Internal Earpiece; Internal Speaker - Nokia N72 Service Manual

RM-180
Nokia Customer Care System Module
The accessory audio mode is automatically enabled/disabled during connection/disconnection of dedicated
phone accessories.
External microphone circuitry is biased by N2200 MicB2 bias voltage output. The circuitry provides a
symmetrical connection for the microphone from the system connector connections, XMICN and XMICP, to
N2200 inputs, Mic2P and Mic2N.
Figure 103 External microphone circuitry (Pop-Port™ connects to the right side)

Internal earpiece

The internal earpiece is used in the HandPortable (HP) call mode. A dynamic 8 mm earpiece capsule is
connected to N2200 differential outputs EarP and EarN.
Figure 104 Internal earpiece circuitry

Internal speaker

The internal speaker is used in Internal HandsFree (IHF) call mode.
A dynamic 16 mm speaker is connected to N2200 outputs HFSpP and HFSpN.
The IHF amplifier integrated in N2200 is a Digital Pulse Modulated Amplifier (DPMA).
Figure 105 Internal speaker circuitry
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