PAMS Technical Documentation

NPM–9 Series Transceivers

Troubleshooting
Instructions

Issue 1 02/2002
Nokia Corporation

NPM–9
Troubleshooting Instructions PAMS Technical Documentation

CONTENTS
Transceiver Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Baseband Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
PWB Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Measurement Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Troubleshooting steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Main troubleshooting tree . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Phone is dead . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Flash programming doesn’t work . . . . . . . . . . . . . . . . . . . . . 8
Phone is jammed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Charging fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
SIM card is out of order (insert SIM card) . . . . . . . . . . . . . . 13
Audio fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Display fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Keypad fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
RF Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
RF Key Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
PWB Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Transmitter troubleshooting diagram . . . . . . . . . . . . . . . . . . 28
Transmitter signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Receiver troubleshooting diagram for GSM900 . . . . . . . . . 34
Receiver troubleshooting diagram for GSM1800 . . . . . . . . 35
LNA gainstep checking GSM900 & GSM1800 . . . . . . . . . . 36
Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Synthesizer troubleshooting diagram . . . . . . . . . . . . . . . . . 38
Synthesizer signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
FM Radio troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
FM Radio troubleshooting diagram . . . . . . . . . . . . . . . . . . . 42
FM Radio signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

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Transceiver Troubleshooting

Baseband Troubleshooting

PWB Test Points

MBUSTX MBUSRX SLEEPCLK

FBUSRX FBUSTX CBUSDA

DBUSCLK
DBUSDA
UEMINT
PURX CBUSCLK

MBUS VPP DBUSENX1

GND
CBUSENX

SLEEPX
FMCLK FBUSTX
FMTUNEX
EXTRDX
FMCTRLDA FBUSRX
FMCTRLCLK
FMWREN
FPS–8
FM RADIO

BLACK colored test points are connected to the lines between UEM and
UPP where the logic level is 1.8 V.
RED colored test points are connected to the lines from FPS–8 and have
2.7 V logic level.
BLUE test points are connected to FM radio lines and have 1.8 V logic
level.

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Measurement Points

VR5 2.78 V VR7 2.78 V VR3 2.78 V

VOUT
VFLASH2 2.78 V
VDD 2.78 V
VR1B 4.75 V
VDDI 1.8 V
VR1A 4.75 V
SCLK VR2 2.78 V
SDA
VR6 2.78 V
GND
VR4 2.78 V

XCS

XRES

VIO 1.8V VCORE 1.8V VANA 2.78 V VFLASH1 2.78 V

Troubleshooting steps
The following hints help to find the problem if the circuitry seems to be
faulty. The instructions are divided into following sections:
1. Phone is totally dead
2. Flash programming doesn’t work
3. Power doesn‘t stay on or the phone is jammed
4. Charging fault
5. Plug in SIM card is out of order (insert SIM card).
6. Audio fault
7. Display is not working
8. Keypad fault
The first thing to do is carry out a through visual check of the module. En-
sure in particular that:
a) there are not any mechanical damages
b) soldered joints are OK

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Main troubleshooting tree

TOP

Phone totally Yes Phone is

dead dead

No

Flash programming Yes Flash

doesn’t work faults

No

Phone doesn’t Yes Phone is

start up or the phone is
jammed
jammed

No

Charging Yes
Charger
doesn’t work

No

TOP 2

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TOP 2

Phone doesn’t read Yes

SIM card
SIM card

No

Yes Audio
Audio faults
faults

No

Display or LED’s Yes Display

doesn’t work faults

No

Keypad Yes Keypad

doesn’t work faults

No
END

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Phone is dead

Phone is
dead

Yes Check X101

Phone current
solder and
is zero ?
VBATT lines

No

Yes Is phone Yes Phone is

Phone current is < 50mA flash programing OK ? jammed

No No

Flash
faults
No
Phone current is ~ 54 mA

Yes

No Check BSI line Yes

Is phone in LOCAL Change UEM
X101, C241, R203, C109,
MODE ?
R202
Are they OK ?

Yes No
Repair
OK retest

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Flash programming doesn’t work

Flash
faults

Check BSI line

The Phone does Yes Measure BSI pulse No X101, C241,
not set Flashbus TXD line during Flash R203, C109,
high after the startup. programming. R202
Is it OK ?

No Yes

Measure FBUSTX
line during Flash No Check R102
programming If OK –>
from testpoint J411 Change UEM
Is it High (1.8V) ?

Yes
Change UPP

The Phone does not set Yes

Flashbus TXD line low after Change UPP
the line has been high.

No

Flash faults
page 2

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Flash faults
page 2

Yes Change
Wrong manufactor ID FLASH
and Device ID

No

Yes Phone is
Is the phone totally dead ? dead

No

Phone
doesn’t start up Yes Phone is
or the phone jammed
is jammed ?

No

Retest

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Phone is jammed

Phone is
jammed
Check
Check VBATT1–6 Z260 – Z265
VIO, VCORE, No C260 – C265
FLASH1, VANA, BSI / BTEMP
Measure VR3 lines. Are lines and
VIO, VCORE, FLASH1, No they OK? VBATT lines
VANA, VR3 voltages.
Are they OK ? Check BSI /
Yes
BTEMP lines. If
OK –>
Yes UEM regulators
are not working
Change UEM

Measure Measure
32.6kHz Sleep Clk No 32.6kHz Sleep Clk No
Check B200,
from testpoint J404 from B200. C209, C210
Is it OK ? Is it OK ?

Yes Yes
Change UEM

Measure Check R661,

No
13MHz RFClk from R420. Measure 26MHz RFClk No C661, R660,
Is it OK ? from C660. C660 if OK
Is it OK ? change G660

Yes Yes Check R420,

C420 if OK
change N600

Measure PURX No
signal from testpoint J402 Change UEM
Is it high (1.8V)?

Yes

Jammed
Page 2

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Jammed
Page 2

Yes Measure watchdog No

Phone shutdown after signal CBUSDA from Change UPP
30s testpoint J414
Is it OK ?

No

Measure DBUSClk No
1MHz signal
from testpoint J413
Is it OK ?

Yes

No Measure FBUSRX No
Read phone info. Change UEM
signal during phone info read
Is it OK ?
from testpoint J412
Is it OK ?

Yes Yes

Measure FBUSTX No
signal during phone info read Change UPP
from testpoint J411
Is it OK ?

Yes
Change LA5
module Retest
Change UEM

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Charging fault

Charger Connect
(ACP–7)
charger

Battery bar No
Retest
doesn‘t work (scroll)

Yes

Check X100,
Measure voltage No V100, C103,
over (TVS) V100. C100, F100,
Is it > 3.0 Vdc ? L100
and line

Yes

Read BTEMP value. Check

(Compare it to ambient No X101,C109
temperature) R202, C240,
Is it ~ 25 C (0319) ? R203 and line.

Yes

Remove (fuse) F100 No

and measure current. Change UEM
Is it ~350...390 mA ?

Yes
Retest

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SIM card is out of order (insert SIM card)

SIM card

Check BSI line

X101, C241,
Insert SIM card Yes No R203, C109,
Set phone LOCAL mode
faults R202.
Is it OK ?
If OK –>
Change UEM

No Yes

Check X386

Check VSIM line,X386,

No C203, C389.
Measure VSIM voltge If OK –> Change R388.
from X386 If still wrong VSIM
Is it 3V ? voltage –> Change UEM

Yes

Check SIM
No Check SIM lines.
power UP sequency
If OK –> Change R388.
(Page 35 figure 19)
If still fail –> Change UEM
Is it OK ?

Yes

Change UPP
END

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Audio fault

Audio
faults

No Try change earpiece. Yes

Is earpiece working? Retest
Is it working now ?

Yes No

Set phone in LOCAL mode.

Use Phoenix Audio Test.
Set EXT IN, HP OUT, LOOP ON.

Measure DC Check L151, C160,

offset voltage No R164 and line.
from Earpiece pads. If OK
Is it ~1.38V ? –> Change UEM

Yes

Check L106, C112,

R161, C163, R166,
Measure MICB2 No C165, R167 and
voltage from XMICP pads
line.
(L106) .
If OK
Is it ~2.2V ?
–> Change UEM

Yes
Audio
faults 2 Earpiece
2

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Earpiece
2

Connect EXT audio signal 1kHz

(sine) (¨200mVp–p) in XMICP pads
and Ground in XMICN

Measure sine signal No Measure sine signal Yes

from earpiece pads. from UEM (R156) Change UEM.
Is it ~880mVp–p ? Is it ~130mVp–p ?

Yes No

Check R156, C153,

C155, R166, R167,
Retest C163, R161 and
line.

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Audio
faults 2

No Try change bottom Yes

Is microphone working? connector X100. Retest
Is it working now ?

Yes No

Set phone in LOCAL mode.

Use Phoenix Audio Test.
Set HP IN, EXT OUT, LOOP ON.

Check L105,
C105, C152,
Measure MICB1 No C156, R152,
voltage from MICP pads. C168, C166,
Is it ~2.1V ? C215 and line.
If OK –>
Change UEM

Yes

Check C151,
R157, C105,
C154 and line.
If OK –>
Change UEM

Audio
faults 3

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Audio
faults 3

No Measure VBATT No
Is BUZZER working? voltage from B301. Check VBATT
Is it OK? line

Yes Yes

Set phone in LOCAL mode.

Use Phoenix Audio Test.
Set Buzzer volume ON.

Measure Buzzer
Yes Change
control signal
BUZZER
from BUZZER (C307).
(B301)
Is it 1kHz pulses ?

No

Check C306,
C307, C308
and line.
IF OK –>
Change UEM

END

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Display fault

Display
faults

Set phone into local mode.

Start Display test with Phenix
Try change UI module Yes
Retest
Is it working now ?

Are the UI–module No

No
led’s turned on ?

Check X303

Yes

Measure signal
from X303 pin. 2. Yes
Is it 128 Hz Check X303
~3.3Vp–p ?

No

Check R306 If OK. Check R304

Measure VBATT No
and VBATT
from V300 pin. 4 line
Is it OK?

Yes Check control

signal line if OK
Change UEM
Measure
PWM LED‘s No
control signal from UEM
Check R305,
Is it 128 Hz
V300, V329
~3.8Vp–p ?
and line

Yes
Display
faults 2

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Display
faults 2

Are the display No

led’s turned on ?

Yes Measure signal

fromV301 pin. 3. Yes Check LED‘s
Is it 128 Hz and line
~3.3Vp–p ?

No

Measure VBATT No Check R307

from V301 pin. 4 and VBATT
It is OK? line

Yes Check control

signal line.
If OK,
Change UEM
Measure
PWM LED‘s No
control signal from UEM
Check R305,
Is it 128 Hz
V301, V329
~3.8Vp–p ?
and line

Yes

Display
faults 3

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Display
faults 3

Try change UI module Yes

Retest
Is it working now ?

No
Does the display start ?

No

Yes Check X300

Measure Check C303

VDD (2.78V) and No and lines.
VDDI (1.8V). If OK,
Is it OK? Change UEM

Yes

Measure No Check C302,

VOUT voltage.
X300 and lines.
Is it ~8.1V?

Yes

Check X300
Measure No and lines.
XRES, XCS.
If OK, change
Is it ~1.8 V?
UPP

Yes

END

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Keypad fault

Keypad
faults

Check R301,
No Measure voltage No C312, S300
Is the power key working ? from S300 and line.
Is it HIGH ? If OK –>
Change UEM

Yes Yes

Measure voltage
from S300 when Yes Yes Phone is
Chech S300.
power key is pressed. dead
Is it OK ?
Is it HIGH ?

No No
Change S300

Phone is
jammed

Keypad
faults 2

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Keypad
faults 2

Try change UI module. Yes

Retest
Is it working now ?

No
Is UI module keys working ? No

Check X303

Yes

Measure ROW0, Check ROW0 –

ROW1, ROW2, ROW3, No 4 Lines, X303.
ROW4 lines from X303. If OK change
Are they ~1.8V ? Z301. If still fail
change UPP

Yes

Check ROW0 –
Measure SLEEPX No 4 Lines, X303.
signal from J403 If OK change
when key is pressed. Z301. If still fail
Is it ~1.8V? change UPP

Yes

Check ROW0 –
When keypad No 4 Lines, X303.
is pressed, the led’s are If OK change
turned on ? Z301. If still fail
change UPP

Yes
Keypad
faults 3 Display
faults

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Keypad
faults 3

Check S301,
S302, lines.
No Measure ROW0 No If OK change
Is volume UP key working ? line from S301.
Z301.
Is it ~1.8 V ?
If still FAIL
change UPP

Yes Yes

Check S301
Measure COL1
and COL1 line.
from S301 when No If OK change
S301 is pressed
Z301.
Is there
If still FAIL
50us pulse ?
change UPP

Yes

Change UPP

Check S301,
S302, lines.
Is volume DOWN key No Measure ROW0 No If OK change
working ? line from S302.
Z301.
Is it ~1.8 V ?
If still FAIL
change UPP

Check S302
Yes Yes and COL4 line.
If OK change
Z301.
Measure COL4 If still FAIL
from S302 when No change UPP
S302 is pressed
Is there
END 50us pulse ?
Change UPP
Yes

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RF Troubleshooting

Introduction
Measurements should be done using spectrum analyzer with high–fre-
quency high–impedance passive probe (LO–/reference frequencies and
RF power levels) and oscilloscope with a 10:1 probe (DC–voltages and
low frequency signals).
The RF–section is build around one RF–ASIC (HAGAR N600). Before
changing HAGAR, please check following things: Supply voltages are OK
and serial communication coming from baseband to HAGAR.
Please note: Grounding of the PA module is directly below PA module
making it difficult to check or change. Most RF semiconductors are
static discharge sensitive! So ESD protection must be taken care of
during repair (ground straps and ESD soldering irons). HAGAR and PA
are moisture sensitive and must be pre–baked prior to soldering.
Troubleshooting discrete components (resistors, inductors and capaci-
tors) is done by checking component soldering. Capacitors can be
checked for shortening and resistor values using an ohmmeter, but re-
member in–circuit measurements are evaluated with caution.
Remember that all measured voltages or RF levels in this document are
rough figures. Especially RF levels vary due to different measuring equip-
ment or different probe grounding used . When using RF probe it is good
to use metallic tweezers to connect probe ground to PWB ground as
close to measurement point as possible.

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RF Key Components

EGSM LNA EGSM TX SAW

GSM1800 LNA GSM1800 TX balun
Dual RX SAW GSM1800 RX 2nd SAW
Dual coupler EGSM RX 2nd SAW Hagar RFIC 26MHz XO
Antenna switch VCO balun 4GHz VCO

Antenna pad FM receiver IC

FM IF filter 2
Dual PA
FM IF filter 1 FM diskriminator

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PWB Test Points

900 1st SAW out 1800 LNA out

1800 1st SAW out LNA_P LNAB_G
900_RX LNAB_P VR2 900 LNA out VrefRf02
900 antsw tx contr LNA_G VrefRf01 VR5 RX_I
1800 antsw contr VR4 VR6 RX_Q 26M xo out
AFC
1800_RX SLE
1800 SCLK
PA ctrl VR3
Antenna 4G VCO out
pad SDATA
900 VR7
PA ctrl 4G VCO ctrl
900 PA TX_I_0
bias FM audio
1800 PA bias Vtune
TX_Q_0
VR1a
900 Mod out FMdiscr. LCtank1
900 PA in 1800 Mod out IF out 1 LCtank2
1800 PA in IF out 2 13M clock

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Transmitter
General instructions
Connect test jig to computer with DAU9S cable or to FPS–8 Flash Prom-
mer with XCS–4 modular cable.
Make sure that you have PKD–1 dongle connected to computers parallel
port.
Connect DC power supply to module test jig with FLC–2 cable.
NOTE: When repairing or tuning transmitter use external DC supply with
at least 3A current capability. Set the DC supply voltage to 3.9V and set
the jumper connector on test jig to ”bypass” position.
Connect RF–cable to the module test jig (MJS–46) RF connector and to
measurement equipment or at least 10dB attenuator, otherwise the PA
may be damaged. Normally spectrum analyzer is used as measurement
equipment.
NOTE: Normally Spectrum analyzer maximum input power is +30dBm. It
is recommended to use 10dB attenuator on Spectrum analyzer input to
prevent damage.
Set the phone module to test jig and start Phoenix service sofware.
Initialize connection to phone. (use FBUS driver when using DAU9S and
COMBOX driver when using FPS–8)
Select product from the menu: File –> Choose product –> NPM–9
From toolbar set operating mode to ”Local”.
Activate RF controls window from the menu:
Maintenance –> Tuning –> RF Controls
From the RF controls window:
– Select band ”GSM900” or ”GSM 1800” (Default = ”GSM900”)
– Set Active unit to ”Tx” (Default = ”Rx”)
– Set Operation mode to ”Burst” (Default = ”Burst”)
– Set Tx data type to ”Random” (Default = ”All1”)
– Set Rx/Tx channel to 37 on GSM900 band or 700 on GSM1800 band
(Defaults)
– Set Tx PA mode to ”Free” (Default)
– Set power level to 5 (Default = 19) on GSM900 or to 0 (Default = 15)
on GSM1800

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Transmitter troubleshooting diagram

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Transmitter signals

TX_I_0, Tx on, Random data, Burst mode TX_Q_0, Tx on, Random data, Burst mode

900/1800 antsw tx contr, Tx on, Burst mode

900/1800 PA bias, Tx on, Burst mode 900/1800 PA ctrl, Tx on, Burst mode, High
power level

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G S MP O W Tu e Se p 2 5 1 3 : 4 8 : 5 9 2 0 0 1
RE F 4 1 . 0 d Bm ATT 40 dB A_ wr i t eB_ b l a n k
1 0 d B/

REF OFS
11. 0 dB

RB W
100 k Hz
VBW
100 k Hz
S WP
2. 0 s
CE NT E R 897. 400 MH z SPAN 2. 000 MH z

Tx out signal, 900 band, burst mode, channel 37

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Receiver
General instructions
Connect test jig to computer with DAU9S cable or to FPS–8 Flash Prom-
mer with XCS–4 modular cable. Make sure that you have PKD–1 dongle
connected to computers parallel port.

Connect DC power supply to module test jig with FLC–2 cable. Set the
DC supply voltage to 3.9V and set the jumper connector on test jig to
”bypass” position.
Connect RF–cable to the module test jig (MJS–46) RF connector and to
RF signal generator.
Set the phone module to test jig and start Phoenix service sofware.
Initialize connection to phone. Use FBUS driver when using DAU9S and
COMBOX driver when using FPS–8.
Choose product from the menu: File –> Choose product –> NPM–9.
From toolbar set operating mode to ”Local”.
Activate RF controls window from the menu: Maintenance –> Testing –>
RF Controls.
From the RF controls window:
– Select band ”GSM900” or ”GSM 1800” (Default = ”GSM900”)
– Set Active unit to ”Rx” (Default = ”Rx”)– Set Operation mode to
”Continuous” (Default = ”Burst”)
– Set AGC to ”8: FEG ON + 46 dB (Default = ”8: FEG ON + 46 dB”)
– Set Rx/Tx channel to 37 on GSM900 band or 700 on GSM1800 band
(Defaults)
Apply 942.46771 MHz (channel 37 + 67.710 kHz offset) or 1842.86771
MHz (channel 700 + 67.710 kHz offset) –90 dBm signal to the RF–con-
nector (remember to compensate for cable attenuation).
Measuring with an oscilloscope on ”RX_I” or ”RX_Q” this picture should
be seen on a working GSM900 or GSM1800 receiver:

Signal amplitude is 700 mVpp, DC offset 1.35 V and frequency 67 kHz. If

this picture is not seen, continue to the next page.

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Receiver troubleshooting diagram for GSM900

Apply –90dBm
942.46771MHz signal
from generator to anten-
na connector

Yes No Yes No No No

Oscilloscope at RX_I Change ge- Spectrumanalyzer Spectrumanalyzer Spectrumanalyzer Check An-

Signal 700mVpp nerator level 900 LNA out 900 1st SAW out 900_RX tenna switch
DC offset 1.35V Fre- to –50dBm –61 dBm –80 dBm –79 dBm Z500
quency 67.7kHz

Yes Yes

EGSM RX chain func- Check dual RX SAW

tional Yes Z520

No No

Oscilloscope Oscilloscope Check Base-

LNA_G 2.7V VR4 2.7V band
LNAB_G 2.7V Check Hagar seri-
al interface Check
R501

Yes
Yes
Check Hagar
N600
Yes

Yes

Spectrumanalyzer Check C502

V500, RFout –57
dBm

No No

Oscilloscope Check V500,

V500, RFout 2.7V L500, R502
V500, RFin 0.8 V

Yes

Check V500, C501,

L502, L503

No

Spectrumanalyzer Check Z501, C505,

900 bal out C506, L501
–66 dBm

Yes No

Oscilloscope Check Baseband

VR4 2.7V
Check Hagar serial All spectrumanalyzer reading
interface (burst mo- values are measured with 1
de) kohm passive probe (use
tweezers to connect the
probe ground to the nearest
Yes No PWB ground). Reading value
is represented without +26
Spectrumanalyzer Synthesizer troubles- dB compensation.
4G VCO out hooting
3769.6MHz
∼–30 dBm (*

Yes
* Spectrumanalyzer
Check Hagar N600 reading with 1 kohm
passive probe (right val-
ue add +26 dB)

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Receiver troubleshooting diagram for GSM1800

Apply –90dBm
1842.86771MHz signal
from generator to anten-
na connector

Yes No Yes No No No

Oscilloscope at RX_I Change ge- Spectrumanalyzer Spectrumanalyzer Spectrumanalyzer Check An-

Signal 700mVpp nerator level 1800 LNA out 1800 1st SAW out 1800_RX tenna switch
DC offset 1.35V Fre- to –50dBm –61 dBm –77 dBm –78 dBm Z500
quency 67.7kHz

Yes Yes

GSM1800 RX chain Check dual RX SAW

functional Yes Z520

No No

Oscilloscope Oscilloscope Check Base-

LNA_P 0V VR4 2.7V band
LNAB_P 2.7V Check Hagar seri-
al interface (burst
mode)

Yes
Yes
Check Hagar
N600

Yes
Yes

Spectrumanalyzer Check C552

V550,
RFout –58 dBm

No No

Oscilloscope Check V550,

V550, RFout 2.6V R551, L550,
V550, RFin 0.8 V R558

Yes

Check V550, C551,

L552

No

Spectrumanalyzer Check Z551, C555,

1800 bal out C556, L551
–66 dBm

Yes No

Oscilloscope Check Baseband

VR4 2.7V
Check Hagar serial All spectrumanalyzer reading
interface (burst mo- values are measured with 1
de) kohm passive probe (use
tweezers to connect the
probe ground to the nearest
Yes No PWB ground). Reading value
is represented without +26
Spectrumanalyzer Synthesizer troubles- dB compensation.
4G VCO out hooting
3685.6MHz
∼–30 dBm (*

Yes
* Spectrumanalyzer
Check Hagar N600 reading with 1 kohm
passive probe (right val-
ue add +26 dB)

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LNA gainstep checking GSM900 & GSM1800

900 LNA out 1800 LNA out

– RF–level at antenna port eg. –50 dBm – RF–level at antenna port eg. –50 dBm
– RX continuous mode (local mode) – RX continuous mode (local mode)
– difference between AGC –settings – difference between AGC –settings
”FEG on” and ”FEG off” ”FEG on” and ”FEG off”
roughly 25 dB (using 250 ohm roughly 30 dB (using 250 ohm passive
passive RF–probe) RF–probe)

LNAB_G LNAB_P
– RX continuous mode (local mode) – RX continuous mode (local mode)
– 2,6 V DC voltage ”FEG ON” – 2,7 V DC voltage ”FEG ON”
– 0 V DC voltage ”FEG OFF” – 0 V DC voltage ”FEG OFF”

LNA_G 1800 LNA_P

– RX continuous mode (local mode) – RX continuous mode (local mode)
– 2,7 V DC voltage ”FEG ON” and ”FEG – 0 V DC voltage ”FEG ON”
OFF” – 1.9 V DC voltage ”FEG OFF”

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Synthesizer
General instructions
Connect test jig to computer with DAU–9S cable or to FPS–8 Flash Prom-
mer with XCS–4 modular cable.
Make sure that you have PKD–1 dongle connected to computers parallel
port.
Connect DC power supply or FPS–8 to module test jig with FLC–2 cable.
Set the DC supply voltage to 3.9V and set the jumper connector on test
jig to ”bypass” position.
Set the phone module to test jig and start Phoenix service sofware.
Initialize connection to phone. (use FBUS driver when using DAU–9S and
COMBOX driver when using FPS–8)
Select product from the menu: File –> Choose product –>NPM–9
From toolbar set operating mode to ”Local”.
Activate RF controls window from the menu:
Maintenance –> Tuning –> RF Controls
From the RF controls window:
– Select band ”GSM900” or ”GSM 1800” (Default = ”GSM900”)
– Set Active unit to ”Rx” (Default = ”Rx”)
– Set Operation mode to ”Continuous” (Default = ”Burst”)
– Set Rx/Tx channel to 37 on GSM900 band or 700 on GSM1800 band
(Defaults)

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Synthesizer troubleshooting diagram

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Synthesizer signals

26MHz XO out 13MHz clock

4GHz VCO ctrl 4GHz VCO ctrl

900 RX, channel 124, continuous mode 1800 TX, channel 512, continuous mode

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Fr i Ma y 1 1 1 3 : 0 3 : 2 6 2 0 0 1
REF – 2 0 . 0 d Bm ATT 10 dB A_ v i e wB_ b l a n k
1 0 d B/
MA R K E R
3 . 6 1 0 4 0 0 GH z
MK R – 3 0 . 7 2 d Bm
3. 610400 GH z

RB W
1 0 k Hz
VBW
1 0 k Hz
S WP
5 0 ms
CE NT E R 3. 6104000 GH z SPAN 2. 000 MH z

4GHz VCO output, 1800 band, RX on, continuous mode

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FM Radio troubleshooting

FM Radio component layout

Components L101, C101 and C102 are not shown in picture. Compo-
nents are placed in baseband section.

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FM Radio troubleshooting diagram

Note 1. RF test signal parameters:

– Amplitude, A, –67.0 dBm
– Carrier ferquency, fc , 98,000 MHz
– Deviation, ∆f, 75 kHz
– Modulating frequency fm , 1,000 kHz
(RF generator internal)

Note 2. Use 10x probe. Compare measured RF signal level to a known good product.

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FM Radio signals

Audio out from PWB test point – with FM Audio out from test jig connector – with FM
test signal. test signal, volume 100%.

G S MP O W Fr i Au g 3 1 0 7 : 4 0 : 2 1 2 0 0 1 G S MP O W Fr i Au g 3 1 0 7 : 4 2 : 5 6 2 0 0 1
RE F – 3 0 . 0 d Bm ATT 0 dB A_ v i e wB_ b l a n k RE F – 3 0 . 0 d Bm ATT 0 dB A_ v i e wB_ b l a n k
1 0 d B/ 1 0 d B/

CE NT E R CE NT E R
98. 0000 MH z 108. 7000 MH z

REF OFS REF OFS

0. 0 dB 0. 0 dB

RBW RB W
1 0 k Hz 1 0 k Hz
VBW VBW
1 0 k Hz 1 0 k Hz
S WP S WP
2. 0 s 2. 0 s
CE NT E R 98. 0000 MH z SPAN 500 k Hz CE NT E R 108. 7000 MH z SPAN 500 k Hz

LC tank 1 – with FM test signal. LC tank 2 – with FM test signal.

G S MP O W Fr i Au g 3 1 0 7 : 4 8 : 1 8 2 0 0 1 G S MP O W Fr i Au g 3 1 0 7 : 4 6 : 3 1 2 0 0 1
RE F – 3 0 . 0 d Bm ATT 0 dB A_ v i e wB_ b l a n k REF – 3 0 . 0 d Bm AT T 0 dB A_ v i e wB_ b l a n k
1 0 d B/ 1 0 d B/

SPAN SPAN
1. 000 MH z 1. 000 MH z

REF OFS REF OFS

0. 0 dB 0. 0 dB

RBW RB W
1 0 k Hz 1 0 k Hz
VBW VBW
1 0 k Hz 1 0 k Hz
S WP S WP
2. 0 s 2. 0 s
CE NT E R 10. 7000 MH z SPAN 1. 000 MH z CE NT E R 10. 7000 MH z SPAN 1. 000 MH z

IF out 1 – with FM test signal. IF out 2 – with FM test signal.

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