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Table of Contents

General RF troubleshooting ..................................................................................................................................4–5

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

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

Auto tuning for RF ..................................................................................................................................................4–6

General voltage checking ......................................................................................................................................4–7

Selftest troubleshooting........................................................................................................................................4–8

RF selftests ........................................................................................................................................................4–8

Fatal selftests troubleshooting..................................................................................................................... 4–10

Receiver troubleshooting ................................................................................................................................... 4–13

Introduction to receiver (RX) troubleshooting............................................................................................ 4–13

GSM RX chain activation for manual measurements/GSM RSSI measurement ........................................ 4–14

Transmitter troubleshooting ............................................................................................................................. 4–15

General instructions for transmitter (TX) troubleshooting........................................................................ 4–15

GSM transmitter troubleshooting................................................................................................................. 4–15

Bluetooth and FM radio troubleshooting ......................................................................................................... 4–17

Bluetooth troubleshooting ........................................................................................................................... 4–17

FM radio troubleshooting.............................................................................................................................. 4–18

List of Figures

Figure 14 RF key components ...............................................................................................................................4–6

Figure 15 Auto tuning concept with CMU200......................................................................................................4–6

Figure 16 General voltage checking test points (main board, bottom side) ...................................................4–8

Figure 17 Testpoints used after fatal self tests................................................................................................ 4–10

Figure 18 Settings: Time 1ns/d + 0.1Vpp/d ...................................................................................................... 4–11

Figure 19 Settings: Time 1ns/d + 0.3Vpp/d ...................................................................................................... 4–11

Figure 20 Frequency ~ 100kHz........................................................................................................................... 4–13

Figure 21 Typical readings ................................................................................................................................. 4–16

Figure 22 Troubleshooting diagram: Bluetooth .............................................................................................. 4–17

RM-352; RM-354

RF troubleshooting

Issue 1 COMPANY CONFIDENTIAL Page 4 –3