Nokia 6340i Service Manual 9 rh 13 trouble

CCS Technical Documentation

RH-13 Series Transceivers

Troubleshooting

Issue 1 11/02 ãNokia Corporation

RH-13

Troubleshooting CCS Technical Documentation

Contents

Page No

Transceiver Troubleshooting ......................................................................................... 5

General about testing ...................................................................................................5

Phone operating modes ............................................................................................. 5

Measurement points .....................................................................................................6

Baseband Troubleshooting............................................................................................. 8

Power up sequence ......................................................................................................8

Phone does not start up normally or does not stay on............................................. 11

Flash Programming does not work.......................................................................... 12

Flash programming error codes............................................................................... 14

Charging ....................................................................................................................16

Audio failures ............................................................................................................16

Earpiece or external microphone line does not work.............................................. 18

Microphone or XEAR line does not work .............................................................. 19

Accessory detection ...................................................................................................20

Power supply for data cable .......................................................................................21

Sleep Clock ................................................................................................................21

Display/Keyboard lights do not work ........................................................................23

Display does not work ...............................................................................................24

Buzzer does not work.............................................................................................. 24

Vibra does not work ...................................................................................................25

Keyboard does not work ............................................................................................25

SIM does not work .....................................................................................................25

Infrared does not work ...............................................................................................26

RF troubleshooting....................................................................................................... 27

Repairing instructions for RF Unit ............................................................................27

Introduction............................................................................................................. 27

Abbreviations in fault finding chart ...........................................................................28

Receiver ....................................................................................................................... 29

General instructions for RX troubleshooting .............................................................29

Path of the received signal .........................................................................................30

AMPS........................................................................................................................... 31

Step 1. General checking ...........................................................................................32

Audio test ................................................................................................................ 33

Step 2. Local oscillator checking ...............................................................................34

Step 3. RX chain checking .........................................................................................35

TDMA800.................................................................................................................... 36

GSM850....................................................................................................................... 36

Step 1. General checking ...........................................................................................37

Step 2. Local oscillator checking ...............................................................................38

Step 3. RX chain checking .........................................................................................40

TDMA1900.................................................................................................................. 42

Step 1. Local oscillator checking ...............................................................................43

GSM1900..................................................................................................................... 46

Step 1. General checking ...........................................................................................48

Step 2. Local oscillator checking ...............................................................................48

Step 3. RX chain checking .........................................................................................51

Transmitter................................................................................................................... 53

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CCS Technical Documentation Troubleshooting

General instructions for TX troubleshooting .............................................................53

AMPS/TDMA......................................................................................................... 53

GSM850.................................................................................................................. 53

GSM1900................................................................................................................ 53

Path of the transmitted signal ....................................................................................53

AMPS/DAMPS, GSM850 ...................................................................................... 53

TDMA1900, GSM1900 .......................................................................................... 54

Fault finding charts for transmitter ............................................................................55

AMPS...................................................................................................................... 55

TDMA800, GSM850 .............................................................................................. 58

TDMA1900, GSM1900 .......................................................................................... 58

Power control loop .....................................................................................................61

AMPS AND TDMA................................................................................................ 61

GSM850/GSM1900 ................................................................................................ 62

Synthesizers ................................................................................................................. 63

19.2 MHz reference oscillator ...................................................................................63

RX VHF VCO ...........................................................................................................65

Fault finding chart for RX VHF VCO .................................................................... 65

BB PLL ......................................................................................................................66

Fault finding chart for BB PLL............................................................................... 67

TX VHF VCO ............................................................................................................68

Fault finding chart for TX VHF VCO..................................................................... 68

UHF SYNTHESIZER ...............................................................................................69

Description of RH-13 RF auto-tune tunings................................................................ 70

TDMA RF tunings .....................................................................................................70

TDMA RX tunings.................................................................................................. 70

TDMA TX tunings.................................................................................................. 71

GSM RF tunings ........................................................................................................72

GSM RX tunings..................................................................................................... 73

GSM TX tunings..................................................................................................... 74

PA TROUBLESHOOTING FOR SALIERI ...........................................................75

List of Figures

Fig 1 UEM regulator's filter capacitors................................................................................6

Fig 2 BB testpoints ..............................................................................................................7

Fig 3 Power up sequence .....................................................................................................10

Fig 4 Fault tree, phone does not power up...........................................................................12

Fig 5 Fault tree, charging ....................................................................................................16

Fig 6 Fault tree, earpiece fail ..............................................................................................18

Fig 7 Fault tree, microphone fail .........................................................................................19

Fig 8 Fault tree, accessory detection....................................................................................20

Fig 9 Fault tree, data cable...................................................................................................21

Fig 10 Fault tree, sleep clock...............................................................................................22

Fig 11 Fault tree, Display/Keyboard lights..........................................................................23

Fig 12 Fault tree, display ....................................................................................................24

Fig 13 Fault tree, infra red ...................................................................................................26

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Fig 14 Receiver block diagram............................................................................................30

Fig 15 RF Test .....................................................................................................................33

Fig 16 Audio Test ................................................................................................................33

Fig 17 RF Test. ....................................................................................................................34

Fig 18 Fault finding chart. ...................................................................................................36

Fig 19 General checking. .....................................................................................................37

Fig 20 GSM RSSI Measurement. ........................................................................................38

Fig 21 RX VHF VCO signal level and frequency...............................................................39

Fig 22 UHF VCO.................................................................................................................40

Fig 23 RF controls ...............................................................................................................40

Fig 24 RX I/Q signal............................................................................................................41

Fig 25 IF signal level ...........................................................................................................42

Fig 26 Fault finding chart. ...................................................................................................43

Fig 27 RF Test. ....................................................................................................................44

Fig 28 Fault finding chart ....................................................................................................46

Fig 29 GSM RSSI Measurement. ........................................................................................48

Fig 30 RF controls. ..............................................................................................................49

Fig 31 RX VHF VCO signal level and frequency...............................................................49

Fig 32 UHF VCO signal level and frequency......................................................................50

Fig 33 RF controls. ..............................................................................................................51

Fig 34 RX I/Q signal............................................................................................................51

Fig 35 IF signal level. ..........................................................................................................53

Fig 36 TX signal path. .........................................................................................................54

Fig 37 RF Test. ....................................................................................................................55

Fig 38 RF controls. ..............................................................................................................55

Fig 39 Fault finding chart ....................................................................................................56

Fig 40 TDMA1900. .............................................................................................................58

Fig 41 GSM1900. ................................................................................................................58

Fig 42 Fault finding chart ....................................................................................................59

Fig 43 Power detection. .......................................................................................................61

Fig 44 Fault finding chart for 19.2 MHz oscillator..............................................................64

Fig 45 Fault finding chart for RX VHF VCO......................................................................65

Fig 46 BB PLL.....................................................................................................................66

Fig 47 Fault finding chart for BB PLL. ...............................................................................67

Fig 48 Fault finding chart for TX VHF VCO......................................................................68

Fig 49 Fault finding chart for UHF SYNTHESIZER..........................................................69

Fig 50 Auto tune TDMA .....................................................................................................70

Fig 51 Auto-tune GSM ........................................................................................................72

Fig 52 Fault finding chart ....................................................................................................76

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CCS Technical Documentation Troubleshooting

Transceiver Troubleshooting

General about testing

Phone operating modes

Phone has three different modes for testing/repairing phone. Modes can be selected with
suitable resistors connected to BSI- and BTEMP- lines as following:

Table 1: Mode selection resistors

Mode BSI- resistor BTEMP- resistor Remarks

Normal 68k 47k

Local 560_ (<1k_) What ever

Test 3.3k (> 1k) 560_ (<1k_) Recommended with baseband testing. Same as

local mode, but making a phone call is possible.

The MCU software enters automatically to local or test mode at start-up if correspond­ing resistors are connected.

Note! Baseband doesn't wake up automatically when the battery voltage is connected
(normal mode). Power can be switched on by

• Pressing the power key

• connecting a charger

• RC-alarm function

In the local and test mode the baseband can be controlled through MBUS or FBUS (FBUS
is recommended) connections by a Phoenix service software.

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VR6

VR4

VR2

VR7

VR3

VR1B

VR1A

V

E

V

H

V

H

VANA

VIO

VR5

Troubleshooting CCS Technical Documentation

Measurement points

Figure 1: UEM regulator's filter capacitors

COR

FLAS

FLAS

UEM

VSIM

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UEMINT

PURX

DbusCLK

FbusRX

Dbu

sENX

MbusRX

MbusTX

UEM

FLASH

UPP

CCS Technical Documentation Troubleshooting

Figure 2: BB testpoints

RFCLK:
Init clk

19.22MHz
GSM 13MHz

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Troubleshooting CCS Technical Documentation

Baseband Troubleshooting

Note: ESN and IMEI has to re-written to phone If UEM is replaced. This can be
done only in Central Service.

The Baseband Troubleshooting instructions consists of the following topics:

•Power up

• Flash programming

•Audio

•Earpiece

•Microphone

• Charging

• Accessory detection

• Data cable

•Sleep clock

• User interface

•Display

•Lights

•Buzzer

•Vibra

•Keyboard

•Infra red

• Power up faults

Power up sequence

UEM acts as a HW master during start up

• Vbatt limits: 2.1V for internal state machine, 3V triggering whole startup

• Regulator sequencing

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CCS Technical Documentation Troubleshooting

•Hw "core" regulators "on": Vio, Vcore, VR3, Vflash1

•These regulators are supplying the processors, memory, chip interfaces and

clock source in RF

• Reset releasing delay

•Supply voltages stabilize to their UEM hw default values

•RFCLK grows to full swing

•Core is ready to run but waiting for PURX release

• Reset releasing

•UPP releases the SLEEPX up to "non sleep" -state to prevent the UEM switching

the regulators "OFF"

MCU starts running the Bootstrap Code

•written in stone/ UPP internal ROM

•the program checks if there exists any reason for FDL mode (Flash Down Load)

•If there exists executable code in FLASH and there exists no reason for FDL, the
MCU starts running the MCU program from FLASH.

MCU runs the FLASH MCU code

•the phone initialization, user interfaces, internal blocks etc

•Core regulator voltage setting for required DSP speed

•Initializes the DSP and concerning hw

•Releases DSP reset -> DSP starts running

Note: In the figure below RF_Clk frequency appears to be lower than 19.2MHz
because of too low oscilloscope sampling frequency (2kS/s).

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Figure 3: Power up sequence

1 Power key pressed

• After 20ms UEM enters RESET MODE if VBAT>Vmstr+

2 2) VFLASH1, Vana, Vcore, Vio and VR3 goes high.

• VCTCXO enabled by VR3 -> RFClk 19.2 MHz running.

3 Purx released

• Purx released by UEM, UEMINT goes high for 100 ms and about

500ms RFCLK will change 13MHz (GSM mode), SleepX goes high and

UEM startsfeeding SleepClk (32 KHz) to UPP. NOTE! Sleepclock starts

running in crystal circuitry (B200) immediately when battery voltage is
supplied.

4 Software running

• Default value for Vcore is 1.5 volts and if software is running Vcore will
rise to 1.8 volts.

• Cbus (1.00MHz/GSM and 1.08MHz/TDMA) clock starts running.

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CCS Technical Documentation Troubleshooting

Phone does not start up normally or does not stay on

Note! In case of power up faults, it's not possible to force phone on by disabling watch­dog. Instead, measurements should be done immediately when power key pressed or
when battery voltage connected to phone (local/test mode).

The easist way to check if software is running when phone takes abnormal amount of
current is to measure cbusclk and Vcore.

Dbus clock (programmable 9.72MHz TDMA, 13MHz GSM) is not automatically visible on
test and local mode.

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Troubleshooting CCS Technical Documentation

Figure 4: Fault tree, phone does not power up

OK

Check 13MHz /GSM

or 19.44/TDMA

RF-clock from C420

OK

Tryto start phone to

testor local mode

FAIL

Measure

Vflash1,Vana,Vio,Vcore

,VR3 when pwrkey

pressed

VR3

missing

Check G801

(missing,

misaligned)

FAIL

Check

C420

OK

Check 19.2MHz

from G801

OK

FAIL

OK

FAIL

R816,C867,C8

66, R817, C868

OK

Check

Check the

powerkey

OK

Check R202,

R203, R205,

C217, C220

OK

Check

X101,C108,

C109,Z101

FAIL

Measure VBAT

from C262

OK

OK

troubleshooting

Check that purx
goes up to 1.8V

OK

Measure J406.

1.08

MHz/TDMA

and

1.00MHz/GSM
OK

Change UPP

(D400)

FAIL

FAIL

Re-flash phone

Programmng ok,
but phone doesn't
start

Flash Programming does not work

See RF

Change

G801

Change the
UEM (D200)

Programming
fails

Go to flash failure

chart

Flash programming procedure

• Phone communicates with prommer via production test pattern, using signals:

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CCS Technical Documentation Troubleshooting

•FBUSTX(serial data to phone),

•FBUSRX(serial data from phone),

•MBUS(serial clock for FBUSRX)

•VPP(External flashing voltage for speed up flashing)

• Also BSI line is used when initializing flashing (battery connector)

• When phone is powered (VBAT>3V ) MBUS and FBUSTX lines are pulled up inter­nally by phone.

• Prommer sends command to UEM, using FBUSRX, to enter Flash-mode. During
the sending of this command prommer keeps BSI line high and MBUS is used as a
serial clock.

• When Flash-mode command is acknowledged UEM enters Flash-mode and
releases reset (PURX) to MCU.

• After reset is released UPP checks if there is a request for Bootstrap code (that
resides in UPP ROM).

• Request for Bootstrap is MBUS pulled down by Prommer. (If bootstrap is not
requested, bootstrap code jumps to FLASH SW.)

• If Bootstrap code is requested UPP enters Flash-mode and sets FbusTX to '0' as
acknowledgement to prommer. This is an indication that UPP can run, at least,
the fixed Bootstrap code – although not able to run FLASH code. UPP then sends
an UPP-ID to prommer via FBUSTX line.

• After prommer has received UPP-ID it sends corresponding Secondary Boot Code
to phone via FBUSRX. Secondary Boot Code, when run in UPP, requests UPP to
send information to prommer about flash type and other HW related parameters
about the device to be flashed.

• Prommer then sends the Algorithm Code
and this algorithm, when run in UPP, takes over handling the MCUSW transfer to
Flash.

corresponding to the HW parameters

• 12 volts can be supplied to Vpp (by prommer) to speedup flashing.

• FLASH Program includes a package of MCU and DSP software and all default
parameters for the phone. The tuning values will be added/rewritten during
Flash/Alignment phase.

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Troubleshooting CCS Technical Documentation

Flash programming error codes

Error codes can be seen from "FPS-8 Flash" in Phoenix.

Underlined note means that item under consideration is being used first time in flashing
sequence.

Table 2: Flash programming error codes

Error Description Not working properly

C101 "The Phone does not set FbusTx line high after the

startup."

C102 "The Phone does not set FbusTx line low after the

line has been high. The Prommer generates this
error also when the Phone is not connected to the
Prommer."

C103 "Boot serial line fail." Mbus from Prommer->UEM-

C104 "MCU ID message sending failed in the Phone." FbusTx from UPP->UEM->Prommer

C105 "The Phone has not received Secondary boot codes

length bytes correctly."

C106 "The Phone has not received Secondary code bytes

correctly."

Vbatt
Vflash1
Vcore
VIO
BSI and FbusRX from prommer to UEM.
FbusTx from UPP->UEM->Prommer(SA0)

PURX(also to Safari)
VR3
Rfclock(VCTCXO->Safari->UPP)
Mbus from Prommer->UEM­>UPP(MbusRx)(SA1)
FbusTx from UPP->UEM->Prommer(SA1)

>UPP(MbusRx)(SA0)
FbusRx from Prommer->UEM->UPP
FbusTx from UPP->UEM->Prommer

Mbus from Prommer->UEM->UPP(MbusRx)
FbusRx from Prommer->UEM->UPP
FbusTx from UPP->UEM->Prommer

Mbus from Prommer->UEM->UPP(MbusRx)
FbusRx from Prommer->UEM->UPP
FbusTx from UPP->UEM->Prommer

C107 "The Phone MCU can not start Secondary code cor-

rectly."

A204 " The flash manufacturer and device IDs in the

existing Algorithm files do not match with the IDs
received from the target phone."

A387 "The MCU ID in the MCUSW UPP

C601 "The prommer has detected that Vpp voltage level

has dropped below the limit"

C383
C583
C683

"The Prommer has not received Phone acknowledge
to the message."
(C383-during algorithm download to target phone)
(C583-during erasing)
(C683-during programming)

UPP

Flash
Signals between UPP-Flash

Vpp from prommer - >Flash

Flash
UPP
Signals between UPP-Flash

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CCS Technical Documentation Troubleshooting

C384
C584
C684

C585
C685

C586
C686

"The Phone has generated NAK signal during data
block transfer."
(C384-during algorithm download to target phone)
(C584-during erasing)
(C684-during programming)

Data block handling timeout"
(C585-during erasing)
(C685-during programming)

"The status response from the Phone informs about
fail."
(C586-during erasing)
(C686-during programming)

Flash
UPP
Signals between UPP-Flash

Flash
UPP
Signals between UPP-Flash

Flash

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Troubleshooting CCS Technical Documentation

Charging

Note: Charging voltage and current can be checked by connecting phone to service
software and reading ad- converter values of vchar and ichar.

Figure 5: Fault tree, charging

Phone doesn't start

charging

Connectchargerand

check VCHARIN,

check CHRG_CTRL

if used ACP-9,

LCH-8, LCH-9,

DCH-12, HFU-2

Fail

F100,L100,V100,C105

Check

, R107,C107

OK

Check ICHAR

FAIL

Check

R202,R203,R205,C217,

C220,C201,C202 and

R200

OK

Changethe

UEM

OK

Check bottom

connector

-VIN

- CHRG_CTRL

Audio failures

In case of audio failures there are three possibilities to check audio lines.

1 Make a phone call against tester and check audios.

2 In case of earpiece/XMIC fail: Feed 1Khz signal to XMIC line and measure signal

from earpiece line. Audio test box JBA-8 is needed. Audio loop (Audio test/Ext In
Hp Out) must be switched on by Phoenix service software. This loop will connect
audios only through UEM. In this case UPP is not used.

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CCS Technical Documentation Troubleshooting

3 In case of internal microphone/XEAR fail: Feed tone to microphone and measure

signal from XEAR line. Audio test box JBA-8 is needed. Audio loop (Audio test/Hp
In Ext Out) must be switched on by Phoenix service software. This loop will con­nect audios only through UEM. In this case UPP is not used.

4 Run audio- loop selftest with Phoenix (BB Self tests/ST_EAR_DATA_LOOP_TEST).

This loop will test the eardata/micdata lines between UPP and UEM.

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Troubleshooting CCS Technical Documentation

Earpiece or external microphone line does not work

Figure 6: Fault tree, earpiece fail

Earpiecedoesn't

work

Run audio-loop

selftest with

phoenix

OK

Check R157,L152,

L158,C150,C164,

C153, C165,R152,

C156,C155,R164,
R161,R153,R150,

C159,C167,V153

OK

Check

earpiece

OK

ChangeUEM

Fail

Feed 1KHz to Xmic

by JBA-8 and

measurefrom

earpiece

Fail

OK

Change UPP

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CCS Technical Documentation Troubleshooting

Microphone or XEAR does not work

Figure 7: Fault tree, microphone fail

Microphone doesn't

work

Run audio-loop

selftest with

phoenix

Ok

Check
C151,C152,C157,L151,C162,
C168,C169,R156,R162,R166,
R159,C154,C158,C161,C166,

R163,L159,V152

Ok

Check

microphone

Ok

ChangeUEM

Fail

Feed 1KHz to Mic

and measurefrom

Xear by JBA-8

Fail

Ok

ChangeUPP

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k

Troubleshooting CCS Technical Documentation

Accessory detection

• - Start phone to normal mode when checking accessory detection.

• - Ad- converter value of headint and hookint - lines can be checked with Phoenix
ADC-reading.

• - When headset HDC-9 connected and headset push button is held down, head­int- value should be between 10 and 50 and hookint- value between 0-30.

Figure 8: Fault tree, accessory detection

Accessory detection

doesn'tworknormally

Check HeadInt and

HookInt ad-value with

Phoenix

(No accessory

connected)

- HeadInt and HooInt
~1000

Fail

Check headint-line

L152,C150,R152,C153,

R154,

C160,R153,R150,C159

Ok

Check hookint-line

L159,R163,C158,R155,

R151,C161,V152

Ok

Ok

ConnectHDC-9 and keep the

HDC-9 switch close while

reading headint and hookint

ad-value.

Both values should go close to

zero (~0...50)

Fail

Calibrate ADC

and check
accessory

detection again

O

Check bottom

connector

Ok

Change UEM

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CCS Technical Documentation Troubleshooting

Power supply for data cable

DLR-3 needs power supply for data transfering. SGND will supply 2.8V to DLR-3.

- Start phone to normal mode when checking DLR-3 detection

Figure 9: Fault tree, data cable.

DLR-3 data cable

doesn't work

Connect DLR-3,check

DLR-3 detection

Fail

Check the

componentsof
XMIC, HEADINT
and MICB2 lines

Ok

Check bottom

connector

Ok

Ok

Check VFlash2

(~2.8V)

OK

Check SGND voltage from

bottomconnector

(2.40-2.90V)

Fail

Check V151,V152,R161,

C164,L158

Ok

Fail

Ok

Change UEM

Sleep Clock

Missing/non-functional sleep clock causes

• Entering sleep mode fails (higher current consumption -> shorter standby time)

• Baseband self tests cannot be run

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Troubleshooting CCS Technical Documentation

• Phone clock (on display) does not function properly

Figure 10: Fault tree, sleep clock

Sleep mode

not working

Measure sleep clock

from J404

Ok

Change UPP

(D400)

Fail

Measure sleep clock

from B200

Ok

ChangeUEM

(D200)

Fail

Check C203

&C204

Ok

Change B200

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CCS Technical Documentation Troubleshooting

Display/Keyboard lights do not work

Figure 11: Fault tree, Display/Keyboard lights

Display/Keyboard

lights are not working

Check R300 (Display)and

R301 (Keyboard)

OK

Check LEDs

V300...V303,V310-V311

(Display)and V304...V309

(Keyboard)

OK

Use Display Test in

Phoenix to set lights

ON/OFF

FAIL

FAIL

FAIL

Replace

resistor(s)

Replace

LED(s)

Replace UEM

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Troubleshooting CCS Technical Documentation

Display does not work

Figure 12: Fault tree, display

Displaydoes not work

Check that phon e

powers up no rmally

(current consumption,

power up sequence)

OK

Check display visually

(possible crack s on

COG driver o r glass,

capacitors loose or

broken

OK

Check PW B and

elastomer

connector

FAIL

FAIL

FAIL

Proceed to phone

doesn't power up

troubleshootin g

Replace

displaymodule

Clean PWB and

replace

elastomer if

needed

In any phase of display
troubleshooting use Display Test in
Phoenix to produce test patterns on

display.

Also check w ith a known good

display module to see if it w orks.

OK

Run LCD test in

Phoenix

(BB Se lf Te s ts/

ST_LCD_TEST)

OK

Use Display Test

in Phoenix to

check if display

works

FAIL

Replace

displaymodule

FAIL

Check

capacitors

C302...C304

OK

Replace

elastomer

FAIL

FAIL

Replace

capacitors(s)

Replace

display module

Buzzer does not work

Check spring connectors and C306.

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CCS Technical Documentation Troubleshooting

No sound: Try using known good buzzer instead. If still no sound ->change UEM(D200)

Weak sound: Use Audio test in Phoenix to set buzzer parameters(frequency, strength). If
it doesn't effect to the sound level ->change buzzer.

Vibra does not work

Check spring connectors and C307.

No vibration: Try using known good vibra instead. If still no vibration -> change
UEM(D200)

Weak vibration: Use Vibra test in Phoenix to set vibra parameters(frequency, duty cycle).
If it doesn't effect to the magnitude of vibration ->change vibra.

Keyboard does not work

Check that there is no dirt between the dome sheet and the PWB, also check that Z300 is
properly soldered and the corner mark is located in the right place. If the keyboard still
doesn't operate normally -> try to use Keyboard test in Phoenix to see if the pressed key
is identified. If not ->change UPP(D400), then if this does not help, also change the
Z300.

SIM does not work

Check SIM reader's spring connectors, C390 (VSIM 3.0V) and R388. If SIM still does not
work then probably the UEM or the UPP is broken -> change first one component and
check the phone.

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Troubleshooting CCS Technical Documentation

Infrared does not work

Figure 13: Fault tree, infra red

Infra Red no t working

Measure Vflash1 from IR

module VCC(pin6), should

be 2.78V

OK

Check R350, R351, C351

and V350

OK

Use

ST_IR_LOOP_TEST(in

BB Self Te sts) in Phoenix

FAIL

FAIL

FAIL

OK

Change

UEM(D200)

Replace faulty

component(s)

Use

ST_IR_IF_TEST(in

BB Sel f Tests) in

Phoenix

FAIL

OK

Measure Tx Data from

IR modu le (pin3 )

2.78V, 9.6/115.2kbps

UPP or UEM is faulty

Measure Rx Data from

OK

Change UEM

IR module(pin4)

OK

Phone OK

FAIL

Change IR module

Page 26 ãNokia Corporation Issue 1 11/02

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CCS Technical Documentation Troubleshooting

RF troubleshooting

Repairing instructions for RF Unit

Introduction

Measurements should be done using spectrum analyzer and high-frequency probe (Local
and reference frequencies and RF-power levels in intermediate stages of chain). Oscillo­scope is used to measure DC-voltages and low frequency signals. Multimeter is also use­ful measurement equipment in faultfinding. Also cellular tester is needed in order to
perform tests mentioned in this document.

External RF connector is implemented to design improving reliability of the measurement
results and should be in use when it is reasonable.

RF-section is mainly build around of SAFARI GTE IC (N801). The RF block has separate
external filters, UHF and VHF synthesizer, Power Amplifier, front-end and up converter
circuit for both frequency band.

To simplifying troubleshooting, this RF troubleshooting document is divides into three
bigger sections: Receiver-, Transmitter and Synthesizer parts. The tolerance is specified
for critical signals/voltages.

Before changing single ASICs or components, please check the following things:

1 The soldering and alignment marks of the ASICs

2 Supply voltages and control signals are OK

The PA-module is static discharge sensitive! ESD protection must be used when deal­ing with PA-IC (ground straps and ESD soldering irons). The PA is also moisture sensitive
components and it is important to follow additional information about handling the
component. So wear EDS protected clothes and shoes whenever handling the radio mod­ule unit! Also wrist-grounding strap should be used.

The shield lid must be always replaced with new one after it is opened. Plate bands under
shield lid could be cut but always bend plate ends downwards after repairing. Plate ends
should NOT touch shield lid after lid is installed. Note also that there are no short circuits
caused by plate ends on PWB.

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Troubleshooting CCS Technical Documentation

Abbreviations in fault finding chart

AF: Audio Frequency

BB Base band

BPF Band pass filter

f: Frequency of signal (measured with spectrum analyzer)

HB High band

LB Low band

LO Local Oscillator

P: Power of signal in decibels (dB) (measured with spectrum analyzer)

PA Power Amplifier

PWB Printed Wiring Board

PWRDET Power detector module

PLL Phase Locked Loop

RF Radio Frequency

RX Receiver

T: Time between pulses

TX Transmitter

U/C Up converter (mixer and driver in same package)

UHF Ultra High Frequency

V: Voltage of signal (measured with oscilloscope)

VCO Voltage controlled oscillator

VHF Very High Frequency

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CCS Technical Documentation Troubleshooting

Receiver

General instructions for RX troubleshooting

Receiver troubleshooting is divided into three sections:

- General checking

- Local oscillator checking

- RX Chain checking

Faultfinding charts are represented for each band and more detailed troubleshooting
instructions are included. Please note that before changing ASICs or filters, all solderings
and missing components must be checked visually. After any possible component
changes phone must be re-tuned using Phoenix.

Equipment needed for receiver troubleshooting:

- Signal generator up to 2 GHz

- Oscilloscope with 10x passive probe

- Spectrum analyzer and active probe without attenuation block

- PC with Phoenix SW

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Duplex filter

Duplex filter

Diplex filter

LNA

1900

LNA

850

Band

filter

Band

filter

1

st

mixer

1

st

mixer

GS

M

TDMA

AGC

AGC

2

nd

mixer

2

nd

mixer

BB filter

BB filter

AGC

AGC

Q

I

UHFLOVHF

LO

2063.4 ... 2124 MHz

AGC 1...31 dB, 5 steps

AGC

AGC

-

6...30 dB, 5 steps, GSM

AGC 25/20 dB 1 step

Troubleshooting CCS Technical Documentation

Path of the received signal

Block level description of the receiver:

Figure 14: Receiver block diagram

1930 ... 1990 MHz 869 ... 894 MHz

850 / 1900

133.2 MHz

BW

200 kHz

1900 MHz

850 MHz

134.04 MHz

ch filter

Buffer Buffer

BW

30 kHz

SAFARI GTE

1002.4...1028.01MHz
(VCO / 2)

ch filter

133.2 MHz (VCO / 2)

134.04 MHz (VCO / 2)

Page 30 ãNokia Corporation Issue 1 11/02

-6...36 dB, 7 steps, TDMA

QI

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CCS Technical Documentation Troubleshooting

AMPS

Fault finding chart

A pply signal to ext.

antenna connector

f= 881.4 M H z (ch 380)

mod.= 1004 Hz

dev.= 8 kHz

level= -116 dBm

Connect audio box

from the bottom

connector to audio

analyzer

SINAD < 12 dB

A pply signal to ext.

antenna connector

f= 881.409 MHz

(ch 380)

unmodulated

level= -50 dBm

Check signal level

at diplexer Z 908

input

SINAD > 12 dB

Not OK

AMPS RX is OK

Replace external

antenna connector

X900

OK

Check signal level

at duplex filter

Z906 input

Not OK

Replace diplexer

Z908

OK

Check signal level

at L N A _a input
coil pad (L 802)

Not OK

If coil L 802 is ok

replace duplex

filter Z906

OK

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Troubleshooting CCS Technical Documentation

Step 1. General checking

Check signal level

at RX band filter

Z801 input

OK

Check signal level

at mix1_A input

OK

Check signal level

at IF filter Z 803

input (134.04

MHz)

OK

Check signal level at

IF filter Z 803 output

(134.04 MH z)

Not OK

Not OK

Not OK

Not OK

Measure V R 4 from

Check components

Replace IF filter

these ok => replace

L812 and

L 811pads

Not OK

L 812,

L811 etc.

Z803

Check V R 4 supply

and components if

Safari N801

Replace RX band

filter Z 801

OK

Start synthesizer

troubleshooting

OK

Replace Safari N801

OK

Check signal level at

R X I/Q J808, J809,

J818, J819

OK

Check UEM and

start baseband

troubleshooting

Not OK

Start synthesizer

troubleshooting

OK

Replace Safari N801

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CCS Technical Documentation Troubleshooting

Audio test

Please use Phoenix RF-control to set phone to the correct operation mode.

Figure 15: RF Test

Enable audio using Phoenix software (maintenance -> testing -> audio test mode -> set
audio test mode). See picture below.

Figure 16: Audio Test

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Troubleshooting CCS Technical Documentation

Step 2. Local oscillator checking

Carrying out this step VCO signal of 1st and 2nd mixers can be checked. 2nd mixer RX
VHF VCO frequency is constant 268.08 MHz but for the 1st mixer UHF VCO frequency
depends on the channel. The UHF VCO frequencies for the 1st mixer are:

Channel 991: 2006.16 MHz

Channel 380: 2030.88 MHz

Channel 799: 2056.02 MHz

1 Set signal generator frequency to 881.4091125 and level to -80 dBm.

2 Set phone to TDMA mode and select RF Test UI in Phoenix (Maintenance => Test-

ing => RF Test).

Figure 17: RF Test.

3 Make sure that signal generator allows phone TX power going to its output. Use

low power level, for example 10. Set channel to 380 and select "Write Init".

4 Set spectrum analyzer settings as following:

• Center frequency: 268.08 MHz, Span: 200 kHz

• RBW: 3 kHz, reference level: 0 dBm

5 Connect spectrum analyzer probe on the inductor L818 and record RX VHF VCO

signal level and frequency. Signal level should be around -25 dBm and frequency

268.08 MHz.

6 Set spectrum analyzer settings as following:

• Center frequency: 2030.88 MHz, Span: 200 kHz

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CCS Technical Documentation Troubleshooting

• RBW: 3 kHz, reference level: 10 dBm

7 Connect spectrum analyzer probe to the UHF VCO output and record signal level

and frequency. Signal level should be around -5 dBm and frequency 2030.88
MHz.

Output

G802

8 Repeat measurement for channels 991 and 799.

Step 3. RX chain checking

1 Set signal generator frequency to 881.4091125 and level to -50 dBm.

2 Set phone to TDMA mode and select RF Test UI in Phoenix (Maintenance => Test-

ing => RF Test).

3 Make sure that signal generator allows phone TX power going to its output. Use

low power level, for example 10. Set channel to 380 and press "Write Init".

4 Connect oscilloscope probe to one of the RX I/Q test points on PWB (all four

testpoints J808, J809, J818 and J819 are located behind display)

5 Check that there is a clean signal in each test points.

6 Decrease signal level slowly down to -115 dBm and make sure that AGC keeps

signal in visible (This can be noticed by looking at the RX I/Q voltage during sig­nal level change).

7 Measure and record the frequency and peak-to-peak voltage of RX I/Q signal

from each test points. Voltage should be around 100 mVp-p and frequency 6.5
kHz +/- 3 kHz.

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K

K

p

K

Troubleshooting CCS Technical Documentation

TDMA800

Since there is same physical signal path for both analog (AMPS) and digital modes
(TDMA/GSM) in lower band there is no need for additional troubleshooting in digital
modes. If digital mode in lower band is not working properly start analog mode trouble­shooting.

GSM850

Figure 18: Fault finding chart.

Apply signal to ext.

antenna connector

f= 881.46771 MHz

(ch 189)

unmodulate

level= -80 dBm

Check signal level

at RX I/Q J808,

J809, J818, J819

Not OK

Check signal level

at diplexer Z908

input

Check signal level

at duplex filter

Z906 input

Check signal level

At LNA_a input
coil

ad (L802)

O

O

OK

Not OK

Not OK

Not OK

GSM850 RX is

OK

Replace external

antenna connector

X900

Replace diplexer

Z908

Replace duplex

filter Z906

O

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K

K

K

K

K

K

K

CCS Technical Documentation Troubleshooting

Step 1. General checking

Figure 19: General checking.

Check signal level

at RX band filter

Z801 input

O

Check signal level

at mix1_A input

O

Check signal level

at IF filter Z804

input (133.2 MHz)

O

Not OK

Not OK

Not OK

Measure VR4 from L815

and L814 pads

Not OK

Check components

L815,

L814 etc.

Check V R 4 supply
and components if

these ok => replace

Replace RX band

Safari N801

filter Z801

O

Start synthesizer

troubleshooting

OK

Replace Safari N801

Check signal level

at IF filter Z804

output (133.2

MHz)

Check signal level

at RX I/Q J808,

J809, J818, J819

Check UEM and

start baseband

troubleshooting

Not OK

O

Not OK

O

Replace IF filter

Z804

Start synthesizer

troubleshooting

O

Replace Safari

N801

The fastest way to get overview of RX status is to measure RSSI (Received Signal
Strength Indicator) level. This can be done by using signal generator and Phoenix. Note
that this is useful only if the phone has been calibrated when it was OK and the mal­function have occured after tunings.

1 Set signal generator frequency to 881.46771 MHz and level to -80 dBm.

2 Select RSSI measurement UI in Phoenix (Maintenance => GSM RSSI Meas).

3 Set Band to GSM850 and Rx/Tx channel to 189

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Troubleshooting CCS Technical Documentation

Figure 20: GSM RSSI Measurement.

If the cable losses are calibrated correctly the RSSI reading should give reasonable result
(-80 dBm +/- 2 dB). Please note that RSSI result is valid only if there has not been RX
calibration attempts for the faulty phone. If the RSSI level is several dB's lower go to
Step 2 (Local oscillator checking).

Step 2. Local oscillator checking

Carrying out this step VCO signal of 1st and 2nd mixers can be checked. 2nd mixer RX
VHF VCO frequency is constant 266.4 MHz but for the 1st mixer UHF VCO frequency
depends on the channel. The UHF VCO frequencies for the 1st mixer are:

Channel 128: 2004.8 MHz

Channel 189: 2029.2 MHz

Channel 251: 2054.0 MHz

1 Set phone receiver to continuous mode using Phoenix.

2 Set spectrum analyzer settings as following:

• Center frequency: 266.4 MHz, Span: 200 kHz

• RBW: 3 kHz, reference level: 0 dBm

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CCS Technical Documentation Troubleshooting

3 Connect spectrum analyzer probe on the inductor L818 and record RX VHF VCO

signal level and frequency. Signal should look like in the picture below:

Figure 21: RX VHF VCO signal level and frequency.

4 Set spectrum analyzer settings as following:

• Center frequency: 266.4 MHz, Span: 200 kHz

• RBW: 3 kHz, reference level: 0 dBm

5 Connect spectrum analyzer probe on the inductor L818 and record RX VHF VCO

signal level and frequency.

6 Set Rx/Tx channel to 189 using Phoenix.

7 Set spectrum analyzer settings as following:

• Center frequency: 2029.2 MHz, Span: 200 kHz

• RBW: 3 kHz, reference level: 10 dBm

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Troubleshooting CCS Technical Documentation

8 Connect spectrum analyzer probe to the UHF VCO output and record signal level

and frequency. Signal level should be around -5 dBm and frequency 2029.2 MHz.

Figure 22: UHF VCO.

Output

G802

9 Repeat measurement for channels 128 and 251.

Step 3. RX chain checking

1 Set signal generator frequency to 881.46771 MHz and level to -80 dBm.

2 Set phone receiver to continuous mode with full gain using Phoenix.

Figure 23: RF controls

3 Connect oscilloscope probe to one of the RX I/Q test points on PWB (all four

testpoints J808, J809, J818 and J819 are located behind display)

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CCS Technical Documentation Troubleshooting

4 Measure frequency and peak-to-peak voltage of RX I/Q signal from each test

points. Signal should look like in the picture below:

Figure 24: RX I/Q signal.

• If only one or two testpoints shows correct signal and rest of the testpoints are
either deaf or signal is very small, the fault is probably due to Safari ASIC.

• If the signal amplitude is correct but its frequency is something else than 67.71
kHz +/- 3 kHz, you may try to change AFC value (-1024...1023) and see does it
have effect to the frequency. Frequency should be tuned to target value with the
AFC value of +/- 100.

• If the signal amplitude and frequency in all testpoints is correct and signal
amplitude changes when the LNA, MIX2 and BB gains are changed, RX chain is
OK.

• If the signal amplitude in all testpoints is too low (< 1 Vp-p), you have to con­tinue with RX front-end measurements.

1 Set signal generator frequency to 881.46771 MHz and level to -60 dBm.

2 Set spectrum analyzer settings as following:

• Center frequency: 133.2 MHz, Span: 200 kHz

• RBW: 3 kHz, reference level: -20 dBm

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Troubleshooting CCS Technical Documentation

3 Set phone receiver to continuous mode with full gain using Phoenix (see figure

23, RF controls, in step 3).

4 Connect spectrum analyzer probe to the output of GSM IF filter (at the one end

of R804) and record the level.

5 Connect spectrum analyzer probe to the input of GSM IF filter (at the one end of

R803) and record the level.

• If the IF signal levels are according to the picture below and local oscillators are
OK (see step 2 Local oscillator checking) but RX I/Q signal is not correct (see step
3 to check RX I/Q signal) the problem is probably due to malfunction of either
2nd mixer or AGC blocks inside Safari.

• If the IF signal level is correct at the filter input but not at the output side the fil­ter shall be replaced with new one.

• If the IF signal level is not correct at the filter input side and the local oscillators
are functioning properly, inductors L814 and L815 should be checked, as well. If
they are OK and there is a signal at the input of the 1st mixer, the problem is
probably due to a faulty 1st mixer inside Safari.

Figure 25: IF signal level

LNA gain step function can be checked by measuring signal level at L806 and turning ON
and OFF the LNA using Phoenix. The gain should change by 20...30 dB.

TDMA1900

Only path from external RF connector to IF needs to be checked if AMPS/TDMA800/
GSM850 RX chain is OK. After down conversion (from RF to 134.04 MHz IF) both lower
and upper band use same signal path.

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T

X

CCS Technical Documentation Troubleshooting

Figure 26: Fault finding chart.

Apply signal to ext.

antenna connector

f= 1960.029 MHz ch

1000)

unmodulate

level= -50 dBm

Check signal level

at RX I/Q J808,

J809, J818, J819

Not OK

Check signal level

at diplexer Z908

input

OK

Check signal level

at duplex filter

Z962 input

OK

Check signal level
atLNA V804 input

OK

Check signal level

at RX band filter

Z 802 input

OK

Not OK

Not OK

Not OK

Not OK

DMA1900 RX is

OK

Replace external

antenna connector

900

Replace diplexer

Z908

Replace duplex

filter Z962

Check components

around lna and

measure supply

voltages

OK

Check signal level

at mix1_B input

OK

C ontinue

troubleshooting as

in

AMPS/TDMA800

Not OK

Replace RX band

filter Z802

Step 1. Local oscillator checking

Carrying out this step VCO signal of 1st and 2nd mixers can be checked. 2nd mixer RX
VHF VCO frequency is constant 268.08 MHz but for the 1st mixer UHF VCO frequency
depends on the channel. The UHF VCO frequencies for the 1st mixer are:

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Troubleshooting CCS Technical Documentation

Channel 2: 2064.12 MHz

Channel 1000: 2094.06 MHz

Channel 1998: 2124.00 MHz

1 Set signal generator frequency to 1960.0230375 MHz and level to -80 dBm.

2 Set phone to TDMA mode and select RF Test UI in Phoenix (Maintenance => Test-

ing => RF Test).

Figure 27: RF Test.

3 Set channel to 1000 and press "Write Init".

4 Set spectrum analyzer settings as following:

• Center frequency: 268.08 MHz, Span: 200 kHz

• RBW: 3 kHz, reference level: 0 dBm

5 Connect spectrum analyzer probe on the inductor L818 and record RX VHF VCO

signal level and frequency. Signal level should be around -25 dBm and frequency

268.08 MHz.

6 Set spectrum analyzer settings as following:

• Center frequency: 2094.06 MHz, Span: 200 kHz

• RBW: 3 kHz, reference level: 10 dBm

7 Connect spectrum analyzer probe to the UHF VCO output and record signal level

and frequency. Signal level should be around -5 dBm and frequency 2094.06

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Output

CCS Technical Documentation Troubleshooting

MHz.

G802

8 Repeat measurement for channels 2 and 1998.

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Troubleshooting CCS Technical Documentation

GSM1900

Figure 28: Fault finding chart

A pply signal to ex t.

antenna connector

f= 1960.06771 MHz

(ch 661)

unmodulated

level= -80 dBm

Check signal level

at RX I/Q J808,

J809, J818, J819

Not OK

Check signal level

at diplexer Z908

input

OK

Check signal level

at duplex filter

Z962 input

OK

Check signal level

atL N A V 804 input

OK

Not OK

Not OK

Not OK

G SM1900 RX is

OK

Replace external

antenna connector

X900

Replace diplexer

Z908

Replace duplex

filter Z962

OK

Chart is continued on the next page.

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CCS Technical Documentation Troubleshooting

Check signal level

at RX band filter

Z802 input

OK

Check signal level

at mix1_B input

OK

Check signal level

at IF filter Z804

input (133.2 MHz)

OK

Not OK

Not OK

Not OK

Measure V R4 from L 815

and L 814 pads

Not OK

C heck components

L 815,

L 814 etc.

Check components

around lna and

measure supply

voltages

Replace RX band

filter Z802

OK

Start synthesizer

troubleshooting

OK

Replace Safari N801

Check signal level

at IF filter Z804

output (133.2

MHz)

OK

Check signal level

at R X I/Q J808,

J809, J818, J819

OK

Check UEM and

start baseband

troubleshooting

Not OK

Not OK

Replace IF filter

Z 804

Start synthesizer

troubleshooting

OK

Replace Safari

N801

Issue 1 11/02 ãNokia Corporation Page 47

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Troubleshooting CCS Technical Documentation

Step 1. General checking

The fastest way to get overview of RX status is to measure RSSI (Received Signal
Strength Indicator) level. This can be done by using signal generator and Phoenix. Note
that this is useful only if the phone has been calibrated when it was OK and the mal­function have occured after tunings.

1 Set signal generator frequency to 1960.06771 MHz and level to -80 dBm.

2 Select RSSI measurement UI in Phoenix (Maintenance => GSM RSSI Meas).

3 Set Band to GSM1900 and Rx/Tx channel to 661

Figure 29: GSM RSSI Measurement.

If the cable losses are calibrated correctly the RSSI reading should give reasonable result
(-80 dBm +/- 2 dB). Please note that RSSI result is valid only if there has not been RX
calibration attempts for the faulty phone. If the RSSI level is several dB's lower go to
Step 2 (Local oscillator checking).

Step 2. Local oscillator checking

Carrying out this step VCO signal of 1st and 2nd mixers can be checked. 2nd mixer RX
VHF VCO frequency is constant 266.4 MHz but for the 1st mixer UHF VCO frequency
depends on the channel. The UHF VCO frequencies for the 1st mixer are:

Channel 512: 2063.4 MHz

Channel 661: 2093.2 MHz

Channel 810: 2123.0 MHz

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CCS Technical Documentation Troubleshooting

1 Set phone receiver to continuous mode using Phoenix.

2 Set spectrum analyzer settings as following:

Figure 30: RF controls.

• Center frequency: 266.4 MHz, Span: 200 kHz

• RBW: 3 kHz, reference level: 0 dBm

3 Connect spectrum analyzer probe on the inductor L818 and record RX VHF VCO

signal level and frequency. The result should be like in the picture below:

Figure 31: RX VHF VCO signal level and frequency

4 Set Rx/Tx channel to 661 using Phoenix.

5 Set spectrum analyzer settings as following:

• Center frequency: 2093.2 MHz, Span: 200 kHz

• RBW: 3 kHz, reference level: 10 dBm

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Troubleshooting CCS Technical Documentation

6 Connect spectrum analyzer probe to the UHF VCO output and record signal level

and frequency. Signal level should be around -5 dBm and frequency 2093.2 MHz.

Output

G802

The result should be like in the picture below:

Figure 32: UHF VCO signal level and frequency

7 Repeat measurement for channels 512 and 810.

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CCS Technical Documentation Troubleshooting

Step 3. RX chain checking

1 Set signal generator frequency to 1960.06771 MHz and level to -80 dBm.

2 Set phone receiver to continuous mode with full gain using Phoenix.

Figure 33: RF controls.

3 Connect oscilloscope probe to one of the RX I/Q test points on PWB (all four

testpoints J808, J809, J818 and J819 are located behind display)

4 Measure frequency and peak-to-peak voltage of RX I/Q signal from each test

points. Signal should look like in the picture below:

Figure 34: RX I/Q signal.

• If only one or two testpoints shows correct signal and rest of the testpoints are
either deaf or signal is very small, the fault is probably due to Safari ASIC.

• If the signal amplitude is correct but its frequency is something else than 67.71

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Troubleshooting CCS Technical Documentation

kHz +/- 3 kHz, you may try to change AFC value (-1024...1023) and see does it
have effect to the frequency. Frequency should be tuned to target value with the
AFC value of +/- 100.

• If the signal amplitude and frequency in all testpoints is correct and signal
amplitude changes when the LNA, MIX2 and BB gains are changed, RX chain is
OK.

• If the signal amplitude in all testpoints is too low (< 1 Vp-p), you have to con­tinue with RX front-end measurements.

1 Set signal generator frequency to 1960.06771 MHz and level to -60 dBm.

2 2) Set spectrum analyzer settings as following:

• Center frequency: 133.2 MHz, Span: 200 kHz

• RBW: 3 kHz, reference level: -20 dBm

3 Set phone receiver to continuous mode with full gain using Phoenix (see figure

33, RF controls, in step 3).

4 Connect spectrum analyzer probe to the output of GSM IF filter (at the one end

of R804) and record the level.

5 Connect spectrum analyzer probe to the input of GSM IF filter (at the one end of

R803) and record the level.

• If the IF signal levels are according to the picture below and local oscillators are
OK (see step 2 Local oscillator checking) but RX I/Q signal is not correct (see step
3 to check RX I/Q signal) the problem is probably due too malfunction of either
2nd mixer or AGC blocks inside Safari.

• If the IF signal level is correct at the filter input but not at the output side the fil­ter shall be replaced with new one.

• If the IF signal level is not correct at the filter input side and the local oscillators
are functioning properly, inductors L814 and L815 should be checked, as well. If
they are OK and there is a signal at the input of 1st mixer, the problem is proba­bly due to faulty 1st mixer inside Safari.

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CCS Technical Documentation Troubleshooting

Figure 35: IF signal level.

LNA gain step function can be checked by measuring signal level at L803 and turning ON
and OFF the LNA using Phoenix. The gain should change by 20...30 dB.

Transmitter

General instructions for TX troubleshooting

Always use an RF-cable connected from an external RF-connector to analyzer via (rf­power) attenuator. This is important to protect analyzer against excessive RF power and
not allow leakage of undesired RF power into cellular frequencies.

After any component change tune the phone with Phoenix auto tune SW.

AMPS/TDMA

Start Phoenix-software and select TX mode under testing (AMPS, DAMPS or TDMA1900).
It is useful to select mid channel (383 for AMPS/DAMPS or 1000 for TDMA1900) and
power level 2. Select random data for digital mode of operation.

GSM850

Start Phoenix-software and select GSM RF Control, Band GSM850, Active unit TX, PL7,
Ch189 and TX data type random.

GSM1900

Start Phoenix-software and select GSM RF Control, Band GSM1900, Active unit TX, PL0,
Ch661 and TX data type random.

Path of the transmitted signal

AMPS/DAMPS, GSM850

UEM TX I/Q DA-converters -> I/Q modulator and Digital gain step amplifier (SAFARI) ->
Dual TX IF-BPF -> Up converter (mixer -> C904 -> driver) -> BPF -> PA -> Power detec­tor -> Duplex-filter -> Diplexer -> EXT RF-connector -> Antenna

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Troubleshooting CCS Technical Documentation

TDMA1900, GSM1900

UEM TX I/Q DA-converters -> I/Q modulator and Digital gain step amplifier (SAFARI) ->
Dual TX IF-BPF -> Up converter (Mixer -> BPF -> Driver) -> BPF -> PA -> Power detector

-> Duplex-filter -> Diplexer -> EXT RF-connector -> Antenna

The power detection and power control circuit belongs under power control part of this
guide.

Figure 36: TX signal path.

1900

UHF-PLL 2G (÷2)

(2063.4-2124 MHz, HB)

D

I

P

800

D
E

T

1900MHz

800MHz

1900MHz

800MHz

(1003.08-1028.01 MHz,LB)

213.2 MHz

214.08 MHz

178.2 MHz

179.04 MHz

DIV

2

VHF-PLL

356.4 MHz

358.08 MHz

426.4 MHz

428.16 MHz

VHF

VCO

I

Q

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CCS Technical Documentation Troubleshooting

Fault finding charts for transmitter

AMPS

Start Phoenix-software and set phone to the Analog mode. Set channel 383 and Power
level 2. Connect RF-cable to Ext RF connector and connect cable to Spectrum analyzer
input and measure RF level. Please notice insertion loss of the cable and attenuations.

Figure 37: RF Test.

Figure 38: RF controls.

Issue 1 11/02 ãNokia Corporation Page 55

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Troubleshooting CCS Technical Documentation

Figure 39: Fault finding chart

AMPS,PL2, CH383

Visual check of TX

block

- PA and up converter

-TX SAW

- Duplex filter

- Passive components
OK

*)Check LO-signal

(1015.53MHz)

@L979&L980

and TX VHF (358.08

MHz)@N811

OK

Check supply voltages:

VR2,VBATTRF,

VR5, IPA1,BANDSEL,

TX_ENABLE

TX_GAIN_CONTROL

OK

Check T Xi/q signals

Test points J810...J811

OK

**)Check TX IF power

(179.04 MHz) @

C931&C932

Input: -17 dBm

+3 /-6 dB

NOK

NOK

NOK

NOK

Start synth

troubleshooting

Check UEM and UPP

(Baseband)

Check UEM
(Baseband)

Change SAFARI

N801

OK

***)Check TX RF

(836.49 MHz) output

power @ U/C output

RF: -5 dBm +/- 6dB

OK

NOK

1) Check C904

2) Change
U/C N902

Page 56 ãNokia Corporation Issue 1 11/02

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CCS Technical Documentation Troubleshooting

Check TX SAW

input an d output power

IL: 3 dB

OK

****)Is Itot 680 ... 1000

mA?

Check PA output power

and gain.

Output power: ~2 8 dBm

Gain: ~30 dB

OK

Check PW RDET N900

insertion loss

IL<0.3 dB

OK

NOK

Change TX SAW filter

Z905

NOK

Change PA N901

NOK

Change PW RDET

N900

Check duplexer Z906,
diplexer Z908 and RF

connector X90 0

Dupl IL: ~2.2 dB

Dipl IL: ~0.35 dB

RF conn: ~0.1 dB

OK

Start Power control

troubleshooting

NOK

Change Z906 or Z908

or RF connector

*) GSM850 LO-signal freq. 1014.6 MHz and TX VHF-signal freq. 356.4 MHz

**) GSM850 TX IF freq. 178.2 MHz and level –17 dBm

***) GSM850 TX RF freq. 836.4 MHz and level 0 dBm

****) GSM850 Itot 170 – 300 mA

Issue 1 11/02 ãNokia Corporation Page 57

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Troubleshooting CCS Technical Documentation

TDMA800, GSM850

The transmitter chain is exactly same as the AMPS mode, except for the IPA current, and
thus it is important that the AMPS circuitry has no faults.

TDMA1900, GSM1900

TDMA1900 and GSM1900 mode and DAMPS mode have a common RF modulator and
thus it is important that DAMPS mode have no faults.

Figure 40: TDMA1900.

Figure 41: GSM1900.

Page 58 ãNokia Corporation Issue 1 11/02

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CCS Technical Documentation Troubleshooting

Figure 42: Fault finding chart

TDMA1900, PL2, CH1000
GSM1900, PL0, CH6 61

NOK

Is TDMA800 mode

OK?

OK

Start AMPS

troubleshooting

Check LO-signal

(TDMA 2094.06 GSM

2093.2MHz)@L979&L98
0andTXVHF
(TDMA 428.16

GSM 4 26.4 MHz)@N811

OK

Check supply voltages:

VR2,VBATTRF,

VR6, IPA2,BANDSEL,

TX_ENABLE

TX_GAIN_CONT RO L

OK

Check TX IF input

power (T DMA 214.08

GSM 2 13.2 MHz) @

C931&C932

IF:-12 dBm +6/-6dB

OK

Check TX RF (TDMA

1879.98 GSM 1880

MHz) U/C output power

@ Z961 input

TDMA +4 dBm +/- 6dB

GSM +8 dBm +/- 6dB

NOK

NOK

NOK

NOK

Start synth

troubleshooting

Check UEM and UPP

(Baseband)

Change SAFARI N801

or Z901

1) Che ck Z96 0 input
and output power

IL: -3 dB

2) C han ge U/C N902

OK

Check Z961 input and

output power

IL: -3dB

OK

NOK

Change Z961

Issue 1 11/02 ãNokia Corporation Page 59

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Troubleshooting CCS Technical Documentation

Is Itot TDMA 350...500

GSM200 ... 300 mA?

CheckPA output power

and gain. Gain: ~30 dB

Pout:TDMA ~29 dBm

GSM~32 dBm

OK

CheckPWRDET N900

insertion loss

IL< 0.3 dB

OK

Checkduplexer Z962 ,

diplexer Z908 and RF

connector X900

insertion loss

Dupl IL ~2.2 dB

Dipl ~0.35 dB

RF conn ~0.1 dB

NOK

Change PA N901

NOK

Change PWRDET

N900

NOK

Change Z962 or Z908

or RF connector

OK

Start Powercontrol

troubleshooting

Page 60 ãNokia Corporation Issue 1 11/02

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t

CCS Technical Documentation Troubleshooting

Power control loop

Basically, the power detection is done with Power detector module and power control is
done inside SAFARI. Power detection is similar for both bands, except both bands have
own coupler.

Figure 43: Power detection.

Note !
See TXPWRDET vs. Outpu

power curve

Is TXPWRDET vs.

output power OK?

See chart below.

Y

Is DAC value vs.

TXPWRDET (mV)

OK?

N

N

Check VR2 and

PATEMP .

Check C921, C922

and PWRDET

module.

Check UEM
(BaseBand)

The detected voltages are illustrated in the following table and diagram.

AMPS AND TDMA

TXPWRDET values can be checked with Phoenix autotuning.

Table 3: TYPICAL DETECTED VOLTAGES AT POWER LEVELS PL2…PL10

800A 800D 1900

D

Pout TXPWRDET Pout TXPWRDET Pout TXPWRDET
PL dBm dac mV dBm dac mV dBm dac mV
2 25.7 450 27.3 27.3 503
3 23.3 301 23.3 23.3 304
4 19.3 179 19.3 19.3 182
5 15.3 107 15.3 15.3 105
6 11.1 60 11.1 11.1 57
7 7.0 33 7.0 7.0 30
8 - - - 3.0 18 3.0 15
9 - - - -1.0 8 -1.0 6
10 - - - -5.0 3 -5.0 2

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Troubleshooting CCS Technical Documentation

GSM850/GSM1900

GSM detected voltages and DAC values are also OK if AMPS and TDMA values are OK.

NOTE: DAC VALUES MAY VARY ABOUT +/- 20%NOTE: TXPWRDET is difference between TX
on burst and off burst.

Table 4: Typical detected voltages at power levels PL0...PL19.

Pout TXPWRDET Pout TXPWRDET,

U_value
PL dBm dac mV dBm dac mV
0 - - 29.5
1 - - 28
2 - - 26
3 - - 24
4 - - 22
5 - - 20
6 - - 18
7 29.5 16
8 27 14
9 25 12
10 23 10
11 21 8
12 19 6
13 17 4
14 15 2
15 13 0
16 11 - ­17 9 - ­18 7 - ­19 5 - -

Page 62 ãNokia Corporation Issue 1 11/02

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CCS Technical Documentation Troubleshooting

Synthesizers

There are five oscillators generating the needed frequencies for RF section. 19.2 MHz ref­erence oscillator, 2GHz UHF VCO, TX VHF cascade amplifier VCO both RX VHF VCO and
BB VHF integrated in Safari. RX VHF frequency is 268.08 MHz in TDMA and 266.4 MHz in
GSM and TX VHF has four fixed frequencies, 358.08 MHz TDMA and 356.4 MHz GSM for
lowband and 426.4 MHz in GSM and 428.16 MHz in TDMA upper band. VCO's operating
frequencies are controlled by PLL-circuit of SAFARI. All locals are locked to a stable 19.2
MHz reference oscillator.

The frequency range for 2GHz UHF VCO is: 2004.8 … 2124 MHz. The output frequency
range for the lower band is from 2006.16 to 2056.02 MHz in TDMA and from 2004.8MHz
to 2054 in GSM. In TDMA upper band the output frequency range is from 2064.12 MHz
to 2124 MHz and GSM 2063.40 to 2123 MHz.

BB-PLL frequencies are in TDMA 77.76 MHz and in GSM 78 MHz

It is a practical way to check out synthesizer status by measuring the control voltage of
the VCO from Integrator capacitor. If the voltage is stable and reasonable, local oscilla­tors are running correctly.

19.2 MHz reference oscillator

The 19.2 MHz oscillator frequency (G801) is controlled by UEM. This 19.2 MHz signal is
connected thru SAFARI to PLL-circuits.

All synthesizers use divided VCTCXO signal as a reference signal for Phase locked loop to
provide correct LO-frequency.

BB-PLL provides to the BB needed clock signals.

Issue 1 11/02 ãNokia Corporation Page 63

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Troubleshooting CCS Technical Documentation

Figure 44: Fault finding chart for 19.2 MHz oscillator

2

Change

VCTCXO

OK

2.No

START HERE!

Is VCTCXO

oscillating?

19.2MHz

C867

2.78 V

No

R816

OK

1

OK

1.No

Check voltage

Check resistor

OK!

Page 64 ãNokia Corporation Issue 1 11/02

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CCS Technical Documentation Troubleshooting

RX VHF VCO

The RX VHF VCO signal is used to generate receiver Intermediate frequency. RX VHF VCO
has two fixed frequencies: TDMA 268.08 MHz, GSM 266.4 MHz. Operating frequency is
locked in Phase locked Loop.

RX VHF VCO output signal is fed to SAFARI. Inside the SAFARI signal is divided for Phase
detector and RX parts. Before I/Q-modulator frequency is divided by 2.

Fault finding chart for RX VHF VCO

Note! Measure oscillator frequency over L818 coil. Don’t connect probe to pads!

AMPS/TDMA -> RX VHF frequency 268.08 MHz

GSM -> RX VHF frequency 266.4 MHz

Figure 45: Fault finding chart for RX VHF VCO.

4

3

Check loopifilter

components:

C848, R808, C847,

R807, C846, R820, C870

check also R826

OK

3.No

Change
SAFARI

No

1 START HERE

Is oscillator locked

to TDMA 268.08

or GSM 266.4

OK

MHz

2.No

Check resonator

OK

2

components:

Yes

OK!

V801, C845, C871,

L818 and DC block C821

Issue 1 11/02 ãNokia Corporation Page 65

RH-13

RFCLK to BB

*Data are related to vctcxo frequency and mode selections.

Troubleshooting CCS Technical Documentation

BB PLL

The BB PLL generates RF clock to base band. It has two fixed frequencies 77.76 MHz in
TDMA mode and 78 MHz in GSM mode. Next picture shows BB PLL working.

Figure 46: BB PLL.

VCTCXO

Divider

65 or 80

*Data

RF-IC

19.2 MHz

Freq/Phase

comparator

Divider

324 or 325

Divider 4 or 6

Charge Pump

Active
part

BB VCO

Loop Filter

Varactor
Resonator

GSM 13 MHz
TDMA 19.44 MHz

Page 66 ãNokia Corporation Issue 1 11/02

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CCS Technical Documentation Troubleshooting

Fault finding chart for BB PLL

Note! Measure oscillator frequency over L829 coil. Don’t connect probe to pads!

TDMA -> BB PLL frequency 77.76 MHz

GSM -> BB PLL frequency 78 MHz

Figure 47: Fault finding chart for BB PLL.

4

Change
SAFARI

3

Check loopfilter

components:

C878, R834, C881,

R835, C882

OK

3.No

No

1 START HERE

Is o scillator locked

to TDMA 77.76 or

GSM 78 MHz

OK

2.No

Check r esonator

OK

2

components:

V805, C855,

L829 and C893

Yes

OK!

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Troubleshooting CCS Technical Documentation

TX VHF VCO

The TX VHF VCO signal is used to generate transmitter Intermediate frequency. TX VHF
VCO has three fixed frequencies 358.08 MHz for lower band and TDMA 428.16 MHz and
GSM 426.4 MHz for upper band. Operating frequency is locked in Phase locked Loop and
frequency is divided by two before modulator.

Fault finding chart for TX VHF VCO

AMPS, CH383 -> TX VHF frequency 358.08 MHz

TDMA1900, CH1000 -> TX VHF frequency 428.16 MHz

GSM850, CH189 -> TX VHF frequency 356.4 MHz

GSM1900, CH661 -> TX VHF frequency 426.4 MHz

Figure 48: Fault finding chart for TX VHF VCO.

4

Check components:
C853, C852, C851,

R810, R809, R821 and

C841, C873, L828

3

Check resonator

components:

V802, C850, L820,

C874, C865

4.No

OK

3.No

Change

cascade amplifier

OK

Is oscillator locked

5.No

1 START HERE

to 356.4, 358.08,

426.4

or 428.16 MHz

2.No OK

Check operating

voltage:

4.75 V

at R833

5

N811

2

OK

6.No

Yes

No

OK

OK

6

Change
SAFARI

OK!

Check:

L819, R833

Page 68 ãNokia Corporation Issue 1 11/02

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CCS Technical Documentation Troubleshooting

UHF SYNTHESIZER

The UHF synthesizer consists of a external 2GHz UHF VCO, loop filter and integrated PLL
in Safari RF-IC. Safari GTE IC contains stages like counters, prescaler, divider by two,
phase and frequency comparator and a charge pump circuit which allows two opera­tional modes analog and digital. The UHF VCO Oscillation frequency is from 2004.8 MHz
to 2124 MHz

In upper band (TDMA1900 &GSM1900) 2 GHz synthesizer frequency is fed straight to
mixers. In lower band case (AMPS, TDMA800 and GSM850) 2 GHZ UHF VCO frequency
signal is first divided by 2 inside SAFARI and then that divided signal is fed to mixers. The
output frequency of the VCO depends on the DC-control voltage which is controlled by
PLL-circuit inside SAFARI.

Figure 49: Fault finding chart for UHF SYNTHESIZER.

Change

VCO G802

2. No

OK

Checkloopfilter

components and

balun T 8 01,

C863,C862,C861,

C860,R806,

R815,R814,R813

OK

3.

No

START HERE!

Is frequency locked?

2004.8 - 2124
MHz

1.
OK

No

Check VCO

operatig

voltage:

2.78 V

Yes

No
OK

4. No

Is EVM OK?

OK

No

1

Check

loopfilter

components

Check resistor

R811

Change

SAFARIN801

No

YES

low

band

Low band:
Is divided

signal OK?

OK!

Yes

No

Issue 1 11/02 ãNokia Corporation Page 69

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Troubleshooting CCS Technical Documentation

Description of RH-13 RF auto-tune tunings

TDMA RF tunings

Figure 50: Auto tune TDMA

TDMA RX tunings

AFC-Tuning

Purpose of the tuning is to correct phone frequency error

If AFC-tuning fails it might be fue to:

- Problems with lower band signal path, synthesizer etc.

- If AFC DAC tuning value or step size is too low or high it might be due to faulty VCTCXO
component.

- (UEM)

- (UPP)

RX LP and AMP2 filter tunings

- Tuning results are only visible after an unsuccessful auto-tune procedure

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CCS Technical Documentation Troubleshooting

- This tuning has to be done simultaneously with AFC-tuning

If LP and AMP2 filter tunings fail it may be due to:

- Problems with lower band signal path (synthesizer etc.)

- VCTCXO component can be broken

- Safari can be broken or solder joints

UB RX AGC tuning

- UB TDMA minimum gain (around 0 dB), measured when lna is switched off

- UB LNA gain step, measured when lna is switched on. Result is gain difference between
lna on and off (around 20 dB)

- If UB TDMA minimum gain is lower than -2 further analysis is needed. Result 32752
means that the signal doesn't go through RX chain at all or it has a lot of attenuation.

If it fails there can be following problems:

- Rx chain is totally deaf or some gain is missing, start receiver troubleshooting

LB RX AGC tuning

- LB TDMA minimum gain (around 2 dB), measured when lna is switched off

- LB LNA gain step, measured when lna is switched on. Result is gain difference between
lna on and off (around 20 dB)

- If LB TDMA minimum gain is lower than -2 dB, further analysis is needed. Result
32752 means that the signal doesn't go through RX chain at all or it has a lot of attenu­ation.

If it fails there can be following problems:

- Rx chain is totally deaf or some gain is missing, start receiver troubleshooting

TDMA TX tunings

If some TX tunings fails, start always TX troubleshooting!

TX IQ (TxIq)

- Purpose of the tuning is to tune DC offset and phase offset so low as possible (test limit
–40 dBc)

If tuning fails there can be following problems:

Issue 1 11/02 ãNokia Corporation Page 71

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Troubleshooting CCS Technical Documentation

- UEM or Safari

- Too low output power

TX power levels and crossband (TxPwr)

- Purpose of this tuning is to tune all power levels (PL2 – PL10)

- TX crossband:

- Low band: Purpose is to tune high channel power (ch991) and low channel power
(ch799) equal to mid channel power (ch383).

- Upper band: Purpose is to tune high channel power (ch2) and low channel power
(ch1998) equal to mid channel power (ch1000).

- Crossband tuning is done only with PL2

If tuning fails there can be following problems:

- Broken component: PA, Safari, up converter, some filters

- Missing components

GSM RF tunings

Figure 51: Auto-tune GSM

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CCS Technical Documentation Troubleshooting

GSM RX tunings

LP and AMP2 filters tunings

- This is done using Safari internal loop. No external signal is needed

If it fails there can be following problems:

- Safari problem

GSM AFC tuning

- Purpose of the tuning is to correct phone frequency error

If AFC tuníng fails it might be due to:

- Problems with upper band signal path (synthesizer etc.)

- VCTCXO component can be broken

- (UEM)

- (UPP)

GSM UB LNA GAIN AND RSSI OFFSET

- UB GSM reference gain (around 74 dB), measured when lna is switched off

- UB LNA gain step, measured when lna is switched on. Result is gain difference between
lna on and off (around 21 dB)

If it fails there can be following problems:

- Rx chain is totally deaf or some gain is missing, start receiver troubleshooting

GSM LB LNA GAIN AND RSSI OFFSET

- UB GSM reference gain (around 77 dB), measured when lna is switched off

- UB LNA gain step, measured when lna is switched on. Result is gain difference between
lna on and off (around 20 dB)

If it fails there can be following problems:

- Rx chain is totally deaf or some gain is missing, start receiver troubleshooting

RX temperature calibration

- NTC resistor calibration in ambient temperature

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Troubleshooting CCS Technical Documentation

If NTC temperature fails it might be due to:

- Faulty NTC resistor or pull-up resistor

- faulty UEM

- wrong ambient temperature (phone is too hot or cold)

GSM RX CROSS BAND CALIBRATION

- Purpose of the calibration is to compensate gain ripple due to rx-filters over the band

- This is done in UB and LB

If it fails, response over the band can be very bad and there can be following problems:

- Please check that all components are ok and in place around rx-parts

- Please check that filters are ok

GSM TX tunings

If some TX tuning fails, start always TX troubleshooting!

TX IQ

Purpose of this tuning is to tune DC offset and phase offset so low as possible

- Typical values: Amplitude: -45 to –55 dBc, and Phase: –50 to – 60 dBc

If tuning fails there can be following problems:

- UEM or Safari

- Too low output power

TX Power levels

Purpose of this tuning is to tune all power levels GSM1900 (PL0 – PL15)
and GSM850 (PL7 – PL19)

If tuning fails there can be following problems:

- Broken components: PA, Safari, up converter, some filters

- Missing components

TX crossband

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CCS Technical Documentation Troubleshooting

- GSM1900: Purpose is to tune high channel power (ch512) and low channel power
(ch810) equal to mid channel power (ch661).

- GSM850: Purpose is to tune high channel power (ch128) and low channel power
(ch251) equal to mid channel power (ch189).

Typical values:

- Low Comp Factor UB 0.5, LB 0.5

- High Comp Factor UB 1.0, LB 1.5

PA TROUBLESHOOTING FOR SALIERI

This document has been done to get exact information of defect PA. In case is excessive
current consumption is found during normal trouble shooting, follow this trouble shoot­ing instructions to find out, if the reason is PA. If the failure is due to PA, change the PA
and replace the removed components.

- if the short is on VBATT line, the current consumption goes to maximum provided from
the power supply

- if it is after UEM then the current is high but not maximum.

Compare the current consumption with a working phone.

NOTE! To get specified current readings, turn module jig MJS-17 switches 2 and 3 ON for
local mode.

Issue 1 11/02 ãNokia Corporation Page 75

RH-13

N901 1900

N901 850

N901 850

VCC1/VCC2

N901 1900

VCC1/VCC2

No

No

No

No

and check if phone takes

Remove Coil

L903.Current

Remove Coil

L905.Current

Remove Coil

L977.Current

Remove Coil

L978.Current

Troubleshooting CCS Technical Documentation

Figure 52: Fault finding chart

Put the phone PWB in
the module jig MJS-17

toomuchcurrent.Do
not power on.

Yes

PA OK. Check
UEM = BB
troubleshoot.

Yes

Yes

Yes

Report t o additional notes.

VCC3 short.

VCC3 short.

Page 76 ãNokia Corporation Issue 1 11/02