电话机作为一个终端设备,与程控交换机、电话线路共同构成了电话通信系统。上述三个部分任何一个工作失常,均将导致通话中断。所以,在用户电话出现故障后,应首先确定是哪里出了故障,如果是外线和交换机的故障,应通知故障台查修线路;如果是自身电话机的故障,则应将电话机送到维修部门检修或更换。 一、由交换机和外线引起的故障现象 Telephone as a terminal device, and program-controlled switches, telephone lines together constitute a telephone communication system. Any of the above three parts of the work, will lead to interruption of the call. Therefore, after the user’s telephone breaks down, should first determine where is out of trouble, if it is the outside line and the switchboard trouble, should inquire the trouble line to check the line; If is own telephone’s breakdown, then should send the telephone to the maintenance Department repair or replacement. First, caused by the switch and outside the phenomenon of failure