External Microphone; Internal Earpiece - Nokia 6233 Service Manual

RM-123; RM-145
Nokia Customer Care System Module
Figure 62 Internal microphone circuitry

External microphone

Galvanic accessories are connected to the system connector.
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 63 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 64 Internal earpiece circuitry
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