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故障现象：开机时听不到高压发生器磁控开关闭合的响声，计算机自检后提示：“ＳＣＡ—ＮＥＲＮＯＰＯＷＥＲ”。分析与维修：打开高压发生器前盖板，位于右上角的“ＬＡＮＥ”指示灯不亮，说明电源没有向设备供电。打开后盖板，测三相电源供电控制开关ＮＦＢ２输入端电压正常
Symptom: When the power is turned on, the sound of the magnetic switch of the high-voltage generator is not heard. After the computer self-checks, it prompts: “SCA-NERNOPOWER”. Analysis and maintenance: Turn on the high voltage generator front cover. The “LANE” indicator in the upper right corner does not light, indicating that the power supply is not supplying power to the device. Open the rear cover and measure the voltage of the three-phase power supply control switch NFB2 input terminal