CC Technical Documentation RM-11 Series Transceivers Troubleshooting - GPS Issue 1 02/2004 Confidential ©2004 Nokia Corporation
RM-11 Troubleshooting - GPS CC Technical Documentation Contents Page Troubleshooting - Global Positioning System (GPS) Engine........................................ 3 GPS General Block Diagram .......................................................................................3 GPS RF Schematic ......................................................................................................3 GPS Testing ............................................................................................
RM-11 Troubleshooting - GPS CC Technical Documentation Troubleshooting - Global Positioning System (GPS) Engine The RM-11 handset supports 800 AMPS and 800 CDMA / 1900 CDMA + GPS with IS 2000 capability. The RM-11 engine supports CDMA and GPS functionality for Enhanced 911 (E911) services. GPS circuitry utilizes RF signals from satellites stationed in geosynchronous orbit to determine the latitude and longitude of the handset.
RM-11 Troubleshooting - GPS CC Technical Documentation GPS Testing 1. Set Local Mode. Figure 3: Phone Control dialog box 2. Inject -110dBm tone @ 1575.52MHz at GPS connector (X001) with a signal generator or call box. Signal Generator RF OUT Figure 4: GPS connector (X001) 3. Open the BB/Hwd menu and select GPS Control. 4. Click the Execute button on the GPS Control dialog box to run a GPS quick test.
RM-11 Troubleshooting - GPS CC Technical Documentation 5. Analyze the results of the GPS test in the Test Steps area. Figure 5: GPS Control dialog box 6. Self-Test Failure: • Repeat Steps 1-5 for first failure. If the test still fails, continue. • Inspect all GPS circuit elements around D051. • If pass visual inspection, then replace D051.
RM-11 Troubleshooting - GPS CC Technical Documentation 7. Oscillator Failure: • Inspect all GPS circuit elements around D051. • If pass visual inspection, then replace B002. D051 B002 Figure 6: Component layout - top layer 8. CW Test Failure (see Figure 7): Page 6 • Check that signal generator is on and sourcing a signal to the GPS RF input port (X001). • Inspect all GPS RF circuit elements. • Inspect all GPS circuit elements around D051.
RM-11 Troubleshooting - GPS CC Technical Documentation INSPECT Figure 7: Inspection areas for CW test failure Issue 1 02/2004 ©2004 Nokia Corporation Confidential Page 7
RM-11 Troubleshooting - GPS CC Technical Documentation GPS RF Probing Setup 1. Turn on the GPS Receiver 2. Inject -25dBm tone @ 1575.52MHz at GPS Connector (X001) with signal generator or Call Box.
RM-11 Troubleshooting - GPS CC Technical Documentation 3. Measure probe points with either a FET probe and a spectrum analyzer set at center frequency 1575.25MHz, Span = 500kHz, or a voltmeter as specified. See Table 1 for measurement information that correspond to the test points in Figure 9. 2 - Probe C014 3 - Probe C015 1 - Probe one of the two exposed pads that lead into the Z001 4 - Probe C029 Figure 9: GPS RF probing measurements Table 1 defines the test points shown in Figure 9.
RM-11 Troubleshooting - GPS Page 10 CC Technical Documentation ©2004 Nokia Corporation Confidential Issue 1 02/2004
