Nokia 7270, 6170 Service Manual 06 rm 8 troubleshooting

Nokia Customer Care

RM-8/RM-47/RM-48 Series Transceivers

6 - Troubleshooting Instructions

RM-8/RM-47/RM-48 Company confidential

6 - Troubleshooting Instructions Nokia Customer Care

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RM-8/RM-47/RM-48

Nokia Customer Care

Table of Contents

Page No

Introduction ........................................................................................................ 1

General Failures ................................................................................................. 2

Phone is dead .................................................................................................... 2

Flash programming doesn’t work ....................................................................... 3

Charging Failure ................................................................................................ 6

Phone doesn’t stay on, or phone is jammed ...................................................... 7

Display Information: “Contact Service” .............................................................. 8

Function Failures ............................................................................................. 10

Camera Failure ................................................................................................ 10

Camera viewfinder failure ................................................................................ 11

FM-radio Failure ............................................................................................... 12

Infrared Communication Failure ....................................................................... 13

SIM Failure ....................................................................................................... 14

Display Failure ................................................................................................. 15

Main display failure ........................................................................................ 16

Mini display failure ......................................................................................... 17

Main display illumination fault ........................................................................ 18

Mini display illumination fault ......................................................................... 19

USB Data Transmission Failure ....................................................................... 20

Audio Failure .................................................................................................... 21

Uplink or downlink failure ............................................................................... 21

Uplink missing audio signal............................................................................ 22

Uplink weak audio signal ............................................................................... 23

Uplink distorted audio signal .......................................................................... 24

Uplink TDMA noise ........................................................................................ 25

Downlink missing audio signal ....................................................................... 26

Downlink weak audio signal........................................................................... 27

Downlink distorted audio signal ..................................................................... 28

Downlink noise in audio signal....................................................................... 29

Downlink TDMA noise.................................................................................... 30

Various noise problems ................................................................................. 31

Vibra errors .................................................................................................... 32

BackLight Failure ............................................................................................. 33

Key Failure ....................................................................................................... 34

Power Key Failure.......................................................................................... 34

Volume key failure ......................................................................................... 35

Keypad failure ................................................................................................ 36

RF Troubleshooting ......................................................................................... 37

RF Key Component Placement....................................................................... 38

ISSUE 2 03/2005 COMPANY CONFIDENTIAL 3

RM-8/RM-47/RM-48

Nokia Customer Care

RF test points ................................................................................................... 39

Receiver ........................................................................................................... 40

Transmitter ....................................................................................................... 41

Synthesizer ...................................................................................................... 42

RF in General.................................................................................................... 43

RF Power Supply Configuration ..................................................................... 45

General Specifications of Transceiver........................................................... 46

Receiver Verification and Troubleshooting................................................... 48

General instructions for RX Troubleshooting ................................................... 48

Measuring RX I/Q Signals using RSSI Reading ............................................ 48

Measuring RX Performance using SNR Measurement ................................. 49

Measuring Front-End Power Levels using Spectrum Analyzer...................... 51

Measuring Analogue RX I/Q Signals using Oscilloscope .............................. 51

Fault Finding Chart of the Receiver ................................................................. 51

RX Signal Paths ............................................................................................... 56

Antenna Switch (RX/TX Switch) .................................................................... 56

RX front-end................................................................................................... 57

RX paths of RF ASIC ..................................................................................... 57

Transmitter ....................................................................................................... 58

General Instructions for Transmitter Troubleshooting ...................................... 58

Transmitter troubleshooting ............................................................................. 58

Antenna Switch (TX/RX switch) ..................................................................... 58

GSM850 Transmitter ........................................................................................ 59

General Instructions for GSM850 TX Troubleshooting .................................. 59

Fault Finding Chart for GSM850 Transmitter................................................. 62

GSM900 Transmitter ........................................................................................ 63

General Instructions for GSM TX Troubleshooting ........................................ 63

Fault Finding Chart for GSM900 Transmitter................................................. 65

GSM1800 Transmitter ...................................................................................... 68

General instructions for GSM1800 TX Troubleshooting ................................ 68

Fault finding chart for GSM1800 transmitter .................................................. 70

GSM1900 Transmitter ...................................................................................... 71

General instructions for GSM1900 TX Troubleshooting ................................ 71

Fault finding chart for GSM1900 transmitter .................................................. 73

Synthesizer ....................................................................................................... 77

Synthesizer operation check ............................................................................ 77

Reference Oscillator 26 MHz (VCTCXO) ......................................................... 79

Voltage Controlled Oscillator (VCO) ................................................................ 79

Frequencies ..................................................................................................... 81

DC Supply Current Check ............................................................................... 83

4 COMPANY CONFIDENTIAL ISSUE 2 03/2005

RM-8/RM-47/RM-48

Nokia Customer Care

Phoenix Tuning ................................................................................................ 84

General instructions for tuning: ...................................................................... 84

RF Tuning after Repairs ................................................................................... 84

Semi-automatic Calibrations & Measurements - step by step: RX/TX and GSM-Bands

84

RX Calibration................................................................................................ 84

RX Band Filter Response Compensation ...................................................... 88

RX Channel Select Filter Calibration ............................................................. 92

TX Power Level Tuning.................................................................................. 94

TX I/Q Tuning................................................................................................. 98

Fully automatic Calibration, Tuning & Measurement by Phoenix “Auto-Tune” 104

Preparations for Phoenix ............................................................................. 104

Automatic tuning procedure ......................................................................... 107

FM-radio troubleshooting (RM-8 only) ......................................................... 109

FM-Radio Troubleshooting ............................................................................ 110

ISSUE 2 03/2005 COMPANY CONFIDENTIAL 5

RM-8/RM-47/RM-48

Nokia Customer Care

Introduction

This document describes in overview the different hardware error possibilities for the RM-8, RM-47 and RM-48 phone.

Not every possible hardware error is described in this document, but only those possible to correct.

Issue 2 03/2005 COMPANY CONFIDENTIAL 6

Issue 2 03/2005

Nokia Customer Care

General Failures

■ Phone is dead

This means that the phone doesn’t use any current at all when supply is connected and/or power key is pressed. It is assumed that the voltage supplied is 3,9Vdc. UEMEK will prevent any functionality at battery/supply levels below 2,9Vdc and the software will shut the phone down at 3,1Vdc.

7 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

Phone is dead

Nokia Customer Care

Figure 1: Phone is dead

Yes

Measure voltage on L2350, L2351,

L2352, L2353, L2354, L2355 and

L2200. Should be ~3,9V

Yes

Measure voltages on both sides of

R2407 when power key is pressed.

Should be ~0V

Yes

Sleep clock on J2800:

~32,768 kHz, 1,8Vpp

Yes

Measure voltage on PURX = 1,8Vdc

on J2802. ~1 sec after power key

is pressed.

Yes

Measure voltage on VR3=2,78 Vdc

onC2207 pin 1

No

Failure in VBATT line:

Check X2000, L2350, L2351, L2352,

L2353, L2354, L2355, L2200, C2350,

C2351, C2352 and PWB

Check:

R2407, S2401 and PWB

Check:

B2200, C2202, C2203, D2200

and PWB

Check:

D2200 and PWB

Check:

D2200, C2207 and PWB

Yes

Verify that system clock is @

~26 MHz, min 300m VACpp on C2901 pin 2 towards D2800 (TIKU) with regular probe C in ~10-13pF /

10M

Yes

Check:

D2800 (TIKU) and D3000 (flash)

and D3001 (SDRAM)

No

C2901, R2901, N7500 (Helgo),

Check:

G7501 (26 MHz XTAL) and PWB

■ Flash programming doesn’t work

The flash programming on RM-8 boards is only possible via the pads on the PWB.

In case of Flash failure in production (FLALI station), problem is most likely related to SMD problems. Possible failures could be short-circuiting of balls under µBGAs (e.g. UEMEK, TIKUEDGE, SDRAM, FLASH), missing or misaligned components.

Issue 2 03/2005 COMPANY CONFIDENTIAL 8

Issue 2 03/2005

Nokia Customer Care

In flash programming error cases the flash prommer (via Phoenix or Darium) can give some information about the fault. The fault information messages could be:

• Phone doesn't set Flashbus TXD line high after VCC is switch on.

• External RAM test failed.

These errors are some of the most common errors and based on this, a fault finding diagram for flash programming is shown below. Various errors can appear from the prommer when flashing the phone - not all of them can be directly linked to the HW or phone.

Because of the use of uBGA components, it is not possible to verify on the diagram, if there is a short circuit in control and address/data lines on TIKUEDGE, NOR flash or SDRAM.

Figure 2: Flash programming doesn’t work

Flash programming does not work

Re-solder/Replace

component

Fix the connections

if possible. Else

scrap the phone

Prommer information is:

External RAM test failed.

(C108)

No

Check SDRAM orientation and

placement. OK?

Yes

No

Check PWB (if possible) and

power lines. Connections OK?

Yes

Replace the SDRAM Flash again

Prommer information is: Phone does not set Flashbus TXD line high after VCC is switched on.

Check J3401, R3400, R3403,

R3405. Connections OK?

Yes

Try reading MCU ID with

Phoenix. Reading OK?

Yes

Try reading flash ID with

Phoenix. Reading OK?

No

Re-solder/Replace

component

Replace UEMEK

or TIKU

Replace NOR

flash

9 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

Nokia Customer Care

Table 1: Most common error messages

Error Description Used signals/components Points to Check

VBAT at C2228

VCORE at C2222,

VIO at C3003

VFLASH1 at R2204

FBUSRX at R3403

FBUSTX state at J2812(TIKU)-

>R3400(UEMEK)

SLEEPX at J2801

VR3 at C2227 and C7526

RFCLOCK at G7501 and R2901

MBUS pulse train at R3405

FBUSTX state at J2812(TIKU)-

>R3400(UEMEK)

MBUS pulse train at R3405

FBUSRX serial data at R3403

FBUSTX state at J2812(TIKU)-

>R3400(UEMEK)

Prommer SW

C101

C102

C103

C107

A204

A387

C583 C683

C584 C684

C585 C685

C586 C686

The Phone does not

set Flashbus TXD

line high after the

The Phone does not

set Flashbus TXD

line low after the line

has been high. The

Prommer generates

this error also when

the Phone is not connected to the

The Phone MCU

has not received the

first dummy word correctly from the Prommer after the

The Phone MCU

can not start

Secondary code

manufacturer and

device IDs in the existing Algorithm files do not match

with the IDs

received from the

target phone.

The MCU ID in the

FIASCO_MCU_ID_I

NFO block of the

MCUSW file does

not match with the

ID received from the

target phone.

The Prommer has

not received Phone acknowledge to the

The Phone has generated NAK

signal during data

block transfer. The Phone has not acknowledged data

block correctly.

The erasing status

response from the

Phone informs about

startup.

Prommer.

startup.

correctly. The flash

message.

fail.

VBAT, VCORE, VIO, VFLASH1

BSI and FBUSRX from Prommer to UEMEK

FBUSTX from TIKU->UEMEK->Prommer (stuck at ‘0’)

SLEEPX from UEMEK to TIKU

RFCLOCK (VCTCX->Helgo->TIKU)

MBUS From Prommer->UEMEK->TIKU(stuck at ‘1’)

FBUSTX from TIKU->UEMEK->Prommer(stuck at ‘1’)

MBUS from Prommer->UEMEK->TIKU(stuck at ‘0’)

FBUSRX from Promm er->UEMEK->TIKU

FBUSTX from TIKU->UEMEK->Prommer

Signals between TIKU and Flash

PURX, VR3

TIKU

Flash

TIKU Prommer SW

Flash and TIKU

Flash

BSI pulse at C2003 when flashing starts

PURX state transition ‘0’ to ‘1’ at J2802

Issue 2 03/2005 COMPANY CONFIDENTIAL 10

Nokia Customer Care

■ Charging Failure

Charging fails and no current

drawn from ‘charger’

Yes

Issue 2 03/2005

Measure Vchar voltage on V2000. Is it > 3.0V?

Yes

Recalibrate charger circuitry

and retest. Did it work?

Yes

END

Display information when charger

connected: “Not charging”

Yes

Recalibrate charger circuitry

and retest. Did it work?

No

Yes

X2003, F2000, L2000, V2000,

Check:

C2005, C2006 and PWB

D2200 (UEMEK) is faulty

END

No

Verify through Phoenix that BSI=

~68k Ohm (BL-4C) and BTEMP=

~47k Ohm @ roomtemperature

(~25 C)

Yes

Measure voltage on R2200 towards

D2200. Should be the same as

Vbat voltage

Yes

Phone should work. If not,

change whole engine board

No

BSI: Battery (BL-4C), R2015

C2003, R2361, R2362 and PWB

BTEMP: R2000, C2004, R2360,

R2200, D2200 (UEMEK) and PWB

Check:

R2363 and PWB

Check:

11 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

Nokia Customer Care

■ Phone doesn’t stay on, or phone is jammed

If this kind of a failure is presenting itself immediately after FLALI, it is most likely caused by ASICs missing contact with PWB.

If the MCU doesn’t service the watchdog register within the UEMEK, the operations watchdog will run out after approximately 32 seconds. It is not possible to measure this service routine.

Figure 3: Phone doesn’t stay on, or is jammed

Phone doesn’t stay on or phone is

jammed

Yes

Sleep clock on J2800 ~32,768 kHz; 1,8Vpp

Yes

Verify that system clock is @

~26 MHz, min 300m VACpp on C2901 pin2 towards D2800 (TIKU) with regular probe Cin ~10-13pF /

10M

Yes

Measure voltage on PURX=

1,8 Vdc on J2802

~1 sec after power key is pressed

Yes

No

B2200, D2200 (UEMEK),

Check:

C2202, C2203 and PWB

Check:

C2901, R2901, N7500 (Helgo),

G7501 (26 MHz XTAL) and PWB

Check:

D2200 (UEMEK) and PWB

UI functionality and keys react to

pressure?

Yes

Is everything working until phone

shuts down after ~32 sec?

No

Retest and if phone still doesn’t work,

change whole engine board

No

D2800, D3000, D3001, Z2400, Z2401,

keymat, lightguide and PWB

Yes

Change D2200 (UEMEK)

Check:

Issue 2 03/2005 COMPANY CONFIDENTIAL 12

Issue 2 03/2005

Nokia Customer Care

■ Display Information: “Contact Service”

When this error appears in the display it means that one or more of the internal baseband tests has failed. The baseband tests (self tests) are performed each time the phone is powered on. The self tests are divided into those performed while powering up (Start up tests) and the ones that can be executed with a PC using Phoenix (Runtime tests). The following Start-up tests are performed during power up:

AUX DA LOOP TEST

EAR DATA LOOP TEST

KEYBOARD STUCK TEST

MBUS RX TX LOOP TEST

PPM VALIDITY TEST

SIM CLK LOOP TEST

SIM IO CTRL LOOP TEST

SLEEP X LOOP TEST

TX IDP LOOP TEST

TX IQ DP LOOP TEST

BACKUP BATT TEST

CAMERA IF TEST

SIM LOCK TEST

WARRANTY TEST

FLASH CHECKSUM TEST

RADIO TEST

IR IF_TEST

UEM CBUS IF TEST

PA TEMP TEST

EXT RAM DATA BUS TEST

EXT RAM ADDR BUS TEST

If all these self tests are passed, the phone will start up.

From Phoenix it’s possible to run all the self tests and the additional “Runtime test”. The test cases can be seen below.

13 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

Nokia Customer Care

Figure 4:Display Information: “Contact Service”

Issue 2 03/2005 COMPANY CONFIDENTIAL 14

Nokia Customer Care

Function Failures

■ Camera Failure

Start

Issue 2 03/2005

Does the

viewfinder

start?

Yes

End

No

Check engine PWB

in module jig. Does

camera work?

No

Check X2400.

Failure in

Lower block

OK?

Yes

Displays (VCORE_LIN) working OK?

Yes

No

Change/fix and retest

No

Failure in

Upper block OR

Hinge Flex

Check

VCORE_LIN 1.8V

from module jig.

OK?

Check Upper block

in module jig. Does

camera work?

No

Failure in

Upper block

Check Camera positioning in socket X3603.

Yes

Check X3602,

C3609-C3612,

Z3601, C3624- C3625 and lines. OK?

Yes

Failure in

Camera module

No

Check C2222

(1/2). OK?

Yes

OK?

YesYes

No

Failure in Hinge

Flex. Change

and retest.

Adjust & retest

According to repair instructions –repair

or change Upper

block Flex As sy

Change Upper

block Flex Assy

and retest.

Change/fix

defect component

and retest

Measure

CamCtrlClk from

module jigs

test point. Is it

13 MHz?

No

Change

TIKU

(D2800)

Retest

Change UEMEK

(D2200)

15 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

■ Camera viewfinder failure

Viewfinder working but no

picture taken when pressing

select-key

Nokia Customer Care

Select key

functional ?

Yes

R3304 = 6,5 MHz

clock when

pressing select?

Yes

No

Check

keyboard with

Phoenix

Check for

short circuit

of R3304

Z2401 and

domesheet

OK ?

Yes

Short circuit?

Yes

No

Replace

Z2401 and/or

domesheet

PWB

failure

Camera

failure

Replace

component

Reflash phone

Issue 2 03/2005 COMPANY CONFIDENTIAL 16

Nokia Customer Care

■ FM-radio Failure

The FM-radio troubleshooting guide is in the RF section.

Issue 2 03/2005

17 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

■ Infrared Communication Failure

IrDA failure

Yes

Nokia Customer Care

Measure

VBAT at C2600

= 3,7- 4,2 V?

Yes

Measure

VFLASH1 at

C2602

= 2,78 V?

Yes

Measure

VIO at

C2603

= 1,80 V?

No

Defect PWB

Replace

D2200

Replace

D2200

Yes

Measure

activity TXD

on N2600

pin3?

Yes

Replace

N2600

No

Replace

D2800

Issue 2 03/2005 COMPANY CONFIDENTIAL 18

Issue 2 03/2005

Nokia Customer Care

■ SIM Failure

The hardware of the SIM interface from the UEMEK (D2200) to the SIM connector (X2700) can be tested without a SIM card. When the power is switched on, the phone first checks for a 1,8V SIM card and then a 3V SIM card. The phone will try this four times, whereafter it will display "Insert SIM card".

The error ”SIM card rejected” means that the ATR message received from the SIM card is corrupted, e.g. data signal levels are wrong. The first data is always ATR and it is sent from card to phone.

Figure 5: SIM Failure

19 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

■ Display Failure

Start

Nokia Customer Care

Do

both displays

start ?

Yes

No

Both

displays

fail?

Yes

Check Hinge

flex, X2400,

X3602. OK ?

Yes

Measure VFlash1

Measure

at 1/2 of C2220

VDD (~2,8V)

and Vcore_Lin at

from C2220

1/2 of C2222.

VDDI (~1,8V)

OK?

from C2222

No

Main display

fails

Mini display

fails

Change defect

components.

OK ?

Check Hinge

flex, X2400,

X3602 and

lines. OK ?

No

Go to “Main display

failure”

Go to “Mini display

failure”

Change upper

block.

Change UEMEK

(D2200)

Yes

END

Measure RESX

Measure

from X2400

RESX from

(~1,8V). OK?

C2222

(~1,8V). OK ?

Yes

Are the

backlights OK ?

No

Check Hinge

flex, X2400,

X3602 and

lines. OK ?

No

Change TIKU

(D2800)

Go to

“Main/Mini display

illumination

fault”

Issue 2 03/2005 COMPANY CONFIDENTIAL 20

Nokia Customer Care

Main display failure

Start

Issue 2 03/2005

Main display

fails ?

No

Yes

Check hinge flex,

X2400, X3600

and X3602. OK ?

Yes

Measure

VFlash1

VDD (~2,8V)

from C3607,

Vcore_lin (1,8V)

VDDI (~1,8V)

from C3608.

OK ?

No

Change defect

components.

OK ?

Change UEMEK

(D2200)

Yes

END

21 COMPANY CONFIDENTIAL Issue 2 03/2005

Change display

module

RM-8/RM-47/RM-48

Mini display failure

Start

Nokia Customer Care

Mini display

fails ?

No

Yes

Check hinge flex,

X2400, X3601

and X3602. OK ?

Yes

Measure

VFlash1 (

VDD (~2,8V) from C3606,

Vcore_lin (1,8V)

VDDI (~1,8V)

from C3605.

OK ?

Yes

No

Change defect

components.

OK ?

Change UEMEK

(D2200)

END

Issue 2 03/2005 COMPANY CONFIDENTIAL 22

Change display

module

Nokia Customer Care

Main display illumination fault

Start

Issue 2 03/2005

Are the Main

display

backlights

OK ?

Yes

No

Check N2400, V2404,

R2403, C2411- C2413,

L2400, X2400, X3602

(Hinge flex) and

X3600. OK ?

Yes

Measure

VLED+ (~14V)

from V2404.

OK ?

No

Change defect

components.

Retest.

Change UEMEK

(D2200)

Yes

END

23 COMPANY CONFIDENTIAL Issue 2 03/2005

Change display

module

RM-8/RM-47/RM-48

Mini display illumination fault

Start

Nokia Customer Care

Are the Mini

display

backlights

OK ?

Yes

No

Check D2400, R2400,

C2402, C2403, X2400, X3602

(Hinge flex) and

X3601. OK ?

Yes

Check LED’s

V3600, V3601,

V3602 and

lines.

OK ?

No

Change defect

components.

Retest.

Change defect

components.

Retest.

Yes

Change UEMEK

(D2200).

END

Issue 2 03/2005 COMPANY CONFIDENTIAL 24

Nokia Customer Care

■ USB Data Transmission Failure

Issue 2 03/2005

25 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

■ Audio Failure

Uplink or downlink failure

Nokia Customer Care

Start

Uplink = outgoing audio from e.g. microphone

Is there

an audio

signal?

Yes

Is audio

level

sufficient?

Yes

Is audio

signal

undistorted?

Yes

Is TDMA

noise

inaudible?

No

Uplink

Go to “Uplink

missing audio

signal”

Go to “Uplink

weak audio

signal

Go to “Uplink

distorted audio

signal”

Go to “Uplink TDMA noise”

”

Is problem

uplink or

downlink?

Downlink = incoming audio to e.g. earpiece

Downlink

Is there

an audio

signal?

Yes

Is audio

level

sufficient?

Yes

Is audio

signal

undistorted?

Yes

Is audio

signal free

of noise?

No

Go to

“Downlink

missing audio

signal”

Go to

“Downlink

weak audio

signal

”

Go to

“Downlink

distorted audio

signal”

Go to

“Downlink

audio signal

noise”

Yes

Is there no

acoustical

feedback?

Yes

No

Go to

“Acoustical

feedback”

Is TDMA

noise

inaudible?

Yes

Is there no acoustical feedback?

Yes

Click noise, audio signal too loud or

bad picture/

sound

synchronization

No

Go to

“Downlink

TDMA noise ”

Go to

“Acoustical

feedback”

Software

error or bad

TIKU

Issue 2 03/2005 COMPANY CONFIDENTIAL 26

Nokia Customer Care

Uplink missing audio signal

Issue 2 03/2005

Start

Yes

Is mute

deactivated?

Yes

Is problem

present both with

hand portable

and accessory?

No

Is problem

solved when

using

accessory?

Yes

Measure

mic bias. Is it

~2.1V?

No

Deactivate mute

Yes

No

Accessory is

C2107, C2108 and R2104,

in menu

defective

Are any of

the bias components

defective? (Check R2113,

for hand portable and

R2105, C2111, C2112

and R2107 for

accessory)

Yes

NoNo

Replace

UEMEK

Are microphone

contacts and PWB

pads OK?

Yes

Are any of

the components

(L2100, C2109, R2100,

C2100 or C2101 for hand

portable and L2101, C2104

or C2103 for accessory)

missing or

damaged?

No

Replace

microphone

Yes

No

Replace

defective parts.

Is bias ~2.1V?

Yes

No

Clean contacts and pads. If

tracks are badly corroded it

may not be possible to

repair the phone

Replace

defective parts

27 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

Uplink weak audio signal

Start

Nokia Customer Care

Is

microphone

opening

clean?

Yes

Measure bias. Is it

~2.1V?

Yes

No

Clean opening

Are any of the bias components defective? (Check R2113, C2107,

C2108 and R2104)

Yes

Replace

defective parts.

Is bias ~2.1V?

Yes

No

Replace

UEMEK

Are microphone

contacts and PWB

pads OK?

Yes

Are any of the

components

L2100, C2109,

R2100, C2101 or C2100

missing or damaged?

No

Replace

microphone

No

Yes

Clean contacts and pads. If

tracks are badly corroded it

may not be possible to

repair the phone

Replace

defective parts

Issue 2 03/2005 COMPANY CONFIDENTIAL 28

Nokia Customer Care

Uplink distorted audio signal

Start

Issue 2 03/2005

Is there

distortion when

using

accessory?

No

Measure bias. Is it

~2.1V?

Yes

No

Yes

Defect accessory

Are any of the bias

components defective?

(Check R2113, C2107,

C2108 and R2104)

Yes

Replace

defective parts.

Is bias ~2.1V?

No

Replace

UEMEK

Are microphone

contacts and PWB

pads OK?

Yes

Are any of the

components

L2100,C2109, R2100,

C2100 or C2101

missing or

damaged?

No

Replace

microphone

No

Clean contacts and pads. If

tracks are badly corroded it

may not be possible to

repair the phone

Yes

Replace

defective parts

29 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

Uplink TDMA noise

Nokia Customer Care

Start

Is there TDMA

noise both in hand

portable and when

using accessory?

Yes

Replace

the microphone.

Is there still

noise?

Yes

Check for loose,

missing or damaged shielding cans. Check C2101, C2107 - C2109 for handportable and

C2110 - C2112 for

accessory

No

Is there noise

only in hand

portable mode?

Yes

Defective

microphone

No

Defective accessory

Issue 2 03/2005 COMPANY CONFIDENTIAL 30

Nokia Customer Care

Downlink missing audio signal

Start

Issue 2 03/2005

Is problem

present both in

hand portable mode

and when using

FM radio?

Both

Is problem

present both in

speakers

and with

accessory?

Yes

FM radio

No

Is external

antenna (headset) working?

Is problem

related to

earpiece, IHF or

accessory?

Yes

IHF

No

Accessory is not detected or it is

defective

FM module is

defective

IHF is defective.

Check IHF speaker

and connections.

Check L2105, L2104,

C2114, C2116,

C2118 - C2121, N2100,

R2115 – R2117, R2119,

R2120. Check UEMEK.

Accessory

Earpiece

Accessory is

defective

Earpiece is defective.

Check earpiece speaker

and connections. Check R2137 and

R2138. Check UEMEK.

Software or UEMEK

is defective

31 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

Downlink weak audio signal

Start

Is IHF opening

clogged?

Yes

Nokia Customer Care

Clean IHF

opening

Is problem

present both in

earpiece and IHF?

Yes

No

Is problem

related to

earpiece or

IHF?

Earpiece

IHF

No

Is earpiece

opening

clogged?

No

IHF is defective.

Check IHF speaker

and connections.

Check L2105, L2104,

C2114, C2116, C2118 - C2121, N2100, R2115 – R2117, R2119,

R2120. Check UEMEK.

Yes

Clean earpiece

opening

Earpiece is defective.

Check earpiece speaker

and connections. Check R2137 and

R2138. Check UEMEK.

Software or UEMEK

is defective

Issue 2 03/2005 COMPANY CONFIDENTIAL 32

Nokia Customer Care

Downlink distorted audio signal

Start

Issue 2 03/2005

Is problem

present both in

earpiece and

IHF?

Yes

No

Is problem

related to earpiece

or IHF?

Earpiece

IHF

IHF is defective.

Check IHF speaker

and connections.

Check L2105, L2104,

C2114, C2116,

C2118 - C2121, N2100,

R2115 – R2117, R2119,

R2120. Check UEMEK.

Earpiece is defective.

Check earpiece speaker

and connections.

Check R2137 and R2138.

Check UEMEK

Software, FM module

or UEMEK

is defective

33 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

Downlink noise in audio signal

Start

Nokia Customer Care

Is the noise electrical or

mechanical?

Electrical

Is the noise

associated with

earpiece/IHF

(hand portable

mode) or

FM radio?

FM radio

Is the noise

associated with

accessory?

Mechanical

Earpiece/IHF

No

Loose speaker or

other component

inside the phone

No

Does the error

occur both

in earpiece and

IHF?

Yes

Defective FM

Defective

speaker

Software error.

Defective or badly tuned

antenna

module

Yes

Defective

accessory

Issue 2 03/2005 COMPANY CONFIDENTIAL 34

Nokia Customer Care

Downlink TDMA noise

Start

Issue 2 03/2005

Is there TDMA

noise both in hand

portable and when

using accessory?

Yes

Replace battery.

Is there still noise?

Yes

No

Is there noise

only in hand

portable mode?

Yes

Defective

battery

Check for loose, missing

or damaged shielding cans.

Mistuned antenna.

Missing/bad component.

Check that the problem is

not related to uplink TDMA

noise

No

Defective accessory

35 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

Various noise problems

Nokia Customer Care

Start

Sound level

too loud

No

Click

noise

No

Picture/sound

synchronization

Yes

Software

error

Software

error

Bad TIKU

Issue 2 03/2005 COMPANY CONFIDENTIAL 36

Nokia Customer Care

Vibra errors

Start

Is there any

vibration?

Yes

No

Issue 2 03/2005

Wrong setting or software error.

Contact problem.

Mechanical problem

- counterweight is blocked. Defective or missing vibra.

Defective UEMEK.

Is there any

sufficient

vibration?

Yes

Vibra is

constantly

switched on?

No

Intermittent

vibration?

No

Yes

Software error.

Contact problem.

Defective vibra.

Defective UEMEK.

Software error.

Defective UEMEK.

Short circuit.

Bad connection.

Defective vibra.

Mechanical problem

- counterweight hits D-cover/PWB.

Loose parts in phone

Acoustical

noise?

Yes

37 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

■ BackLight Failure

Start

Nokia Customer Care

Are the main

display LED’s

working?

Yes

Are the mini

display LED’s

working?

Yes

Are the

keyboard LED’s

working?

No

Go to “Main display

illumination fault”

Go to “Mini display illumination fault”

Check D2401, C2400,

C2401, R2401, V2416

and measure every

LED (~3,2V). OK?

No

Change defect component. If it still fails change

UEMEK (D2200).

Yes

END

Issue 2 03/2005 COMPANY CONFIDENTIAL 38

Retest

Nokia Customer Care

■ Key Failure

Power Key Failure

Keypad fault

Issue 2 03/2005

Powerkey

OK ?

No

Measure

voltage from

S2401.

Is it high?

Yes

Measure

voltage from

S2401 when

pressed. Is

it high?

Yes

Check S2401.

Is it OK ?

No

Yes

Check R2407, C2415,

R2445, S2401 and line.

If OK, UEMEK failure

Phone is jammed

Phone is

dead

Change S2401

39 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

Volume key failure

Nokia Customer Care

Volume Up –

key working?

No

Measure

Row4 line from

S2405. Is it

~1,8V ?

Yes

Measure

Col1 from S2405

when pressed. Is

there a 50 u

pulse ?

Yes

No

Check S2405 and Row4

line. If OK, change Z2400.

If it still fails, change

TIKU Edge

Check S2405 and Col1

line. If OK, change Z2400.

If it still fails, change

TIKU Edge

Change TIKU Edge

Volume Down

–key working?

No

Measure

Row4 line from

S2406. Is it

~1,8V ?

Yes

Measure Col2 from S2406 when pressed. Is

there a 50 u

pulse ?

Yes

No

Check S2406 and Row4

line. If OK, change Z2400.

If it still fails, change

TIKU Edge

Check S2406 and Col2

line. If OK, change Z2400.

If it still fails, change

TIKU Edge

Change TIKU Edge

Issue 2 03/2005 COMPANY CONFIDENTIAL 40

Nokia Customer Care

Keypad failure

Issue 2 03/2005

Keys working?

Yes

No

Check Z2400 and

Z2401 (soldering).

OK?

Yes

Measure

Row0-Row4

UP, DOWN and

SELECT lines from

Z2400 and Z2401.

Are voltage

levels ~1,8V?

Yes

No

Change Z2400

and/or Z2401

No

END

Measure

SleepX signal

(J2801), when key is pressed. Is voltage level

~1,8V?

Yes

When keypad is pressed, are the

LED’s lit?

No

Illumination

fault

No

Change Z2400

and/or Z2401. If it

still fails, change

TIKU Edge

41 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

Nokia Customer Care

RF Troubleshooting

Measurements should be done using spectrum analyzer with high-frequency high-impedance passive probe (LO-/reference frequencies and RF power levels) and oscilloscope with a 10:1 probe (DC-voltages and low frequency signals).

The RF-section is build around one RF-ASIC (HELGO N7500). For easier troubleshooting, this RF troubleshooting document is divided into sections.

Before changing HELGO, please check following things: Supply voltages are OK and serial communication is coming from baseband to HELGO.

Please note that the grounding of the PA module is directly below PA-module so it is difficult to check or change. Most RF semiconductors are static discharge sensitive. So ESD protection must be taken care of during repair (ground straps and ESD soldering irons). HELGO and PA are moisture sensitive; so parts must be pre-baked prior to soldering.This does not apply to parts taken directly out of a moisture barrier bag.

Apart from key components described in this document here are a lot of discrete components (resistors, inductors and capacitors) which troubleshooting is done by checking soldering of the component is done properly (for factory repairs checking if it is missing from PWB). Capacitors can be checked for shortening and resistors for value by means of an ohmmeter, but be aware in-circuit measurements should be evaluated carefully.

Please be aware that all measured voltages or RF levels in this document are rough figures. Especially RF levels vary due to different measuring equipment or different grounding of the used probe. When using RF probe a good way is to use metallic tweezers to connect probe ground to PWB ground as close to measurement point as possible.

Issue 2 03/2005 COMPANY CONFIDENTIAL 42

Nokia Customer Care

RF Key Component Placement

Figure 1:

RM-8/RM-47/RM-48

43 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

Nokia Customer Care

RF test points

The RF power supplies are generated in the UEMEK and can be measured either in the Small Signal Chamber or in the Base Band Chamber. On the drawings below small points show the locations of the test points.

Figure 2: Picture of the assembled PWB with chamber

Large Signal Chamber with RF Power Amplifier (PA) and Antenna Switch Module (ASM)

Small Signal Chamber with RF ASIC (Helgo), reference oscillator (VCTCXO) and VCO (separate lid)

Issue 2 03/2005 COMPANY CONFIDENTIAL 44

Nokia Customer Care

■ Receiver

RM-8/RM-47/RM-48

Figure 3: Test points of the receiver

45 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

■ Transmitter

Nokia Customer Care

Figure 4: Test points of the transmitter

Issue 2 03/2005 COMPANY CONFIDENTIAL 46

Nokia Customer Care

■ Synthesizer

RM-8/RM-47/RM-48

Figure 5: Test points of the synthesizer

47 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

RF in General

Nokia Customer Care

Figure 6: RF block diagram

RF block diagram consisting of:

• RF front-end module

• Power amplifier module

• RF ASIC

• VCTCXO module

• VCO module

Issue 2 03/2005 COMPANY CONFIDENTIAL 48

RM-8/RM-47/RM-48

Nokia Customer Care

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

GSM: 869-894 MHz 925-960 MHz

DCS: 1805-1880 MHz

PCS: 1930-1990 MHz

DCS: 1710-1785 MHz

PCS: 1850-1910 MHz

GSM: 824-849 MHz 880-915 MHz

f/4

Helgo

I-signal

Q-signal

f/4

f

f/2

f

32963980 MHz

f

f/2

PLL

26 MHz VCTCXO

Buffer

RX

AFC

VCTCXO 26 MHz

I-signal

Q-signal

TX

49 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

RF Power Supply Configuration

Figure 7:

UEM

Nokia Customer Care

VR1

VR2

VR3

VR4

VR5

VR6

4.75 V [ 4.6V ... 4.9V ]

charge pump (VCP)

2.78 V [ 2.70V ... 2.86V ]

Tx modulator (Vcc_ModOut)

TX buffer & EDGE ALCs (VRF_TX)

2.78 V [ 2.70V ... 2.86V ]

VCTCXO (+VCC)

digital interface (VDIG)

2.78 V [ 2.70V ... 2.86V ]

Rx Front End (VRF_RX)

Bias & Rx CH filters (VF_RX)

RF controls (VPAB_VLNA)

2.78 V [ 2.70V ... 2.86V ]

PLL prescaler (VPRE)

phasing dividers of Rx (VLO)

2.78 V [ 2.70V ... 2.86V ]

BB buffer (VDIG)

VR7

V

refRF01

V

refRF02

VBAT

2.78 V [ 2.70V ... 2.86V ]

16 mA [max. 20 mA]

1.35 V [ 1.32V ... 1.38V ]

100 uA

1.35 V [ 1.32V ... 1.38V ]

100 uA

3.7

2.7 V [ 2.95V ... 4.7V ]

VCO (VCC_VCO)

bias reference (VB_EXT)

bias reference

Triple band PA

(RXIINN, RXQINN)

Issue 2 03/2005 COMPANY CONFIDENTIAL 50

Nokia Customer Care

General Specifications of Transceiver

Parameter Unit

Cellular System GSM850/900, GSM1800, GSM1900

Modulation schemes GMSK, 8-PSK

RX Frequency Band GSM850:824 … 849 MHz

GSM900:925 … 960 MHz GSM1800:1805 ... 1880 MHz GSM1900:1930 … 1990 MHz

TX Frequency Band GSM850:869 … 894 MHz

GSM900:880 … 915 MHz GSM1800:1710 ... 1785 MHz GSM1900:1850 … 1910 MHz

RM-8/RM-47/RM-48

Output Power GMSK GSM850:+5 … +33 dBm (3.2 mW … 2 W)

GSM900:+5 … +33 dBm (3.2 mW … 2 W) GSM1800:+0 … +30 dBm (1.0 mW … 1 W) GSM1900:+0 … +30 dBm (1.0 mW … 1 W)

Output Power 8-PSK GSM850:+5 … 27 dBm (3.2 mW … 0.5 W)

GSM900:+5 … 27 dBm (3.2 mW … 0.5 W) GSM1800:+0 … 26 dBm (1.0 mW … 0.4 W) GSM1900:+0 … 26 dBm (1.0 mW … 0.4 W)

Duplex Spacing GSM850:45 MHz

GSM 900:45 MHz GSM 1800:95 MHz GSM 1900:80 MHz

Number of RF Channels GSM 850:124

GSM 900:174 GSM 1800:374 GSM1900:299

Channel Spacing 200 kHz (each band)

Number of TX Power Levels GMSK

EGSM:15 GSM 900:15 GSM 1800:16 GSM 1900:16

Number of TX Power Levels 8-PSK

51 COMPANY CONFIDENTIAL Issue 2 03/2005

GSM 850:12 GSM 900:12 GSM 1800:14 GSM 1900:14

RM-8/RM-47/RM-48

Nokia Customer Care

Sensitivity, static channel (+25°C)

Frequency Error, static channel < 0.1 ppm

RMS Phase Error < 5.0 °

Peak Phase Error < 20.0 °

EVM, 8- PSK 9 %

Peak EVM, 8- PSK 30 %

EGSM:-102 dBm GSM 900:-102 dBm GSM 1800:-102 dBm GSM 1900:-102 dBm

Issue 2 03/2005 COMPANY CONFIDENTIAL 52

RM-8/RM-47/RM-48

Nokia Customer Care

Receiver Verification and Troubleshooting

■ General instructions for RX Troubleshooting

• Connect the phone to a PC, which has Phoenix Service Software and a dongle installed, using either Repair jig and DAU-9S cable (RS232) or DKU-2 cable (USB).

• Connect the phone to a power supply (DC voltage: 4.0V, max. current: 3A) and an RF signal generator. Switch the phone on.

• Start Phoenix Service Software and open FBUS or USB connection. FBUS connection is available only with DAU-9S cable (contact via test pads on phone board) and USB connection is available only with DKU-2 cable (contact via bottom connector of the phone).

• Select Scan Product (Ctrl-R)

• Wait until phone information (RM-8) is shown in the lower right corner of the screen.

• Follow the instructions in Measuring RX I/Q Signals using RSSI Reading.

Measuring RX I/Q Signals using RSSI Reading

• Start Phoenix Service Software and open FBUS or USB connection.

•Select → Scan Product (Ctrl-R)

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

• Then set operating mode to local mode.

•Select → Testing → RF Controls.

•Select → Band → GSM 850 or GSM 900 or GSM 1800 or GSM 1900.

• Select Active unit → RX.

• Select Operation mode → Burst.

• Select RX/TX Channel → 190 or 37 or 700 or 661.

•Select → Testing → RSSI reading.

In the RSSI Reading window the “measuring mode” shall be set on Sum vector and the “reading mode” on Continuous.

53 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

The setup should now look like this:

Nokia Customer Care

Make the following settings on your signal generator:

• Frequency:

GSM 850: 881.66771 MHz (channel 190 + 67.710 kHz offset)

GSM 900: 942.46771 MHz (channel 37 + 67.710 kHz offset)

GSM 1800: 1842.86771 MHz (channel 700 + 67.710 kHz offset)

GSM 1900: 1960.06771 MHz (channel 661 + 67.710 kHz offset)

• RF power level: 60 dBm @ the antenna connector of the phone/ test jig (Remembering to compensate for the cable and jig attenuation).

• Click on “Start” in RSSI reading window.

The resulting RSSI level shall be – 60 dBm +/– 1 dB in each band.

Measuring RX Performance using SNR Measurement

• Start Phoenix Service Software and open FBUS or USB 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”.

Issue 2 03/2005 COMPANY CONFIDENTIAL 54

RM-8/RM-47/RM-48

Nokia Customer Care

•Select → Testing → RF Controls.

•Select → Band → GSM 850 or GSM 900 or GSM 1800 or GSM 1900.

• Active unit → RX.

• Operation mode →Burst.

• RX/TX Channel → 190 or 37 or 700 or 661.

•Select → Testing → SNR Measurement.

•Select → Measurement mode → Fast SNR (Radio Button).

•Press → Start.

The window “Signal Measurement” pops up informing on frequency and power level of the signal generator to be set.

The setup should now look like this:

• Set frequency and output level of the signal generator.

• Press “ok” and the window will close.

• Read the SNR results.

• Choose the remaining GSM bands and measure according to the procedure described above.

• The values shall exceed:

GSM 850: > 20 dB

GSM 900: > 20 dB

55 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

GSM 1800: > 18 dB

GSM 1900: > 18 dB

Note! SNR measurement may fail due to unwanted radio interference (blocking signals). This can be avoided by keeping the phone in shielded case during measurement. Try also measuring on different channels before taking any further actions.

Measuring Front-End Power Levels using Spectrum Analyzer

• Start Phoenix Service Software and open FBUS or USB 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 → RF Controls.

•Select → Band → GSM 850 or GSM 900 or GSM 1800 or GSM 1900.

Nokia Customer Care

• Active unit → RX.

• Operation mode → Continuous.

• RX/TX Channel → 190 or 37 or 700 or 661.

• Set the frequency and the output level of the signal generator.

Spectrum Analyzer (SA) level values depend on the probe type and shall be verified by a properly working phone sample.

Measuring Analogue RX I/Q Signals using Oscilloscope

There are no test pads for RX I/Q signals so they cannot be measured.

■ Fault Finding Chart of the Receiver

During fault finding, the RX calibration procedure is used to find out, whether all bands are affected (error in common part of the RX chain) or only one band (error in a RX part of the failed band). The calibration procedure is explained in chapter RX calibration.

Take care not to save to phone memory calibration values that are out of limits. Find the error first and repair it. When a defective phone has been calibrated, a possible error in RX

front-end might be masked. In that case one can get a reasonable RSSI reading, although the front-end shows excessive losses. If it is not sure that incorrect re-calibration has been made, following steps shall be done:

• Read the AGC calibration values from phone (don’t calibrate) and check if they are OK.

• Check if RSSI reading is OK.

If both AGC and RSSI are ok, there are no excessive losses in RX chain. If both RX and TX path seem to be faulty it has to be checked if the synthesizer is working.

Issue 2 03/2005 COMPANY CONFIDENTIAL 56

Nokia Customer Care

A

Make sure that the synthesizer is working as described in section Synthesizer of these

as described section Synthes

troubleshooting instructions.

Phoenix:

Operating mode: local

Open

Active Unit: Rx Op. Mode: Burst Rx/Tx channel: default (mid)

Signal Generator:

Level: –80dBm Frequency: RX frequency from Phoenix + 67.71kHz

Make sure that

Synthesizer is working

Yes

All 3 bands

RF Controls

:

Figure 8: Receiver troubleshooting 1 and 2

see

No

Synthesizer Fault Finding Tree

RM-8/RM-47/RM-48

Receiver Fault Chart 1.

Phoenix:

RSSI reading:

Open Check RSSI Level = -80dBm

Execute band.

Rx Calibration

re calibration results within limits?

re all 3 bands measured?

No

Yes

in selected

Are all 3 bands defective?

Yes

Selected band is working and

Yes Next bandNo

Yes

No

calibrated.

re all 3 bands measured?

Yes

Rx chain is functional

and calibrated.

Continue with single band fault finding.

Receiver Fault Chart 2.

57 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

.

Figure 9: Receiver troubleshooting 3, 4, 5 and 6

Oscilloscope:

Check supply voltages of RF ASIC: VR4 = 2.8V

Yes

No

Check supply filter components (C2226, C7519) and UEM

UEMEKUEMEK

Nokia Customer Care

Receiver Fault Chart 3

Oscilloscope:

Check supply voltages of RF ASIC: VR6 = 2.8V

Yes

Oscilloscope:

Check reference voltages of RF part: VrefRF01 = 1.4V

1.35V

Yes

Phoenix:

Operating mode: local

RF Controls

Active Unit: Rx Op. Mode: Rx/Tx channel: default (mid) AGC: 12

Signal Generator:

Level: –55dBm

Frequency: RX frequency from Phoenix no offset

Spectrum Analyzer: 1)

Check Rx/Tx Switch

Depending on selected band, check

GSM850/900 output Rx1 GSM1800 output Rx2 GSM1900 output Rx3

Level at Z7800 output > -75dBm

:

Continuous

Yes

No

Change Z7800

Check supply filter components (C2222, C7521) and UEM

UEMEK

Receiver

Check supply filter

Fault Chart 4.

components (R7511, C7524) and UEM

Note 1): RF levels are dependent on RF probe and have to be validated with a known good sample.

UEMEK

Receiver Fault Chart 5.

Oscilloscope:

Check RF-BB serial interface:

No

Check TikuEDGE D2800

Receiver Fault Chart 6.

RFBusEna1 (J7501) ok?

Yes

Change RF ASIC N7500

Issue 2 03/2005 COMPANY CONFIDENTIAL 58

Nokia Customer Care

RM-8/RM-47/RM-48

Figure 10: Single band troubleshooting (receiver troubleshooting 7 and8)

Select faulty band in Phoenix and continue measurements on dedicated Rx part.

Phoenix:

SNR Measurement:

Open

Meas. Mode: Fast SNR

Start

Press

Signal Generator:

Level: –92dBm

Frequency: RX frequency from Phoenix

Phoenix: SNR measurement ok?

.

(SNR > 18dB)

No

Single band fault finding

Front-end is ok.

Yes

Phoenix:

Operating mode: local

RF Controls

Active Unit: Rx Op. Mode: Rx/Tx channel: default (mid) AGC: 12

Signal Generator:

Level: –55dBm

Frequency: RX frequency from Phoenix no offset

Continue with Receiver Fault Chart 6.

:

Continuo us

Receiver Fault Chart 7.

Phoenix:

Operating mode: local

RF Controls

Active Unit: Rx Op. Mode: Rx/Tx channel: default (mid) AGC: 12

Signal Generator:

Level: –55dBm

Frequency: RX frequency from Phoenix (no offset)

Spectrum Analyzer: 1)

Center Freq: RX frequency from Phoenix

RBW: 20kHz

Check Rx SAW filter of selected band:

GSM850/900 Z7803

output both lines > -80dBm GSM1800 Z7802 output both lines > -80dBm GSM1900 Z7801 single output > -74dBm

:

Continuous

Yes

No

Receiver Fault Chart 8.

Change Rx SAW filter (Z7801, Z7802, Z7803)

depending on selected band

Note 1): RF levels are dependent on RF probe and have to be validated with a known good sample.

59 COMPANY CONFIDENTIAL Issue 2 03/2005

RM-8/RM-47/RM-48

1)

If selected band = GSM1900

Figure 11: Receiver troubleshooting 9

Nokia Customer Care

Receiver Fault Chart 9.

No

Yes

Spectrum Analyzer:

Check external LNA V7800: Output signal pin 3 > - 56dBm

Yes

Spectrum Analyzer:

Check balun T7800: Both output signals at pin 3 & 4 > - 62dBm

Yes

RF ASIC N7500 seems to be defective. Change N7500.

1)

Oscilloscope:

Check voltages for V7800:

No

Change T7800, then V7800 if needed.

Check supply filter

Voltage at C7802 = 2.6V Voltage at C7800 = 0V

No

components around V7800 and RF ASIC N7500

Yes

Change V7800, Check also T7800

Note 1): RF levels are dependent on RF probe and have to be validated with a known good sample.

Issue 2 03/2005 COMPANY CONFIDENTIAL 60

RM-8/RM-47/RM-48

Nokia Customer Care

■ RX Signal Paths

Antenna Switch (RX/TX Switch)

RF signal is fed directly from the lower block antenna connector (X7800) to the antenna switch (Z7800). This switch has the function of a diplexer, which consists of two combined paths (low pass/high pass filter combination), a GSM850/900 and a GSM1800/1900 path. The GSM 850/ 900 input signals pass the switch to Rx1 output. GSM 1800 input signal passes the switch to Rx2 output and GSM 1900 to Rx3 output, depending on the control signals VANT_1, VANT_2 and VANT_3.

Signal paths from the antenna switch to the band filters:

• GSM 850/900:RX1 → GSM850 SAW filter (Z7803) → GSM900 SAW filter (Z7803)

• GSM1800: RX2 → GSM1800 SAW filter (Z7802)

• GSM1900: RX3 → GSM1900 SAW filter (Z7801)

The antenna switch has following typical insertion losses in Rx-mode from its input to output ports:

• GSM 850/900: 1.0 dB

• GSM 1800: 1.3 dB

• GSM 1900: 1.3 dB

Figure 12: Block diagram of antenna switch

EGSM

RX

LPF

HPF

LPF

GSM1800 GSM1900

TX

RX

LPF

Input port (antenna) is on the left side and output ports (Rx/Tx) are on the right side.

TX

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RX front-end

The RX front-end includes three SAW filters GSM 850/900 (US/EU), GSM1800 and GSM1900 to provide the wanted out-of-band blocking immunity. GSM 850/900 and GSM 1800 filters have unbalanced (single-ended) inputs and balanced outputs. The outputs are matched to the corresponding LNA inputs of the RF ASIC (N7500) with differential matching network (LC-type). GSM 1900 band filter has unbalanced input and output. Output of the filter is fed to external LNA (V7800), which improves the noise figure of the receiver. Unbalanced output signal of the LNA is converted to balanced signal with BALUN (T7800) and the balanced signal is then matched to RF ASIC input with a differential matching network (LC-type).

The SAW filters have approximately 2.5 to 3.2 dB insertion losses.

The LNA for the GSM 1900 band provides a gain of approximately 17 to 20 dB.

RX paths of RF ASIC

The balanced GSM 850/900 and GSM 1800 RX signals are amplified by integrated LNA’s, there is one LNA for the lower bands and one for the higher band. The GSM 1900 signal is fed to the pre-gain stage also used for the GSM 1800 signal. After amplification the RX signals are down-converted.

The RX paths of the RF ASIC consist of following sub units:

• Separate LNAs for each of the bands: GSM 850/900, and GSM1800.

• Two PRE-GAIN amplifiers, one for GSM 850/900 and one for GSM1800/1900.

• Two passive I/Q mixers (MIX), one for GSM 850/900 and one for GSM1800/1900.

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Transmitter

■ General Instructions for Transmitter Troubleshooting

• Connect the phone to a PC, which has Phoenix Service Software and a dongle installed, using either Repair jig and DAU-9S (RS232) cable or DKU-2 cable (USB).

• Connect the phone to a power supply (DC voltage of 3.9V) and switch the phone on. The value of the DC voltage of 3.9V at the phone battery connector is crucial.

• Attention: When repairing or tuning transmitter use external DC supply with at least 3A current capability.

• Connect an RF cable between the test jig and the measurement equipment (GSM test equipment, power meter, spectrum analyzer, or similar).

• Make use of an adequate attenuator at the input of your measurement equipment (10dB to 20dB are recommended for a spectrum analyzer or a power meter). Additionally, a DC block is recommended. Assure not to overload or destroy the equipment.

RM-8/RM-47/RM-48

• Start Phoenix Service Software and open USB connection (FBUS if DAU 9S and repair jig used):

•Select → Scan Product (Ctrl-R) and wait until phone information is shown in the lower right corner of the screen.

• Follow the instructions in the chapter Transmitter troubleshooting.

■ Transmitter troubleshooting

Antenna Switch (TX/RX switch)

The antenna switch operates as a diplexer for the RX and TX signals. Moreover, it suppresses the TX harmonics generated by the PA. The antenna switch is a controlled by the RF ASIC using the control signals VANT1, VANT2 and VANT3.

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The table below shows the possible different switching states. To switch the TX -GSM 1800/

VANT2

VC1

[Volt]

VANT3

VC2

[Volt]

VANT1

VC3

[Volt]

Rx1

GSM

850/900

Rx

Rx2

GSM

1800

Rx

Rx3

GSM

1900

Rx

TX_IN_

EGSM

Tx1

GSM

850/900

Tx

TX_IN_

DCS

Tx2

GSM

1800/1900

Tx

0 0 0 X

0 2.7 (0,

2.7 X

850)

0 2.7 0 X

2.7 2.7 0 X

1900 path both signals VANT2 and VANT3 have to be activated. This increases the isolation from the TX-GSM 1800/1900 path to the RX-GSM 1800 path and reduces the feed back of RFpower to the RF ASIC.

■ GSM850 Transmitter

GSM850 chapter is valid only for the RM-9. Start the preparations as described in chapter 8.1 (General instruction for the transmitter troubleshooting).

General Instructions for GSM850 TX Troubleshooting

GMSK:

First, select operating mode to local mode. Then, select → Testing → RF Controls.

In the popped up window:

•Select → Band → GSM 850.

• Active unit → TX.

• Operation mode → Burst.

• RX/TX Channel → 190.

• TX Power Level → 10.

• TX Data Type → Random.

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The Phoenix window should now look like this:

RM-8/RM-47/RM-48

Now the measurement setup, which has been built according to the chapter 8.1, should detect the following output signal of the phone.

P

= +23dBm @ 836.6 MHz

out

If this is not the case, then go to the next chapter 8.3.2.1 GMSK for the troubleshooting.

Start the preparations as described in chapter 8.1.

EDGE:

First, select operation mode to the local. Then, select → Test in g → RF control.

In the popup window these values are common:

• Active unit → TX

• Band → 850

• Operation mode → Burst

• RX/TX Channel → 190

In the popup window TX control values:

•EDGE → ON

• Tx data type → Alternate

• TX PA mode → High

• TX Power level → 10

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The Phoenix window should now look like this:

Nokia Customer Care

Now the measurement equipment should detect the following output signal of the phone:

P

= +24 dBm @ 836.6 MHz

out

If this is not the case, then go to the next chapter 8.3.2.2 EDGE for the troubleshooting.

Start the preparations as described in chapter General Instructions for Transmitter Troubleshooting.

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Vdc >

Nokia Customer Care

Fault Finding Chart for GSM850 Transmitter

In following, it is assumed that the TXP signal is used as trigger-signal. For that a TXP test point is provided.

Figure 13: GSM850 troubleshooting, GMSK

Use Phoenix to select

TX_Data Type: "1" or "0"

TX Power Level: 10

Ch190

Ensure Vbatt=3.9 V

Yes

Oscilloscope

R7707 R7511

C7512

TXP testpoint J7504

C7520 C7526

Yes

Oscilloscope

C7529

C7530

Yes

Oscilloscope

C7532

C7701 VTXB_850 Vdc = 2.88 Volt No Check:

VC1 CONT1 Vdc = 0 Volt Helgo Serial Interface VC2 CONT2 Vdc = 0 Volt Helgo

VC3

R7715 CONT3 Vdc = 2.76 Volt C7701 VPCTRL_850 Vdc > 1.3 Volt

Yes

Spectrum analyzer No Check

Z7700 out, R7705 in RFin_850/900 P>= -3 dBm, 836.6MHz EGSM TX SAW Filter

Use Phoenix to select

TX_Data Type: Random

TX Power Level: 10

N7700RFOut_850/900)

Power = +25 dBm, 836.6MHz Check TXC

GSM850 TX OK

Compare with good sample Helgo

Yes Synthesizer

Yes

Spectrum analyzer Check PA N7700

Z7800 TX1 (PA

Yes

Mode

VREF01

VR2

TXP

VR5 VR3

TXIOUTP

TXIOUTN

TXQOUTP

TXQOUTN

Vac = 0.4 Vpp, Vdc = 1.1 V

CONT3 Vdc = 2.76 Volt

VPCTRL_850

No Check Power Loop

Vdc = 0 Volt

Vdc = 1.35 Volt Check Vdc = 2.78 Volt No Base Band

Vdc = 1.8 Volt

Vdc = 2.78 Volt Vdc = 2.78 Volt

67kHz

1.3 Volt p-p

No Check

Base Band

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Figure 14:GSM850 troubleshooting, EDGE

Use Phoenix to select

TX_Data Type: "1" or "0"

TX Power Level: 10

Ch190

Ensure Vbatt=3.9 V

Yes

Oscilloscope

C7710

R7707 BOM1 VPCTRL_900 BOM2 VPCTRL_900

Yes

Spectrum analyzer Check PA N7700

RF-connector No Check Power Loop

Pout

= +24 dBm, 836.6MHz

Yes

GSM850 TX

OK

Ensure that the GMSK is OK!

IREF01

Mode

R7713

Vdc > 0.5 Volt Check

Vdc = 2.78 Volt No Base Band

Vdc= 0 V

Vdc= 2.7 V

■ GSM900 Transmitter

GSM900 chapter is valid for the RM-8 (EU variant).

General Instructions for GSM TX Troubleshooting

GMSK:

• Set the operating mode to the local mode.

•Select → Testing → RF Controls.

• Wait until the RF Controls window is popped up.

•Select → Band → GSM 900, Active unit → TX, Operation mode → Burst, RX/TX Channel → 37, TX Power Level → 10 and TX Data Type → Random.

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The setup should now look like this:

RM-8/RM-47/RM-48

Now the measurement equipment should detect the following output signal of the phone:

P

= +23dBm @ 897.4 MHz

out

If this is not the case, then go to the next chapter 8.4.2.1 GMSK for troubleshooting.

EDGE:

• Select operation mode to the local.

•Select → Testing → RF control.

In the popup window common values:

• Active unit → TX

• Band → 900

• Operation mode → Burst

• RX/TX Channel → 37

In the popup window TX control values:

•EDGE → ON

• Tx data type → Alternate

• TX PA mode → High

• TX Power level → 10

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The setup should now look like this:

Nokia Customer Care

Now the measurement equipment should detect the following output signal of the phone:

P

= +24 dBm @ 897.4 MHz

out

If this is not the case, then go to the next chapter 8.4.2.2 EDGE for the troubleshooting.

Fault Finding Chart for GSM900 Transmitter

In following, it is assumed that the TXP signal is used as trigger-signal. For that a TXP test point is provided.

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Figure 15:GSM900 troubleshooting, GMSK

Use Phoenix to select

TX_Data Type: "1" or "0"

TX Power Level: 10

Ch37

Ensure Vbatt=3.9 V

Yes

Oscilloscope

R7707 R7511

C7512

TXP testpoint J7504

C7520 C7526

Yes

Oscilloscope

C7529

C7530

Yes

Oscilloscope

C7701

VC1 VC2

VC3

R7715

Yes

Spectrum analyzer No Check

Z7700 out, R7705 in RFin_850/

Compare with good

Yes Synthesizer

Use Phoenix to select

TX_Data Type: Random

TX Power Level: 10

Yes

Spectrum analyzer Check PA N7700

Z7800TX1 (PA N7700 No Check Power Loop

Mode

VREFRF01

VR2

TXP

VR5 VR3

TXIOUTP

Vdc = 1.35 Volt Check Vdc = 2.78 Volt No Base Band

Vdc = 1.8 Volt

Vdc = 2.78 Volt Vdc = 2.78 Volt

Vdc = 0 Volt

67kHz

No Check

Vac = 0.4 Vpp, Vdc =

1.1 V

TXIOUTN

67kHz

Base Band

Vac = 0.4 Vpp, Vdc =

1.1 V

TXQOUTP

67kHz

Vac = 0.4 Vpp, Vdc =

1.1 V

TXQOUTN

67kHz

Vac = 0.4 Vpp, Vdc =

1.1 V

VTXB_900

VANT_2 VANT_3

VANT_1

VPCTRL_90

0

Vdc = 2.78 Volt No Check:

Vdc = 0 Volt Helgo Serial Interface

Vdc = 2.7 Volt Helgo Vdc = 2.7 Volt

Vdc > 1 Volt

P>= -3 dBm, 897.4MHz EGSM TX SAW Filter

900

Helgo

sample

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Spectrum analyzer Check PA N7700

Z7800TX1 (PA N7700

RFOut_850/900)

Power = +25 dBm, 897.4

MHz

Yes

Spectrum analyzer Check

RF-connector No

Pout

= +23 dBm, 897.4 MHz

Yes

GSM900 TX

OK

Nokia Customer Care

No Check Power Loop

Check TXC

Antenna Switch (Z7800)

EDGE:

Figure 16: GSM900 troubleshooting, EDGE

Use Phoenix to select

TX_Data Type: "1" or "0"

TX Power Level: 10

Ch37

Ensure Vbatt=3.9 V

Yes

Oscilloscope

C7710

R7707 BOM1 VPCTRL_900 BOM2 VPCTRL_900

Yes

Spectrum analyzer Check PA N7700

RF-connector No Check Power Loop

Pout

= +24 dBm, 897.4MHz

Yes

GSM900 TX

OK

Iref_1800_1

900

Mode

R7713

Ensure that the GMSK is OK!

Vdc > 0.5 Volt Check

Vdc = 2.78 Volt No Base Band

Vdc= 0 V

Vdc= 2.7 V

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■ GSM1800 Transmitter

General instructions for GSM1800 TX Troubleshooting

Start the preparations as described in chapter “General Instructions for Transmitter Troubleshooting”.

GMSK:

• Set the operating mode to local mode.

•Select → Testing → RF Controls and wait until the RF Controls window is popped up.

•Select → Band → GSM 1800, Active unit → TX, Operation mode → Burst, RX/TX Channel → 700, TX Power Level → 5 and TX Data Type → Random.

The setup should now look like this:

Now the measurement equipment should detect the following output signal of the phone:

P

= +23dBm @ 1747.8 MHz

out

If this is not the case, then go to the chapter Fault finding for GSM1800 transmitter and GMSK for troubleshooting.

EDGE:

• Select operation mode to the local.

•Select → Testing → RF control.

In the popup window common values:

• Active unit → TX

• Band → 1800

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• Operation mode → Burst

• RX/TX Channel → 700

In the popup window TX control values:

•EDGE → ON

• Tx data type → Alternate

• TX PA mode → High

• TX Power level → 5

The setup should now look like this:

Nokia Customer Care

Now the measurement equipment should detect the following output signal of the phone:

P

= +21 dBm @ 1747.8 MHz

out

If this is not the case, then go to the next chapter 8.5.2.2 for Troubleshooting.

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Fault finding chart for GSM1800 transmitter

It is assumed that the TXP signal is used as a trigger-signal and a TXP test point is provided in the following chart.

Figure 17: GSM1800 transmitter troubleshooting, GMSK

TX_Data Type: "1" or "0"

TX Power Level: 5

Ch700

Ensure Vbatt=3.9V

Yes

Oscilloscope

R7707 R7511

C7512

TXP testpoint J7504

C7520 C7526

Yes

Oscilloscope

C7529

C7530

Yes

Oscilloscope

C709

C7531

VC1 VC2

VC3

R7715

Yes Spectrum analyzer No Check T7700 out, R7708 RFin_180

Compare with good

Yes Synthesizer

Use Phoenix to select

TX_Data Type: Random

TX Power Level: 5

Yes Spectrum analyzer Check PA N7700

Spectrum analyzer Check PA N7700

Z7800 TX2 (PA N7700

RFOut_1800/1900)

Power = +22 dBm, 1747.8

= +20 dBm, 1747.8 MHz

MHz

Yes

Spectrum analyzer Check

RF-connector No

Pout

Yes

GSM 1800 TX

OK

Mode

VREFRF01

VR2

TXP

VR5 VR3

TXIOUTP

TXIOUTN

TXQOUTP

TXQOUTN

VTXB_1800

_1900 VANT_2 VANT_3

VANT_1

VPCTRL_18

00_1900

0/1900

No Check Power Loop

Check TXC

Antenna Switch (Z7800)

Vdc = 1.35 Volt Check Vdc = 2.78 Volt No Base Band

Vdc = 2.78 Volt Vdc = 2.78 Volt

Vac = 0.4 Vpp, Vdc =

P>= -3 dBm, 1747.8MHz T7700 Balun

Vdc = 0 Volt

Vdc = 1.8 Volt

67kHz

1.1 V

67kHz

1.1 V

67kHz

1.1 V

67kHz

1.1 V

Vdc = 2.78 Volt No Check:

Vdc = 2.7 Volt Helgo Serial Interface Vdc = 2.7 Volt Helgo

Vdc = 0 Volt Vdc > 1 Volt

sample

No Check

Base Band

Helgo

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Figure 18: GSM1800 transmitter troubleshooting, EDGE

Use Phoenix to select

TX_Data Type: "1" or "0"

TX Power Level: 5

Ch700

Ensure Vbatt=3.9V

Yes

Oscilloscope

C7710

C7707 BOM1 VPCTRL_1800 BOM2 VPCTRL_1800

Yes

Spectrum analyzer Check PA N7700

RF-connector No Check Power Loop

Pout

= +21 dBm, 1747.8 MHz

Yes

GSM 1800 TX

OK

IREF_1800_

1900

Mode

R7715

Ensure that GMSK is OK!

Vdc > 0.5 Volt Check

Vdc = 2.78 Volt No Base Band

Vdc= 0 V

Vdc= 2.7 V

■ GSM1900 Transmitter

General instructions for GSM1900 TX Troubleshooting

GMSK:

• Set the operating mode to local mode.

•Select → Testing → RF Controls

• Wait until the RF Controls window is popped up

•Select → Band → GSM 1900, Active unit → TX, Operation mode → Burst, RX/TX Channel → 661, TX Power Level → 5, TX Data Type → Random.

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The setup should now look like this:

RM-8/RM-47/RM-48

Now the measurement equipment should detect the following output signal of the phone:

P

= +23dBm @ 1880 MHz

out

If this is not the case, then go to the chapter Fault finding chart for GSM1900 transmitter, GMSK troubleshooting.

EDGE:

• Select operation mode to the local.

•Select → Testing → RF control

In the popup window common values:

• Active unit → TX

• Band → 1900

• Operation mode → Burst

• RX/TX Channel → 661

In the popup window TX control values:

•EDGE → ON

• Tx data type → Alternate

• TX PA mode → High

• TX Power level → 5

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The setup should now look like this:

Nokia Customer Care

Now the measurement equipment should detect the following output signal of the phone:

= +21 dBm @ 1880 MHz

P

out

If this is not the case, then go to the next chapter 8.6.2.2 EDGE for the troubleshooting.

Fault finding chart for GSM1900 transmitter

In the following, it is assumed that the TXP signal is used as trigger-signal. For that a TXP test point is provided.

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Figure 19: GSM1900 transmitter troubleshooting, GMSK

Use Phoenix to select

TX_Data Type: "1" or "0"

TX Power Level: 5

Ch661

Ensure Vbatt=3.9 V

Yes

Oscilloscope

R7707 R7511

C7512

TXP testpoint J7504

C7520 C7526

Yes

Oscilloscope

C7529

C7530

Yes

Oscilloscope

C709

C7531

VC1 VC2

VC3

R7715

Yes

Spectrum analyzer No Check

T7700 out, R7708 RFin_180

Compare with good

Yes Synthesizer

Use Phoenix to select

TX_Data Type: Random

TX Power Level: 5

Yes

Spectrum analyzer Check PA N7700

Z7800 TX2 (PA N7700

RFOut_1800/1900)

Power = +22 dBm, 1880

MHz

Yes

Spectrum analyzer Check

RF-connector No

Pout

= +20 dBm, 1880 MHz

Yes

GSM 1800 TX

OK

RM-8/RM-47/RM-48

Mode

VREFRF01

VR2

TXP

VR5 VR3

TXIOUTP

Vdc = 1.35 Volt Check Vdc = 2.78 Volt No Base Band

Vdc = 2.78 Volt Vdc = 2.78 Volt

Vac = 0.4 Vpp, Vdc =

TXIOUTN

Vac = 0.4 Vpp, Vdc =

TXQOUTP

Vac = 0.4 Vpp, Vdc =

TXQOUTN

Vac = 0.4 Vpp, Vdc =

VTXB_1800

_1900 VANT_2 VANT_3

VANT_1

VPCTRL_18

00_1900

P>= -3 dBm, 1880 MHz T7700 Balun

0/1900

No Check Power Loop

Check TXC

Antenna Switch (Z7800)

Vdc = 0 Volt

Vdc = 1.8 Volt

67kHz

No Check

1.1 V

67kHz

Base Band

1.1 V

67kHz

1.1 V

67kHz

1.1 V

Vdc = 2.78 Volt No Check:

Vdc = 2.7 Volt Helgo Serial Interface Vdc = 2.7 Volt Helgo

Vdc = 0 Volt Vdc > 1 Volt

Helgo

sample

79 COMPANY CONFIDENTIAL Issue 2 03/2005

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Figure 20: GSM1900 transmitter troubleshooting, EDGE

Use Phoenix to select

TX_Data Type: "1" or "0"

TX Power Level: 5

Ch661

Ensure Vbatt=3.9 V

Yes

Oscilloscope

C7710

R7707 BOM1 VPCTRL_1900 BOM2 VPCTRL_1900

IREF_1800_

1900

Mode

R7715

Yes

Spectrum analyzer Check PA N7700

RF-connector No Check Power Loop

Pout

= +21 dBm, 1880 MHz

Yes

GSM 1900 TX

OK

Ensure that the GMSK is OK!

Vdc > 0.5 Volt Check

Vdc = 2.78 Volt No Base Band

Vdc= 0 V

Vdc= 2.7 V

Nokia Customer Care

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81 COMPANY CONFIDENTIAL Issue 2 03/2005

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Synthesizer

■ Synthesizer operation check

• Start Phoenix Service Software and open FBUS or USB connection. FBUS connection is available only with DAU-9S cable (contact via test pads on phone board) and USB connection is available only with DKU-2 cable (contact via bottom connector of the phone).

• Select “Scan Product” (Ctrl-R or in menu File - Scan Product).

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

• Set operating mode to local.

• Open window “RF Controls” (menu Testing - RF Controls)

Set the synthesizer to the following mode:

•Select → Band → GSM 1800

Nokia Customer Care

• Active unit → Rx

• Operation mode → Continuous

• Rx/Tx Channel → 700

The setup should now look like this:

To measure the supply voltage VR7, the tuning voltage Vc and the output frequency f

VCO;

see

Figure: Test points of the synthesizer.

The VCO frequency is twice the Rx frequency in the GSM1800 band:

f

= 2 * fRX = 2 * 1842.8 MHz = 3685.6 MHz. The VCO frequency shall be measured at VCO

VCO

output, before or after the 2 dB resistor net attenuator (R7503).

The tuning voltage should be 2.1V

Issue 2 03/2005 COMPANY CONFIDENTIAL 82

.. 2.6VDC at f

DC

= 3685.6MHz.

VCO

RM-8/RM-47/RM-48

Nokia Customer Care

The tuning sensitivity of the VCO is typically 250MHz/V. The typical relation of VCO frequency and tuning voltage is shown in the following diagram:

Figure 1: Typical frequency tuning curve for the Matsushita VCO

Temperature: +25°C

4500

4000

Frequency [MHz]

3500

3000

00.511.522.533.544.555.56

VCTRL [V]

2.55V @ 24.4 .. 25.4°C 2.7V @ 24.4 .. 25.4°C 2.85V @ 24.4 .. 25.4°C

High limit Low limit

If the frequency or the tuning voltage have other values than given in Figure: Typical frequency tuning curve for the Matsushita VCO, then go to chapter ..

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■ Reference Oscillator 26 MHz (VCTCXO)

The reference oscillator is implemented as Voltage Controlled Temperature Compensated Crystal Oscillator (VCTCXO) module. The component (G7501) is located in the Small Signal chamber.

The reference oscillator has two functions:

• 26 MHz Reference frequency for the PLL synthesizer.

• 13 MHz System clock for BB (26 MHz VCTCXO signal is divided by 2 in Helgo RF ASIC N7500, 13 MHz output named REFOUT).

For an error free initial synchronization, the 26MHz frequency of the reference oscillator must be accurate enough. Therefore, an analog voltage with signal name AFC tunes the oscillator. The AFC voltage is calculated using the values “AFC value” and “AFC slope”, which are determined during Rx calibration of the low band.

■ Voltage Controlled Oscillator (VCO)

The VCO is able to generate frequencies in the range of 3296MHz to 3980MHz when the PLL is working properly. The frequency of the VCO is divided by 2 for GSM1800 and GSM1900 operation and by 4 for GSM850 and GSM900 operation. The division is done in RF ASIC and it allows the generation of all the frequencies in the GSM850, GSM900, GSM1800 and GSM1900 bands, both RX and TX range.

The output frequency of the VCO is controlled by a DC voltage (Vc) of the PLL loop filter. The valid range of Vc is 0.7V– 3.8V when the PLL is in steady state. The typical tuning sensitivity is 250MHz/V.

Even if the PLL is not working properly (Vc outside the valid range), a frequency at the output of the VCO can be detected between 3 GHz and 4.4 GHz (if the VCO itself is ok and the supply voltage VR7 = 2.78V is available).

The VCO (G7500) is located under a separate fixed shield in Small Signal chamber.

Issue 2 03/2005 COMPANY CONFIDENTIAL 84

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)

r

A

Figure 2: Troubleshooting the PLL Synthesizer

Setup with Phoenix:

Band: GSM 1800 Mode: RX Continuous Channel: 700

BB not working because 26MHz missing.

For a failure free working of BB the 26MHz clock is necessary! If the 26MHz clock is not working please check first the necessary voltage VR3. This can be checked after power on for a time of about

. After that time the voltage is going down.

32sec

RM-8/RM-47/RM-48

PLL Synthesize Fault Finding T

Spectrum analyzer

VCO out (G7500

f

= 3685.6 MHz

VCO

U

=2.1..2.6V

tune

Yes

PLL Block is functional

Oscilloscope

VCTCXO Supply

No

VR3=2.78V)

(

Yes

Oscilloscope

VCTCXO output at G7501 26MHz,app.0.8Vpp

Yes

Oscilloscope

REFCLK output of N7500: Signal VCTCXO=RFCLK_I at R2901. 13MHz,app.0.8Vpp

Yes

Oscilloscope

VCO supply

(VR7 = 2.78V, VR5=2.78V) VR1=4.7V

Yes

No

Check supply filter components:

C7526, C2227. Check BB and SW.

G7501 defective or shortcircuit to GND.

Check supply filter components:

C7522, VDIG at N7500.

Check R2901, C2901 and N7500.

Check UEM and Software.

Check supply filter components:

R7500, C7500, C7539, C7518, C7520, C7516.

Check UEM and Software.

Spectrum analyzer

Yes

No

Change VCO

VCO out (G7500)

ny signal, freq 3 - 4.4 GHz

Check loop filter components:

C7504, R7502, C7503, R7501, C7502

Wrong writing on RFBus (see BB part)

If ok change RF ASIC N7500

It is important to note that the power supply VR3 of the VCTCXO is only switched off in the socalled ‘Deep Sleep Mode’ and the power supply VR7 of the VCO is switched off in so-called ‘Sleep Mode’.

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Figure 3: VCO output, 1800 band, RX on, continuous output

Nokia Customer Care

■ Frequencies

Table 1: TX, RX and VCO frequency ranges

Band Carrier Frequency Divider used VCO Frequency

GSM 850 Tx 824.2 - 848.8 MHz 4 3296.8 – 3395.2 MHz

Rx 869.2 – 893.8 MHz 4 3476.8 – 3575.2 MHz

EGSM900

DCS 1800 Tx 1710.2 – 1784.8 MHz 2 3420.4 – 3569.6 MHz

PCS 1900 Tx 1850.2 – 1909.8 MHz 2 3700.4 – 3819.6 MHz

Tx 880.2 – 914.8 MHz 4 3520.8 – 3659.2 MHz

Rx 925.2 – 959.8 MHz 4 3700.2 – 3839.2 MHz

Rx 1805.2 – 1879.8 MHz 2 3610.4 – 3759.6 MHz

Rx 1930.2 – 1989.8 MHz 2 3860.4 – 3979.6 MHz

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TX, RX and VCO frequencies for particular channel can be calculated from equations in these tables:

System

GSM850 128 ≤ n ≤ 251 f = 824.2 + 0.2*(n-128) f = 869.2 + 0.2*(n-128) MHz

E-GSM 900

DCS1800 512 ≤ n ≤ 885 f = 1710.2 + 0.2*(n-512) f = 1805.2 + 0.2*(n-512) MHz

PCS1900 512 ≤ n ≤ 810 f = 1850.2 + 0.2*(n-512) f = 1930.2 + 0.2*(n-512) MHz

System

GSM850 128 ≤ n ≤ 251 f = [824.2 + 0.2*(n-128)]*4 f = [869.2 + 0.2*(n-

E-GSM 900

Channel

number

0 ≤ n ≤ 124 f = 890 + 0.2*n f = 935 + 0.2*n MHz

975 ≤ n ≤1023

Channel

number

0 ≤ n ≤ 124 f = (890 + 0.2*n)*4 f = (935 + 0.2*n)*4 MH

TX frequency RX frequency Unit

f = 890 + 0.2*(n-1024) f = 935 + 0.2*(n-1024) MHz

VCO frequency on TX VCO frequency on RX

128)]*4

Uni

t

MH z

z

975 ≤ n ≤1023

DCS1800 512 ≤ n ≤ 885 f = [1710.2 + 0.2*(n-

PCS1900 512 ≤ n ≤ 810 f = [1850.2 + 0.2*(n-

f = [890 + 0.2*(n-1024)]*4 f = [935 + 0.2*(n-1024)]*4 MH

512)]*2

f = [1805.2 + 0.2*(n-

512)]*2

f = [1930.2 + 0.2*(n-

512)]*2

z

MH z

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DC Supply Current Check

For a quick check of DC power supplies refer to the diagram below. Voltage drops are measured at the respective resistors pads. Note, that not all currents can be checked in such a way, see the marking “na” (not applicable) in the diagram.

Figure 4: Checking the DC supply current

UEM

VR1

VR2

VR3

VR4

VR5

VR6

4.78 V [ 4.6V ... 4.9V ]

2.81 V [ 2.70V ... 2.86V ]

charge pump (VCP)

Tx modulator (Vcc_ModOut)

TX buffer & EDGE ALCs (VRF_TX)

VCTCXO (+VCC)

digital interface (VDIG)

Rx Front End (VRF_RX)

Bias & Rx CH filters (VF_RX)

RF controls (VPAB_VLNA)

PLL prescaler (VPRE)

phasing dividers of Rx (VLO)

BB buffer (VDIG)

< na >

R511( =0R ) 0 mV/ <4 mA

< na >

VR7

V

refRF01

V

refRF02

2.81 V [ 2.70V ... 2.86V ]

16 mA [max. 20 mA]

1.36 V [ 1.32V ... 1.38V ]

100 uA

VCO (VCC_VCO)

bias reference (VB_EXT)

< na >

R500 ( =5.6R ) 90 mV/ 16 mA

R525 =4.7k ) x mV/ y mA

VBAT

Issue 2 03/2005 COMPANY CONFIDENTIAL 88

4.1 V [ 2.95V ... 4.7V ]

Triple band PA

< na >

Nokia Customer Care

Phoenix Tuning

General instructions for tuning:

• Connect the phone to a PC, which has Phoenix Service Software and a dongle installed, using either Repair jig and DAU-9S (RS232) cable or DAU-9T cable (RS232) or DKU-5 cable (USB).

• Connect the phone to a power supply (DC voltage of 4.0V, min. current of 3A) and switch the phone on.

• Start Phoenix Service Software and open FBUS connection.

RM-8/RM-47/RM-48

•Select

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

• Set operating mode to “Local”.

→ Scan Product (Ctrl-R)

■ RF Tuning after Repairs

The following tunings have to be performed after repairs:

• Repairs in the TX part will require "TX Power Level Tuning".

• When component replacements around the modulator area (RF path from UEMK via RF ASIC to RF PA) have been done, "TX IQ Tuning" is additionally required.

• In general repairs in the RX front-end always require "RX Calibration" and “Rx Band Filter Calibration” for all three bands.

• Repairs in the PLL circuit always require "RX Calibration" of the low band.

If the RF ASIC was replaced all calibrations mentioned above have to be done.

■ Semi-automatic Calibrations & Measurements - step by step: RX/TX and GSM-

Bands

RX Calibration

The RX Calibration has to be performed to determine gains at different gain settings in the RF ASIC. The calibration must be done in all three bands: GSM 850/900, GSM 1800, GSM 1900.

RX Calibration requires an external RF signal generator. Most of the radio communication testers like CMD 55 or CMU 200 can be used also as RF signal generators, generating continuous RF signals (CW signal) with defined levels and frequencies.

Rx Calibration GSM850 or GSM900

• RM-8 (EU- variant) has to be calibrated on GSM 900.

• RM-9 (US- variant) has to be calibrated on GSM 850.

Open the window “Rx Calibration” in Phoenix Service Software as follows:

•Select

The necessary band selection is made by Phoenix automatically in the low band.

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→ Tuning (Alt-U)

→ Rx calibration (Alt-C)

RM-8/RM-47/RM-48

Nokia Customer Care

The following power levels shall be displayed in the headline:

• Automatic Calibration mode -60 [dBm]

• 1st Manual Calibration mode -50 [dBm]

• 2nd Manual Calibration mode -85 [dBm]

First, connect an RF signal generator to the antenna port of the test jig. Second, select “Calibration mode” to Automatic.

The setup should now look like this:

Press Start: The current calibration values are loaded from the phone memory and displayed in the window as “PM values”.

Press the Calibrate button and a window pops up, instructing you to set the frequency and output power of the RF signal generator:

• Power Level: -60 dBm

• Frequency: 881.667110 MHz (GSM 850) or 942.467110 MHz (GSM 900)

• Compensate for external RF cable and test jig losses.

If a radio communication tester (CMD 55, CMU 200, HP 8960, MT 8801) is used, assure that “continuous mode” is switched on and “modulation” switched off.

Press OK and the calibration will be executed.

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Typical calibration values will look like this:

RM-8/RM-47/RM-48

The results shall be in following limits:

Calibration value / Test case Typical Low limit High limit

AFC value / check AFC_VALUE [DAC] 53 -350 +350

AFC Slope / check AFC_SLOPE [DAC] 128 90 165

Rssi 0 / Check RX GSM xxx Gain A 1 [dB]

Rssi 2 / Check RX GSM xxx Gain A 3 [dB]

GSM xxx

means the selected band: GSM 850 / 900 / 1800 / 1900

65 59 71

77 71 83

Rx Calibration GSM1800 and GSM1900

Both bands are available in all variants of the triple band phones described herein. Thus, the calibration must always be done for both bands, GSM1800 and GSM1900.

Open the window “Rx Calibration” in Phoenix Service Software as follows:

•Select

→ Tuning (Alt-U)

→ Rx calibration (Alt-C)

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•Select → Band → GSM 1800 or GSM 1900

The following power levels shall be displayed in the headline:

• Automatic Calibration mode -60 [dBm]

• 1st Manual Calibration mode -50 [dBm]

• 2nd Manual Calibration mode -85 [dBm]

Connect an RF signal generator to the antenna port of the test jig.

Select “Calibration mode” to Automatic.

The setup should now look like this:

Nokia Customer Care

Press the Calibrate button and a window pops up, instructing you to set the frequency and output power of the RF signal generator:

• Power Level: -60 dBm

• Frequency: 1842.867110 MHz (GSM 1800) or 1960.067110 MHz (GSM1 900)

Compensate for external RF cable and test jig losses. If a radio communication tester (CMD55, CMU200, HP 8960, MT8801) is used, assure that “continuous mode” is switched on and “modulation” switched off.

Press OK and the calibration will be executed.

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Nokia Customer Care

A typical result will look like this:

RM-8/RM-47/RM-48

The results shall be in these limits:

Calibration value / Test case Ty p ic al Low limit High limit

Rssi 0 / Check RX GSM xxx Gain A 1 [dB] 65 59 71

Rssi 2 / Check RX GSM xxx Gain A 3 [dB] 77 71 83

GSM xxx

means the selected band: GSM 850 / 900 / 1800 / 1900.

RX Band Filter Response Compensation

This alignment is necessary to compensate the frequency response of the RX band filters. Rx Band Filter Response Calibration has to be done for all bands. Tuning procedure is identical for all bands; GSM 900 band filter tuning is shown here. The limits are valid for all GSM bands.

Manual Tuning

Open the window “Rx Band Filter Response Compensation” in Phoenix Service Software as follows:

•Select

→ Tuning (Alt-U)

→ Rx Band Filter Response Compensation (Alt-C)

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The necessary band selection is made by Phoenix automatically in the low band.

Press Start and the current “Level Differences (dB)” are loaded from the phone memory and displayed on the “Rx Band Filter Response Compensation” window.

The setup should now look like this:

Connect an RF signal generator to the antenna port of the test jig.

If a radio communication tester (CMD 55, CMU 200, HP 8960, MT 8801) is used, assure that "continuous mode” is switched on and “modulation” switched off.

Compensate for external RF cable and test jig losses.

•Press Tune in Phoenix.

• Adjust the “Input signal Level (dBm)” field to -60 [dBm] on the “Rx Band Filter Response Compensation” window.

Set the RF source as indicated in the pop- up window

:

• Power Level: -60 dBm

• Frequency: 923.267710 MHz

•Press OK.

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The setup should now look like this:

RM-8/RM-47/RM-48

• Follow the instructions for power level and signal frequency input for the remaining “Manual Tuning” stages 2 to 9 as indicated on the pop-up window.

•Press OK after each step.

•Press Stop to finalize the tuning.

Auto Tuning

A faster and more comfortable method for Band Filter Calibration is automatic tuning. This requires an RF signal generator that can be:

• Internally programmed for sweeping or

• Externally controlled by a PC and a SW-program, e.g. HP Vee: Rx_AGC+Bandfilter_Cal.vee.

Open the window “Rx Band Filter Response Compensation” in Phoenix Service Software as follows:

•Select

The necessary band selection is made by Phoenix automatically in the low band.

→ Tuning (Alt-U)

→ Rx Band Filter Response Compensation (Alt-C)

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•Select automatic in the “Tuning mode” in the “Rx Band Filter Response Compen- sation” window.

•Press Start and the current “Level Differences (dB)” are loaded from the phone memory and displayed on the “Rx Band Filter Response Compensation” window.

The setup should now look like this:

Nokia Customer Care

• Adjust the “Input signal Level (dBm)” field on the “Rx Band Filter Response Compensation” window to -60 [dBm].

•Press Tune in Phoenix.

• Set the RF signal generator to -60 dBm and program it according to the list of frequencies that is shown in the pop- up window “ Rx Band Filter Response Compensation for GSM 900”.

• Connect the RF signal generator to the antenna port of the test jig respectively the phone.

• Compensate for external RF cable and test jig losses.

•Press OK.

•Press Stop to finish.

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Limits

The typical value of the “Measured Level Difference (dB)” on channel 37 (middle of band) shall be approximately 0 dB.

RX Channel Select Filter Calibration

Rx Channel Select Filter is a base band filter inside RF ASIC. There is an internal calibration routine for calibrating the channel filter and it is done without external RF signal. The Channel select filter is common part for all bands and it shall be calibrated only in one band.

• Set operating mode to local mode.

•Select

97 COMPANY CONFIDENTIAL Issue 2 03/2005

→ Tuning (Alt-U)

→ Rx Channel Select Filter Calibration (Alt-H)

RM-8/RM-47/RM-48

The setup should now look like this:

Nokia Customer Care

Select Auto in the “Tuning mode” in the “Rx Channel Select Filter Calibration” window.

Press Tune and the optimal values are found.

Press Stop, the values are saved to the phone and the calibration has finished.

The results shall be in following limits:

Calibration value / Test case Typical Low limit High limit

DTOS I Address Rc / check rx baseband filter DTOS_I [DAC]

21 -6 +37

DTOS Q Address Rc / check rx baseband filter DTOS_Q [DAC]

21 -6 +37

BBF I Address BIQUAD I R / check rx baseband filter BIQUAD_IR [DAC]

21 -6 +37

BBF I Address BIQUAD I C / check rx baseband filter BIQUAD_IC [DAC]

21 -6 +37

BBF Q Address BIQUAD Q R / check rx baseband filter BIQUAD_QR [DAC]

21 -6 +37

BBF Q Address BIQUAD Q C / check rx baseband filter BIQUAD_QC [DAC]

21 -6 +37

Notch / check rx baseband filter NOTCH [DAC]

21 -6 +37

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TX Power Level Tuning

RM-8 and RM-9 supports GMSK and EDGE mode for the Power amplifier. Therefore the Power level tuning must be carried out for both modes in each band.It is strongly recommended to use Phoenix Autotune capability.

The functionality of Phoenix Autotune is described in 11.3 Fully automatic Calibration, Tuning & Measurement by Phoenix. Nevertheless manual tuning is described below.

This tuning must be done in all three bands. Note: TX Power Tuning must be done with a peak power meter, e.g. Anritsu model ML2408A with Anritsu Peak Power Sensor MA2442A and a suitable attenuator.

The use of the built-in power meter of GSM testers is likely to cause larger errors than the use of a dedicated power meter and might cause miss tuning so that the phone might be not compliant with the GSM specifications.

Set power supply voltage Vcc=3.9V!

Tx Power Level Tuning GSM850, GSM900, GSM 1800 and GSM 1900 in GMSK mode

Tuning of GSM850, GSM900, GSM 1800 and GSM 1900 work in the same manner, only the band settings are different.

• Start Phoenix Service Software and open USB (FBUS) connection.

•Select

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

• Set operating mode to local mode.

•Select

• Wait until the TX Power Level Tuning window is popped up.

• Connect a calibrated power meter to the RF connector of the phone.

•Select

•Set Edge Off.

→ Scan Product (Ctrl-R)

→ Tuning → TX Power Level Tuning

→Load from → Permanent memory

→ Band → For example GSM900

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Press Start and a window pops up:

Nokia Customer Care

•Select

→ TX Data Type → Random

→ TX PA Mode → High

Adjust DAC Values in TX PA mode ‘High’ for bold power levels according to target values:

Table 2: GSM850, GSM900

Power level Target power Power level Targ e t p o we r

5 32.5 dBm 13 17 dBm

6 31 dBm 14 15 dBm

7 29 dBm 15 13 dBm

8 27 dBm 16 11 dBm

9 25 dBm 17 9 dBm

10 23 dBm 18 7 dBm

11 21 dBm 19 5 dBm

12 19 dBm Base -27 dBm

Issue 2 03/2005 COMPANY CONFIDENTIAL 100

Nokia 7270, 6170 Service Manual 06 rm 8 troubleshooting

Specifications and Main Features

Frequently Asked Questions

User Manual

6 - Troubleshooting Instructions

Introduction

General Failures

■ Phone is dead

■ Flash programming doesn’t work

■ Charging Failure

■ Phone doesn’t stay on, or phone is jammed

■ Display Information: “Contact Service”

Function Failures

■ Camera Failure

■ Camera viewfinder failure

■ FM-radio Failure

■ Infrared Communication Failure

■ SIM Failure

■ Display Failure

Main display failure

Mini display failure

Main display illumination fault

Mini display illumination fault

■ USB Data Transmission Failure

■ Audio Failure

Uplink or downlink failure

Uplink missing audio signal

Uplink weak audio signal

Uplink distorted audio signal

Uplink TDMA noise

Downlink missing audio signal

Downlink weak audio signal

Downlink distorted audio signal

Downlink noise in audio signal

Downlink TDMA noise

Various noise problems

Vibra errors

■ BackLight Failure

■ Key Failure

Power Key Failure

Volume key failure

Keypad failure

RF Troubleshooting

RF Key Component Placement

RF test points

■ Receiver

■ Transmitter

■ Synthesizer

RF in General

RF Power Supply Configuration

General Specifications of Transceiver

Receiver Verification and Troubleshooting

■ General instructions for RX Troubleshooting

Measuring RX I/Q Signals using RSSI Reading

Measuring RX Performance using SNR Measurement

Measuring Front-End Power Levels using Spectrum Analyzer

Measuring Analogue RX I/Q Signals using Oscilloscope

■ Fault Finding Chart of the Receiver

■ RX Signal Paths

Antenna Switch (RX/TX Switch)

RX front-end

RX paths of RF ASIC

Transmitter

■ General Instructions for Transmitter Troubleshooting

■ Transmitter troubleshooting

Antenna Switch (TX/RX switch)

■ GSM850 Transmitter

General Instructions for GSM850 TX Troubleshooting

Fault Finding Chart for GSM850 Transmitter

■ GSM900 Transmitter

General Instructions for GSM TX Troubleshooting

Fault Finding Chart for GSM900 Transmitter

■ GSM1800 Transmitter

General instructions for GSM1800 TX Troubleshooting

Fault finding chart for GSM1800 transmitter

■ GSM1900 Transmitter

General instructions for GSM1900 TX Troubleshooting

Fault finding chart for GSM1900 transmitter

Synthesizer

■ Synthesizer operation check