1、故障现象:上球管摄片时,毫安表、毫安秒表指针不动,控制台摄影继电器动作,冲洗胶片,发现胶片未感光,认定上球管摄片时无X线发生。当把控制台交换挡拨到下球管透视时,有荧光发生,毫安表指针指示正常。 2、故障分析:下球管透视、点片工作正常,上球管摄影时无X线,这表明上球管摄影高压部分故障。当切断高压初级P_1、P_2,通电交换大、小 1, Symptom: On the tube shot, milliampere table, mA stopwatch pointer does not move, the console camera relay action, film processing and found that the film is not sensitive, that no radiography on the tube X-ray occurred. Fluctuations occur when the console is swapped to the lower ball tube for fluoroscopy, and the milliamp meter pointer indicates normal. 2, failure analysis: under the perspective of the ball tube, the film is working properly, no X-ray on the tube photography, which shows that part of the high pressure on the tube photography failure. When cut off the high-pressure primary P_1, P_2, the exchange of electricity is big and small