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2.2.3.2
MIC& Receiver Loop
MIC
Audio path
is shown below
：
MIC must have a bias voltage in order to operate normally
——
2.0
±
0.1V. When MIC is in good condition but loop MIC has no echo, then you need to check the basic bias
voltage signal of the MICBIASP and MICBIASSP, the language signals of the RECEIVER and MIC also
need to be checked.
MIC2 FPC
