User Guide

Table of Contents
Introduction to RF troubleshooting .....................................................................................................................4–5
RF key components ................................................................................................................................................4–6
Receiver troubleshooting ......................................................................................................................................4–6
Introduction to RX troubleshooting................................................................................................................4–6
General instructions for RX troubleshooting..................................................................................................4–7
Receiver (RX) troubleshooting .........................................................................................................................4–8
GSM Rx chain activation for manual measurements / GSM RSSI measurement....................................... 4–10
Transmitter troubleshooting ............................................................................................................................. 4–11
General instructions for TX troubleshooting............................................................................................... 4–11
Transceiver (TX) troubleshooting................................................................................................................. 4–14
Checking antenna functionality.................................................................................................................... 4–14
Synthesizer troubleshooting.............................................................................................................................. 4–17
RF tunings ............................................................................................................................................................ 4–18
Introduction to RF tunings............................................................................................................................ 4–18
Auto tuning for BB5.0 .................................................................................................................................... 4–18
System mode independent manual tunings .................................................................................................... 4–19
RF channel filter calibration.......................................................................................................................... 4–19
PA (power amplifier) detection .................................................................................................................... 4–20
GSM receiver tunings........................................................................................................................................... 4–20
Rx calibration (GSM) ....................................................................................................................................... 4–20
Rx band filter response compensation (GSM).............................................................................................. 4–23
GSM transmitter tunings..................................................................................................................................... 4–26
Tx IQ tuning (GSM).......................................................................................................................................... 4–26
Tx power level tuning (GSM) ......................................................................................................................... 4–28
List of Tables
Table 9 Rf channel filter calibration tuning limits ........................................................................................... 4–19
Table 10 RF tuning limits in Rx calibration....................................................................................................... 4–22
List of Figures
Figure 17 RF key components, bottom side main board ...................................................................................4–6
Figure 18 RF Controls window ..............................................................................................................................4–8
Figure 19 RSSI Reading window........................................................................................................................ 4–11
Figure 20 RF Controls window ........................................................................................................................... 4–13
Figure 21 Location of the GSM and BT antenna C-clips on the PWB............................................................... 4–15
Figure 22 GSM and BT antenna contact pads on the antenna module.......................................................... 4–16
Figure 23 Antenna C-clips on the PWB .............................................................................................................. 4–16
Figure 24 Auto tuning concept with CMU200................................................................................................... 4–18
Figure 25 Rf channel filter calibration typical values ...................................................................................... 4–19
RM-274
RF Troubleshooting and Manual Tuning Guide
Issue 1 COMPANY CONFIDENTIAL Page 4 –3
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