Figure 62 Internal microphone circuitryExternal microphoneGalvanic accessories are connected to the system connector.The accessory audio mode is automatically enabled/disabled during connection/disconnection of dedicatedphone accessories.External microphone circuitry is biased by N2200 MicB2 bias voltage output. The circuitry provides asymmetrical connection for the microphone from the system connector connections, XMICN and XMICP, toN2200 inputs, Mic2P and Mic2N.Figure 63 External microphone circuitry (Pop-Port™ connects to the right side)Internal earpieceThe internal earpiece is used in the HandPortable (HP) call mode. A dynamic 8 mm earpiece capsule isconnected to N2200 differential outputs EarP and EarN.Figure 64 Internal earpiece circuitryRM-123; RM-145Nokia Customer Care System ModulePage 8 –16 COMPANY CONFIDENTIAL Issue 1Copyright © 2006 Nokia. All rights reserved.
