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1故障现象机器二维图像正常一连续多普勒和脉冲多普勒波形不能连续，并时有时无一用本机自检测试程序进行自检，显示数据正常。2故障分析与检修由于机器自检数据正常．连续多普勒和脉冲多普勒电路部分正常，根据现象分析，故障原因：（）连续多普勒控制键接触不良。（引连续多
1 Symptom The normal two-dimensional image of the machine, a continuous Doppler and pulsed Doppler waveform cannot be continuous, and sometimes there is no self-test with the local self-test program, and the display data is normal. 2 failure analysis and maintenance due to normal machine inspection data. The continuous Doppler and pulse Doppler circuits are partially normal. According to the phenomenon analysis, the cause of the failure is: () The continuous Doppler control key is in poor contact. (Continuously cited