NSB-9
Troubleshooting Instructions
CCS Technical Documentation
Page 4
Nokia Corporation
Issue 1 04/03
RF Troubleshooting
Introduction
This document describes the methods of RF troubleshooting for Iris NSB-9 transceiver.
Fault finding charts of the most common fails are included in this document. Arrows are
marked with
9
(OK) and
8
(NOT OK), respectively. Measurement equipment is marked as:
DMM
Digital Multimeter
OSC
Oscilloscope
SA
Spectrum Analyzer
Figures of typical signals and voltages at each testpoint are described in Chapter 8.
Location of testpoints are described in Chapters 9 and 10.
EQUIPMENT NEEDED:
NSB-9 module jig MJS-48, power and DAU-9S cables
DC power supply 3.9 VDC >3A
Radio Communication Tester with GSM850/1900 option
Spectrum analyzer and probe with frequency range up to 4 GHz
Digital multimeter (DMM)
Oscilloscope with 10:1 probe
PC with Phoenix software
USEFUL HINTS
Sometimes it is difficult to get reliable measurement results at high frequencies
(500...4000 MHz) because of probe properties etc. If measurement results of faulty
phone don't correspond to the results shown in this document it may be useful to mea-
sure a reference phone and finally, compare the results.
Special attention shall be paid with internal antenna. Visual inspection of antenna mod-
ule (shape of radiator metal) is needed to verify that antenna is GSM850/1900 antenna -
not GSM900/1800 used in similar European product. Both antennas behave very simi-
larly in MJF-32 jig so it may be impossible to distinguish them by doing measurements
over air interface.
