一、KB 400型 x 线机故障一例1.故障现象:床下管在透视过程中,荧光屏的亮度时亮时暗,mA 表指数不稳。2.故障检查:(1)检查床下管灯丝点燃情况,灯丝大小焦点均正常点亮,灯丝加热电阻受调,说明灯丝加热电路无接触不良现象。(2)将技术选择开关放于胃肠点片档,进行床下管摄影试验,电路一切正常。(3)在高压初级 P_1P_2两端并联一只电压表,在透视情况下, First, the KB 400 x-ray machine failure example 1. Symptom: Under the bed tube in the fluoroscopy process, the screen brightness when dark, mA table index instability. 2. Troubleshooting: (1) Check the bed under the filament lighting conditions, the size of the filament are normal lit, the heating resistance of the filament is adjusted, indicating the filament heating circuit without contact with the poor. (2) The technology selection switch placed in the gastrointestinal spot file, under the bed tube photography test, the circuit is all normal. (3) parallel in the high-voltage primary P_1P_2 both ends of a voltmeter, perspective case,