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XJJ—Ⅱ型心脏急救仪系上海医用电子仪器厂产品,应用比较普遍,现将四例故障现象的检修过程整理如下,供参考。故障一:开机后 ECG 只有短暂的显示,而后显示描记全无,调节各个旋钮不起作用。检修过程:先测 DC 各组电源,±18V、±5V电压均正常,有显示时±12V 电压也正常,无显示时±12V 电压等于零,说明 DC—DC 变换稳压电源工作基本正常。故障可能出在±12V 稳压电路和±12V供电电路,查稳压电路正常。根据故障现象分析,引起这种故障以电容和继电器的可能性较大。由于±12
XJJ-Ⅱ-type cardiac emergency instrument Department of Shanghai Medical Electronic Instrument Factory products, the application is more common, the troubleshooting of the four cases are now organized as follows for reference. Fault 1: ECG boot only after a brief display, and then display the tracing all without adjusting the various knobs do not work. Maintenance process: first test DC power supply, ± 18V, ± 5V voltage are normal, when ± 12V voltage is normal, ± 12V voltage is not displayed when the display is zero, indicating DC-DC conversion power supply work is normal. Fault may be ± 12V regulator circuit and ± 12V power supply circuit, check the voltage regulator circuit is normal. According to the analysis of the failure phenomenon, the possibility of causing such a fault with a capacitor and a relay is greater. Because ± 12