User Guide

Table of Contents
Introduction to RF troubleshooting..........................................................................................................................................1–5
RF key component placement.....................................................................................................................................................1–5
Troubleshooting test point locations.......................................................................................................................................1–7
Receiver troubleshooting...........................................................................................................................................................1–10
Introduction to Rx troubleshooting..................................................................................................................................1–10
GSM Rx chain activation for manual measurements / GSM RSSI measurement.................................................1–10
WCDMA Rx chain activation for manual measurement..............................................................................................1–11
WCDMA RSSI measurement..................................................................................................................................................1–12
Transmitter troubleshooting....................................................................................................................................................1–13
General instructions for Tx troubleshooting..................................................................................................................1–13
Checking antenna functionality.........................................................................................................................................1–16
RF tunings.......................................................................................................................................................................................1–17
Introduction to RF tunings...................................................................................................................................................1–17
RF autotuning..........................................................................................................................................................................1–18
RF autotuning....................................................................................................................................................................1–18
RF manual tuning guide.......................................................................................................................................................1–23
Required manual tunings after component changes...........................................................................................1–23
System mode independent manual tunings............................................................................................................1–24
RF channel filter calibration.....................................................................................................................................1–24
PA (power amplifier) detection..............................................................................................................................1–25
Temperature sensor calibration ............................................................................................................................1–25
GSM receiver tunings.......................................................................................................................................................1–26
Rx calibration (GSM)...................................................................................................................................................1–26
Rx band filter response compensation (GSM)....................................................................................................1–30
Rx AM suppression (GSM)..........................................................................................................................................1–36
GSM transmitter tunings.................................................................................................................................................1–39
Tx IQ tuning (GSM)......................................................................................................................................................1–39
Tx power level tuning (GSM)....................................................................................................................................1–42
RM-84 WCDMA receiver tunings....................................................................................................................................1–45
Rx AGC alignment (WCDMA).....................................................................................................................................1–45
Rx band response calibration (WCDMA)...............................................................................................................1–47
RM-84 WCDMA transmitter tunings.............................................................................................................................1–50
Tx AGC & power detector (WCDMA).......................................................................................................................1–50
Tx band response calibration (WCDMA)...............................................................................................................1–55
Tx LO leakage (WCDMA).............................................................................................................................................1–56
List of Tables
Table 1 RF channel filter calibration tuning limits.............................................................................................................1–24
Table 2 Temperature sensor calibration tuning limits.....................................................................................................1–26
Table 3 RF tuning limits in Rx calibration.............................................................................................................................1–28
Table 4 RSSI level values.............................................................................................................................................................1–38
List of Figures
Figure 1 RF key component placement....................................................................................................................................1–6
Figure 2 Test point locations for spectrum analyzer...........................................................................................................1–7
Figure 3 Test points for oscilloscope - bottom......................................................................................................................1–8
Figure 4 Test points for oscilloscope - top..............................................................................................................................1–9
Figure 5 RSSI Reading window.................................................................................................................................................1–11
RM-84/99
RF Troubleshooting and Manual Tuning Guide Nokia Customer Care
Issue 1 Company Confidential Page 1–3
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