Table of Contents
General RF troubleshooting ..................................................................................................................................5–5
General RF troubleshooting .............................................................................................................................5–5
RF key components ...........................................................................................................................................5–5
Auto tuning.............................................................................................................................................................5–7
Receiver GSM900/1800 ..........................................................................................................................................5–8
General instructions for GSM900 RX troubleshooting ...................................................................................5–8
Troubleshooting diagram for GSM 900 receiver ......................................................................................... 5–10
General instructions for GSM 1800 RX troubleshooting ............................................................................. 5–11
Troubleshooting diagram for GSM 1800 receiver ....................................................................................... 5–12
Measurement points in the receiver ............................................................................................................ 5–13
Receiver GSM850/1900 ....................................................................................................................................... 5–13
General instructions for GSM 850 RX troubleshooting ............................................................................... 5–13
Troubleshooting diagram for GSM 850 receiver ......................................................................................... 5–15
General instructions for GSM1900 RX troubleshooting .............................................................................. 5–16
Troubleshooting diagram for GSM 1900 receiver ....................................................................................... 5–17
Measurement points in the receiver ............................................................................................................ 5–18
Transmitter GSM900/1800.................................................................................................................................. 5–18
General instructions for GSM 900 TX troubleshooting................................................................................ 5–18
Troubleshooting diagram for GSM 900 transmitter ................................................................................... 5–20
GSM900 TX output power.............................................................................................................................. 5–21
General instructions for GSM1800 TX troubleshooting .............................................................................. 5–24
Troubleshooting diagram for GSM 1800 transmitter ................................................................................. 5–25
GSM1800 TX output power............................................................................................................................ 5–25
Transmitter GSM850/1900.................................................................................................................................. 5–29
General instructions for GSM 850 TX troubleshooting................................................................................ 5–29
Troubleshooting diagram for GSM 850 transmitter ................................................................................... 5–31
GSM850 TX output power.............................................................................................................................. 5–32
General instructions for GSM1900 TX troubleshooting .............................................................................. 5–35
Troubleshooting diagram for GSM 1900 transmitter ................................................................................. 5–36
GSM1900 TX output power............................................................................................................................ 5–36
Crystal troubleshooting ..................................................................................................................................... 5–40
Introduction.................................................................................................................................................... 5–40
List of Figures
Figure 30 RF key components on PWB.................................................................................................................5–5
Figure 31 Supply and control points at FEM (N7100) and Litti (D2901)............................................................5–6
Figure 32 Auto tuning concept with CMU200......................................................................................................5–7
Figure 33 Auto tuning concept with RX and TX tuning devices and splitter....................................................5–7
Figure 34 GSM900 RF controls window................................................................................................................5–9
Figure 35 GSM 900 Receiver troubleshooting................................................................................................... 5–10
Figure 36 GSM1800 RF controls window........................................................................................................... 5–11
Figure 37 GSM 1800 Receiver troubleshooting ................................................................................................ 5–12
Figure 38 Measurement points at the RX SAW Filters – Z7101/Z7100 ........................................................... 5–13
Figure 39 GSM850 RF controls window............................................................................................................. 5–14
Figure 40 GSM 850 Receiver troubleshooting................................................................................................... 5–15
Figure 41 GSM 1900 RF controls window.......................................................................................................... 5–16
Figure 42 GSM 1900 Receiver troubleshooting ................................................................................................ 5–17
Figure 43 Measurement points at the RX SAW Filters – Z7101/Z7100 ........................................................... 5–18
Figure 44 GSM 900 RF controls window............................................................................................................ 5–19
RH-99; RH-100; RH-105; RH-106
RF troubleshooting
Issue 2 COMPANY CONFIDENTIAL Page 5 –3
Copyright © 2007 Nokia. All rights reserved.
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