故障现象:用立柱Ｘ线管摄片时,曝光正常。而用诊视床Ｘ线管透视时,ｍＡ表指示冲顶,透视高压保险丝熔断。故障诊断:根据现象,初步考虑除高压发生器外的透视高压电路有故障。从Ｘ线管头端拔下高压电缆插头,仔细观察插头与其所对应的插座,没有发现击穿爬电痕迹。将两插头架在空中, Symptoms: The exposure is normal when using the X-ray tube. When the X-ray tube is used for the observation of the bed, the mA meter indicates the top of the eye, and the high-voltage fuse blows through. Fault diagnosis: According to the phenomenon, it is initially considered that there is a failure of the see-through high voltage circuit except the high voltage generator. Unplug the high-voltage cable plug from the X-ray tube head and carefully observe the plug and its corresponding socket. No traces of puncture creepage were found. Put the two plugs in the air,