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故障现象：开机后面板上各指示灯初始显示正常，在作心电图时导联选择键不工作，其它功能健正常。分析检修：测IC2129脚。开机后9脚出现一个瞬间十8伏高电平，证明初始化电路正常，加减计数器ICZ12和译码器IC213起了一定作用。按下SW201，测IC205AI脚有十8伏高电平，3脚输出一?
Symptoms: The indicators on the back panel of the boot are initially displayed normally. When the electrocardiogram is used, the lead selection keys do not work, and other functions are healthy. Analysis and maintenance: test IC2129 feet. After turning on the 9-pin, there is a transient high of 8 volts, which proves that the initialization circuit is normal, and the ICZ12 of the up-down counter and the IC213 of the decoder play a certain role. Press SW201, test IC205AI feet have a high level of 8 volts, 3 feet output a?