This section is a summary of experiences the NPE-4 R&D team made during the development. It covers some errors or wrong configurations and their symptoms as well as
advice for problem solving. The section is seperated into two main parts the Baseband
troubleshooting and the RF troubleshooting, however, it is advisable to read both parts.
Baseband Troubleshooting
Phone is dead
This means that the phone does not use any current at all when supply is connected and/
or powerkey is pressed.
It is assumed that the voltage supplied is 3.6 VDC. The UEM will prevent any functionality what so ever at battery/supply levels below 2.9 VDC.
OriginalãNokia Corporation.Page 6-5
NPE-4
6 - TroubleshootingPAMS Technical Documentation
Phone is dead
Yes
L260 towards SIM connector,
VBAT = 3.6 VDC
Yes
L261 towards C261,
L262 towards C262,
L265 towards C265
voltage = 3.6 VDC
Yes
Pin 2 and 4 on S300 = 0 VDC
when powerkey pressed
Yes
Sleep clock on J404
~32.768 Hz, 1.8 Vpp
Yes
PURX = 1.8 VDC on V130
(Bluetooth module) pin44
~1 sec. after power key is
pressed
No
No
No
No
No
Failure in VBAT
line, check:
X101, X102
Check:
L261,L262,L263,
C261,C262,C265
Check:
S300, PWB
Check:
B200,C209,C210,
D200,PWB
Check:
D200, PWB
Yes
VR3 ~2.78 VDC on C295
towards D200 (UEM)
Yes
13 MHz clock min 300
mVACpp on C424 towards
D200 with regular probe Cin
~10-13 pF/10M
Yes
Check:
D400 (UPP),D450 (FLASH)
No
No
Check:
D200,C295,PWB
Check:
C424,C425,L420,
C420,R420,N600
(HAGAR)
Page 6-6ãNokia Corporation.Original
NPE-4
PAMS Technical Documentation6 - Troubleshooting
Flash programming doesn’t work
The flash programming can be done via the pads on the PWB or via system connector
X100.
In production, the first programming is done via the pads on the PWB.
The main differences between these are:
a) Flash programming voltage is produced different way.
b)Signal routings are different.
In case of Flash failure in FLALI station, problem is most likely related to SMD problems.
Possible failures could be Short circuiting of balls under µBGAs (UEM, UPP, FLASH). Missing or misaligned components.
In flash programming error cases the flash prommer can give some information about a
fault.
The fault information messages could be:
- Phone doesn't set FBUS_TX line low
The preliminary fault-finding diagrams for flash programming are shown in the next
page.
Because of the use of uBGA components it is not possible to verify if there is a short circuit in control- and address lines of MCU (UPP) and memory (flash).
OriginalãNokia Corporation.Page 6-7
NPE-4
6 - TroubleshootingPAMS Technical Documentation
Flash programming
Flash programming doesn't work
If fault information from Prommer is:
Phone doesn't set FBUS_TX line low
Yes
Check the connections:
X100 p11 - R101
X100 p12 - R104
X100 p13 - R100
Connection ok?
Yes
Try reading MCU ID
with Phenix
Reading ok?
Yes
Try reading Flash ID with
Phenix
reading ok?
Yes
Flash again
No
Solder / replace faulty
component
No
Replace either UEM or UPP
No
Replace Flash
Power doesn’t stay on, or phone is jammed
If this kind of failure is presenting itself immediately after FLALI, it is most likely caused
by ASICs missing contact with PWB.
If for some reason the MCU does not service the watchdog register within the UEM, the
operations watchdog will run out after approximately 32 seconds. Unfortunately, the
service routine can not be measured.
Page 6-8ãNokia Corporation.Original
NPE-4
PAMS Technical Documentation6 - Troubleshooting
Power doesn't stay on or
phone is jammed
Yes
Sleep clock on J404
~32.768 Hz, 1.8 Vpp
Yes
PURX = 1.8 VDC on V130
(Bluetooth module) pin44
~1 sec. after power key is
pressed
Yes
UI functionality and keys react
to pressure
Yes
13 MHz clock min 300
mVACpp on C424 towards
D200 with regular probe Cin
~10-13 pF/10M
Yes
TBA
No
No
No
No
Check:
B200,C209,C210,
D200,PWB
Check:
D200,PWB
Check:
D400,D450,Z300,
Keymat,
Lightguide,PWB
Check:
C424,C425,L420,
C420,R420,N600
(HAGAR)
Display Information: “Contact Service”
When this error appears in the display, it means that one or more of the internally Baseband tests has failed. The Baseband tests (selftests) are performed each time the phone is
powered on. The selftests are devided 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:
UPP Register verfication test.
UEM CBUS Interface test.
SleepX loop test.
Aux. Data loop test.
Ear Data loop test.
Tx IDP loop test.
Tx IQ DP loop test.
SIM Clock loop test.
If all these selftests are passed, the phone will start-up.
From Phoenix it is possible to run all the selftest and the additional "Runtime test". The
test cases can be seen below.
Page 6-10ãNokia Corporation.Original
NPE-4
PAMS Technical Documentation6 - Troubleshooting
The phone doesn’t register to the network or phone doesn’t make a call
If the phone doesn't register to the network, the fault can be in either BB or RF. Due to
the highly module design of the BB area, very few signals can be measured.
Phone doesn't register to network
or phone doesn't make a call
Yes
C292 towards D200 (UEM) ~4.75 VDC
C294 towards R308 ~2.78 VDC
C295 towards UEM ~2.78 VDC
C296 towards V311 ~2.78 VDC
C297 towards UEM ~2.78 VDC
C298 towards R307 ~2.78 VDC
C299 towards V311 ~2.78 VDC
C288 towards R306 = 1.35 VDC
C289 towards UEM = 1.35 VDC
all during GSM frame. Use TXP on J760.
No
Check:
D200, D400,PWB
Yes
Check RF serial bus:
RFBUSCLK on J731/J735
RFBUSDA on J732/J76
RFBUSEN1X on J730/J734
Transitions "1" <-> "0",
1.8 VDC <-> 0 VDC during GSM frame
Yes
Check analog signals during
GSM frame (Rx slot):
RXINP on C724 towards C716 = 0-1.45 VDC
RXQINP on C725 towards C716 = 0-1.45 VDC
Yes
Check analog common mode signals during
GSM frame (Tx slot):
TXIOUTP on R764 pin 1 towards R766 and
TXIOUTN on pin 3 = 1-1.75 VDC
TXQOUTP on R766 pin 1 towards R764and
PXQOUTN on pin 3 = 1-1.75 VDC
Yes
No
No
No
Check:
D400,PWB
Check:
D200,D400,PWB
Check:
D200,D400,R764,
R766,PWB
Check RF
SIM Failure
The hardware of the SIM interface from UEM (D200) to the SIM connector (X386) can be
tested without a SIM card. When the power is switched on the phone first check 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".
OriginalãNokia Corporation.Page 6-11
NPE-4
6 - TroubleshootingPAMS Technical Documentation
The error ”SIM card rejected” means that the ATR message received from 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.
SIM Fault
Measure
VSIM at
X386. Is it
3V?
Yes
Check SIM power-up
sequence
Check SIM
NoNo
reader X386
Measure
VSIM at
C302. Is it
3V?
Yes
Replace R388
UEM FAILURE
VSIM
Reset
Clock
Data
Page 6-12ãNokia Corporation.Original
NPE-4
PAMS Technical Documentation6 - Troubleshooting
Display Failure
Display
Fault
Is
display
working
Yes
No
Change
display
module
Is
display
working
Yes
No
Measure
Vflash1 is
2,78V
Yes
Measure
Vio is
1,8V
Turn phone off and
No
No
ohm measure
between Vflash1
and ground.
UEM FAILURE
Turn phone off and
ohm measure
between Vio and
~46k ohm
ground.
0 ohm
0R
Check C239, C279,
C304, C309, C350
R174, R202 and R352.
Check C207, C218,
C303, C404, C405,
C450, C451 and R173.
OK
Measure
Vout at
C302 is
~10,7V
UPP FAILUREEND
Yes
Yes
UEM FAILURE
No
Check C302
~510k ohm
OK
OK
OriginalãNokia Corporation.Page 6-13
NPE-4
6 - TroubleshootingPAMS Technical Documentation
Keypad Failure
Power key failure
Keypad
fault
Power Key
OK?
Yes
No
Voltage on S300
approx = Vbat
Yes
Voltage on S300
while pressed
approx = Vbat
Yes
S300 ok ?
No
No
No
Check C312 and
Z300
If Ok ->
UEM fail
Phone
jammed
Change S300
Yes
Keypad
fault 2
Page 6-14ãNokia Corporation.Original
Phone
dead
NPE-4
PAMS Technical Documentation6 - Troubleshooting
Volume key failure
Keypad
fault 2
Volume UP key
OK?
Yes
Volume DOWN key
OK?
No
No
Check S301 with
Ohmmeter
S301 short?
Yes
Check S302 with
Ohmmeter
S302 short?
No
No
Replace S301
If still fail
Replace Z300
If still fail->
UPP failure
Replace S302
If still fail
Yes
Keypad
fault 3
Yes
Replace Z300
If still fail->
UPP failure
OriginalãNokia Corporation.Page 6-15
NPE-4
6 - TroubleshootingPAMS Technical Documentation
Keyboard failure
Keypad
fault 3
Keyboard
OK?
Yes
END
No
Replace light guide
OK now?
Yes
END
No
Replace Z300
if still fail ->
UPP failure
Page 6-16ãNokia Corporation.Original
NPE-4
PAMS Technical Documentation6 - Troubleshooting
Audio faults
Earpiece doesn't work
and there isn't any
mechanical problem
Replace Earpiece
Ok
Check L158, R171 (and
C150 and R156 for
Shortcircuit)
Ok
UEM FAILURE (D200)
Headset microphone doesn't work
and there isn't any
mechanical problem
Microphone doesn't work
and there isn't any
mechanical problem
Replace Microphone
Ok
R150 towards UEM (bias) = 2.1VUEM FAILURE (D200)
R151 towards miclines (bias) = 1.0-
Check MIC line to UEM:
L155, R153,C156, C155, R151,
Ok
Yes
1.4 V
Yes
C154, R152
No
Check R150, R151,
No
V158, C151, C153,
C152
Ok
UEM FAILURE (D200)
R162 towards UEM (bias) = 2.1VUEM FAILURE (D200)
R163 towards miclines (bias) = 0.8-
Check XMIC line to UEM:
L168, R167, C168, C167, C166,
C165, R166, C164, R165
Ok
Yes
1.4 V
Yes
No
Check R162, R163,
No
V151, C160, C162,
Ok
UEM FAILURE (D200)
C161
OriginalãNokia Corporation.Page 6-17
NPE-4
6 - TroubleshootingPAMS Technical Documentation
Headset earpiece doesn't work
and there isn't any
mechanical problem
With headset connected,
measure C177 and C178
towards UEM - DC level 0.8V.
Press keypad tone 5 and
measure with oscilloscope. An
AC signal pressents.
OK
Not OK
UEM FAILURE
Buzzer doesn't work
and there isn't any
mechanical problem
Measure C158 towards N150
with an oscilloscope. Same
AC signal present (higher
level).
OK
Measure R179 towards UPP
- DC level > 1.5V
OK
Check L150, R183, C158
(and C159, R161 for
Shortcircuit)
OK
Check R176, C179, R177,
R178, R180, C176, C177
and C178.
Not OK
Not OK
Vibra doesn't work
and there isn't any
mechanical problem
BOOMER FAILURE
UPP FAILURE
Check vibra
Replace Buzzer
Ok
UEM FAILURE (D200)
Check L307, C307, C308
UEM FAILURE (D200)
Ok
Ok
Page 6-18ãNokia Corporation.Original
NPE-4
PAMS Technical Documentation6 - Troubleshooting
Charger failure
Phone is off - battery is completely empty
(~3.1 VDC) and no current is drawn from
charger when connected
Yes
Check:
VCHAR > 2.1 VDC on L100 towards C107
Yes
D200 UEM is
faulty
Phone is on or off - battery has norminal
voltage 3.6 VDC and no current is drawn from
charger when connected
Yes
VCHAR > 2.1 VDC on L100 towards C107
Yes
No
No
F100, L100, V101,
C107
Check:
F100, L100, V101,
C107
Check:
D200, D400
Display information when charger connected:
"Not charging"
Yes
Voltage on R240 towards D200 (UEM)
~0.8 VDC when power is connected. BSI
value must be 39K (BPS-2, BLS-2)
Yes
Voltage (Use Scope) on R220 towards D200
(UEM) ~0.9 VDC at peak. BTEMP value must
be 47K.
Yes
Voltage on R200 towards D200 (UEM) same
as VBAT voltage
Yes
Voltage slowly rises on R200 towards D200
(UEM) when charger is connected
No
No
No
No
Check:
X101,
R202,R240,C240
Check:
X102,R202,R220,
C220
Check:
R200, D200
Check:
D200, PWB
Yes
Check:
PWB
OriginalãNokia Corporation.Page 6-19
NPE-4
6 - TroubleshootingPAMS Technical Documentation
Blue Tooth module faults
Flashing fails
V130 P52, P53, P54
VBAT = 3,6V
Yes
V130 P6, L133 P2
VREG = 2,7 - 2,86V
Yes
V130 P32, P49, P18
VAPPL = 1,7 - 3,3V
Yes
V130 P50
SYSCLK 0,5 - 0,8Vampl
26MHz (10ppm)
Yes
V130 P26
SLEEPCLK = 1,8V
32,768kHz (5%)
No
No
No
No
No
None easy
accessable
Failure in VBAT line
check X101 and X102
Faulty PWB or UEM
Faulty PWB or UEM
Faulty PWB or N600
Faulty PWB or UEM
Yes
V130 P34
CBUS_Enx = 0V
When bus is active
Yes
V130 P36
CBUS_CLK = 1,8V
1MHz
Yes
V130 P35
CBUS_Da = 1,8v
Data
Yes
V130 P37
LPRFint = 1,8v
Pulses of approx. 20ms
When BT is on in UI
Yes
No
No
No
No
Faulty PWB or UEM
Faulty PWB or UEM
Faulty PWB or UEM
Faulty PWB or UEM
Replace module
Page 6-20ãNokia Corporation.Original
NPE-4
N
N
N
t
NoN
N
N
N
PAMS Technical Documentation6 - Troubleshooting
o BT air connection
Antenna open circui
Yes
Faulty PWB
o BT audio connection
J143
USARTTx = 1,8V
Data
Yes
J144
USARTRx = 1,8V
Data
Yes
o
o
o
V130 bad soldering
V130 bad soldering
V130 bad soldering
o
o
Replace module
V130
Replace module
V130
Replace module
V130
Faulty PWB
OriginalãNokia Corporation.Page 6-21
NPE-4
N
N
K
N
N
6 - TroubleshootingPAMS Technical Documentation
RF Fail
The problem is most likely RF related
if the following conditions are
fulfilled.
Module can be flashed and BER
·
Test can be initiated.
BER is above limit or no
·
connection to BT-Box
Visual soldering inspectionRe-solder
O
Measure SYSCLK > 200 mVpp
Reference: 11pF probe.
ote: The measured result can depend
very much on the probe type.
Tip: If nessesary, measure a known
good prototype with the same probe.
YES
Measure Vreg » 2.8 volts
YES
Replace MCM
Re-flash BT only
ot OK
O
O
VCTCXO or Buffer failure
See RF troubleshooting document
Check VFLASH1 & L133
Test points can be seen in the document “Baseband testpoints”.
Page 6-22ãNokia Corporation.Original
NPE-4
PAMS Technical Documentation6 - Troubleshooting
RF Troubleshooting
Introduction
Measurements should be done using Spectrum Analyzer with high-frequency highimpedance 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 ASICS Hagar (N600). For easier troubleshooting, this
RF troubleshooting document is divided into sections.
Before changing Hagar, please check the following things: Supply voltages are OK and
serial communication are coming to Hagar (See Baseband troubleshooting document).
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 during repair (ground straps and ESD soldering irons).
The Hagar IC is moisture sensitive so parts must be pre-baked prior to soldering.
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 if
soldering of the component is done properly, for factory repairs (checking if it is missing
from PCB). 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 varies due to different measuring equipment or different
grounding of the used probe.
All tuning must be done with Phoenix Service Software, version 02.90.001, or later.
OriginalãNokia Corporation.Page 6-23
NPE-4
6 - TroubleshootingPAMS Technical Documentation
RF Key component placement
Reference
number
N600HAGAR RF ICX802RF Connector
N840PAL836Directional Coupler
Z610PCN RX SAW filterV830Detector Diode
Z620EGSM RX SAW filterX101Battery Terminal V+
Z650EGSM TX SAW filterX102Battery Terminal V-
Z804RX DUAL SAW filterG630VCO
Z802RXTX Switch ModuleG740VCTCXO
T660PCN TX BalunT630VCO Balun
V810PCN RX LNAC840Supply Capacitor
V820EGSM RX LNAV130Bluetooth Module
X800Antenna signal clipA002HAGAR RF Can
X801Antenna ground clipA003PA Can
Name
Reference
number
Name
Page 6-24ãNokia Corporation.Original
PAMS Technical Documentation6 - Troubleshooting
RF Measurement points
PA Can
Measurement points are shown on the picture below inside the circles.
RF
Connector
VBD
PA EGSM out
PA
PCN out
DUAL SAW
PCN in
DUAL SAW
EGSM PCN in
VANT1 VANT2LNAB_900
NPE-4
V820 RF out
LNAC_900
V820 RF in
DUAL SAW
EGSM out
DUAL SAW
PCN out
VTXB_900
TX_900
V810 RF in
V810 RF out
LNAB_ 1800
TX_1800VTXB_1800
OriginalãNokia Corporation.Page 6-25
NPE-4
6 - TroubleshootingPAMS Technical Documentation
Hagar RF can
Measurement points are shown circled on the picture below.
TXP
TXC
TX_900
TX_1800
VR2
Z610 input
Z620 input
VR4
LNAC_1800
RXIINP
RXQINP
TXQOUT
P/N
VREFRF01
TXIOU
P/N
Bluetooth
Clockbuffer
output
VCO out
VCTCXO supplyVCTCXO outVR3VCO supply
Page 6-26ãNokia Corporation.Original
NPE-4
PAMS Technical Documentation6 - Troubleshooting
Abbreviations in fault finding charts
BBBaseband
DCDirect Current
EGSM Extended GSM (See section 9.6.1 for frequency range)
ESDElectro Static Dicharge
f:Frequency of signal (measured with Spectrum Analyzer)
GPRSGeneral Packed Radio Service
HSCSDHigh Speed Circuit Switched Data
LOLocal Oscillator
P:Power of signal in decibels (dB) (measured with Spectrum Analyzer)
PAPower Amplifier
PCBPrinted Circuit Board
PCNGSM1800 (See section 9.6.2 for frequency range)
PLLPhase Locked Loop
RFRadio Frequency
RXReceiver
T:Time between pulses
TXTransmitter
UHF Ultra High Frequency
V:Voltage of signal (measured with oscilloscope)
VCOVoltage controlled oscillator
VHFVery High Frequency
OriginalãNokia Corporation.Page 6-27
NPE-4
6 - TroubleshootingPAMS Technical Documentation
RF in general
The RF part of this product is a Dualband Direct Conversion transceiver (Also used in
6210, 8210, 8850, 8310, and other). In Direct Conversion no intermediate frequencies are
used for up- or downconversion. The VCO is set to either twice or four times (depending
on the band used) the wanted RX or TX Frequency. The VCO frequency is divided by either
2 or 4 and fed to the mixers (down-conversion) or modulators (up-conversion). Up- or
down-conversion is done in one step, directly between RF frequency and DC. All up and
down-conversion takes place in the RF IC named Hagar (N600). Hagar also contains PLL
and a DC control section used to power and/or control LNAs, TX buffers, Detector and RX/
TX Switch. Hagar is controlled via a serial bus (CTRL).
The RF supports HSCSD (High Speed Circuit Switched Data) and GPRS (General Packed
Radio Service), meaning multislot operation, this will not require special equipment or
procedures in repair situations.
Page 6-28ãNokia Corporation.Original
NPE-4
PAMS Technical Documentation6 - Troubleshooting
EGSM Receiver
General instructions for EGSM RX troubleshooting
Connect the the phone to a PC with DAU-9P cable and dongle and follow the following
instructions:
Start Phoenix Service Software
SelectFileAlt-F
Scan ProductCtrl-R
Wait until phone information shows in the lower right corner of the screen.
Set operating mode to local mode
SelectMaintenanceAlt-M
TuningT
RF ControlsF
Wait until the RF Controls window pops up
SelectBandGSM 900
Active unitRX
Operation modeContinuous
RX/TX Channel37
AGC8
The setup should now look like this:
OriginalãNokia Corporation.Page 6-29
NPE-4
6 - TroubleshootingPAMS Technical Documentation
Apply a 942.467 MHz (channel 37 + 67.710kHz offset) -80 dBm signal to the RF-connector (remember to compensate for cable attenuation).
Measuring with an oscilloscope on “RXIINP” or “RXQINP” this picture should be seen on a
working EGSM receiver:
Signal amplitude 950mV
DC offset1,1V
Frequency67kHz
If this picture is not seen, then go to troubleshooting.
Page 6-30ãNokia Corporation.Original
NPE-4
PAMS Technical Documentation6 - Troubleshooting
Fault finding chart for EGSM receiver
Apply -80dBm
942.467MHz signal from
generator to antenna
connector
Yes
Oscilloscope at RXIINP
Signal 950mVpp
DC offset 1,1V
Frequency 67,7kHz
Yes
EGSM chain functional
Change generator
NoNo
level to -55dBm
EGSM Signal path
EGSM RX Fault finding Tree
Spectrumanalyzer
Yes
Spectrumanalyzer
Check Hagar serial
V820, RFout
-73dBm
Yes
Z620 input
-75dBm
Yes
Oscilloscope
VR4 2.7V
interface
Yes
Check Hagar
N600
Spectrumanalyzer
DUAL SAW
(Z804) EGSM out
-85dBm
Oscilloscope
LNAC_900
2.4-2.8V
LNAB_900 0V
Yes
Oscilloscope
V820, RFout 2.1-2.2V
V820, RFin 0.8-0.9V
Yes
Check
No
Yes
V820
Check
C824
Spectrumanalyzer
No
No
Check
R822,R823,R828,
No
V820,C821,C822,
C828, L822
Check BBNo
Oscilloscope
VR4 2.7V
Check Hagar serial interface
Yes
Check Hagar
N600
Check BaseBandNo
DUAL SAW
(Z804) EGSM in
-84dBm
Yes
Check Z804
No
Check RX/TX
Switch
Z802
For easy error tracing it is important to know the signal path of the EGSM receiver. The
compnents can be grouped into blocks and drawn as shown below. Note that the picture
shows bothe EGSM receiver (bottom) and PCN (top).
RX/TX Switch
From the antenna-pad (X800) the RF signal is lead to the RX/TX switch (Z802) via a
mechanical switch, the antenna connector (X802).
Tba
OriginalãNokia Corporation.Page 6-31
NPE-4
6 - TroubleshootingPAMS Technical Documentation
If no control voltage is present at VC1 or VC2 the RX/TX switch is open to the two RX
outlets GSM_Rx and DCS_Rx. The RX/TX switch will work as a diplexer and EGSM signals
pass to GSM_Rx and PCN signals to DCS_Rx.
From GSM_Rx the EGSM signal is feed to the Dual RX SAW filter (Z804) via C804.
Front-end
The EGSM front-end consists mainly of two SAW filters (Z804 and Z620) and one LNA
(V820) in-between. The SAW filters provides out-of-band blocking immunity, the LNA
provides front-end gain. The first SAW filter (Z804) is a DUAL package including SAW filter for both EGSM and PCN. The last SAW filter (Z620) is single ended input and balanced output providing a balanced signal input for Hagar (N600).
The signal-path is through Z804 (In-band insertion-loss 3,5dB), through the matching
circuit (L821, L820 and C821) and to the EGSM LNA (V820, RFin).
nd
From the LNA (V820, RF out) the signal is lead through C824, through the 2
SAW Z620 (In-band insertion-loss 3,5dB), through the balanced matching circuit (C626,
C627, L626) to Hagar (N600).
EGSM
Hagar
The balanced RX signal is mixed with a signal from the local oscillator at the same frequency as the wanted RX signal. After mixing the signal is converted to a single ended
signal in the DtoS (Differential to Single ended) amplifier. The signal is now filtered in a
BIQUAD filter to provide channel separation, amplified in the BB_Gain amplifier and DC
compensated in DCN2.
PCN Receiver
General instructions for PCN RX troubleshooting
Connect the the phone to a PC with DAU-9P cable and dongle and follow the following
instructions:
Start Phoenix Service Software
SelectFileAlt-F
Scan ProductCtrl-R
Wait until phone information shows in the lower right corner of the screen.
Set operating mode to local mode
SelectMaintenanceAlt-M
TuningT
RF ControlsF
Page 6-32ãNokia Corporation.Original
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PAMS Technical Documentation6 - Troubleshooting
Wait until the RF Controls window pops up
SelectBandGSM 1800
Active unitRX
Operation modeContinuous
RX/TX Channel700
AGC8
The setup should now look like this:
Apply a 1842.867 MHz (channel 700 + 67.710kHz offset) -80 dBm signal to the RF-connector (remember to compensate for cable attenuation).
OriginalãNokia Corporation.Page 6-33
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Measuring with an oscilloscope on “Hagar RXI” or “Hagar RXQ” this picture should be
seen on a working PCN receiver:
Signal amplitude 1.5V
DC offset1,1V
Frequency67kHz
If this picture is not seen, then go to section 6.2 of this document for troubleshooting.
Fault finding chart for PCN receiver
Apply -80dBm
1842.867MHz signal
from generator to
antenna connector
Yes
Oscilloscope at RXIINP
Signal 1.5Vpp
DC offset 1.1V
Frequency 67.7kHz
Yes
PCN chain functional
Change generator
NoNo
level to -55dBm
PCN RX Fault finding Tree
Spectrumanalyzer
Yes
Spectrumanalyzer
Check Hagar serial
V810, RFout
-72dBm
Yes
Z610 input
-75dBm
Yes
Oscilloscope
VR4 2.7V
interface
Yes
Spectrumanalyzer
(Z804) PCN out
LNAB_1800 0V
Oscilloscope
V810, RFout 2.1-2.2V
V810, RFin 0.8-0.9V
No
DUAL SAW
-92dBm
Yes
Oscilloscope
LNAC_1800
2.4-2.8V
Yes
Yes
Check
V810
Check
C814
Spectrumanalyzer
No
No
Check
R812,R813,R818,
No
V810,C811,C812,
C818, L812
Check BBNo
Oscilloscope
VR4 2.7V
Check Hagar serial int erface
Yes
Check Hagar
N600
Check BaseBandNo
DUAL SAW
(Z804) PCN in
-91dBm
Yes
Check Z804
No
Check RX/TX
Switch
Z802
Check Hagar
N600
Page 6-34ãNokia Corporation.Original
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PCN Signal path
For easy error tracing it is important to know the signal path of the PCN receiver. The
components can be grouped into blocks and drawn as shown below. Note that the picture shows both EGSM recieiver (bottom) and PCN receiver (top).
Tba
RX/TX Switch
From the antenna-pad (X800) the RF signal is lead to the RX/TX switch (Z802) via a
mechanical switch, the antenna connector (X802).
If no control voltage is present at VC1 or VC2 the RX/TX switch is open to the two RX
outlets GSM_Rx and DCS_Rx. The RX/TX switch will work as a diplexer and EGSM signals
pass to GSM_Rx and PCN signals to DCS_Rx.
From DCS_Rx the PCN signal is feed to the Dual RX SAW filter (Z804) via C806.
Front-end
The PCN front-end consists mainly of two SAW filters (Z804 and Z610) and one LNA
(V810) in-between. The SAW filters provides out-of-band blocking immunity, the LNA
provides front-end gain. The first SAW filter (Z804) is a DUAL package including SAW filter for both EGSM and PCN. The last SAW filter (Z610) is single ended input and balanced
output providing a balanced signal input for Hagar (N600).
The signal-path is through Z804 (In-band insertion-loss max 4dB), through C811 to the
PCN LNA (V810, RFin).
From the LNA (V810, RF out) the signal is lead through C814, through the 2nd EGSM SAW
Z610 (In-band insertion-loss max 4dB), through the balanced matching circuit (C616,
C617, L616) to Hagar (N600).
OriginalãNokia Corporation.Page 6-35
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Hagar
The balanced RX signal is mixed with a signal from the local oscillator at the same frequency as the wanted RX signal. After mixing the signal is converted to a single ended
signal in the DtoS (Differential to Single ended) amplifier. The signal is now filtered in a
BIQUAD filter to provide channel separation, amplified in the BB_Gain amplifier and DC
compensated in DCN2.
EGSM Transmitter
General instructions for EGSM TX troubleshooting
Apply a RF-cable to the RF-connector to allow the transmitted signal to act as normal.
RF-cable should be connected to measurement equipment (GSM Test equipment, Powermeter, Spectrum Analyzer, or similar) or to at least a 10-dB attenuator, otherwise the PA
may be damaged.
Connect the the phone to a PC with DAU-9P cable and dongle and follow the following
instructions:
Start Phoenix Service Software
SelectFileAlt-F
Scan ProductCtrl-R
Wait until phone information shows in the lower right corner of the screen.
Set operating mode to local mode
SelectMaintenanceAlt-M
TuningT
RF ControlsF
Wait until the RF Controls window pops up
SelectBandGSM 900
Active unitTX
Operation modeBurst
RX/TX Channel37
TX PA ModeFree
TX Power Level10
TX Data TypeRandom
Page 6-36ãNokia Corporation.Original
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The setup should now look like this:
Now the measurement equipment should measure the following output signal from the
phone.
·P
+23dBm @ 897.4MHz
out
If this is not the case, then go to the fault finding chart for EGSM transmitter in this document for troubleshooting.
OriginalãNokia Corporation.Page 6-37
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Path of the transmitted EGSM signal
For easy error tracing it is important to know the signal path of the EGSM transmitter.
The components can be grouped into blocks and drawn as shown below. Note that the
picture shows both EGSM transmitter (bottom) and PCN transmitter (top).
HAGAR
V_ANT_1/
V_ANT_2
2
VBD
VTXLO_G
VTX_B_G
VTX_B_P
RF
Controls
Antenna connector
Hagar
PA
Dir. Coupler
RX
PCN
TX
RX
Ant Switch
GSM
TX
PA
DET
VBATTRF
BALUN
SAW
OUTP_P_TX/
OUTM_P_TX
2
OUTP_G_TX/
OUTM_G_TX
2
DET
Open collector
Open collector
Vpctrl_g
TXI_0/TXI_180
2
TXQ_0/TXQ_180
2
PWC
Vpctrl_p
TXP
TXC
TXIOUTP/TXIOUTN
2
TXQOUTP/TXQOUTN
2
VBATTRF
The Balanced TX signal from baseband is coming to the RF IC Hagar. It includes RF modulators, one for EGSM and one for PCN. The Baseband signal is mixed with the LO signal
corresponding to the wanted TX channel. The PCN TX output of Hagar is a balanced signal.
From the output of Hagar the signal goes through the EGSM TX SAW filter (Balanced to
single ended) to the PA EGSM input.
TXC
TXP
VR2
The PA EGSM part has a maximum output at app. 35dBm. The supply is coming directly
from the Battery terminals.
The output is controlled by Hagar by the power control loop. From the ouput of the PA
the signal goes through the directional coupler (one of the power control loop components) to the RXTX Switch.
RXTX Switch
The RXTX Switch is making the filtering between RX and TX Bands and between EGSM
and PCN bands. It is controlled by Hagar by the two voltages VANT1 and VANT2. The following table shows the different states.
Apply a RF-cable to the RF-connector to allow the transmitted signal to act as normal.
RF-cable should be connected to measurement equipment (GSM Test equipment, Powermeter, Spectrum Analyzer, or similar) or to at least a 10-dB attenuator, otherwise the PA
may be damaged.
Connect the the phone to a PC with DAU-9P cable and dongle and follow the following
instructions:
Start Phoenix Service Software
SelectFileAlt-F
Scan ProductCtrl-R
Wait until phone information shows in the lower right corner of the screen.
Set operating mode to local mode
SelectMaintenanceAlt-M
TuningT
RF ControlsF
Wait until the RF Controls window pops up
SelectBandGSM 1800
Active unitTX
Operation modeBurst
RX/TX Channel700
TX PA ModeFree
TX Power Level5
TX Data TypeRandom
Page 6-40ãNokia Corporation.Original
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PAMS Technical Documentation6 - Troubleshooting
The setup should now look like this:
Now the measurement equipment should measure the following output signal from the
phone.
·P
+20dBm @ 1747.8MHz
out
If this is not the case, then go to the fault finding chart for PCN transmitter in this document for troubleshooting.
Path of the transmitted PCN signal
For easy error tracing it is important to know the signal path of the PCN transmitter. The
components can be grouped into blocks and drawn as shown below. Note that the picture shows both EGSM transmitter (bottom) and PCN transmitter (top)
OriginalãNokia Corporation.Page 6-41
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HAGAR
V_ANT_1/
V_ANT_2
2
VBD
VTXLO_G
VTX_B_G
VTX_B_P
RF
Controls
Antenna connector
Hagar
Dir. Coupler
RX
PCN
TX
RX
Ant Switch
GSM
TX
PA
DET
VBATTRF
BALUN
SAW
OUTP_P_TX/
OUTM_P_TX
2
OUTP_G_TX/
OUTM_G_TX
2
DET
Open collector
Open collector
Vpctrl_g
TXI_0/TXI_180
2
TXQ_0/TXQ_180
2
PWC
Vpctrl_p
TXP
TXC
TXIOUTP/TXIOUTN
2
TXQOUTP/TXQOUTN
2
VBATTRF
The Balanced TX signal from baseband is coming to the RF IC Hagar. It includes RF modulators, one for EGSM and one for PCN. The Baseband signal is mixed with the LO signal
corresponding to the wanted TX channel. The output of Hagar is a balanced signal.
From the PCN TX output of Hagar the signal goes through the PCN TX Balun (Balanced to
single ended) to the PA PCN TX input.
TXC
TXP
VR2
PA
The PA PCN part has a maximum output at app. 32dBm. The supply is coming directly
from the Battery terminals.
The output is controlled by Hagar by the power control loop. From the ouput of the PA
the signal goes through the directional coupler (one of the power control loop components) to the RXTX Switch.
RXTX Switch
The RXTX Switch is making the filtering between RX and TX Bands and between EGSM
and PCN bands. It is controlled by Hagar by the two voltages VANT1 and VANT2. The following table shows the different states.
There is only one PLL synthesiser generating frequencies for both Rx and Tx in both bands
OriginalãNokia Corporation.Page 6-43
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(EGSM and PCN). VCO frequency is divided by 2 or by 4 in HAGAR depending on which
band is active.
General instructions for Synthesiser troubleshooting
Connect the the phone to a PC with DAU-9P cable and dongle and follow the following
instructions:
Start Phoenix Service Software
SelectFileAlt-F
Scan ProductCtrl-R
Wait until phone information shows in the lower right corner of the screen.
Set operating mode to local mode
SelectMaintenanceAlt-M
TuningT
RF ControlsF
Wait until the RF Controls window pops up
SelectBandGSM 900
Active unitRX
Operation modeContinuous
RX/TX Channel37
Page 6-44ãNokia Corporation.Original
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The setup should now look like this:
Now it is possible to measure frequency of 3769.6MHz at the output of the VCO (G630)
using a resistive probe and a spectrum analyzer.
If this is not the case, then go to fault finding chart for PLL synthesiser in this document
for troubleshooting.
26 MHz reference oscillator ( VCTCXO )
The 26 MHz oscillator (G740) has three functions.
=Reference frequency for the PLL synthesiser.
=System clock for BB (13 MHz) after it is divided by 2 in HAGAR.
=26 MHz Reference clock for Bluetooth Module (V130).
26 MHz signal from the VCTCXO is approx. 0,8 Vpp. Frequency of this oscillator is
adjusted by dc voltage (Vcon) coming from the DAC in UEM (D200). Range of Vcon is 0.3
– 2.3 V.
OriginalãNokia Corporation.Page 6-45
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VCO
The VCO is able to generate frequencies in the range of 3420 – 3840 MHz when PLL is in
function. The frequency of the VCO signal is divided by 2 or by 4 in HAGAR so it is possible to generate the frequency of all channels in EGSM and PCN (both RX and TX). Frequency of the VCO is controlled by DC voltage (Vc) coming from the loop filter. Range of
the Vc when PLL is in function is 0.7 – 3.8 V. Even if PLL is not working (Vc out of range)
there is some frequency at the output of the VCO which is between 3 and 4 GHz (if the
VCO itself is ok).
Fault finding chart for PLL Synthesiser
Setup with Phoenix:
Band: GSM 900
Mode: RX Continuous
Channel: 37
Yes
Spectrumanalyzer
VCO out (G630 out)
3769.6 MHz
Yes
Oscilloscope
Bluetooth Clockbuffer
output (LPRFCLK_I)
(C753)
26MHz
Yes
PLL Block is functional
Oscilloscope
No
No
VCTCXO Supply
(G740 Vcc)
Check UEM,
Software??
Phone not in function
Check Bluetooth
Clockbuffer
R750,R751,R752,
V831,C752,C753
2.7V
No
PLL Synthesiser Fault finding Tree
Oscilloscope
Yes
VCTCXO output
(G740 out)
26MHz,app.0.8Vpp
VCTCXO is dead
Check HAGAR,
Wrong writing to HAGAR
Yes
No
Yes
Oscilloscope
VCO Supply
(G630 Vcc)
Check UEM,
Software??
Phone not in function
Spectrumanalyzer
VCO out (G630 out)
Some signal 3-4 GHz
VCTCXO is dead
2.7V
No
Yes
No
It is important to say that power supply for VCTCXO ( VXO) is OFF only in ‘Deep Sleep
Mode’ and power supply for VCO (G630 Vcc) is OFF in ‘Sleep Mode’.
Since the PA is a LGA package removal and attachment must be done in a way specified
below.
Removal instuctions
•ESD Protection Follow RFMD’s ESD Work Instructions when handling microcircuit
devices.
•Before removal, the modules to be removed MUST BE BAKED in a calibrated oven/
chamber for 24 hours at 125ºC to remove moisture from the package.
•Set up the PC board to be repaired so that it is directly over the blower section of
the Hako 853 heater. The PC board should be 0.5 inches above the Hako 853.
•Set the Hako 853 heater to 250ºC and the Thermo Flow BGA/SMD blower temperature to 250ºC. The Thermo Flow blower speed should be set to 8. The actual remove
profile is shown at the figure below.
•Turn the Hako 853 ON and preheat the PC board for 1.5 minutes.
•After the 1.5 minutes, set the Hako 853temperature to 200ºC and continue preheating for another 2.5 minutes.
•Set the Hako 853 temperature back to 250ºC.
•Turn on the blower for the Thermo Flow BGA/SMD blower. Verify that the temperature setting is 250ºC with a blower speed of 8 and then heat the top of the module.
Hold the blower nozzle approximately 0.25 inches from the top of module.
•Module should be removable with in 1 minute. Use tweezers to carefully remove the
module from the PC board.
•Turn OFF the Hako 853 heater and the Thermo flow blower.
•Wait 5 minutes before handling the PC board as it should be close to room temperature at this time.
Remove Profile
250
200
150
Tem perature
Temperature (C)
100
50
0
0
1
2
3
Time
4
5
6
Page 6-50ãNokia Corporation.Original
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PAMS Technical Documentation6 - Troubleshooting
Attachment instructions
•ESD Protection Follow RFMD’s ESD Work Instructions when handling microcircuit
devices.
•Before attachment can begin, the modules to be attached MUST BE BAKED in a calibrated oven/chamber for 24 hours at 125ºC to remove moisture from the package.
•Set up the PC board to be attached so that it is directly over the blower section of
the Hako 853 heater. The PC board should be 0.5 inches above the Hako 853.
•Set the Hako 853 heater to 250ºC and the Thermo Flow BGA/SMD blower temperature to 250ºC. The Thermo Flow blower speed should be set to 8. The actual attachment reflow profile is shown at the figure below.
•Turn the Hako 853 ON and preheat the PC board for 2.0 minutes.
•After the 2.0 minutes, set the Hako 853 temperature to 200ºC and continue preheating for another 1.0 minute.
•Using ESD protection and tweezers, carefully place the module to be attached, on
the board. Verify the proper alignment and pin 1 orientation.
•Turn on the blower for the Thermo Flow BGA/SMD blower. Verify that the temperature setting is 250ºC with a blower speed of 8 and then heat the top of the module.
Hold the blower nozzle approximately 0.25 inches from the top of module.
•Module should be solder with in 1 minute.
•Turn OFF the Hako 853 heater and the Thermo flow blower.
•Wait 5 minutes before handling the PC board as it should be close to room temperature at this time.
Atta chment Reflow Profile
250
200
150
100
50
Temperature
0
1
0
3
2
Time
4
6
5
Temper ature
OriginalãNokia Corporation.Page 6-51
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Phoenix tuning
Before any tuning the phone should syncronised with the PC.
Connect the the phone to a PC with DAU-9P cable and dongle and follow the following
instructions:
Start Phoenix Service Software
SelectFileAlt-F
Scan ProductCtrl-R
Wait until phone information shows in the lower right corner of the screen.
RF tuning after repairs
Different repairs require different tuning. In general it is necessary to determine in which
section the repair was done to select which tunings to perform. To determine if RF tuning
is necessary after repair it is important that the functionality of the repaired circuit is
understood well.
•In general repairs in the TX part will require "TX Power Level Tuning" and "TX IQ
Tuning".
•In general repairs in the RX part or PLL part always require "RX Calibration" and
in some cases require "RX AM Suppression" tuning, "RX Channel Select Filter Calibration" and/or "RX Band Filter Response Compensation" tuning.
Other parts interfacing to TX, RX or PLL might require tuning, but common sense should
be used, e.g. if a component that has no influence on RF performance has been changed,
e.g. the microphone, on/off key, mechanichal parts or similar, there is no need to do any
RF tuning.
RX Calibration
The "RX calibration" is used to determine gain at different gain-settings for front-end
and Hagar and needs to be done in both bands.
EGSM
Set operating mode to local mode
SelectMaintenanceAlt-M
TuningT
RX CalibrationC
Wait until the RX Calibration window pops up.
SelectBandGSM 900
Autom.- 80
1st Man.-50
2nd Man.-85
Page 6-52ãNokia Corporation.Original
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PAMS Technical Documentation6 - Troubleshooting
The setup should now look like this:
Select Automatic, press Start and a new window pops up:
Select default, press OK and the window closes.
Now it is possible to press the calibrate button in the RX Calibration window.
OriginalãNokia Corporation.Page 6-53
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6 - TroubleshootingPAMS Technical Documentation
Press Calibrate and a window pops up:
Connect an external signal generator to the RF connector of the phone and set the generator as told in the window.
Press ok and the window closes.
PCN
Press Stop in the RX Calibration window and a new window pops up:
Press Yes and the EGSM RX Calibration is finished.
Set operating mode to local mode
SelectMaintenanceAlt-M
TuningT
RX CalibrationC
Wait until the RX Calibration window pops up
SelectBandGSM 1800
Autom.- 80
1st Man.-50
nd
Man.-85
2
Page 6-54ãNokia Corporation.Original
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PAMS Technical Documentation6 - Troubleshooting
The setup should now look like this:
Select Automatic, press Start and a new window pops up:
Select default, press OK and the window closes.
Now it is possible to press the calibrate button in the RX Calibration window.
OriginalãNokia Corporation.Page 6-55
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6 - TroubleshootingPAMS Technical Documentation
Press Calibrate and a window pops up:
Connect an external signal generator to the RF connector of the phone and set the generator as told in the window.
Press ok and the window closes.
Press Stop in the RX Calibration window and a new window pops up:
Press Yes and the PCN RX Calibration is finished.
RX Band Filter Response Compensation
EGSM
Set operating mode to local mode
Select MaintenanceAlt-M
TuningT
RF ControlsF
Wait until the RF Controls window pops up
Select BandGSM 900
Select MaintenanceAlt-M
TuningT
RX Band Filter Response CompensationB
Page 6-56ãNokia Corporation.Original
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PAMS Technical Documentation6 - Troubleshooting
A window pops up:
Select Yes and the RX Band Filter Response Compensation window pops up.
The setup should now look like this:
SelectInput Signal Level-80
OriginalãNokia Corporation.Page 6-57
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6 - TroubleshootingPAMS Technical Documentation
Press Manual tuning and a window pops up:
Connect an external signal generator to the RF connector of the phone and set the generator as told in the window.
Press OK and a new window pops up:
PCN
Set the generator as told in the window.
Press OK and a new window pops up. Repeat this sequense 9 times until all channels are
done.
Press Stop, Write to PM Area (In the RX Band Filter Response Compensation window) and
a window pops up:
Press Yes and the EGSM RX Band Filter Response Compensation is finished.
Set operating mode to local mode
SelectMaintenanceAlt-M
TuningT
RF ControlsF
Page 6-58ãNokia Corporation.Original
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PAMS Technical Documentation6 - Troubleshooting
Wait until the RF Controls window pops up
SelectBandGSM 1800
SelectMaintenanceAlt-M
TuningT
RX Band Filter Response CompensationB
A window pops up:
Select Yes and the RX Band Filter Response Compensation window pops up.
The setup should now look like this:
SelectInput Signal Level-80
OriginalãNokia Corporation.Page 6-59
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6 - TroubleshootingPAMS Technical Documentation
Press Manual tuning and a window pops up:
Connect an external signal generator to the RF connector of the phone and set the generator as told in the window.
Press OK and a new window pops up:
Set the generator as told in the window.
Press OK and a new window pops up. Repeat this sequense 9 times until all channels are
done.
Press Stop, Write to PM Area (In the RX Band Filter Response Compensation window) and
a window pops up:
Press Yes and the PCN RX Band Filter Response Compensation is finished.
RX Channel Select Filter Calibration
This calibration is calibrating the Baseband filter inside Hagar, for this reason the calibration is not done in both bands.
Set operating mode to local mode
Select MaintenanceAlt-M
TuningT
RX Channel Select filter CalibrationH
Page 6-60ãNokia Corporation.Original
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PAMS Technical Documentation6 - Troubleshooting
A window pops up:
Select Yes and the RX Channel Select Filter Calibration window pops up.
The setup should now look like this:
Press Autotune and the optimal values are found.
Press Stop and a new window pops up:
OriginalãNokia Corporation.Page 6-61
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6 - TroubleshootingPAMS Technical Documentation
Press Yes and the RX Channel Select Filter Calibration is finished.
RX AM Suppression
This calibration is tuning the AM suppression performance of Hagar mixers and will have
to be done in both bands. If flash or Hagar have been replaced or Full Factory settings
have been performed RX AM Suppression must be done.
EGSM
Set operating mode to local mode
Select MaintenanceAlt-M
TuningT
RX AM SuppressionS
Wait until the RX AM Suppression window pops up
SelectBandGSM 900
Press Start and a window pops up:
Page 6-62ãNokia Corporation.Original
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PAMS Technical Documentation6 - Troubleshooting
Select Default, press OK and the setup should now look like this:
PCN
Connect an external signal generator to the RF connector of the phone and set the generator as told in the window.
Select Tuning modeAutomatic
Press Tune and the optimal values are found.
Press Stop and a window pops up:
Press Yes and the EGSM RX AM Suppression tuning is finished.
Set operating mode to local mode
OriginalãNokia Corporation.Page 6-63
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6 - TroubleshootingPAMS Technical Documentation
Select MaintenanceAlt-M
TuningT
RX AM SuppressionS
Wait until the RX AM Suppression window pops up
SelectBandGSM 1800
Press Start and a window pops up:
Select Default, press OK and the setup should now look like this:
Connect an external signal generator to the RF connector of the phone and set the generator as told in the window.
Page 6-64ãNokia Corporation.Original
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PAMS Technical Documentation6 - Troubleshooting
SelectTuning modeAutomatic
Press Tune and the optimal values are found.
Press Stop and a window pops up:
Press Yes and the PCN RX AM Suppression tuning is finished.
TX Power tuning
This tuning must be done in both bands.
Note: TX Power tuning must be done with a peak power meter, e.g. Rohde & Schwarz model
NRVD with a Rohde & Schwarz Peak Power Sensor TDMA Model NRV-Z31 and a suitable
attenuator.
The use of power meter in GSM testers is likely to cause larger error than the use of a
dedicated power meter and might cause the phone to be non-compliant with GSM specifications.
EGSM
Set operating mode to local mode
Select MaintenanceAlt-M
TuningT
TX Power Level TuningL
Wait until the TX Power Level Tuning window pops up.
Connect a calibrated powermeter to the RF connector of the phone.
SelectBandGSM 900
Active UnitTX
OriginalãNokia Corporation.Page 6-65
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6 - TroubleshootingPAMS Technical Documentation
Press Start and a window pops up:
Select Permanent memory, press OK and the window closes.
SelectTX Data TypeRandom
The setup should now look like this:
SelectTX PA ModeHigh
Adjust DAC Values for Power Level 5, 15 and 19 according to Target values.
Press calculate, check if all levels match the target values, correct if necessary.
Select TX PA ModeLow
Page 6-66ãNokia Corporation.Original
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Adjust DAC Values for Power Level 7, 15 and 19 according to Target values.
Press calculate, check if all levels match the target values, correct if necessary.
Press Stop and a window pops up:
Select'Save values to Phone Permanent Memory'
PCN
Press Yes and the EGSM TX Power Level Tuning is finished.
Set operating mode to local mode
Select MaintenanceAlt-M
TuningT
TX Power Level TuningL
Wait until the TX Power Level Tuning window pops up.
Connect a calibrated powermeter to the RF connector of the phone.
SelectBandGSM 1800
Active UnitTX
Press Start and a window pops up:
Select Permanent memory, press OK and the window closes.
SelectTX Data TypeRandom
OriginalãNokia Corporation.Page 6-67
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The setup should now look like this:
SelectTX PA ModeHigh
Adjust DAC Values for Power Level 0, 11 and 15 according to Target values.
Press calculate, check if all levels match the target values, correct if necessary.
Press Stop and a window pops up:
Select'Save values to Phone Permanent Memory'
Press Yes and the EGSM TX Power Level Tuning is finished.
Page 6-68ãNokia Corporation.Original
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TX I/Q Tuning
This tuning must be done in both bands.
EGSM
Set operating mode to local mode
Select MaintenanceAlt-M
TuningT
TX IQ TuningI
Wait until the TX IQ Tuning window pops up.
Connect a Spectrum Analyzer or GSM tester with the option *Narrow Spectrum' to the
RF connector of the phone.
If a spectrum analyzer is used then use the following settings.
EGSM
Center Frequency897.4 MHz
Frequency Span300 kHz
Resolution Bandwidth3kHz
Video Bandwidth3kHz
Sweep Time3 sek.
Sweep TypeClear/Write
Detector TypeMax Peak
Reference level35 dBm
Marker 1897.33229 MHz
Marker 2897.4 MHz
Marker 3897.46771 MHz
Use an appropriate attenuator 10 or 20dB insertion loss and set the Reference Level Offset according to insertion loss from the phone to the Spectrum Analyzer.
SelectBandGSM 900
Operation ModeBurst
RX/TX Channel37
Select'Load from Product'
PressStart
SelectTX Data TypeAll1
OriginalãNokia Corporation.Page 6-69
NPE-4
6 - TroubleshootingPAMS Technical Documentation
TX PA ModeFree
The setup should now look like this:
Page 6-70ãNokia Corporation.Original
NPE-4
PAMS Technical Documentation6 - Troubleshooting
The Spectrum Analyzer now shows a plot like this:
The purpose of this tuning is to tune the carrier signal and the +67kHz signal to a minimum level (Marker 2 and 3).
Use the varables 'TX I DC offset' and 'TX Q DC offset' to adjust the carrier signal to a minimum level (Marker 2).
OriginalãNokia Corporation.Page 6-71
NPE-4
6 - TroubleshootingPAMS Technical Documentation
The Spectrum Analyzer now shows a plot like this:
Use the varables 'Amplitude difference' and 'Phase difference' to adjust the +67kHz signal to a minimum level (Marker 3).
Page 6-72ãNokia Corporation.Original
NPE-4
PAMS Technical Documentation6 - Troubleshooting
The Spectrum Analyzer now shows a plot like this:
Select'Save to Product'
Press Stop and the values are stored in the phone.
The EGSM TX IQ Tuning is now finished.
Note:
PCN
OriginalãNokia Corporation.Page 6-73
The optimal values for "TX I and Q Offset" and "Amplitude and Phase Difference" vary
from phone to phone.
Set operating mode to local mode
SelectMaintenanceAlt-M
TuningT
TX IQ TuningI
NPE-4
6 - TroubleshootingPAMS Technical Documentation
Wait until the TX IQ Tuning window pops up.
Connect a Spectrum Analyzer or GSM tester with the option *Narrow Spectrum' to the
RF connector of the phone.
If a spectrum analyzer is used then use the following settings.
PCN
Center Frequency1747.8MHz
Frequency Span300 kHz
Resolution Bandwidth3 kHz
Video Bandwidth3 kHz
Sweep Time3 sek.
Sweep TypeClear/Write
Detector TypeMax Peak
Reference level35 dBm
Marker 11747.73229 MHz
Marker 21747.8 MHz
Marker 31747.86771 MHz
Use an appropriate attenuator 10 or 20dB insertion loss and set the Reference Level Offset according to insertion loss from the phone to the Spectrum Analyzer.
SelectBandGSM 1800
Operation ModeBurst
RX/TX Channel700
Select'Load from Product'
PressStart
SelectTX Data TypeAll1
TX PA ModeFree
Page 6-74ãNokia Corporation.Original
NPE-4
PAMS Technical Documentation6 - Troubleshooting
The setup should now look like this:
OriginalãNokia Corporation.Page 6-75
NPE-4
6 - TroubleshootingPAMS Technical Documentation
The Spectrum Analyzer now shows a plot like this:
The purpose of this tuning is to tune the carrier signal and the +67kHz signal to a minimum level (Marker 2 and 3).
Use the varables 'TX I DC offset' and 'TX Q DC offset' to adjust the carrier signal to a minimum level (Marker 2).
Page 6-76ãNokia Corporation.Original
NPE-4
PAMS Technical Documentation6 - Troubleshooting
The Spectrum Analyzer now shows a plot like this:
Use the varables 'Amplitude difference' and 'Phase difference' to adjust the +67kHz signal to a minimum level (Marker 3).
OriginalãNokia Corporation.Page 6-77
NPE-4
6 - TroubleshootingPAMS Technical Documentation
The Spectrum Analyzer now shows a plot like this:
Select'Save to Product'
Press Stop and the values are stored in the phone.
The PCN TX IQ Tuning is now finished.
Note:
Page 6-78ãNokia Corporation.Original
The optimal values for "TX I and Q Offset" and "Amplitude and Phase Difference" vary
from phone to phone.
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