电话机摘机后,听筒完全无声,工作指示灯不亮,此时用户通常都会断定是电话线路短路或断路了,而对于一些较特殊的故障,诸如电话振铃一声后即断线;电话机振铃正常,但不能拨号或通话;电话杂声大等故障,用户往往会怀疑电话机有毛病。其实这类故障大多发生在用户电话机附近的引线或线路连接头上。 After the phone is off-hook, the handset is completely silent and the work indicator is off. In this case, the user usually concludes that the phone line is short-circuited or open. For some special problems, such as the phone ringing, the phone is disconnected. Normal ringing, but can not dial or call; loud noise and other phone problems, users often suspect the phone is defective. In fact, most of these failures occur in the lead or line connector near the user’s phone.