Table of Contents
General RF troubleshooting ..................................................................................................................................4–5
Introduction to RF troubleshooting ................................................................................................................4–5
RF key components ...........................................................................................................................................4–6
Auto tuning for BB5.0 ............................................................................................................................................4–7
WLAN autotuning ...................................................................................................................................................4–7
General chekings ....................................................................................................................................................4–8
Antenna line component checking..................................................................................................................4–8
Voltage checking ...............................................................................................................................................4–8
Self test troubleshooting.................................................................................................................................... 4–11
Receiver troubleshooting ................................................................................................................................... 4–12
Introduction to receiver (RX) troubleshooting............................................................................................ 4–12
GSM RX chain activation for manual measurements/GSM RSSI measurement ........................................ 4–12
WCDMA RX chain activation for manual measurement/WCDMA RSSI measurement............................... 4–13
Transmitter troubleshooting ............................................................................................................................. 4–14
General instructions for transmitter (TX) troubleshooting........................................................................ 4–14
GSM transmitter troubleshooting................................................................................................................. 4–14
GSM transmitter troubleshooting flowchart ............................................................................................... 4–17
WCDMA transmitter troubleshooting ........................................................................................................... 4–17
WCDMA transmitter troubleshooting flowchart.......................................................................................... 4–19
WLAN RF troubleshooting................................................................................................................................... 4–19
Introduction to WLAN RF troubleshooting .................................................................................................. 4–19
General WLAN RF troubleshooting ............................................................................................................... 4–20
Radiated testing with battery cover ............................................................................................................ 4–20
Conducted testing with MJ-131 module jig................................................................................................. 4–21
Conducted WLAN troubleshooting .............................................................................................................. 4–23
WLAN front-end test ...................................................................................................................................... 4–23
WLAN front-end troubleshooting ................................................................................................................ 4–25
WLAN ASIC test................................................................................................................................................ 4–25
WLAN ASIC troubleshooting .......................................................................................................................... 4–28
WLAN Tx power autotuning.......................................................................................................................... 4–28
List of Figures
Figure 29 Auto tuning concept with CMU200......................................................................................................4–7
Figure 30 WLAN autotune test equipment setup ...............................................................................................4–8
Figure 31 Tx Control window................................................................................................................................4–9
Figure 32 General voltage checking test points............................................................................................... 4–10
Figure 33 RF control window............................................................................................................................. 4–15
Figure 34 Typical readings ................................................................................................................................. 4–16
Figure 35 Test equipment setup........................................................................................................................ 4–21
Figure 36 Test equipment setup for conductive test....................................................................................... 4–22
Figure 37 Test points around the WLAN ASIC................................................................................................... 4–26
Figure 38 Test point around the clock buffer circuit ....................................................................................... 4–27
RM-247
RF troubleshooting
Issue 1 COMPANY CONFIDENTIAL Page 4 –3
Copyright © 2008 Nokia. All rights reserved.
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