Nokia NKC-1X Series Troubleshooting Instructions
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Nokia NKC-1X Series Troubleshooting Instructions

Nokia NKC-1X Series Troubleshooting Instructions

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CCS Technical Documentation
NKC-1X Series Transceivers
Troubleshooting Instructions
Nokia Corporation
Issue 1 02/03

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  • Page 1 CCS Technical Documentation NKC-1X Series Transceivers Troubleshooting Instructions Nokia Corporation Issue 1 02/03...

  • Page 2: Table Of Contents

    Path of the transmitted signall ................. 25 Fault finding charts for the transmitter..............25 Synthesizer Troubleshooting ..................29 19.44 MHz reference oscillator ................29 RX VHF ........................31 TX VHF........................32 UHF SYNTHESIZER ..................... 33 Nokia Corporation Page 2 Issue 1 02/03...
  • Page 3 Fig 13 Detected voltage levels.....................29 Fig 14 Fault tree: 19.44 MHz oscillator................30 Fig 15 Fault tree: RX VHF VCO..................31 Fig 16 Fault tree: TX VHF VCO ..................32 Fig 17 Fault tree: UHF Synthesizer ..................33 Nokia Corporation Issue 1 02/03 Page 3...

  • Page 4: Transceiver Troubleshooting

    In the local and test mode, the baseband can be controlled through MBUS or FBUS (FBUS is recommended) connections using Phoenix service software. Troubleshooting Note: Most of the baseband repair actions require removing the baseband shield. The shield must not be removed unless separately authorized by the program. Nokia Corporation Page 4 Issue 1 02/03...

  • Page 5: Power Up Faults

    • HW "core" regulators "on": Vio, Vcore, VR3, Vflash1 • These regulators supply the processors, memory, chip interfaces and clock source in RF • Reset releasing delay • Supply voltages stabilize to their UEM HW default values Nokia Corporation Issue 1 02/03 Page 5...
  • Page 6 • Initializes the DSP and concerning HW • Releases DSP reset -> DSP starts running Note: In figure below, the RF_Clk frequency appears to be lower than 19.44MHz because of a too low oscilloscope sampling frequency (2kS/s). Nokia Corporation Page 6 Issue 1 02/03...
  • Page 7 Note: The sleepclock starts running in the crystal circuitry (B200) immediately when the battery voltage is supplied. 3 Software running •Default value for Vcore is 1.5 volts when the software is running. •Cbus (1.08MHz) clock starts running. Nokia Corporation Issue 1 02/03 Page 7...
  • Page 8 The easiest way to check if the software is running when the phone takes an abnormal amount of current is to measure the cbusclk and Vcore. The Dbus clock (programmable 9.72MHz) is not automatically visible in the test and local modes. Nokia Corporation Page 8 Issue 1 02/03...
  • Page 9 Change the FAIL goes up to 1.8V UEM (D200) FAIL Measure J406. Should Re-flash phone be 1.08 MHz Programming Programmng ok, fails but phone doesn't start Go to flash failure Change UPP chart (D400) Nokia Corporation Issue 1 02/03 Page 9...

  • Page 10: Flash Programming Does Not Work

    9 Prommer then sends the Algorithm Code corresponding to the HW parameters, and this algorithm, when run in UPP, takes over handling the MCUSW transfer to Flash. 10 12 volts can be supplied to Vpp (by the prommer) to speedup flashing. Nokia Corporation Page 10 Issue 1 02/03...
  • Page 11 IDs received from the target phone." A387 "The MCU ID in the MCUSW.” C601 "The prommer has detected that Vpp volt- Vpp from prommer - >Flash age level has dropped below the limit" Nokia Corporation Issue 1 02/03 Page 11...

  • Page 12: Charging

    If charging fails when the LCH-9 is used, and works with ACP-7 and ACP-8, check that the charge control pin of the system connector is connected to the ground. Nokia Corporation Page 12 Issue 1 02/03...

  • Page 13: Audio Failures

    This loop will connect audios only through the UEM. In this case, the UPP is not used. In case the internal microphone/XEAR fails: Feed the tone to the microphone and measure the signal from the XEAR line. The Audio test box JBA-8 is needed. The Nokia Corporation Issue 1 02/03 Page 13...
  • Page 14 Fault tree, earpiece fail Figure 5: Earpiece doesn't work Feed 1KHz to Xmic Run audio-loop Fail by JBA-8 and selftest with measure from phoenix earpiece Fail Check R157 Check Change UPP earpiece Change UEM Nokia Corporation Page 14 Issue 1 02/03...

  • Page 15: Accessory Detection

    MJS-18 test jig. Changes normally from high to low when no acces- sory is connected. 3 When the headset HDC-5 is connected, the hookint- value should be between 600 and 800. Nokia Corporation Issue 1 02/03 Page 15...

  • Page 16: Sleep Clock

    Sleep Clock Missing/non-functional sleep clock causes • entering sleep mode fails (higher current consumption -> shorter standby time). • Baseband self tests cannot be run. • Phone clock (on display) does not function properly. Nokia Corporation Page 16 Issue 1 02/03...
  • Page 17 Figure 8: Fault tree, sleep clock Sleep mode not working Fail Fail Check C203 Measure sleep clock Measure sleep clock &C204 from B200 from J204 Change UPP Change UEM Change B200 (D400) (D200) Nokia Corporation Issue 1 02/03 Page 17...

  • Page 18: Display/Keyboard Lights Do Not Work

    Check R300 (Display) and Replace FAIL R301 (Keyboard) resistor(s) Check LEDs Replace V300...V303 (Display) and FAIL LED(s) V304...V309 (Keyboard) Use Display Test in Replace UEM FAIL Phoenix to set lights ON/OFF Nokia Corporation Page 18 Issue 1 02/03...

  • Page 19: Display Does Not Work

    Run LCD test in Check Replace Phoenix capacitors FAIL FAIL capacitors(s) (BB Self Tests/ C302...C304 ST_LCD_TEST) Use Display Test in Phoenix to Replace Replace FAIL check if display elastomer display module works FAIL Replace display module Nokia Corporation Issue 1 02/03 Page 19...

  • Page 20: Buzzer Does Not Work

    Z301 that all lines come through. If not, change Z301. If the keyboard still does not oper- ate normally, try to use the Keyboard test in Phoenix to see if the pressed key is identi- fied. If it is not identified, change the UPP(D400). Nokia Corporation Page 20 Issue 1 02/03...

  • Page 21: Receiver Troubleshooting

    (Antenna/ext RF) – Diplexer – Duplexer – Low Noise Amplifier (LNA) – RX band filter – First mixer – 135.54 MHz RX IF filter – IF-amplifier – second mixer – 14 kHz low-pass fil- ter – adjustable IQ amplifier – Baseband. Fault finding charts for receiver chain AMPS Nokia Corporation Issue 1 02/03 Page 21...
  • Page 22 Check UHF Vc (from Start synthesizer C773) V: 1.8 ...2.1 V troubleshooting Check RXVHF Vc Start synthesizer (from C720). V: 0.7 troubleshooting ...1.3 Apply 881.49 MHz -30dBm , sine signal to external RF-connector X900. Nokia Corporation Page 22 Issue 1 02/03...
  • Page 23 MIX1Ain P/N you should see strong RF signal (N801) level at 881.49 MHz. Exact level is difficult to define here because variable impedances in RX path. Also used probe type affects to the results. Nokia Corporation Issue 1 02/03 Page 23...
  • Page 24 Check RF level by signals at I: J801(+), Start synthesizer L730 without having J803(-) and Q: troubleshoot electrical contact at J804(+), J802(-) 271.08 MHz TACO Change SAFARI (N801) Check UEM and start baseband troubleshoot Nokia Corporation Page 24 Issue 1 02/03...

  • Page 25: Transmitter Troubleshooting

    2 Set the channel to 383 and the power level to 2. 3 Connect the RF-cable to the Ext RF connector. 4 Connect the cable to the Spectrum analyzer input. 5 Measure the RF level. Note: Insertion loss of the cable and attenuations. Nokia Corporation Issue 1 02/03 Page 25...
  • Page 26 Z960 IL:2dB IF: -20 dBm +3 /-6 dB Check TX RF (836.49 MHz) output power and from balun T961 TACO Change up converter @ up converter input RF:0dBm+/-6dB RF: 0 dBm +/- 6dB Nokia Corporation Page 26 Issue 1 02/03...
  • Page 27 RF conn ~0.1 dB Start Power control troubleshooting TDMA800 The transmitter chain is exactly the same as the AMPS-mode, except for the IPA current, and thus it is important that the AMPS have no faults. Nokia Corporation Issue 1 02/03 Page 27...
  • Page 28 Table 3: Typical detected voltages at power levels PL2...PL10 (DB) for single bander 800A 800D Pout TXPWRDET Pout TXPWRDET 24.5 1600 27.3 1919 21.0 1145 23.3 1250 17.5 19.3 13.5 15.3 11.3 -0.7 §0 -4.7 Note: DAC values may vary about +- 20% Nokia Corporation Page 28 Issue 1 02/03...

  • Page 29: Synthesizer Troubleshooting

    TACO. It is used as a reference signal in TACO and also fed out as buffered clock signal to UPP. All synthesizers use divided 19.44 MHz signal as a reference Nokia Corporation Issue 1 02/03 Page 29...
  • Page 30 Phase locked loop to provide correct LO-frequency. Figure 15: Fault tree: 19.44 MHz oscillator START HERE! Is VCTCXO Change oscillating? VCTCXO 2.No 19.44MHz 1.No Check voltage C792 2.78 V Check resistor R792 Nokia Corporation Page 30 Issue 1 02/03...

  • Page 31: Rx Vhf

    V 7 2 5 , C 7 2 4 , C 7 2 5 , L730, C740, C741, R741 L 7 3 0 a n d D C b lo c k C 7 2 6 Nokia Corporation Issue 1 02/03 Page 31...

  • Page 32: Tx Vhf

    VHF VCO output signal is divided by 2 and fed to the modulator. Figure 17: Fault tree: TX VHF START HERE Is frequency locked to Replace TACO 2.No 361,08 MHz? 1.No OK Check resonator components: L746, C720, C721 and R721 Nokia Corporation Page 32 Issue 1 02/03...

  • Page 33: Uhf Synthesizer

    4. No START HERE! 2. No 2.No Is frequency locked Is EVM OK? to 2034,06 MHz? 1.No Check loopfilter Check loopfiler components components and balun Check VCO operatig Check resistor voltage: R774 2.78 V Nokia Corporation Issue 1 02/03 Page 33...
  • Page 34 NKC-1X Troubleshooting Instructions CCS Technical Documentation This page intentionally left blank. Nokia Corporation Page 34 Issue 1 02/03...

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