Table Of Contents - Nokia NPL-4 Series Troubleshooting Instructions

Nokia Customer Care

Table of Contents

RF Troubleshooting ....................................................................................................... 7
Introduction to RF troubleshooting .............................................................................7
RF Key component placement .....................................................................................8
RF Test Points................................................................................................................ 9
Receiver .....................................................................................................................10
Transmitter .................................................................................................................11
Synthesizer .................................................................................................................11
RF in General ............................................................................................................... 12
RF Power Supply Configuration.................................................................................. 14
Receiver Verification and Troubleshooting ................................................................. 16
General instructions for RX troubleshooting .............................................................16
Measuring RX I/Q Signals using RSSI Reading..................................................... 16
Measuring RX performance using SNR measurement ........................................... 18
Measuring front-end power levels using spectrum analyzer................................... 19
Measuring analogue RX I/Q signals using oscilloscope ......................................... 20
Fault finding chart of the receiver ........................................................................... 21
Rx signal paths ...........................................................................................................25
Antenna switch (RX/TX switch)............................................................................. 25
Rx front-end ............................................................................................................ 26
RX paths of RF ASIC.............................................................................................. 27
Transmitter ................................................................................................................... 28
General instructions for transmitter troubleshooting .................................................28
Transmitter troubleshooting .......................................................................................28
Antenna switch (TX/RX switch)............................................................................. 28
GSM850 transmitter ..................................................................................................29
General instructions for GSM850 TX troubleshooting........................................... 29
GMSK ..................................................................................................................... 29
EDGE ...................................................................................................................... 30
Fault Finding Chart for GSM850 Transmitter ........................................................ 32
GMSK ..................................................................................................................... 33
EDGE ...................................................................................................................... 34
GSM900 transmitter ..................................................................................................34
General instructions for GSM TX troubleshooting................................................. 34
GMSK ..................................................................................................................... 34
EDGE ...................................................................................................................... 35
Fault finding chart for GSM900 transmitter ........................................................... 36
GMSK ..................................................................................................................... 37
EDGE ...................................................................................................................... 38
GSM1800 transmitter ................................................................................................38
General instructions for GSM1800 TX troubleshooting......................................... 38
GMSK ..................................................................................................................... 38
EDGE ...................................................................................................................... 39
Fault finding chart for GSM1800 transmitter ......................................................... 40
GMSK ..................................................................................................................... 41
EDGE ...................................................................................................................... 42
GSM1900 transmitter ................................................................................................42
General instructions for GSM1900 TX troubleshooting......................................... 42
Copyright © 2005 Nokia Corporation. All rights reserved.
Issue 2 05/05
Company confidential NPL-4/5/
Troubleshooting Instructions
Page No
Page 3