External Microphone; Internal Earpiece - Nokia 6680 RM-36 Service Manual

RM-36
Nokia Customer Care System Module

External microphone

TM
Galvanic accessories are connected to the system connector (Pop-Port ).
Accessory audio mode is automatically enabled/disabled during connection/disconnection of dedicated phone
accessories.
External microphone circuitry is biased by Retu ASIC MicB2 bias voltage output. The circuitry provides a
TM
symmetrical connection for the microphone from the Pop-Port connections, XMICN and XMICP, to Retu ASIC
inputs, Mic2P and Mic2N.
Figure 116 External microphone circuitry (Pop-Port connects to the right side)

Internal earpiece

Internal earpiece is used for the HandPortable (HP) call mode. A dynamic 8mm earpiece capsule is connected
to Retu ASIC's differential output EarP and EarN.
Figure 117 Internal earpiece circuitry
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