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Nokia RM-94 Rf Troubleshooting Instructions

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Nokia Customer Care
6(b) - RF Troubleshooting
Instructions
Issue 1 04/2005
COMPANY CONFIDENTIAL
Copyright © 2005 Nokia. All Rights Reserved.

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  • Page 1 Nokia Customer Care 6(b) - RF Troubleshooting Instructions Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
  • Page 2 RM-94 Nokia Customer Care 6(b) - RF Troubleshooting Instructions This page has been intentionally left blank. COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.

  • Page 3: Table Of Contents

    GSM900 (including EGSM900) ..............36 GSM1800 ....................... 37 GSM1900 ....................... 38 DC Supply Voltage Check ................39 Receiver test points ..................42 Transmitter test points ..................44 Synthesizer test points ..................47 Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
  • Page 4 RM-94 Nokia Customer Care 6(b) - RF Troubleshooting Instructions This page has been intentionally left blank. COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.

  • Page 5: General Information On Rf Troubleshooting

    <AFC_value> and <AFC_slope>. According to the Production Test Spec- ification DCS02294-EN-0.5, the ambient temperature has to be within a temperature range of 22°C to 28°C. Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
  • Page 6 Most RF semiconductors are static discharge sensitive. ESD protection must be taken into account during repair (ground straps and ESD soldering irons). The RF ASIC Helgo is moisture sensitive. Therefore, the ASIC must be pre-baked prior to soldering. COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.

  • Page 7: Receiver Verification And Troubleshooting

    Select Scan Product Ctrl-R and wait until the phone information (RM-94) is shown in the lower right corner of the screen. Follow the instructions below. Measuring RX I/Q signals using RSSI reading Start Phoenix Service Software and open FBUS connection.

  • Page 8: Measuring Rx Performance Using Snr Measurement

    Wait until the phone information is shown in the lower right corner of the screen. Set operating mode to <local mode>. Select Testing RF Controls Select Band GSM 900 or GSM1800 or GSM1900 Active unit COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.

  • Page 9: Measuring Front-End Power Levels Using Spectrum Analyzer

    The levels that are given in this document are measured with a re- sistive probe (50 Ohm semi-rigid cable). Start Phoenix Service Software and open FBUS connection. Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.

  • Page 10: Measuring Analogue Rx I/Q Signals Using Oscilloscope

    Active unit Operation mode Continuous RX/TX Channel 37 or 700 or 661 The following picture should be displayed on an oscilloscope's screen if the receiver is working properly: COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.

  • Page 11: Fault Finding Chart Of The Receiver

    The phone layout has dedicated test points for the analogue RX I and Q signals (J512, J513). The BB part is used to measure those signals by means of RSSI reading. This works only if correct calibration has been carried out in production. Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
  • Page 12 DC levels, which superpose the RF signal at several test points. If both RX and TX path seem to be faulty, it has to be checked if the synthesizer is working. COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.
  • Page 13 C7519, C7520) and UEM VR4 = 2.8V ? (TP: VR4) Oscilloscope: Check supply filter Check supply voltages of RF ASIC: components (C2231, VR6 = 2.8V ? (TP:VR6) C7521) and UEM Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
  • Page 14 ASIC (Helgo) part 6 RX IQ levels ok (TPs: RXI, RXQ) ? BB error: Oscilloscope: Check UPP RF-BB serial interface ok? (TPs: RFBusData, RFBusClk, RFBusEna1) Change RF ASIC (Helgo) COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.
  • Page 15 Z7803) or component(s) of both output levels > Pref -3.5dB ? matching network depending on GSM1800 TPs: INM_D_RX / INP_D_RX selected band both output levels > Pref -6dB ? Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
  • Page 16 Both output signals > Pref +12dB Note RF ASIC N7500 seems to be RF levels are dependent on RF probe and have to be validated defective. Exchange N7500. with a known good sample. COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.
  • Page 17 Channel Select Filter Calibration ok ? Change RF ASIC (Helgo) Repair finished Make following tunings/calibrations Tx power level tuning Tx IQ tuning Rx calibration Rx Band Filter Response Calib. Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.

  • Page 18: Transmitter

    Start the preparations as described in chapter “General instructions for TX troubleshooting”. GMSK Set operating mode to local mode. Select Testing RF Controls Wait until the RF Controls window pops up Select Band GSM 900 Active unit COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.
  • Page 19 EDGE Set operating mode to local mode. Select Testing RF Controls Wait until the RF Controls window pops up. Select Band GSM 900 Active unit Operation mode Burst Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.

  • Page 20: Fault Finding Chart For Gsm900 Transmitter

    Fault finding chart for GSM900 transmitter In the following, it is assumed that the TXP signal is used as trigger signal. For that, a TXP test point is provided. COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.
  • Page 21 Check Power Loop RFOut_850/900) (TXC, Vpctrl900, DET) Power = +24.3 dBm, 897.4 MHz Spectrum analyzer Check RF@Test-Jig Pout Antenna Switch (Z7800) = +23 dBm, 897.4 MHz GSM900 TX Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.

  • Page 22: Gsm1800 Transmitter

    RF Controls Wait until the RF Controls window pops up Select Band GSM 1800 Active unit Operation mode Burst RX/TX Channel TX Power Level TX Data Type Random Edge COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.
  • Page 23 Wait until the RF controls window pops up. Select Band GSM 1800 Active unit Operation mode Burst RX/TX Channel TX Power Level TX Data Type All 1 Edge Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.

  • Page 24: Fault Finding Chart For Gsm1800 Transmitter

    Fault finding chart for GSM1800 transmitter In the following, it is assumed that the TXP signal is used as trigger signal. For that, a TXP test point is provided. COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.
  • Page 25 RFOut_1800/1900) Power = +21.6 dBm, (TXC, Vpctrl 1800 1900, 1747.8 MHz DET) Spectrum analyzer Check RF@Test-Jig Pout Antenna Switch (Z7800) = +20 dBm, 1747.8 MHz GSM 1800 TX Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.

  • Page 26: Gsm1900 Transmitter

    RF Controls Wait until the RF Controls window pops up. Select Band GSM 1900 Active unit Operation mode Burst RX/TX Channel TX Power Level TX Data Type Random Edge COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.
  • Page 27 RF Controls Wait until the RF Controls window pops up. Select Band GSM 1900 Active unit Operation mode Burst RX/TX Channel TX Power Level TX Data Type All1 Edge Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.

  • Page 28: Fault Finding Chart For Gsm1900 Transmitter

    Fault finding chart for GSM1900 transmitter In the following, it is assumed that the TXP signal is used as trigger signal. For that, a TXP test point is provided. COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.
  • Page 29 Check Power Loop RFOut_1800/1900) Power = +21.6 dBm, 1880 (TXC Vpctrl 1800 1900, DET) Spectrum analyzer Check RF@Test-Jig Pout Antenna Switch (Z7800) = +20 dBm, 1880 MHz GSM 1900 TX Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
  • Page 30 VPCTRL_1800 1900 V= 2.7 V Spectrum analyzer Check PA N7700 RF@Test-Jig Check Power Loop Pout (TXC, RFin 1800 1900, = +21.5 dBm, 1880 MHz DET) GSM 1900 TX COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.

  • Page 31: Synthesizer

    Open window “RF Controls” (menu Testing - RF Controls) Set the synthesizer to the following mode: Select Band GSM 1800 Active unit Operation mode Continuous RX/TX Channel The setup should now look like this: Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
  • Page 32 = 3685.6MHz. The tuning sensitivity of the VCO is typically 250MHz/V. The typical relation of VCO frequency and tuning voltage is shown in the following diagram: COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.
  • Page 33 VR7 = 2.78V is applied). If the frequency or the tuning voltage have other values than given above, see the fault finding chart for PLL syntesizer below. Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.

  • Page 34: Fault Finding Chart For Pll Synthesizer

    32sec. Check supply filter components : After that time the voltage is going C2235, R7516, C7526. down.) Check UEM and base band part. COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.
  • Page 35 It is important to note that the power supply VR3 of the VCTCXO is only switched off in the so called ‘Deep Sleep Mode’ and the power supply VR7 of the VCO (G7500) is switched off in so called ‘Sleep Mode’. Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.

  • Page 36: Frequency Tables

    3836.8 902.0 947.0 3608.0 3788.0 122 914.4 959.4 3657.6 3837.6 902.2 947.2 3608.8 3788.8 123 914.6 959.6 3658.4 3838.4 902.4 947.4 3609.6 3789.6 124 914.8 959.8 3659.2 3839.2 COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.

  • Page 37: Gsm1800

    RM-94 6(b) - RF Troubleshooting Nokia Customer Care GSM1800 Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.

  • Page 38: Gsm1900

    RM-94 Nokia Customer Care 6(b) - RF Troubleshooting GSM1900 COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.

  • Page 39: Dc Supply Voltage Check

    [ 1.32V ... 1.38V ] < R2901/C2901 > bias reference (RXIINN, RXQINN) refRF02 100 uA < R2900/C2900 > 2.7 V [ 2.95V ... 4.7V ] VBAT Triple band PA Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
  • Page 40 RM-94 Nokia Customer Care 6(b) - RF Troubleshooting This page has been intentionally left blank. COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.
  • Page 41 Nokia Customer Care Appendix 6A: Test Points Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.

  • Page 42: Receiver Test Points

    RM-94 Nokia Customer Care Appendix 6A: Test Points Receiver test points COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.
  • Page 43 RM-94 Appendix 6A: Test Points Nokia Customer Care Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.

  • Page 44: Transmitter Test Points

    RM-94 Nokia Customer Care Appendix 6A: Test Points Transmitter test points COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.
  • Page 45 RM-94 Appendix 6A: Test Points Nokia Customer Care Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
  • Page 46 RM-94 Nokia Customer Care Appendix 6A: Test Points COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.

  • Page 47: Synthesizer Test Points

    RM-94 Appendix 6A: Test Points Nokia Customer Care Synthesizer test points Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
  • Page 48 RM-94 Nokia Customer Care Appendix 6A: Test Points This page has been intentionally left blank. COMPANY CONFIDENTIAL Issue 1 04/2005 Copyright © 2005 Nokia. All Rights Reserved.

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