故障现象 :选择适当仟伏、毫安秒准备摄影 ,按下手闸Ｉ档 ,有旋转阳极转动声 ,准备曝光 ,再按下Ⅱ档时 ,毫安表无指示 ,无Ｘ线产生。分析检修 :分析原因可能有二 :一是高压变压器初级控制电路及初次级有断路 ,使直流高压不能作用于Ｘ线管两端 ;二是Ｘ线管灯丝故障或灯丝加热电 Symptoms: Select the appropriate crouching, milliseconds ready for photography, press the hand brake I file, there is a rotating anode sound, ready for exposure, and then press the II file, the milliammeter no indication, no X-ray generation. Analysis and maintenance: analysis may be due to two reasons: First, the primary control circuit of the high-voltage transformer and the primary and secondary circuit are disconnected, so that the DC high voltage can not act on the X-ray tube at both ends; the second is the X-ray tube filament failure or filament heating