Mic ETS2228 Instrukcja Użytkownika Pobierz pdf (Strona 9)

ETS2228 Maintenance Manual

Figure 4 Handset MIC Circuit

2）Handle Receiver Interface. Bead and capacitor constitutes the filter circuit.

Figure 5 Handle Receiver Interface

3）Hands-free Interface Circuit

The audio amplifier amplifies EAR2 signal to speaker, the switch of speaker is controlled by the bias

voltage of MIC2_P. And when the bias voltage of MIC2_P is zero, the voice channel and the audio

amplification is shut-down, which the system is in idle status. Possible faults of the hands-free channel:

no ringing, then check whether U603 is wrong or not.

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Mic ETS2228 Instrukcja Użytkownika Strona 9