User Guide

RH-30/RH-31 Company Confidential

System Module Nokia Customer Care

by the UEM and the earpiece driver in UEM is a bridge amplifier. In RH-30/RH-31 8mm

PICO type earpiece is used.

Figure 14: Internal speaker

IHF speaker & stereo audio amplifier

Integrated Hands Free Speaker, 16mm MALT, is used to generate speech audio, alerting

and warning tones in RH-30/RH-31. Audio amplifier is controlled by the UPP. Speaker

capsule is mounted in the C-cover. Spring contacts are used to connect the IHF Speaker

contacts to the main PWB.

Figure 15: Digital Interface of Audio Amplifier

Common mode

choke

EARP

EARN

UEM

Output

Mode

Select

Digital

Volume

Control

Bias

Bypass

Rin

Lin

EN CL

DAT

Lout -

Lout +

Rout -

Rout +

out -

out +

VBAT

GND

Phone In HS

1uF

Radio audio

IHF Speaker

Radio audio

Stereo Headset

Amplifier

SPI

Phone In IHF