6.试分析JT-C机车信号“上电后不点灯”的原因。
["\u7b54\uff1a\u4e0a\u7535\u540e\u4e0d\u70b9\u706f\u539f\u56e0\u4e3b\u8981\u6709\uff1a\uff081\uff09\u4e3b\u673a\u5185\u7535\u6e90\u6545\u969c\uff1b\uff082\uff09\u663e\u793a\u5668\u6545\u969c\uff1b\uff083\uff09\u4e3b\u673a\u6545\u969c\uff1b\uff084\uff09\u7535\u7f06\u6216\u7535\u7f06\u63d2\u5934\u6545\u969c\uff1b\uff085\uff09\u70b9\u706f\u7ebf\u4e0a\u8d1f\u8f7d\u8fc7\u5927"]