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Nokia NPD-1 Series Troubleshooting - Rf
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Nokia NPD-1 Series Troubleshooting - Rf

Nokia NPD-1 Series Troubleshooting - Rf

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CCS Technical Documentation
NPD-1 Series Transceivers
Troubleshooting — RF
Nokia Corporation
Issue 1 11/2002
Confidential

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  • Page 1 CCS Technical Documentation NPD-1 Series Transceivers Troubleshooting — RF Nokia Corporation Issue 1 11/2002 Confidential...
  • Page 2 NPD-1 Troubleshooting — RF CCS Technical Documentation Nokia Corporation Page 2 Confidential Issue 1 11/2002...

  • Page 3: Table Of Contents

    Probing/Troubleshooting Tables and Diagrams ............28 Transmitter Probing....................29 Receiver Probing ..................... 34 RF Power Supplies ....................40 Probing Diagrams ....................41 APPENDIX A: Phoenix Instructions................45 To turn on the PCS or Cell CDMA transmitter............45 Nokia Corporation Issue 1 11/2002 Confidential Page 3...
  • Page 4 Robin (N601) Signaling ..................58 Batman (N701) Key Features.................. 59 Batman (N701) Signaling..................60 PA Key Features: Shark (N801, Cell) and Snapper (N802, PCS) ......60 LNA/Downconverter (N750) Key Features............60 APPENDIX E: AGC Algorithms................. 61 Nokia Corporation Page 4 Confidential Issue 1 11/2002...

  • Page 5: Rf Troubleshooting

    If phone won’t make a call: • ensure phone is in normal mode (i.e., ensure the phone is searching for a signal, i.e., net server is on). • ensure Preferred Roaming List (PRL) is loaded into phone Nokia Corporation Issue 1 11/2002 Confidential Page 5...
  • Page 6 VCTCXO is centered, as described in VCTCXO tuning descrip- tion below • ensure transmitter and receiver are working properly by checking them in local mode. To troubleshoot the antenna circuits, refer to document DHK00086-EN by Tim Mcgaf- figan. Nokia Corporation Page 6 Confidential Issue 1 11/2002...
  • Page 7 NPD-1 CCS Technical Documentation Troubleshooting — RF Figure 1: Eagle PWB bottom (general placement) Nokia Corporation Issue 1 11/2002 Confidential Page 7...

  • Page 8: Tuning Descriptions

    C714, R703, R702, C715, R704, C716, L701, and C702. Also check power supplies to Bat- man, particularly check for 2.7v on VR5 at C710, and on VR7 at C708, and check for 1.8v on VIO. If no fault is found, replace N701 (Batman). Nokia Corporation Page 8 Confidential...

  • Page 9: St Tx Detector Cell

    ADC voltage is wrong (which at this point we cannot read, so we are measuring the actual output power). This can be verified by measuring the voltage on the PWROUT probing point 48 Nokia Corporation Issue 1 11/2002 Confidential...

  • Page 10: St Robin Vhfpll Cell

    24 dBm. (PWR_OUT greater than 1.09v, which corresponds to the power detector ADC=400). For each of the next three cases, TX power should be less than 24 dBm (less than 1.09v on PWR_OUT): TX_IF_AGC to – 80 Nokia Corporation Page 10 Confidential Issue 1 11/2002...

  • Page 11: St Robin Vhf Pll Pcs

    Manual Verification: Ensure the phone is cool by letting it cool down for several minutes, and retest, keeping in mind that if there is a short circuit on the board, then it will get Nokia Corporation Issue 1 11/2002 Confidential...

  • Page 12: Sn Cell Rx Bb Filter

    SN AMPS RX DC Offset I (or Q) This is one of the phone’s self tunings which measures and adjusts the cell band AMPS receiver DC offsets until they are within the limits. Nokia Corporation Page 12 Confidential Issue 1 11/2002...

  • Page 13: Test Tx Start Up Current

    1880 MHz, since it’s easier to measure the tolerance of 1 ppm at 1880 MHz than it is at 19.2 MHz. Additionally the tone at 1880 MHz can be Nokia Corporation Issue 1 11/2002...
  • Page 14 1 of G501. If it is 2.2v, (and pin 4 is at 2.7v, and pin 2 at 0v), then the VCTCXO (G501) is working correctly but the circuit that delivers the control voltage is not. Check Nokia Corporation Page 14...

  • Page 15: Tn Tx Dc Offset Reference Power

    Robin (VR2, VR3, VR6, and VIO) are correct. Check components around Robin. If still failing, replace Robin. TN TX DC Offset Carrier Suppression See previous tuning. This step reports the delta between the reference at 836.52 MHz Nokia Corporation Issue 1 11/2002 Confidential Page 15...
  • Page 16 If the minimum is 35 dB or greater, the phone passes. If the minimum is less than 35 dB, then vary Q in the same manner as I using the above values, holding I constant at the minimum value determined above, until the delta is at least 35 dB. Nokia Corporation Page 16 Confidential...

  • Page 17: Tn Tx If Agc Cell Po (0) [Or (1), (2), (3), Or (4)]

    Troubleshooting: Check Robin (N801) and supporting components. Also check D400, which generates the PDM signals. Check AGC PDM voltages according to Tables 1 and 3. Troubleshoot the rest of the transmitter chain if necessary as described in Table 2. Nokia Corporation Issue 1 11/2002 Confidential...

  • Page 18: Tn Pa Gain Cal Cell Po (0) [Or, (1), (2), (3), (4), Or (5)]

    PA, or if the power level is correct going into the PA but the PA gain is too low. If the power level going into the PA is too low, probe the TX chain at all the Nokia Corporation Page 18...

  • Page 19: Tx Tx If 11 Dbm Set Cell Po

    +11 dBm on the output. Change the TX RF AGC to the settings in the following table, and measure the TX power levels, checking to see that they are within the specified range. Nokia Corporation Issue 1 11/2002 Confidential...

  • Page 20: Tn Tx Gain Comp Cell (Or Pcs) Po Md (Or Lo, Lm, Ml, Mh, Hm, Or Hi)

    Once this is done on the center channel, change to each of the other channels, and record the power. Do not adjust G_Offset on the other channels — just record the power. It should be within the limits listed in the tuning results file. Nokia Corporation Page 20 Confidential...

  • Page 21: Tn G_Offset Cell Md

    Adjust TxdBCtr in the “values” dialog box until the output power is within the limits (adjusting for cable loss). Troubleshooting: Troubleshoot the cell transmitter as described in the Probing/Trouble- shooting Tables and Diagrams section, setting the TX AGC values to those listed for Nokia Corporation Issue 1 11/2002 Confidential Page 21...

  • Page 22: Tn Amps Pl3 (Or 4, 5, 6, Or 7) Po

    Cell PA Temp section, except that the phone is set up to transmit in PCS mode on chan- nel 600. The transmit frequency is 1880 MHz The results are TX power readings in dBm of the transmitted signal corresponding to PDM settings of the PCS TX RF AGC. Nokia Corporation Page 22 Confidential Issue 1 11/2002...

  • Page 23: Tn Tx Limiting Po Cell (Or Pcs) Is95, Low Channel (Or Lowmid, Midlow, Mid, Midhigh, Highmid, Or High Channel)

    TN TX Limiting Cell (or PCS) CDMA2000: Po Same as previous tuning, except that CDMA2000 (C2K) modulation is used instead of IS95. Explanation of Result: See previous tuning. Nokia Corporation Issue 1 11/2002 Confidential Page 23...

  • Page 24: Ts Acpr Pcs- Low (High)

    30 kHz bandwidth rather than 1.23 MHz. Figures 3 and 4 below show examples of good and bad ACPR. Figure 3: Good ACPR (analyzer screenshot) Nokia Corporation Page 24 Confidential...

  • Page 25: Tn Pa Detector Pcs Po (0) [Or (1), (2), (3), (4), (5), (6), Or (7)]

    PCS) IS95 section (TX Limiting). Next, choose the PA Detector PCS tuning in the RF Tun- ing window. Enter the values of TxdBCtr that are listed in the following table into the “values” dialog box, and ensure that the transmitted power is within the limits. Nokia Corporation Issue 1 11/2002 Confidential...

  • Page 26: Ts Acpr Cell - Low

    The result is a value of RxdBCtr (which corresponds to a value of RX_IF_AGC) for each of three CW input powers injected into the receiver: Trimode PCS only -87.5 dBm -89 dBm -57 dBm -61 dBm Nokia Corporation Page 26 Confidential Issue 1 11/2002...

  • Page 27: Tn Lna Amps (Or Cell Or Pcs) Lowgain (Or Highgain) Lo (Or Lm, Ml, Md, Mh, Hm, Hi)

    Rho is measured with sector power= 75 dBm. If Rho fails, first check the signal purity of the LOs. Check synthesizer compo- nents and power supply decoupling. Nokia Corporation Issue 1 11/2002 Confidential...

  • Page 28: Final Ui Test: Frame Error Rate (Fer)

    5 dB since the input impedance might be different from the output imped- ance. However, after mathematically adjusting the power on either the input or output to compensate for the difference in impedance, 5 dB is then calculated. Most compo- Nokia Corporation Page 28 Confidential...

  • Page 29: Transmitter Probing

    IMPORTANT NOTE: AGC PDM values will change (sometimes drastically) as the phone warms up. The table above lists PDM values for when the phone is first turned on. After 10 minutes at full power, PDM values will be different. Nokia Corporation Issue 1 11/2002 Confidential...
  • Page 30 X814, then additionally: X811. (In singlemode mended unless phones, a resistor necessary; best replaces the to measure on unused duplexer: RF connector R810 for PCS only, R811 for Cell only) Nokia Corporation Page 30 Confidential Issue 1 11/2002...
  • Page 31 C425, C431, V422, N601 PD_CELL High for TX on, 49, Figure 5 High=2.6v N601, C649, N603 (pin 4) Low for TX off Low=0v VREFRF02 fixed 50, Figure 5 1.35v D200, C606, N601 Nokia Corporation Issue 1 11/2002 Confidential Page 31...
  • Page 32 20, Figure 5 Loss=0.5 – 1.0 dB through switch N805 (including FILSEL1 and = PCS PA (N802) FILSEL2 as in Table 5), N802 (including check for 3.6v on Vbat), C809, C814, C808 Nokia Corporation Page 32 Confidential Issue 1 11/2002...
  • Page 33 VHF LO at 11a, Figure 5 N601, C612, C613, R607, R605, 416.2 MHz for C632, R606, C618, R609, C629, PCS, any channel V602, C637, V601, C630, C631, L611, C638, R604, R601, R602 Nokia Corporation Issue 1 11/2002 Confidential Page 33...

  • Page 34: Receiver Probing

    PCS ch 600 Low- 1.01 -65 dBm Gain PCS ch 600 High- -109 0.79 -95 dBm Gain In AMPS, ensure 230 mV on I,Q traces of Batman out, probing point 40 of Figure 6. Nokia Corporation Page 34 Confidential Issue 1 11/2002...
  • Page 35 C508, R508, R503, C509, R550, and C550. Pay particular attention to C508, as it is easily damaged. If LO is present and locked, but doesn’t appear at TP 10D, then check R505, R507, L771. Nokia Corporation Issue 1 11/2002 Confidential Page 35...
  • Page 36 55, Figure 7 High=2.4vmin, N701, N750, R764, C753 gain, Low=LNA Low=0.3v max low gain (both Cell & PCS) IF_SEL High= 56, Figure 7 High=2.4vmin, N701, N750, R765, C750 AMPS, Low= Low=0.3v max CDMA Nokia Corporation Page 36 Confidential Issue 1 11/2002...
  • Page 37 Z750 PCS RX saw 44, Figure 7 Loss=1-4 dB Z750, N750 and supporting com- (Z750) out=Alfred ponents (including check for proper (N750) mixer in voltages on Alfred signaling as in Table 9) Nokia Corporation Issue 1 11/2002 Confidential Page 37...
  • Page 38 UEM (D200) see Table 6. on VREFRF01 as in Table 9, also check RX_IF_AGC as in Table 9), R705, C704, R706, C706, C701, C714, R703, R702, C715, R704, V701, C716, L701, C702 Nokia Corporation Page 38 Confidential Issue 1 11/2002...
  • Page 39 DC power applied if board loss (dB) active, correct voltage of DC signals, otherwise replace) VHF LO at 256.2 39, Figure 6 N701, C701, C714, R703, R702, C715, R704, V701, C716, L701, C702, R705, C706 Nokia Corporation Issue 1 11/2002 Confidential Page 39...

  • Page 40: Rf Power Supplies

    Batman figure 9 2.78 UHF LO Buffer figure 9 2.78 Batman figure 9 Robin, UHF PLL figure 9 2.78 Alfred figure 9 VPLL 2.78 UHF PLL figure 9 VBAT 3.1-4.2 figure 9 Nokia Corporation Page 40 Confidential Issue 1 11/2002...

  • Page 41: Probing Diagrams

    NPD-1 CCS Technical Documentation Troubleshooting — RF Probing Diagrams (pin6) pin1 Figure 5: Probing diagram (TX components) Nokia Corporation Issue 1 11/2002 Confidential Page 41...
  • Page 42 NPD-1 Troubleshooting — RF CCS Technical Documentation (check both) Figure 6: Probing diagram (RX IF components) Nokia Corporation Page 42 Confidential Issue 1 11/2002...
  • Page 43 NPD-1 CCS Technical Documentation Troubleshooting — RF Figure 7: Probing diagram (RX LNA components) Figure 8: Probing diagram (BB area) Nokia Corporation Issue 1 11/2002 Confidential Page 43...
  • Page 44 NPD-1 Troubleshooting — RF CCS Technical Documentation Figure 9: Probing diagram (voltage regulators) Nokia Corporation Page 44 Confidential Issue 1 11/2002...

  • Page 45: Appendix A: Phoenix Instructions

    To turn on the PCS or Cell CDMA transmitter Under the "RF" menu, choose "main mode", which opens the dialog box shown below. To turn on the transmitter, first turn on the carrier by highlighting "RX/TX" in the sub- Nokia Corporation Issue 1 11/2002 Confidential...

  • Page 46: To Turn On The Amps Transmitter

    AMPS transmitter is turned on in this manner, it does not respond correctly to AGC PDM adjustment. As a temporary solution, the “AMPS Control” dialog box, shown below, can be used. Nokia Corporation Page 46 Confidential...
  • Page 47 Once the contents of both addresses are changed to “0”, click the Write button, which writes them into the phone. This data will remain in the phone until the phone is powered down. Nokia Corporation Issue 1 11/2002 Confidential...

  • Page 48: To Turn On The Receiver Only, In Any Mode

    The values are in decimal. Then click Set button. Alternatively, you can click the up and down arrows next to the value fields below the sliders, which will increase or decrease the value one step at a time. If you do this, you do not have to click Set. Nokia Corporation Page 48 Confidential...

  • Page 49: To Read Tuning Values From The Phone

    The AGC PDM values are shown beside their respective variable gain amplifier in the block diagram. The TX AGC PDMs are, as shown in the diagram from right to left, IF_AGC, RF_AGC, PA_AGC. Nokia Corporation Issue 1 11/2002 Confidential...

  • Page 50: To Load A Prl Into The Phone

    To troubleshoot so that you can manually control the phone (not in a call), the phone should be in local mode. In local mode, the phone’s software is not running and it will not search for a pilot. To switch Nokia Corporation Page 50 Confidential...

  • Page 51: To Add A Baseband Test Tone To The Amps Transmitter

    To add a baseband test tone to the AMPS transmitter To add a baseband test tone to the AMPS transmitter, open the “Test Tone” dialog box as shown below and set the parameters as desired. Nokia Corporation Issue 1 11/2002 Confidential...

  • Page 52: Appendix B: Definitions

    PLL: Phase Locked Loop. Used in Synthesizer circuits to generate an LO. PPM: part per million RSSI: Received Signal Strength Indicator Nokia Corporation Page 52 Confidential Issue 1 11/2002...

  • Page 53: Appendix C: Block Diagrams

    NPD-1 CCS Technical Documentation Troubleshooting — RF APPENDIX C: Block Diagrams Figure 11: Transmitter Block Diagram Figure 12: Receiver Block Diagram Nokia Corporation Issue 1 11/2002 Confidential Page 53...
  • Page 54 NPD-1 Troubleshooting — RF CCS Technical Documentation Figure 13: Synthesizer Block Diagram Nokia Corporation Page 54 Confidential Issue 1 11/2002...
  • Page 55 RX IF 30 kHz Steps CELL 128.1 MHz RX Q 1930.00 - 1989.95 MHz PCS 128.1 MHz 50 kHz Steps Figure 14: Frequency Plan Figure 15: Distribution of VCTCXO tone at 19.2 MHz Nokia Corporation Issue 1 11/2002 Confidential Page 55...
  • Page 56 TEST1 1.35V reference voltage RBIAS SSB MIXER EXT VCO input TX_IF_AGC_REF TX_IF_AGC PLL_TESTN PLL_TESTP VHF VCO tank VHF charge-pump out VCO BAND SWITCH RF_BUS_EN1X RF_BUS_DATA RF_BUS_CLK Figure 16: Detailed Robin Block Diagram Nokia Corporation Page 56 Confidential Issue 1 11/2002...
  • Page 57 NPD-1 CCS Technical Documentation Troubleshooting — RF Figure 17: Detailed Batman Block Diagram Nokia Corporation Issue 1 11/2002 Confidential Page 57...

  • Page 58: Descriptions Of Selected Components, Signaling, And Architecture

    - TX_GATE: used to turn on various blocks. Used with puncturing, and to turn on power down circuits. Input to Robin. - VREFRF02: Robin input, voltage reference from UEM. Should be 1.35v - FILSEL1 and FILSEL2: control lines which enable Robin to control the switch N605. Nokia Corporation Page 58 Confidential Issue 1 11/2002...

  • Page 59: Batman (N701) Key Features

    - IF to BB downconverter - Contains on-chip VHF LO - Contains IF Variable Gain Amplifier - Contains baseband filters (BBFIL) and baseband amplifiers (BBAMP) Has digital inter- face for control by external digital controller Nokia Corporation Issue 1 11/2002 Confidential Page 59...

  • Page 60: Batman (N701) Signaling

    Hornet (PCS) and Tomcat (Cell) are driver amplifiers whose outputs are connected to the TX filters. Hornet has one input and two outputs, since the output is connected to the split band filter. Both are powered directly from the battery. Nokia Corporation Page 60 Confidential...

  • Page 61: Appendix E: Agc Algorithms

    NPD-1 CCS Technical Documentation Troubleshooting — RF APPENDIX E: AGC Algorithms Figure 19: CDMA (Cell and PCS) AGC Algorithm Nokia Corporation Issue 1 11/2002 Confidential Page 61...
  • Page 62 NPD-1 Troubleshooting — RF CCS Technical Documentation AMPS AGC IF AGC TOTAL PA AGC RF AGC AMPS PWR LEVEL LEVELS Output Power dBm dBm dBm Figure 20: AMPS AGC Algorithm Nokia Corporation Page 62 Confidential Issue 1 11/2002...

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