Nokia NHL-4J Series Guide

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5)7URXEOHVKRRWLQJ 
,QWURGXFWLRQWR5)WURXEOHVKRRWLQJ 
5).H\FRPSRQHQWSODFHPHQW
5)0HDVXUHPHQWSRLQWV
*60 *607UDQVPLWWHU
*HQHUDOLQVWUXFWLRQVIRU7[WURXEOHVKRRWLQJ 
7UDQVPLWWHUWURXEOHVKRRWLQJGLDJUDP 
3LFWXUHVRIWUDQVPLWWHUVLJQDOV 
*60 *60DQG*60 5HFHLYHU
*HQHUDOLQVWUXFWLRQVIRU5[WURXEOHVKRRWLQJ 
7URXEOHVKRRWLQJGLDJUDPIRU*60 UHFHLYHU 
7URXEOHVKRRWLQJGLDJUDPIRU*60UHFHLYHU 
7URXEOHVKRRWLQJGLDJUDPIRU*60 UHFHLYHU 
6\QWKHVL]HU 
*HQHUDOLQVWUXFWLRQVIRUV\QWKHVL]HUWURXEOHVKRRWLQJ
6\QWKHVL]HUWURXEOHVKRRWLQJGLDJUDP 
3LFWXUHVRIV\QWKHVL]HUVLJQDOV
%DVHEDQGWURXEOHVKRRWLQJ 
0DLQ7URXEOHVKRRWLQJ'LDJUDP 
3KRQHLVGHDG 
)ODVK3URJUDPPLQJ)DXOW 
3KRQHLVMDPPHG
6,0FDUGIDXOW,QVHUW6,0&DUGUHMHFWHG
.H\SDG)DXOW
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Transmitter troubleshooting diagram
Check output signal level:
TX signal found ?
Yes Tune
dead
start TX power level
Tune Tx DAC values
No
PA & ant switch
TX troubleshooting TX OK
+32...+33dBm @897.4 MHz (GSM900)
+29...+30dBm @1747.8 MHz
(GSM1800 & GSM1900)
OK ?
Check
all power
levels,
OK ?
TX power
levels,
OK ?
No
Yes
No Check output signal
on 500 MHZ span
Signal found on
incorrect frequency ?
Yes Synthesizer
troubleshooting
Check with RF probe
signal level on
PA input >=0dBm (*
OK ?
Yes
HELGA
troubleshooting
No
Yes
tuning and check
tuned RAC values:
Highest level~700...900
Lowest level ~190...210
Base levle ~160...190
Major differences ?
Check with oscilloscope:
PA ctrl voltage
>1.5V peak OK ?
No
troubleshooting
No
Check control loop
components
OK ? Replace HELGA
*(When 1kOhm passive probe is used,
correct the measurement result by +26dB
Replace
faulty
component(s)
Yes
Yes
Yes
Yes

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HELGA
troubleshooting
Baseband
troubleshooting
Synthesizer
troubleshooting
Check with oscilloscope:
-TXI/TXQ signals
--VR1, VR2, VR4, VR5, VR6 = 2.8V
-VrefRF01 = 1.35 V
-HELGA serial interface
-TXP & TXC signals
OK ?
No
Check with RF probe:
-4G VCO out signal
- 3589.6 MHz (GSM900)
-3495.6 MHz (GSM1800)
- 3760 MHz (GSM1900)
Level >-10dBm (*OK ?
No
dead
Replace HELGA
Yes
Check modulator
output components
OK ?
Replace
faulty
component(s)
*(When 1kOhm passive probe is used,
correct the measurement result by +26dB

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PA& ant switch
troubleshooting
Yes
Check with RF probe
signal level on
PAinput >=0dBm (*
OK ?
Yes
Replace
ant. switch
Yes *(When 1kOhm passive probe is used,
correct the measurement by +26dB
Check with
oscilloscope:
-VANT_1 (GSM900)
-VANT_2 (GSM1800)
-VANT_3 (GSM1900)
OK ?
Check with
oscilloscope:
-VBATT ~4V
- VTXB = 2.8 V pulsed
- VTxLO_GSM = 0V (GSM900)
OK ?
Check
VANT lline components
OK ?
Replace
PA
Replace
HELGA
Replace
faulty
component(s)
Check components
around PA
OK ?
Replace
faulty
component(s)
Yes
Yes
Yes
No
No
No
No

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GSMPOW Tue Sep 25 13: 48: 59 2001
REF OFS
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No
No
Yes
Yes
NoNo
Yes
No
Yes
NoYes
Yes
Yes
Apply –90dBm
942.46771MHz signal
from generator to anten-
na connector
Oscilloscope at RX_I
Signal 700mVpp
DC offset 1.35V***
Frequency 67.7kHz
No
Change ge-
nerator level
to –50dBm
Spectrumanalyzer
Antenna Switch
outputs, GSM900
–88 dBm
Spectrumanalyzer
Antenna Switch
input
–84 dBm
Oscilloscope
VR1,3...6 2.7V
Check HELGA serial
interface
(burst mode)
Synthesiszer trou-
bleshooting
Spectrumanalyzer
4G VCO out
3769.6MHz
∼–30 dBm (*
Oscilloscope
VANT_1...3 0V Oscilloscope :
Check HELGA
serial interface
(burst mode)
Check HELGA
N500
Check Base-
band
* Spectrumanalyzer
reading with 1 kohm
passive probe (right val-
ue add +34 dB)
All 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
+34 dB compensation.
900RX chain
functional
Check C831,
L811
Check Antenna
switch
Z800
Spectrumanalyzer
HELGA inputs
GSM900
–89 dBm
Check L809
L810
Check Base-
band
No
Yes
Yes
Check HELGA
N500
* ** DC–level of RXI/RXQ in
continuous mode will decrease
slowly.
The original level can be resto-
red by rewriting gain set.

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Yes
No
Yes
No
Yes
Yes
Yes
NoNo
Yes
Yes
NoNoYesNoYes
Apply –90dBm
1842.86771MHz signal
from generator to anten-
na connector
Oscilloscope at RX_I
Signal 140mVpp
DC offset 1.35V ***
Frequency 67.7kHz
Change ge-
nerator level
to –50dBm
Spectrumanalyzer
Antenna switch out-
puts,
1800 LNA out
–61 dBm
Spectrumanalyzer
Antenna Swithc input
-84 dBm
GSM1800 RX chain
functional
Oscilloscope
VR1,3...6 2.7V
Check HELGA serial
interface
(burst mode)
Check C838, C839,
L821. L 872,
C836, C837,
V801
Oscilloscope
VANT_1...3 0V Oscilloscope
Check HELGA se-
rial interface (burst
mode)
Check HELGA
N600
Check Base-
band
* Spectrumanalyzer
reading with 1 kohm
passive probe (right val-
ue add +26 dB)
All 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 +26
dB compensation.
Check C831,
L811
Check Antenna
Switch Z800
Spectrumanalyzer
HELGA inputs
GSM 1800
–88 dBm
Check Base-
band
No Synthesiszer trou-
bleshooting
Spectrumanalyzer
4G VCO out
3769.6MHz
∼–30 dBm (*
Yes
Check HELGA
N500
* ** DC–level of RXI/RXQ in
continuous mode will decrease
slowly.
The original level can be resto-
red by rewriting gain set.

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Yes
Yes
Yes
Yes
NoNo
Yes
Yes
NoNoYesNoYes
Apply –90dBm
1842.86771MHz signal
from generator to anten-
na connector
Oscilloscope at
RX_I /RXQ
Signal 160mVpp
DC offset 1.35V ***
Frequency 67.7kHz
Change ge-
nerator level
to –50dBm
Spectrumanalyzer
Antenna Switch out-
put, GSM1900
–88 dBm
GSM1800 RX chain
functional
Spectrumanalyzer
4G VCO out
3685.6MHz
∼–30 dBm (*
Oscilloscope
VANT_3 2.7VV
VANT_1/2 0V
Oscilloscope
LNA_VCC 2.6V
LNA_P 0 V
Oscilloscope
Check HELGA se-
rial interface (burst
mode)
Check HELGA
N500
Check Base-
band
Check C831,
L811
* Spectrumanalyzer
reading with 1 kohm
passive probe (right val-
ue add +26 dB)
All 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 +26
dB compensation.
Spectrumanalyzer
Antenna Switch input
–84 dBm
Spectrumanalyzer
HELGA inputs
GSM1900
–78 dBm
Check Antenna
switch Z800
Spectrumanalyzer
RX_SAW_out
–90 dBm Check Baseband
Oscilloscope
VR1,3...6 2.7V
Check HELGA serial
interface
(burst mode)
Check Baseband
Yes
Check HELGA
N500
Yes
Check V802,
C826, Z802,
C829, C8097,
C808
Oscilloscope
VR1,3...6 2.7V
Check HELGA serial
interface
(burst mode)
Yes
Check Baseband
Synthesiszer trou-
bleshooting
Check HELGA
N500
* ** DC–level of RXI/RXQ in
continuous mode will decrease
slowly.
The original level can be resto-
red by rewriting gain set.