Operating instructions

9-8 800/900 Band Troubleshooting Charts
Measure spectrum at C911=ref(-80dBm)
Measure spectrum at
GPS_ANT (C914)
≈ref-1.3dBm
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Inspect regulator (U3700)
Inspect SiRF IC (U8000)
SiRF_LNA_EN
(R8020)=2.8v?
2.8V_GPS_LNA
(E8006) =2.8v?
No
No
Measure spectrum at
SAW filter1 (C8013)
≈ref-3.1dBm?
Measure spectrum at
LNA (C8017)
≈ref+14.9dBm?
Measure spectrum at SAW
filter2 (C8018)
≈ref+13.1dBm?
Inspect SAW Filter 1(FL8001)
Inspect LNA (U8001)
Inspect SAW Filter 2 (FL8000)
Yes
Data is updated but no
location fix
Yes
Yes
Is R3700 = 2.8v?
XTAL_IN (C8020) within
the phase noise limit?
XTAL_IN (C8020) :
16.8MHz?
Yes
Yes
No
Inspect TCXO, Y001
No
Troubleshooting Flow Chart for GPS Receiver (Sheet 3 of 3)