User Guide

PAMS Technical Documentation Disassembly and Troubleshooting
TME-3
Issue 3 10/03 Nokia Corporation. Page 3
Table of Contents
Page No
Introduction to troubleshooting...................................................................................... 5
Disassembly of TME-3 .................................................................................................. 6
RF Troubleshooting ....................................................................................................... 9
Introduction to RF troubleshooting .............................................................................9
Component notes:...................................................................................................... 9
Component handling:................................................................................................ 9
Measurement notes:................................................................................................... 9
RF Key component placement ...................................................................................10
RF Measurement points .............................................................................................11
GSM900 & GSM1800 Transmitter ...........................................................................12
General instructions for Transmitter (Tx) troubleshooting..................................... 12
Transmitter troubleshooting diagrams ..................................................................14
Oscilloscope screen shots of transmitter signals..................................................... 17
GSM900 & GSM1800 Receiver ................................................................................20
General instructions for Rx troubleshooting........................................................... 20
LNA gainstep checking GSM900 & GSM1800 ...................................................24
Synthesizer .................................................................................................................25
General instructions for synthesizer troubleshooting.............................................. 25
Pictures of synthesizer signals................................................................................. 27
Baseband Troubleshooting........................................................................................... 30
Troubleshooting steps ................................................................................................30
Terminal is dead (1) ...................................................................................................31
Terminal is dead (2) ...................................................................................................32
Flashing fault (1) ........................................................................................................33
Flashing fault (2) ........................................................................................................34
Terminal jammed (1) .................................................................................................35
Terminal jammed (2) .................................................................................................36
SIM card fault ............................................................................................................37
Signal diagrams .........................................................................................................38
13 MHz clock.......................................................................................................... 38
26 MHz signal ......................................................................................................... 38
Sleep clock signal.................................................................................................... 39
1 MHZ Cbus clock signal........................................................................................ 39
Timing diagram .........................................................................................................40
Flash 1 signal........................................................................................................... 41
Flash 2 signal........................................................................................................... 42
Flash 3 signal........................................................................................................... 42