Nokia RH-64 Service Manual page 135

RH-64
RF troubleshooting
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
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