Nokia NPD-4 Series Troubleshooting - Gps
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Nokia NPD-4 Series Troubleshooting - Gps

Nokia NPD-4 Series Troubleshooting - Gps

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CCS Technical Documentation
NPD-4 Series Transceivers
Troubleshooting — GPS
Nokia Corporation
Issue 1 02/2003
Confidential

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  • Page 1 CCS Technical Documentation NPD-4 Series Transceivers Troubleshooting — GPS Nokia Corporation Issue 1 02/2003 Confidential...
  • Page 2 NPD-4 Troubleshooting — GPS CCS Technical Documentation Nokia Corporation Page 2 Confidential Issue 1 02/2003...

  • Page 3: Table Of Contents

    GPS RF Quick Fault-finding Chart ................15 GPS RF Circuitry and Component Placement ............16 GPS RF General Checking ..................18 GPS Reference Clock Checking ................21 GPS RF and GPS BB Interface Checking ..............23 GPS RX Chain Checking ...................24 Nokia Corporation Issue 1 02/2003 Confidential Page 3...
  • Page 4 NPD-4 Troubleshooting — GPS CCS Technical Documentation Nokia Corporation Page 4 Confidential Issue 1 02/2003...

  • Page 5: Troubleshooting - Global Positioning System (Gps) Engine

    VLNA is optional (Not Populated) 1.8V GPS BB/Cellular I/F System Clock Secondary UART 19.2MHz (CDMA) (Diagnostic) Cellular Engine 32768Hz crystal Vcore System Clock SLEEPX Cellular SLEEP CLK Figure 1: GPS Block Diagram Nokia Corporation Issue 1 02/2003 Confidential Page 5...

  • Page 6: Acronyms And Abbreviations

    Federal Communications Commission CDMA Code Division Multiple Access C/No Carrier to Noise ratio [dB-Hz] Navstar Global Positioning System Hardware Integrated Circuit LPRF Low Power RF Noise Figure Printed Wiring Board Radio Frequency Nokia Corporation Page 6 Confidential Issue 1 02/2003...

  • Page 7: Troubleshooting The Gps Bb

    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. Nokia Corporation Issue 1 02/2003 Confidential Page 7...
  • Page 8 BB ASIC being held in held high? reset, troubleshoot (J061) source in CE GPS_SLEEPCLK Troubleshoot CE (32.768KHz) OK? sleep clock circuit (J063) VRF_GPS regulator Replace regulator VRF_GPS OK? enable line low? N052 Nokia Corporation Page 8 Confidential Issue 1 02/2003...
  • Page 9 Phoenix) Determine why CE not CE sending code sending download download signals? signals Replace GPS BB SPI interface active? ASIC Replace GPS RF RF data and clock? ASIC Debug RF front end Nokia Corporation Issue 1 02/2003 Confidential Page 9...

  • Page 10: Flowchart Notes

    The proper GPS_RF_CLK is a 19.2 MHz, approximately 800mV peak-to-peak sine wave (see Figure 3). Figure 3: 19.2MHz System Clock The GPS_CLK should be a 16.3MHz, 1.8V peak-to-peak square wave (see Figure 4). Figure 4: GPS_CLK Nokia Corporation Page 10 Confidential Issue 1 02/2003...
  • Page 11 (e.g., between ON and OFF mode in the “GPS Receiver Control” tab of the GPS component in Phoenix). See Figure 6. Nokia Corporation Issue 1 02/2003 Confidential...
  • Page 12 B3) and GPS_CLK. The GPS_CLK has been previously tested (see the flowchart). The four-data lines should show continuous activity almost immediately after power has been applied to the phone (see Figure 7). Figure 7: RF Data and Clock Nokia Corporation Page 12 Confidential Issue 1 02/2003...

  • Page 13: Troubleshooting The Gps Rf

    2 GPS reference clock checking 3 GPS RF and GPS BB interface checking 4 GPS RX chain checking The fastest way to troubleshoot GPS RF is to follow the GPS RF Fault-finding chart Quick Nokia Corporation Issue 1 02/2003 Confidential Page 13...

  • Page 14: Test Equipment

    ÷ 2 GPS Clock ÷ 8 LO/8 Test Point LO/8 Test 196.416 MHz ÷12 fcomp=16.368MHz Ph ase DATA Pr ogramming CLOCK 16.368 MHz Oscillator Interface ENABLE TCXO Figure 8: GPS RF Functional Diagram Nokia Corporation Page 14 Confidential Issue 1 02/2003...

  • Page 15: Gps Rf Quick Fault-Finding Chart

    Check signal level at V001 output (C009) Replace transistor V001 Not OK Check signal level at N001 input (C014) Replace filter Z002 Not OK Figure 9: GPS RF Fault-finding chart (Quick reference) Nokia Corporation Issue 1 02/2003 Confidential Page 15...

  • Page 16: Gps Rf Circuitry And Component Placement

    GPS_B2 J068 J052 GPS_I2C_CLOCK J051 GPS_I2C_DATA J065 VDD_IO_GPS J066 GPS_U2TX J067 GPS_U2RX J064 GPS_PA_EN J063 GPS_SLEEPCLK J060 GPS_SLEEPX J056 GPS_U1_DATA_RDY-TIMESTAMP J058 GPS_U1_RX J057 GPS_U1_TX J055 GPS_INT_U1_CLK J061 GPS_EN_RESET J062 GPS_RFCLK (19.2 MHZ) Nokia Corporation Page 16 Confidential Issue 1 02/2003...
  • Page 17 NPD-4 CCS Technical Documentation Troubleshooting — GPS LNA VCE VRF_GPS J010 VCORE Figure 10: GPS Component Placement (PWB Bottom Side) Nokia Corporation Issue 1 02/2003 Confidential Page 17...

  • Page 18: Gps Rf General Checking

    2 Connect CW signal as stated above via GPS RF connector 3 Connect DAU-9T cable to Tomahawk connector 4 On Phoenix, choose connection as FBUS and select File/Scan Product 5 Select Troubleshooting/GPS Testing/GPS Quick Test/Test Mode Galvanic in Phoenix Nokia Corporation Page 18 Confidential Issue 1 02/2003...
  • Page 19 (or vary +/- 10 dB compared to galvanic SNR result) 9 Check Bin value is between 2448 +/- 105 10 If the test didn’t pass, start to troubleshoot by selecting Troubleshooting/GPS Nokia Corporation Issue 1 02/2003 Confidential Page 19...
  • Page 20 DC voltages VRF_GPS at C024 and C015, LNA VCE at L006 and VIO at C018 should be as presented in the following picture: Figure 12: DC level of LNA Collector Emitter Voltage Vce Nokia Corporation Page 20 Confidential Issue 1 02/2003...

  • Page 21: Gps Reference Clock Checking

    Figure 14: DC level of VIO GPS Reference Clock Checking 1 Cycle power 2 Choose connection as FBUS and select File/Scan Product 3 Select Troubleshoot/GPS Testing/GPS Receiver Control (AMS) / Receiver On in Phoenix Nokia Corporation Issue 1 02/2003 Confidential Page 21...
  • Page 22 8 GPS 16.368 MHz system clock for GPS RF ASIC N001 should be within +/- 256 Hz limits if tested with MCU/GPS Control/GPS Quick Test. The 16.368 MHz signal looks like the following picture: Figure 16: GPS 16.368 MHz reference clock from TCXO before C029 Nokia Corporation Page 22 Confidential Issue 1 02/2003...

  • Page 23: Gps Rf And Gps Bb Interface Checking

    1 Next connect oscilloscope 10:1 probe into GPS_CLK output of the N001 between pin D7 and J010 2 GPS 16.368 MHz system clock to GPS BB should look like the following picture: Figure 18: GPS 16.368 MHz reference clock to GPS BB Nokia Corporation Issue 1 02/2003 Confidential Page 23...

  • Page 24: Gps Rx Chain Checking

    2 Connect spectrum analyzer through active probe with attenuator into filter Z001 output 3 If connector/switch X001 and filter Z001 are OK, the signal level should be simi- lar to the following picture: Nokia Corporation Page 24 Confidential Issue 1 02/2003...
  • Page 25 6 Next connect spectrum analyzer through active probe with attenuator into filter Z002 Output 7 If connector/switch X001, filter Z001, LNA V001 and filter Z002 are OK , the sig- nal level should be similar to the following picture: Nokia Corporation Issue 1 02/2003 Confidential Page 25...
  • Page 26 NPD-4 Troubleshooting — GPS CCS Technical Documentation Figure 22: Signal level at Z002 output Figure 23: Signal level at IF output @-100dBm Input Nokia Corporation Page 26 Confidential Issue 1 02/2003...
  • Page 27 NPD-4 CCS Technical Documentation Troubleshooting — GPS Figure 24: Signal level at IF output @-110dBm Input Figure 25: Signal level at IF output @-120dBm Input Nokia Corporation Issue 1 02/2003 Confidential Page 27...
  • Page 28 NPD-4 Troubleshooting — GPS CCS Technical Documentation Nokia Corporation Page 28 Confidential Issue 1 02/2003...

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