Nokia NHM-1 Series Guide

CCS Technical Documentation
NHM-1 Series Transceivers
Issue 1 11/03 Nokia Corporation.
Troubleshooting instructions

NHM-1
Troubleshooting instructions CCS Technical Documentation
Page 2 Nokia Corporation. Issue 1 11/03
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CCS Technical Documentation Troubleshooting instructions
NHM-1
Issue 1 11/03 Nokia Corporation. Page 3
Table of Contents Page No
RF Troubleshooting ....................................................................................................... 5
Introduction to troubleshooting ...................................................................................5
RF Key component placement .....................................................................................7
RF Measurement points ...............................................................................................8
Transmitter troubleshooting diagram ........................................................................10
Helgo Troubleshooting diagram ................................................................................11
PA and Antenna Switch Troubleshooting diagram ...................................................12
Diagrams of transmitter signals .................................................................................13
GSM900 & GSM1800 Receiver.................................................................................. 15
General instructions for Rx troubleshooting ..............................................................15
Troubleshooting diagram for GSM900 receiver ........................................................17
Troubleshooting diagram for GSM1800 receiver ......................................................18
GSM Synthesizer .......................................................................................................19
General instructions for synthesizer troubleshooting.............................................. 19
Synthesizer troubleshooting diagram ........................................................................20
Diagrams of synthesizer signals ................................................................................21
WCDMA 2100 Transmitter ......................................................................................... 22
WCDMA TX Troubleshooting diagram ....................................................................23
WCDMA2100 Receiver............................................................................................... 26
General instructions for Rx troubleshooting ..............................................................26
Troubleshooting diagram for WCDMA receiver:: ....................................................30
WCDMA Synthesizers................................................................................................. 32
General instructions for WCDMA RX- or TX-synthesizer troubleshooting .............32
WCDMA RX-synthesizer:...................................................................................... 33
WCDMA RX-synthesizer troubleshooting diagram .................................................34
Diagrams of WCDMA RX-synthesizer signal:....................................................... 35
WCDMA TX-synthesizer: .........................................................................................36
WCDMA TX Synthesizer troubleshooting diagram .................................................37
Diagrams of WCDMA TX-synthesizer signal:....................................................... 38
Baseband troubleshooting............................................................................................ 39
Main Troubleshooting Diagram ................................................................................39
Phone totally dead ......................................................................................................40
Flash programming problem ......................................................................................41
Phone jammed ...........................................................................................................42
Charging problem ......................................................................................................43
SIM card reading problem .........................................................................................44
Audio problem ...........................................................................................................45
Keypad problem .........................................................................................................46
Display problem .........................................................................................................47
Illumination problem .................................................................................................48
ACI Accessory problem ............................................................................................49
USB problem .............................................................................................................50

NHM-1
Troubleshooting instructions CCS Technical Documentation
Page 4 Nokia Corporation. Issue 1 11/03
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CCS Technical Documentation Troubleshooting instructions
NHM-1
Issue 1 11/03 Nokia Corporation. Page 5
RF Troubleshooting
Introduction to troubleshooting
Measurements should be done using Spectrum analyzer with high-frequency high-
impedance passive probe (LO-/reference frequencies and RF power levels) and Oscillo-
scope with a 10:1 probe (DC-voltages and low frequency signals)
The GSM RF-section is build around one RF-ASIC (HELGO N600). WCDMA RF is based on
RX ASIC REX and TX ASIC TEX. For easier troubleshooting, this RF troubleshooting docu-
ment is divided in to sections.
Before changing RF system-ASIC, please check following things: Supply voltages are OK
and serial communication coming from baseband to HELGO/REX/TEX.
Please note that the grounding of the PA module is directly below PA-module so it is dif-
ficult to check or change. Most RF semiconductors are static discharge sensitive! So
ESD protection must be taken care of duriong repair (ground straps and ESD soldering
irons). RF ASICs and PAs are moisture sensitive so parts must be pre-baked prior to sol-
dering.
Apart from key components described in this document here are a lot of discrete compo-
nents (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 PWB). Capacitor 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 fig-
ures. Especially RF levels varies due to different measuring equipment or different
grounding of the used probe. When using RF probe usually a good way is to use metallic
tweezers to connect probe ground to PWB ground as close to measurement point as pos-
sible.
Please be aware also that when testing transmitters, the TX power should be loaded
always with 50 ohm dummy load – never antenna!!. Especially in WCDMA, where extra
TX power in cell harms a lot the capacity or range of the cells.
Connect test jig to computer with DAU9S cable or to FPS-8 Flash Prommer 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.
Attention: 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 con-
nector on test jig to "bypass" position.

NHM-1
Troubleshooting instructions CCS Technical Documentation
Page 6 Nokia Corporation. Issue 1 11/03
Connect a RF-cable to the module test jig (MJS-46) RF connector to and to measurement
equipment or at least 10dB attenuator, otherfwise the PA may be damaged. Normally
Spectrum analyzer is used as measurement equipment.
Attention: Normally Spectrum analyzer maximum input power is +30dBm. It is recom-
mended 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 -> Open product -> NHM-1
From toolbar
- Set system mode to “GSM”
- Set operating mode to "Local"
Activate RF controls window from the menu
Maintenance -> Testing -> RF Controls
From the RF controls window
- Select system mode “GSM”
- 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

CCS Technical Documentation Troubleshooting instructions
NHM-1
Issue 1 11/03 Nokia Corporation. Page 7
RF Key component placement
Figure 1: RF component placement
19 MHZ
X
OWCDMA PA
Du
p
lexe
r
HE
X
RE
X
TE
X
Hel
g
o RFIC
WCDMA Tx VCO
GSM PA
Antenna switch
WCDMA Rx VCO
GSM VCO

NHM-1
Troubleshooting instructions CCS Technical Documentation
Page 8 Nokia Corporation. Issue 1 11/03
RF Measurement points
Figure 2: RF measurement points
TXQ
TXI
VREFRF01
VANT1
VANT2
C575
L633
L634
L636 TXI TXQ
L635
VR3 VR5
V
p
a
PAbias
C960
V
extre
g
1
R996
C999 Vbat
R971
N961L999
C995
PAin
p
ut
VR4
VR7
VCO OUT
TXC VR1
A
VBATT
_
RF
J800, RXI
J802, RXQ
ANT-
p
ort
RX-
p
ort
R816
RX VCO OUT
R843
C820
C813
R807
TX VCO OUT
C928
C920
C872
Ant port
RX port
RX VCO OUT
C820
C872
C928

CCS Technical Documentation Troubleshooting instructions
NHM-1
Issue 1 11/03 Nokia Corporation. Page 9
Figure 3: RF measurement points 2
RXQ RXI TXC
TXP

NHM-1
Troubleshooting instructions CCS Technical Documentation
Page 10 Nokia Corporation. Issue 1 11/03
Transmitter troubleshooting diagram
Figure 4: Transmitter troubleshooting
Check output signal level
~ 32.5 dBm @ 897.4MHz(GSM900)
~ 29.5 dBm @ 1747.8MHz(GSM1800)
OK?
Tx troubleshooting
Tx signal found?
Yes
Check with RF probe:
Signal level on PA input > 0dBm (*
OK?
Start Tx power level tuning
and check tuned DAC values:
Highest level ~ 700
Lowest level ~ 170
Base level ~ 150
Major differences?
Check with oscilloscope:
PA ctrl voltage > 1.5 peak,
OK?
Yes
PA & ant. switch
troubleshooting
Tx OK
Yes
Check all
power levels,
OK?
Tune Tx
power levels
OK?
No
Yes
Yes
Check output signal
on 500 MHz span.
Signal found on
incorrect frequency?
Synthesizer
troubleshooting
Helgo
troubleshooting
Tune Tx DAC values
Replace faulty
component(s)
Check control loop
components,
OK?
No
Replace Helgo
*(When 1kOhm passive probe is used
correct measurement result by +26dB
Yes
Yes
No
No
Y
esNo
No
No
Yes
No
No

CCS Technical Documentation Troubleshooting instructions
NHM-1
Issue 1 11/03 Nokia Corporation. Page 11
Helgo Troubleshooting diagram
Figure 5: HELGO troubleshooting
Check with oscilloscope:
- TXI/TXQ signals
- VR1A, VR2, VR3, VR4, VR5, VR7 = 2.8V
- VREFRf01 = 1.35V
- Helgo serial interface
- TXP/TXC signals
OK?
Check with RF probe
VCO out signal level t-10dBm,
3589.6 MHz (GSM900)
3495.6 MHz (GSM1800)
OK?
Check modulator
output components,
OK?
Replace faulty
component(s)
No
Yes
Yes
No
Baseband
troubleshooting
Synthesizer
troubleshooting
Replace Helgo
No
Yes
*(When 1kOhm passive probe is used
correct measurement result by +26dB
Helgo
troubleshooting

NHM-1
Troubleshooting instructions CCS Technical Documentation
Page 12 Nokia Corporation. Issue 1 11/03
PA and Antenna Switch Troubleshooting diagram
Figure 6: PA and antenna switch troubleshooting
Replace faulty
component(s)
Check with RF probe
PA output signal level, (*
OK?
Check with oscilloscope:
- VBATT_RF ~ 4V
- VTXP = 2.8V
pulsed
- = 0V,
OK?
VTXLO_G
Check components
around PA,
OK?
Check with oscilloscope
ant. switch Tx controls.
- VANT_1 (GSM900)
- VANT_2 (GSM1800)
OK?
Yes
Check ant.switch
Tx control lines
components,
OK?
Replace Helgo
Replace PA
No
Yes
No
Yes
No
Yes
No
Replace
ant. switch
Replace faulty
component(s)
PA & ant. switch
troubleshooting
*(When 1kOhm passive probe is used
correct measurement result by –26dB
Yes
Yes
No

CCS Technical Documentation Troubleshooting instructions
NHM-1
Issue 1 11/03 Nokia Corporation. Page 13
Diagrams of transmitter signals
TX I/Q at R607/R608, Tx on, burst mode, random data VPCTRL_G at R554/C565, Tx on, burst mode, power
level high
VPCTRL_P at R553/C564, Tx on, burst mode, power level
high, random data
VTX_B_G at C572, Tx on, burst mode
VTX_B_P at C573, Tx on, burst mode VANT_1 at C551, Tx on, burst mode VANT_2 at C552, Tx on, burst mode
TXP at J502 , Tx on, burst mode TXC at R606/C614, Tx on, burst mode, power level high

NHM-1
Troubleshooting instructions CCS Technical Documentation
Page 14 Nokia Corporation. Issue 1 11/03
Figure 7: Tx out signal, 900 band, burst mode, channel 37
A_wr i t eB_bl ank
CENTER 897. 400 MHz SPAN 2. 000 MHz
2. 0 s
SWP
100 kHz
VBW
100 kHz
RBW
10dB/
REF 41. 0 dBm ATT 40 dB
GSMPOW Tue Sep 25 13: 48: 59 2001
REF OFS
11. 0 dB

CCS Technical Documentation Troubleshooting instructions
NHM-1
Issue 1 11/03 Nokia Corporation. Page 15
GSM900 & GSM1800 Receiver
General instructions for Rx troubleshooting
Connect test jig to computer with DAU9S cable or to FPS-8 Flash Prommer 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 an RF-cable to the module test jig (MJS-46) RF connector and to RF signal gen-
erator.
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 -> Open product -> NHM-1
From toolbar
- Set system mode to “GSM”
- 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 "Burst" (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

NHM-1
Troubleshooting instructions CCS Technical Documentation
Page 16 Nokia Corporation. Issue 1 11/03
700 + 67.710 kHz offset) –90 dBm signal to the RF-connector (remember to compensate
for cable attenuation).
Measuring with an oscilloscope on "RX_" or "RX_Q" this picture should be seen on a
working GSM900 or GSM1800 receiver:
Figure 8: Oscilloscope screen shot
Signal amplitude is 152mVpp, DC offset 1,35V, frequency 67 kHz.
If this signal is not sen continue to the troubleshooting diagram for :

CCS Technical Documentation Troubleshooting instructions
NHM-1
Issue 1 11/03 Nokia Corporation. Page 17
Troubleshooting diagram for GSM900 receiver
Figure 9: GSM900 receiver troubleshooting
Phone in continuous mode, AGC setting 12
Oscilloscope at RxI:
- Signal 160mVpp
- DC offset 1.35V**
- Frequency 67.7kHz
Change
generator
level
–50dBm
Spectrumanalyzer:
Antenna switch
outputs, GSM900
–88dBm
Check C575
Oscilloscope:
VANT_1 = 0V
VANT_2 = 0V
Spectrumanalyzer:
Antenna switch
input –84dBm
Check Antenna
switch Z500
Spectrumanalyzer:
Helgo inputs
GSM900 –89dBm
Oscilloscope:
- VR1A, VR2, VR3,
VR4, VR5, VR7
- Check Helgo
serial interface
(burst mode)
Spectrunanalyzer:
4G VCO out
3769.6 MHz
–30dBm (*
Check L633, L634
Check Baseband
Synthesiszer
trobleshootin
g
Oscilloscope:
Check Helgo
serial interface
(burst mode)
NoNo
Check Helgo
GSM900 Rx
chain functional
No No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Check
baseband
Check Helgo
Apply –90dBm
942.46771 MHz
signal from generator
to antenna connector.
Yes
Yes
Yes
No
A
ll spectrumanalyzer
reading values are
measured with 2.5 kOhm
passive probe (use
tweezers to connect the
probe ground to the nearest
PWB ground). Reading
value is represented without
+34dB compensation
(* Spectrumanalyzer
reading with 1kOhm
passive probe (right
value add +26dB)
**DC-level of RxI/RxQ in
continuous mode will
decrease slowly. The
original level can be
restored by rewriting
gain set.
Yes

NHM-1
Troubleshooting instructions CCS Technical Documentation
Page 18 Nokia Corporation. Issue 1 11/03
Troubleshooting diagram for GSM1800 receiver
Phone in continuous mode, AGC setting 12
Oscilloscope at RxI:
- Signal 140mVpp
- DC offset 1.35V**
- Frequency 67.7kHz
Change
generator
level
–50dBm
Spectrumanalyzer:
Antenna switch
outputs, GSM1800
–87dBm
Check C575
Oscilloscope:
VANT_1 = 0V
VANT_2 = 0V
Spectrumanalyzer:
Antenna switch
input –84dBm
Check Antenna
Switch Z500
Spectrumanalyzer:
Helgo inputs
GSM1800 –88dBm
Yes
Oscilloscope:
- VR1A, VR2, VR3,
VR4, VR5, VR7 = 2.7V
- Check Helgo
serial interface
(burst mode)
Yes
Check Helgo
Spectrunanalyzer:
4G VCO out
3769.6 MHz
–30dBm (*
Check L635, L636
Check Baseband
No
No
Oscilloscope:
Check Helgo
serial interface
(burst mode)
Check
Baseband
Check Helgo
GSM1800 Rx
chain functional
No
NoNo
No No
Yes
YesYes
Yes
Yes
Yes
A
ll spectrumanalyzer
reading values are
measured with 1 kOhm
passive probe (use
tweezers to connect the
probe ground to the nearest
PWB ground). Reading
value is represented without
+26dB compensation
Synthesiszer
trobleshootin
g
Apply –90dBm
1842.86771 MHz
signal from generator
to antenna connector.
Yes
No
(* Spectrumanalyzer
reading with 1kOhm
passive probe (right
value add +26dB)
**DC-level of RxI/RxQ in
continuous mode will
decrease slowly. The
original level can be
restored by rewriting
gain set.
Yes

CCS Technical Documentation Troubleshooting instructions
NHM-1
Issue 1 11/03 Nokia Corporation. Page 19
GSM Synthesizer
General instructions for synthesizer troubleshooting
Connect test jig to computer with DAU9S cable or to FPS-8 Flash Prommer 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 DAU9S and COMBOX driver
when using FPS-8)
Select product from the menu
File -> Open product -> NHM-1
From toolbar
- Set system mode to “GSM”
- 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 Rx/Tx channel to 37 on GSM900 band or 700 on GSM1800 band (Defaults)

NHM-1
Troubleshooting instructions CCS Technical Documentation
Page 20 Nokia Corporation. Issue 1 11/03
Synthesizer troubleshooting diagram
Figure 10: Synthesizer troubleshooting