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1 6 15 1心电图机被摔后发生描笔单偏 ,调节移位电位器失效。分析检修 :描笔单偏一般由主放大电路引起 ,包括± 8Ｖ电压、ＢＴＬ功放、位置反馈电路。先查± 8Ｖ电压 ,正常 ,再查位置反馈电路 ,测ＩＣ114③脚 ,信号为 0Ｖ ,说明无反馈信号 ,查位置反馈传感器 ,发现其与电路板
1 6 15 1 After the ECG machine was struck, a single stroke was detected and the adjustment potentiometer failed. Analyze and repair: The pen bias is generally caused by the main amplifier circuit, including ±8V voltage, BTL power amplifier, and position feedback circuit. First check the ± 8V voltage, normal, and then check the position feedback circuit, test IC1143 pin, the signal is 0V, indicating no feedback signal, check the position feedback sensor, and find the circuit board