User Guide

Nokia Customer Care System Module
Company Confidential RH-30/RH-31
Issue 2 11/2004 © 2004 Nokia Corporation. Page 7
Introduction
Electrical modules
The system module1bj consists of Radio Frequency (RF) and baseband (BB). User Inter-
face (UI) contains display, keyboard, IR link, vibra, system connector and audio parts.
FM radio and camera module are located on the main PWB 1bj.
The electrical part of the keyboard is located in separate UI PWB named 1bk. 1bk is con-
nected to radio module PWB through a spring connector.
The baseband blocks provide the MCU, DSP, external memory interface and digital con-
trol functions in the UPP ASIC. Power supply circuitry, charging, audio processing and RF
control hard ware are in the UEM ASIC.
The purpose of the RF block is to receive and demodulate the radio frequency signal from
the base station and to transmit a modulated RF signal to the base station.
The UI module is described in this section of the manual.
Interconnection diagram
Figure 1: Interconnection diagram