Nokia RM-132 Service Manual & Parts Manual page 221

Table of Contents

RM-132; RM-133

RF Troubleshooting and Manual Tuning Guide

Introduction to RF troubleshooting.....................................................................................................................7-5

RF key component placement...............................................................................................................................7-6

Self test troubleshooting.......................................................................................................................................7-8

RF ASIC troubleshooting.........................................................................................................................................7-9

Synthesizer troubleshooting...............................................................................................................................7-10

Synthesizer test points........................................................................................................................................7-11

Receiver troubleshooting....................................................................................................................................7-11

Introduction to Rx troubleshooting..............................................................................................................7-11

GSM Rx chain activation for manual measurements / GSM RSSI measurement........................................7-12

WCDMA Rx chain activation for manual measurement...............................................................................7-12

WCDMA RSSI measurement............................................................................................................................7-13

GSM receiver troubleshooting........................................................................................................................7-15

WCDMA receiver troubleshooting..................................................................................................................7-16

Receiver test points.........................................................................................................................................7-17

Transmitter troubleshooting..............................................................................................................................7-17

General instructions for Tx troubleshooting................................................................................................7-17

GSM transmitter troubleshooting..................................................................................................................7-21

WCDMA transmitter troubleshooting............................................................................................................7-22

Power amplifier (PA) and switch mode power supply (SMPS) troubleshooting............................................7-23

RF tunings.............................................................................................................................................................7-23

Introduction to RF tunings.............................................................................................................................7-23

RF autotuning..................................................................................................................................................7-24

RF manual tuning guide.................................................................................................................................7-27

Required manual tunings after component changes.............................................................................7-27

System mode independent manual tunings...........................................................................................7-28

RF channel filter calibration.................................................................................................................7-28

PA (power amplifier) detection...........................................................................................................7-28

Temperature sensor calibration .........................................................................................................7-29

GSM receiver tunings.................................................................................................................................7-29

Rx calibration (GSM)..............................................................................................................................7-29

Rx band filter response compensation (GSM)....................................................................................7-33

GSM transmitter tunings............................................................................................................................7-38

Tx IQ tuning (GSM).................................................................................................................................7-38

Tx power level tuning (GSM)................................................................................................................7-40

WCDMA receiver tunings............................................................................................................................7-44

RX calibration (WCDMA)........................................................................................................................7-44

WCDMA transmitter tunings......................................................................................................................7-46

Tx AGC & power detector (WCDMA).....................................................................................................7-46

Tx band response calibration (WCDMA)..............................................................................................7-52

Tx LO leakage (WCDMA)........................................................................................................................7-54

Antenna troubleshooting....................................................................................................................................7-54

List of Tables

Table 16 RF channel filter calibration tuning limits.........................................................................................7-28

Table 17 Temperature sensor calibration tuning limits..................................................................................7-29

Table 18 RF tuning limits in Rx calibration........................................................................................................7-31

List of Figures

Issue 1

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COMPANY CONFIDENTIAL

Nokia Customer Care

Page 7 -3

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