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本文作者根据本人值机中发现C4卫星接收机LNB18V供电电源，经常出现对地严重短路，且完好无损，按一下电源按钮即可恢复正常的现象。引起对C4机（LNB）18V供电电源进行分析。本文报道找到了保护电路，提出了自己的看法，供同行们磋商参考。
According to my own check-in C4 satellite receiver LNB18V power supply, the author often appears on the ground a serious short circuit, and intact, click the power button to resume normal phenomenon. Cause C4 (LNB) 18V power supply for analysis. This article reports found the protection circuit, put forward their own views for their colleagues to consult for reference.