Nokia NEM-4 Series Guide

Customer Care Solutions
NEM-4 Series Transceivers
Issue 1 09/2003 Copyright 2003 Nokia Corporation Page 6(a)-1
Company Confidential
6 Troubleshooting Instructions

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CCS Technical Documentation
Company confidential NEM-4
Draft 2 8/2003 Copyright Nokia. All rights reserved.. Page 1
Introduction to NEM-4 Troubleshooting ....................................................................... 3
General guidelines for NEM-4 trouble shooting............................................................ 3
Tools needed for Troubleshooting ...............................................................................3
General guidelines .......................................................................................................3
Nominal current consumption .....................................................................................4
Troubleshooting paths.................................................................................................... 5
Dead or jammed device ...............................................................................................5
Partially damaged device .............................................................................................6
Most common symptoms reported by customer ..........................................................6
ASIC is changed ..........................................................................................................7
Test points ....................................................................................................................7
“CONTACT SERVICE” on display ..........................................................................10
Baseband HW subarea Troubleshooting...................................................................... 11
Flashing Troubleshooting ..........................................................................................11
ADSP flashing Troubleshooting ................................................................................13
Energy management Troubleshooting .......................................................................14
Audio Troubleshooting ..............................................................................................31
Headset Troubleshooting ...........................................................................................35
Memory Troubleshooting ..........................................................................................37
MMC Troubleshooting ..............................................................................................38
VIBRA .......................................................................................................................40
ZOCUS ......................................................................................................................41
UI Troubleshooting ...................................................................................................... 41
UI Troubleshooting cases ..........................................................................................41
Keymat Backlight ......................................................................................................42
Keyboard ....................................................................................................................43
Display blank .............................................................................................................44
Backlight does not turn on .........................................................................................45
FM Radio Troubleshooting.......................................................................................... 46
FM Radio component layout .....................................................................................46
FM Radio Troubleshooting diagram .........................................................................48
RF Troubleshooting ..................................................................................................... 53
Abbreviations in fault finding charts .........................................................................53
Introduction ................................................................................................................53
RF Key component placement ...................................................................................54
RF Measurement points .............................................................................................55
RF in general................................................................................................................ 58
RF Power Supply Configuration.................................................................................. 61
Receiver ....................................................................................................................... 62
General instructions for RX Troubleshooting ...........................................................62
Receiver fault finding ................................................................................................66
Rx Signal paths ..........................................................................................................68
Transmitter ................................................................................................................... 70
General instructions for EGSM TX Troubleshooting ...............................................70
TX Path of the transmitted EGSM900 signal ............................................................79
General instructions for GSM1800/1900 TX Troubleshooting .................................83
DCS 1800/PCS 1900 Tx fault finding flow chart ......................................................83
Path of the transmitted GSM1800/1900 signal ..........................................................84

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Fault finding chart for GSM1800/GSM1900 transmitter ..........................................85
NEM-4 Synthesizer...................................................................................................... 86
General instructions for Synthesizer Troubleshooting ..............................................86
26 MHz reference oscillator (VCXO) .......................................................................90
VCO ...........................................................................................................................90
Fault finding chart for PLL Synthesizer ....................................................................91
PLL Block diagram ....................................................................................................92
PLL power supply ......................................................................................................93
Frequency lists ...........................................................................................................96
Phoenix tuning ............................................................................................................. 99
RF tuning after repairs ...............................................................................................99
RX Calibration (incl. VCXO Calibration) .................................................................99
RX AGC limits ........................................................................................................104
RX Band Filter Response Compensation ................................................................107
TX Power tuning ......................................................................................................114
TX I/Q Tuning .........................................................................................................116
Bluetooth Troubleshooting ......................................................................................130

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Introduction to NEM-4 Troubleshooting
This document is intend to be a guide for localizing and repairing electrical faults in the
NEM-4 device. First there is a brief guide for fault localizing. Then fault repairing is
divided into Troubleshooting paths.
Before any service operation you must be familiar with the NEM-4 product and module
level architecture. You have to also be familiar with the NEM-4 specified service tools
such as the Phoenix service software, flashing tools and software.
General guidelines for NEM-4 trouble shooting
Tools needed for Troubleshooting
• Service tools (as listed at service tools chapter in service manual)
• Laboratory power supply with current indicator
• Oscilloscope
• Digital multimeter …
General guidelines
If the device cannot be turned on by any means, see “dead device” trouble shooting
Current consumption (missing consumption) gives an idea whether the device is able to
start up.
Dropping supply voltage or very large current consumption indicates a short circuit
Check whether the connection with Phoenix works and what can be discovered with
Phoenix (ADC-readings, baseband selftest, bb-calibrations etc.)
Check baseband selftests with Phoenix if “CONTACT SERVICE” is shown on the display.
Check visually display and rocker faults
Force phone to LOCAL mode and make keyboard test by phoenix
Check that board-to-board connector is OK, and connectors make good contacts.
If liquid damage, stop repairing!
Flash phone before disassembling it if fault is not obvious and Phoenix connection is OK.
Disassemble phone:
Check failed module visually:
Mechanical damages?

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Solder joints OK?
Continue with specific trouble shooting procedure for the module:
If there is an obvious fault, repair it before reflashing the device
Flash first if a fault is not obvious
If flashing is not working go to flashing trouble shooting
Due to CSP packages short circuits or broken solder joints are not easily seen. If the
examined signal seems to be continuously in low or high level, then measure for possible
short circuit to ground (signal low) or to supply voltage (signal high) Note that if a prob-
lem is not found from any visible contact/component it can be under CSPs where the sig-
nal is connected.
Care must be taken when assembling and disassembling the transceiver. Failure to do
this may result in unnecessary damage to device.
Nominal current consumption
NOTE: Service tools need some amount of current to work.
The following current consumption values are measured from a complete NEM-4.
Vbatt = 3.6V
Measured nominal currents are drawn from the main battery.
Measurements have been made with a current probe connected to an oscilloscope.
Operating Mode Current Consumption
Idle 5mA
2W audio call 350mA (LOCAL MODE)
MP3 playback nominal 80mA
FM-radio playback nominal 25mA

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Troubleshooting paths
Dead or jammed device
Disassemble
Check UI
connector
Replace
UI module
display
display

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Partially damaged device
If the device is working, but some functionality is missing try to localize where the prob-
lems is and see relevant part of this manual. E.g audio is not working see “Audio Trouble-
shooting” , if charging is not working see chapter Charging Troubleshooting etc.
Most common symptoms reported by customer
In this chapter is described most common symptoms reported by customers when the
device is brought in for service. Some tips where the trouble can be found are given also.
When Troubleshooting use these tips and follow the given Troubleshooting path.
Most common symptoms for audio problems
“Earpiece sound is missing”
”Headset is not recognized”
”Microphone is not working”
”Volume cannot be adjusted”
”Ringing tones does not work”
”Audio volume too low”
“Radio does not work”
“IHF sound is missing”
“Headset sound is missing”
“MP3/AAC play does not work”
If the symptom is something like above, see audio Troubleshooting.
Most common symptoms for USB and BT problems
“Bluetooth does not work or a connection can not be established”
“USB connection does not work or PC cannot find device”
If symptoms are something like above, follow USB or Bluetooth Troubleshooting guide-
lines.
Symptoms related to energy management
“Phone does not stay on”
”Charging is not working”
”Time is lost during battery change”
”Charging takes too long”
”Operating time is very short”

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These symptoms lead to relevant part of energy management Troubleshooting
Problems related to UI:
“Keypad is not working”
”Backlight is dim”
”Backlight not even”
”Backlight is blinking”
”Keypad or display backlight is not working”
”Display related problems”
“Rocker is not working”
Most common RF related symptoms:
“Call cannot be made”
”Phone does not find signal”
”Call is often dropped”
See RF Troubleshooting.
ASIC is changed
ASIC’s can be changed only at a defined service level.
UEM changed
If UEM is changed baseband calibrations should be made. New IMEI must be pro-
grammed also. ZOCUS calibration is not necessary.
UPP_WD2 changed
IMEI must be reprogrammed.
ZOCUS changed
Zocus must be re-calibrated
Test points
Table 1: Test points in Baseband area (F6)
Test
Point Signal description
J128 GPIO1 (WD2->ADSP)
J129 GPIO0 (ADSP->WD2)
J904 VCOREA enable (N261 EN, UEMRST)
J900 VHPA enable (N266 EN, GENIO14)
J901 VAUD (N265 EN, GENIO25)
J903 VAUX2 enable (N264 EN, GENIO16)
J218 GENTest0
J004 N330 (Boomer) _SHUTDOWN (from WD2 GENIO8)

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J906 ADSP S11 (WD2->ADSP through UEM level shifter
IRLEDC)
J907 ADSP S13 (ADSP->WD2 through UEM level shifter
IRRXN)
J558 ADSP CLKR0 (BCLK_OUT) to AIC
J559 ADSP DR0 (DIGITAL_AUDIO_IN) from AIC
J560 ADSPDX0 (DIGITAL_AUDIO_OUT) to AIC
J561 ADSP FSX0 (LRC_OUT) to AIC
J562 ADSP C1 (ADSP Flash OE#)
J563 ADSP C2 (ADSP Flash WE#)
J567 ADSP C3 (ADSP Flash CE1#)
J564 ADSP GPIO2
J565 ADSP GPIO3
J312 FLASH _CE (D310)
J315 FLASH CLK (D310, D311, D313)
J311 FLASH _CE (D311)
J313 FLASH _CE (D313)
J314 SDRAM CLK (D312)
J197 GPIO13 (Keyboard matrix ROW0)
J196 GPIO12 (Keyboard matrix ROW1)
J179 GPIO16 (Keyboard matrix COL4)
J116 GPIO30 (Keyboard matrix COL5)
J119 GPIO15 (Keyboard matrix ROW3)
J118 GPIO14 (Keyboard matrix ROW2)
J176 GPIO18 (Keyboard matrix ROW5)
J175 GPIO17 (Keyboard matrix ROW4)
J177 GPIO10 (Keyboard matrix COL2)
J178 GPIO11 (Keyboard matrix COL3)
J117 GPIO8 (Keyboard matrix COL0)
J180 GPIO9 (Keyboard matrix COL1)
J181 GENIO1 (ROCKER1)
J145 GENIO2 (ROCKER2)
J182 GENIO10 (ROCKER3)
J194 GENIO28 (MUSIC PL KEY)

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J184 GENIO11 (ROCKER5)
J183 GENIO13 (ROCKER4)
J912 LCD signal
J185 LCD signal
J186 LCD signal
J187 LCD signal
J188 LCD signal
J189 LCD signal
J190 LCD signal
J191 LCD signal
J113 LCD signal
J114 LCD signal
J905 UEM DLIGHT (Display LED driver control)
J404 SIM Data
J405 SIM Clock
J406 SIM Reset
J913 MMC CMD
J914 MMCDAT0
J577 N470 Dir3
J579 N470 Dir2
J576 N470 A1
J578 N470 A3
J593 N470 A2
J910 N470 EN2
J911 N470 EN1
J568 USB PU ?
J569 USB D+
J575 USB D-
J398 VBAT (After current sense monitor) R382
J902 N301Zint

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“CONTACT SERVICE” on display
CONTACT SERVICE on display (Self-tests by Phoenix)
Display information: “Contact Service”
This fault means that software is able to run and thus the watchdog of UEM can be
served.
Selftest functions are executed when the phone is powered on and if one or more selft-
est functions fail, the message “Contact Service” is shown on the display.
MCU selftest cases can be split into two categories: The ones that are executed during
power up and the ones that are executed only with a PC connected. These test and the
items included are as follows:
If some selftest is failed, see relevant chapter in this Troubleshooting document.

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Baseband HW subarea Troubleshooting
Flashing Troubleshooting
NEM-4 has three memory components installed on the main pwb. The best indication of
which one is causing problems can be obtained by flashing the device. It has to be kept
in mind that all three flashes are interfaced with UPP WD2 asic that might it self have
some problems. The necessary steps are described below. Phoenix error messages during
flashing greatly help on defining what is wrong. To be able to flash the device, most
device BB area components must function properly.
Flashing
faults
Measure
FBUSTX line
during flash
programming is
it 1.8V?
Change
UEM
No
Yes
Check BSI line
Battery connector, flex,
C239, Z383, R384
Yes
Yes
The phone does
not set Flashbus
TXD line high
after startup
The phone does
not set the
flashbus TXD
line low after the
startup
No
Measure BSI
pulse during
flash
programming
Is it ok?
No
Change UPP
WD2
No
Memory
faults page
2
Check connections
Check BB voltages
Check clocks
Change UEM
Yes
Check BSI line
Battery connector,
C226, R220 and R385

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Memory
faults
page2
Change Flash Chip
according to Phoenix
messages
If both chips report wrong
ID's -> change UPP_WD2
Yes
Change SDRAM
Yes
Prommer
message about
sdram failure?
Wrong
manufacturer ID
and device ID
No
No
Retest
"Flash informs
about a failure"
during flashing
No
Check flash0 bypass caps, check
Vpp connection to flasher, Check
Vpp resistor(4.7k)
Ok->Change flash0
Yes
Yes
Activity in sdram
clk J108 pad?
No
Change UPP_WD2
Yes
Voltages
VmemA and
VioA ok?
No
EM
troubles
No
"Secondary
receive fail" or
"Algorithm send
failed"
messa
g
e?
Change UPP_WD2
Yes
Activity in SDRAM
Clk J314 pad?
Voltages
VmemA and
Vio OK?
Vpp resistor (R314, 4.7k)
ADSP Flashing

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ADSP flashing Troubleshooting
ADSP flash environment consists of ADSP, ADSP flash, EMIF (external memory interface),
communication interfaces (USB and UPP/UEM), ADSP flash protecting control and power
supplies for ADSP and ADSP flash.

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Energy management Troubleshooting
Device does not stay on
If the device is switched off without any visible reason, there may be problems in the fol-
lowing areas:
• UEM watchdog problem (WD is not updated by SW)
• BSI line problem (BSI line is floating => contact failure)
• Battery line problem
• Soldering problem
The most likely reason is UEM WD (watchdog), which turns the device off after about 32
seconds if SW is jammed.
This may caused by SW problem, UPP_WD2 problem (Not server by SW), UEM or memory
malfunctions.
The following tests are recommended:
• General power checking
• Clocks
•Memorytesting
• Serial Interface
If there is something wrong in BSI line, the device seems to be dead after the power key
is pressed. However the regulators of the device are on a few seconds before the power-
down.
This mode can easily be detected from the current consumption of the device. After a
few seconds the current consumption drops almost to 0 mA.
In this case check component or soldering
• Battery connector X381
EMI-filter R385
UEM D190 (pin number C2)
If phone boots to TEST or LOCAL mode with normal battery, BSI is short circuited to
ground. Check EMI-filter and filtering capacitors, which are located to BSI.

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General power checking
Use service tool FLA-41R. Battery voltage should be at least 3.6V. After phone disassem-
bly, use module jig MJS-8Q.
Short circuit in Vbatt1-3,
Vbattbb or Vbattihf lines. Try to
find short circuit. Check
components which are able to
short cuircuit these lines,
(filtering components etc.)
Vbatt1-3, Vbatbb,
Vbattihf meas. from
C301, C302 & C313
PURX (J125)
1.8V?
Check Vcorea
and Vmema
voltages, OK?
See next page
Check sleep
clock (J124)
32.768Khz?
Meas. from
C197, OK?
Check B190,
C196, C197
VBATHF or BT voltage lines. Try to
VBATHF,
BT voltage meas.
(
R433
)
(
J123
)

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VCOREA Troubleshooting

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VMEMA Troubleshooting

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Audio Power Troubleshooting