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1255 Technical Training RF Troubleshooting Presentation

1255 Technical Training RF Troubleshooting Presentation. NMP -CDMA, San Diego Jan , 200 6. Disclaimer. Materials current at time of publish and based upon most current R&D Documentation. Please refer to the latest product TB to determine further handset hardware variations if any.

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1255 Technical Training RF Troubleshooting Presentation

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  1. 1255 Technical TrainingRF Troubleshooting Presentation NMP-CDMA, San Diego Jan, 2006 CompanyConfidential

  2. Disclaimer Materials current at time of publish and based upon most current R&D Documentation. Please refer to the latest product TB to determine further handset hardware variations if any. CompanyConfidential

  3. Introduction The mobile terminal uses a QualcommMSM6000 baseband with a CDMA single mode engine (Cellular/ 800) consisting of two primary ASICs: • RFT6122 RF transmitter IC • RFR6122 RF receiver IC CompanyConfidential

  4. PWB Bottom Side MSM 6000 Flash IC RF receiver RX saw filter 19.2MHz TCXO cell duplexer RF transmitter power amplifier TX saw filter Power management IC CompanyConfidential

  5. PWB Top Side RF connector CompanyConfidential

  6. TX Troubleshooting CompanyConfidential

  7. Tx System Block Diagram CompanyConfidential

  8. Tx RF Parts Diagram TX Saw filter Power Amplifier TX IC Cell Duplexer CompanyConfidential

  9. FTM Setup for TX Troubleshooting Put the PWB on the module jig. Use the following steps to configure FTM for RF troubleshooting. • 1. Connect RF test connector to a spectrum. • 2. Set SW1 to “FTM mode” in Module Jig. • 3. Connect the mobile terminal to a PC via • the Module Jig, and connect a power • supply. • 4. Open CCS RF Tools software. • 5. The FTM dialog box appears. • 6. “Select COM port” to appropriate one. • 7. Set “Connect Phone”. • 8. Set “Set FTM”. • 9. Set “Set Band” to “CDMA800”. • 10. Set “Set Channel “to Channel “384”. • 11. Set “Set PA Range R1” to “on” • 12. Set TX waveform to “CDMA” • 13. Set “TX on/off” to “on”. • 14. Set “TX AGC” to “120”. CompanyConfidential

  10. Cell Tx Check from RF connector Use the following values to check the CDMA Cell Tx functionality from IQ to RF output. 1. Start FTM in Local Mode with only the Tx path turned on and “Set AGC” to “100”. 2. Transmitter output power at the RF connector to be approximately equal 24dBm/1.23MHz CDMA signal of 836.52MHz . RF Connector • FSQ26 signal analyzer settings • MEAS->CHAN PWR ACP->CP/ACP STANDARD->CDMA IS95A REV • FREQ->836.52MHZ CompanyConfidential

  11. Tx DC Probe Points 6 5 3 2 1 4 7 8 Table 1 CompanyConfidential

  12. Tx DC Probe Points 5 6 7 8 1 4 3 2 Table 2 CompanyConfidential

  13. Tx RF Probe Points Tx RF Probe Points 4 1 2 3 Table 3 5 CompanyConfidential

  14. Tx path Faults Measure DC test points at Table 1 and Table 2. Is it OK? NO Check PM6610, MSM6000 Reflow PM6610 or MSM6000 NO YES Measure Tx RF test points 5 at Table 3. Is it OK Reflow R903, C911 NO YES Measure Tx RF test points 1 at Table 3. Is it OK Change RFT6122 NO YES Measure Tx RF test points 2 at Table 3. Is it OK Reflow C920, FL600, C619, U7 NO YES Measure Tx RF test points 3 at Table 3. Is it OK Change U7 NO Reflow U7 NO YES Measure Tx RF test points 4 at Table 3. Is it OK Reflow F600, S600 NO YES If RF Antenna feed point pad obstructed , clean the pad. Connect System Simulator to MS antenna. Is it OK Check Antenna Module NO Tx path troubleshooting CompanyConfidential

  15. Rx Troubleshooting CompanyConfidential

  16. Rx System Block Diagram The RFR6122 IC provides the Zero-IF receiver signal path for Cellular-CDMA reception. For this chipset, Cellular-CDMA refers to band classes 0 and 3 as defined by the cdma2000 standard, with mobile station receivers operating between 832 and 894 MHz. The Rx signal path includes the LNA, quadrature downconversion, and baseband functions. The Cellular-CDMA receive signal is routed from the antenna to the RFR6122 IC via the duplexer. The analog baseband outputs interface with one of Qualcomm’s Mobile Station MSM6000 devices that also provide status and control signaling. Integrated RX LO circuits, ideally supplemented by the RFT6122 transmitter IC, provide frequency plan flexibility and further reduce PCB parts count. CompanyConfidential

  17. FTM setup for RX troubleshooting Put the PWB on the module jig. Use the following steps to configure FTM for RF troubleshooting. • Connect RF test connector to a spectrum. • Set SW1 to “FTM mode” in Module Jig. • Connect the mobile terminal to a PC via the Module Jig, and connect a power supply. • Open CCS RF Tools software. • TheFTMdialog box appears. • “Select COM port” to appropriate one • Set “Connect Phone”. • Set “Set FTM “. • Set “Set Band” to “CDMA800”. • 10. Set “RF Channel “to Channel “384”. • 11. Set “LNA Range” to whatever needed. CompanyConfidential

  18. Cell Receiver Check from RF to IQ Use the following values to check the CDMA Cell Rx functionality from RF to IQ output. 1. Start FTM Mode with only the Rx path turned on and set LNA_GAIN_STATE=0. 2. Inject a -75 dBm CW signal of 881.82 MHz (i.e. 300 kHz offset from 881.52 MHz or 10 channels away). 3. Measure a 300 kHz tuning on the analyzer. You should see a typical -52 dBm IQ tuning for CDMA Cell. • FSQ26 signal analyzer settings • RBW-> 3 kHz • VBW-> 300 Hz • Sweep Time-> 450 ms • Reference Level-> -20 dBm • FREQ-> 300 kHz • Span-> 200 kHz shows the Cell spectrum with an inject tone at -75 dBm, as well as the IQ output test points. Note that DC is present on the IQ output test points. All test points should be approximately equal. CompanyConfidential

  19. Receiver DC Probe Points 3 2 Table 4 1 CompanyConfidential

  20. Receiver RF Probe Points In RF probe test, an external signal source of –25 dBm was injected to the RF input. Set LNA GAIN STATE = 3 .The signal was then traced throughout the receiver chains. An CMU200 call box is recommended. (Open non-signaling mode, press the SG soft button, and then select CW.) Inject a continuous wave (CW) for Cell (881.52MHz) at a fixed –25 dBm power level. Measurements were taken with the RF Probe. Signal levels are approximate, and the accuracy may be +/- 2 dB or more depending on the probe position and grounding. 2 3 1 Table 5 CompanyConfidential

  21. Rx Path Troubleshooting Rx path Faults Measure DC test points at Table 4. Is it OK? Check PM6610 Reflow PM6610 NO NO YES Measure Rx RF test points 1 at Table 5. Is it OK Reflow C813, L803 NO YES Measure Rx RF test points 2 at Table 5. Is it OK Reflow L804, C814, RFR6122 Change RFR6122 NO NO YES Measure Rx RF test points 3 at Table 5. Is it OK Reflow U800 NO YES Connect System Simulator to MS antenna. Check Antenna Module NO CompanyConfidential

  22. RF Path Loss • Set COM port and Input the maximum output power of the golden phone in dBm. Then, click “Start” button to run program. • After the program is done, the path loss will be shown on the screen and recorded for the RF calibration and Call Test program. Click “Quit” for closing this program. CompanyConfidential

  23. RF Tuning and Calibration Put the PWB on the module jig. Use the following steps to configure FTM for RF troubleshooting. • Connect RF test connector to a CMU200 or Agilent 8960. • Set SW1 to “FTM mode” in Module Jig. • Connect the mobile terminal to a PC via the Module Jig, and connect a power supply. • Open CCS Service SW and run RF Calibration function • Select “Tester Selection” Agilent 8960 or CMU200 • Set cable loss value as the result from running “Path Loss” to Loss (dB) • “Select COM port” to appropriate one • Press “Start”. • If tuning and calibration is successful , screen will shown “PASS”, otherwise, check the error code table CompanyConfidential

  24. RF Calibration Error Code • Error Message Table: CompanyConfidential

  25. Questions???Thank you for your attention! CompanyConfidential

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