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Nokia NPM-2NX Troubleshooting Manual
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Nokia NPM-2NX Troubleshooting Manual

Nokia NPM-2NX Troubleshooting Manual

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CCS Technical Documentation
NPM-2NX Series Transceivers
Troubleshooting
ãNokia Corporation
Issue 1 07/02

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Summary of Contents for Nokia NPM-2NX

  • Page 1 CCS Technical Documentation NPM-2NX Series Transceivers Troubleshooting ãNokia Corporation Issue 1 07/02...

  • Page 2: Table Of Contents

    NPM-2NX Troubleshooting CCS Technical Documentation Contents Page No Transceiver Troubleshooting ..................4 General about testing ....................4 Phone operating modes ..................... 4 Measurement points .....................5 Baseband Troubleshooting..................... 7 Power up sequence ......................7 Phone does not start up normally or does not stay on..........10 Flash Programming does not work................
  • Page 3 TX VHF VCO ......................58 Fault finding chart for TX VHF VCO..............58 UHF SYNTHESIZER ....................59 Fault finding chart for UHF SYNTHESIZER............60 Description of NPM-2NX RF Auto-tune Tuning ............61 TDMA RF tunings .....................61 TDMA RX tunings....................61 TDMA TX tunings ....................62 GSM RF tunings ......................64...

  • Page 4: Transceiver Troubleshooting

    NPM-2NX Troubleshooting CCS Technical Documentation Transceiver Troubleshooting General about testing Phone operating modes Phone has three different modes for testing/repairing phone. Modes can be selected with suitable resistors connected to BSI- and BTEMP- lines as following: Table 1: Mode selection resistors...

  • Page 5: Measurement Points

    NPM-2NX CCS Technical Documentation Troubleshooting Measurement points Figure 1: UEM regulator's filter capacitors VR1B VR1A VCORE VFLASH VFLASH VANA VSIM Issue 1 07/02 ãNokia Corporation Page 5...

  • Page 6: Fig 2 Bb Testpoints

    NPM-2NX Troubleshooting CCS Technical Documentation Figure 2: BB testpoints RFCLK: Init clk 19.22MHz FLASH GSM 13MHz TDMA Page 6 ãNokia Corporation Issue 1 07/02...

  • Page 7: Baseband Troubleshooting

    NPM-2NX CCS Technical Documentation Troubleshooting Baseband Troubleshooting Note: ESN and IMEI has to re-written to phone If UEM is replaced. This can be done only in Central Service. The Baseband Troubleshooting instructions consists of the following topics: • Power up •...
  • Page 8 NPM-2NX Troubleshooting CCS Technical Documentation •Hw "core" regulators "on": Vio, Vcore, VR3, Vflash1 •These regulators are supplying the processors, memory, chip interfaces and clock source in RF • Reset releasing delay •Supply voltages stabilize to their UEM hw default values •RFCLK grows to full swing...

  • Page 9: Fig 3 Power Up Sequence

    NPM-2NX CCS Technical Documentation Troubleshooting Figure 3: Power up sequence 1 Power key pressed • After 20ms UEM enters RESET MODE if VBAT>Vmstr+ 2 2) VFLASH1, Vana, Vcore, Vio and VR3 goes high. • VCTCXO enabled by VR3 -> RFClk 19.2 MHz running.

  • Page 10: Phone Does Not Start Up Normally Or Does Not Stay On

    NPM-2NX Troubleshooting CCS Technical Documentation Phone does not start up normally or does not stay on Note! In case of power up faults, it's not possible to force phone on by disabling watch- dog. Instead, measurements should be done immediately when power key pressed or when battery voltage connected to phone (local/test mode).

  • Page 11: Flash Programming Does Not Work

    NPM-2NX CCS Technical Documentation Troubleshooting Figure 4: Fault tree, phone does not power up Check the Try to start phone to power key test or local mode FAIL Check R202, Measure R203, R205, Vflash1,Vana,Vio,Vcore C217, C220 FAIL ,VR3 when pwr key...
  • Page 12 NPM-2NX Troubleshooting CCS Technical Documentation •FBUSTX(serial data to phone), •FBUSRX(serial data from phone), •MBUS(serial clock for FBUSRX) •VPP(External flashing voltage for speed up flashing) • Also BSI line is used when initializing flashing(battery connector) • When phone is powered(VBAT>3V ) MBUS and FBUSTX lines are pulled up inter- nally by phone.

  • Page 13: Flash Programming Error Codes

    NPM-2NX CCS Technical Documentation Troubleshooting Flash programming error codes Error codes can be seen from "FPS-8 Flash" in Phoenix. Underlined note means that item under consideration is being used first time in flashing sequence. Table 2: Flash programming error codes...
  • Page 14 NPM-2NX Troubleshooting CCS Technical Documentation C384 "The Phone has generated NAK signal during data Flash C584 block transfer." C684 (C384-during algorithm download to target phone) Signals between UPP-Flash (C584-during erasing) (C684-during programming) C585 Data block handling timeout" Flash C685 (C585-during erasing)

  • Page 15: Charging

    NPM-2NX CCS Technical Documentation Troubleshooting Charging Note: Charging voltage and current can be checked by connecting phone to service software and reading ad- converter values of vchar and ichar. Figure 5: Fault tree, charging Phone doesn't start charging Connect charger and...
  • Page 16 NPM-2NX Troubleshooting CCS Technical Documentation 3 In case of internal microphone/XEAR fail: Feed tone to microphone and measure signal from XEAR line. Audio test box JBA-8 is needed. Audio loop (Audio test/Hp In Ext Out) must be switched on by Phoenix service software. This loop will con- nect audios only through UEM.

  • Page 17: Earpiece Or External Microphone Line Does Not Work

    NPM-2NX CCS Technical Documentation Troubleshooting Earpiece or external microphone line does not work Figure 6: Fault tree, earpiece fail 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,L152,...

  • Page 18: Microphone Or Xear Line Does Not Work

    NPM-2NX Troubleshooting CCS Technical Documentation .Microphone or XEAR line does not work Figure 7: Fault tree, microphone fail Microphone doesn't work Feed 1KHz to Mic Run audio-loop Fail and measure from selftest with Xear by JBA-8 phoenix Fail Check C151,C152,C157,L151,C162,...

  • Page 19: Accessory Detection

    NPM-2NX CCS Technical Documentation Troubleshooting Accessory detection • - Start phone to normal mode when checking accessory detection. • - Ad- converter value of headint and hookint - lines can be checked with Phoenix ADC-reading. • - When headset HDC-9 connected and headset push button is held down, head- int- value should be between 10 and 50 and hookint- value between 0-30.

  • Page 20: Power Supply For Data Cable

    NPM-2NX Troubleshooting CCS Technical Documentation Power supply for data cable DLR-3 needs power supply for data transfering. SGND will supply 2.8V to DLR-3. - Start phone to normal mode when checking DLR-3 detection Figure 9: Fault tree, data cable. DLR-3 data cable...

  • Page 21: Fig 10 Fault Tree, Sleep Clock

    NPM-2NX CCS Technical Documentation Troubleshooting • Phone clock (on display) does not function properly Figure 10: Fault tree, sleep clock Sleep mode not working Fail Fail Check C203 Measure sleep clock Measure sleep clock from B200 &C204 from J404 Change UPP...

  • Page 22: Display/Keyboard Lights Do Not Work

    NPM-2NX Troubleshooting CCS Technical Documentation Display/Keyboard lights do not work Fault tree, Display/Keyboard lights Figure 11: Display/Keyboard lights are not working Check R300 (Display) and Replace FAIL R301 (Keyboard) resistor(s) Check LEDs V300...V303,V310-V311 Replace FAIL (Display) and V304...V309 LED(s) (Keyboard)

  • Page 23: Display Does Not Work

    NPM-2NX CCS Technical Documentation Troubleshooting Display does not work Figure 12: Fault tree, display Display does not work In any phase of display troubleshooting use Display Test in Phoenix to produce test patterns on display. Check that phone Proceed to phone...

  • Page 24: Vibra Does Not Work

    NPM-2NX Troubleshooting CCS Technical Documentation No sound: Try using known good buzzer instead. If still no sound ->change UEM(D200) Weak sound: Use Audio test in Phoenix to set buzzer parameters(frequency, strength). If it doesn't effect to the sound level ->change buzzer.

  • Page 25: Infrared Does Not Work

    NPM-2NX CCS Technical Documentation Troubleshooting Infrared does not work Fault tree, infra red Figure 13: Infra Red not working Measure Vflash1 from IR Change FAIL module VCC(pin6), should UEM(D200) be 2.78V Replace faulty Check R350, R351, C351 FAIL component(s) and V350...

  • Page 26: Rf Troubleshooting

    NPM-2NX Troubleshooting CCS Technical Documentation RF Troubleshooting Introduction Measurements should be done using spectrum analyzer and high-frequency probe (Local and reference frequencies and RF-power levels in intermediate stages of chain). Oscillo- scope is used to measure DC-voltages and low frequency signals. Multimeter is also use- ful measurement equipment in faultfinding.

  • Page 27: Receiver

    NPM-2NX CCS Technical Documentation Troubleshooting PWRDET Power detector module Phase Locked Loop Radio Frequency Receiver Time between pulses Transmitter Up converter (mixer and driver in same package) Ultra High Frequency Voltage of signal (measured with oscilloscope) Voltage controlled oscillator Very High Frequency...

  • Page 28: Path Of The Received Signal

    NPM-2NX Troubleshooting CCS Technical Documentation Path of the received signal Block level description of the receiver: Diplex filter 1930 ... 1990 MHz 869 ... 894 MHz 850 / 1900 Duplex filter Duplex filter 1900 MHz 850 MHz SAFARI GTE AGC 25/20 dB 1 step...

  • Page 29: Amps

    NPM-2NX CCS Technical Documentation Troubleshooting AMPS Fault finding chart Apply signal to ext . antenna connector f= 881.4 MHz ch 380) mod.= 1004 dev .= 8 kHz level= -116 dBm Connect audio box SINAD > 12 dB from the bottom...
  • Page 30 NPM-2NX Troubleshooting CCS Technical Documentation Step 1. General checking Check VR4 supply Check signal level Not OK and components if at RX band filter these ok => replace Z801 input Safari N801 Not OK Check signal level Replace RX band...
  • Page 31 NPM-2NX CCS Technical Documentation Troubleshooting Audio test Please use Phoenix RF-control to set phone to the correct operating mode. Enable audio using Phoenix software (maintenance -> testing -> audio test mode -> set audio test mode). See picture below. Step 2. Local oscillator checking Carrying out this step VCO signal of 1st and 2nd mixers can be checked.
  • Page 32 NPM-2NX Troubleshooting CCS Technical Documentation 2) Set phone to TDMA mode and select RF Test UI in Phoenix (Maintenance => Testing => RF Test). 3) Make sure that signal generator allows phone TX power going to its output. Use low power level, for example 10.

  • Page 33: Tdma800

    NPM-2NX CCS Technical Documentation Troubleshooting power level, for example 10. Set channel to 380 and press "Write Init". 4) Connect oscilloscope probe to one of the RX I/Q test points on PWB (all four testpoints J808, J809, J818 and J819 are located behind display) 5) Check that there is a clean signal in each test points.
  • Page 34 NPM-2NX Troubleshooting CCS Technical Documentation Fault finding chart A pply signal to ext. antenna connector f= 1960.029 MH z (ch 1000) unmodulated level= -50 dB m C heck signal level T D MA 1900 R X is at R X I/Q J808,...
  • Page 35 NPM-2NX CCS Technical Documentation Troubleshooting Check components Check signal level Not OK around lna and at RX band filter measure supply Z802 input voltages Not OK Check signal level Replace RX band filter Z802 at mix1_B input, L810 Continue troubleshooting as AMPS/TDMA800 Step 1.

  • Page 36: Gsm1900

    NPM-2NX Troubleshooting CCS Technical Documentation => RF Test). 3) Set channel to 1000 and press "Write Init". 4) Set spectrum analyzer settings as following: - Center frequency: 268.08 MHz, Span: 200 kHz - RBW: 3 kHz, reference level: 0 dBm 5) Connect spectrum analyzer probe on the inductor L818 and record RX VHF VCO signal level and frequency.
  • Page 37 NPM-2NX CCS Technical Documentation Troubleshooting Apply signal to ext . antenna connector f= 1960.06771 ( ch 661) unmodulate level= -83 dBm Check signal level GSM1900 RX is at RX I/Q J808, J809, J818, J819 STEP 3. Not OK According STEP 4.
  • Page 38 NPM-2NX Troubleshooting CCS Technical Documentation Check components Check signal level Not OK around lna and at RX band filter measure supply Z802 input voltages Not OK Check signal level Replace RX band filter Z802 at mix1_B input, L810 Check signal level...
  • Page 39 NPM-2NX CCS Technical Documentation Troubleshooting If the cable losses are calibrated correctly the RSSI reading should give reasonable result (-80 dBm +/- 2 dB). Please note that RSSI result is valid only if there has not been RX calibration attempts for the faulty phone. If the RSSI level is several dB's lower go to Step 2 (Local oscillator checking).
  • Page 40 NPM-2NX Troubleshooting CCS Technical Documentation level and frequency. The result should be like in the picture below: 2) Set spectrum analyzer settings as following: - Center frequency: 266.4 MHz, Span: 200 kHz - RBW: 3 kHz, reference level: 0 dBm 3) Connect spectrum analyzer probe on the inductor L818 and record RX VHF VCO signal level and frequency.
  • Page 41 NPM-2NX CCS Technical Documentation Troubleshooting - RBW: 3 kHz, reference level: 10 dBm 6) Connect spectrum analyzer probe to testpoint J813 and record UHF VCO signal level and frequency. The result should be like in the picture below: 7) Repeat measurement for channels 512 and 810.
  • Page 42 NPM-2NX Troubleshooting CCS Technical Documentation 3) Connect oscilloscope probe to one of the RX I/Q test points on PWB (all four testpoints J808, J809, J818 and J819 are located behind display) 4) Measure frequency and peak-to-peak voltage of RX I/Q signal from each test points.
  • Page 43 NPM-2NX CCS Technical Documentation Troubleshooting - Center frequency: 133.2 MHz, Span: 200 kHz - RBW: 3 kHz, reference level: -20 dBm 3) Set phone receiver to continuous mode with the following gain settings using Phoenix (see picture of controls in step 3).

  • Page 44: Transmitter

    NPM-2NX Troubleshooting CCS Technical Documentation Transmitter General instructions for TX troubleshooting Always use an RF-cable connected from an external RF-connector to analyzer via (rf- power) attenuator. This is important to protect analyzer against excessive RF-power and not allow leakage of undesired RF-power into RF-power into cellular frequencies.

  • Page 45: Fault Finding Charts For Transmitter

    NPM-2NX CCS Technical Documentation Troubleshooting guide. 1900 VHF-PLL 356.4 MHz UHF-PLL 2G (÷2) 358.08 MHz (2063.4-2124 MHz, HB) 426.4 MHz (1003.08-1028.01 MHz,LB) 428.16 MHz 1900MHz 213.2 MHz 1900MHz 214.08 MHz 800MHz 800MHz 178.2 MHz 179.04 MHz Safari GTE Fault finding charts for transmitter AMPS Start Phoenix-software and set phone to the Analog mode.
  • Page 46 NPM-2NX Troubleshooting CCS Technical Documentation Page 46 ãNokia Corporation Issue 1 07/02...
  • Page 47 NPM-2NX CCS Technical Documentation Troubleshooting AMPS, PL2, CH383 Visual check of TX block - PA and up converter -TX SAW - Duplex filter - Passive components Check LO-signal (1015.53MHz) Start synth @L979&L980 troubleshooting and TX VHF (358.08 MHz)@N811 Check supply voltages:...

  • Page 48: Tdma800

    NPM-2NX Troubleshooting CCS Technical Documentation Check TX SAW Change TX SAW filter input and output power Z905 IL: 3 dB Is Itot 850 ... 1000 mA? Check PA output power and gain. Change PA N901 Output power: ~28 dBm Gain: ~30 dB...
  • Page 49 NPM-2NX CCS Technical Documentation Troubleshooting TDMA1900: GSM1900: Issue 1 07/02 ãNokia Corporation Page 49...
  • Page 50 NPM-2NX Troubleshooting CCS Technical Documentation TDMA1900, PL2, CH1000 GSM1900, PL0, CH661 Is TDMA800 mode Start AMPS troubleshooting Check LO-signal (TDMA 2094.06 GSM Start synth 2093.2MHz)@L979&L98 troubleshooting 0 and TX VHF (TDMA 428.16 GSM 426.4 MHz)@N811 Check supply voltages: VR2,VBATTRF, Check UEM and UPP...

  • Page 51: Power Control Loop

    NPM-2NX CCS Technical Documentation Troubleshooting Is Itot TDMA 350...500 GSM 200 ... 300 mA? Check PA output power Change PA N901 and gain. Gain: ~30 dB Pout: TDMA ~29 dBm GSM ~32 dBm Check PWRDET N900 Change PWRDET insertion loss N900 IL<...

  • Page 52: Amps And Tdma

    NPM-2NX Troubleshooting CCS Technical Documentation own coupler. Note ! Check VR2 and Is TXPWRDET vs. PATEMP . See TXPWRDET vs. Output output power OK? Check C921, C922 power curve See chart below. and PWRDET module. Is DAC value vs. Check UEM...

  • Page 53: Gsm1900

    NPM-2NX CCS Technical Documentation Troubleshooting GSM1900 Table 4: Typical detected voltages at power levels PL0...PL15 1900 TXPWRDET, Pout TXPWRDET Pout U_value 29.5 Note: DAC VALUES MAY VARY ABOUT +/- 20% Note: TXPWRDET is difference between TX on burst and off burst.

  • Page 54: Synthesizers

    NPM-2NX Troubleshooting CCS Technical Documentation Synthesizers There are five oscillators generating the needed frequencies for RF-section. 19.2 MHz reference oscillator, 2GHz UHF VCO, TX VHF cascade amplifier VCO both RX VHF VCO and BB VHF integrated in Safari. RX VHF frequency is 268.08 MHz in TDMA and 266.4 MHz in GSM and TX VHF has three fixed frequencies, 358.08 MHz for lowband and 426.4 MHz in...

  • Page 55: Fault Finding Chart For 19.2 Mhz Oscillator

    NPM-2NX CCS Technical Documentation Troubleshooting Fault finding chart for 19.2 MHz oscillator START HERE! Is VCTCXO Change oscillating? VCTCXO 2.No 19.2MHz 1.No Check voltage C867 2.78 V Check resistor R816 RX VHF VCO The RX VHF VCO signal is used to generate receiver Intermediate frequency. RX VHF VCO has two fixed frequencies: TDMA 268.08 MHz, GSM 266.4 MHz.

  • Page 56: Bb Pll

    NPM-2NX Troubleshooting CCS Technical Documentation Change SAFARI Check loopifilter 1 START HERE components: Is oscillator locked to TDMA 268.08 C848, R808, C847, 3.No or GSM 266.4 R807, C846, R820, C870 check also R826 2.No Check resonator components: V801, C845, C871,...

  • Page 57: Fault Finding Chart For Bb Pll

    NPM-2NX CCS Technical Documentation Troubleshooting TDMA mode and 78 MHz in GSM mode. Next picture shows BB PLL working. 19.2 MHz VCTCXO Divider Freq/Phase Charge Pump Loop Filter 65 or 80 comparator Varactor Active Divider Resonator part * Data 324 or 325...

  • Page 58: Tx Vhf Vco

    NPM-2NX Troubleshooting CCS Technical Documentation GSM-> BB PLL frequency 78 MHz Change SAFARI Check loopfilter 1 START HERE components: Is oscillator locked to TDMA 77.76 or 3.No C878, R834, C881, R835, GSM 78 MHz C882 2.No Check resonator components: V805, C871,...

  • Page 59: Uhf Synthesizer

    NPM-2NX CCS Technical Documentation Troubleshooting GSM1900, CH661 -> TX VHF frequency 426.4 MHz Check components: Change C853, C852, C851, cascade amplifier R810, R809, R821 and N811 C841, C873, L828 6.No 5.No OK Change SAFARI 4.No START HERE Is oscillator locked Check resonator to 358.08, 426.4...

  • Page 60: Fault Finding Chart For Uhf Synthesizer

    NPM-2NX Troubleshooting CCS Technical Documentation Fault finding chart for UHF SYNTHESIZER Change VCO G802 Change SAFARI N801 4. No START HERE! 2. No Is frequency locked? Is EVM OK? 2006.16 - 2124 band Check loopfilter components and balun T801, Check...

  • Page 61: Description Of Npm-2Nx Rf Auto-Tune Tuning

    NPM-2NX CCS Technical Documentation Troubleshooting Description of NPM-2NX RF Auto-tune Tuning TDMA RF tunings TDMA RX tunings AFC tuning • Purpose of the tuning is to correct phone frequency error • If AFC tuning fails it might be due to: •...

  • Page 62: Tdma Tx Tunings

    NPM-2NX Troubleshooting CCS Technical Documentation • Tuning results are only visible after unsuccessful tuning with auto-tune proce- dure • This tuning has done simultanously with AFC-tuning If LP and AMP2 filter tuníngs fail it might be due to: • Problems with lower band signal path (synthetizer etc.) •...
  • Page 63 NPM-2NX CCS Technical Documentation Troubleshooting • Purpose of the tuning is to tune DC offset and phase offset so low as possible (test limit –40 dBc) If tuning fails there can be following problems: • UEM or Safari • Too low output power TX power levels and crossband (TxPwr) •...

  • Page 64: Gsm Rf Tunings

    NPM-2NX Troubleshooting CCS Technical Documentation GSM RF tunings GSM RX tunings LP and AMP2 filters tunings • This is done using Safari internal loop. No external signal is needed If it fails there can be following problems: • Safari problem GSM AFC tuning •...
  • Page 65 NPM-2NX CCS Technical Documentation Troubleshooting GSM UB LNA GAIN AND RSSI OFFSET • UB GSM reference gain (around 74 dB), measured when lna is switched off • UB LNA gain step, measured when lna is switched on. Result is gain difference...

  • Page 66: Gsm Tx Tunings

    NPM-2NX Troubleshooting CCS Technical Documentation GSM TX tunings If some TX tuning fails, start always TX troubleshooting! TX IQ • Purpose of this tuning is tune DC offset and phase offset so low as possible •Typical values Amplitude: -45 to –55 dBc and Phase: –50 to – 60 dBc If tuning fails there can be following problems: •...

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