Nokia 7260 Service Manual
ISSUE 1 09/2004
COMPANY CONFIDENTIAL
3
Copyright © 2004 Nokia. All Rights Reserved.
RM-17
6(b) - RF Troubleshooting Instructions
6(b) - RF Troubleshooting Instructions
Nokia Customer Care
Table of Contents
Page No
Test environment ............................................................................................... 5
Test conditions................................................................................................... 6
Test conditions................................................................................................... 6
Measuring RX performance using SNR measurement .................................... 8
Measuring front-end power levels using spectrum analyzer .......................... 10
Measuring analogue RX I/Q signals using oscilloscope ................................ 10
Measuring front-end power levels using spectrum analyzer .......................... 10
Measuring analogue RX I/Q signals using oscilloscope ................................ 10
General instructions for GSM TX troubleshooting ......................................... 18
Fault finding chart for GSM900 transmitter .................................................... 20
Fault finding chart for GSM900 transmitter .................................................... 20
General instructions for GSM1800 TX troubleshooting ................................. 22
Fault finding chart for GSM1800 transmitter .................................................. 24
Fault finding chart for GSM1800 transmitter .................................................. 24
General instructions for GSM1900 TX troubleshooting ................................. 26
Fault finding chart for GSM1900 transmitter .................................................. 28
Fault finding chart for GSM1900 transmitter .................................................. 28
General instructions for synthesizer troubleshooting ....................................... 31
Checking synthesizer operation....................................................................... 31
Fault finding chart for PLL synthesizer............................................................. 34
Frequency tables ............................................................................................. 36
Checking synthesizer operation....................................................................... 31
Fault finding chart for PLL synthesizer............................................................. 34
Frequency tables ............................................................................................. 36
GSM900 (including EGSM900) ...................................................................... 36
GSM1800 ....................................................................................................... 37
GSM1900 ....................................................................................................... 39
GSM1800 ....................................................................................................... 37
GSM1900 ....................................................................................................... 39
Receiver test points ......................................................................................... 44
Transmitter test points ..................................................................................... 46
Synthesizer test points..................................................................................... 49
Transmitter test points ..................................................................................... 46
Synthesizer test points..................................................................................... 49