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故障 1 选叫分机时不响铃 ,自试响铃。自试响铃 ,说明数码检波或信号接收放大电路可能有故障。更换包含数码检波的信号盘后 ,分机使用没有变化 ,确认故障出在信号接收放大电路中。信号接收放大电路由集成运放 ( 8FC7)组成 2级放大电路。根据运放特性 ,其同相、反相输入端的工?
Fault 1 call extension does not ring, self-test ring. Self test ring, indicating digital detection or signal receiving amplifier circuit may be faulty. After replacing the signal plate containing the digital detector, the extension is used without change, and the fault is confirmed in the signal receiving amplifier circuit. Signal receiving amplifier circuit by the integrated op amp (8FC7) composed of two amplifier. According to operational characteristics, the same phase, inverting input of the work?