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笔者开机检查CL_(42)电路(透视亮度自动控制电路),按下透视自动档,接通高压,移动被检体。或扩大和缩小照射野时,CL_(42)的KV调节电机不工作,亮度不能自动跟踪。经对透视光电管PM高压供给电路203板的18和24输出端测量,发现无高压(750V)输出,故对203板上的变压器Trl输入端测量无220V输入电压,检查保险丝sil(200mA)烧断,换上新品后,该电路工作正常,透视亮度自动控制正常;但经过透视几分钟后又出现故障,透视亮度不跟踪,而且控制台面上的mA_1、mA_2、mA_3任一档按下,指示灯均不亮,
The author checks the CL_ (42) circuit (perspective brightness automatic control circuit), press the perspective of the automatic file, connected to high pressure, moving the object. Or enlarge and reduce the irradiation field, CL_ (42) KV adjustment motor does not work, the brightness can not be automatically tracked. The voltage of 220V is not measured at the input of the transformer Tr1 on the 203 board. The fuse sil (200mA) is checked for burnout Off, put on new products, the circuit is working properly, perspective brightness automatic control of normal; but after a few minutes after the perspective of failure, perspective brightness is not tracking, and the control panel mA_1, mA_2, mA_3 any file press, indicating Lights are not bright,