Operating instructions

800/900 Band Troubleshooting Charts 9-7
2. R3704: 1.875V
E8004: 0V
R3700: 2.775V
1. VDDK : C8022 : 1.4 to 1.6V
VDD_BB : C8000 : 2.7 to 3.0V
VCC_IO : C8005 : 2.7 to 3.0V
VCC_RF : C8003 : 2.7 to 3.0V
VDD_RTC : C8031 : 1.1 to 1.3V
TP_CLK_ACQ :
16.369MHz?
GPS not working.
No data from SiRF IC
Proper voltage?
1
XTAL_IN (C8020) :
200-1200mV?
XTAL_IN (C8020) :
16.8MHz?
Activity on
TP_GPS_RX?
Yes
E3700, E3702, E3704 :
3.6V?
No
Inspect U3020
Yes
No
Inspect GPS regulator
Yes
Inspect TCXO, Y001
Yes
No
No
Inspect SiRF, U8000
Yes
Yes
No
Inspect OMAP, U1000 &
level shifter U 1005
No
SiRF IC flashed?
Proceed to SiRF IC flashing.
No
SiRF in external boot
mode? R8010 toggle
LOW, 0V ?
Yes
Configure SiRF IC into external BOOT
MODE & re-run the test
No
Proper regulator control
voltages?
No
Yes
2
Yes
Troubleshooting Flow Chart for GPS Receiver (Sheet 2 of 3)