故障现像：透视正常．床上球管摄片当按下曝光按钮时，控制台面毫安表指针时而正常指示，时而不指示，时而正常红灯信号闪亮，时而异常黄灯信号闪亮，造成照片不曝光。检修分析：打开控制目后盖板，取下高压初级PIP。。折掉这光器，从窗口观察阴极大小焦点灯丝不点亮，用万用表 Fault phenomenon: perspective normal. When you press the exposure button on the bed tube camera, the console surface milliampere meter hands normally indicate, sometimes do not indicate, sometimes the normal red light signal flashes, and sometimes the abnormal yellow light signal flashes, causing the photo to not be exposed. Maintenance analysis: Open the control panel and remove the high pressure primary PIP. . Fold off the light, observe the cathode size from the window, the focus filament does not light, use a multimeter