的电压是否正常,以确定故障是电源无电压,还是开关接触不良或损坏。
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