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Customer Care Solutions
NEM-1 Series Transceivers
Troubleshooting Instructions
Issue 1 06/03 Nokia Corporation
NEM-1 Company confidential
Troubleshooting Instructions CCS Technical Documentation
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Page 2 Nokia Corporation. Issue 1 06/03
Company confidential NEM-1
CCS Technical Documentation Troubleshooting Instructions
Table of Contents
Page No
Baseband troubleshooting .............................................................................................. 5
Test points in baseband ................................................................................................5
Troubleshooting diagrams.............................................................................................. 7
Main Troubleshooting Diagram ..................................................................................7
Phone is dead ...............................................................................................................8
UPP Flash Programming Fault ....................................................................................9
ADSP Flash Programming Fault ...............................................................................10
Phone is jammed ........................................................................................................12
SIM card fault (Insert SIM / Card rejected) ...............................................................13
Keypad Fault ..............................................................................................................14
Display Fault ..............................................................................................................17
Illumination fault .......................................................................................................18
Charger Fault .............................................................................................................19
Accessory Fault .........................................................................................................20
USB fault ...................................................................................................................21
Acoustic fault .............................................................................................................22
Media Troubleshooting ..............................................................................................25
ADSP/CODEC fault ..................................................................................................29
RF Troubleshooting ..................................................................................................... 31
Introduction to RF troubleshooting ...........................................................................31
RF Key component placement ...................................................................................32
RF Measurement points .............................................................................................33
GSM900 & GSM1800 Transmitter ...........................................................................34
General instructions for Tx troubleshooting ........................................................... 34
Transmitter troubleshooting .................................................................................... 35
HELGO troubleshooting ......................................................................................... 36
PA and Antenna switch ........................................................................................... 37
Diagrams of transmitter signals............................................................................... 38
GSM900 and GSM1800 Receiver .............................................................................40
General instructions for Rx troubleshooting ........................................................... 40
Troubleshooting diagram for GSM900 receiver ..................................................... 43
Troubleshooting diagram for GSM1800 receiver ................................................... 44
Synthesizer .................................................................................................................45
General instructions for synthesizer troubleshooting.............................................. 45
Synthesizer troubleshooting .................................................................................... 46
FM Radio ...................................................................................................................48
FM Radio troubleshooting diagram ........................................................................ 49
Pictures of FM radio signals.................................................................................... 50
Issue 1 06/03 Nokia Corporation. Page 3
NEM-1 Company confidential
Troubleshooting Instructions CCS Technical Documentation
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Page 4 Nokia Corporation. Issue 1 06/03
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CCS Technical Documentation Troubleshooting Instructions
Baseband troubleshooting
Test points in baseband
Test points for baseband are described in the following figures:
Figure 1: Baseband top
USBD-
USBVBus
USBD+
GND
GND
VMMC
J883
J884
J882
VPP J881
FBUSTX
MBUS
FBUSRX
GND
Issue 1 06/03 Nokia Corporation. Page 5
NEM-1 Company confidential
Troubleshooting Instructions CCS Technical Documentation
Figure 2: Baseband Bottom
J359 - FMClk VCORE 1.5V VR5 2.78V
J358 - FMWrEn VR7 2.78V
J357 - FMCtrlClk VR2 2.78V
J356 - FMCtrlDa
J381 - FMAudioOutL
J382 - FMAudioOutR
J403 - SLEEPX VR6 2.78V
J414 - DBUSDA VR4 2.78V
J402 - PURX VR3 2.78V
J404 - SLEEPCLK
VANA 2.78V
J406 - CBUSCLK
J412 - FBUSRX
J409 - MBUSTX
J410 - MBUSRX
J411 - FBUSTX
VIO 1.8V
VFLASH2 2.78V
(if FM radio is active)
VFLASH1 2.78V
Page 6 Nokia Corporation. Issue 1 06/03
Company confidential NEM-1
CCS Technical Documentation Troubleshooting Instructions
Troubleshooting diagrams
The following diagrams describe baseband troubleshooting.
It is highly recommended to run all BB selftests first to get a hint about defect parts.
Main Troubleshooting Diagram
Figure 3: Baseband general troubleshooting
Start
Phone is
Phone totally dead Yes
dead
No
Flash programming doesnt work Yes Flash faults
No
Phone doesn't start up
Phone is
or the phone is Yes
jammed
jammed
No
Charger
Charging doesn