Description
如接线端或导线接触不良，接线端与实际信号不一致，输入信号线接反、松动、脱落，模块与底座接插不良等。人为的错误如将拨码开关位置放错，通信线接线方向错误或终端匹配器未接等。以上问题只要加强日常维修检查，加强人的责任心是可以杜绝、发现、消除的。
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