Nokia RH-34 Series Technical Documentation Manual page 52

RH-34
Troubleshooting - Baseband
Vcore at 1.5V?
Vio at 1.8V?
GPS_RF_CLK
(19.2MHz) OK?
GPS_EN_RESET is
held high?
GPS_SLEEPCLK
(32.768KHz) OK?
VRF_GPS OK?
GPS_CLK (16.368MHz) OK?
Test Mode 1 OK?
CE sending code download
signals?
SPI interface active?
RF Data and clock?
Debug RF front end
Page 52
NO
NO
NO
NO
VRF_GPS regulator
NO
enable line low?
NO
NO
NO
NO
NO
Figure 12: GPS troubleshooting flowchart
©2003 Nokia Corporation
CCS Technical Documentation
Troubleshoot CE power supply
Troubleshoot CE VCTCXO
circuit
BB ASIC being held in reset,
troubleshoot source in the CE
Troubleshoot CE sleep clock
circuit
Replace regulator
NO
(N052)
Replace TXCO or GPS RF ASIC
Replace GPS BB ASIC
Determine why CE not sending
download signals
Replace GPS BB ASIC
Replace GPS RF ASIC
Confidential Issue 1 11/2003