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德国ELEK TR_0T_0M2000腹腔镜电刀,因体积小、能量控制精确、性能稳定、安全,而被国内多家医院用于肝胆外科腹腔镜下手术。 故障现象:输出时有时无,未输出时面板控制灯暗。 分析排除:由于没有任何维修资料,并且故障不是一直出现,所以根据故障现象,我们检查了插头接触情况,元件的焊接情况等直观地检测手段,无异常发现,当故障出现时,面板控制很暗,问题出在低电压电源部分,测试低电压板,发现±5V输出分别降到1.45～2.2V。分析其原理,±5V电压由变压器输出9V交流,经全波整流输出12.7V直流,再经过L7805三端稳压后输出+5V。而-5V也由同一变压器输出交流9V经半波整流后输出6.4V直流经
German ELEK TR_0T_0M2000 laparoscopic electric knife, because of its small size, precise energy control, stable performance, and safety, has been used by many hospitals in China for laparoscopic surgery of hepatobiliary surgery. Fault phenomenon: Sometimes there is no output, and the panel control lamp is dark when not output. Analysis and Exclusion: Because there is no maintenance information, and the fault does not always appear, according to the phenomenon of failure, we check the plug contact conditions, component welding conditions and other intuitive detection means, no abnormalities found, when the fault occurs, the panel control is very dark The problem lies in the low-voltage power supply. Test the low-voltage board and find that the ±5V output drops to 1.45-2.2V, respectively. Analyze its principle, ± 5V voltage exports 9V exchanges from the transformer, after full-wave rectifier output 12.7V direct current, after L7805 three-terminal regulator output +5V. The -5V is also the same transformer output AC 9V half-wave rectified output 6.4V DC after