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1.我院引进的英国S360扫描电镜去年发生故障,其现象为:仪器其它工作一切正常只是最终在图像记录时,照相机成像失败。经查在成像操作时示波管无扫描线。打开仪器的示波管部分,检测不到+400V,-132V中压,而这些电压又来自记录显示电源电路。仔细检测发现记录显示电源板上开关电源TR2,TR3(均为VN0206N5)D,S极短路,用IRF830代替后仪器恢复正常。
1. The introduction of our hospital in the United Kingdom S360 SEM last failure occurred, the phenomenon is: everything else works properly, but the final image recording, the camera fails to imaging. The investigation did not scan line oscilloscope imaging operation. Open the oscilloscope tube part of the instrument, can not detect + 400V, -132V medium voltage, and these voltages are from the record shows the power circuit. Careful testing found that the power supply board switching power supply TR2, TR3 (both VN0206N5) D, S very short circuit, replaced with IRF830 instrument back to normal.