Nokia 6585 Service Manual 11gps34

CCS Technical Documentation

RH-34 Series Transceivers

Troubleshooting - GPS

Issue 1 11/2003 Confidential ©2003 Nokia Corporation

RH-34

Troubleshooting - GPS CCS Technical Documentation

Contents

Page No

Troubleshooting - Global Positioning System (GPS) Engine........................................ 3

GPS General Block Diagram .......................................................................................3

GPS RF Schematic ......................................................................................................3

GPS Testing .................................................................................................................4

GPS RF Probing Setup ................................................................................................7

GPS RF Probing Measurements................................................................................ 8

Page 2 ©2003 Nokia Corporation Confidential Issue 1 11/2003

RH-34

CCS Technical Documentation Troubleshooting - GPS

Troubleshooting - Global Positioning System (GPS) Engine

The RH-34 handset supports 800 Amps and 800 CDMA / 1900 CDMA + GPS with IS 2000
capability. The RH-34 engine supports CDMA and GPS functionality for Enhanced 911
(E911) services.

GPS circuitry utilizes RF signals from satellites stationed in geosynchronous orbit to
determine latitude and longitude of the handset. The GPS circuitry and the cellular
engine (CE) circuitry are completely separate in the handset. The GPS circuitry is located
almost exclusively on the secondary side of the PWB, underneath the display module.

GPS General Block Diagram

FilterFilter

LNA

Xtal

16.368MHz

GPS RF Schematic

Synthesiser

IF = 4.092MHz

GPS RF

AGC
Amp

4

ADC

TRF5101

Cellular Baseband

GPS RF Chip (N001)

Rx Data
Out

GPS

Baseband

Ref Clk

Filter 1 (Z001)

Filter 2 (Z002)

F Input

Circuits located on Bottom Layer

Issue 1 11/2003 Confidential ©2003 Nokia Corporation Page 3

Circuits located on Top Layer