RD-9-102型肺功能分析仪是日本生产的,由于年代已久,现大部分医院已淘汰,但最主要的是检修方面存在着许多不便,尤其是零配件的购置和无电原理图。不过,我院的此台仪器由于我们及时想方设法更改和维修保养。使之一直保持最佳状态。现将He气部分数字不能调零的故障检修介绍如下。根据故障现象,我们先检测He气通道部分的运算放大器741模块,电源电压正 RD-9-102-type pulmonary function analyzer is produced in Japan, as a long time, most hospitals have been eliminated, but the most important is the maintenance there are many inconveniences, especially the purchase of spare parts and electroless schematic . However, this instrument in our hospital is in a timely fashion as we try to change and maintain it. Keep it always in the best condition. Now He gas part number can not be zero troubleshooting introduced below. According to the fault phenomenon, we first test the He gas channel part of the op amp 741 module, the supply voltage is positive