Gps; How Gps Works; Gps Troubleshooting - Nokia 3155i Troubleshooting Manual

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Nokia Customer Care

GPS

This is for emergency 911 GPS service only. When you dial 911, the GPS turns on by

using Vcore_Lin and VIO from UEMEK. GPS communicates with the D2800 using the

UART interface. This turns on the BB chip and the RF chip. They synchronize with the

mobile terminal using the 19.2Mhz clock. The mobile terminal locates the closest

satellite and downloads the location coordinates to send them to the Emergency desk.

When troubleshooting GPS, make these common checks (see

• Check the Power Vcore and VIO

• Check that GPS_RF_CLk = 19.2Mhz

• Check the GPS_EN_Reset

• Check that Sleep_CLK = 32.768kHz

• Check that VRF_GPS = 2.78

• Check that the GPS clock = 16.384Mhz

ISSUE 1 07/2005

Figure 25: GPS Block Diagram

3155/3155i (RM-41), 3152 (RM-61)

Baseband Description and Troubleshooting

Figure 26

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