Name: Nokia RM-237
Brand: Nokia
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Table of Contents

Introduction to RF troubleshooting .....................................................................................................................7–5

RF key components ................................................................................................................................................7–6

Receiver troubleshooting ......................................................................................................................................7–6

Introduction to RX troubleshooting................................................................................................................7–6

General instructions for RX troubleshooting..................................................................................................7–7

Receiver (RX) troubleshooting .........................................................................................................................7–8

GSM Rx chain activation for manual measurements / GSM RSSI measurement....................................... 7–10

Transmitter troubleshooting ............................................................................................................................. 7–11

General instructions for TX troubleshooting............................................................................................... 7–11

Transceiver (TX) troubleshooting................................................................................................................. 7–14

Checking antenna functionality.................................................................................................................... 7–14

Synthesizer troubleshooting.............................................................................................................................. 7–17

RF tunings ............................................................................................................................................................ 7–18

Introduction to RF tunings............................................................................................................................ 7–18

Auto tuning for BB5.0 .................................................................................................................................... 7–18

System mode independent manual tunings .................................................................................................... 7–19

RF channel filter calibration.......................................................................................................................... 7–19

PA (power amplifier) detection .................................................................................................................... 7–20

GSM receiver tunings........................................................................................................................................... 7–20

Rx calibration (GSM) ....................................................................................................................................... 7–20

Rx band filter response compensation (GSM).............................................................................................. 7–23

GSM transmitter tunings..................................................................................................................................... 7–26

Tx IQ tuning (GSM).......................................................................................................................................... 7–26

Tx power level tuning (GSM) ......................................................................................................................... 7–28

List of Tables

Table 12 Rf channel filter calibration tuning limits......................................................................................... 7–19

Table 13 RF tuning limits in Rx calibration....................................................................................................... 7–22

List of Figures

Figure 42 RF key components, bottom side main board ...................................................................................7–6

Figure 43 RF Controls window ..............................................................................................................................7–8

Figure 44 RSSI Reading window........................................................................................................................ 7–11

Figure 45 RF Controls window ........................................................................................................................... 7–13

Figure 46 Location of the GSM and BT antenna C-clips on the PWB............................................................... 7–15

Figure 47 GSM and BT antenna contact pads on the antenna module.......................................................... 7–16

Figure 48 Antenna C-clips on the PWB .............................................................................................................. 7–16

Figure 49 Auto tuning concept with CMU200................................................................................................... 7–18

Figure 50 Rf channel filter calibration typical values ...................................................................................... 7–19

RM-237

RF Troubleshooting and Manual Tuning Guide Nokia Customer Care

Issue 1 COMPANY CONFIDENTIAL Page 7 –3