User Guide

Table of Contents
General RF troubleshooting ..................................................................................................................................4–5
General RF troubleshooting .............................................................................................................................4–5
RF key components ...........................................................................................................................................4–6
Auto tuning........................................................................................................................................................4–8
RH-116 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
RH-116 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
RH-117 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 ............................................................................................................ 4–31
RH-117 transmitter ............................................................................................................................................ 4–32
General instructions for GSM 850 TX troubleshooting................................................................................ 4–32
Troubleshooting diagram for GSM850 transmitter .................................................................................... 4–34
GSM850 TX output power.............................................................................................................................. 4–35
General instructions for GSM1900 TX troubleshooting .............................................................................. 4–37
Troubleshooting diagram for GSM1900 transmitter .................................................................................. 4–39
GSM1900 TX output power............................................................................................................................ 4–40
Synthesizer troubleshooting ............................................................................................................................. 4–42
Introduction.................................................................................................................................................... 4–42
Troubleshooting diagram for PLL synthesizer ............................................................................................ 4–44
Measurement points at the VCXO ................................................................................................................. 4–45
Antenna troubleshooting ................................................................................................................................... 4–46
Antenna troubleshooting diagram............................................................................................................... 4–46
List of Figures
Figure 29 RF key components on PWB.................................................................................................................4–6
Figure 30 Supply points at UEM (D2200)..............................................................................................................4–7
Figure 31 Supply point at RF IC (N7600) ..............................................................................................................4–7
Figure 32 GSM900 RF controls window................................................................................................................4–9
Figure 33 GSM900 receiver troubleshooting .................................................................................................... 4–10
Figure 34 900 RX I/Q signal waveform.............................................................................................................. 4–11
Figure 35 GSM1800 RF controls window........................................................................................................... 4–12
Figure 36 GSM1800 receiver troubleshooting .................................................................................................. 4–13
Figure 37 1800 RX I/Q signal waveform............................................................................................................ 4–14
Figure 38 RX measurements point of the control voltages to FEM N7700.................................................... 4–14
Figure 39 Measurement points at the RX SAW Filters – Z7600/Z7602 ........................................................... 4–15
RH-116; RH-117
RF Troubleshooting Instructions
Issue 1 COMPANY CONFIDENTIAL Page 4 –3
Copyright © 2008 Nokia. All rights reserved.