User Guide

Table of Contents
General RF troubleshooting ..................................................................................................................................4–5
Introduction to RF troubleshooting ................................................................................................................4–5
RF key components ...........................................................................................................................................4–6
Auto tuning for BB5.0 ............................................................................................................................................4–6
General checkings...................................................................................................................................................4–7
Antenna line component checking..................................................................................................................4–7
Voltage checking ...............................................................................................................................................4–7
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
WCDMA RX chain activation for manual measurement/WCDMA RSSI measurement............................... 4–12
Transmitter troubleshooting ............................................................................................................................. 4–13
General instructions for transmitter (TX) troubleshooting........................................................................ 4–13
GSM transmitter troubleshooting................................................................................................................. 4–13
GSM transmitter troubleshooting flowchart ............................................................................................... 4–16
WCDMA transmitter troubleshooting ........................................................................................................... 4–17
WCDMA transmitter troubleshooting flowchart.......................................................................................... 4–18
List of Figures
Figure 30 Auto tuning concept with CMU200......................................................................................................4–7
Figure 31 General voltage checking test points..................................................................................................4–9
Figure 32 RX Control window with example settings ..................................................................................... 4–12
Figure 33 Typical readings ................................................................................................................................. 4–15
RM-313
RF troubleshooting
Issue 1 COMPANY CONFIDENTIAL Page 4 –3
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