User Guide

Table of Contents
General RF troubleshooting...................................................................................................................................7–5
General RF troubleshooting.............................................................................................................................7–5
RF key components...........................................................................................................................................7–6
Auto tuning.............................................................................................................................................................7–8
Receiver...................................................................................................................................................................7–9
General instructions for GSM 850 RX troubleshooting..................................................................................7–9
Troubleshooting diagram for GSM 850 receiver..........................................................................................7–11
General instructions for GSM1900 RX troubleshooting...............................................................................7–12
Troubleshooting diagram for GSM 1900 receiver........................................................................................7–14
Measurement points in the receiver.............................................................................................................7–16
General instructions for GSM900 RX troubleshooting.................................................................................7–18
Troubleshooting diagram for GSM 900 receiver..........................................................................................7–20
General instructions for GSM 1800 RX troubleshooting..............................................................................7–21
Troubleshooting diagram for GSM 1800 receiver........................................................................................7–23
Measurement points in the receiver.............................................................................................................7–25
Transmitter...........................................................................................................................................................7–27
General instructions for GSM 850 TX troubleshooting................................................................................7–27
Troubleshooting diagram for GSM 850 transmitter....................................................................................7–29
GSM850 TX output power...............................................................................................................................7–32
General instructions for GSM1900 TX troubleshooting...............................................................................7–35
Troubleshooting diagram for GSM 1900 transmitter..................................................................................7–36
GSM1900 TX output power.............................................................................................................................7–39
General instructions for GSM 900 TX troubleshooting................................................................................7–42
Troubleshooting diagram for GSM 900 transmitter....................................................................................7–43
GSM900 TX output power...............................................................................................................................7–45
General instructions for GSM1800 TX troubleshooting...............................................................................7–48
Troubleshooting diagram for GSM 1800 transmitter..................................................................................7–50
GSM1800 TX output power.............................................................................................................................7–52
Synthesizer troubleshooting ..............................................................................................................................7–55
Introduction.....................................................................................................................................................7–55
Antenna troubleshooting....................................................................................................................................7–57
Antenna troubleshooting...............................................................................................................................7–57
List of Figures
Figure 92 Supply points at UEM (D2200)..............................................................................................................7–7
Figure 93 Supply point at RF IC (N7600)...............................................................................................................7–7
Figure 94 Auto tuning concept with CMU200......................................................................................................7–8
Figure 95 Auto tuning concept with RX and TX tuning devices and splitter....................................................7–8
Figure 96 GSM850 RF controls window..............................................................................................................7–10
Figure 97 GSM 850 Receiver troubleshooting...................................................................................................7–11
Figure 98 850 RX I/Q signal waveform...............................................................................................................7–12
Figure 99 GSM 1900 RF controls window...........................................................................................................7–13
Figure 100 GSM 1900 Receiver troubleshooting...............................................................................................7–14
Figure 101 1900 RX I/Q signal waveform..........................................................................................................7–15
Figure 102 RX measurements point of the control voltages to FEM N7700...................................................7–16
Figure 103 Measurement points at the RX SAW Filters – Z7600/Z7602..........................................................7–17
Figure 104 RX I/Q signals.....................................................................................................................................7–18
Figure 105 GSM900 RF controls window............................................................................................................7–19
Figure 106 900 RX I/Q signal waveform.............................................................................................................7–21
RH-86; RH-87
RF troubleshooting Nokia Customer Care
Issue 1 COMPANY CONFIDENTIAL Page 7 –3
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