Nokia RH-21 Series Troubleshooting Manual

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CCS Technical Documentation
RH-21 Series Transceivers
Troubleshooting
 Nokia Corporation
Issue 1 05/2003 Confidential

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  Summary of Contents for Nokia RH-21 Series

  • Page 1 CCS Technical Documentation RH-21 Series Transceivers Troubleshooting  Nokia Corporation Issue 1 05/2003 Confidential...
  • Page 2 RH-21 Troubleshooting CCS Technical Documentation Nokia Corporation Confidential Page 2 Issue 1 05/2003...
  • Page 3: Table Of Contents

    Fault-finding charts for transmitter ................. 28 Power control loop ....................31 Synthesizer fault-finding ...................34 19.44 MHz reference oscillator ................34 RX VHF VCO......................36 TX VHF VCO ......................37 UHF Synthesizer ..................... 37 Nokia Corporation Issue 1 05/2003 Confidential Page 3...
  • Page 4 RH-21 Troubleshooting CCS Technical Documentation Nokia Corporation Confidential Page 4 Issue 1 05/2003...
  • Page 5: Troubleshooting

    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 Issue 1 05/2003 Confidential Page 5...
  • Page 6 Vbatt limits: 2.1V for internal state machine, 3V triggering whole startup • Regulator sequencing • HW "core" regulators "on": Vio, Vcore, VR3, Vflash1 • These regulators supply the processors, memory chip interfaces and clock source in RF • Reset releasing delay Nokia Corporation Confidential Page 6 Issue 1 05/2003...
  • Page 7 Initializes the DSP and concerning HW • Releases DSP reset -> DSP starts running Note: In the following figure, the RF_Clk frequency appears to be lower than 19.44MHz because of a too low oscilloscope sampling frequency (2kS/s). Nokia Corporation Issue 1 05/2003 Confidential Page 7...
  • Page 8: Phone Does Not Start Up Normally Or Does Not Stay On

    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 Confidential Page 8 Issue 1 05/2003...
  • Page 9 RH-21 CCS Technical Documentation Troubleshooting Figure 2: Fault tree, phone does not power up Nokia Corporation Issue 1 05/2003 Confidential Page 9...
  • Page 10: Flash Programming Does Not Work

    UPP, takes over handling the MCUSW trans- fer to Flash. 10 12 volts can be supplied to Vpp (by the prommer) to speed up flashing. Nokia Corporation Confidential Page 10 Issue 1 05/2003...
  • Page 11 "The programming status response from the Phone Flash informs about fail." Cx81 "The Prommer has detected a checksum error in the mes- FbusTx from UPP->UEM->Prommer sage, which it has received from the Phone." Nokia Corporation Issue 1 05/2003 Confidential Page 11...
  • Page 12: Charging

    If charging fails when the ACP-9 or the LCH-9 is used, but works with ACP-7, ACP-8, and LCH-8, check that the charge control pin of the system connector is connected to the ground. Nokia Corporation Confidential Page 12 Issue 1 05/2003...
  • Page 13: Audio Failures

    XEAR line. The Audio test box JBA-8 is needed. The Audio loop (Audio test/Hp In Ext Out) must be switched on by the Phoenix service software. This loop will connect audios only through the UEM. In this case, the Nokia Corporation Issue 1 05/2003 Confidential Page 13...
  • Page 14 3 Run the audio-loop self-test with Phoenix (BB Self Tests/ ST_EAR_DATA_LOOP_TEST). This loop will test the ear-data/mic-data lines between the UPP and the UEM. Earpiece or external microphone line does not work Figure 4: Fault tree, earpiece failure Nokia Corporation Confidential Page 14 Issue 1 05/2003...
  • Page 15: Accessory Detection

    2 The Ad-converter value of the hookint-line can be checked with the Xmic switch on an MJ-8 test jig. Changes normally from high to low when no accessory is connected. 3 When the headset HDC-5 is connected, the hookint-value should be between 600 and 800. Nokia Corporation Issue 1 05/2003 Confidential Page 15...
  • Page 16: Sleep Clock

    Sleep Clock Missing/nonfunctional 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 Confidential Page 16 Issue 1 05/2003...
  • Page 17 RH-21 CCS Technical Documentation Troubleshooting Figure 7: Fault tree, sleep clock Nokia Corporation Issue 1 05/2003 Confidential Page 17...
  • Page 18: User Interface

    RH-21 Troubleshooting CCS Technical Documentation User Interface Display/Keyboard lights do not work Figure 8: Fault tree, Display/Keyboard lights Nokia Corporation Confidential Page 18 Issue 1 05/2003...
  • Page 19 RH-21 CCS Technical Documentation Troubleshooting Display does not work Figure 9: Fault tree, Display does not work Nokia Corporation Issue 1 05/2003 Confidential Page 19...
  • Page 20: Receiver Troubleshooting

    Note: Before changing ASICs or filters, all solderings and missing components must be checked visu- ally. After any possible component changes, the phone must be tuned with the Phoenix autotune SW . Path of the received signal Block level description of the receiver: Nokia Corporation Confidential Page 20 Issue 1 05/2003...
  • Page 21: Fault-Finding Charts For Receiver Chain

    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 Figure 10: Fault tree, AMPS Nokia Corporation Issue 1 05/2003 Confidential Page 21...
  • Page 22 RH-21 Troubleshooting CCS Technical Documentation Nokia Corporation Confidential Page 22 Issue 1 05/2003...
  • Page 23 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 Change SAFARI (N801) Check UEM and start baseband troubleshoot Nokia Corporation Issue 1 05/2003 Confidential Page 23...
  • Page 24 RX-chain is OK check sensitivity: -110 dBm BER < 3% Check UHF Vc (from Start synthesizer C773) V: 2.2 ...2.6 V troubleshooting Check RXVHF Vc Start synthesizer (from C720). V: 0.7 troubleshooting ...1.3 Nokia Corporation Confidential Page 24 Issue 1 05/2003...
  • Page 25 RH-21 CCS Technical Documentation Troubleshooting Nokia Corporation Issue 1 05/2003 Confidential Page 25...
  • Page 26 "MCU ID message sending failed in the Phone." FbusTx from UPP->UEM->Prommer C105 "The Phone has not received Secondary boot codes Mbus from Prommer->UEM- length bytes correctly." >UPP(MbusRx) FbusRx from Prommer->UEM->UPP FbusTx from UPP->UEM->Prommer Nokia Corporation Confidential Page 26 Issue 1 05/2003...
  • Page 27 "The Phone has generated NAK signal during data block FbusTx from UPP->UEM->Prommer transfer." Cx85 "Data block handling timeout" Cx87 "Wrong MCU ID." RFClock UPP(Vcore) Startup Required startup for flashing Vflash1 VBatt flashing Nokia Corporation Issue 1 05/2003 Confidential Page 27...
  • Page 28: Transmitter Fault-Finding

    Start Phoenix software and set phone to the Analog mode. Set channel 383 and Power level 2. Connect RF cable to EXT RF connector and connect cable to Spectrum analyze input, and measure RF level. Notice insertion loss of the cable and attenuations. Nokia Corporation Confidential Page 28 Issue 1 05/2003...
  • Page 29 RH-21 CCS Technical Documentation Troubleshooting Nokia Corporation Issue 1 05/2003 Confidential Page 29...
  • Page 30 RH-21 Troubleshooting CCS Technical Documentation TDMA800 The transmitter chain is exactly the same as AMPS mode, with the exception of the IPA current. Therefore it is important that AMPS has no faults. Nokia Corporation Confidential Page 30 Issue 1 05/2003...
  • Page 31: Power Control Loop

    Power control loop Basically power detection is done with the Power detector module and power control is done inside Safari. Power detection is basically similar for both bands, except both bands have individual couplers. Nokia Corporation Issue 1 05/2003 Confidential Page 31...
  • Page 32 18.5 19.3 19.3 14.5 15.3 15.3 10.5 11.3 11.3 -0.7 -0.7 -4.7 -4.7 NOTE: DAC VALUES MAY VARY ABOUT +/- 20% NOTE: TXPWRDET is difference between TX on burst and off burst. Nokia Corporation Confidential Page 32 Issue 1 05/2003...
  • Page 33 27.3 1771 21.5 1023 23.3 1228 17.5 19.3 13.5 15.3 11.3 -0.7 -4.7 NOTE: DAC VALUES MAY VARY ABOUT +/- 20% NOTE: TXPWRDET is difference between TX on burst and off burst. Nokia Corporation Issue 1 05/2003 Confidential Page 33...
  • Page 34: Synthesizer Fault-Finding

    All synthesizers use divided VCTCXO signal as a reference signal for Phase-locked loop to provide correct LO-frequency. Baseband also needs a reference signal where it can generate the necessary clock signals and VCTCXO output signal is also buffered and connected to UPP. Nokia Corporation Confidential Page 34 Issue 1 05/2003...
  • Page 35 RH-21 CCS Technical Documentation Troubleshooting Fault-finding chart for 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 Issue 1 05/2003 Confidential Page 35...
  • Page 36: Rx Vhf Vco

    Phase detector and RX parts. Before I/Q modulator frequency is divided by 2. Fault-finding chart for RX VHF VCO Measure oscillator frequency over L730 coil. Don´t connect probe to pads! AMPS, CH383 Nokia Corporation Confidential Page 36 Issue 1 05/2003...
  • Page 37: Tx Vhf Vco

    In the upper band (TDMA1900), 2 GHz synthesizer frequency is fed straight to mixers. In the lower band (AMPS and TDMA800), 2 GHZ UHF VCO frequency signal is first divided by two inside Safari and then that divided signal is fed to mixers. The output frequency Nokia Corporation Issue 1 05/2003 Confidential Page 37...
  • Page 38 RH-21 Troubleshooting CCS Technical Documentation of the VCO depends on the DC control voltage, which is controlled by the PLL circuit inside Safari. Fault-finding chart for UHF Synthesizer Nokia Corporation Confidential Page 38 Issue 1 05/2003...