Nokia NPM-10 Series Troubleshooting Instructions
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Nokia NPM-10 Series Troubleshooting Instructions

Nokia NPM-10 Series Troubleshooting Instructions

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CCS Technical Documentation
NPM-10 Series Transceivers
Troubleshooting Instructions RF
Nokia Corporation
Issue 1 03/2003
Confidential

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  • Page 1 CCS Technical Documentation NPM-10 Series Transceivers Troubleshooting Instructions RF Nokia Corporation Issue 1 03/2003 Confidential...
  • Page 2 NPM-10 Troubleshooting Instructions RF CCS Technical Documentation Nokia Corporation Page 2 Confidential Issue 1 03/2003...

  • Page 3: Table Of Contents

    RX Channel Select Filter..................39 RX Band Filter Response..................40 Tx Tuning ........................41 TX Power Tuning GSM850 ..................43 TX Power Tuning PCS1900..................44 TX I/Q Tuning ......................44 RF Control .........................48 Call Testing ........................48 Nokia Corporation Issue 1 03/2003 Confidential Page 3...
  • Page 4 NPM-10 Troubleshooting Instructions RF CCS Technical Documentation Nokia Corporation Page 4 Confidential Issue 1 03/2003...

  • Page 5: Abbreviations In Troubleshooting Charts

    Measurements stated in this section were done with a HP85024 high impedance probe.). • Note that the test jigs have some losses which must be taken into con- sideration when calibrating the test system. Nokia Corporation Issue 1 03/2003 Confidential Page 5...

  • Page 6: General Description Of The Rf Circuits

    RX850 RXIM INML RXQP INPM RX1900 INMM LPF1 DCN2 RXQM PRE- BBAMP DCN1 LPF2 GAIN Z601 INPH BIQUAD RX1800 INMH VDDDIG Mjoelner CONTROLS VANTL / VANTM N600 Figure 1: Receiver signal path Nokia Corporation Page 6 Confidential Issue 1 03/2003...

  • Page 7: Transmitter Signal Path

    (L709 for GSM850 and L704 for GSM1900) and used in the gain control loop. The TX signal from the couplers is fed to the Antenna switch, which is used to select which sig- nal to route to the antenna. Nokia Corporation Issue 1 03/2003 Confidential...

  • Page 8: Pll

    The VCO (G600) is the component that actually generates the LO frequency. Based on the control voltage input, the VCO generates a differential RF output. This signal is fed to the Prescaler and N-divider in Mjoelner, these two blocks will together divide the frequency Nokia Corporation Page 8 Confidential...
  • Page 9 1930.2 - 1989.8 3860.4 - 3979.6 1850.2 - 1909.8 3700.4 - 3819.6 According to the previous table, the PLL must be able to cover the frequency range 3296.8 MHz to 3979.6 MHz. Nokia Corporation Issue 1 03/2003 Confidential Page 9...

  • Page 10: Key Rf Component Placement

    Mjoelner RF IC Z601 PCS RX SAW Z602 GSM RX SAW Z603 GSM TX SAW B600 26 MHz crystal G600 VCO (3.6 GHz UHF VCO) N700 Power Amplifier (PA) Z700 Antenna switch Nokia Corporation Page 10 Confidential Issue 1 03/2003...

  • Page 11: Power Supply Configuration

    IC have a decoupling capacitor at which the supply voltage can be checked. The power supply configuration used in the 3595 phone is shown in the block diagram that follows: Nokia Corporation Issue 1 03/2003 Confidential Page 11...
  • Page 12 VPLL 2.64 2.78 2.86 2.64 2.78 2.86 VVCO 2.64 2.78 2.86 1.72 1.88 VREF2 VrelRF01 1.334 1.35 1.366 VBATT BATTERY Please see the following graphic for measuring points at the UEM (D200). Nokia Corporation Page 12 Confidential Issue 1 03/2003...

  • Page 13: Receiver

    Figure 7: Supply point at the Mjoelner (N600) Receiver General Instructions for GSM850 RX Troubleshooting Connect the phone to a PC with the module test jig. Start Phoenix and establish connection to the phone. Select File Nokia Corporation Issue 1 03/2003 Confidential Page 13...
  • Page 14 Troubleshooting Instructions RF CCS Technical Documentation Scan for Product Ctrl-R Select Maintenance Testing RF Controls Select: Band: GSM850 Active Unit: Operation Mode: Continuous Rx/Tx Channel: AGC: The setup should now look like this: Nokia Corporation Page 14 Confidential Issue 1 03/2003...

  • Page 15: Troubleshooting Chart For Gsm850 Receiver

    Figure 8: GSM850 receiver troubleshooting chart By measuring with an oscilloscope at RXIP or RXQP on a working GSM850 receiver, the following picture should be seen. Signal amplitude peak-peak 704 mV DC offset 1.38 V Nokia Corporation Issue 1 03/2003 Confidential Page 15...

  • Page 16: General Instructions For Gsm1900 Rx Troubleshooting

    Connect the phone to a PC with the module test jig. Start Phoenix and establish connection to the phone. Select File Scan for Product Ctrl-R Select Maintenance Testing RF Controls Band: GSM1900 Active Unit: Operation Mode: Continuous Rx/Tx Channel: AGC: Nokia Corporation Page 16 Confidential Issue 1 03/2003...
  • Page 17 NPM-10 CCS Technical Documentation Troubleshooting Instructions RF The setup should now look like this: Nokia Corporation Issue 1 03/2003 Confidential Page 17...

  • Page 18: Troubleshooting Chart For Pcs Receiver

    Figure 10: GSM1900 receiver troubleshooting chart By measuring with an oscilloscope at RXIP or RXQP on a working GSM1900 receiver, the following picture should be seen. Signal amplitude peak-peak 416 mV DC offset 1.35 V Nokia Corporation Page 18 Confidential Issue 1 03/2003...
  • Page 19 NPM-10 CCS Technical Documentation Troubleshooting Instructions RF Figure 11: RX1900 I/Q signal waveform Nokia Corporation Issue 1 03/2003 Confidential Page 19...

  • Page 20: Measurement Points In The Receiver

    CCS Technical Documentation Measurement Points in the Receiver RX850 output Z700 Figure 12: RX measurements point at the Antenna switch - Z700 Figure 13: Measurements points at the RX filters – Z601/Z602 Nokia Corporation Page 20 Confidential Issue 1 03/2003...
  • Page 21 NPM-10 CCS Technical Documentation Troubleshooting Instructions RF Figure 14: RX I/Q Signals, Base Band shielding can Nokia Corporation Issue 1 03/2003 Confidential Page 21...

  • Page 22: Transmitter

    NPM-10 Troubleshooting Instructions RF CCS Technical Documentation Transmitter Measurement Points for the Transmitter Figure 15: TX measurement points in the PA ( N700 ) shielding can Nokia Corporation Page 22 Confidential Issue 1 03/2003...

  • Page 23: General Instructions For Gsm Tx Troubleshooting

    The RF cable should be connected to measurement equipment with at least a 10 dB attenuator, or the test equipment may be damaged. Start Phoenix-Service-Software and: Establish a connection to the phone e.g. FBUS or MBUS. Select File Choose Product Nokia Corporation Issue 1 03/2003 Confidential Page 23...

  • Page 24: Troubleshooting Chart For Gsm850 Transmitter

    Troubleshooting Chart for GSM850 Transmitter Troubleshooting the Output Power Use a high impedance probe for the spectrum analyzer measurements in the following chart. Since the signal is bursted, set the trace to maxhold. Nokia Corporation Page 24 Confidential Issue 1 03/2003...
  • Page 25 Figure 17: GSM850 transmitter troubleshooting chart GSM850 band, Power level 5, Channel 190 Black trace: Txp Green trace: Vpctrl @ R713 input Blue trace: Vpctrl_G @ R713 output Red trace: TXC Figure 18: TXP, VPCTRL_G and TXC Nokia Corporation Issue 1 03/2003 Confidential Page 25...

  • Page 26: General Instructions For Pcs Tx Troubleshooting

    RF cable should be connected to measurement equipment or to at least a 10-dB attenu- ator, otherwise the PA may be damaged. Start Phoenix-Service-Software and: Establish a connection to the phone e.g. FBUS. Select File Nokia Corporation Page 26 Confidential Issue 1 03/2003...
  • Page 27 Tx Data Type: All 1 Your screen should look like: Measure the output power of the phone; it should be around 29.5 dBm. Remember the loss in the test jig; around 0.7 dB. Nokia Corporation Issue 1 03/2003 Confidential Page 27...
  • Page 28 Figure 20: GSM1900 transmitter troubleshooting chart PCS 1900 band, Power level 0, Channel 661 Black trace:Vpctrl_P @ R708 output Figure 21: VPCTRL_P ** TXIQ signals look the same in PCS and GSM Nokia Corporation Page 28 Confidential Issue 1 03/2003...

  • Page 29: Synthesizer

    Continuous RX/TX Channel It is not possible to measure the output of the VCO (G600) directly as this component is placed underneath a shielding can without detachable lid. However, with spectrum ana- Nokia Corporation Issue 1 03/2003 Confidential Page 29...

  • Page 30: 26 Mhz Reference Oscillator ( Vcxo )

    VCO (G600) which is between 3 and 4 GHz. This is of course only true if the VCO is working and if the VCO power supply is present (2.7V). Nokia Corporation Page 30 Confidential...

  • Page 31: Troubleshooting Chart For Pll Synthesizer

    VCXO output (R420 – end not connected to C420) is 26MHz and approx. 700mVpp If this is not the case check the reference crystal (B600), Mjoelner (N600), R420, R426, C420, and C426. Nokia Corporation Issue 1 03/2003 Confidential Page 31...

  • Page 32: Measurement Points For The Pll

    NPM-10 Troubleshooting Instructions RF CCS Technical Documentation Measurement Points for the PLL VCXO Vcc (C620) Figure 24: Measurement point for VCXO supply Figure 25: Measurement point for VCXO output Nokia Corporation Page 32 Confidential Issue 1 03/2003...
  • Page 33 NPM-10 CCS Technical Documentation Troubleshooting Instructions RF Measurement Points at the PLL/VCO PLL Vcc (C634) PLL Vcc (C665) Figure 26: Measurement points for PLL Nokia Corporation Issue 1 03/2003 Confidential Page 33...

  • Page 34: Frequency Lists

    3328 3508 209 840.4 885.4 3361.6 3541.6 249 848.4 893.4 3393.6 3573.6 168 832.2 877.2 3328.8 3508.8 250 848.6 893.6 3394.4 3574.4 169 832.4 877.4 3329.6 3509.6 251 848.8 893.8 3395.2 3575.2 Nokia Corporation Page 34 Confidential Issue 1 03/2003...
  • Page 35 759 1899.6 1979.6 3799.2 3959.2 560 1859.8 1939.8 3719.6 3879.6 660 1879.8 1959.8 3759.6 3919.6 760 1899.8 1979.8 3799.6 3959.6 1860 1940 3720 3880 1880 1960 3760 3920 1900 1980 3800 3960 Nokia Corporation Issue 1 03/2003 Confidential Page 35...

  • Page 36: Alignment

    0.7dB for 1900. Use a RCT (radio communication tester), spectrum analzyer, or another suitable device for tuning or testing the phone. The default channels are 190 for GSM850 and 661 for GSM1900. The alignments and calibrations must be performed Nokia Corporation Page 36 Confidential...

  • Page 37: Rx Calibration

    + and – steps the value for every press. Repeat function seems not to work. In I/Q you can use the side arrows. RX Calibration Select Maintenance, Tuning, RX Calibration Select Band GSM850. Note that GSM850 must be calibrated before PCS1900. The result should be as shown: Nokia Corporation Issue 1 03/2003 Confidential Page 37...
  • Page 38 Phoenix will then prompt for 1900MHz calibration while displaying the current values in Again set up sig. gen. settings as shown and select OK. New RSSI values will be calculated and stored in PM. RX cal is now complete. Nokia Corporation Page 38 Confidential Issue 1 03/2003...

  • Page 39: Rx Channel Select Filter

    Next, select to load values from the phone or not Press AutoTune Press Stop and you can select to save values to the phone or not Note: This calibration requires no input signal Nokia Corporation Issue 1 03/2003 Confidential Page 39...

  • Page 40: Rx Band Filter Response

    Press Manual Tuning Set the Signal generator according to the pop-up windows When finished press Stop, Write to PM area and you can select to save values to the phone or not Nokia Corporation Page 40 Confidential Issue 1 03/2003...

  • Page 41: Tx Tuning

    A DC block and at least 10 dB attenuator should be used on the RF input port to protect the spectrum analyzer. The burst power should be measured, so a span of 0 Hertz is used. Span: 0 Hertz Resolution Bandwidth 1 MHz Video Bandwidth 1 MHz Nokia Corporation Issue 1 03/2003 Confidential Page 41...
  • Page 42 Center Frequency: 836.6 MHz (For GSM 850 band, channel 190 is used for Tx output power tuning). For GSM 1900, Center frequency is 1880 MHz (mid Channel 661) for Tx output power tuning. Nokia Corporation Page 42 Confidential Issue 1 03/2003...

  • Page 43: Tx Power Tuning Gsm850

    After tuning the bold power levels, select “Continue to next band”. Phoenix will then cal- culate the coefficients for the remaining power levels, save them to permanent memory, and will proceed to 1900MHz power level tuning. Nokia Corporation Issue 1 03/2003 Confidential...

  • Page 44: Tx Power Tuning Pcs1900

    Settings for spectrum analyzer for I/Q tuning: Same center frequencies are used for GSM 850 (Ch190 = 836.6 MHz) and 1900 (Ch661 = 1880 MHz) as in Tx output power tuning. Span 200 kHz Nokia Corporation Page 44 Confidential Issue 1 03/2003...
  • Page 45 Tune I and Q DC offset values to reduce the carrier frequency to a minimum. Use Side arrows or +, -. Carrier must be at least –30 dBc. Typically carrier supression is better than –40 dBc. Nokia Corporation Issue 1 03/2003 Confidential...
  • Page 46 Tune Amplitude and phase difference to reduce the lowest sideband frequency. The side- band must be reduced at least –35 dBc. Typically sideband supression is better than –40 dBc. Check the IQ tuning values meet the specifications for both 1 and 0 data types. Nokia Corporation Page 46 Confidential Issue 1 03/2003...
  • Page 47 Push “Stop” softkey. This ends tuning and saves the values to the phone if you have selected the “save to product” box. Same procedure is used for PCS1900 as for GSM. Channel will be 661, as pictured below with some typical tuning values. Nokia Corporation Issue 1 03/2003 Confidential Page 47...

  • Page 48: Rf Control

    After the phone has registered to the communications tester, a call can be made. It is possible to let the phone answer via Phoenix. In the Autocaller (Maintenance Testing) you can answer by ticking Answer when button pushed and then push the button. Nokia Corporation Page 48 Confidential...

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