Nokia 3510 Service Manual 9 nhm 8nx trouble
PAMS Technical Documentation
NHM-8NX Series Transceivers
Troubleshooting Instructions
Issue 1 05/02 ãNokia Corporation
NHM-8NX
Troubleshooting Instructions PAMS Technical Documentation
Table of Contents
Page No
Transceiver Troubleshooting ......................................................................................... 4
Troubleshooting steps ..................................................................................................4
General instructions................................................................................................... 4
Baseband Troubleshooting............................................................................................. 5
Baseband Testpoints ....................................................................................................5
Fault Finding Charts ....................................................................................................5
Phone is dead ...............................................................................................................7
Flash programming does not work ..............................................................................8
Power does not stay on or phone is jammed ................................................................9
Display information: "Contact Service" ....................................................................10
Phone does not register onto the network, or the phone cannot make a call .............11
SIM related faults ......................................................................................................12
Insert SIM card fault ............................................................................................... 12
SIM-Card rejected ................................................................................................... 13
Audio related faults ....................................................................................................14
Charging failure .........................................................................................................16
RF Troubleshooting ..................................................................................................... 18
General description of the RF circuits..................................................................... 18
Receiver................................................................................................................... 24
General Instructions for GSM900 RX Troubleshooting ......................................... 24
Fault Finding Chart for GSM900 Receiver............................................................. 26
General Instructions for GSM1800 RX Troubleshooting ....................................... 27
Fault Finding Chart for GSM1800 Receiver........................................................... 29
Measurement points in the receiver ........................................................................ 31
Transmitter .................................................................................................................32
Measurement points for the transmitter .................................................................. 32
General instructions for GSM TX troubleshooting................................................. 33
Fault finding chart for GSM900 transmitter ........................................................... 34
PCN TransmitterGeneral instructions for PCN TX troubleshooting ...................... 37
Synthesizer .................................................................................................................39
General instructions for Synthesizer troubleshooting ............................................. 39
26 MHz Reference Oscillator ( VCXO )................................................................. 39
VCO ........................................................................................................................ 41
Fault finding chart for PLL Synthesizer.................................................................. 41
Measurement points for the PLL............................................................................. 42
Frequency lists......................................................................................................... 45
Alignment ..................................................................................................................47
NHM-8NX manual align with Phoenix .................................................................. 47
RX calibration ............................................................................................................47
RX channel select filter .............................................................................................49
RX Band Filter Response ..........................................................................................50
Tx Power tuning ........................................................................................................51
TX power tuning GSM............................................................................................ 52
TX power tuning PCN............................................................................................. 55
I/Q tuning ...................................................................................................................57
RF control ..................................................................................................................59
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PAMS Technical Documentation Troubleshooting Instructions
Call testing .................................................................................................................60
List of Figures
Page No
Fig 1 Receiver signal path ...................................................................................................19
Fig 2 Transmitter signal path ...............................................................................................20
Fig 3 Synthesiser..................................................................................................................21
Fig 4 Key component location.............................................................................................22
Fig 5 Power supply configuration........................................................................................23
Fig 6 Supply points at UEM (D200)...................................................................................24
Fig 7 Supply point at Mjoelner (N600) ...............................................................................24
Fig 8 EGSM Receiver fault finding chart............................................................................26
Fig 9 RX900 I/Q signal waveform ......................................................................................27
Fig 10 GSM1800 receiver fault finding chart......................................................................29
Fig 11 RX1800 I/Q signal waveform ..................................................................................30
Fig 12 RX measurements point at the RX/TX Switch - Z700.............................................31
Fig 13 Measurements points at the RX-Filters – Z601/Z602 ..............................................31
Fig 14 RX I/Q Signals, Baseband shielding can UEM (D200) ...........................................32
Fig 15 TX measuremnet points in the PA ( N700 ) shielding can.......................................32
Fig 16 EGSM900 transmitter fault finding chart.................................................................35
Fig 17 VPCTRL_G & TXC.................................................................................................36
Fig 18 GSM1800 transmitter fault finding chart .................................................................38
Fig 19 VPCTRL_P & TXC ................................................................................................39
Fig 20 VCXO 26 MHz waveform .......................................................................................40
Fig 21 PLL fault finding chart .............................................................................................41
Fig 22 Measurement point for VCXO supply .....................................................................42
Fig 23 Measurement point for VCXO output......................................................................43
Fig 24 Measurement point for PLL .....................................................................................43
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NHM-8NX
Troubleshooting Instructions PAMS Technical Documentation
Transceiver Troubleshooting
Troubleshooting steps
The following hints should help to find the cause of the problem when the circuitry
seems to be faulty. This trouble shooting instruction is divided into sections.
1 Phone is totally dead
2 Power does not stay on or the phone is jammed
3 Flash programming does not work
4 Display is not working
5 Plug in SIM card is out of order (insert SIM card).
6 Audio fault
7 Charging fault
The first thing to do is carry out a through visual check of the module. Ensure in particular that:
a) there are no mechanical damages
b) soldered joints are OK.
General instructions
Most semiconductors are static discharge sensitive! ESD protection must be taken care
of during repair (ground straps and ESD soldering irons). Mjoelner, PA, UEM, UPP, and
Flash are moisture sensitive and must be pre-baked prior to soldering, if they have been
out of their vacuum package longer than the specified time.
• Connect test jig (MJS-37) to computer with DAU-9S cable or to FPS-8 Flash
Prommer with AXS-4 serial cable.
• Make sure that you have PKD-1 dongle connected to computer’s parallel port.
• Connect DC power supply to module test jig (MJS-37) with FLC-2 cable.
• Set the MJS-37 supply voltage to 8-12VDC. If the input-voltage exceeds 12VDC,
the MJS-37 jig may be damaged.
Note: By default the MJS-37 supplies the phone with 4.1VDC. If other output voltages is
needed, it is possible to modify MJS-37 to support this by removing R110 and mount S104.
See MJS-37 schematic for more info.
• When doing BB energy management (EM) calibrations use JBV-1 jig and DC supply voltage 12 – 15 V.
• JBV-1’s current consumption is ~ 40 mA with 3.9 V supply voltage and ~ 80
• Set the phone module to test jig (MJS-37) and start Phoenix service software.
Initialize connection to phone (use FBUS driver when using DAU-9S and COMBOX driver when using FPS-8).
mA with 15 V supply voltage.
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NHM-8NX
PAMS Technical Documentation Troubleshooting Instructions
Baseband Troubleshooting
Baseband Testpoints
Baseband testpoint PWB Placement
R306
DLIGHT
C230
VREFRF02
C231
VREFRF01
C222
VR4
C225
VR6
J416
EXTWRX
-
J419
FLSCLK
-
J420
FLSCSX
-
J417
EXTRDX
-
J418
FLS2CSX
-
J414
DBUSDA
-
J402
PURX
-
J413
DBUSEN1X
-
J404
SLEEPCLK
-
J408
CBUSENX
-
J406
CBUSCLK
-
J407
CBUSDA
-
J412
FBUSRX
J425
RFCLK
4
GND
6
SIM I/O
J410
MBUSRX
3
VSIM
2
RST
1
CLK
J150
HOOKINT
R310
KLIGHT
R166
MICB2
J403
SLEEPX
C156
MIC2P
C155
MIC2N
J413
DBUSCLK
J405
UEMINT
C218
VIO
J411
FBUSTX
J409
MBUSTX
C226
VR5
C223
VR2
C227
VR3
C224
VR7
C208
VCORE
C206
VANA
C205
VFLASH1
R183/1
HFCM
R183/2
HF
C157
HEADINT
PRODTP6
VPP
PRODTP7
MBUS
PRODTP2
FBUS TX
PRODTP3
FBUS RX
R161/1
EARP
R161/2
EARN
R164
MIC1N
R164
MIC1P
R165
MICB1
C100
VCHARIN
Fault Finding Charts
In this section, fault finding charts are provided for the most common NHM-8NX errors.
NOTE : Since both D200 (UEM) and D400(UPP) is underfilled, they can not be
replaced. If either D200 or D400 is defective, the whole PWB has to be dis-
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NHM-8NX
Troubleshooting Instructions PAMS Technical Documentation
carded.
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NHM-8NX
PAMS Technical Documentation Troubleshooting Instructions
Phone is dead
This means that the phone do not draw 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
Phone is dead
Yes
X101
VBAT = 3,6VDC
Yes
Z261, C261, Z264,
C264
Voltage = 3,6VDC
Yes
S300
Pin 1 & 3 is HIGH when
power-key is untouched
Yes
S300
Pin 1 & 3 is 0VDC(LOW)
when power-key is pressed
Yes
J404
Sleep-clock is
32.768 kHz, 1,8Vpp
Yes
J402
PURX = 1,8VDC,
1 sec. after power-key
is pressed
Yes
No
No
Z261, C261, Z264, C264
No
No
No
B200, C209, C210, PWB.
No
Check :
X101
Check :
Check :
R317, C310
Check :
S300, PWB
Check :
Else defective D200*
Check :
PWB.
Else defective D200*
C227
VR3 = 2,78VDC
Yes
J425
26 MHz clock min.
300mVACpp,
probe Cin=10-13 pF/10M
Yes
Check :
D450 (Flash).
Else defective D200*
No
No
Check :
C227, PWB.
Else defective D200*
Check :
C227, PWB.
Else defective D200*
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NHM-8NX
Troubleshooting Instructions PAMS Technical Documentation
Flash programming does not work
The flash programming can only be done via the pads on the PWB (J100).
In case of Flash failure in FLALI station, problem is most likely related to SMD problems.
Possible failures could be short-circuit 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
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).
Flash prgramming
do not work
Error from prommer:
"Phone doesn't set
FBUS_TX line low"
Yes
J100, R108
Check connection between
pad 1,2 & 3 on J100
and R108
Yes
J409, J410, J411, J412
Voltage level at 1,8VDC
Yes
Try reading MCU ID
with Phoenix.
Reading OK?
Yes
Try reading Flash ID
with Phoenix.
Reading OK?
No
No
No
No
Check :
R108, PWB
Check :
PWB.
Else defective D200*
Check :
PWB.
Else defictive D400*
Check :
Replace D450
Yes
Reflash phone
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PAMS Technical Documentation Troubleshooting Instructions
Power does not 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.
Power doesn't stay on,
or phone is jammed
J404
Sleep clock = 32.768 kHz,
1.8Vpp
Yes
J402
PURX = 1,8VDC,
1 sec. after power-key is
pressed
Yes
UI functionality,
and keys react
to pressure?
Yes
J425
26 MHz clock min.
300mVACpp,
probe Cin=10-13 pF/10M
Yes
Reflash phone
No
B200, C209, C210, PWB.
No
No
No
Check :
Else defective D200*
Check :
PWB.
Else defictive D200*
Check :
D450, Keymat,
Lightguide, PWB.
Else defective D400*
Check :
C425, C426, R425,
R426, N600(Mjoelner)
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NHM-8NX
Troubleshooting Instructions PAMS Technical Documentation
Display information: "Contact Service"
This error can only happen at power up where several self-tests is run. If any of these test
cases fails the display will show the message: "Contact Service".
It's individual test cases so the below lineup of error hunting's has no chronological
order. Use common sense and experience to decide which test case to start error hunting
at.
Display shows
"Contact Service"
Yes
AuxDa & UEMInt
SleepX & SleepClk
between UPP & UEM?
TXI/QD & RXI/QD?
SIM interface between
EarDa & MicDa
between
UPP and UEM?
MBUS interface
between
UPP and UEM?
between
UPP and UEM?
UPP & UEM
Key is stucked
No
R205
Check R205
(no short/open-circuit)
Check :
A-cover, Keymat, Lightguide,
PWB.
Check :
PWB.
Else defective D200*
or D400*
Error still present
Flash checksum
ASIC version vs. compilation flag, PMM checksum
PMM validity
Warrenty Information State
SIM-Lock
Reflash phone
Check :
Else defective D450 (FLASH)
PWB.
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NHM-8NX
PAMS Technical Documentation Troubleshooting Instructions
Phone does not register onto the network, or the phone cannot make a call
If the phone doesn't register to the network, the fault can be in either BB or RF. Only few
signals can be tested since several signals is 'burried' in one or more of the inner layers of
the PWB.
First of all check that SIM LOCK is not causing the error by using a Test-SIM card and
connect the phone to a tester.
Phone do not register to
or phone cannot make a call
network
C222, C233, C224, C225,
C226, C227
Voltage = ~2,78VDC
All during GSM frame-
call mode.
Use TXP on C646 as trigger
Yes
C230, C231
Voltage = ~1,35VDC
All during GSM frame (call mode)
Use TXP on C646 as trigger
Yes
J608, J609, J610
Check RF serial bus during
GSM-frame :
Logic HIGH = 1,8VDC
Logic LOW = 0VDC
RFBUSCLK (J608),
RFBUSDA (J609),
RFBUSEN1X (J610)
Yes
R601, R603
Check analog signals during
GSM-frame (RX slot):
RXIP/N (R601) = 0-1,45VDC
RXQP/N (R603) = 0-1,45VDC
Yes
R610, R611
Check analog signals during
GSM-frame (TX slot):
TXIP/N (R610) = 1-1,75VDC
TXQP/N (R611) = 1-1,75VDC
C222,C223, C224, C225,
No
No
No
No
No
C226, C227, PWB.
Else defective D200 or D400*
C230, C231, PWB.
Else defective
D200* or D400*
Else defective D200*
Else defective D200*
R610, R611,PWB.
Else defective D200*
Check :
Check :
Check :
PWB.
or D400*
Check :
PWB.
or D400*
Check :
or D400*
Yes
Check RF
Issue 1 05/02 ãNokia Corporation Page 11
NHM-8NX
Troubleshooting Instructions PAMS Technical Documentation
SIM related faults
Insert SIM card fault
The hardware of the SIM interface from UEM (D200) to the SIM connector (X387) 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”.
Display shows :
"Insert SIM Card"
Yes
Check for SIM voltage during power-up
Ch1 : VSIM
Ch2 : RESET
X387
Verify that phone checks for
1,8V-SIM, and then 3V-SIM
during power-up.
(See illustration below)
Yes
SIM Interface OK
No
Check :
X387, R386, PWB.
Else defective D200*
Ch3 : CLOCK
Ch4 : DATA
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PAMS Technical Documentation Troubleshooting Instructions
SIM-Card rejected
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.
Display shows :
"SIM Card Rejected"
Yes
VSIM = min. 1,6V(1,8V Card)
X387
VSIM = min. 2,8V(3V Card)
(See illustration below)
Yes
X387
ATR data can be seen at
SIM data pin.
Yes
SIM Interface OK
No
No
Check :
R386, PWB.
Else defective D200*
Check :
X387, R386, PWB.
For reference a picture with normal SIM power-up is shown below.
Normal SIM power-up sequence
Ch1 : VSIM
Ch2 : RESET
Ch3 : CLOCK
Ch4 : DATA
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NHM-8NX
Troubleshooting Instructions PAMS Technical Documentation
Audio related faults
Earpiece do not work
Replace :
Earpiece
Error still present
Z150, R161
Check Z150, R161 is
working correctly
(no short/open-circuit)
Yes
Defective D200*
No
Check :
R386, PWB.
Else defective D200*
Microphone do not work and
the isn't any mechanical
problem
C103, Z100
Check C103, Z100 is
working correctly
(no short/open-circuit)
Replace :
System Connoctor
Error still present
R165
Check voltage level on
R165 towards UEM (bias)
= 2,1V
Yes
R153
Check voltage level on
R153 towards mic-lines (bias)
= 1,0V - 1,4V
No
No
No
R153, R157,C151, C152,
Replace :
C103 and/or Z100
Check :
R165, C168, PWB.
Else defctive D200*
Check :
C153, C154, PWB.
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NHM-8NX
PAMS Technical Documentation Troubleshooting Instructions
Headset earpiece do not
work and the isn't any
mechanical problem
R183, Z102
Check R183, Z102 is
working correctly
(no open-circuit)
Defective D200*
Headset microphone do not
work and the isn't any
mechanical problem
R166
Check voltage level on R166
towards UEM (bias) = 2,1V
Yes
R151
Check voltage level on R151
towards UEM (bias)
= 1,0V - 1,4V
Yes
R152, R165, R168,
C155, C156, C172,
C170, C173, C174,
Z101
Check XMIC line to UEM
(D200)
No
No
No
No
Replace :
C183 and/or Z102
Replace :
C183 and/or Z102
Check :
R166, R151, C171
Replace :
Defective component
Error still present
Defective D200*
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NHM-8NX
Troubleshooting Instructions PAMS Technical Documentation
Charging failure
Phone is OFF - battery is
completely empty
(<=3,1VDC)
and no current from
charger when connected
L100
VCHAR > 2,1VDC
Yes
Defective D200*
Phone is ON or OFF - battery
nominal voltage (~3,6VDC)
and no current from
charger when connected
L100
VCHAR > 3,6VDC
Yes
Defective
D200 or D400*
No
F100, L100, V101, C100,
R200, System-connector.
No
F100, L100, V101, C100,
R200, System-connector.
Check :
Check :
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NHM-8NX
PAMS Technical Documentation Troubleshooting Instructions
Display info when
charger is connected :
"Not charging"
R206
Voltage on R206 towards
D200 is ~0,8VDC
when power is connected.
(BSI must be 75K)
Yes
No
Check :
X101, R202, R206, C240.
Voltage (use scope) on R207
R207
towards D200 is ~0,9VDC at
peak.
(BTEMP must be 47K)
Yes
R200
Voltage on R200 towards
D200 same as VBAT voltage
Yes
R200
Voltage rises slowly on
R200 towards D200 when
charger is connected.
Yes
Check :
PWB
No
No
No
Check :
X101, R202, R207, C220.
Check :
R200, PWB.
Else defective D200*
Check :
PWB.
Else defective D200*
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NHM-8NX
Troubleshooting Instructions PAMS Technical Documentation
RF Troubleshooting
Two types of measurements are used in the following. It will be specified if the measurement type is "RF" or "LF".
• RF measurements should be done with a Spectrum Analyser and a high-frequency 500 ohm passive probe, for example HP54006A. (Note that when measuring with the 500 ohm probe the signal will be around 20 dB attenuated. The
values in the following will have these 20 dB subtracted and represent the real
value seen on the spectrum analyser).
Note that the testjig have some losses which must be taken into consideration when
calibrating the test system.
• LF (Low frequency) and DC measurements should be done with a 10:1 probe and
an oscilloscope. The probe used in the following is 10MW/8pF passive probe. If
using another probe then bear in mind that the voltages displayed may be
slightly different.
Always make sure the measurement set-up is calibrated when measuring RF parameters
on the antenna pad. Remember to include the loss in the module repair jig when
realigning the phone.
Most RF semiconductors are static discharge sensitive. So ESD protection must be
taken during repair (ground straps and ESD soldering irons). Mjoelner and Bifrost is moisture sensitive so parts must be pre-baked prior to soldering.
Apart from key-components described in this document there are a lot of discrete components (resistors, inductors and capacitors) for which troubleshooting is done by checking if soldering of the component is done properly and checking if the component is
missing from PWB. Capacitors can be checked for short-circuiting and resistors for value
by means of an ohmmeter, but be aware in-circuit measurements should be evaluated
carefully.
In the following both the name EGSM and GSM900 will be used for the lower band and
both PCN and GSM1800 will be used for the upper band.
General description of the RF circuits
In the following general descriptions different colours are used in the block diagram. The
GSM 900 signal route is shown in red, the GSM1800 route in green and the common signal lines are shown in blue. Signal lines which is common for both
Receiver signal path
The signal from the antenna pad is routed to the RX/TX switch ( Z700). If no control voltage is present at VANT2 and VANT1 the switch works as a diplexer and the GSM900 signal is passed through the RX/TX switch to GSM-RX and the GSM1800 signal is passed to
DCS-RX.
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Figure 1: Receiver signal path
RX
Supply
filter
F
X
R
D
D
V
LNA
RX/TX
Z700
Ant
2
SAW
Z602
SAW
Z601
RX900
RX1800
RX1900
2
VANTL / VANTM
RX
GSM
TX
RX
Switch
PCN
TX
INPL
INML
INPM
INMM
INPH
INMH
Bias
LNA
LNA
LNA
RF
Controls
VDDDIG
Pregain
Pregain
22 22
1/2 1/4
BBAMP
BBAMP
LPF1
LPF1
B
B
X
R
D
D
V
DCN1
DCN1
Mjoelner
N600
BIQUAD
AGC
LPF2
BIQUAD
AGC
LPF2
From the RX/TX switch the GSM900 signal is routed to the SAW filter (Z602). The purpose of the SAW filter is to provide out-of band blocking immunity and to provide the
LNA in Mjoelner (N600) with a balanced signal. The front end of Mjoelner is divided into
a LNA and Pre-Gain amplifier before the mixers.
DCN2
DCN2
VRX
VR6
RXIP
RXIM
RXQP
RXQM
The output from the mixer is feed to Baseband part of Mjoelner where the signals amplified in the BBAMP and low pass filtered in LPF1 before the DC compensation circuits in
DCN1. The DCN1 output is followed by a controlled attenuator and a second lowpass filter LPF2. The output from LPF2 is DC centered in DCN2 before being feed to the BB for
demodulation.
The GSM1800 signal chain is similar to GSM900, the SAW filter numbered Z601.
Transmitter signal path
The I/Q signal from the BB is routed two the modulators for both 900 and 1800 MHz. The
output of the modulators is either terminated in a SAW filter ( Z603 ) for GSM 900 or a
balun for GSM1800. Both signals are amplified in buffers whereby a limiting effect takes
place to suppress some of the AM contents of the signal. The amplitude limited signal is
then amplified in the PA (N700) where the gain control takes place. In order to control
the TX level a sample of the signal is taken in a directional coupler ( L709 for GSM900
and L704 for GSM1800) and used in the power loop amplifier in Mjoelner to establish
the right output power. The TX signal from the couplers is feed to the RX/TX switch, used
to select which signal to route to the antenna.
Issue 1 05/02 ãNokia Corporation Page 19
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