Nokia N-Gage Service Manual 06 nem 4 troubleshooting

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Nokia Customer Care

NEM-4 Series Transceivers

6 - Troubleshooting Instructions

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Table of Contents

Page No

Introduction to NEM-4 Troubleshooting....................................................................... 5

General guidelines for NEM-4 Troubleshooting ........................................................... 5

Tools needed for troubleshooting ................................................................................5

General guidelines .......................................................................................................5

Nominal current consumption .....................................................................................6

Troubleshooting Paths.................................................................................................... 7

Dead or jammed device ...............................................................................................7

Partially damaged device .............................................................................................8

Most common symptoms reported by customer ..........................................................8

ASIC is changed ..........................................................................................................9

Test points ....................................................................................................................9

“CONTACT SERVICE” on display ..........................................................................12

Baseband HW Subarea Troubleshooting..................................................................... 13

Flashing troubleshooting ...........................................................................................13

ADSP flashing troubleshooting .................................................................................15

Energy management troubleshooting ........................................................................16

Audio troubleshooting ...............................................................................................33

Headset troubleshooting ............................................................................................37

Memory troubleshooting ...........................................................................................39

MMC troubleshooting ...............................................................................................40

VIBRA .......................................................................................................................43

ZOCUS ......................................................................................................................44

UI Troubleshooting...................................................................................................... 44

UI troubleshooting cases ............................................................................................44

Keymat backlight .......................................................................................................45

Keyboard ....................................................................................................................46

Display blank .............................................................................................................47

Backlight does not turn on .........................................................................................48

FM Radio Troubleshooting.......................................................................................... 49

FM radio component layout .......................................................................................49

FM radio troubleshooting diagram ............................................................................51

Diagrams of FM radio signals ..............................................................................53

RF Troubleshooting ..................................................................................................... 55

Abbreviations in fault finding charts .........................................................................55

Introduction ................................................................................................................56

RF key component placement ...................................................................................57

RF measurement points .............................................................................................58

RF in General............................................................................................................... 62

RF Power Supply Configuration.................................................................................. 64

Receiver ....................................................................................................................... 65

General instructions for RX troubleshooting .............................................................65

Receiver fault finding ................................................................................................70

Rx signal paths ...........................................................................................................72

Transmitter................................................................................................................... 75

General instructions for EGSM TX troubleshooting .................................................75

TX path of the transmitted EGSM900 signal ............................................................82

General instructions for GSM1800/1900 TX Troubleshooting .................................86

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DCS 1800/PCS 1900 Tx fault finding flow chart ......................................................86

Path of the transmitted GSM1800/1900 signal ..........................................................87

Fault finding chart for GSM1800/GSM1900 transmitter ..........................................89

NEM-4 Synthesizer...................................................................................................... 91

General instructions for synthesizer troubleshooting ................................................91

26 MHz reference oscillator (VCXO) .......................................................................94

VCO ...........................................................................................................................94

Fault finding chart for PLL synthesizer .....................................................................95

PLL block diagram ....................................................................................................96

PLL power supply ......................................................................................................97

Frequency lists .........................................................................................................100

Phoenix Tuning.......................................................................................................... 103

RF tuning after repairs .............................................................................................103

RX calibration (incl. VCXO calibration) .................................................................103

RX AGC limits ........................................................................................................108

RX band filter response compensation ....................................................................109

TX power tuning ......................................................................................................117

TX I/Q tuning ..........................................................................................................119

Bluetooth troubleshooting .......................................................................................133

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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 Troubleshooting

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 problem is not found from any visible contact/component it can be under CSPs where the signal 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

display

Replace

UI module

display

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Partially damaged device

If the device is working, but some functionality is missing try to localize where the problems is and see relevant part of this manual. E.g audio is not working see “Audio Troubleshooting” , 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 guidelines.

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 programmed also. ZOCUS calibration is not necessary.

UPP_WD2 changed

IMEI must be reprogrammed.

ZOCUS changed

Zocus must be re-calibrated

Test points

Test Point

J128 GPIO1 (WD2->ADSP)

Signal description

Table 1: Test points in Baseband area

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

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Test Point

J004 N330 (Boomer) _SHUTDOWN (from WD2 GENIO8)

J906 ADSP S11 (WD2->ADSP through UEM level shifter

J907 ADSP S13 (ADSP->WD2 through UEM level shifter

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#)

J312 FLASH _CE (D310)

J315 FLASH CLK (D310, D311, D313)

Signal description

IRLEDC)

IRRXN)

J311 FLASH _CE (D311)

J313 FLASH _CE (D313)

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)

J184 GENIO11 (ROCKER5)

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Test Point

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

Signal description

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 selftest 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

The phone does not set Flashbus

TXD line high

after startup

The phone does

not set the

flashbus TXD

line low after the

startup

Memory

faults page

Yes

Measure BSI

pulse during

flash

programming

Is it ok?

Yes

Measure

FBUSTX line

during flash

programming is

it 1.8V?

Yes

Check connections Check BB voltages Check clocks Change UEM

Check BSI line

Battery connector, flex,

Battery connector,

C239, Z383, R384

C226, R220 and R385

Change

UEM

Change UPP

WD2

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Memory

faults

page2

"Secondary

receive fail" or

"Algorithm send

failed"

messa

Prommer

message about

sdram failure?

manufacturer ID

and device ID

Wrong

Yes

Change UPP_WD2

Activity in SDRAM

Activity in sdram

Clk J314 pad?

clk J108 pad?

Change UPP_WD2

Change Flash Chip

according to Phoenix

messages If both chips report wrong ID's -> change UPP_WD2

Yes

Change SDRAM

Yes

Voltages

VmemA and

Vio OK?

VioA ok?

troubles

"Flash informs

about a failure"

during flashing

Retest

ADSP Flashing

Yes

Check flash0 bypass caps, check Vpp connection to flasher, Check

Vpp resistor(4.7k)

Vpp resistor (R314, 4.7k)

Ok->Change flash0

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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 following 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

•Memory testing

• 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 powerdown.

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 disassembly, use module jig MJS-8Q.

Short circuit in Vbatt1-3,

VBATHF or BT voltage lines. Try to

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,

BT voltage meas.

Vbattihf meas. from

C301, C302 & C313

VBATHF,

R433

PURX (J125)

1.8V?

Check Vcorea

and Vmema

voltages, OK?

See next page

Check sleep

J123

clock (J124)

32.768Khz?

Meas. from C197, OK?

Check B190,

C196, C197

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VCOREA troubleshooting

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VMEMA troubleshooting

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Audio power troubleshooting

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Clocks troubleshooting

Clocks include the following:

RF-clock ADSP Clock DBUS, CBUS clocks Flash and SDRAM clocks Sleep clock Bluetooth clock SIM clock MMC clock

NEM-4 has three external oscillators for baseband clocking. The main clock is generated by 26MHz oscillator (B601) and routed through Mjoelner RF ASIC to UPP_WD2 engine ASIC. Sleep Clock is generated by 32kHz oscillator to UEM, which then supplies it to UPP_WD2, Bluetooth module and FM radio chip. The third oscillator generates 12MHz clock for ADSP and AIC. UPP_WD2 uses the system clock to generate various clocks for different purposes

12MHz Oscillator

VCXO 26MHz

Mjoelner

SysClk

Bluetooth

Audio Clock

Amadeus

Audio Codec

RFClk

RFBusClk

Figure 1: Clock diagram.

Buffer

MMC Clock

UPPWD2 UEM

SDRClk

Flash Clock

MMC

RFConvClock

SIM Clock

DBus Clock

Sleep Clock

Nectar

CBus Clock

FM Clock

SIM Clock

SDRAM

SIMZocusFlash

System clock can be measured from the lower pad of capacitor C171. This clock should be running when phone is on.

In SLEEP mode the VCXO is off. UEM generates low frequency clock signal (32.768 kHz) that is fed to UPP_WD2, Bluetooth and ZOCUS.

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When the flashing of the device does not succeed, but powering is OK, follow these instructions.

Note: The absence of clocks may indicate that the device (put phone to LOCAL mode when the sleep is not allowed or press buttons so that phone is not in sleep mode) is in sleep mode. Make sure that the device is not in sleep during clocks measuring.

IMPORTANT: Clock signals have to be measured with 1MΩ (or greater) probes!

Measure signal from J170. This should be 26Mhz clock signal. See RF Troubleshooting for further information.

Check the crystal oscillator (B190) is oscillating at 32.768kHz frequency. If not change B190. If ok, measure SleepClk from test point from capacitor C521. Frequency should be the same 32.678kHz (see Figure 2, “Sleep clock,” on page 22 below.) If not change UEM.

Figure 2: Sleep clock

ADSP Clock (12MHz sine wave) can be measured from oscillator B550.

Charging checking

Use the BL5-C battery and JBV-1/MJF-26 calibration set to test charging. (NOTE: power supply cannot be charged if it not has a current sinking capability.) When you are charging totally empty battery, remember that start-up charging might take a little bit longer time than normal. During this time display is blank.

If charger is not NMP approved type and its current and voltage is not within NMP charger window then software does not start charging and there is “NOT CHARGING” on the display. Voltage should be between 5.3V - 9.5V and current between 200mA –

(Capacitor C521)

(Testpoint J124)

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900mA

Remove and reconnect battery and charger few times before you start to measure device. This check ensures that the fault really exists.

(Refer to “Charging Troubleshooting”)

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Figure 3: Charging Troubleshooting

Phoenix and JBV1/MJF26

Check BL5-C, Btemp, BSI,

X606, R385, R404

X381,

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Nothing

happens

ACP-12

when ACP-2 is connected

Measure Vchar

at C384. Is it

at C388 and C387. Is it

>3.0Vdc?

Replace

Replace R191

R190/Z190 and

and retest

retest.

F381,

Check F380, TVS,

V383 and L381.

V381 and L380

Check R191

Check R191,

and Z190.

is it OK?

Are they ok?

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Energy management calibration

During energy management calibration A/D-converter, BSI, Btemp, Battery voltage, Charger voltage and Charger current are calibrated.

Limits for calculated calibration values are as follows:

Channel Low High

ADC Offset -50 50

ADC Gain 26000 29500

BSI Gain 860 1180

Vbatt Offset 2400 2600

Vbatt Gain 10000 11000

Vchar 57000 63000

Ichar 3600 5000

ADC-offset over limits: Inspect BSI line and components in it (R385, Pull-up resistor R220). If these are OK, change UEM.

BSI Gain over limits: Inspect BSI line and components in it (R385, Pull-up resistor R220). If these are OK, change UEM.

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Vbatt offset and Gain: Inspect Vbatt lines and component in it.

Vchar over limits: Inspect components which are connected Vchar line: V383, F381 and L381

Ichar over limits: Inspect components which are connected at Vchar line. If those are OK, First change current sense resistor (R191), if calibration is not still successful change UEM.

Calibration can be checked using ADC-readings. Known voltages, currents and resistances are fed and read by ADC-readings, read values and known values can be compared.

ADC-reading

Divided and scaled battery voltage, Charger voltage, Charger current, BSI and Btemp values can be read by this tool. Read values few times before you can be sure that results are accurate.

NOTE: IF Vbatt Scaled and Divided unit results are different default calibration values are used. In this case perform EM-calibration to get full performance of phone.

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Maximum tolerances are:

Reading Check point Tolerance

Vbatt SCAL

Vchar 8.4V ± 40mV

Ichar 500mA ± 20mA

BSI 75k ± 1.3kohm

Btemp 273K(47k) ± 5K

4.2V ± 25mV

Backup battery

Symptom of backup battery fault is

Real Time Clock loses the correct time during short main battery removal.

The same symptom can also be seen when the backup battery is empty. About 30 minutes is needed to fully charge the backup battery in the device. NOTE: Backup battery is charged when the phone is powered or when the device is LOCAL or TEST mode.

Always check the backup battery visually for any leakage or any other visual defect.

Check that the backup battery is correctly mounted in the device before closing the cover.

Check with Phoenix that backup battery is OK

Measure the voltage of backup battery

• Normal operation when the voltage is > 2.0V

• Fully charged when the voltage is about 3.2V (because of large internal impedance voltage won’t stay above 3.0V a long time after charging is disabled)

Enable backup battery charging (start to charge main battery or boot device to LOCAL or TEST mode)

Measure voltage of backup battery during charging, It should arise if it is not 3.2V, yet.

When the voltage is over 2.0V for sure, check backup battery with Phoenix.

-> In not OK then D190 is faulty.

Ensure that the RTC is running.

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SIM card

The whole SIM interface locates in two chips UPP_WD2 and UEM. UEM contains the SIM interface logic level shifting. UPP provides SIMClk through UEM to the SIM. SIM interface supports both 3 V and 1.8 V SIMs.

UPP & UEM SIM connections

GND

UPP

SIM

C5 C6 C7

C1C2C3

BSI line from battery

SIMCLK

SIMRST

SIMDATA

VSIM

BSI

GND

UEM

SIMIF register

SIMIO SIMClk

Data

UEM digital logic

SIMIO

SIMClk

Data

UIF Block

UEMInt

CBusDa

CBusEnX

CBusClk

The SIM power up/down sequence is generated in the UEM. This means that the UEM generates the RST signal to the SIM. Also the SIMCardDet signal is connected to UEM. The card detection is taken from the BSI signal, which detects the removal of the battery. Monitoring of the BSI signal is done by a comparator inside UEM. The threshold voltage is calculated from the battery size specifications.

The SIM interface is powered up when the SIMCardDet signal indicates ”card in”. This signal is derived from the BSI signal. SW tries first to power up the SIM with 1.8 V. If this doesn't succeed power up is repeated with VSIM switched to 3 V.

The data communication between the card and the phone is asynchronous half duplex. The clock supplied to the card is in GSM system 1.083 MHz or 3.25 MHz. The data baudrate is SIM card clock frequency divided by 372 (by default), 64, 32 or 16.

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Figure 4: SIM Power Up.

Ch1 Vsim Ch2 Reset Ch3 Clock Ch4 I/O

Measured with 3Vsim

Figure 5: SIM answer to reset.

SIM answer to reset

CH1 = SIM_CLK CH2 = SIM_RST CH3 = SIM_I/O CH4 = SIM_PWR

Measure points SIM connector

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Figure 6: SIM Clk 3.25MHz.

SIM_Clk_3.25MHz

CH1 = SIM_CLK

Measure points SIM connector

Remember to check the two PHOENIX test cases before changing UPP!!!!

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"Insert SIM Card" in device display although card is inserted

START

Perform

SIM BB self tests.

Are they OK?

Yes

Perform

Phoenix SIM tests.

Are they OK?

Yes

Is the SIM

Detection Reliable?

Yes

Check & clean battery

centre contact. Verify BSI

signal has a steady voltage.

Replace UEM

Perform

BB SIM self tests.

Are they OK?

Yes

Check SIM connector

Is it OK?

Yes

Measure VSIM.

Is it 1.8/3.0V when SIM

interface is powered

up?

Yes

NoNo

Replace UPP_WD2

Check & clean connector

contacts & pads

Replace connector

Measure VSIM

resistance to GND.

Is it low?

Yes

Check C471/C488.

Check C471. Is it OK?

Are they ok?

Yes

NoNo

decouple C471/C488.

Change UEM

ange

Change VSIM

decouple,C471

Problem solved?

Yes

END

Analyse signals & look for

errors in rise / fall times due

to wrong fitted / faulty

passives

Check SIM Power Up sequencing. Is it OK?

Yes

Change SIM ASIP, R496

Check Clk, RST &

DATA at SIM connector.

Are the signals

present?

Yes

Check Clk,

RST & DATA between

UEM and the SIM ASIP.

Are the signals

present?

Yes

Change SIM ASIP, R496

Change UEM

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Audio troubleshooting

Figure 7: Audio routing window in Phoenix

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Microphone

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Earpiece

Check that holes are not coated.

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IHF

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Headset troubleshooting

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Memory troubleshooting

Most memory related errors are found through flashing the device, flashing the device is therefore recommended before any of the steps described in this chapter. Check flashing Troubleshooting section first.

There are however a few memory related errors that cannot be found through flashing.

• SDRAM(D312) partially damaged. This can mean that the SDRAM component itself is partially damaged and all the memory locations cannot be successfully read or there is a soldering problem somewhere either under UPP or SDRAM. There is a BB self test for testing SDRAM component quite thoroughly, but the problem is that if SDRAM doesn't function properly one may not be able to run those tests as SDRAM is used during the device boot and selftest cannot be run if the device hasn't booted.

• DEVICE may inform about being "out of memory " more often than it should

• flash1 (D310) or flash 2 (D313) is partially/totally damaged. During flashing the manufacturer, device and revision id's are read, but flashing is done based on id's of the flash0 (D311). This means that one cannot see any error messages displayed on Phoenix window during flashing if flash1 or flash 2 is failing. Id's are however displayed on the Phoenix window and successful read of flash1 id's can be checked from there.

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MMC troubleshooting

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USB troubleshooting

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VIBRA

There may be three kind of problems concerning vibra; it doesn't rotate at all, it's noisy or it's continuously on. The noisiness is usually caused by the surrounding mechanics when the rotating mass has contact to it.

Vibra

Malfunction

Change UEM

Vibra doesn’t rotate

Yes

Is the Vibra jammed

or its contact pads

Measure that C134 is

pulsed down to zero

while Vibra is switched

Yes

worn

on.

Vibra is continuously

Vibra is noisy

Check the

surrounding

mechanics of

the Vibra

Is it Vibra

component itself

that makes

noise?

Yes

Check C134, C135,

V132 and V131

Change the Vibra

and retest.

Vibra works

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ZOCUS

Read phone current

consumption

in Phoenix

OK?

Check N301

and other

components

SW Error Reflash

Replace damaged

components and retest

component

UI Troubleshooting

UI troubleshooting cases

This document describes how the trouble shooting should be done if there is something wrong with the UI function. If the problem is due to the display or keymat PWB the whole UI module should be replaced. However, the earpiece maybe replaced. (see Audio Troubleshooting)

Replace

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Keymat backlight

If the keymat backlight is non-functional and the backlight driver voltage is generated correctly, then there is either a problem with the connector or the UI module.

Note: that it is possible for an LED to be non-functional and for all other LEDs to still be working.

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Keyboard

If keyboard doesn’t work, follow the troubleshooting flow chart below:

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Display blank

Replace

Display

Check test points

J113, J114,

J185-J191

Display ok

OK?

Change

UPPWD2

Change V101

Z130

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Backlight does not turn on

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FM Radio Troubleshooting

FM radio component layout

Figure 8: Component placement

Figure 9: Trace layout.

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Figure 10: FM radio block layout.

Components C001 and C002 are not shown in the picture. Those components are placed near audio connector X002.

Figure 11: FM Radio control window.

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FM radio troubleshooting diagram

Notes to "FM Radio Troubleshooting diagram"

Use 1MHz 1X probe when measuring Audio and clock signals with oscilloscope.

Use active RF probe when measuring frequencies with spectrum analyzer.

Note 1. RF test signal parameters:

• Amplitude, A, –67.0 dBm

• Carrier frequency, f

•Deviation,

• Modulating frequency fm, 1,000 kHz (RF generator internal)

• FM stereo, mode R=L, pilot state ON

∆

f, 75 kHz

, 98,000 MHz

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Figure 12: FM radio troubleshooting diagram

Set phone into local mode.

Start FM radio.

Does

the radio

start ?

YES

Connect RF test signal (note1) Set radio channel to 98.0 MHz

Set radio volume to max.

Measure

Audio signal

C017 and

from C162 and

C018

C163.

Is it 1kHz

0.5–0.8Vp–p?

Check

516, C519

C107, C108,

C501, C502, C001

C109, C117 ,

L105,C367,C378,

C002, L500, L503

C379, L358.

Measure signal

C017, C018

from C162, C163

Is it 1kHz

0.5–0.8 Vp–p?

Check

R503, R504, V500

R359,R360,

V356, V357,

V501 , L501, L502

L356,L357,C357,

C512, C513, C511

C358,C362.

Measure

signal from

J103, J104,

OK ?

Change

500

N356.

Measure signal

from J103 and J104.

Is it

OK ?

Check

NO NO

YES

C374, C375, R375, R358 and measure

32kHz clock signal

from J359,

retest starting.

Start OK ?

Check

005, C006, R028

R164,

R165, R166,

R029, L002, L003

R167, L103,L104

Measure

signal from J103

and J104.

Is it

0.015–0.3 Vp–p?

L511

YES

OK, RETEST IN FLALI

YES

Measure

voltages from

pins 7 and 34,

is it –2.7 V ? Retest starting. Start OK now ?

Radio and RF generator

R503, R504, V500, V501

L357, C357, C358, C362,

L501, L502, C512, C513, C511

Set

to 87.5 and 108.0 MHz.

Measure Audio from

017, C018

C162 and C163.

Are both cases

1 kHz 0.5 – 0.8 Vp–p ?

Check

V356, V357, L356,

R359, R360.

T est again with

87.5 and 108.0 MHz. Measure audio from

C017, C018

C162 and C163.

Both OK?

Change

500

V356 and 357.

BOTH !

Retest with

87.5 and 108.0 MHz. Measure audio from

017, C018

C162 and C163.

Both OK ?

Check

N500

N356 solders

(pins 5,6,7,8,9,11,

12,13,17,33,34,35,

36, 37.

Start OK

now ?

YESYES

Baseband digital

YES

Change

500

N356.

Radio start

now?

fault (UPP)

YES

Audio

Amplifier

failure

(N150)

Change

radio module TB4

OK, RETEST IN FLALI

E Nokia Corporation

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Diagrams of FM radio signals

Figure 13: Oscilloscope screen shot, Audio output

Signal 1: Audio output from PWB test points J103 and J104, with FM test signal, volume 100%. Signal 2: Audio output from FM radio pins 22 and 23(same as in C017 and C018), with FM test signal

Figure 14: FM radio clock from L511, 32 kHz frequency clock signal, when radio is on.

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Figure 15: FM frequency from FM radio pin 37, the other end of L500, with FM test signal

15:51:49 03 JUL 2002

PEAK LOG

10 dB/

#AT 0 dBREF -20.0 dBm

MKR 97.9280 MHz

-71.03 dBm

SWEEP

CONT SGL FREE RUN

VIDEO

LINE

WA SB

CORR

SC FS

CENTER 98.0000 MHz SPAN 300.0 kHz

#RES BW 10 kHz VBW 10 kHz #SWP 1.00 sec

EXTERNAL

SYNC CRD

TV TRIG

Figure 16: VCO frequency from FM radio pins 3 and 4, the other ends of V500 and V501, with FM test signal

10:46:24 03 JUL 2002

PEAK LOG

10 dB/

WA SB

CORR

SC FS

#AT 10 dBREF .0 dBm

MKR

196.440 MHz

-9.40 dB

MEAS UNCAL

SWEEP

CONT SGL FREE RUN

VIDEO

LINE

EXTERNAL

SYNC CRD

CENTER 196.450 MHz SPAN 1.000 MHz

#RES BW 10 kHz #VBW 10 kHz #SWP 20.0 msec

TV TRIG

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RF Troubleshooting

Abbreviations in fault finding charts

BB Base band

DCS/PCN GSM1800

PCS GSM1900

EGSM Extended GSM900

ESD Electro Static Discharge

GPRS General Packed Radio Service

HSCSD High Speed Circuit Switched Data

LO Local Oscillator

PA Power Amplifier

PWB Printed Wired Board

PLL Phase Locked Loop

RF Radio Frequency

RX Receiver

SA Spectrum analyzer

TX Transmitter

UHF Ultra High Frequency

VCO Voltage controlled oscillator

VHF Very High Frequency

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Introduction

Two types of measurements have to be done for repair of the phone boards:

• RF measurements shall be done using a Spectrum Analyzer together with a highfrequency probe. (Note, that signal will be significantly attenuated). Correct attenuation can be checked by using a “good” phone board, for example.

• LF (Low frequency) and DC measurements shall be done with a an oscilloscope together with an 10:1 probe.

Always make sure that the measurement set-up is calibrated when measuring RF parameters at the RF connector. Remember to include the correct losses in the module repair jig and the connecting cable when realigning the phone.

Most RF semiconductors are static discharge sensitive. ESD protection must be taken into account during repair (ground straps and ESD soldering irons).

Mjoelner RF ASIC is moisture sensitive. Therefore, Mjoelner RF ASIC must be pre-baked prior to soldering.

Rx calibration done via Phoenix software is temperature sensitive because of calibration of 26 MHz reference oscillator (VCXO). According to Mjoelner specification

ambient temperature has to be in a range from 22°C to 36°C.

Apart from key-components described in this document there are a lot of discrete components (resistors, inductors and capacitors) for which Troubleshooting is done by checking if soldering of the component is done properly and checking if the component is missing from PWB. Capacitors can be checked for short-circuiting and resistors for value by means of an ohm-meter, but be aware in-circuit measurements should be evaluated carefully.

In the following both, the name EGSM and EGSM900 will be used for the low band. DCS or PCN and GSM1800 will be used for the mid band. PCS and GSM1900 will be used for the high band.

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RF key component placement

Figure 17: RF key component placement

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Reference number

N601 Mjoelner RF ASIC X602 RF Connector

B601 26 MHz Xtal L801 Directional Coupler

Z602 GSM1800 RX SAW V801 Detector Diode

Z603 GSM1900 RX SAW Z601 Antenna switch

Z604 EGSM RX SAW filter N801 Power Amplifier

Z701 EGSM TX SAW filter

T701 GSM1800/GSM1900 TX Balun

V802 EGSM Pre-amplifier

G701 3.7 GHz VCO

T702 VCO Balun

Name

Reference number

Name

RF measurement points

RF supply points

Figure 18: RF Supply points inside Mjoelner can

RF power supplies are generated in the UEM and can be measured either in the Mjoelner can or in the baseband can. Arrows mark the measurement points inside the pictures.

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Measurement points in the receiver

Measurement points are indicated on the picture below.

Figure 19: Rx I and Q measurement points

Figure 20: Rx measurement points at Rx SAW filters and Mjoelner RF ASIC

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Measurement points in the transmitter

Measurement points are shown in the picture below,

Figure 21: Tx measurement points inside PA can (bottom side of PWB)

Figure 22: Tx measurement points on the top side of PWB

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Figure 23: Tx measurement points inside Mjoelner can

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RF in General

The RF part is a triple-band direct conversion transceiver. Using direct conversion no intermediate frequencies are used for up- or down- conversion.

The VCO is set to either twice or four times (depending on the band used) the wanted RX or TX frequency. The VCO frequency is divided by either 2 or 4 and fed to the mixers (down-conversion) or modulators (up-conversion). Up- or down- conversion is done in one step, directly between RF frequency and DC. All up and down-conversion takes place in the RF ASIC named Mjoelner (N601).

Mjoelner RF ASIC also contains PLL and LNAs for all used bands. A DC control section is included in to power and/or control EGSM TX buffer, detector and antenna switch. The Mjoelner RF ASIC is controlled via a serial bus.

Mjoelner RF ASIC contains an integrated VCXO which uses an external 26 MHz Xtal. No analogue AFC signal is needed. AFC is done via the serial interface of Mjoelner.

The interface between Mjoelner RF ASIC, UPP and Bluetooth uses a 26 MHz reference clock. An external 26 MHz reference clock buffer is used to drive Bluetooth module.

The RF supports HSCSD (High Speed Circuit Switched Data) and GPRS (General Packed Radio Service), meaning multi-slot operation, this will not require special equipment or procedures in repair situations.

Figure 24: RF frequency plan

Mjoelner

EGSM: 925-960 MHz

DCS: 18 05 - 1880 MHz

PCS: 1930-1990 MHz

f/4

f/2

34203980 MHz

f/2

I-signal Q-signal

PLL

26 MHz

DCS: 17 10 - 1785 MHz

PCS: 1850-1910 MHz

EGSM: 880-915 MHz

1/1 1/2

XTal

LPRFCLK

RFCLK I-signal Q-signal

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VR5

VR1A

VPLL

Vcp

PLL

filter

Synth

supply

CPOUT

VDDCP

VDDPLL

VDDLO

VDDPRE

Pump

Charge

VRX

VR4

RXIP

RXIM

BIQUAD

RXQP

RXQM

DCN2

LPF2

AGC

DCN2

LPF2

BIQUAD

AGC

filter

supply

DCN1

LPF1

BBAMP

DCN1

ADIV

NDIV

LPF1

BBAMP

64/65

Mjoelner

VR3

filter

VCXO

supply

REFOUT

LPR

loop

filter

VDDXO

REFOUT

VDDBBB

Lock

1/2

Detect

Buf/

AGC

RDIV

LOCNT

REFCNT

VR7

VR2

VIO

GENIO6

VIO

filter

VCO

supply

CLK

buffer

26MHz

INPLO

XTALP

INMLO

XTALM

Buffer

R2H/R2

VCXO Bias

VBB (1.8V)

RESET_X

Ref clk set

RFBUSX

RFBUSDA

RFBUSCLK

VDDDL

VDDDIG

RESETX

Control

AFC/CAL

VDDTX

VDDRXBB

RF_EN

RF_CLK

RF_DATA

RESETX

SELADDR

shift

I/O level

VCOSENSE

Digital Control

Sensor

BIST / Temp.

Main Bias Circuit

Resistor Ext/R2H/R2

Rpa

SENSE

PA vendor

indication

2,7k

RBEXT

VBEXT

Ref.

VREF1

filter

RFCONV_0(9)

VDDRXBB

1/4

222

VR6

Pre-gain

LNA

Bias

LNA

INPL

INML

RX900

SAW

EGSM

Pre-gain

LNA

INPH

INMH

INPM

RX1900

SAW

PCN

PCS

Ant Switch

1/2

VDDDIG

LNA

INMM

RX1800

VANTL / VANTM / VANTH

1/4

1/2

VDDRXB

Controls

VB_DET

VTXLOH

VTXLOL

Controls

VTXBH

Open collector

VTXBL

OUTHP

OUTHM

Balun

PCN/PCS

Dir. Coupler

Open collector

DET

PLFB1

OUTLP

OUTLM

SAW

VTX

PW-

Buffer

EGSM

PWC

loop

DET

PLFB2

VDDTX

filter

Supply

TXC TXP

VPCH/VPCL

filter

PA_IDENT

TXIP/TXIM

TXQP/TXQM

VTX

VR2

TXC TXP

VBATTRF

Figure 25: RF Block diagram

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RF Power Supply Configuration

All power supplies for the RF Unit are generated in the UEM IC (D190). All RF supplies can be checked either in Mjoelner can or in BB can.

The power supply configuration used is shown in the block diagram below. Values of voltages are given as nominal outputs of UEM. Currents are typical values.

Figure 26: RF Power distribution diagram

UEM

VR1A

4.75V

4.7V)

VR2

(2.78V)

VREF01

(1.35V)

VR3

VR4

VR5

VR7

VIO

(1.8V)

VBAT

Charge Pump Supply : Vddcp(0.5mA)

TX Modulators(85mA), Bias :

Mjolner registers: Vdddig(10uA)

Mjoelner mixers: OUTXX (66mA)

VCXO Supply : Vddxo(2.7mA)

Vddrxf(7mA), Vddrxbb(30mA)

PLL Supplies : Vddpll(0.5mA), Vddlo

External VCO supply (13mA)

26MHz Buffer, logic : Vddbbb(0.7mA),

Bias Reference : VBEXT(-10uA)

Vddtx(8mA)

BT Buffer (1mA)

RX LNA, RX Mjoner BB :

+ Vddpre(36mA)

Vddl(1uA)

PA, Bluetoot h

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Receiver

General instructions for RX troubleshooting

Connect the phone to a PC with DAU-9S cable and dongle and follow the following instructions:

Measuring RX I/Q signals using RSSI reading

Start Phoenix Service Software

Select File [Alt-F]

Manage Connections [M]

FBUS Apply

Close window

Open the FBUS connection

Select Scan Product Ctrl-R

Wait until phone information shows in the lower right corner of the screen.

Set operating mode to local mode

Select Testing alt-S

RF Controls R

Wait until the RF Controls window pops up

Select Band GSM 900 or GMS 1800 or GSM 1900

Active unit RX

Operation mode Burst

RX/TX Channel 37 or 700 or 661

Select Testing alt-S

RSSI reading g

The setup should now look like this:

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Apply a signal with a frequency of

EGSM : 942.467 MHz (channel 37 + 67.710kHz offset)

GSM1800: 1842.867 MHz (channel 700 + 67.710kHz offset)

GSM1900: 1960.067 MHz (channel 661 + 67.710kHz offset)

and a power level of -80dBm to the RF-connector (remember to compensate for cable attenuation).

In RSSI reading click on Read now.

Measuring RX performance using SNR measurement

Start Phoenix Service Software

Open the FBUS connection

Select Scan Product Ctrl-R

Wait until phone information is shown in the lower right corner of the screen.

Set operating mode to local mode

Select Testing alt-S

RF Controls R

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Wait until the RF Controls window pops up

Select Band GSM 900 or GMS1800 or GSM1900

Active unit RX

Operation mode Burst

RX/TX Channel 37 or 700 or 661

Select Testing alt-S

SNR Measurement N

select Fast SNR Radio Button

The setup should now look like this:

Choose respective band (EGSM900, GSM1800, GSM1900).

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Press measure. A window pops up, e.g. for EGSM900 band:

Connect an external signal generator to the RF connector of the phone and set the generator as told in the window, taking care for external cable losses.

Press ok and the window closes.

Read the SNR result. SNR should be: EGM900 >20dB

GSM1800 >18dB

GSM1900 >18dB

Measuring frontend power levels using spectrum analyzer

Spectrum analyzer (SA) level values depend on the probe type and should be validated using a good sample.

The levels that are given here are measured using a resistive probe (50Ohm semi-rigid cable).

Start Phoenix Service Software

Open the FBUS connection

Select Scan Product Ctrl-R

Wait until phone information shows in the lower right corner of the screen.

Set operating mode to local mode

Select Testing alt-S

RF Controls S

Wait until the RF Controls window pops up

Select Band GSM 900 or GMS1800 or GSM1900

Active unit RX

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Operation mode Continuous

RX/TX Channel 37 or 700 or 661

Please refer to the fault finding chart for proper levels at different test points.

Measuring analogue RX I/Q signal voltages using oscilloscope

Measuring with an oscilloscope on “RXIINN” or “RXQINN” is recommended only if RSSI reading does not provide enough information. Use testpoints J606-J609. Input level = 80dBm

Start Phoenix Service Software

Select Scan Product Ctrl-R

Wait until phone information shows in the lower right corner of the screen.

Set operating mode to local mode

Select Testing alt-S

RF Controls R

Wait until the RF Controls window pops up

Select Band GSM 900 or GMS1800 or GSM1900

Active unit RX

Operation mode continuous

RX/TX Channel 37 or 700 or 661

AGC 14

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Following picture should be seen on a working EGSM receiver:

Signal amplitude 1.25V

DC offset 1,35V

Frequency 67kHz

Receiver fault finding

Set up Phoenix as if doing RSSI measurements.

Ascertain which Rx band is faulty.

Refer to Rx fault finding flow chart.

Set signal generator frequency to 942.47MHz for EGSM, 1842.87MHz for DCS 1800 or

1960.07MHz for PCS 1900.

Set signal generator amplitude to -60dBm.

Note:That checking the RF inputs to SAW filters Z602, Z603 & Z604 will be extremely difficult with the Mjoelner Can Shield in place. If this is impossible to get to, try checking the test points shown on the antenna switch Z601.

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Select Receive Band For Testing.

Check Antenna Switch Cont. lines. Do they match the results

in the table?

YES NO

Inspect RF Connector. OK?

YES NO

Replace Antenna Switch

Replace RF Connector

Check L701, L702 L703. OK?

YES

Check Antenna Switch Test Point. Signal OK?

YES

Check PI Filter & SAW Components. OK?

YES

Replace SAW Filter

Replace all 3 Components

Replace Inductor

KEY

Test With Spectrum Analyzer

Check SAW

Output / Mjoelner Input for band. OK?

Measure Vge at same point. 0.2V?

Inspect PI filter & SAW for S/c. S/C?

YES

Rectify S/C

Test With Oscilloscope

Refer to Synth. Flow Chart.

YES

Check Mjoelner Voltage Supplies & RFBUS lines. All OK?

Check RSSI using Phoenix. Does it match Sig. Gen Output level?

Is LO Running?

Probe J606-609 for RX I & Q

Does Waveform

YES

look like example?

YES

Probe J211 & J212. Is digital data visible?

YES

Replace Mjoelner

Inspect / Check

Refer to BB Fault Finding

End Action

YES

Replace UEMReplace UPP

Receiver is working correctly.

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Rx signal paths

The signal paths of the receiver are shown in following block diagram. Note that the picture shows EGSM900 (EGSM) receiver (top), GSM1900 (PCS) receiver (middle) and GSM1800 (DCS/PCN) receiver (down).

VR6

VD DR XF

LN Bias

SAW

GSM

Swi

tch

PCS

PCN

RX900

SAW

RX1900

SAW

RX1800

VANTL / VANTM / VANTH

INMH

INPM

INMM

INML

INPH

INPL

Controls

Antenna switch (RX/TX switch)

From the antenna-pad (X600) the RF signal is fed through the antenna connector (X602) to the RX/TX switch (Z601). The antenna connector represents a mechanical switch between internal antenna and external antenna feed.

Pregain

VDDDIG

VDDRXBB

222

1/2

supply

filter

XB B

BIQU

BBAMP

LPF1

BBAMP

LPF1

1/4

DCN1

LPF2

BIQU

LPF2

DCN2

VRX

VR4

RXIP RXIM

RXQP RXQM

VDDLO

Mjølne

The RX/TX switch (Z601) works as diplexer. EGSM900 input signals pass to GSM_Rx output. GSM1800 input signals pass to PCN_Rx output or PCS_Rx output, depending on the control signal VANTH (Cont2).

From RX1-GSM output of the antenna switch the RX signal is routed in the inner layers of the PWB to the EGSM900 SAW filter (Z604). From RX2-DCS output the GSM1800 RX signal is routed to the GSM1800 SAW filter (Z602). From RX3-PCS output the RX GSM1900 signal is routed to the GSM1900 SAW filter (Z603).

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The RX/TX switch with routed lines has following typical insertion losses:

1.3dB@EGSM900, 1.6dB@GSM1800 and 1.6dB@GFSM1900.

Figure 27: Antenna switch Rx test points

Front-end

The RX front end includes three SAW filters (EGSM900 (Z604), GSM1800 (Z602), GSM1900 (Z603)). Each of the SAW filters is matched with a differential matching circuit (LC-type) to the corresponding LNA input of Mjoelner RF ASIC (N601). The SAW filters provide out-of-band blocking immunity, the integrated LNAs provide the front-end gains. Each of the SAW filters has a single-ended input and a balanced output which provides a balanced RX signal to the corresponding input of the Mjoelner RF ASIC.

The SAW filters have maximum insertion losses of

3.5dB@EGSM900, 4.0dB@GSM1800 and 4.0dB@GSM1900.

RX paths of Mjoelner RF ASIC

The balanced RX signal is amplified by the integrated LNA and the subsequent Pre-Gain stage. After amplification the RX signal is down-converted with a LO signal coming from the local oscillator.

The RX paths of Mjoelner RF ASIC consist of following building blocks:

• Separate LNAs for each of the three bands: EGSM900, GSM1800 and GSM1900.

• Two PREGAIN amplifiers, one for EGSM900 and one common for GSM1800 and GSM1900.

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• Two passive I/Q mixers (MIX), one for EGSM900 and one common for GSM1800 and GSM1900.

The resulting BB signal is further amplified in the BB chain. For that no external circuitry is required:

• Base band amplifiers (BBAMP1). That amplifiers implement the initial channel filtering.

• Low pass filters (LPF1).

• DC compensation / AGC amplifiers (DCN1). They implement gain steps from 0dB to 24dB in 6dB steps.

• Attenuators (AGC). They implement gain steps from -48dB to 0dB in 6dB steps, yielding a total gain range of 72dB together with DCN1.

• Bi-quad filters (LPF2).

• DC compensation amplifiers (DCN2).

The differential base band outputs are internally DC coupled and can be connected directly to the ADC inputs of the RF converter chip. The common mode level is set equal to the VBEXT reference voltage.

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Transmitter

General instructions for EGSM TX troubleshooting

Apply a RF-cable to the RF-connector to allow the transmitted signal to act as normal. RF-cable should be connected to measurement equipment (GSM Test equipment, Powermeter, Spectrum Analyzer, or similar). Be sure to use at least a 10-dB attenuator, otherwise the results may be incorrect.

Connect the phone to a PC with DAU-9S cable and dongle and follow the following instructions:

Set the mode switch to ‘Local’ and connect the phone to a power supply (3.6V). When using an MJS-80 module jig, a 4.2V supply is needed.

Open Phoenix and log in with your user ID.

Select File [Alt-F] -> Manage Connections [M] -> FBUS -> Apply -> Close window.

Select File -> Scan Product [Ctrl-R].

When the product has been found, the phone SW version can be read from the lower edge of the Phoenix screen.

If the Operation is not shown, click Read button to see that Local mode has been selected. Select Testing [Alt-S] -> RF controls [R].

Before choosing the band and Tx as Active Unit, and if the spectrum analyser is used, make sure that the spectrum analyser reference level is higher than the expected TX power.

Use the automatically selected channel.

Set Operation Mode to ‘Burst’.

Choose the Power level you want the phone to operate at.

Set spectrum analyzer centre frequency, 897.4MHz for EGSM, 1747.8MHz for PCN 1800 & 1880MHz PCS 1900 and set Span to 1MHz.

Set Amplitude of spectrum analyzer reference level to one that you can clearly see the transmit pulse according to the kind of test probe you are using.

Diagnose as per fault finding flow chart.

Note:Be careful when selecting the operation mode, if ‘Continuous’ is selected prolonged transmission may damage the phone.

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Figure 28: Mjoelner Can Tx Test Points

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TX Analog I & Q Data, C715 & C716

TXP

TXC

TXP & TXC Lines during Transmission

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TXP / TXC Mask

TXP

TXC

Power Control Loop On

Baseband Generated Reference for EGSM Power Level 19

Figure 29: EGSM TX Can Test Points

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VTXB_900 (EGSM V802 Pre-Amp Biasing Waveform)

Only Biases V802 for duration of TX Pulse.

EGSM Transmit Waveform (Burst, Power Level 19)

Phone drew 140mA during Burst operation

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EGSM Transmit Waveform (Continuous, Power Level 19)

**Was drawing over 600mA during continuous operation**

TX path of the transmitted EGSM900 signal

For easy error tracing it is important to know the signal path of the EGSM900 transmitter. The components can be grouped into blocks and drawn as shown below. Note that the following picture shows both EGSM900 transmitter (bottom) and GSM1800/ GSM1900 transmitter (top).

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VANTL / VANTM / VANTH

VB_DET

VTXLOL VTXLOH

VTXBH VTXBL

PCN/PCS

GSM

PCN

Ant Switch

PCS

Dir. Coupler

Buffer

EGSM

DET

PA_IDENT

VBATTRF

VTX

Balun

SAW

PWloop filter

OUTHP OUTHM

OUTLP OUTLM

DET PLFB1 PLFB2

VPCH/VPCL

Controls

Open collector

PWC

TXP

VDDDIG

VDDRXBB

1/2

1/4

Mjølner

TXC

TXP

TXC

VDDTX

Supply

filter

VTX

VR2

TXQP/TXQM

TXIP/TXIM

EGSM900 TX path of Mjoelner RF ASIC

The balanced TX IQ signal is provided by the base band and is coming to the Mjoelner RF ASIC. The TX paths of the Mjoelner RF ASIC include mainly two RF modulators for upconversion of the base band signals, one for EGSM900 and one common for GSM1800/ GSM1900. The base band signal is modulated with the LO signal corresponding to the wanted TX channel. The GSM TX output of the Mjoelner RF ASIC is a balanced signal.

From the output of the Mjoelner RFASIC the signal is fed through the EGSM TX SAW filter (balanced to single-ended), a 900MHz buffer, and a 5-db pad to the PA EGSM input.

EGSM900 TX path of the Power Amplifier (PA)

The PA EGSM900 part has a maximum output power of app. 35dBm. Voltage supply is coming directly from the Battery connectors.

The EGSM900 output is controlled by the power control loop. From the EGSM900 output of the PA the RF signal is fed through the directional coupler (one of the power control loop components) to the antenna switch.

Antenna switch (TX/RX switch)

The antenna Switch works as a diplexer for the RX and TX signals. Moreover, it suppresses the TX harmonics generated by the PA. The antenna switch is controlled by the Mjoelner RF ASIC using the control signals CONT1, CONT2 and CONT3. The following

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table shows the possible different states.

CONT1 [Volt]

0 0 0 X

0 0 2.7 X

0 2.7 0 X

2.7 0 0 X

CONT2 [Volt]

CONT3 [Volt]

EGSM Rx

Figure 30: Antenna Switch Test Points

DCS Rx PCS Rx EGSM Tx

DCS/PCS Tx

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Antenna Switch Control Line (CONT3) During EGSM Transmission

Antenna Switch Control Line During EGSM Transmission

EGSM Tx fault finding flow chart

THE FIRST FLOW DIAGRAM ASSUMES THE FOLLOWING:

Transmit Timing

TXIOUTP

TXC

VTXB_900

Antenna Switch CONT 3

• Phoenix has been set up as shown on page 24 (the Tx power level may be increased using Phoenix if it makes the Tx pulse easier to see).

• Relevant components have been visually inspected for orientation, placement, etc.

• The transmit signal has been checked with a spectrum analyzer at RF connector, X602 and was found to be too low or non-existent.

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• The VCO is running correctly.

• The power amplifier is getting a correct VBATRF supply via L805 & L809.

• Mjoelner’s supply voltages VR1A, VR2, VR3, VR4, VR5 & VR7 are all working correctly.

Change L801

Is Signal at Antenna pin of Z601 ok?

Change X602 RF Connector

YES

Change Antenna Switch

Is Signal at TX_GSM on L801 OK?

YES

Check Antenna Switch Control Lines. Do they match the results in the table?

Check L701, L702 & L703. OK?

Replace Inductors

Is Signal at C834 OK?

YES

Probe VPD_900Signal on R818 and set Power Level to 19 using Phoenix. Is Pulse Pk-Pk 2.8V?

YES

KEY

Test using Spectrum Analyzer

START

YESYESNO NO NO

Is EGSM

TXIN signal

at R805 OK?

R 806

YES

Is Signal at V802 Collector OK?

Is VTXB _900 OK?

Is Signal at C733 OK?

Is signal at L807 OK?

YES NO

YES

Are TX I & Q on C715 & C716. OK?

YES

Are TXP & TXC visible?

YES

NO TXP

Is VR2

2.8V on C731?

NO YES

NO TXC

Replace PA

Check / Replace R805, C820, C821

R 806

Test using Oscilloscope

Check Z701 & Biasing components

Check V802 & associated components

Check / Inspect

End Action

Change Mjoelner

Change UEM?

Are digital I & Q

OK?

signals OK on J123 & J214?

YES

Change UPP

Change UEM

General instructions for GSM1800/1900 TX Troubleshooting

Apply an RF-cable to the RF-connector to allow the transmitted signal to act as normal. RF-cable should be connected to measurement equipment (GSM Test equipment, Powermeter, Spectrum Analyzer, or similar).

DCS 1800/PCS 1900 Tx fault finding flow chart

The following diagram assumes the following:

• Phoenix has been set up as shown previously (selecting DCS 1800 in the RF control box).

• Relevant components have been visually inspected for orientation, placement etc.

• The Transmit Signal has been checked with a Spectrum Analyzer at the RF connector, X602 and was found to be low or non-existent.

• The VCO is running correctly.

• The Power Amplifier is getting a correct VBATRF supply via L805 & L809.

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• Mjoelner’s supply voltages VR1A, VR2, VR3, VR4, VR5 & VR7 are all working correctly.

Path of the transmitted GSM1800/1900 signal

For easy error tracking it is important to know the signal path of the GSM1800/ GSM1900 transmitter. The components can be grouped into blocks and drawn as shown below. Note that the picture shows both EGSM transmitter (bottom) and GSM1800/ GSM1900 transmitter (top).

VANTL / VANTM / VANTH

VB_DET

VTXLOL VTXLOH

VTXBH VTXBL

PCN/PCS

GSM

PCN

Ant Switch

PCS

Dir. Coupler

VTX

Buffer

EGSM

DET

PA_IDENT

VBATTRF

Balun

SAW

PWloop filter

OUTHP OUTHM

OUTLP OUTLM

DET PLFB1 PLFB2

VPCH/VPCL

Controls

Open collector

PWC

TXP

TXC

VDDDIG

VDDRXBB

VDDTX

Supply

filter

VTX

VR2

1/2

1/4

Mjølner

TXQP/TXQM

TXIP/TXIM

The path of Mjoelner RF ASIC

The balanced TX IQ signal from base band is coming to Mjoelner RF ASIC. The GSM1900 path includes an common RF modulator for GSM1800 and GSM1900. The BB signal is up-converted with the LO signal corresponding to the wanted TX channel. The GSM1800/ GSM1900 TX output of Mjoelner is a balanced signal.

From the output of Mjoelner the signal is fed through the Balun T701 (Balanced to single ended) and an 3 dB pad to the PA GSM1800/1900 input.

The path of the PA

The GSM1800/GSM1900 part of the PA has a maximum output of app. 33dBm. The sup-

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ply is coming directly from the Battery connectors.

The output is controlled by the power control loop. From the output of the PA the signal goes through the directional coupler (one of the power control loop components) to the Antenna Switch.

Antenna Switch

The Antenna Switch works as a diplexer between RX and TX Bands. Moreover, it partly suppresses the harmonics generated by the PA. Mjoelner RF ASIC controls the antenna switch by three voltages CONT1, CONT2 and CONT3. The following table shows the different states.

CONT1 [Volt]

0 0 0 X

0 0 2.7 X

0 2.7 0 X

2.7 0 0 X

CONT2 [Volt]

CONT3 [Volt]

EGSM Rx DCS Rx PCS Rx EGSM Tx

DCS/PCS Tx

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Fault finding chart for GSM1800/GSM1900 transmitter

Is signal at DCS / PCS Input of Z601 OK?

Replace L801

Are Z601 Control lines as per table?

YES

Check RF Connector X602. OK?

Replace RF Connector.

NOYES

YES

Is signal on C823 OK?

Is VPD_1800 signal OK?

Investigate Mjoelner

Replace Antenna Switch

KEY

Test With Spectrum Analyzer

Test With Oscilloscope

YES

Replace PA

START

Is TX Signal at

DCS / PCS In on

R819 OK?

YES

Are TXP & TXC OK?

TXC U/S

Change UEM

Change UPP

Check / Inspect

NOYES

TXP U/S

End Action

Is TX Signal at L705 OK?

Are TX I & Q Signals OK?

YES

Are Digital

Change UEM.

I & Q Signals OK at J213 &

OK?

J214

NO YES

YES

Is Vr2 2.8V on R720?

NO YES

Refer To Baseband Fault Finding

Check T701 & Associated Components.

If the Tx output is too high, then it is most likely that there is a problem within the Power Control loop.

Mjoelner is receiving the Reference TXC from Baseband and not getting any feedback from DET to compare with TXC. The result is that Mjoelner drives VDP_900/VPD_1800 high to try and increase the power output so that the DET signal is matching TXC. With a break in the Power Control loop, the DET signal never reaches Mjoelner so it assumes that the PA is not outputting enough power so it tries to compensate by increasing the gain.

When checking the Power Control loop, make sure that (C803) is pulsing at 2.8V Peak to Peak. Check the DET pulse at Mjoelner input on R706.

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This case is the same for EGSM, DCS1800 & DCS1900.

NO YES

Replace Faulty Components

Are R706, R707 & R708 OK?

Eunsure that VBD is pulsing 2.8V Pk - PK and investigate Mjoelner

KEY

Test With Spectrum Analyzer

Is DET Pulse on C805 OK?

Test With Oscilloscope

Replace V801

Check / Inspect

NOYES

End Action

Is RF Signal at V801 OK?

YES

Is DET Pulse on C804 OK?

YES

Replace L801

Replace R802

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NEM-4 Synthesizer

There is only one PLL synthesizer generating frequencies for both Rx and Tx for all three bands (EGSM900, GSM1800 and GSM1900). VCO frequency is divided by 2 or by 4 in Mjoelner depending on which band is active.

General instructions for synthesizer troubleshooting

Connect the phone to a PC with DAU-9P cable and dongle and follow these instructions:

Start Phoenix Service Software (dongle needed):

Open FBUS connection

Select Scan Product Ctrl-R

or File Alt-F

Scan Product P

Wait until phone information shows in the lower right corner of the screen.

Set operating mode to local mode.

Start RF Control window:

Select Testing Alt-S

RF Controls R

Wait until the RF Controls window pops up

Set the synthesizer to the following mode:

Select Band GSM 900

Active unit RX

Operation mode Continuous

RX/TX Channel 37

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The setup should now look like this:

Since VCO chamber is completely shielded, it is not easy to measure frequency of

3769.6MHz at the output of the VCO (G701) using a resistive probe and a spectrum analyzer. It is possible to measure tuning voltage at charge pump output (C710) easily. For f

= 3769.6MHz the tuning voltage should be 2.3VDC .. 2.8VDC (Tuning sensitivity of

VCO

VCO is 240MHz/V typ.).

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Figure 31: PLL Synthesizer Test Points

If this is not the case, then go to Fault finding chart in this document for Troubleshooting.

Figure 32: Mjoelner Can Test Points

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26 MHz reference oscillator (VCXO)

The 26 MHz reference oscillator (VCXO) is part of Mjoelner RF-ASIC (N601). It needs only an external 26 MHz Xtal (B601) as external circuitry.

The reference oscillator has three functions:

• Reference frequency for the PLL synthesizer.

• System clock for BB (RFCLK_I = 26 MHz).

• 26 MHz Reference clock (LPRFCLK_I) for Bluetooth Module (N430) via buffer V601.

For an error free initial synchronization, the 26MHz frequency of the VCXO must be accurate enough. Therefore, a VCXO-calibration (cal) value is written via the serial Bus into the RefOSCCAL register of Mjoelner and an additional bit in the RefOSCCntl register of the Mjoelner. That is necessary for the rough calibration of the VCXO.

The VCXO is fine tuned by programming the AFC value via the serial bus of Mjoelner. The necessary AFC value is written into the RefOSCAFC register in Mjoelner.

VCO

The VCO is able to generate frequencies in the range from 3420MHz to 3980MHz when PLL is in function. The frequency of the VCO signal is divided by 2 or by 4 in Mjoelner RFASIC. So it is possible to generate the frequency of all channels in EGSM900, GSM1800 and GSM1900 (both RX and TX). Frequency of the VCO is controlled by DC voltage (Vc) coming from the PLL loop filter. Range of Vc when PLL is in function is 0.7V– 3.8V. Typical tuning sensitivity of the VCO is 240MHz/V. Even if PLL is not working (Vc out of range) there is a frequency at the output of the VCO, which is between 3 and 4 GHz (if the VCO itself is ok).

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Fault finding chart for PLL synthesizer

Set up Phoenix RF Controls

Band: GSM 900 Mode: RX Continuous Channel: 37

Check T702 Balanced O/P. Signal same?

YES NO

Change Channel to 975. Does LO change frequency?

YES

Check T702 I/P.

LO Present?

YES NO

Change T702

PLL is working

Is LO@

3.77 GHz

Change

R731

START

YES

Check VCO Out. Is LO visible?

YES

YES NO

Does the VC Vge change when you change channels?

YES

Check Loop Filter Components. OK?

KEY

Test with Spectrum Analyzer

NOYES

Check Mjoelner Voltage Supplies VR1A, VIO, VR3, VREF1. OK?

Test with Oscilloscope

Check VR7 VCO Side of R730. Vge OK?

Replace G701

YES

Replace Mjoelner

Replace Faulty Loop Filter Components

Check / Inspect

Refer to BB Fault Finding

End Action

Check VR7 J618. Vge OK?

YES

Change R730

It is important to say that power supply for VCXO ( VR3) is only switched ‘OFF’ in the socalled ‘Deep Sleep Mode’ and power supply for VCO (G701 VR7) is switched ‘OFF’ in socalled ‘Sleep Mode’.

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PLL block diagram

VR5

VR1A

VPLL

Vcp

filter

Synth

supply

VDDLO

VDDPRE

VDDPLL

supply

VDDCP

Charge

PLL

loop

CPOUT

Pump

NDIV

ADIV

64/65

VR3

filter

supply

VCXO

REFOUT

LPR

CLK

buffer

filter

VDDXO

REFOUT

VDDBBB

XTALM

Buffer

Lock

Detect

LOCNT

1/2

Buf/

AGC

RDIV

REFCNT

VCXO Bias

VR7

filter

VCO

supply

26MHz

INPLO

INMLO

XTALP

RESETX

R2H/R2

VIO

VBB (1.8V)

VDDDL

VDDTX

VDDRXBB

Ref clk set

SELADDR

GENIO6

RFBUSX

RFBUSDA

RESET_X

RESETX

I/O level

Digital Co ntrol

Sensor

RFBUSCLK

RF BUS CLK

RF BUS ENI

RF BUS DA

RF_EN

RF_CLK

RF_DATA

RF BUS CLK

RF BUS ENX

RF BUS DA

shift

VCOSENSE

BIST / Temp.

SENSE

RBEXT

Rpa

PA vendor

3.3n

2,7k

indication

VR2

VDDDIG

Control

AFC/CAL

Main Bias Circuit

Resistor Ext/R2H/R2

VDDRXBB

mixer

To GSM RX

2 2 2 2

RX mixer

To DCS/PCS

1/2 1/4

To GSM

Modulator

2 2 2 2

Modulator

To DCS/PCS

VBEXT

Ref.

filter

VREF1

RFCONV_0(9)

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PLL power supply

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Loop filter

VCO and power supply

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26MHz Bluetooth buffer

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Frequency lists

EGSM900

CH TX RX VCO TX VCO RX CH TX RX VCO TX VCO RX CH TX RX VCO TX VCO RX

975 880.2 925.2 3520.8 3700.8 1 890.2 935.2 3560.8 3740.8 63 902.6 947.6 3610.4 3790.4 976 880.4 925.4 3521.6 3701.6 2 890.4 935.4 3561.6 3741.6 64 902.8 947.8 3611.2 3791.2 977 880.6 925.6 3522.4 3702.4 3 890.6 935.6 3562.4 3742.4 65 903.0 948.0 3612.0 3792.0 978 880.8 925.8 3523.2 3703.2 4 890.8 935.8 3563.2 3743.2 66 903.2 948.2 3612.8 3792.8 979 881.0 926.0 3524.0 3704.0 5 891.0 936.0 3564.0 3744.0 67 903.4 948.4 3613.6 3793.6 980 881.2 926.2 3524.8 3704.8 6 891.2 936.2 3564.8 3744.8 68 903.6 948.6 3614.4 3794.4 981 881.4 926.4 3525.6 3705.6 7 891.4 936.4 3565.6 3745.6 69 903.8 948.8 3615.2 3795.2 982 881.6 926.6 3526.4 3706.4 8 891.6 936.6 3566.4 3746.4 70 904.0 949.0 3616.0 3796.0 983 881.8 926.8 3527.2 3707.2 9 891.8 936.8 3567.2 3747.2 71 904.2 949.2 3616.8 3796.8 984 882.0 927.0 3528.0 3708.0 10 892.0 937.0 3568.0 3748.0 72 904.4 949.4 3617.6 3797.6 985 882.2 927.2 3528.8 3708.8 11 892.2 937.2 3568.8 3748.8 73 904.6 949.6 3618.4 3798.4 986 882.4 927.4 3529.6 3709.6 12 892.4 937.4 3569.6 3749.6 74 904.8 949.8 3619.2 3799.2 987 882.6 927.6 3530.4 3710.4 13 892.6 937.6 3570.4 3750.4 75 905.0 950.0 3620.0 3800.0 988 882.8 927.8 3531.2 3711.2 14 892.8 937.8 3571.2 3751.2 76 905.2 950.2 3620.8 3800.8 989 883.0 928.0 3532.0 3712.0 15 893.0 938.0 3572.0 3752.0 77 905.4 950.4 3621.6 3801.6 990 883.2 928.2 3532.8 3712.8 16 893.2 938.2 3572.8 3752.8 78 905.6 950.6 3622.4 3802.4 991 883.4 928.4 3533.6 3713.6 17 893.4 938.4 3573.6 3753.6 79 905.8 950.8 3623.2 3803.2 992 883.6 928.6 3534.4 3714.4 18 893.6 938.6 3574.4 3754.4 80 906.0 951.0 3624.0 3804.0 993 883.8 928.8 3535.2 3715.2 19 893.8 938.8 3575.2 3755.2 81 906.2 951.2 3624.8 3804.8 994 884.0 929.0 3536.0 3716.0 20 894.0 939.0 3576.0 3756.0 82 906.4 951.4 3625.6 3805.6 995 884.2 929.2 3536.8 3716.8 21 894.2 939.2 3576.8 3756.8 83 906.6 951.6 3626.4 3806.4 996 884.4 929.4 3537.6 3717.6 22 894.4 939.4 3577.6 3757.6 84 906.8 951.8 3627.2 3807.2 997 884.6 929.6 3538.4 3718.4 23 894.6 939.6 3578.4 3758.4 85 907.0 952.0 3628.0 3808.0 998 884.8 929.8 3539.2 3719.2 24 894.8 939.8 3579.2 3759.2 86 907.2 952.2 3628.8 3808.8

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Company Confidential

Nokia N-Gage Service Manual 06 nem 4 troubleshooting

Specifications and Main Features

Frequently Asked Questions

User Manual

6 - Troubleshooting Instructions

Introduction to NEM-4 Troubleshooting

General guidelines for NEM-4 Troubleshooting

Tools needed for troubleshooting

General guidelines

Nominal current consumption

Troubleshooting Paths

Dead or jammed device

Partially damaged device

Most common symptoms reported by customer

Most common symptoms for audio problems

Most common symptoms for USB and BT problems

Symptoms related to energy management

Problems related to UI:

Most common RF related symptoms:

ASIC is changed

UEM changed

UPP_WD2 changed

ZOCUS changed

Test points

“CONTACT SERVICE” on display

Baseband HW Subarea Troubleshooting

Flashing troubleshooting

ADSP flashing troubleshooting

Energy management troubleshooting

Device does not stay on

General power checking

VCOREA troubleshooting

VMEMA troubleshooting

Audio power troubleshooting

Clocks troubleshooting

Charging checking

Energy management calibration

ADC-reading

Backup battery

SIM card

Audio troubleshooting

Microphone

Earpiece

Headset troubleshooting

Memory troubleshooting

MMC troubleshooting

USB troubleshooting

VIBRA

ZOCUS

UI Troubleshooting

UI troubleshooting cases

Keymat backlight

Keyboard

Display blank

Backlight does not turn on

FM Radio Troubleshooting

FM radio component layout

FM radio troubleshooting diagram

Notes to "FM Radio Troubleshooting diagram"

Diagrams of FM radio signals

RF Troubleshooting

Abbreviations in fault finding charts

Introduction

RF key component placement

RF measurement points

RF supply points

Measurement points in the receiver

Measurement points in the transmitter

RF in General

RF Power Supply Configuration

Receiver

General instructions for RX troubleshooting

Measuring RX I/Q signals using RSSI reading

Measuring RX performance using SNR measurement

Measuring frontend power levels using spectrum analyzer

Measuring analogue RX I/Q signal voltages using oscilloscope

Receiver fault finding

Rx signal paths

Antenna switch (RX/TX switch)

Front-end