Gps Troubleshooting; Introduction To Gps Troubleshooting; Gps Settings For Phoenix; Quick Test Window - Nokia 500 Service Manual

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BB Troubleshooting and Manual Tuning Guide

GPS troubleshooting

Introduction to GPS troubleshooting

GPSCost4.1D is a single chip GPS receiver, comprising both RF and BB blocks integrated in a single digital die.
GPSCost4.1D is connected to RAPU ASIC via I2C_1 and some GENIOs. GPSCost4.1 D operates in Multi-master
mode and the REF clock is requested via AGPS_CLK_REQ signal connected to RAPU genio46. REFOUT_EXT2 single
ended 38.4 MHz analog clock from Linko RF is provided to GPSCost4.1D.
The GPS components are located on the bottom side of the PWB. Satellite signals are picked up by the
Bluetooth/WLAN/GPS antenna. The signal is then routed through a diplexer before being processed by the
GPS5350 receiver ASIC.
System module description .
For GPS engine location, see the figure

GPS settings for Phoenix

Quick Test window

This test will perform 3 tests in one: Self test, Oscillator Test and CW Test and will provide a Pass/Fail Response
for each. The HW Self Test confirms basic communication with the GPS ASIC. The oscillator test confirms the
frequency accuracy of the GPS TCXO against the Ref_Clk. The CW Test confirms end-to-end connectivity
between the GPS antenna and the GPS ASIC. It also contains a receive button.
Before this test is performed a known good phone should be tested in order to calibrate the setup. The signal
level of the Signal Generator should be adjusted so a reading of SNR 35 dB is achieved with the reference
unit. A good starting point is to set up the signal generator to -50 dBm.
GPS failure troubleshooting .
These checks are part of
Figure 13 GPS Quick Test window
Issue 1 COMPANY CONFIDENTIAL Page 3 – 49
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