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RM-291
RF troubleshooting
General RF troubleshooting ..................................................................................................................................7-5
General RF troubleshooting .............................................................................................................................7-5
RF key components ...........................................................................................................................................7-6
Auto tuning .............................................................................................................................................................7-7
Receiver ...................................................................................................................................................................7-9
General instructions for GSM900 RX troubleshooting ...................................................................................7-9
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Introduction....................................................................................................................................................
PLL Synthesizer Troubleshooting
FM radio
troubleshooting...................................................................................................................................
troubleshooting..............................................................................................................................
Antenna troubleshooting
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 GSM900 RF controls window
Figure 97 900 RX I/Q signal
Figure 98 GSM1800 RF controls
Figure 99 GSM 1800 Receiver troubleshooting
Figure 100 1800 RX I/Q signal waveform
Figure 101 RX measurements point of the control voltages to FEM N7700
Figure 102 Measurement points at the RX SAW Filters - Z7600/Z7602
Figure 103 RX I/Q
signals....................................................................................................................................
Figure 104 GSM 900 RF controls
Figure 105 GSM900 transmitter troubleshooting
Figure 106 TX I/O
signal......................................................................................................................................
Figure 107 VC1, VC3 signals
Figure 108 TXP
signal..........................................................................................................................................
Figure 109 TXC signals at PCL5
Figure 110 TXC signals at
Figure 111 GSM 1800 RF controls
Figure 112 TX I/O
signal......................................................................................................................................
Figure 113 VC1, VC2, VC3 signals
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Troubleshooting
