User Guide

Table of Contents
General RF troubleshooting ..................................................................................................................................7–5
Introduction to RF troubleshooting ................................................................................................................7–5
RF key components ...........................................................................................................................................7–6
Non-replaceable RF components.....................................................................................................................7–7
General voltage checking .................................................................................................................................7–8
Phoenix self tests ........................................................................................................................................... 7–10
VCTCXO troubleshooting ..................................................................................................................................... 7–12
Receiver troubleshooting ................................................................................................................................... 7–13
Introduction to receiver (RX) troubleshooting............................................................................................ 7–13
RX GSM850 troubleshooting.......................................................................................................................... 7–14
RX GSM900 troubleshooting.......................................................................................................................... 7–15
RX GSM1800 troubleshooting........................................................................................................................ 7–16
RX GSM1900 troubleshooting........................................................................................................................ 7–17
GSM RX chain activation for manual measurements/GSM RSSI measurement ........................................ 7–18
WCDMA receiver troubleshooting................................................................................................................. 7–19
WCDMA RX chain activation for manual measurement.............................................................................. 7–20
WCDMA RSSI measurement ........................................................................................................................... 7–21
Transmitter troubleshooting ............................................................................................................................. 7–21
General instructions for transmitter (TX) troubleshooting........................................................................ 7–21
GSM transmitter troubleshooting................................................................................................................. 7–22
TX 850/900 troubleshooting......................................................................................................................... 7–24
TX 1800/1900 troubleshooting..................................................................................................................... 7–25
Checking antenna functionality.................................................................................................................... 7–26
WCDMA transmitter troubleshooting ........................................................................................................... 7–27
WCDMA transmitter troubleshooting flowchart.......................................................................................... 7–29
RF tunings ............................................................................................................................................................ 7–29
Introduction to RF tunings............................................................................................................................ 7–29
Autotuning for BB5 ........................................................................................................................................ 7–30
System mode independent manual tunings .................................................................................................... 7–31
RF channel filter calibration.......................................................................................................................... 7–31
PA (power amplifier) detection .................................................................................................................... 7–31
GSM receiver tunings........................................................................................................................................... 7–32
Rx calibration (GSM) ....................................................................................................................................... 7–32
Rx band filter response compensation (GSM).............................................................................................. 7–35
GSM transmitter tunings..................................................................................................................................... 7–38
Tx IQ tuning (GSM).......................................................................................................................................... 7–38
Tx power level tuning (GSM) ......................................................................................................................... 7–40
WCDMA receiver tunings..................................................................................................................................... 7–42
RX calibration (WCDMA) ................................................................................................................................. 7–42
WCDMA transmitter tunings............................................................................................................................... 7–45
Tx AGC & power detector (WCDMA)............................................................................................................... 7–45
Tx band response calibration (WCDMA) ....................................................................................................... 7–51
Tx LO leakage (WCDMA) ................................................................................................................................. 7–53
List of Tables
Table 11 Rf channel filter calibration tuning limits......................................................................................... 7–31
Table 12 RF tuning limits in Rx calibration....................................................................................................... 7–34
RM-176
RF troubleshooting Nokia Customer Care
Issue 1 COMPANY CONFIDENTIAL Page 7 –3
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