Nokia 6680 RM-36 Service Manual page 191

RM-36
RF Troubleshooting and Manual Tuning Guide
Introduction to RF troubleshooting.........................................................................................................................................7-5
RF key component placement....................................................................................................................................................7-5
Troubleshooting test point locations......................................................................................................................................7-7
Receiver troubleshooting............................................................................................................................................................7-9
Introduction to Rx troubleshooting...................................................................................................................................7-9
GSM Rx chain activation for manual measurements / GSM RSSI measurement................................................7-10
WCDMA Rx chain activation for manual measurement.............................................................................................7-10
WCDMA RSSI measurement.................................................................................................................................................7-11
Transmitter troubleshooting...................................................................................................................................................7-12
General instructions for Tx troubleshooting.................................................................................................................7-12
Checking antennae functionality......................................................................................................................................7-15
RF tunings......................................................................................................................................................................................7-16
Introduction to RF tunings.................................................................................................................................................7-16
RF autotuning.........................................................................................................................................................................7-17
RF autotuning with CMU200.........................................................................................................................................7-17
RF manual tuning guide......................................................................................................................................................7-23
Required manual tunings after component changes..........................................................................................7-23
System mode independent manual tunings..........................................................................................................7-24
GSM receiver tunings......................................................................................................................................................7-26
GSM transmitter tunings................................................................................................................................................7-39
WCDMA receiver tunings................................................................................................................................................7-45
WCDMA transmitter tunings.........................................................................................................................................7-49
List of Tables
Table 11 RF channel filter calibration tuning limits..........................................................................................................7-24
Table 12 Temperature sensor calibration tuning limits..................................................................................................7-26
Table 13 RF tuning limits in Rx calibration...........................................................................................................................7-28
Table 14 RSSI level values..........................................................................................................................................................7-38
List of Figures
Figure 64 RF key component placement.................................................................................................................................7-6
Figure 65 Test point locations for spectrum analyzer.........................................................................................................7-7
Figure 66 Test points for oscilloscope - bottom....................................................................................................................7-8
Figure 67 Test points for oscilloscope - top............................................................................................................................7-9
Figure 68 RSSI Reading window..............................................................................................................................................7-10
Figure 69 Activating Rx Control window in Phoenix.........................................................................................................7-11
Figure 70 Rx Control window...................................................................................................................................................7-11
Figure 71 RF Controls window..................................................................................................................................................7-14
Figure 72 Tx Control window....................................................................................................................................................7-15
Figure 73 Feed and GND spots of the main antenna.........................................................................................................7-16
Figure 74 BT antenna..................................................................................................................................................................7-16
Figure 75 RF channel filter calibration typical values.......................................................................................................7-25
Figure 76 High burst measurement........................................................................................................................................7-52
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