Nokia N900 Service Manual page 125

RX-51
Cellular RF troubleshooting
General RF troubleshooting ..................................................................................................................................4-5
Introduction to RF troubleshooting ................................................................................................................4-5
Cellular RF test points .......................................................................................................................................4-5
Auto tuning .............................................................................................................................................................4-6
Introduction to RF tunings ...............................................................................................................................4-6
Auto tuning........................................................................................................................................................4-6
Self test troubleshooting.......................................................................................................................................4-7
Self test troubleshooting..................................................................................................................................4-7
Receiver troubleshooting ......................................................................................................................................4-9
Introduction to receiver (RX) troubleshooting...............................................................................................4-9
GSM RX chain activation for manual measurements/GSM RSSI measurement ...........................................4-9
GSM receiver troubleshooting flowchart
WCDMA RX chain activation for manual measurement
WCDMA RSSI measurement
WCDMA receiver troubleshooting
Transmitter troubleshooting
General instructions for transmitter (TX)
GSM transmitter troubleshooting.................................................................................................................
WCDMA transmitter troubleshooting
Antenna ................................................................................................................................................................
Antenna troubleshooting
List of Figures
Figure 24 Cellular RF test points 1 ........................................................................................................................4-5
Figure 25 Cellular RF test points 2 ........................................................................................................................4-6
Figure 26 Phoenix GSM RSSI reading window .....................................................................................................4-9
Figure 27 Phoenix WCDMA RX Control window
Figure 28 WCDMA RX generator settings
Figure 29 Phoenix WCDMA RX power measurement window
Figure 30 Phoenix GSM RF controls
Figure 31 Antenna contacts
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