故障现象 :屏幕上有呼吸曲线显示 ,但无呼吸数据显示。故障维修 :对机器的其他各项功能进行检测 ,均无异常 ,说明机器的整个控制功能正常 ,问题应出现在呼吸监测部分。而有呼吸的曲线显示 ,说明呼吸检测、放大电路应正常 ,问题应出在数显电路部分。首先对数显电路进行检查 ,结 Symptom: The screen displays a respiration curve, but no respiration data is displayed. Fault Maintenance: The other functions of the machine to detect, no abnormalities, indicating that the entire control function of the machine is normal, the problem should appear in the respiratory monitoring section. The respiratory curve shows that respiratory testing, amplification circuit should be normal, the problem should be digital circuit part. First of digital circuits for inspection, knot