Nokia 6610 - Cell Phone 625 KB Guide

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NHL-4/4U Companyconfidential
Troubleshooting Instructions CCS Technical Documentation
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CCS Technical Documentation Troubleshooting Instructions
Company confidential NHL-4/4U
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RF Troubleshooting ....................................................................................................... 4
Introduction to RF troubleshooting .............................................................................4
RF Key component placement .....................................................................................5
RF Measurement points ...............................................................................................6
GSM900 & GSM1800 Transmitter................................................................................ 7
General instructions for Tx troubleshooting ............................................................. 7
Transmitter troubleshooting diagram........................................................................ 9
Pictures of transmitter signals................................................................................. 12
GSM900, GSM1800 and GSM1900 Receiver............................................................. 14
General instructions for Rx troubleshooting........................................................... 14
Troubleshooting diagram for GSM900 receiver..................................................... 18
Troubleshooting diagram for GSM1800 receiver................................................... 19
Troubleshooting diagram for GSM1900 receiver................................................... 20
Synthesizer................................................................................................................... 21
General instructions for synthesizer troubleshooting.............................................. 21
Synthesizer troubleshooting diagram...................................................................... 22
Pictures of synthesizer signals................................................................................. 23
Baseband troubleshooting............................................................................................ 25
Main Troubleshooting Diagram ................................................................................25
Phone is dead .............................................................................................................26
Flash Programming Fault ..........................................................................................27
Phone is jammed ........................................................................................................28
SIM card fault (Insert SIM / Card rejected) ...............................................................29
Keypad Fault ..............................................................................................................30
Display Fault ..............................................................................................................32
Illumination fault .......................................................................................................33
Charger Fault .............................................................................................................34
Accessory Fault .........................................................................................................35
Audio Fault ................................................................................................................36
FM Radio troubleshooting ........................................................................................... 37
FM Radio component layout .....................................................................................37
FM Radio troubleshooting diagram ...........................................................................38
Notes to "FM Radio troubleshooting diagram"....................................................... 38
Diagrams of FM radio signals................................................................................. 40

NHL-4/4U Companyconfidential
Troubleshooting Instructions CCS Technical Documentation
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CCS Technical Documentation Troubleshooting Instructions
Company confidential NHL-4/4U
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NHL-4/4U Companyconfidential
Troubleshooting Instructions CCS Technical Documentation
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CCS Technical Documentation Troubleshooting Instructions
Company confidential NHL-4/4U
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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

NHL-4/4U Companyconfidential
Troubleshooting Instructions CCS Technical Documentation
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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