| 故障;三无 维修与分析：通电后确认板无3.3伏电压.这板3.3伏电压是由12伏经DC转DC后输出12伏电压.检查发现整流二极管短路.更换后12正常.但无3.3伏输出.更换GH P402DC转DC后3.3伏正常。试机一天没发现问题.确认故障机修到这里，终于修好值得探讨。。 |
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