| 故障表现为：上不了网 故障分析：通电试机连接网线，显示网线断开。测量网口处电阻R810-R813发现全部烧毁。测量U002处对地阻值，发现已经对地短路。怀疑U400短路所致，于是代换U400跟R811-R813试机故障机修到这里，终于修好值得探讨。。(发现多列) |
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