Nokia 6670 Manuale Di Servizio

Nokia Customer Care

6(b) - RF Troubleshooting

                                Company Confidential                   RH-51/52, RH-67/68

Issue 3 09/2004

      ©

 2004 Nokia Corporation.

Page 3

RF key component placement...............................................................................................................9
Receiver troubleshooting......................................................................................................................10

General description ............................................................................................................................10
General instructions for RX troubleshooting ..............................................................................12

Measuring RX I/Q signals using RSSI..........................................................................................12
Measuring RX performance using SNR measurement ...........................................................14
Measuring the RX module manually using oscilloscope and spectrum analyzer...........15
GSM 900/850.....................................................................................................................................15
GSM1800 ............................................................................................................................................17
GSM1900 ............................................................................................................................................19
Measurement points in the receiver ...........................................................................................21

RX calibration ....................................................................................................................................23
RX band filter response compensation.......................................................................................25

General description ............................................................................................................................27
Preparation for troubleshooting .....................................................................................................28

Fault-finding chart: TX-BB interface and control signals.....................................................30
Fault-finding chart: RF side of transmitter...............................................................................31

TX IQ tuning  .........................................................................................................................................34
TX power level tuning ........................................................................................................................39

General description ............................................................................................................................43
Assumption ...........................................................................................................................................45
Preparation for troubleshooting .....................................................................................................46
Measuring the synthesizer manually using spectrum analyzer  ............................................47
Troubelshooting chart for synthesizer ..........................................................................................47

Bluetooth component placement  ..................................................................................................49
Bluetooth settings for Phoenix .......................................................................................................49
Bluetooth troubleshooting diagram ..............................................................................................52