External Earpiece - Nokia RM-42 Service Manual

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System Module

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Speaker is assembled to camera unit, but some filter components are also in engine PWB.

Figure 115 Internal speaker circuitry

External earpiece

Galvanic accessories are connected to the system connector (Pop-Port

Accessory audio mode is automatically enabled/disabled during connection/disconnection of dedicated phone

accessories.

Retu ASIC provides two output channels in either single-ended or differential format. Retu ASIC outputs XearL

and XearLC form the left channel audio output and XearR and XearRC the right channel audio output. XearLC

and XearRC are the ground pins if the output works in a single-ended operation.

On the Pop-Port side, HSEAR P and HSEAR N form the left channel output and HSEAR R P and HSEAR R N the right

channel output. Respectively, HSEAR N and HSEAR R N are the ground pins if the output works in a single-ended

9241872 (Issue 1)

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