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故障现象：开机电源指示灯亮，ＣＲＴ上全是无法分辨的代码。所有探头不能输入信号。故障分析：探头不能输入信号有两个原因：１．探头坏；２．多普勒前端的发射／接收或多普勒控制部分不工作。由于两个探头同时不能输入信号，两个探头同时损坏的可能性不大，从而先考虑第二个
Symptom: The power indicator light is on, and the code on the CRT is indistinguishable. All probes cannot input signals. Failure Analysis: The probe can not input signal for two reasons: 1. The probe is bad; 2. The Doppler front-end transmit/receive or Doppler control part does not work. Since the two probes cannot input signals at the same time, it is unlikely that the two probes are damaged at the same time, so that the second one is considered first.