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ECG—6511在国内有较大的市场,一些县级医院及乡卫生院都使用此机做为心电图检查的常规仪器。本文着重介绍了ECG—6511走纸故障的检修,此类故障占送维修站修理机器的50%。由晶阵器×201产生32kHz的晶阵脉冲,通过Q204放大整形后送到计数器IC209第10脚进行分频,而Q6、Q7输出端分别输出512Hz和256Hz的方波脉冲信号。由走速开关控制并通过转换控制门IC205把信号送到个位比较器IC210的输入端,由13脚输出的脉冲信号经L、P、F电路并由开关三级管Q203控制直接送到驱动放大电路Q201、Q202,Q201输出的电乎控制马达的运转。马达走动的快慢,由反馈线路通过检速线圈,再由门电路IC211把反馈信号送到比较器,由此不难分析出回路通过比较器控制马达的转速。
ECG-6511 has a large market in China. Some county-level hospitals and township hospitals use this machine as a routine instrument for ECG examination. This article focuses on the maintenance of ECG-6511 paper-feeding faults, which account for 50% of repair machines in repair stations. A 32 kHz array pulse is generated by the crystal array device 201, and is sent to the 10th pin of the counter IC209 to be frequency-divided by the Q204 amplification and shaping, and the Q6 and Q7 output terminals output square wave pulse signals of 512 Hz and 256 Hz, respectively. The signal is sent to the input of the bit comparator IC210 by the gate switch and controlled by the switching control IC205. The pulse signal output by the 13 pin is sent to the driver directly via the L, P and F circuits and controlled by the switching transistor Q203. The amplifier circuits Q201, Q202, and Q201 output electric power to control the operation of the motor. The speed of the motor moves, the feedback line passes through the speed check coil, and the feedback signal is sent to the comparator by the gate circuit IC211, so that it is not difficult to analyze the speed of the loop controlling the motor through the comparator.