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

RF key component placement...............................................................................................................................7-5

Troubleshooting test point locations...................................................................................................................7-7

Receiver troubleshooting......................................................................................................................................7-9

Introduction to Rx troubleshooting................................................................................................................7-9

GSM Rx chain activation for manual measurements / GSM RSSI measurement........................................7-10

Transmitter troubleshooting..............................................................................................................................7-10

General instructions for Tx troubleshooting................................................................................................7-10

Checking antenna functionality.....................................................................................................................7-12

Antenna troubleshooting...............................................................................................................................7-14

RF tunings.............................................................................................................................................................7-14

Introduction to RF tunings.............................................................................................................................7-14

Cable and adapter losses................................................................................................................................7-15

RF autotuning .................................................................................................................................................7-15

RF manual tuning guide.................................................................................................................................7-18

Required manual tunings after component changes.............................................................................7-18

System mode independent manual tunings...........................................................................................7-18

RF channel filter calibration.................................................................................................................7-18

PA (power amplifier) detection...........................................................................................................7-19

Temperature sensor calibration .........................................................................................................7-19

GSM receiver tunings.................................................................................................................................7-20

Rx calibration (GSM)..............................................................................................................................7-20

Rx band filter response compensation (GSM)....................................................................................7-22

Rx AM suppression (GSM)......................................................................................................................7-27

GSM transmitter tunings............................................................................................................................7-29

Tx IQ tuning (GSM).................................................................................................................................7-29

Tx power level tuning (GSM)................................................................................................................7-31

List of Tables

Table 11 RF channel filter calibration tuning limits.........................................................................................7-18

Table 12 Temperature sensor calibration tuning limits..................................................................................7-20

Table 13 RF tuning limits in Rx calibration........................................................................................................7-22

Table 14 RSSI level values....................................................................................................................................7-28

Table 15 Tx IQ tuning limits................................................................................................................................7-30

List of Figures

Figure 57 RF key component placement..............................................................................................................7-6

Figure 58 Test point locations for spectrum analyzer........................................................................................7-7

Figure 59 Test points for oscilloscope - bottom..................................................................................................7-8

Figure 60 Test points for oscilloscope - top.........................................................................................................7-9

Figure 61 RSSI Reading window.........................................................................................................................7-10

Figure 62 RF Controls window............................................................................................................................7-12

Figure 63 Feed and GND spots of the main antenna........................................................................................7-13

Figure 64 BT antenna...........................................................................................................................................7-13

Figure 65 RF channel filter calibration typical values.......................................................................................7-19

Issue 1

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COMPANY CONFIDENTIAL

Nokia Customer Care

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