Troubleshooting The Gps Bb; Troubleshooting Flowchart - Nokia NPD-4 Series Troubleshooting - Gps

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CCS Technical Documentation

Troubleshooting the GPS BB

To troubleshoot the GPS BB, put the GPS engine (GE) and cellular engine (CE) in the

proper mode by selecting the GPS Testing drop-down menu item from the "Troubleshoot-

ing" dialog box. Ensure that the necessary inputs from the CE are good (e.g., power, clock,

and so on). Next, ensure that these inputs produce the proper outputs. Due to the large

level of integration (most functionality is contained in the two ASIC chips), the diagnos-

tics that may be performed are limited.

Visually inspect the GPS circuitry to determine if the problem is physical (dislodged parts,

corrosion, poor solder joints, and so on) prior to performing any diagnostics.

Before implementing the flowchart, ensure that the CE is not in power-saving mode. This

will allow the GE to run. Turn the GPS section ON in the "GPS Receiver Control (AMS)"

tab of the GPS component in Phoenix.

Reference Table 1 for GPS Test Points assignment and Figure 10 for GPS Test

Points locations.

Issue 1 02/2003

Figure 2: GPS RF-BB ASIC Interface

Nokia Corporation

Troubleshooting — GPS

Confidential

NPD-4

1.8V from

Cellular Engine

Page 7

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