Nokia Customer Care NEM-4 Series Transceivers 6 - Troubleshooting Instructions Issue 2 09/2004 Copyright © 2004 Nokia Corporation Company Confidential Page 6-1
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care [This page left intentionally blank.
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions Table of Contents Page No Introduction to NEM-4 Troubleshooting ....................................................................... 5 General guidelines for NEM-4 Troubleshooting ........................................................... 5 Tools needed for troubleshooting ................................................................................5 General guidelines ..................................................
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care DCS 1800/PCS 1900 Tx fault finding flow chart ......................................................86 Path of the transmitted GSM1800/1900 signal ..........................................................87 Fault finding chart for GSM1800/GSM1900 transmitter ..........................................89 NEM-4 Synthesizer......................................................................................................
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Introduction to NEM-4 Troubleshooting This document is intend to be a guide for localizing and repairing electrical faults in the NEM-4 device. First there is a brief guide for fault localizing. Then fault repairing is divided into Troubleshooting paths. Before any service operation you must be familiar with the NEM-4 product and module level architecture.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Solder joints OK? Continue with specific trouble shooting procedure for the module: If there is an obvious fault, repair it before reflashing the device Flash first if a fault is not obvious If flashing is not working go to flashing trouble shooting Due to CSP packages short circuits or broken solder joints are not easily seen.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Troubleshooting Paths Dead or jammed device Disassemble Check UI connector display Replace UI module display Issue 2 09/2004 Copyright © 2004 Nokia Corporation Company Confidential Page 6-7
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Partially damaged device If the device is working, but some functionality is missing try to localize where the problems is and see relevant part of this manual. E.g audio is not working see “Audio Troubleshooting” , if charging is not working see chapter Charging Troubleshooting etc.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care These symptoms lead to relevant part of energy management Troubleshooting Problems related to UI: “Keypad is not working” ”Backlight is dim” ”Backlight not even” ”Backlight is blinking” ”Keypad or display backlight is not working” ”Display related problems” “Rocker is not working” Most common RF related symptoms: “Call cannot be made” ”Phone does not find signal” ”Call is often dropped” See RF Troubleshooting.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Test Point Signal description J004 N330 (Boomer) _SHUTDOWN (from WD2 GENIO8) J906 ADSP S11 (WD2->ADSP through UEM level shifter IRLEDC) J907 ADSP S13 (ADSP->WD2 through UEM level shifter IRRXN) J558 ADSP CLKR0 (BCLK_OUT) to AIC J559 ADSP DR0 (DIGITAL_AUDIO_IN) from AIC J560 ADSPDX0 (DIGITAL_AUDIO_OUT) to AIC J561 ADSP FSX0 (LRC_OUT) to AIC J562 ADSP C1 (ADSP Flash OE#) J563 ADSP C2 (ADSP Flash WE#) J567 ADSP C3 (ADSP Flash CE1#
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Test Point Signal description J183 GENIO13 (ROCKER4) J912 LCD signal J185 LCD signal J186 LCD signal J187 LCD signal J188 LCD signal J189 LCD signal J190 LCD signal J191 LCD signal J113 LCD signal J114 LCD signal J905 UEM DLIGHT (Display LED driver control) J404 SIM Data J405 SIM Clock J406 SIM Reset J913 MMC CMD J914 MMCDAT0 J577 N470 Dir3 J579 N470 Dir2 J576 N470 A1 J578 N470 A3 J59
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care “CONTACT SERVICE” on display CONTACT SERVICE on display (Self-tests by Phoenix) Display information: “Contact Service” This fault means that software is able to run and thus the watchdog of UEM can be served. Selftest functions are executed when the phone is powered on and if one or more selftest functions fail, the message “Contact Service” is shown on the display.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Baseband HW Subarea Troubleshooting Flashing troubleshooting NEM-4 has three memory components installed on the main pwb. The best indication of which one is causing problems can be obtained by flashing the device. It has to be kept in mind that all three flashes are interfaced with UPP WD2 asic that might it self have some problems. The necessary steps are described below.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Memory faults page2 "Secondary receive fail" or "Algorithm send failed" message? Yes Change UPP_WD2 Change SDRAM No Yes Prommer message about sdram failure? Yes Activity ActivityininSDRAM sdram Clk clkJ314 J108 pad? pad? Yes No No Voltages Voltages VmemA VmemAand and Vio OK? VioA ok? No Change UPP_WD2 Wrong manufacturer ID and device ID Change Flash Chip according to Phoenix messages If both chips report wrong ID'
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care ADSP flashing troubleshooting ADSP flash environment consists of ADSP, ADSP flash, EMIF (external memory interface), communication interfaces (USB and UPP/UEM), ADSP flash protecting control and power supplies for ADSP and ADSP flash.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Energy management troubleshooting Device does not stay on If the device is switched off without any visible reason, there may be problems in the following areas: • UEM watchdog problem (WD is not updated by SW) • BSI line problem (BSI line is floating => contact failure) • Battery line problem • Soldering problem The most likely reason is UEM WD (watchdog), which turns the device off after about 32 seconds if SW is jam
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions General power checking Use service tool FLA-41R. Battery voltage should be at least 3.6V. After phone disassembly, use module jig MJS-8Q. Short circuit in Vbatt1-3, VBATHF voltagelines. lines.Try Try to to VbattbbororBTVbattihf find short circuit. Check components which are able to short cuircuit these lines, (filtering components etc.) Vbatt1-3,VBATHF, Vbatbb, BT voltage meas.from Vbattihf meas.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care VCOREA troubleshooting Page 6-18 Copyright © 2004 Nokia Corporation Company Confidential Issue 2 09/2004
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions VMEMA troubleshooting Issue 2 09/2004 Copyright © 2004 Nokia Corporation Company Confidential Page 6-19
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Audio power troubleshooting Page 6-20 Copyright © 2004 Nokia Corporation Company Confidential Issue 2 09/2004
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Clocks troubleshooting Clocks include the following: RF-clock ADSP Clock DBUS, CBUS clocks Flash and SDRAM clocks Sleep clock Bluetooth clock SIM clock MMC clock NEM-4 has three external oscillators for baseband clocking. The main clock is generated by 26MHz oscillator (B601) and routed through Mjoelner RF ASIC to UPP_WD2 engine ASIC.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care When the flashing of the device does not succeed, but powering is OK, follow these instructions. Note: The absence of clocks may indicate that the device (put phone to LOCAL mode when the sleep is not allowed or press buttons so that phone is not in sleep mode) is in sleep mode. Make sure that the device is not in sleep during clocks measuring.
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions 900mA Remove and reconnect battery and charger few times before you start to measure device. This check ensures that the fault really exists.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Figure 3: Charging Troubleshooting Phoenix and JBV1/MJF26 Check BL5-C, Btemp, BSI, X606, R385, R404 X381, Page 6-24 Copyright © 2004 Nokia Corporation Company Confidential Issue 2 09/2004
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions Nothing happens when ACP-12 ACP-2 is connected Measure Vchar at C384. Is it Is it at C388 and C387. >3.0Vdc? F381, TVS, Check F380, V383 V381 and and L381. L380 Check R191 Check R191, and Z190. is itthey OK?ok? Are Replace Replace R191 R190/Z190 and and retest retest.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Energy management calibration During energy management calibration A/D-converter, BSI, Btemp, Battery voltage, Charger voltage and Charger current are calibrated.
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions Vbatt offset and Gain: Inspect Vbatt lines and component in it. Vchar over limits: Inspect components which are connected Vchar line: V383, F381 and L381 Ichar over limits: Inspect components which are connected at Vchar line. If those are OK, First change current sense resistor (R191), if calibration is not still successful change UEM. Calibration can be checked using ADC-readings.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Maximum tolerances are: Reading Check point Tolerance Reading Check point Tolerance Vbatt SCAL 4.2V ± 25mV Vchar 8.4V ± 40mV Ichar 500mA ± 20mA BSI 75k ± 1.3kohm Btemp 273K(47k) ± 5K Backup battery Symptom of backup battery fault is Real Time Clock loses the correct time during short main battery removal. The same symptom can also be seen when the backup battery is empty.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care SIM card The whole SIM interface locates in two chips UPP_WD2 and UEM. UEM contains the SIM interface logic level shifting. UPP provides SIMClk through UEM to the SIM. SIM interface supports both 3 V and 1.8 V SIMs.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Figure 4: SIM Power Up. Ch1 Vsim Ch2 Reset Ch3 Clock Ch4 I/O Measured with 3Vsim Figure 5: SIM answer to reset.
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions Figure 6: SIM Clk 3.25MHz. SIM_Clk_3.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care "Insert SIM Card" in device display although card is inserted START Perform SIM BB self tests. Are they OK? No Perform BB SIM self tests. Are they OK? Replace UEM Yes Perform Phoenix SIM tests. Are they OK? Replace UPP_WD2 Yes No Check SIM connector Is it OK? Yes Is the SIM Detection Reliable? No No Check & clean connector contacts & pads Replace connector Yes No Measure VSIM. Is it 1.8/3.
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions Audio troubleshooting Figure 7: Audio routing window in Phoenix Issue 2 09/2004 Copyright © 2004 Nokia Corporation Company Confidential Page 6-33
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Microphone Page 6-34 Copyright © 2004 Nokia Corporation Company Confidential Issue 2 09/2004
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions Earpiece Check that holes are not coated.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care IHF Page 6-36 Copyright © 2004 Nokia Corporation Company Confidential Issue 2 09/2004
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Headset troubleshooting Issue 2 09/2004 Copyright © 2004 Nokia Corporation Company Confidential Page 6-37
NEM-4 Company Confidential 6 - Troublehsooting Instructions Page 6-38 Copyright © 2004 Nokia Corporation Company Confidential Nokia Customer Care Issue 2 09/2004
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Memory troubleshooting Most memory related errors are found through flashing the device, flashing the device is therefore recommended before any of the steps described in this chapter. Check flashing Troubleshooting section first. There are however a few memory related errors that cannot be found through flashing. • SDRAM(D312) partially damaged.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care MMC troubleshooting Page 6-40 Copyright © 2004 Nokia Corporation Company Confidential Issue 2 09/2004
Nokia Customer Care Issue 2 09/2004 Company Confidential NEM-4 6 - Troublehsooting Instructions Copyright © 2004 Nokia Corporation Company Confidential Page 6-41
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care USB troubleshooting Page 6-42 Copyright © 2004 Nokia Corporation Company Confidential Issue 2 09/2004
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care VIBRA There may be three kind of problems concerning vibra; it doesn't rotate at all, it's noisy or it's continuously on. The noisiness is usually caused by the surrounding mechanics when the rotating mass has contact to it.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care ZOCUS Read phone current consumption in Phoenix Y OK? SW Error Reflash N N Check N301 and other components Replace damaged components and retest Replace component UI Troubleshooting UI troubleshooting cases This document describes how the trouble shooting should be done if there is something wrong with the UI function. If the problem is due to the display or keymat PWB the whole UI module should be replaced.
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions Keymat backlight If the keymat backlight is non-functional and the backlight driver voltage is generated correctly, then there is either a problem with the connector or the UI module. Note: that it is possible for an LED to be non-functional and for all other LEDs to still be working.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Keyboard If keyboard doesn’t work, follow the troubleshooting flow chart below: Page 6-46 Copyright © 2004 Nokia Corporation Company Confidential Issue 2 09/2004
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Display blank Display blank Y Replace Display Display ok N Check test points J113, J114, J185-J191 OK? Y Change V101 Z130 N Change UPPWD2 Issue 2 09/2004 Copyright © 2004 Nokia Corporation Company Confidential Page 6-47
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Backlight does not turn on Page 6-48 Copyright © 2004 Nokia Corporation Company Confidential Issue 2 09/2004
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care FM Radio Troubleshooting FM radio component layout Figure 8: Component placement Figure 9: Trace layout.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Figure 10: FM radio block layout. Components C001 and C002 are not shown in the picture. Those components are placed near audio connector X002. Figure 11: FM Radio control window.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care FM radio troubleshooting diagram Notes to "FM Radio Troubleshooting diagram" Use 1MHz 1X probe when measuring Audio and clock signals with oscilloscope. Use active RF probe when measuring frequencies with spectrum analyzer. Note 1. RF test signal parameters: • Amplitude, A, –67.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Figure 12: FM radio troubleshooting diagram Set phone into local mode. Start FM radio. Check C521, C375, C522, R375, R505 C374, R358 and measure 32kHz clock signal L511 from J359, retest starting. Start OK ? NO Does the radio start ? NO Measure voltages from pins 7 and 34, is it –2.7 V ? Retest starting. Start OK now ? NO YES Check N500 N356 solders (pins 5,6,7,8,9,11, 12,13,17,33,34,35, 36, 37.
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions Diagrams of FM radio signals Figure 13: Oscilloscope screen shot, Audio output Signal 1: Audio output from PWB test points J103 and J104, with FM test signal, volume 100%. Signal 2: Audio output from FM radio pins 22 and 23(same as in C017 and C018), with FM test signal Figure 14: FM radio clock from L511, 32 kHz frequency clock signal, when radio is on.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Figure 15: FM frequency from FM radio pin 37, the other end of L500, with FM test signal 15:51:49 03 JUL 2002 REF -20.0 dBm MKR 97.9280 MHz -71.03 dBm #AT 0 dB PEAK LOG SWEEP CONT SGL FREE RUN 10 dB/ VIDEO LINE WA SB EXTERNAL CORR SC FS SYNC CRD CENTER 98.0000 MHz #RES BW 10 kHz SPAN 300.0 kHz #SWP 1.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care RF Troubleshooting Abbreviations in fault finding charts BB Base band DCS/PCN GSM1800 PCS GSM1900 EGSM Extended GSM900 ESD Electro Static Discharge GPRS General Packed Radio Service HSCSD High Speed Circuit Switched Data LO Local Oscillator PA Power Amplifier PWB Printed Wired Board PLL Phase Locked Loop RF Radio Frequency RX Receiver SA Spectrum analyzer TX Transmitter UHF Ultra High Frequency
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Introduction Two types of measurements have to be done for repair of the phone boards: • RF measurements shall be done using a Spectrum Analyzer together with a highfrequency probe. (Note, that signal will be significantly attenuated). Correct attenuation can be checked by using a “good” phone board, for example. • LF (Low frequency) and DC measurements shall be done with a an oscilloscope together with an 10:1 probe.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care RF key component placement Figure 17: RF key component placement Issue 2 09/2004 Copyright © 2004 Nokia Corporation Company Confidential Page 6-57
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Reference number Name Reference number Name N601 Mjoelner RF ASIC X602 RF Connector B601 26 MHz Xtal L801 Directional Coupler Z602 GSM1800 RX SAW V801 Detector Diode Z603 GSM1900 RX SAW Z601 Antenna switch Z604 EGSM RX SAW filter N801 Power Amplifier Z701 EGSM TX SAW filter T701 GSM1800/GSM1900 TX Balun V802 EGSM Pre-amplifier G701 3.
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions Measurement points in the receiver Measurement points are indicated on the picture below.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Measurement points in the transmitter Measurement points are shown in the picture below, Figure 21: Tx measurement points inside PA can (bottom side of PWB) Figure 22: Tx measurement points on the top side of PWB Page 6-60 Copyright © 2004 Nokia Corporation Company Confidential Issue 2 09/2004
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions Figure 23: Tx measurement points inside Mjoelner can Issue 2 09/2004 Copyright © 2004 Nokia Corporation Company Confidential Page 6-61
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care RF in General The RF part is a triple-band direct conversion transceiver. Using direct conversion no intermediate frequencies are used for up- or down- conversion. The VCO is set to either twice or four times (depending on the band used) the wanted RX or TX frequency. The VCO frequency is divided by either 2 or 4 and fed to the mixers (down-conversion) or modulators (up-conversion).
Ant Switch 3 RX1800 RX1900 INMM INPM INMH INPH INML INPL EGSM PWloop filter SAW VTX PCN/PCS Balun VPCH/VPCL DET PLFB1 PLFB2 OUTLP OUTLM OUTHP OUTHM VTXBL VTXBH VTXLOL VTXLOH VB_DET VANTL / VANTM / VANTH Buffer SAW SAW PA_IDENT VBATTRF DET Dir.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care RF Power Supply Configuration All power supplies for the RF Unit are generated in the UEM IC (D190). All RF supplies can be checked either in Mjoelner can or in BB can. The power supply configuration used is shown in the block diagram below. Values of voltages are given as nominal outputs of UEM. Currents are typical values. Figure 26: RF Power distribution diagram Charge Pump Supply : Vddcp(0.5mA) UEM VR1A (4.75V) (4.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Receiver General instructions for RX troubleshooting Connect the phone to a PC with DAU-9S cable and dongle and follow the following instructions: Measuring RX I/Q signals using RSSI reading Start Phoenix Service Software Log in with your user ID.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Apply a signal with a frequency of EGSM : 942.467 MHz (channel 37 + 67.710kHz offset) GSM1800: 1842.867 MHz (channel 700 + 67.710kHz offset) GSM1900: 1960.067 MHz (channel 661 + 67.710kHz offset) and a power level of -80dBm to the RF-connector (remember to compensate for cable attenuation). In RSSI reading click on Read now.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Wait until the RF Controls window pops up Select Select Band GSM 900 or GMS1800 or GSM1900 Active unit RX Operation mode Burst RX/TX Channel 37 or 700 or 661 Testing alt-S SNR Measurement N select Fast SNR Radio Button The setup should now look like this: Choose respective band (EGSM900, GSM1800, GSM1900).
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Press measure. A window pops up, e.g. for EGSM900 band: Connect an external signal generator to the RF connector of the phone and set the generator as told in the window, taking care for external cable losses. Press ok and the window closes. Read the SNR result.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Operation mode Continuous RX/TX Channel 37 or 700 or 661 Please refer to the fault finding chart for proper levels at different test points. Measuring analogue RX I/Q signal voltages using oscilloscope Measuring with an oscilloscope on “RXIINN” or “RXQINN” is recommended only if RSSI reading does not provide enough information. Use testpoints J606-J609.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Following picture should be seen on a working EGSM receiver: Signal amplitude 1.25V DC offset 1,35V Frequency 67kHz Receiver fault finding Set up Phoenix as if doing RSSI measurements. Ascertain which Rx band is faulty. Refer to Rx fault finding flow chart. Set signal generator frequency to 942.47MHz for EGSM, 1842.87MHz for DCS 1800 or 1960.07MHz for PCS 1900. Set signal generator amplitude to -60dBm.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Select Receive Band For Testing. Check RSSI using Phoenix. Does it match Sig. Gen Output level? YES NO NO Refer to Synth. Flow Chart. Is LO Running? YES Check Antenna Switch Cont. lines. Do they match the results in the table? YES Replace Antenna Switch Check SAW Output / Mjoelner Input for band.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Rx signal paths The signal paths of the receiver are shown in following block diagram. Note that the picture shows EGSM900 (EGSM) receiver (top), GSM1900 (PCS) receiver (middle) and GSM1800 (DCS/PCN) receiver (down).
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions The RX/TX switch with routed lines has following typical insertion losses: 1.3dB@EGSM900, 1.6dB@GSM1800 and 1.6dB@GFSM1900. Figure 27: Antenna switch Rx test points Front-end The RX front end includes three SAW filters (EGSM900 (Z604), GSM1800 (Z602), GSM1900 (Z603)). Each of the SAW filters is matched with a differential matching circuit (LC-type) to the corresponding LNA input of Mjoelner RF ASIC (N601).
NEM-4 Company Confidential 6 - Troublehsooting Instructions • Nokia Customer Care Two passive I/Q mixers (MIX), one for EGSM900 and one common for GSM1800 and GSM1900. The resulting BB signal is further amplified in the BB chain. For that no external circuitry is required: • Base band amplifiers (BBAMP1). That amplifiers implement the initial channel filtering. • Low pass filters (LPF1). • DC compensation / AGC amplifiers (DCN1). They implement gain steps from 0dB to 24dB in 6dB steps.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Transmitter General instructions for EGSM TX troubleshooting Apply a RF-cable to the RF-connector to allow the transmitted signal to act as normal. RF-cable should be connected to measurement equipment (GSM Test equipment, Powermeter, Spectrum Analyzer, or similar). Be sure to use at least a 10-dB attenuator, otherwise the results may be incorrect.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Page 6-76 Copyright © 2004 Nokia Corporation Company Confidential Nokia Customer Care Issue 2 09/2004
Nokia Customer Care Issue 2 09/2004 Company Confidential NEM-4 6 - Troublehsooting Instructions Copyright © 2004 Nokia Corporation Company Confidential Page 6-77
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Figure 28: Mjoelner Can Tx Test Points Page 6-78 Copyright © 2004 Nokia Corporation Company Confidential Issue 2 09/2004
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions TX Analog I & Q Data, C715 & C716 TXP & TXC Lines during Transmission TXP TXC Issue 2 09/2004 Copyright © 2004 Nokia Corporation Company Confidential Page 6-79
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care TXP / TXC Mask TXP Power Control Loop On TXC Baseband Generated Reference for EGSM Power Level 19 Figure 29: EGSM TX Can Test Points Page 6-80 Copyright © 2004 Nokia Corporation Company Confidential Issue 2 09/2004
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions VTXB_900 (EGSM V802 Pre-Amp Biasing Waveform) Only Biases V802 for duration of TX Pulse.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care EGSM Transmit Waveform (Continuous, Power Level 19) **Was drawing over 600mA during continuous operation** TX path of the transmitted EGSM900 signal For easy error tracing it is important to know the signal path of the EGSM900 transmitter. The components can be grouped into blocks and drawn as shown below. Note that the following picture shows both EGSM900 transmitter (bottom) and GSM1800/ GSM1900 transmitter (top).
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care VANTL / VANTM / VANTH VDDDIG 3 RF Controls VB_DET VTXLOL VTXLOH 1/4 1/2 VDDRXBB RF Controls VTXBH VTXBL GSM Dir.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care table shows the possible different states. CONT1 [Volt] CONT2 [Volt] CONT3 [Volt] EGSM Rx 0 0 0 X 0 0 0 0 0 2.7 0 2.7 0 2.
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions Antenna Control Line (CONT3) During EGSM EGSM Transmission AntennaSwitch Switch Control Line During Transmission Transmit Timing TXIOUTP TXC VTXB_900 Antenna Switch CONT 3 EGSM Tx fault finding flow chart THE FIRST FLOW DIAGRAM ASSUMES THE FOLLOWING: • Phoenix has been set up as shown on page 24 (the Tx power level may be increased using Phoenix if it makes the Tx pulse easier to see).
NEM-4 Company Confidential 6 - Troublehsooting Instructions • The VCO is running correctly. • The power amplifier is getting a correct VBATRF supply via L805 & L809. • Mjoelner’s supply voltages VR1A, VR2, VR3, VR4, VR5 & VR7 are all working correctly. Is Signal at TX_GSM on L801 OK? NO Change L801 YES Is EGSM TXIN signal at R805 OK? NO Is Signal at C733 OK? R R 806 NO Are TX I & Q on C715 & C716. OK? YES YES YES Probe VPD_900Signal on R818 and set Power Level to 19 using Phoenix.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care • Mjoelner’s supply voltages VR1A, VR2, VR3, VR4, VR5 & VR7 are all working correctly. Path of the transmitted GSM1800/1900 signal For easy error tracking it is important to know the signal path of the GSM1800/ GSM1900 transmitter. The components can be grouped into blocks and drawn as shown below. Note that the picture shows both EGSM transmitter (bottom) and GSM1800/ GSM1900 transmitter (top).
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care ply is coming directly from the Battery connectors. The output is controlled by the power control loop. From the output of the PA the signal goes through the directional coupler (one of the power control loop components) to the Antenna Switch. Antenna Switch The Antenna Switch works as a diplexer between RX and TX Bands. Moreover, it partly suppresses the harmonics generated by the PA.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Fault finding chart for GSM1800/GSM1900 transmitter Is signal at DCS / PCS Input of Z601 OK? YES YES Is signal on C823 OK? YES NO START Is TX Signal at DCS / PCS In on R819 OK? NO YES Is TX Signal at L705 OK? Is Vr2 2.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care This case is the same for EGSM, DCS1800 & DCS1900. YES NO Are R706, R707 & R708 OK? Replace Faulty Components Is DET Pulse on C805 OK? NO Is RF Signal at V801 OK? YES NO Replace L801 YES Replace V801 NO Check / Inspect End Action Is DET Pulse on C804 OK? YES Replace R802 Eunsure that VBD is pulsing 2.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care NEM-4 Synthesizer There is only one PLL synthesizer generating frequencies for both Rx and Tx for all three bands (EGSM900, GSM1800 and GSM1900). VCO frequency is divided by 2 or by 4 in Mjoelner depending on which band is active.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care The setup should now look like this: Since VCO chamber is completely shielded, it is not easy to measure frequency of 3769.6MHz at the output of the VCO (G701) using a resistive probe and a spectrum analyzer. It is possible to measure tuning voltage at charge pump output (C710) easily. For fVCO = 3769.6MHz the tuning voltage should be 2.3VDC .. 2.8VDC (Tuning sensitivity of VCO is 240MHz/V typ.).
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions Figure 31: PLL Synthesizer Test Points If this is not the case, then go to Fault finding chart in this document for Troubleshooting.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care 26 MHz reference oscillator (VCXO) The 26 MHz reference oscillator (VCXO) is part of Mjoelner RF-ASIC (N601). It needs only an external 26 MHz Xtal (B601) as external circuitry. The reference oscillator has three functions: • Reference frequency for the PLL synthesizer. • System clock for BB (RFCLK_I = 26 MHz). • 26 MHz Reference clock (LPRFCLK_I) for Bluetooth Module (N430) via buffer V601.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Fault finding chart for PLL synthesizer KEY Set up Phoenix RF Controls Band: GSM 900 Mode: RX Continuous Channel: 37 START Is LO@ 3.77 GHz YES Test with Spectrum Analyzer YES Check VCO Out. Is LO visible? NO Check VR7 VCO Side of R730. Vge OK? NO Replace G701 YES NO Check Mjoelner Voltage Supplies VR1A, VIO, VR3, VREF1. OK? Change Channel to 975. Does LO change frequency? YES NO YES Check T702 I/P.
2 2 To DCS/PCS Modulator 2 1/2 1/2 2 2 2 64/65 Ref. filter 2,7k VCXO Bias R2H/R2 RDIV NDIV ADIV Rpa Sensor BIST / Temp. PA vendor indication 3.
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions PLL power supply Issue 2 09/2004 Copyright © 2004 Nokia Corporation Company Confidential Page 6-97
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Loop filter VCO and power supply Page 6-98 Copyright © 2004 Nokia Corporation Company Confidential Issue 2 09/2004
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions 26MHz Bluetooth buffer Issue 2 09/2004 Copyright © 2004 Nokia Corporation Company Confidential Page 6-99
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Frequency lists EGSM900 CH T X RX VCO T X VCO RX CH T X RX VCO T X VCO RX 975 880.2 925.2 3520.8 3700.8 1 890.2 935.2 3560.8 3740.8 976 880.4 925.4 3521.6 3701.6 2 890.4 935.4 3561.6 3741.6 977 880.6 925.6 3522.4 3702.4 3 890.6 935.6 3562.4 3742.4 978 880.8 925.8 3523.2 3703.2 4 890.8 935.8 3563.2 3743.2 979 881.0 926.0 3524.0 3704.0 5 891.0 936.0 3564.0 3744.0 980 881.2 926.2 3524.8 3704.8 6 891.2 936.2 3564.8 3744.8 981 881.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care GSM1800 CH TX 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 1710.2 1710.4 1710.6 1710.8 1711.
NEM-4 Company Confidential 6 - Troublehsooting Instructions GSM1900 CH 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 TX 1850,2 1850,4 1850,6 1850,8 1851,0 1851,2 1851,4 1851,6 1851,8 18
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions Phoenix Tuning Before any tuning the phone should be synchronized with the PC. Connect the phone to a PC with DAU-9P cable and dongle and follow the following instructions: Provide the phone with power supply Start Phoenix Service Software and open FBUS connection Select File Scan Product Wait until phone information is shown in the lower right corner of the screen.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care A value (RF_TEMP), which represents the RF hardware temperature, is determined during RX Calibration. This temperature value is used by DSP to RSSI reporting in Normal mode of the phone. It is not visible in the calibration process. AGC-calibration: The AGC-calibration finds the gain values of the RX-gain system.
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions The setup should now look like this: Press Start and a window pops up: Connect an external signal generator to the RF connector of the phone and set the generator as told in the window, taking care for external cable losses. Press ok and the window closes.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care A typical result will look like this: Press Save and Continue. RX Calibration for EGSM is finished and the tuning continues automatically with GSM1800.
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions GSM1800 (DCS/PCN) Set the generator as instructed and press OK. A typical result will look like this: Press Save and Continue. RX Calibration for GSM1800 is finished and the tuning continues automatically with GSM 1900.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care GSM1900 (PCS) Set the generator as instructed and press OK. A typical result will look like this: Press Save and Continue. RX Calibration is finished and the tuning is fully completed. RX AGC limits The Rx calibration is only valid if it is within certain limits. For the most recent limits see NEM-4 Production Testing Requirements, If calibration is not within limits, there is a fault in the RX chain.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Below the values for RSSI4 and RSSI7 are given: RSSI4:(Rx A5) band min typ max EGSM900 81 86 91 GSM1800 79 84 89 GSM1900 79 85 89 RSSI7:(Rx A8) band min typ max EGSM900 103 108 113 GSM1800 99 105 109 GSM1900 100 104 110 RX band filter response compensation RX Band Filter Response Compensation needs to be done on all three bands.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care The setup should now look like this: Manual tuning EGSM900 Select Manual Tuning mode. Press Start. A window pops up: Connect an external signal generator to the RF connector of the phone and set the generator as told in the window.
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions Press OK and a new window pops up: Set the generator as told in the window. Press OK and a new window pops up. Repeat this sequence 9 times until all channels have been tuned. Press Save and Continue. RX Band Filter Response Compensation for EGSM is finished and the tuning continues automatically with GSM1800. GSM1800 (DCS/PCN) Band Filter Response Compensation has to be done first for EGSM band (see previous chapter).
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care GSM1900 (PCS) Band Filter Response Compensation has to be done first for EGSM and GSM1800 bands (see previous chapters). After the other bands have been tuned, the tuning continues automatically with GSM1900 and the following window should be seen: Set the generator as instructed and press OK. Repeat this sequence 9 times until all channels have been tuned. Press Save and Continue.
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions Auto tuning A faster and more convenient method for Band Filter Calibration can be performed by clicking on "Auto Tuning". This requires a signal Generator that can be programmed to sweep a user defined list of frequencies. EGSM900 Select Automatic Tuning mode. Press start and then Tune.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care GSM1800 (DCS/PCN) Band Filter Response Compensation has to be done first for EGSM band (see previous chapter). After tuning the EGSM band, the tuning continues automatically with GSM1800 and the following window should be seen: Set the generator to sweep the frequency list as instructed and press OK. Press Save and Continue.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care GSM1900 (PCS) Band Filter Response Compensation has to be done first for EGSM and GSM1800 bands (see previous chapters). After tuning the other bands have been tuned, the tuning continues automatically with GSM1900 and the following window should be seen: Set the generator to sweep the frequency list as instructed and press OK. Press Save and Continue.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care The setup should now look like this: Press Tune. Press Stop. Channel select filter calibration is finished and the tuning is fully completed.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care TX power tuning This tuning must be done in all three bands. Note: TX Power tuning must be done with a peak power meter, e.g. Anritsu model ML2408A with Anritsu Peak Power Sensor MA2442A and a suitable attenuator. The use of a spectrum analyser or the power meter in GSM testers is likely to cause larger error than the use of a dedicated power meter and might cause the phone to be noncompliant with GSM specifications.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care EGSM900 (EGSM) If a spectrum analyser is used, follow the instruction window. Press OK to continue. From the main toolbar, select TX Data Type Random and TX PA Mode High. Tune the power levels according to the table below by adjusting the corresponding coefficient values. The levels mentioned in the table below differ to some extent from the target values mentioned in Phoenix, since they are product specific.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care GSM1900(PCS) Change the center frequency of the spectrum analyzer as instructed in the Spectrum Analyzer Settings window and press OK. From the main toolbar, select TX Data Type Random and TX PA Mode High. Tune the power levels according to the table below by adjusting coefficient values. The levels below differ to some extent from the target values in Phoenix, since they are product specific.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care Set the spectrum analyzer according to the instruction window and press OK. TX IQ tuning procedure begins from EGSM900, and continues automatically to GSM1800 (PCS/ PCN) and GSM1900 (PCS). EGSM900 (EGSM) If a spectrum analyzer is used then use the following settings. EGSM/EGSM900 Center Frequency 897.4 MHz Frequency Span 200/300 kHz Resolution Bandwidth 3kHz Video Bandwidth 3kHz Sweep Time 3 sec.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Select Active Unit TX Operation Mode Burst RX/TX Channel 37 TX PA Mode Free TX Data Type All1 Testing [Alt-S] RF Controls [R] Wait until the RF Controls window pops up. Choose TX Power Level 5. The spectrum analyzer shows now a plot like this: Marker 1 [T1] RBW 3 kHz Ref Lvl 33.35 dBm VBW 3 kHz 35 dBm 897.33229000 MHz 1 SWT 3 s 35 27.5 dB Offset RF Att Unit 1 [T1] 30 dB dBm 33.35 dBm 30 A 897.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care and 2 must exceed 40dB. Tuning is possible by using arrow keys on the keyboard. Pushing the sliders by using the mouse is less sensitive but even possible.
Nokia Customer Care Company Confidential NEM-4 6 - Troublehsooting Instructions The Spectrum Analyzer now shows a plot like this: Marker 1 [T1] RBW 3 kHz Ref Lvl 33.65 dBm VBW 3 kHz 35 dBm 897.33229000 MHz 1 SWT 3 s 35 27.5 dB Offset RF Att Unit 1 [T1] 30 dB dBm 33.65 dBm 30 A 897.33229000 MHz 2 [T1] 20 -19.54 dBm 897.40000000 MHz 3 [T1] -10.79 dBm 897.46771000 MHz 10 1MA 0 3 -10 2 -20 -30 -40 -50 -60 -65 Center 897.4 MHz Date: 14.JAN.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care The Spectrum Analyzer now shows a plot like this: RBW 3 kHz Ref Lvl 33.40 dBm VBW 3 kHz 35 dBm 897.33229000 MHz 1 SWT 3 s Marker 1 [T1] 35 27.5 dB Offset RF Att Unit 1 [T1] 30 dB dBm 33.40 dBm 30 A 897.33229000 MHz 2 [T1] 20 -20.35 dBm 897.40000000 MHz 3 [T1] -27.60 dBm 897.46771000 MHz 10 1MA 0 -10 2 -20 3 -30 -40 -50 -60 -65 Center 897.4 MHz Date: 14.JAN.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care GSM1800 (DCS/PCN) If a spectrum analyzer is used then use the following settings. GSM1800 Center Frequency 1747.8MHz Frequency Span 200/300 kHz Resolution Bandwidth 3 kHz Video Bandwidth 3 kHz Sweep Time 3 sec. Sweep Type Clear/Write Detector Type Max Peak Reference level 35 dBm Marker 1 1747.73229 MHz Marker 2 1747.8 MHz Marker 3 1747.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care The Spectrum Analyzer now shows a plot like this: RBW 3 kHz Ref Lvl -10.57 dBm VBW 3 kHz 35 dBm 1.74786771 GHz SWT 3 s Marker 3 [T1] RF Att Unit 30 dB dBm 35 27.5 dB Offset 3 [T1] -10.57 dBm 30 A 1.74786771 GHz 1 1 [T1] 20 24.34 dBm 1.74773229 GHz 2 [T1] -2.92 dBm 1.74780000 GHz 10 0 1MA 2 3 -10 -20 -30 -40 -50 -60 -65 Center 1.7478 GHz Date: 15.JAN.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care The Spectrum Analyzer now shows a plot like this: Marker 3 [T1] RBW 3 kHz Ref Lvl -12.03 dBm VBW 3 kHz 35 dBm 1.74786771 GHz SWT 3 s RF Att Unit 30 dB dBm 35 27.5 dB Offset 3 [T1] -12.03 dBm 30 A 1.74786771 GHz 1 1 [T1] 20 22.52 dBm 1.74773229 GHz 2 [T1] -21.44 dBm 1.74780000 GHz 10 1MA 0 3 -10 2 -20 -30 -40 -50 -60 -65 Center 1.7478 GHz Date: 15.JAN.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care The Spectrum Analyzer now shows a plot like this: RBW 3 kHz Ref Lvl -28.50 dBm VBW 3 kHz 35 dBm 1.74786771 GHz SWT 3 s Marker 3 [T1] RF Att Unit 30 dB dBm 35 27.5 dB Offset 3 [T1] -28.50 dBm 30 A 1.74786771 GHz 1 1 [T1] 20 23.48 dBm 1.74773229 GHz 2 [T1] -22.69 dBm 1.74780000 GHz 10 1MA 0 -10 2 -20 3 -30 -40 -50 -60 -65 Center 1.7478 GHz Date: 15.JAN.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care GSM1900 (PCS) If a spectrum analyzer is used then use the following settings. GSM1900 Center Frequency 1880MHz Frequency Span 200/300 kHz Resolution Bandwidth 3 kHz Video Bandwidth 3 kHz Sweep Time 3 sek. Sweep Type Clear/Write Detector Type Max Peak Reference level 35 dBm Marker 1 1879.93229 MHz Marker 2 1880 MHz Marker 3 1880.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care The Spectrum Analyzer now shows a plot like this: RBW 3 kHz Ref Lvl -12.20 dBm VBW 3 kHz 35 dBm 1.88006771 GHz SWT 3 s Marker 3 [T1] RF Att Unit 30 dB dBm 35 27.5 dB Offset 3 [T1] 1 30 -12.20 dBm A 1.88006771 GHz 1 [T1] 20 27.81 dBm 1.87993229 GHz 2 [T1] 4.13 dBm 1.88000000 GHz 10 2 1MA 0 3 -10 -20 -30 -40 -50 -60 -65 Center 1.88 GHz Date: 15.JAN.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care The Spectrum Analyzer now shows a plot like this: Marker 3 [T1] RBW 3 kHz Ref Lvl -15.03 dBm VBW 3 kHz 35 dBm 1.88006771 GHz SWT 3 s RF Att Unit 30 dB dBm 35 27.5 dB Offset 3 [T1] -15.03 dBm 30 1 A 1.88006771 GHz 1 [T1] 20 25.16 dBm 1.87993229 GHz 2 [T1] -23.51 dBm 1.88000000 GHz 10 1MA 0 -10 3 -20 2 -30 -40 -50 -60 -65 Center 1.88 GHz Date: 15.JAN.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care The Spectrum Analyzer now shows a plot like this: Marker 3 [T1] RBW 3 kHz Ref Lvl -27.22 dBm VBW 3 kHz 35 dBm 1.88006771 GHz SWT 3 s RF Att Unit 30 dB dBm 35 27.5 dB Offset 30 3 [T1] 1 -27.22 dBm A 1.88006771 GHz 1 [T1] 20 25.76 dBm 1.87993229 GHz 2 [T1] -27.30 dBm 1.88000000 GHz 10 1MA 0 -10 -20 2 3 -30 -40 -50 -60 -65 Center 1.88 GHz Date: 15.JAN.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Bluetooth troubleshooting CBUS CBUS is a three wire serial interface between the main baseband components. The bus consists of data, clock and bus_enable signals. In NEM-4 the bus is connected from UPP WD2 to ZOCUS, UEM and LPRF. UPP_WD2 takes care of controlling the traffic on the bus. If the interface is faulty from the UPP WD2's end the phone won't boot properly as powering configurations don't work.
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care ST_UEM_CBUS_IF_TEST to test UEM Cbus interface ST_LPRF_IF_TEST to test Bluetooth Cbus interface If an error is found testing any of the above components you should replace the failing component. FBUS FBUS is a two wire RX and TX interface between UPP and flash/test interface. The bus goes through UEM which adjusts the voltage levels to suit UPP_WD2. The interface voltage level on the phone flash/test pad pattern is 2.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care Bluetooth troubleshooting diagrams BT Failure Part I (Flashing problems) Attempt to re-flash the phone Do you have any FPS-8 errors? Yes No No NEM-4 Go to Calypso's 'Flashing' Troubleshooting Section Does the phone's main SW flash correctly? Yes Does the BT SW flash correctly? No 1) Replace BT MCM 2) Attempt to Flash Phone Yes BT Flashing OK! Issue 2 09/2004 Copyright © 2004 Nokia Corporation Company Confidential
NEM-4 Company Confidential 6 - Troublehsooting Instructions Nokia Customer Care BT Failure Part II (BER Failure) Test Pogo-Pin connection to BT Check antenna R430 with multimeter connection to antenna YES Are the Pogo- Pins electrically Visually check connected to BT antenna BT antenna No (i.e. short circuit)? Replace BT antenna (i.e.
Company Confidential NEM-4 6 - Troublehsooting Instructions Nokia Customer Care BT Failure Part III (BER Failure) Check VCC (Pins 52, 53, 54) with O-scope Does VCC = 2.95 - 5.2 VDC? No Check L431/ / VBAT / L430 C431 Yes No Does Ripple Voltage < = 400mVpp? Yes Check VREG (Pin 6) with O-scope Check SYSCLCK (Pin 50 ) with O-scope Does VREG = 2.9VDC? 2.7 - 3.
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