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Figure1-8 Handle microphone interface
Figure 1-9 shows the circuit of the handle receiver interface. Bead and capacitor
constitute the L-type filter circuit.
Figure1-9 Handle receiver interface
Possible fault of the handle channel: If the handle has problems in sending and
receiving signals, check whether or not the circuit is broken at L103, L101, L105,
and L106
The hands-free interface circuit is shown in Figure 1-10. The microphone interface
MIC2_P directly connects the microphone. The EAR2 signal amplifies the drive
speaker via the audio power amplification. The switch of the speaker is controlled
by the bias voltage of MIC2_P. When the voice channel is closed, the bias voltage
of MIC2 is 0, and the audio amplification function is closed to enter the power
sparing status.
9
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