Nokia Cellphone 3600, Service Manual

Page: 85 / 128

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
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