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笔者在对ECG6511心电图机故障检修工作中，发现走纸部分故障较多，现将其电路原理分析如下，并介绍一典型故障的维修。电路原理：ECG6511心电图机的走纸速度控制电路是由一个速度选择电路、一路反馈电路及驱动电路组成。由晶振X201产生32．768kHz的时钟频率，经IC209计数器产生
The author in the ECG6511 electrocardiograph troubleshooting work, found that more paper-feeding part of the fault, now its circuit principle is analyzed as follows, and introduces a typical fault repair. Circuit Principle: The ECG6511 electrocardiograph’s paper feed speed control circuit consists of a speed selection circuit, a feedback circuit, and a drive circuit. Generated by the crystal X201 32.768kHz clock frequency, generated by the IC209 counter