Nokia E62 Service Manual page 151

RM-88
RF Troubleshooting and Manual Tuning Guide
Introduction to RF troubleshooting.....................................................................................................................7-5
RF key component placement...............................................................................................................................7-5
Receiver troubleshooting......................................................................................................................................7-9
Introduction to Rx troubleshooting................................................................................................................7-9
General instructions for RX troubleshooting..................................................................................................7-9
GSM Rx chain activation for manual measurements / GSM RSSI measurement........................................7-10
Transmitter troubleshooting..............................................................................................................................7-11
General instructions for TX troubleshooting................................................................................................7-11
TX 850/900 troubleshooting..........................................................................................................................7-14
TX 1800/1900 troubleshooting......................................................................................................................7-15
Checking antenna functionality.....................................................................................................................7-15
RF tunings.............................................................................................................................................................7-17
Introduction to RF tunings.............................................................................................................................7-17
RF autotuning..................................................................................................................................................7-17
System mode independent manual tunings.....................................................................................................7-20
Rf channel filter calibration............................................................................................................................7-20
PA (power amplifier) detection.....................................................................................................................7-21
GSM receiver tunings............................................................................................................................................7-21
Rx calibration (GSM)........................................................................................................................................7-21
Rx band filter response compensation (GSM)...............................................................................................7-25
GSM transmitter tunings......................................................................................................................................7-30
Tx IQ tuning (GSM)...........................................................................................................................................7-30
Tx power level tuning (GSM)..........................................................................................................................7-32
List of Tables
Table 12 Rf channel filter calibration tuning limits..........................................................................................7-20
Table 13 RF tuning limits in Rx calibration........................................................................................................7-24
List of Figures
Figure 42 RM-88 RF components..........................................................................................................................7-6
Figure 43 RM-88 BT component placement.........................................................................................................7-7
Figure 44 RM-88 component placement (top).....................................................................................................7-8
Figure 45 RM-88 component placement (bottom).............................................................................................7-8
Figure 46 RF Controls window............................................................................................................................7-10
Figure 47 RSSI Reading window.........................................................................................................................7-11
Figure 48 RF Controls window............................................................................................................................7-13
Figure 49 Main antenna.......................................................................................................................................7-16
Figure 50 Feed and GND spots of the main antenna........................................................................................7-16
Figure 51 Rf channel filter calibration typical values.......................................................................................7-20
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