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故障现象：机器无法定标，所记录的心电信号图波幅很微弱。分析检修：观察面板液晶显示器，显示正常，开机壳测试直流电压值无异常，可以排除电源故障所致。只能怀疑控制电路和主放大电路，而且从显示器显示正常来看，主电路故障可能性最大。从电路原理图可以看出，致使无法定
Symptoms: The machine cannot calibrate, and the recorded ECG signal amplitude is very weak. Analysis and maintenance: observation panel LCD display, normal display, the boot shell test DC voltage value is not abnormal, you can rule out the power supply failure. Can only doubt the control circuit and the main amplifier circuit, and from the monitor display is normal, the main circuit fault is most likely. It can be seen from the circuit schematic that it is impossible to determine