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1 故障现象 开机,台控选择普通摄影,按F曝光按扭PA,听到旋转阳极起动声,mA表无指示,无X线产生。经过拍打晃动控制台,机器或工作或不工作,故障反复出现,2周后,机器不工作。2 故障检修 试机透视正常。打开控制台,拆去P_1P_2排除各接线柱松动脱落现象。开机,按FPA,观察继电器工作顺序。PA第一二档,继电器SFJ工作听到旋转阳极起动声,旋转阳极电流继电器LJ,旋转阳极电压继电器YJ,旋转阳极延时继电器XSJ、辅助继电器FZJ及时间继电器和摄片继电器都不工作。复习摄影控制电路原理图可知。继电器工作顺序是SFJ→LJ→YJ→XSJ→FZJ→JSB→SC。根据分析故障可能出在旋转阳极启动及保护电路。首先检查继电器LJ线头是否脱落,用万用表测量LJ两个电源接点295、293,按下PA、电压6V,说明线包有电,电压值正常。拆下继电器LJ测量线包正常。两接触点无损坏。装上LJ、机器仍不工作。再次晃动LJ,发现LJ
1 Fault phenomenon After booting, the station control selects normal photography, presses the F exposure button PA, and hears the rotating anode start sound. The mA meter has no indication and no X-rays are generated. After slapping and shaking the console, the machine was either working or not working. The fault recurred. After 2 weeks, the machine did not work. 2 Troubleshooting The test machine is in normal perspective. Open the console and remove P_1P_2 to eliminate loosening of the terminals. Start up, press FPA, observe the relay working order. PA second gear, relay SFJ work to hear the rotating anode start sound, rotating anode current relay LJ, rotating anode voltage relay YJ, rotating anode delay relay XSJ, auxiliary relay FZJ and time relay and camera relay are not working. Review the schematic of the photo control circuit. The relay work order is SFJ→LJ→YJ→XSJ→FZJ→JSB→SC. According to the analysis of the fault may be in the rotating anode start and protection circuit. First check the relay LJ thread head is off, with a multimeter to measure the LJ two power contacts 295,293, press the PA, voltage 6V, indicating that the package has electricity, the voltage value is normal. Remove the relay LJ measuring wire package normally. The two contact points are not damaged. With LJ installed, the machine still does not work. Shake LJ again and find LJ