Table Of Contents - Nokia RH-29 Series Manual

Table of Contents

Nokia Customer Care

RF Troubleshooting.................................................................................................................................. 3

Abbreviations in troubleshooting charts ....................................................................................... 3

Introduction ........................................................................................................................................... 5

RF Key component placement .......................................................................................................... 6

RF measurement points ...................................................................................................................... 7

RF supply points ................................................................................................................................. 7

Measurement points in the receiver ............................................................................................ 8

Measurement points in the transmitter...................................................................................... 9

Receiver ................................................................................................................................................... 11

General instructions for RX troubleshooting ..............................................................................11

Measuring RX I/Q signals using RSSI reading ........................................................................ 11

Measuring RX performance using SNR measurement ......................................................... 13

Measuring front end power levels using spectrum analyzer ............................................. 14

Receiver RSSI readings from Phoenix ...........................................................................................16

Receiver troubleshooting .................................................................................................................18

GSM900 Transmitter............................................................................................................................ 19

General instructions for GSM900 TX troubleshooting .............................................................19

900 Tx troubleshooting flowchart ............................................................................................. 29

GSM1800 Transmitter ......................................................................................................................... 30

General instructions for GSM1800 TX troubleshooting ..........................................................30

DCS1800 Tx troubleshooting flowchart .......................................................................................30

Path of the transmitted 1800 signal ............................................................................................30

The path of Mjoelner RF ASIC ..................................................................................................... 31

The path of the PA.......................................................................................................................... 31

Antenna Switch............................................................................................................................... 31

Troubleshooting chart for GSM1800 transmitter .....................................................................33

RH-29 Synthesizer................................................................................................................................ 35

General instructions for synthesizer troubleshooting ..............................................................35

26 MHz reference oscillator (VCXO) .............................................................................................37

VCO .........................................................................................................................................................38

troubleshooting chart for PLL Synthesizer ..................................................................................38

PLL power supply ................................................................................................................................39

Loop Filter ......................................................................................................................................... 39

VCO and power supply .................................................................................................................. 39

26MHz Bluetooth buffer .............................................................................................................. 40

Antenna ................................................................................................................................................... 40

Instructions for antenna troubleshooting ...................................................................................40

Phoenix Tuning...................................................................................................................................... 41

RF tuning after repairs ......................................................................................................................41

RX channel select filter calibration ...............................................................................................41

RX calibration (incl. VCXO Calibration) ........................................................................................42

EGSM900 and DCS1800 ............................................................................................................... 43

RX AGC limits ......................................................................................................................................47

RX band filter response compensation .........................................................................................47

EGSM900........................................................................................................................................... 47

DCS1800............................................................................................................................................ 50

TX I/Q tuning ........................................................................................................................................51

EGSM900........................................................................................................................................... 51

Issue 1 05/2004

Company Confidential

RH-29

6b - RF Troubleshooting

Page 1