三谈自动电话机简易故障的维修陈万复１．来话铃声不响或铃声过低电话打进来，话机铃声不响，自己当然无从应答。在主叫方，刚听到回铃音，长时间无人接听。这种现象如属偶然，则多数是话局交换设备的偶发故障，不会经常发生。假如电话打出正常，但每次来话均听不到铃声时... Three talk about the maintenance of simple failure of automatic telephone sets Chen Wantun 1. Incoming ringing tone or ringing is too low Phone calls in, the phone ringing, of course, no answer. At the calling party, I just heard the ring back tone, and nobody answered for a long time. Occasionally, this phenomenon is the occasional failure of exchanges of equipment at the exchange of councils, which will not happen frequently. If the phone calls normal, but each time you can not hear the ringtones ...