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Table of Contents

General RF troubleshooting ..................................................................................................................................4–5

Introduction to RF troubleshooting ................................................................................................................4–5

RF key components ...........................................................................................................................................4–6

Non-replaceable RF components.....................................................................................................................4–8

General voltage checking .................................................................................................................................4–9

Phoenix self tests ........................................................................................................................................... 4–10

VCTCXO troubleshooting ..................................................................................................................................... 4–12

Receiver troubleshooting ................................................................................................................................... 4–13

Introduction to receiver (RX) troubleshooting............................................................................................ 4–13

RX GSM850 troubleshooting.......................................................................................................................... 4–14

RX GSM900 troubleshooting.......................................................................................................................... 4–15

RX GSM1800 troubleshooting........................................................................................................................ 4–16

RX GSM1900 troubleshooting........................................................................................................................ 4–17

GSM RX chain activation for manual measurements/GSM RSSI measurement ........................................ 4–18

WCDMA receiver troubleshooting................................................................................................................. 4–19

WCDMA RX chain activation for manual measurement.............................................................................. 4–20

WCDMA RSSI measurement ........................................................................................................................... 4–21

Transmitter troubleshooting ............................................................................................................................. 4–21

General instructions for transmitter (TX) troubleshooting........................................................................ 4–21

GSM transmitter troubleshooting................................................................................................................. 4–22

TX 850/900 troubleshooting......................................................................................................................... 4–24

TX 1800/1900 troubleshooting..................................................................................................................... 4–25

Checking antenna functionality.................................................................................................................... 4–26

WCDMA transmitter troubleshooting ........................................................................................................... 4–27

WCDMA transmitter troubleshooting flowchart.......................................................................................... 4–30

RF tunings ............................................................................................................................................................ 4–30

Introduction to RF tunings............................................................................................................................ 4–30

Autotuning for BB5 ........................................................................................................................................ 4–31

System mode independent manual tunings .................................................................................................... 4–32

RF channel filter calibration.......................................................................................................................... 4–32

PA (power amplifier) detection .................................................................................................................... 4–32

GSM receiver tunings........................................................................................................................................... 4–33

Rx calibration (GSM) ....................................................................................................................................... 4–33

Rx band filter response compensation (GSM).............................................................................................. 4–35

GSM transmitter tunings..................................................................................................................................... 4–39

Tx IQ tuning (GSM).......................................................................................................................................... 4–39

Tx power level tuning (GSM) ......................................................................................................................... 4–40

WCDMA receiver tunings..................................................................................................................................... 4–43

RX calibration (WCDMA) ................................................................................................................................. 4–43

WCDMA transmitter tunings............................................................................................................................... 4–45

Tx AGC & power detector (WCDMA)............................................................................................................... 4–45

Tx band response calibration (WCDMA) ....................................................................................................... 4–51

Tx LO leakage (WCDMA) ................................................................................................................................. 4–53

WLAN troubleshooting........................................................................................................................................ 4–54

WLAN functionality test using SB-7 and Phoenix........................................................................................ 4–54

WLAN layout and test points......................................................................................................................... 4–54

WLAN self tests ............................................................................................................................................... 4–55

WLAN functional tests.................................................................................................................................... 4–57

WLAN failure troubleshooting ...................................................................................................................... 4–59

WLAN basic checks troubleshooting ............................................................................................................ 4–61

RM-356

RF troubleshooting

Issue 1 COMPANY CONFIDENTIAL Page 4 –3