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Nokia NPD-4 Series Technical Documentation Manual

Transceivers
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CCS Technical Documentation
NPD-4 Series Transceivers
Troubleshooting — RF
Nokia Corporation
Issue 1 02/2003
Confidential

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Summary of Contents for Nokia NPD-4 Series

  • Page 1 CCS Technical Documentation NPD-4 Series Transceivers Troubleshooting — RF Nokia Corporation Issue 1 02/2003 Confidential...
  • Page 2 NPD-4 Troubleshooting — RF CCS Technical Documentation Nokia Corporation Page 2 Confidential Issue 1 02/2003...

  • Page 3: Table Of Contents

    Probing/Troubleshooting Tables and Diagrams ............28 Transmitter Probing....................29 Receiver Probing ..................... 34 RF Power Supplies ....................39 Probing Diagrams ....................40 APPENDIX A: Phoenix Instructions................44 To turn on the PCS or Cell CDMA transmitter............44 Nokia Corporation Issue 1 02/2003 Confidential Page 3...
  • Page 4 Robin (N601) Signaling ..................57 Batman (N701) Key Features.................. 58 Batman (N701) Signaling..................59 PA Key Features: Shark (N801, Cell) and Snapper (N802, PCS) ......59 LNA/Downconverter (N750) Key Features............59 APPENDIX E: AGC Algorithms................. 60 Nokia Corporation Page 4 Confidential Issue 1 02/2003...

  • 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 02/2003 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 02/2003...
  • Page 7 PCS TX SAW Filter Cell TX SAW Filter PLL IC PCS Driver UHF VCO Cell Driver VCTCXO TX IC RX IC FLASH Memory DC-to-DC Converter System Conn Figure 1: Expedition (3585i) PWB bottom (general placement) Nokia Corporation Issue 1 02/2003 Confidential Page 7...

  • Page 8: Tuning Descriptions

    256.2 MHz. If the PLL is locked, it will be stable in frequency. If it is unlocked, you may have to use a wide span to see it since it may be far off frequency. Nokia Corporation Page 8...

  • Page 9: St Tx Detector Cell

    Troubleshooting: If there is a failure associated with only some of the cases above, check the AGC voltages and components of the associated PDMs as described in Tables 1 and 3. For problems with the IF or RF AGC, also check Robin and supporting components. For PA Nokia Corporation Issue 1 02/2003 Confidential...

  • Page 10: St Robin Vhfpll Cell

    PWROUT, at probing point 48 in Figure 10, can be measured). Transmitted power for the above case should be greater than 24 dBm. (PWR_OUT greater than 1.09v, which corresponds to the power detector ADC=400). Nokia Corporation Page 10 Confidential...

  • Page 11: St Robin Vhf Pll Pcs

    R808, and checks to make sure the phone is at room temperature. The reason for this is that we don't want to tune a phone while it's hot or cold. The phone reports the ADC voltage value of the thermistor, and it should be within the Nokia Corporation Issue 1 02/2003 Confidential...

  • Page 12: Sn Cell Rx Bb Filter

    This self tuning returns one of the filters tuned parameters, which should be within the limits. Manual Verification: Use RF Tuning window in Phoenix, set mode to “self tune” and choose this tuning. Troubleshooting: Check Batman (N701) and supporting components. Nokia Corporation Page 12 Confidential Issue 1 02/2003...

  • Page 13: Sn Amps Rx Dc Offset I (Or Q)

    Table 2. Check for presence of a TX signal at each point in the TX chain, probing accord- ing to Table 2. TN VCTCXO Frequency The purpose of this tuning is to determine what the AFC DAC value needs to be in order Nokia Corporation Issue 1 02/2003 Confidential Page 13...
  • Page 14 The VHF LO is inside the Robin IC (N601) and troubleshooting of the cell UHF LO is Nokia Corporation Page 14 Confidential...

  • Page 15: Tn Tx Dc Offset Reference Power

    Troubleshooting: If the carrier is not present, troubleshoot the cell TX chain using the “things to check” list and probing tables/diagrams. If the two tones offset at 20 kHz are Nokia Corporation Issue 1 02/2003 Confidential...

  • Page 16: Tn Tx Dc Offset Carrier Suppression

    “values” line in the RF Tuning window, using the below listed values until the mini- mum carrier maximum delta is found. Leave Q at 0. On the “values” line, you enter “I,Q”. The values, in decimal, are: -560 -504 -448 -392 -336 -280 -224 -168 -112 Nokia Corporation Page 16 Confidential Issue 1 02/2003...

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

    Leave the PA_AGC and TX_RF_AGC values as is, then enter the values listed below for the TX_IF_AGC. Measure the output power, then add to each the RF_AGC gain delta cal- culated above. Check that these sums are within the listed ranges. Nokia Corporation Issue 1 02/2003 Confidential...

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

    Write the PDM values listed below into the PA AGC and record the output power. Check to see if the output power is within the ranges listed on the tuning result printout. (Lim- its are not provided in this document as they may change.) Nokia Corporation Page 18 Confidential...

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

    Turn on the cell CDMA transmitter in Phoenix using the RF Main Mode window, and set it to channel 384. Set modulation to IS95 voice. Set the Cell PA PDM to –329. Nokia Corporation Issue 1 02/2003 Confidential Page 19...

  • 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 02/2003 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 02/2003...

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

    Same as previous tuning, except that CDMA2000 (C2K) modulation is used instead of IS95. Explanation of Result: See previous tuning. Manual Verification: Same as previous tuning, except choose the CDMA 2000 tuning in the RF Tuning window. Nokia Corporation Issue 1 02/2003 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 Issue 1 02/2003...

  • 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 02/2003 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 -18 dBm -22 dBm Nokia Corporation Page 26 Confidential Issue 1 02/2003...

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

    CDMA mode. A low amplitude signal (typically at receiver sensitivity level of -104.0 dBm) is injected into the receiver, and the FER is recorded. FER is measured in percentage, and 0.5 % or lower is passing (w/ 95% confidence). Failures are most often Nokia Corporation Issue 1 02/2003 Confidential...

  • Page 28: Final Ui Test: Sinad

    When testing the CDMA receiver, it is easier to inject a CW tone into the receiver. The 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 02/2003 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 02/2003...
  • 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 02/2003 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 02/2003...
  • 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 02/2003 Confidential Page 33...

  • Page 34: Receiver Probing

    Gain In AMPS, ensure 230 mV on I,Q traces of Batman out, probing point 40 of Figure 6. Use CW signal for AMPS, use CDMA signal for CELL and PCS. Call box can generate both. Nokia Corporation Page 34 Confidential...
  • 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 02/2003 Confidential Page 35...
  • Page 36 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 VREFRF01 fixed 57, Figure 6 1.35 v D200, C706, N701 Nokia Corporation Page 36 Confidential Issue 1 02/2003...
  • Page 37 C509, R550, and C550. Pay partic- ular attention to C508, as it is eas- ily damaged. If LO is present and locked, but doesn’t appear at TP 10D, then check R505, R507, L771. Nokia Corporation Issue 1 02/2003 Confidential Page 37...
  • Page 38 R705, C704, R706, C706, C701, C714, R703, R702, C715, R704, V701, C716, L701, C702 VHF LO at 256.2 39, Figure 6 N701, C701, C714, R703, R702, C715, R704, V701, C716, L701, C702, R705, C706 Nokia Corporation Page 38 Confidential Issue 1 02/2003...

  • Page 39: 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 Issue 1 02/2003 Confidential Page 39...

  • Page 40: Probing Diagrams

    NPD-4 Troubleshooting — RF CCS Technical Documentation Probing Diagrams (pin6) pin1 Figure 5: Probing diagram (TX components) Nokia Corporation Page 40 Confidential Issue 1 02/2003...
  • Page 41 NPD-4 CCS Technical Documentation Troubleshooting — RF (check both) Figure 6: Probing diagram (RX IF components) Nokia Corporation Issue 1 02/2003 Confidential Page 41...
  • Page 42 NPD-4 Troubleshooting — RF CCS Technical Documentation Figure 7: Probing diagram (RX LNA components) Figure 8: Probing diagram (BB area) Nokia Corporation Page 42 Confidential Issue 1 02/2003...
  • Page 43 NPD-4 CCS Technical Documentation Troubleshooting — RF Figure 9: Cellular Engine Diagram Nokia Corporation Issue 1 02/2003 Confidential Page 43...

  • Page 44: 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 Page 44 Confidential...

  • Page 45: 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 Issue 1 02/2003 Confidential...
  • Page 46 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 Page 46 Confidential...

  • Page 47: 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 Issue 1 02/2003 Confidential...

  • Page 48: 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 Page 48 Confidential...

  • Page 49: To Load A Prl Into 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 Issue 1 02/2003 Confidential...

  • Page 50: 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 Page 50 Confidential...

  • Page 51: 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 Issue 1 02/2003 Confidential Page 51...

  • Page 52: Appendix C: Block Diagrams

    NPD-4 Troubleshooting — RF CCS Technical Documentation APPENDIX C: Block Diagrams Figure 11: Transmitter Block Diagram Figure 12: Receiver Block Diagram Nokia Corporation Page 52 Confidential Issue 1 02/2003...
  • Page 53 NPD-4 CCS Technical Documentation Troubleshooting — RF Figure 13: Synthesizer Block Diagram Nokia Corporation Issue 1 02/2003 Confidential Page 53...
  • Page 54 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 Page 54 Confidential Issue 1 02/2003...
  • Page 55 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 Issue 1 02/2003 Confidential Page 55...
  • Page 56 NPD-4 Troubleshooting — RF CCS Technical Documentation Figure 17: Detailed Batman Block Diagram Nokia Corporation Page 56 Confidential Issue 1 02/2003...

  • Page 57: 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 Issue 1 02/2003 Confidential Page 57...

  • Page 58: 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 Page 58 Confidential Issue 1 02/2003...

  • Page 59: 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 Issue 1 02/2003 Confidential...

  • Page 60: Appendix E: Agc Algorithms

    NPD-4 Troubleshooting — RF CCS Technical Documentation APPENDIX E: AGC Algorithms Figure 19: CDMA (Cell and PCS) AGC Algorithm Nokia Corporation Page 60 Confidential Issue 1 02/2003...
  • Page 61 NPD-4 CCS Technical Documentation Troubleshooting — RF 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 Issue 1 02/2003 Confidential Page 61...
  • Page 62 NPD-4 Troubleshooting — RF CCS Technical Documentation Nokia Corporation Page 62 Confidential Issue 1 02/2003...

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