Internal Earpiece - Nokia n81 Service Manual

RM-179; RM-223
System Module and User Interface
Accessory audio mode is automatically enabled/disabled during connection/disconnection of dedicated
phone accessories.
External mic uses AVILMA (N2200) Mic2P and Mic2N inputs. External mic circuitry is biased by AVILMAs MicB2
bias voltage output. This bias voltage is filtered by R2207 and C2202 and the fed through R2200.
Figure 74 MicBias circuitry
Figure 75 External mic circuitry

Internal earpiece

Internal earpiece is used for Handportable (HP) call mode. A dynamic earpiece is connected to AVILMA via
slide FPC 1YZ in slider.
Issue 1 COMPANY CONFIDENTIAL Page 6 –35
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