User Guide

Nokia Customer Care Troubleshooting Instructions
Company confidential NPL-4/5
Issue 1 05/04 Copyright © 2004 Nokia Corporation. All rights reserved. Page 3
Table of Contents
Page No
RF Troubleshooting.................................................................................................................................. 6
Introduction to RF troubleshooting ................................................................................................6
RF Key component placement ..........................................................................................................7
RF Test Points............................................................................................................................................ 8
Receiver ...................................................................................................................................................9
Transmitter ...........................................................................................................................................10
Synthesizer ...........................................................................................................................................10
RF in General.......................................................................................................................................... 11
RF Power Supply Configuration........................................................................................................ 13
Receiver Verification and Troubleshooting ................................................................................... 15
General instructions for RX troubleshooting ..............................................................................15
Measuring RX I/Q Signals using RSSI Reading....................................................................... 15
Measuring RX performance using SNR measurement ......................................................... 17
Measuring front-end power levels using spectrum analyzer............................................. 18
Measuring analogue RX I/Q signals using oscilloscope....................................................... 19
Fault finding chart of the receiver............................................................................................. 20
Rx signal paths ....................................................................................................................................24
Antenna switch (RX/TX switch) .................................................................................................. 24
Rx front-end..................................................................................................................................... 25
RX paths of RF ASIC....................................................................................................................... 26
Transmitter ............................................................................................................................................. 27
General instructions for transmitter troubleshooting .............................................................27
Transmitter troubleshooting ............................................................................................................27
Antenna switch (TX/RX switch) .................................................................................................. 27
GSM850 transmitter ..........................................................................................................................28
General instructions for GSM850 TX troubleshooting......................................................... 28
GMSK.................................................................................................................................................. 28
EDGE................................................................................................................................................... 29
Fault Finding Chart for GSM850 Transmitter......................................................................... 30
GMSK.................................................................................................................................................. 31
EDGE................................................................................................................................................... 32
GSM900 transmitter ..........................................................................................................................32
General instructions for GSM TX troubleshooting ................................................................ 32
GMSK.................................................................................................................................................. 32
EDGE................................................................................................................................................... 33
Fault finding chart for GSM900 transmitter .......................................................................... 34
GMSK.................................................................................................................................................. 35
EDGE................................................................................................................................................... 36
GSM1800 transmitter .......................................................................................................................36
General instructions for GSM1800 TX troubleshooting ...................................................... 36
GMSK.................................................................................................................................................. 36
EDGE................................................................................................................................................... 37
Fault finding chart for GSM1800 transmitter........................................................................ 38
GMSK.................................................................................................................................................. 39
EDGE................................................................................................................................................... 40
GSM1900 transmitter .......................................................................................................................40
General instructions for GSM1900 TX troubleshooting ...................................................... 40