故障现象F99-I型X光机为双床双管X线机。进行普通的摄影时,kV,mA表突然无指示,冲片显示没曝光。故障排查将X线机切换至透视床观察kV,mA表,都能够随档位调节而变化,X线管大小焦点均亮,这说明高压变压器本身和灯丝变压器都正常。拆下高压初级V1,V2检测普通摄影高压,初级电压为0V, Symptom The F99-I X-ray machine is a twin-bed dual-tube X-ray machine. When performing ordinary photography, the kV, mA meter suddenly shows no indication and the punch shows no exposure. Troubleshooting: Switching the X-ray machine to the see-through bed to observe the kV and mA meter can all be changed with the gear adjustment. The X-ray tube has the same focus, which means that the high-voltage transformer itself and the filament transformer are normal. Remove the high-voltage primary V1, V2 test ordinary shooting high voltage, the primary voltage is 0V,