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例一、故障现象:某分机收铃时烧保险。 故障分析及处理:首先用正常的“电源盘”代换有故障分机的“电源盘”,其故障消除,确定出坏盘。此故障系“电源盘”中铃流发生器的问题,参见图1。 电络原理:端机送来的2100Hz信号,使“接口盘”中J4继电器吸动,15、16接点吸合,“地”启动“电源盘”中铃流发生器,使其振荡。收铃时烧保险说明“电源盘”中有短路故障。检查中发现BG5已击穿,换过三极管,两个小时后,BG5又烧坏了。是
For example, failure phenomenon: an extension when the bell burning insurance. Failure Analysis and Processing: First of all with the normal “power disk” replaced by a fault extension of the “power disk”, the failure to eliminate, determine the bad disk. This problem is a problem with the ring current generator in the “Power Board”, see Figure 1. The principle of the circuit: The end machine sent 2100Hz signal, so that the “interface plate” in the J4 relay suction, 15,16 contact pull, “ground” to start the “power disk” in the ring current generator, so that oscillation. Burn when the bell insurance instructions “power disk” in the short circuit fault. Check found BG5 breakdown, replaced the transistor, two hours later, BG5 has burnt out. Yes