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故()现象 交流供电时，合上心电图开关(sw301)，START/STOP指示灯一闪即灭，表笔动作不足一秒，显示全无。
Therefore, when the AC power supply is switched on, the electrocardiograph switch (sw301) is closed, and the START/STOP indicator blinks and disappears, and the test pen action is less than one second.