故障现象：开始透视时荧光暗淡，摄影时影像清晰度和对比度降低，mA指示始终很小。后来变成透视和摄影均不曝光。分析与检修：进入机房，发现机房特别潮湿且通风差，机器受潮严重。经处理后根据先低压后高压的检修原则，打开控制台后盖板，将控制台底部高压输入接线拆下，接上? Symptoms: Dim fluorescence at the beginning of fluoroscopy, image sharpness and contrast reduction when shooting, mA indication is always small. Later turned into perspective and photography are not exposed. Analysis and Maintenance: Into the engine room, the machine room was found to be particularly humid and poorly ventilated, and the machine was seriously affected by moisture. After processing, according to the maintenance principle of low pressure and high pressure, open the console rear cover, remove the high voltage input wiring at the bottom of the console, and connect it.