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故障现象：接通电源描笔即出现抖动。分析与检修：心电信号由缓冲放大器IC100～IC102和威尔逊网络及双四选～模拟开关IC103～IC108组成输入电路。导联选择由ADV、REV键控制。被选通的导联信号进入前置放大器IC107，经高频滤波后送入同相放大器IC108推动光电耦合器，将心电信号
Symptom: Jitter occurs when power is turned on. Analysis and maintenance: ECG signal from the buffer amplifier IC100 ~ IC102 and Wilson network and dual four-to-analog switch IC103 ~ IC108 form the input circuit. The lead selection is controlled by the ADV, REV keys. The gate signal of the gated signal enters the preamplifier IC107. After high frequency filtering, it is sent to the non-inverting amplifier IC108 to push the optocoupler and the ECG signal