Table Of Contents - Nokia RH-47 Series Rf Description And Troubleshooting

Nokia Customer Care

Table of Contents

Abbreviations ............................................................................................................................................ 5
Introduction to RF ................................................................................................................................... 6
RF power supply configuration ......................................................................................................... 9
General specifications of transceiver RH-47 ..............................................................................10
Introduction to RF Troubleshooting ................................................................................................ 11
Printed Wired Board ............................................................................................................................ 12
RF key component placement .........................................................................................................12
RF test points .......................................................................................................................................13
Test points RF supply voltages.................................................................................................... 14
RF test points Mjoelner chamber............................................................................................... 15
RF test points VCO chamber........................................................................................................ 15
RF test points PA chamber........................................................................................................... 16
Test points BB area......................................................................................................................... 16
Receiver Troubleshooting ................................................................................................................... 17
General instructions for RX troubleshooting ..............................................................................17
Measuring RX I/Q signals using RSSI reading ........................................................................ 17
Measuring RX performance using SNR measurement ......................................................... 18
Measuring front-end power levels using spectrum analyzer............................................. 20
Measuring analogue RX I/Q signals using oscilloscope....................................................... 21
Receiver troubleshooting .................................................................................................................22
Rx signal paths ....................................................................................................................................23
Antenna switch (RX/TX Switch).................................................................................................. 24
RX front-end .................................................................................................................................... 24
RX paths of Mjoelner RF ASIC..................................................................................................... 25
Transmitter ............................................................................................................................................. 26
General instructions for TX troubleshooting ..............................................................................26
TX signal paths ....................................................................................................................................26
Antenna switch (TX/RX switch) .................................................................................................. 28
GSM850 transmitter ..........................................................................................................................28
General instructions for GSM850 TX troubleshooting......................................................... 28
Troubleshooting for GSM850 transmitter ............................................................................... 29
GSM1900 (PCS) transmitter ............................................................................................................31
General instructions for GSM1900 TX troubleshooting ...................................................... 31
Troubleshooting for GSM1900 transmitter............................................................................. 32
Synthesizer ............................................................................................................................................. 35
General instructions for synthesizer troubleshooting ..............................................................35
Checking synthesizer operation .....................................................................................................35
26 MHz reference oscillator (VCXO) .............................................................................................36
VCO .........................................................................................................................................................37
Troubleshooting for PLL synthesizer .............................................................................................37
Frequency lists .....................................................................................................................................39
GSM850............................................................................................................................................. 39
GSM1900 .......................................................................................................................................... 40
DC Supply Current Check ................................................................................................................... 42
Phoenix Tunings after Repairs .......................................................................................................... 43
APPENDIX A: FLALI Test Cases with Hints for Repair................................................................. 44
APPENDIX B: FINUI Test Cases with Hints for Repair ................................................................ 50
Issue 1 05/04
Company Confidential
7 - RF Description and Troubleshooting
Copyright © 2004 Nokia Corporation
Company Confidential
RH-47
Page No
Page 3