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故障现象 该机在免提状态下，收听不到用户的声音，但使用子机和手柄能接收到用户的声音；子机呼叫主机时，主机扬声器中有子机呼叫的振铃声。按免提键后，子机接收主机的声音正常，主机扬声器中没有子机呼叫声音传出，而用手柄同子机对讲通话正常。分析检修 根据故障现象，判
Symptom This machine can not hear the user’s voice in hands-free mode, but can receive the user’s voice when using the slave and the handle. When the slave calls the master, there is a ring tone of the slave calling in the host speaker. Press the speakerphone, the sub-machine to receive the host’s voice is normal, the host speaker no sub-machine calls the sound came out, and with the sub-machine intercom with the handle normal. Analysis and maintenance according to the fault phenomenon, sentenced