Quick Test Window - Nokia RM-235 Service Manual

Context
Use the following to test GPS using Phoenix.
Steps
1. Place phone to Flash Adaptor.
2. Start Phoenix service software.
3. From the File menu, select Scan Product and check that the correct product version is displayed.
4. From the Testing menu, select GPS Control. This opens up
figure below, and enables the GPS.
Select Idle to confirm the GPS is enabled and is in idle mode; at this point all clocks should be present,
GPS_En_Reset & SleepX should be high, and Vdd_Dig, Vcc_TCXO & Vcc_PLL/VCO will be present.
Receiver On turns on all RF sections of the ASIC and so all LDOs will be on.

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 pogo pins and the GPS ASIC. It also contains a receive button.
Before this test is performed a known good RM-235 unit should be tested in order to calibrate the setup. The
signal level of the Signal Generator should be adjusted so a reading of SNR 40 dB is achieved with the reference
unit. A good starting point is to set up the signal generator to -45dBm.
These checks are part of
Page 3 –46
Figure 19 GPS Control dialogue box
GPS failure troubleshooting (page
COMPANY CONFIDENTIAL
Copyright © 2008 Nokia. All rights reserved.
GPS Control dialogue box, as shown in the
3–48).
RM-235
BB troubleshooting
Issue 1