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RM-4/RM-5
Troubleshooting Instructions
Table of Contents
Baseband troubleshooting ............................................................................................. 5
Baseband testpads ....................................................................................................... 5
Component side (PWB backside) ............................................................................. 5
Display connector (PWB front side) ........................................................................ 5
Close up of testpads .................................................................................................. 6
Fault Finding Charts ...................................................................................................... 8
Phone is dead .............................................................................................................. 8
Flash programming does not work .............................................................................. 9
Power doesn't stay on or phone is jammed ............................................................... 10
No network or no call ................................................................................................ 12
SIM related faults ...................................................................................................... 13
SIM-Card rejected .................................................................................................. 14
Audio related faults ................................................................................................... 15
No sound in earpiece .............................................................................................. 15
Microphone does not work ..................................................................................... 16
Headset microphone does not work ........................................................................ 17
Headset earpiece does not work ............................................................................. 17
No sound from IHF or headset ............................................................................... 18
Handsfree speaker does not work ........................................................................... 19
Charging faults .......................................................................................................... 20
General RF Troubleshooting ....................................................................................... 23
RF Key component placement .................................................................................. 24
General Instructions for GSM900 RX Troubleshooting ........................................... 26
Troubleshooting Chart for GSM900 Receiver ....................................................... 27
General Instructions for GSM1800 RX Troubleshooting ......................................... 29
Troubleshooting Chart for GSM1800Receiver ...................................................... 30
Measurement points in the receiver ........................................................................ 31
RM-4/RM-5 Transmitter troubleshooting ................................................................. 33
Measurement points for the transmitter .................................................................. 33
General instructions for RM4/RM-5 GSM TX troubleshooting ............................... 34
PCN Transmitter General instructions for PCN TX troubleshooting ....................... 36
Synthesizer ................................................................................................................ 37
26 MHz Reference Oscillator (VCXO ) ................................................................. 37
VCO ........................................................................................................................ 37
Troubleshooting diagram for PLL Synthesizer ...................................................... 38
Phone fails after power on ...................................................................................... 39
Measurement points at the VCXO .......................................................................... 39
Measurement points at the PLL/VCO .................................................................... 40
Manual Alignment using Phoenix ............................................................................... 41
RX calibration ........................................................................................................... 41
GSM1800 RX calibration ......................................................................................... 42
RX channel select filter ............................................................................................. 43
RX Band Filter Response.......................................................................................... 44
Tx Power tuning ........................................................................................................ 45
ISSUE 1 02/2004
COMPANY CONFIDENTIAL
Copyright © 2003 Nokia. All Rights Reserved.
CCS Technical Documentation
Page No
3
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Table of Contents
Troubleshooting
