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Receiver loop is simple. The output of BB drive Receiver directly through Filter and ESD protected
network, as shown below:
2.2.3.3
Headset Loop
Headset loop includes two signals: Headset speaker and MIC
，
I
f the headset fitting were
in good condition,
when the headset plug in, it appears abnormal, such as: The Headset speaker has no sound, the MIC is
invalid. All this need to check the access conditions of the circuit above.
