User Guide

Table of Contents
Introduction to RF troubleshooting.....................................................................................................................7–5
RF key component placement...............................................................................................................................7–5
Receiver troubleshooting......................................................................................................................................7–6
Introduction to Rx troubleshooting................................................................................................................7–6
GSM Rx chain activation for manual measurements / GSM RSSI measurement..........................................7–6
WCDMA Rx chain activation for manual measurement.................................................................................7–7
WCDMA RSSI measurement...............................................................................................................................7–8
Transmitter troubleshooting................................................................................................................................7–9
General instructions for Tx troubleshooting..................................................................................................7–9
Checking antenna functionality.....................................................................................................................7–12
RF tunings.............................................................................................................................................................7–14
Introduction to RF tunings.............................................................................................................................7–14
RF autotuning..................................................................................................................................................7–15
RF autotuning.............................................................................................................................................7–15
RF manual tuning guide.................................................................................................................................7–17
Required manual tunings after component changes.............................................................................7–17
System mode independent manual tunings...........................................................................................7–17
Rf channel filter calibration.................................................................................................................7–17
PA (power amplifier) detection...........................................................................................................7–18
Temperature sensor calibration .........................................................................................................7–18
GSM receiver tunings.................................................................................................................................7–19
Rx calibration (GSM)..............................................................................................................................7–19
Rx band filter response compensation (GSM)....................................................................................7–21
Rx AM suppression (GSM)......................................................................................................................7–25
GSM transmitter tunings............................................................................................................................7–27
Tx IQ tuning (GSM).................................................................................................................................7–27
Tx power level tuning (GSM)................................................................................................................7–29
WCDMA receiver tunings............................................................................................................................7–31
Rx AGC alignment and Rx band response calibration (WCDMA).......................................................7–31
WCDMA transmitter tunings......................................................................................................................7–35
Tx AGC & power detector (WCDMA).....................................................................................................7–35
Tx band response calibration (WCDMA)..............................................................................................7–41
Tx LO leakage (WCDMA)........................................................................................................................7–43
List of Tables
Table 5 Rf channel filter calibration tuning limits............................................................................................7–18
Table 6 Temperature sensor calibration tuning limits.....................................................................................7–19
Table 7 RF tuning limits in Rx calibration..........................................................................................................7–21
Table 8 RSSI level values......................................................................................................................................7–26
Table 9 Tx IQ tuning limits..................................................................................................................................7–28
Table 10 Spectrum analyzer settings: EDGE OFF tuning...................................................................................7–30
List of Figures
Figure 58 RSSI Reading window...........................................................................................................................7–7
Figure 59 Rx Control window................................................................................................................................7–8
Figure 60 RF Controls window............................................................................................................................7–11
Figure 61 Tx Control window..............................................................................................................................7–12
Figure 62 Feed and GND spots of the main antenna........................................................................................7–13
RM-49
RF Troubleshooting and Manual Tuning Guide Nokia Customer Care
Issue 1 COMPANY CONFIDENTIAL Page 7 –3
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