Nokia 1600 - Cell Phone 4 MB, Руководство по обслуживанию, Страница: 135 / 192

Table of Contents
General RF troubleshooting ......................................................................................................................................................... 7–5
General RF troubleshooting ................................................................................................................................................... 7–5
RF key components ................................................................................................................................................................... 7–5
Auto tuning ....................................................................................................................................................................................... 7–6
Receiver .............................................................................................................................................................................................. 7–7
General instructions for GSM 900 RX troubleshooting .................................................................................................. 7–7
Troubleshooting diagram for GSM 900 receiver .............................................................................................................. 7–9
General instructions for GSM 1800 RX troubleshooting ............................................................................................. 7–10
Troubleshooting diagram for GSM 1800 receiver ......................................................................................................... 7–12
Measurement points in the receiver ................................................................................................................................. 7–13
Transmitter ..................................................................................................................................................................................... 7–14
General instructions for GSM 900 TX troubleshooting ................................................................................................ 7–14
Troubleshooting diagram for GSM 900 transmitter .................................................................................................... 7–16
GSM 900 TX output power .................................................................................................................................................... 7–18
General instructions for GSM 1800 TX troubleshooting .............................................................................................. 7–21
Troubleshooting diagram for GSM 1800 transmitter .................................................................................................. 7–23
GSM 1800 TX output power ................................................................................................................................................. 7–25
Synthesizer troubleshooting .................................................................................................................................................... 7–28
Introduction ............................................................................................................................................................................. 7–28
List of Figures
Figure 104 RF key components on PWB .................................................................................................................................. 7–5
Figure 105 Supply points at UEM (D2200) ............................................................................................................................... 7–6
Figure 106 Supply point at RF IC (N7600) ................................................................................................................................ 7–6
Figure 107 Auto tuning concept with CMU200 ...................................................................................................................... 7–7
Figure 108 Auto tuning concept with RX and TX tuning devices and splitter ............................................................. 7–7
Figure 109 GSM 900 RF controls window ................................................................................................................................ 7–8
Figure 110 GSM 900 Receiver troubleshooting ...................................................................................................................... 7–9
Figure 111 900 RX I/Q signal waveform ................................................................................................................................ 7–10
Figure 112 GSM 1800 RF controls window ........................................................................................................................... 7–11
Figure 113 GSM 1800 Receiver troubleshooting ................................................................................................................. 7–12
Figure 114 1800 RX I/Q signal waveform ............................................................................................................................. 7–13
Figure 115 RX measurements point of the control voltages to FEM N7700 .............................................................. 7–13
Figure 116 Measurement points at the RX SAW Filters – Z7600/Z7602 ...................................................................... 7–14
Figure 117 RX I/Q signals ............................................................................................................................................................ 7–14
Figure 118 GSM 900 RF controls window .............................................................................................................................. 7–15
Figure 119 GSM 900 transmitter troubleshooting ............................................................................................................. 7–16
Figure 120 TX I/O signal .............................................................................................................................................................. 7–17
Figure 121 VC1, VC3 signals ....................................................................................................................................................... 7–17
Figure 122 TXP signal .................................................................................................................................................................. 7–18
Figure 123 TXC signals at PCL5 ................................................................................................................................................. 7–18
Figure 124 TX I/O signal .............................................................................................................................................................. 7–19
Figure 125 VC1, VC3 signals ....................................................................................................................................................... 7–19
Figure 126 TXP signal .................................................................................................................................................................. 7–20
Figure 127 TXC signals at PCL5 ................................................................................................................................................. 7–20
Figure 128 TXC signals at PCL19 ............................................................................................................................................... 7–21
Figure 129 GSM 1800 RF controls window ........................................................................................................................... 7–22
Figure 130 GSM 1800 transmitter troubleshooting ........................................................................................................... 7–23
Figure 131 TX I/O signal .............................................................................................................................................................. 7–24
RH-64
RF troubleshooting
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