Nokia 6820a Service Manual 08 nsb 9 trouble
CCS Technical Documentation
NSB-9 Series Transceivers
Troubleshooting Instructions
Issue 1 04/03 Nokia Corporation
NSB-9
Troubleshooting Instructions CCS Technical Documentation
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NSB-9
CCS Technical Documentation Troubleshooting Instructions
Table of Contents
Page No
RF Troubleshooting ....................................................................................................... 4
Introduction ..................................................................................................................4
EQUIPMENT NEEDED:.......................................................................................... 4
USEFUL HINTS ....................................................................................................... 4
TROUBLESHOOTING IN CASE OF RF TUNING FAIL ........................................5
Channel Select Filter Calibration .............................................................................. 5
RX Calibration .......................................................................................................... 5
RX AM Suppression Calibration .............................................................................. 5
RX Band Filter Response Compensation.................................................................. 5
TX Power Level Tuning............................................................................................ 5
TX IQ Tuning............................................................................................................ 5
TX 850 Troubleshooting ..............................................................................................6
Phoenix commands ................................................................................................... 6
TX1900 TROUBLESHOOTING ................................................................................9
Phoenix commands ................................................................................................... 9
RX850 troubleshooting ..............................................................................................12
Phoenix commands ................................................................................................. 12
RX1900 Troubleshooting ..........................................................................................15
Phoenix commands ................................................................................................. 15
Figures of signals and voltages in testpoints .............................................................18
FM Radio Troubleshooting ........................................................................................35
Introduction ............................................................................................................. 35
EQUIPMENT NEEDED......................................................................................... 35
FM RADIO SCHEMATICS ......................................................................................36
FM Radio layout...................................................................................................... 39
REFERENCE MEASUREMENT RESULTS ........................................................ 42
Baseband Troubleshooting........................................................................................... 45
PWB Test points ........................................................................................................45
Troubleshooting steps ................................................................................................51
Main troubleshooting tree ..........................................................................................53
Phone is dead .............................................................................................................55
Flash faults .................................................................................................................56
Phone is jammed ......................................................................................................58
Charging fault ............................................................................................................60
SIM card fault ............................................................................................................61
Audio faults ...............................................................................................................62
Display faults .............................................................................................................70
Keypad faults .............................................................................................................72
Flip faults ...................................................................................................................76
FM Radio doesn’t work .............................................................................................78
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Troubleshooting Instructions CCS Technical Documentation
RF Troubleshooting
Introduction
This document describes the methods of RF troubleshooting for Iris NSB-9 transceiver.
Fault finding charts of the most common fails are included in this document. Arrows are
marked with 9 (OK) and 8 (NOT OK), respectively. Measurement equipment is marked as:
DMM Digital Multimeter
OSC Oscilloscope
SA Spectrum Analyzer
Figures of typical signals and voltages at each testpoint are described in Chapter 8.
Location of testpoints are described in Chapters 9 and 10.
EQUIPMENT NEEDED:
NSB-9 module jig MJS-48, power and DAU-9S cables
DC power supply 3.9 VDC >3A
Radio Communication Tester with GSM850/1900 option
Spectrum analyzer and probe with frequency range up to 4 GHz
Digital multimeter (DMM)
Oscilloscope with 10:1 probe
PC with Phoenix software
USEFUL HINTS
Sometimes it is difficult to get reliable measurement results at high frequencies
(500...4000 MHz) because of probe properties etc. If measurement results of faulty
phone don't correspond to the results shown in this document it may be useful to measure a reference phone and finally, compare the results.
Special attention shall be paid with internal antenna. Visual inspection of antenna module (shape of radiator metal) is needed to verify that antenna is GSM850/1900 antenna not GSM900/1800 used in similar European product. Both antennas behave very similarly in MJF-32 jig so it may be impossible to distinguish them by doing measurements
over air interface.
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CCS Technical Documentation Troubleshooting Instructions
TROUBLESHOOTING IN CASE OF RF TUNING FAIL
Channel Select Filter Calibration
Calibration is done using internal calibration circuit (UEM sends and receives a test signal to/from Hagar). VCO (G650), RX-bandfilters (Z501, Z551) and TX-filter/balun (Z700,
T700) don't have any effect to the Channel Select Filter Calibration. Instead, baseband
shall be functional (=VCTCXO G660 is running). Any failure in Hagar, its supply voltages
or RX/TX IQ-lines may cause this calibration to be failed.
If baseband works and there are not any visible cause around Hagar (missing or broken
components etc.), Hagar shall be replaced at first place.
RX Calibration
The most probably reason for this is lack of gain in receiver chain. Check rx chain according to RX850/1900 fault finding charts. In GSM850 RX, components Z520, V500 and
Z501 should be checked. In GSM1900 RX, components Z520, V550 and Z551 should be
checked.
If signal seems to pass rx chains with adequate gain, VCO function shall be checked. It is
also possible that signal passes rx chain to Hagar and VCO is functional but signal
doesn't appear in RX IQ-lines. In this case, Hagar shall be replaced.
RX AM Suppression Calibration
RX AM Suppression Calibration limits (LOPI, LOMI, LOPQ and LOMQ) are so wide that the
calibration results can't exceed the limits. Instead, RSSI value measured after tuning may
be too high. Also in this case, replacing Hagar may improve the result.
RX Band Filter Response Compensation
If RX Calibration results are ok but this compensation fails, the most probably reason for
this is lack of gain (or too big gain) in receiver chain in some frequency. Check rx chain
according to RX850/1900 fault finding charts. Retest rx chain also in low and high channels. In GSM850 RX, components Z520 and Z501 should be checked. In GSM1900 RX,
components Z520 and Z551 should be checked.
TX Power Level Tuning
The most likely reason for this is lack of gain in transmitter chain. Check tx chain according to TX850/1900 fault finding charts. In GSM850 TX, components Z500, L750, N700
and Z700 should be checked. In GSM1900 TX, components Z500, L750, N700 and T700
should be checked.
If signal seems to pass tx chains with adequate gain, VCO function shall be checked. It is
also possible that signal doesn't appear in TX IQ-lines. In this case, baseband shall be
checked.
TX IQ Tuning
TX IQ tuning fails, if IQ-spikes in the spectrum can't be tuned low enough. If replacing
Hagar doesn't help with this issue, VCO component (G650) and components around it
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Troubleshooting Instructions CCS Technical Documentation
shall be checked.
TX 850 Troubleshooting
Phoenix commands
RF Controls ⇒ Band GSM 850 TX ⇒ Burst mode
Channel 190 ⇒ TX Power Level 10
TX PA Mode Free ⇒ TX Data Random
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CCS Technical Documentation Troubleshooting Instructions
Figure 1: Fault finding chart, TX850
Check VCTCXO
output signal at TP20
26 MHz
9
Check TX IQ signals
at TP21
9
Check TX modulator
output signal at TP24
836.6 MHz
OSC
OSC
SA
8
8
8
Check VCTCXO
supply voltage at TP3
2.78 VDC ± 3%
DMM
9
Check VCTCXO
control voltage at
TP13
1.1 VDC ± 200 mV
9
Change VCTCXO
G660
Check SHF VCO
output signal at TP40
3346.4 MHz
DMM
SA
8
8
8
Start baseband
troubleshooting (UEM)
Start baseband
troubleshooting (UEM)
Start baseband
troubleshooting (UEM)
8
Check VCO supply
voltage at TP7:
2.78 VDC ± 3%
DMM
9
9
DMM
Check Hagar ASIC
supply voltages at
TP4, TP5, TP6, TP8:
2.78 VDC ± 3%
TP10: 1.35 VDC ± 2%
TP1: 4.75 VDC ± 3.2%
9
Check VCO control
1.1 VDC ± 200 mV
Change
Hagar ASIC
N600
8
troubleshooting (UEM)
9
voltage at TP41:
DMM
89
Change
8
SHF VCO
G650
Start baseband
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99
Check PA output
signal at TP60
836.6 MHz
9
TP51, SCLK TP52,
8
SA
Check PA control
voltage at TP27
VBATT (∼3.9 VDC)
9
Change PA
N700
Check SDATA at
SLE TP53
9
Change
Hagar ASIC
N600
Check PA supply
voltage at TP9
9
OSC
8
signal at TP23
8
OSC
DMM
8
Check TXC
9
Change
Hagar ASIC
N600
Start baseband
troubleshooting (UPP)
Check VBATT path
from battery connector
to PA
OSC
Start baseband
8
troubleshooting
(UEM)
Check coupler output
signal at TP61
836.6 MHz
9
Check TX output
signal at TP30
836.6 MHz
9
TX is ok
SA
SA
8
8
Change
coupler
L750
Check antenna switch
control signal at TP62
2.78 V squarewave
OSC
9
Change
antenna
switch Z500
8
Change Hagar
ASIC
N600
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CCS Technical Documentation Troubleshooting Instructions
TX1900 TROUBLESHOOTING
Phoenix commands
RF Controls ⇒ Band GSM 1900 TX ⇒ Burst mode
Channel 661 ⇒ TX Power Level 10
TX PA Mode Free ⇒ TX Data Random
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Figure 2: Fault finding chart, TX1900
Check VCTCXO
output signal at TP20
26 MHz
9
Check TX IQ signals
at TP21
9
Check TX modulator
output signal at TP22
1880 MHz
OSC
OSC
SA
8
8
8
Check VCTCXO
supply voltage at TP3
2.78 VDC ± 3%
DMM
9
Check VCTCXO
control voltage at
TP13
1.1 VDC ± 200 mV
9
Change VCTCXO
G660
Check SHF VCO
output signal at TP40
3760 MHz
DMM
SA
8
8
8
Start baseband
troubleshooting (UEM)
Start baseband
troubleshooting (UEM)
Start baseband
troubleshooting (UEM)
Check VCO supply
voltage at TP7:
2.78 VDC ± 3%
8
DMM
9
9
DMM
Check Hagar ASIC
supply voltages at
TP4, TP5, TP6, TP8:
2.78 VDC ± 3%
TP10: 1.35 VDC ± 2%
TP1: 4.75 VDC ± 3.2%
9
Check VCO control
voltage at TP41:
2.7 VDC ± 200 mV
89
Change
Hagar ASIC
N600
8
Start baseband
troubleshooting (UEM)
8
9
DMM
Change
SHF VCO
G650
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99
Check PA output
signal at TP25
1880 MHz
9
TP51, SCLK TP52,
8
SA
Check PA control
voltage at TP26
VBATT (∼3.9 VDC)
9
Change PA
N700
Check SDATA at
SLE TP53
9
Change
Hagar ASIC
N600
Check PA supply
voltage at TP9
9
OSC
8
signal at TP23
8
OSC
DMM
8
Check TXC
9
Change
Hagar ASIC
N600
Start baseband
troubleshooting (UPP)
Check VBATT path
from battery connector
to PA
OSC
Start baseband
8
troubleshooting
(UEM)
Check coupler output
signal at TP28
1880 MHz
9
Check TX output
signal at TP30
1880 MHz
9
TX is ok
SA
SA
8
8
Change
coupler
L750
Check antenna switch
control signal at TP29
2.78 V squarewave
OSC
9
Change
antenna
switch Z500
8
Change Hagar
ASIC
N600
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Troubleshooting Instructions CCS Technical Documentation
RX850 troubleshooting
Phoenix commands
RF Controls ⇒ Band GSM 850 RX ⇒ Continuous mode
Channel 190 ⇒ AGC 8 FEG ON + 46 dB
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CCS Technical Documentation Troubleshooting Instructions
Figure 3: Fault finding chart, RX850
Apply input signal
881.667 MHz
-50 dBm
9
Check VCTCXO
output signal at TP20
26 MHz
OSC
9
Check RX signal at
antenna switch output
TP63
881.667 MHz
9
Check RX signal at
dual filter output TP64
881.667 MHz
SA
SA
8
8
8
Check VCTCXO
supply voltage at TP3
2.78 VDC ± 3%
DMM
9
Check VCTCXO
control voltage at
TP13
1.1 VDC ± 200 mV
DMM
9
Change VCTCXO
G660
8
8
Start baseband
troubleshooting (UEM)
Start baseband
troubleshooting (UEM)
Change antenna
switch Z500
Change dual filter
Z520
9
Check RX signal at
LNA output TP66
881.667 MHz
9
Check RX signal at
filter output TP68
881.667 MHz
9
SA
SA
Check LNA voltages
8
8
at TP65 1 VDC
TP67 2.6 VDC
Check LNA V500 and
other components
around it
Change filter Z501
9
DMM
If R501 and R502 are
8
ok, change Hagar
ASIC N600
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9
Apply input signal
881.667 MHz
-90 dBm
9
OSC
Check RX IQ signal at
TP37
9
Start baseband
troubleshooting (UEM)
Check SHF VCO
8
output signal at TP40
3526.4 MHz
Check Hagar ASIC
supply voltages at
TP4, TP5, TP6, TP8:
2.78 VDC ± 3%
TP10: 1.35 VDC ± 2%
TP1: 4.75 VDC ± 3.2%
9
SA
DMM
Start baseband
troubleshooting (UEM)
8
Check VCO supply
voltage at TP7:
2.78 VDC ± 3%
Check VCO control
voltage at TP41:
1.8 VDC ± 200 mV
8 9
Change
Hagar ASIC
N600
8
Start baseband
troubleshooting (UEM)
8
8
DMM
9
DMM
Change
SHF VCO
G650
9
Check SDATA at
TP51, SCLK TP52,
SLE TP53
9
Change
Hagar ASIC
N600
OSC
8
Start baseband
troubleshooting (UPP)
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CCS Technical Documentation Troubleshooting Instructions
RX1900 Troubleshooting
Phoenix commands
RF Controls ⇒ Band GSM 1900 RX ⇒ Continuous mode
Channel 661 ⇒ AGC 8 FEG ON + 46 dB
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Figure 4: Fault finding chart, RX1900
Apply input signal
1960.067 MHz
-50 dBm
9
Check VCTCXO
output signal at TP20
26 MHz
OSC
9
Check RX signal at
antenna switch output
TP31
1960.067 MHz
SA
9
8
8
Check VCTCXO
supply voltage at TP3
2.78 VDC ± 3%
DMM
9
Check VCTCXO
control voltage at
TP13
1.1 VDC ± 200 mV
DMM
9
Change VCTCXO
G660
8
8
Start baseband
troubleshooting (UEM)
Start baseband
troubleshooting (UEM)
Change antenna
switch Z500
Check RX signal at
dual filter output TP32
1960.067 MHz
9
Check RX signal at
LNA output TP33
1960.067 MHz
9
Check RX signal at
filter output TP36
1960.067 MHz
9
SA
SA
SA
8
Check LNA voltages
8
8
at TP34 2.6 VDC
TP35 0 VDC
Check LNA V550 and
other components
around it
Change filter Z551
9
DMM
Change dual filter
If R551 is ok, change
8
Hagar ASIC N600
Z520
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CCS Technical Documentation Troubleshooting Instructions
9
Apply input signal
1960.067 MHz
-90 dBm
9
OSC
Check RX IQ signal at
TP37
9
Start baseband
troubleshooting (UEM)
Check SHF VCO
8
output signal at TP40
3920 MHz
Check Hagar ASIC
supply voltages at
TP4, TP5, TP6, TP8:
2.78 VDC ± 3%
TP10: 1.35 VDC ± 2%
TP1: 4.75 VDC ± 3.2%
9
SA
DMM
Start baseband
troubleshooting (UEM)
8
Check VCO supply
voltage at TP7:
2.78 VDC ± 3%
Check VCO control
voltage at TP41:
3.3 VDC ± 200 mV
89
Change
Hagar ASIC
N600
8
Start baseband
troubleshooting (UEM)
8
8
DMM
9
DMM
Change
SHF VCO
G650
9
Check SDATA at
TP51, SCLK TP52,
SLE TP53
9
Change
Hagar ASIC
N600
OSC
8
Start baseband
troubleshooting (UPP)
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Figures of signals and voltages in testpoints
Figure 5: TP20: 26 MHz VCTCXO output signal
Figure 6: TP21: TX I/Q signal
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CCS Technical Documentation Troubleshooting Instructions
Figure 7: TP22: TX1900 modulator output signal
Figure 8: TP23: TXC signal from UEM ASIC
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Troubleshooting Instructions CCS Technical Documentation
Figure 9: TP24: TX850 modulator output signal
Figure 10: TP25: TX1900 PA output signal
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CCS Technical Documentation Troubleshooting Instructions
Figure 11: TP 26: TX1900 PA power control signal
Figure 12: TP27: TX850 PA power control signal
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Troubleshooting Instructions CCS Technical Documentation
Figure 13: TP 28: TX1900 signal at coupler output
Figure 14: TP29: Antenna switch control signal in TX1900 mode
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CCS Technical Documentation Troubleshooting Instructions
Figure 15: TP30: TX850 signal at antenna pad
Figure 16: TP30: TX1900 signal at antenna pad
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Troubleshooting Instructions CCS Technical Documentation
Figure 17: TP31: RX1900 signal at antenna switch output
Figure 18: TP32: RX1900 signal at dual SAW filter output
Page 24 Nokia Corporation Issue 1 04/03
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