Table of Contents
Introduction to RF troubleshooting.....................................................................................................................7–5
RF key component placement...............................................................................................................................7–5
Receiver troubleshooting......................................................................................................................................7–9
Introduction to Rx troubleshooting................................................................................................................7–9
General instructions for RX troubleshooting..................................................................................................7–9
GSM Rx chain activation for manual measurements / GSM RSSI measurement........................................7–10
Transmitter troubleshooting..............................................................................................................................7–11
General instructions for TX troubleshooting................................................................................................7–11
TX 850/900 troubleshooting..........................................................................................................................7–14
TX 1800/1900 troubleshooting......................................................................................................................7–15
Checking antenna functionality.....................................................................................................................7–15
RF tunings.............................................................................................................................................................7–17
Introduction to RF tunings.............................................................................................................................7–17
RF autotuning..................................................................................................................................................7–17
System mode independent manual tunings.....................................................................................................7–20
Rf channel filter calibration............................................................................................................................7–20
PA (power amplifier) detection.....................................................................................................................7–21
GSM receiver tunings............................................................................................................................................7–21
Rx calibration (GSM)........................................................................................................................................7–21
Rx band filter response compensation (GSM)...............................................................................................7–25
GSM transmitter tunings......................................................................................................................................7–30
Tx IQ tuning (GSM)...........................................................................................................................................7–30
Tx power level tuning (GSM)..........................................................................................................................7–32
List of Tables
Table 12 Rf channel filter calibration tuning limits..........................................................................................7–20
Table 13 RF tuning limits in Rx calibration........................................................................................................7–24
List of Figures
Figure 42 RM-88 RF components..........................................................................................................................7–6
Figure 43 RM-88 BT component placement.........................................................................................................7–7
Figure 44 RM-88 component placement (top).....................................................................................................7–8
Figure 45 RM-88 component placement (bottom).............................................................................................7–8
Figure 46 RF Controls window............................................................................................................................7–10
Figure 47 RSSI Reading window.........................................................................................................................7–11
Figure 48 RF Controls window............................................................................................................................7–13
Figure 49 Main antenna.......................................................................................................................................7–16
Figure 50 Feed and GND spots of the main antenna........................................................................................7–16
Figure 51 Rf channel filter calibration typical values.......................................................................................7–20
RM-88
RF Troubleshooting and Manual Tuning Guide Nokia Customer Care
Issue 1 COMPANY CONFIDENTIAL Page 7 –3
Copyright © 2006 Nokia. All rights reserved.
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