User Guide

Table of Contents
General RF troubleshooting ..................................................................................................................................4–5
General RF troubleshooting .............................................................................................................................4–5
RF key components ...........................................................................................................................................4–5
Auto tuning........................................................................................................................................................4–7
RM-394/RH-118 receiver .......................................................................................................................................4–8
General instructions for GSM900 RX troubleshooting ...................................................................................4–8
Troubleshooting diagram for GSM900 receiver .......................................................................................... 4–10
General instructions for GSM 1800 RX troubleshooting ............................................................................. 4–11
Troubleshooting diagram for GSM1800 receiver ........................................................................................ 4–13
Measurement points in the receiver ............................................................................................................ 4–14
RM-394/RH-118 transmitter ............................................................................................................................... 4–15
General instructions for GSM 900 TX troubleshooting................................................................................ 4–15
Troubleshooting diagram for GSM900 transmitter .................................................................................... 4–17
GSM900 TX output power.............................................................................................................................. 4–17
General instructions for GSM1800 TX troubleshooting .............................................................................. 4–20
Troubleshooting diagram for GSM1800 transmitter .................................................................................. 4–22
GSM1800 TX output power............................................................................................................................ 4–22
RM-395 receiver................................................................................................................................................... 4–25
General instructions for GSM 850 RX troubleshooting ............................................................................... 4–25
Troubleshooting diagram for GSM850 receiver .......................................................................................... 4–27
General instructions for GSM1900 RX troubleshooting .............................................................................. 4–28
Troubleshooting diagram for GSM1900 receiver ........................................................................................ 4–30
Measurement points in the receiver ............................................................................................................ 4–32
RM-395 transmitter ............................................................................................................................................ 4–33
General instructions for GSM 850 TX troubleshooting................................................................................ 4–33
Troubleshooting diagram for GSM850 transmitter .................................................................................... 4–35
GSM850 TX output power.............................................................................................................................. 4–36
General instructions for GSM1900 TX troubleshooting .............................................................................. 4–38
Troubleshooting diagram for GSM1900 transmitter .................................................................................. 4–40
GSM1900 TX output power............................................................................................................................ 4–41
Synthesizer troubleshooting ............................................................................................................................. 4–43
Introduction.................................................................................................................................................... 4–43
Troubleshooting diagram for PLL synthesizer ............................................................................................ 4–45
Measurement points at the VCXO ................................................................................................................. 4–46
Antenna troubleshooting ................................................................................................................................... 4–47
Antenna troubleshooting diagram............................................................................................................... 4–47
List of Figures
Figure 34 RM-394_395 Supply points at UEM (D2200) ........................................................................................4–6
Figure 35 RH-118 Supply points at UEM (D2200).................................................................................................4–6
Figure 36 Supply point at RF IC (N7600) ..............................................................................................................4–7
Figure 37 GSM900 RF controls window................................................................................................................4–9
Figure 38 GSM900 receiver troubleshooting .................................................................................................... 4–10
Figure 39 900 RX I/Q signal waveform.............................................................................................................. 4–11
Figure 40 GSM1800 RF controls window........................................................................................................... 4–12
Figure 41 GSM1800 receiver troubleshooting .................................................................................................. 4–13
Figure 42 1800 RX I/Q signal waveform............................................................................................................ 4–14
Figure 43 RX measurements point of the control voltages to FEM N7700.................................................... 4–14
Figure 44 Measurement points at the RX SAW Filters – Z7600/Z7602 ........................................................... 4–15
RM-394; RM-395; RH-118
RF Troubleshooting Instructions
Issue 1 COMPANY CONFIDENTIAL Page 4 –3
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