Nokia n80 User Manual page 219

RM-91; RM-92
RF Troubleshooting and Manual Tuning Guide
Introduction to RF troubleshooting.....................................................................................................................7-5
RF key component placement...............................................................................................................................7-6
Self test troubleshooting.......................................................................................................................................7-8
RF ASIC troubleshooting.........................................................................................................................................7-9
RF ASIC test points................................................................................................................................................7-10
Synthesizer troubleshooting...............................................................................................................................7-11
Synthesizer test points........................................................................................................................................7-12
Receiver troubleshooting....................................................................................................................................7-12
Introduction to Rx troubleshooting..............................................................................................................7-12
GSM Rx chain activation for manual measurements / GSM RSSI measurement........................................7-13
WCDMA Rx chain activation for manual measurement...............................................................................7-13
WCDMA RSSI measurement............................................................................................................................7-14
GSM receiver troubleshooting........................................................................................................................7-16
WCDMA receiver troubleshooting..................................................................................................................7-17
Receiver test points.........................................................................................................................................7-18
Transmitter troubleshooting..............................................................................................................................7-18
General instructions for Tx troubleshooting................................................................................................7-18
GSM transmitter troubleshooting..................................................................................................................7-22
WCDMA transmitter troubleshooting............................................................................................................7-23
Transmitter test points...................................................................................................................................7-23
Power amplifier (PA) and switch mode power supply (SMPS) troubleshooting............................................7-24
RF tunings.............................................................................................................................................................7-25
Introduction to RF tunings.............................................................................................................................7-25
RF autotuning..................................................................................................................................................7-25
RF manual tuning guide.................................................................................................................................7-28
Required manual tunings after component changes.............................................................................7-28
System mode independent manual tunings...........................................................................................7-29
RF channel filter calibration.................................................................................................................7-29
PA (power amplifier) detection...........................................................................................................7-29
Temperature sensor calibration .........................................................................................................7-30
GSM receiver tunings.................................................................................................................................7-30
Rx calibration (GSM)..............................................................................................................................7-30
Rx band filter response compensation (GSM)....................................................................................7-34
GSM transmitter tunings............................................................................................................................7-40
Tx IQ tuning (GSM).................................................................................................................................7-40
Tx power level tuning (GSM)................................................................................................................7-42
WCDMA receiver tunings............................................................................................................................7-46
RX calibration (WCDMA)........................................................................................................................7-46
WCDMA transmitter tunings......................................................................................................................7-49
Tx AGC & power detector (WCDMA).....................................................................................................7-49
Tx band response calibration (WCDMA)..............................................................................................7-55
Tx LO leakage (WCDMA)........................................................................................................................7-57
WLAN transmitter troubleshooting....................................................................................................................7-57
WLAN Tx tuning...............................................................................................................................................7-57
WLAN Tx tests..................................................................................................................................................7-58
List of Tables
Table 11 RF channel filter calibration tuning limits.........................................................................................7-29
Table 12 Temperature sensor calibration tuning limits..................................................................................7-30
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