Gps Rf Quick Fault-Finding Chart - Nokia NPD-4 Series Troubleshooting - Gps

CCS Technical Documentation

GPS RF Quick Fault-finding Chart

Apply 1575.520152 MHz @ -110 dBm
CW signal to external GPS RF connector/
switch and run Troubleshooting/GPS
Testing/GPS Quick Test/Galvanic
NOT OK
Apply 1575.520152 MHz @ -100 dBm
CW signal to external GPS RF connector/
switch and run Troubleshooting/GPS
Testing/GPS Receiver Control (AMS)/
Receiver ON
Check the 19.2 MHz GPS_RFCLK signal
at J062
OK
Check the 16.368 MHz GPS_CLK signal
at J009
OK
Check the 196.416 MHz LO/8 at J003 and
sampled signals GPS_B0, GPS_B1 ,
GPS_B3, GPS_B2 at JJ011, J012, J013
and J014
OK
Check signal level at X001 output
OK
Check signal level at Z001 output (C005)
OK
Check signal level at V001 output (C009)
OK
Check signal level at N001 input (C014)
Figure 9: GPS RF Fault-finding chart (Quick reference)
Issue 1 02/2003
Start CDMA troubleshooting,
VCTCXO etc.
Not OK
Measure VRF_GPS at C015 & C024
Not OK
OK
Replace TCXO B002
Measure VIO at C018
Not OK
OK
Replace GPS RF ASIC N001
Replace switch X001
Not OK
Replace filter Z001
Not OK
Replace transistor V001
Not OK
Replace filter Z002
Not OK
Nokia Corporation
Troubleshooting — GPS
Replace regulator N052
Not OK
Start CDMA BB troubleshooting,
UEM etc.
Not OK
Confidential
NPD-4
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