User Guide

Table of Contents
General RF troubleshooting ..................................................................................................................................4–5
Introduction to RF troubleshooting ................................................................................................................4–5
RF key components ...........................................................................................................................................4–6
Non-replaceable RF components.....................................................................................................................4–6
Auto tuning for BB5.0 ............................................................................................................................................4–7
General voltage checking ......................................................................................................................................4–9
Self test troubleshooting.................................................................................................................................... 4–10
Receiver troubleshooting ................................................................................................................................... 4–11
Introduction to receiver (RX) troubleshooting............................................................................................ 4–11
GSM RX chain activation for manual measurements/GSM RSSI measurement ........................................ 4–11
GSM receiver troubleshooting flowchart ..................................................................................................... 4–12
Transmitter troubleshooting ............................................................................................................................. 4–13
Introduction to transmitter (TX) troubleshooting...................................................................................... 4–13
GSM transmitter troubleshooting................................................................................................................. 4–13
GSM transmitter troubleshooting flowchart ............................................................................................... 4–16
List of Figures
Figure 12 Auto tuning concept with CMU200......................................................................................................4–8
Figure 13 General voltage checking test points (main board, top side) ..........................................................4–9
Figure 14 Typical readings ................................................................................................................................. 4–15
RM-429
RF troubleshooting
Issue 1 COMPANY CONFIDENTIAL Page 4 –3
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