我国很多地区的医院购置安装了北京射线机的F99Ⅲ－AT型三球管500mAX光机，该机质量总的来说不错。我院73年购置安装使用，性能稳定，未见重大的故障。但小行病仍时有发生。如床面长降限位微动开关失灵，床身木能动作。床面限位机构皮打滑，使床面左右运动比例失调。自动这度控 Hospital in many parts of our country to buy and install Beijing ray machine F99Ⅲ-AT type three ball 500mAX machine, the quality of the aircraft in general good. Our hospital 73 years to purchase and install the use of stable performance, no major failure. However, parotitis still occur from time to time. Such as bed down limit microswitch failure, the bed can move wood. Bed limit mechanism skidding, so that the proportion of bed movement disorders. Automatically this degree of control