Nokia RM-272 - Table of Contents

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Table of Contents

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

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

BOM1 versus BOM3 .................................................................................................................................................4–6

Receiver troubleshooting ......................................................................................................................................4–9

Introduction to RX troubleshooting................................................................................................................4–9

General instructions for RX troubleshooting..................................................................................................4–9

Receiver (RX) troubleshooting ...................................................................................................................... 4–11

GSM Rx chain activation for manual measurements / GSM RSSI measurement....................................... 4–13

Transmitter troubleshooting ............................................................................................................................. 4–14

General instructions for TX troubleshooting............................................................................................... 4–14

Transceiver (TX) troubleshooting................................................................................................................. 4–17

Checking antenna functionality.................................................................................................................... 4–17

Synthesizer troubleshooting.............................................................................................................................. 4–21

RF tunings ............................................................................................................................................................ 4–22

Introduction to RF tunings............................................................................................................................ 4–22

Auto tuning for BB5.0 .................................................................................................................................... 4–22

System mode independent manual tunings .................................................................................................... 4–23

RF channel filter calibration.......................................................................................................................... 4–23

PA (power amplifier) detection .................................................................................................................... 4–24

GSM receiver tunings........................................................................................................................................... 4–24

Rx calibration (GSM) ....................................................................................................................................... 4–24

Rx band filter response compensation (GSM).............................................................................................. 4–27

GSM transmitter tunings..................................................................................................................................... 4–30

Tx IQ tuning (GSM).......................................................................................................................................... 4–30

Tx power level tuning (GSM) ......................................................................................................................... 4–32

List of Tables

Table 9 Rf channel filter calibration tuning limits ........................................................................................... 4–23

Table 10 RF tuning limits in Rx calibration....................................................................................................... 4–26

List of Figures

Figure 17 RF key components, bottom side main board ...................................................................................4–6

Figure 18 RF block ..................................................................................................................................................4–8

Figure 19 The visual differences between BOM1 and BOM3 ..............................................................................4–9

Figure 20 RF Controls window ........................................................................................................................... 4–11

Figure 21 RSSI Reading window........................................................................................................................ 4–14

Figure 22 RF Controls window ........................................................................................................................... 4–16

Figure 23 Location of the GSM and BT antenna C-clips on the PWB............................................................... 4–18

Figure 24 GSM and BT antenna contact pads on the antenna module.......................................................... 4–19

Figure 25 Antenna C-clips on the PWB .............................................................................................................. 4–20

Figure 26 Auto tuning concept with CMU200................................................................................................... 4–22

Figure 27 Rf channel filter calibration typical values ...................................................................................... 4–23

RM-272; RM-273

RF Troubleshooting and Manual Tuning Guide

Issue 1 COMPANY CONFIDENTIAL Page 4 –3