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例1.免提送话无声故障现象:免提送话无声,其他功能正常。分析检修:根据故障现象分析,可能送话电路系统有故障,分析该机原理电路,在免提送话状态,当对着驻极体送话器BM2讲话时,BM2把声音信号转变成电信号,此电信号通过耦合电容C35送入集成电路IC2的⑨脚,经内部放大后从⑩脚输出,输出的信号经R45、C37耦合到IC2③脚。此时由于发送信号强,使其
Example 1. Hands-free speech when silent Symptom: hands-free speech is silent, the other functions are normal. Analysis and maintenance: According to the analysis of the fault phenomenon, the transmission circuit may be faulty. Analysis of the principle circuit of the machine is in the state of hands-free transmission. When speaking to the electret microphone BM2, the BM2 converts the sound signal into an electrical signal , The electrical signal through the coupling capacitor C35 integrated IC2 IC into the feet, the internal amplification from the ⑩ foot output, the output signal through R45, C37 coupled to IC2 ③ feet. At this time because of the strong signal sent to it