Nokia RM-11 Series Troubleshooting Manual page 58

RM-11
Troubleshooting - Baseband
GPS Module
The GPS circuitry utilizes RF signals from satellites stationed in geosynchronous orbit to
determine longitude and latitude of the handset. The GPS circuitry is completely separate
of the CE circuitry and is located almost exclusively on the secondary side of the PWB
underneath the display module.
The basic GPS BB troubleshooting method is to put the GE and CE in the proper mode,
then check to make sure that necessary inputs from the CE are good (power, clock, etc.).
Ensure that these inputs produce the proper outputs. Because of the large level of
integration (most functionality is contained in the two ASIC chips), the amount of
diagnostics one is able to do is limited.
Prior to performing diagnostics, perform a visual inspection on the GPS circuitry to see if
the problem is physical (dislodged parts, corrosion, poor solder joints, etc.)
©2005 Nokia Corporation
Page 58
Figure 25: GPS block diagram
Confidential
CC Technical Documentation
Issue 2 09/2005