Nokia RH-41 Series Troubleshooting Instructions
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Nokia RH-41 Series Troubleshooting Instructions

Nokia RH-41 Series Troubleshooting Instructions

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CCS Technical Documentation
RH-41 Series Transceivers
Troubleshooting Instructions
Nokia Corporation
Issue 2 09/2003
Confidential

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  • Page 1 CCS Technical Documentation RH-41 Series Transceivers Troubleshooting Instructions Nokia Corporation Issue 2 09/2003 Confidential...
  • Page 2 RH-41 Troubleshooting Instructions CCS Technical Documentation Nokia Corporation Page 2 Confidential Issue 2 09/2003...

  • Page 3: Table Of Contents

    Fault-finding charts for the transmitter ..............27 Synthesizer Troubleshooting ..................33 19.44 MHz reference oscillator ................33 RX VHF ........................34 Fault-finding chart for RX VHF VCO ..............35 TX VHF........................35 UHF Synthesizer ..................... 36 Nokia Corporation Issue 2 09/2003 Confidential Page 3...
  • Page 4 RH-41 Troubleshooting Instructions CCS Technical Documentation Nokia Corporation Page 4 Confidential Issue 2 09/2003...

  • Page 5: Transceiver 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. Note: The phone’s ESN has to re-written to the UEM, if the UEM is replaced. This can be done only in Central Service. Nokia Corporation Issue 2 09/2003 Confidential Page 5...

  • Page 6: Power Up Faults

    • Reset releasing delay • Supply voltages stabilize to their UEM HW default values • RFCLK grows to full swing • The core is ready to run but waiting for the PURX release Nokia Corporation Page 6 Confidential Issue 2 09/2003...
  • Page 7 • Releases DSP reset -> DSP starts running Note: In the following figure, the RF_Clk frequency appears to be lower than 19.44 MHz because of a too low oscilloscope sampling frequency (2kS/s). Figure 1: Power up sequence Nokia Corporation Issue 2 09/2003 Confidential 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 Confidential Issue 2 09/2003...
  • Page 9 Measure J406 (it Reflash phone FAIL Programming fails should be 1.08MHz) Change Go to Flash Programming OK but phone doesn't start UPP (D400) Failure flowchart Figure 2: Fault tree, phone does not power up Nokia Corporation Issue 2 09/2003 Confidential 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 speed up flashing. Nokia Corporation Page 10 Confidential Issue 2 09/2003...
  • Page 11 IDs received from the target phone." A387 "The MCU ID in the MCUSW.” C601 "The prommer has detected that Vpp voltage Vpp from prommer - >Flash level has dropped below the limit" Nokia Corporation Issue 2 09/2003 Confidential 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 Confidential...

  • Page 13: Audio Failures

    In case the internal microphone/XEAR fails: Feed the tone to the microphone and mea- sure the signal from the XEAR line. The Audio test box (JBA-8) is needed. The Audio loop Nokia Corporation Issue 2 09/2003 Confidential Page 13...
  • Page 14 P hoenix meas ure from earpiec e C hec k R 157 F ail C hange UP P C hec k earpiec e C hange UE M Figure 4: Fault tree, earpiece failure Nokia Corporation Page 14 Confidential Issue 2 09/2003...
  • Page 15 C hec k R 156, C 151, F ail C 152, C 157, L 164 C hec k mic rophone C hange UP P C hange UE M Figure 5: Fault tree, microphone failure Nokia Corporation Issue 2 09/2003 Confidential Page 15...

  • Page 16: Accessory Detection

    Check R151 and Check R152, C161, C160 L160 Check R150, R201, Check bottom C104, C106, L162, connector L163 * On local or test Change UEM mode Headint <400 Figure 6: Fault tree, accessory detection Nokia Corporation Page 16 Confidential Issue 2 09/2003...

  • Page 17: Sleep Clock

    Sleep mode not working Measure sleep clock Check C209 and Measure sleep clock Fail Fail from B200 C210 Change UPP (D400) Change UEM (D200) Change B200 Figure 7: Fault tree, sleep clock Nokia Corporation Issue 2 09/2003 Confidential Page 17...

  • Page 18: Display/Keyboard Lights Do Not Work

    V 304...V 309 (K eyboard) Us e Dis play T es t in P hoenix to s et lights R eplac e UE M F ail ON/OF F Figure 8: Fault tree, Display/Keyboard lights Nokia Corporation Page 18 Confidential Issue 2 09/2003...

  • Page 19: Display Does Not Work

    P hoenix to c hec k if R eplac e elas tomer F ail Module dis play works F ail R eplac e Dis play Module Figure 9: Fault tree, Display does not work Nokia Corporation Issue 2 09/2003 Confidential Page 19...

  • Page 20: Buzzer Does Not Work

    (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. Nokia Corporation Page 20 Confidential...

  • Page 21: Fault-Finding Charts For Receiver Chain

    SINAD AF:>12 dB Check UHF Vc (from Start troubleshooting C773) V: 1.8...2.1V Check RXVHF Vc (from C740). Start troubleshooting V:0.7...1.3 Apply 881.49 MHz -30dBm sine signal to external RF connector X900 Nokia Corporation Issue 2 09/2003 Confidential Page 21...
  • Page 22 Check RF level at Change RX800 Band discrete RX800 band filter Filter components around input (Z820) (Z820) Taco before Taco MIX1Ain P/N changing. Check RF level at Change Taco (N801) MIX1Ain P/N Nokia Corporation Page 22 Confidential Issue 2 09/2003...
  • Page 23 I: J801(+), L730 without having Start synthesizer J803(-) and Q: electrical contact at troubleshooting J804(+), J802(-) 271.08MHz Taco Change Taco (N801) Check UEM and start baseband troubleshooting Figure 10: Fault tree. AMPS Nokia Corporation Issue 2 09/2003 Confidential Page 23...
  • Page 24 RF test UI and TDMA1900 RX chain check sensitivity: -110 is OK dBm BER < 3% Check UHF Vc (from Start synthesizer C773) V:2.2...2.6V troubleshooting Check RXVHF Vc Start synthesizer (from C740), troubleshooting V:0.7...1.3 Nokia Corporation Page 24 Confidential Issue 2 09/2003...
  • Page 25 (Z962) filter RX output port) components around V850. Taco Check RF level at Check voltage at RX1900 band filter C854 out (V850 in), Change Taco (N801) (Z850) input V: about 2.7V Nokia Corporation Issue 2 09/2003 Confidential Page 25...

  • Page 26: Transmitter Troubleshooting

    DAMPS). 2 It is useful to select the mid channel (383 for AMPS/DAMPS) and the power level 2. Note: After any component change, tune the phone with the Phoenix autotune SW . Nokia Corporation Page 26 Confidential Issue 2 09/2003...

  • Page 27: Path Of The Transmitted Signall

    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 2 09/2003 Confidential Page 27...
  • Page 28 Change Taco or Z960 or Z960 out:-20dBm+3/-6dB IL:2dB IL:2dB Check TX RF from balun T961 Taco (836.49MHz) output input RF:0dBm+/-6dB power from balun Change Taco T961 input RF: 0dBm+/-6dB Nokia Corporation Page 28 Confidential Issue 2 09/2003...
  • Page 29 (Z907) and RF connector (X900) Change Z906 or Z907 insertion loss. or RF connector Dupl IL ~2.2dB Dipl ~0.35dB RF conn ~0.1dB Start power control troubleshooting Figure 12: Fault tree. Transmitter troubleshooting Nokia Corporation Issue 2 09/2003 Confidential Page 29...
  • Page 30 Check TX IF input power Change Taco or Z960 (181.80MHz)@Z960 Taco IF: -20dBm+3/-6dB Check TX RF (1879.98MHz) output Change Taco power @T960 input Taco RF: 0dBm+/-6dB Check Z961 input and output power Change Z961 IL:-3dB Nokia Corporation Page 30 Confidential Issue 2 09/2003...
  • Page 31 (Z906), diplexer (Z907) and RF connector (X900) Change Z906 or Z907 insertion loss or RF connector Dupl IL ~2.2dB Dipl ~0.35dB RF conn ~0.1dB Start power control troubleshooting Figure 13: TDMA 1900 troubleshooting Nokia Corporation Issue 2 09/2003 Confidential Page 31...
  • Page 32 19.3 14.5 15.3 15.3 10.5 11.3 11.3 -0.7 -0.7 §0 -4.7 -4.7 Note: DAC values may vary about +- 20% Note: TXPWRDET is the difference between TX on burst and off burst. Nokia Corporation Page 32 Confidential Issue 2 09/2003...

  • Page 33: 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 signal for Phase locked loop to provide correct LO frequency. Nokia Corporation Issue 2 09/2003 Confidential...

  • Page 34: Rx Vhf

    271.08 MHz. Operating frequency is locked in Phase locked Loop. RX VHF PLL output signal is integrated in Taco. There are only four external components: VCO coil (L730), and loop filter components C740, C741, and R741. Nokia Corporation Page 34 Confidential...

  • Page 35: Fault-Finding Chart For Rx Vhf Vco

    VHF VCO output signal is divided by 2 and fed to the modulator. 1. START HERE 3. Replace Taco Is frequency locked to 361.08MHz? 2. No 1. No 2. Check resonator components: L746, C720, C721, R721 Figure 18: Fault tree: TX VHF Nokia Corporation Issue 2 09/2003 Confidential Page 35...

  • Page 36: Uhf Synthesizer

    Is frequency locked to 2. No 2034.06MHz? 1. No Check loopfilter 1. No Check loopfilter components components and balun Check VCO operating voltage: Check resistor R774 2.78V Figure 19: Fault tree: UHF Synthesizer Nokia Corporation Page 36 Confidential Issue 2 09/2003...

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