一、概述四川通达电器有限公司生产的通达牌系列卫星接收机,社会拥有量大,这些接收机绝大部分都安装在自然条件较差的山区农村。因此,因受电网电压波动大的影响和雷电引发的危害,电源损坏率相对较高,且该接收机开关电源中选用了广大业余电子爱好者和初学者不熟悉和稳压器件一TL431.由于对TL431的结构、工作原理不了解.一些修理者甚至误认为TL431是可控硅、三极管、稳压管,并用它进行替换,结果引起电源输出电压升高.造成滤波电容爆裂、主板上的 I. Overview Sichuan Mastery Electric Co., Ltd. Mastery licensing series of satellite receivers, the community has a large quantity, the vast majority of these receivers are installed in poor mountainous areas of rural areas. Therefore, due to the impact of large power grid voltage fluctuations and lightning damage, the power damage rate is relatively high, and the receiver switching power supply used in the majority of amateur electronic enthusiasts and beginners are not familiar with and regulator device a TL431. TL431 on the structure, working principle do not understand.Some repairers even mistaken TL431 is thyristor, transistor, regulator, and use it to replace the resulting power supply output voltage caused by the filter capacitor burst, the motherboard