Nokia 6585 Service Manual
RH-34
Troubleshooting - Baseband
CCS Technical Documentation
Page 52
©
2003 Nokia Corporation Confidential
Issue 1 11/2003
Figure 12: GPS troubleshooting flowchart
Vcore at 1.5V?
Troubleshoot CE power supply
Vio at 1.8V?
Troubleshoot CE VCTCXO
circuit
GPS_RF_CLK
(19.2MHz) OK?
BB ASIC being held in reset,
troubleshoot source in the CE
GPS_EN_RESET is
held high?
GPS_SLEEPCLK
(32.768KHz) OK?
Troubleshoot CE sleep clock
circuit
VRF_GPS OK?
VRF_GPS regulator
enable line low?
Replace regulator
(N052)
GPS_CLK (16.368MHz) OK?
Replace TXCO or GPS RF ASIC
Test Mode 1 OK?
Replace GPS BB ASIC
CE sending code download
signals?
Determine why CE not sending
download signals
SPI interface active?
Replace GPS BB ASIC
Replace GPS RF ASIC
RF Data and clock?
Debug RF front end
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO