描述
机组停机大修过程中,发现#4机组PCU40柜总有一路ConTROL WAY故障,其A路ConTROL WAY的电压由4.3VDC下跌至2.6VDC,逐块拔出与ConTROL WAY直接有关联的网络处理卡INNPM01和多功能处理卡MFP03检查,发现是由PCU40 MODULE 6的MFP03故障引起,更换该卡件后正常。此类故障较隐蔽,检查卡件面板上状态显示一切正常,EWS上检查PCU40柜中的卡件也均工作正常。这要求机组在运行的情况下更换MFP03卡件时一定要慎重,最好先对卡件进行测试,测量一下MFP03在工作时ConTROL WAY的电压值是否正常,以免引起整个PCU柜故障的严重后果。I/O扩展总线故障往往是由上下机架之间的扁平连接线松动引起,导致部分I/O模件与主模件失去通讯。
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