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例一故障现象:飞跃HA—23型电话机不振铃。分析与检修:时将振铃通路降压电阻1R_2短路后试机,振铃正常,查得该电阻已开路,换一只1kΩ电阻,话机正常。例二故障现象:佳信HA238(Ⅲ)P/TDL电话机首位拨“6”时,虽有报键音,但不被交换机确认,拨完该位后仍有拨号音,“6”发不出去,而首位拨其他号码或者“6”不在首位时,拨号仍正常。分析与检修:根据故障现象判断,此故障是由于拨
Example A failure phenomenon: leap HA-23 phone does not ring. Analysis and Maintenance: When the ringing circuit buck 1R2 short circuit test machine, the ring is normal, check the resistance has been open, for a 1kΩ resistance, the phone is normal. Example II Failure phenomenon: Although Jiayin HA238 (Ⅲ) P / TDL telephone dials “6” first, it will not be confirmed by the switch though the key tone is reported. After dialing this bit, there is still a dial tone, “6” Out, and the first dial other numbers or “6” is not in the first place, dial-up is still normal. Analysis and Maintenance: According to the phenomenon of failure to determine, this fault is due to dial