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 RF voltage checking ................................................................................................................................ 4–7
General voltage checking ................................................................................................................................ 4–7
FEM Control Signal............................................................................................................................................ 4–8
Receiver troubleshooting .................................................................................................................................. 4–12
Introduction to receiver (RX) troubleshooting........................................................................................... 4–12
RF Test Points in RX Troubleshooting ......................................................................................................... 4–13
GSM RX chain activation for manual measurements/GSM RSSI measurement ....................................... 4–13
RX troubleshooting for GSM850................................................................................................................... 4–15
RX troubleshooting for GSM900................................................................................................................... 4–15
RX troubleshooting for GSM1800................................................................................................................. 4–17
RX troubleshooting for GSM1900................................................................................................................. 4–17
Transmitter troubleshooting ............................................................................................................................ 4–18
Introduction to transmitter (TX) troubleshooting..................................................................................... 4–18
RF Test Points in TX Troubleshooting.......................................................................................................... 4–19
RF Transmitter Self-test ................................................................................................................................ 4–19
TX troubleshooting for GSM850/900........................................................................................................... 4–23
TX troubleshooting for DCS1800/PCS1800.................................................................................................. 4–23
GSM transmitter troubleshooting................................................................................................................ 4–24
List of Tables
Table 2 21351/Juno Supplies ............................................................................................................................... 4–7
Table 3 FEM Supplies/Control Signals.................................................................................................................. 4–8
Table 4 FEM Control Logics ................................................................................................................................... 4–8
Table 5 Signals Coverage in RFPA Self-test Option.......................................................................................... 4–19
List of Figures
Figure 22 RF key components .............................................................................................................................. 4–6
Figure 23 Auto tuning concept with CMU200..................................................................................................... 4–7
Figure 24 General voltage checking test points (main board, bottom side) .................................................. 4–8
Figure 25 GMSK Control Signal in time domain............................................................................................... 4–12
Figure 26 RF transmitter & receiver test points .............................................................................................. 4–13
Figure 27 RF transmitter & receiver test points .............................................................................................. 4–19
Figure 28 Analyzer setting................................................................................................................................. 4–25
Figure 29 Phase error......................................................................................................................................... 4–26
Figure 30 Modulation/Switching spectrum ..................................................................................................... 4–26
Figure 31 Power/Burst....................................................................................................................................... 4–27
Figure 32 Edge.................................................................................................................................................... 4–27
RM-497
RF troubleshooting
Issue 1 COMPANY CONFIDENTIAL Page 4 – 3
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