User Guide

Nokia Customer Care Troubleshooting - Baseband
6015/6015i/6016i/6019i (RH-55), 6012 (RM-20)
Issue 1 - Revision 002 09/2004 ©2004 Nokia Corporation Company Confidential Page 45
GPS
Is VCORE at 1.5V?
Troubleshoot CE
power supply
Is VIO at 1.8V?
Troubleshoot CE
VCTCXO circuit
NO
NO
YES
YES
GPS faults
GPS_RF_CLK
(19.2MHz) OK?
YES
GPS_EN_RESET held
high?
If the BB ASIC is being
held in reset,
troubleshoot the
source in the CE
YES
GPS_SLEEPCLK
(32.768KHz) OK?
NO
NO
YES
VRF_GPS OK?
YES
GPS_CLK (16.368MHz)
OK?
YES
Test Mode 1 OK?
YES
CE sending code
download signals?
YES
SPI interface active?
YES
RF data and clock?
YES
Debug RF front end
Troubleshoot CE sleep
clock circuit
NO
VRF_GPS regulator
enable line low?
NO
Replace regulator
N052
NO
Replace TCXO or GPS
RF ASIC
NO
YES
Replace GPS BB ASIC
NO
Determine why CE not
sending download
signals
NO
Replace GPS BB ASIC
NO
Replace GPS RF ASIC
NO