故障现象：将点片架拉人荧光屏侧，准备做点片摄影，按曝光钮后，监示屏上无影像显示。再做照像和点片曝光试验，毫安表指针不上或猛摆冲顶，电压表指示下降60V，RD保险馆断，RZ电阻烧裂。故障分析及维修：毫安表指针冲顶现象在电缆短路，高压发生器内短路，球管内油耐压降低， Symptoms: Pull the plate holder to the side of the fluorescent screen, ready to do spot photography, press the exposure button, there is no image display on the monitor screen. Doing photo and spot exposure tests again, the milliammeter pointer was not on the tip of the pendulum or the dome was oscillating, the voltmeter indicated a drop of 60V, the RD insurance hall was broken, and the RZ resistor was cracked. Failure analysis and maintenance: Millimeter pointer flashing phenomenon in the cable short-circuit, short-circuit high-voltage generator, the pressure drop within the bulb,