Table of Contents
General instructions for cellular RF troubleshooting......................................................................................... 4–5
Cellular RF key components.................................................................................................................................. 4–6
Cellular RF main troubleshooting ........................................................................................................................ 4–7
Cellular RF main troubleshooting................................................................................................................... 4–7
Self test troubleshooting.............................................................................................................................. 4–10
Troubleshooting with RF Self tests......................................................................................................... 4–10
RF-BB interface self test troubleshooting.............................................................................................. 4–11
RF supply self test troubleshooting........................................................................................................ 4–12
VBAT level.................................................................................................................................................. 4–13
VXO level.................................................................................................................................................... 4–14
VIO level..................................................................................................................................................... 4–15
VREF level .................................................................................................................................................. 4–15
VHIA (Vhi) level ......................................................................................................................................... 4–16
VDCDCA (Vlow) level ................................................................................................................................. 4–16
VPA level.................................................................................................................................................... 4–17
RF tuning and testing ........................................................................................................................................ 4–17
RF auto tuning and testing with Nokia Care Suite..................................................................................... 4–17
RF auto tuning procedure ............................................................................................................................ 4–18
Automatic RF testing with Nokia Care Suite............................................................................................... 4–22
Troubleshooting with Testing And Tuning Tool ........................................................................................ 4–23
Manual transmitter (TX) testing with Phoenix........................................................................................... 4–26
General instructions for transmitter (TX) activation ............................................................................ 4–26
GSM transmitter activation...................................................................................................................... 4–26
WCDMA transmitter activation................................................................................................................ 4–29
Manual receiver (RX) testing with Phoenix ................................................................................................ 4–30
General instructions for manual receiver testing................................................................................. 4–30
GSM RX chain activation for manual measurements/GSM RSSI measurement .................................. 4–31
WCDMA RX chain activation for manual measurement........................................................................ 4–31
WCDMA RSSI measurement ..................................................................................................................... 4–32
Antenna............................................................................................................................................................... 4–33
Antenna overview ......................................................................................................................................... 4–33
Antenna troubleshooting............................................................................................................................. 4–35
List of Figures
Figure 22 Linko shields......................................................................................................................................... 4–7
Figure 23 GSM/WCDMA antenna connection pads........................................................................................... 4–35
Figure 24 Pogo pins for GSM/WCDMA antenna................................................................................................ 4–35
Figure 25 Cellular antenna fail situation.......................................................................................................... 4–36
Figure 26 C-clip for WLAN/BT/GPS antenna ..................................................................................................... 4–36
Figure 27 C-clip for FM TX antenna ................................................................................................................... 4–37
Figure 28 GND pogo pin for FM TX antenna..................................................................................................... 4–37
RM-596
Cellular RF troubleshooting
Issue 2 COMPANY CONFIDENTIAL Page 4 – 3
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