User Guide

Nokia Customer Care Baseband Description and Troubleshooting
2115i/2116/2116i (RH-66)
Issue 1 03/2005 ©2005 Nokia Corporation Company Confidential Page 29
GPS Module
The GPS circuitry utilizes RF signals from satellites stationed in geosynchronous orbit to
determine longitude and latitude of the mobile terminal. 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. (See Figure 21 on page 30.)
Use the following steps for basic GPS BB troubleshooting:
1. Always perform a visual inspection on the GPS circuitry to see if the problem is
physical (dislodged parts, corrosion, poor solder joints, etc.) before performing a
diagnostic test.
2. Put the GE and CE in the proper mode.
3. Check to make sure that necessary inputs from the CE are good (power, clock,
etc.).
4. 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 diagnostics you can perform are limited.