User Guide

Table of Contents
Introduction to RF troubleshooting..........................................................................................................................................7–5
RF key component placement.....................................................................................................................................................7–5
Fault finding test point locations...............................................................................................................................................7–8
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
Transmitter troubleshooting....................................................................................................................................................7–14
General instructions for Tx troubleshooting..................................................................................................................7–14
Checking antenna functionality.........................................................................................................................................7–17
RF tunings.......................................................................................................................................................................................7–18
Introduction to RF tunings...................................................................................................................................................7–18
RF autotuning with CMU200................................................................................................................................................7–19
System mode independent manual tunings.......................................................................................................................7–25
RF channel filter calibration................................................................................................................................................7–25
PA detection.............................................................................................................................................................................7–26
Temperature sensor calibration .......................................................................................................................................7–26
GSM receiver tunings...................................................................................................................................................................7–27
Rx calibration (GSM)...............................................................................................................................................................7–27
Rx band filter response compensation (GSM)................................................................................................................7–31
Rx AM suppression (GSM)......................................................................................................................................................7–36
GSM transmitter tunings.............................................................................................................................................................7–37
Tx IQ tuning (GSM)..................................................................................................................................................................7–37
Tx power level tuning (GSM)................................................................................................................................................7–39
WCDMA receiver tunings.............................................................................................................................................................7–44
Rx AGC alignment (WCDMA).................................................................................................................................................7–44
Rx band response calibration (WCDMA)...........................................................................................................................7–45
WCDMA transmitter tunings......................................................................................................................................................7–48
Tx AGC & power detector (WCDMA)...................................................................................................................................7–48
Tx band response calibration (WCDMA)...........................................................................................................................7–53
Tx LO leakage (WCDMA).........................................................................................................................................................7–54
RF engine shield opening and closing instructions...........................................................................................................7–55
Opening and closing the RF engine shield......................................................................................................................7–55
List of Tables
Table 12 RF channel filter calibration tuning limits..........................................................................................................7–25
Table 13 Temperature sensor calibration tuning limits..................................................................................................7–27
Table 14 RF tuning limits in Rx calibration...........................................................................................................................7–30
Table 15 RSSI level values..........................................................................................................................................................7–37
List of Figures
Figure 56 RF key component placement, bottom.................................................................................................................7–6
Figure 57 RF key component placement, top.........................................................................................................................7–7
Figure 58 Test point locations for spectrum analyzer, bottom........................................................................................7–8
Figure 59 Test point locations for spectrum analyzer, top................................................................................................7–9
Figure 60 Test points for oscilloscope, bottom...................................................................................................................7–10
Figure 61 Test points for oscilloscope, top...........................................................................................................................7–10
RM-42
RF Troubleshooting and Manual Tuning Guide Nokia Customer Care
9241872 (Issue 1) Company Confidential Page 7–3
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