Nokia NPD-4 Series Troubleshooting - Gps page 8

NPD-4
Troubleshooting — GPS
Vcore at 1.5V?
at CO57
(See Figure 10)
Yes
VIO at 1.8V?
(@ C018)
at open pad
(See Figure 10)
Yes
GPS_RF_CLK
(19.2MHz) OK?
(J062)
Yes
GPS_EN_RESET is
held high?
(J061)
Yes
GPS_SLEEPCLK
(32.768KHz) OK?
(J063)
Yes
VRF_GPS OK?
Yes
Page 8
Troubleshoot CE
power supply
No
Troubleshoot CE
No
VCTCXO circuit
BB ASIC being held in
reset, troubleshoot
No
source in CE
Troubleshoot CE
No
sleep clock circuit
VRF_GPS regulator
No
enable line low?
Yes
Nokia Corporation
CCS Technical Documentation
No
Confidential
Replace regulator
N052
Issue 1 02/2003