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

9241872 (Issue 1)

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Company Confidential

Nokia Customer Care

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