Nokia RM-11 Series Troubleshooting Manual
  1. Manuals
  2. Brands
  3. Nokia Manuals
  4. Transceiver
  5. RM-11 Series
  6. Troubleshooting manual
Nokia RM-11 Series Troubleshooting Manual

Nokia RM-11 Series Troubleshooting Manual

Rf
Hide thumbs Also See for RM-11 Series:
Table of Contents

Advertisement

Quick Links

CC Technical Documentation
RM-11 Series Transceivers
Troubleshooting - RF
©2005 Nokia Corporation
Issue 2 09/2005
Confidential

Advertisement

Table of Contents
loading

Related Manuals for Nokia RM-11 Series

Summary of Contents for Nokia RM-11 Series

  • Page 1 CC Technical Documentation RM-11 Series Transceivers Troubleshooting - RF ©2005 Nokia Corporation Issue 2 09/2005 Confidential...

  • Page 2: Table Of Contents

    Tx Troubleshooting Using Phoenix .......................38 PCS Band Tx Probe Points ........................40 Cell and AMPS Band Tx Probe Points ....................41 Tx AMPS Troubleshooting Using Phoenix ...................42 Rx Troubleshooting ............................. 43 Receiver Schematic ...........................44 ©2005 Nokia Corporation Page 2 Confidential Issue 2 09/2005...
  • Page 3 Back Panel Control Signals RF-BB Interface ..................52 GPS Introduction............................53 GPS Block Diagram ...........................53 GPS RF Schematic .............................53 GPS Testing ..............................54 GPS RF Probing Setup ..........................57 GPS RF Probing Measurements......................58 ©2005 Nokia Corporation Issue 2 09/2005 Confidential Page 3...
  • Page 4 RM-11 Troubleshooting - RF Nokia Customer Care This page intentionally left blank. ©2005 Nokia Corporation Page 4 Confidential Issue 2 09/2005...

  • Page 5: Introduction

    VCTCXO VCTCXO VCTCXO Inverter VCTCXO Inverter Memory Memory GPS BB IC GPS BB IC GPS RF IC GPS RF IC GPS TCXO GPS TCXO Figure 2: Baseband components - bottom view ©2005 Nokia Corporation Issue 2 09/2005 Confidential Page 5...

  • Page 6: Equipment List For Rf Troubleshooting

    256.2 MHz 869.04 - 893.97 MHz CELL RX IF 30 kHz Steps CELL 128.1 MHz 1930.00 - 1989.95 MHz RX Q 128.1 MHz 50 kHz Steps Figure 3: RF block diagram ©2005 Nokia Corporation Page 6 Confidential Issue 2 09/2005...

  • Page 7: Rf (Manual Control) Components In Phoenix

    RF (Manual Control) Components in Phoenix Phone Control in DSP Phone Control in DSP RF Main Mode in RF RF Main Mode in RF CDMA Control in DSP CDMA Control in DSP ©2005 Nokia Corporation Issue 2 09/2005 Confidential Page 7...
  • Page 8 RM-11 Troubleshooting - RF CC Technical Documentation RF PDM in RF RF PDM in RF ©2005 Nokia Corporation Page 8 Confidential Issue 2 09/2005...

  • Page 9: Observing Tx Output Spectrum On Analyzer

    • Enable Local Mode (test jig can be set to Local) • Select CDMA and Rx/Tx Mode (Tx path enabled) • Select Rho ON on CDMA Control and Execute • Adjust the 3 Tx AGC for proper output power level ©2005 Nokia Corporation Issue 2 09/2005 Confidential Page 9...

  • Page 10: Rf Pdm Settings

    Control range from -1024 to +1023. Used as a control line to tune the VCTCXO. Monitor the change in frequency of the VCTCXO as the AFC is changed. Use in Local Mode only. ©2005 Nokia Corporation Page 10 Confidential Issue 2 09/2005...
  • Page 11 Use in Local Mode only. • Automatic Gain Control for Receiver (Rx AGC): Consists of the Rx IF AGC. Used as a control line to adjust the receiver input level. Use in Local Mode only. ©2005 Nokia Corporation Issue 2 09/2005 Confidential Page 11...

  • Page 12: Other Rf Parameters In Phoenix

    RM-11 Troubleshooting - RF CC Technical Documentation Other RF Parameters in Phoenix Gen I/O in RF RF register Read/Write in RF Frequency Calculator in RF ©2005 Nokia Corporation Page 12 Confidential Issue 2 09/2005...

  • Page 13: Rf Tuning Parameters In Phoenix

    When reading the tuning parameters from the phone, always use the “Read All” button in order to read the entire set of use the “Read All” button in order to read the entire set of tuning values. tuning values. ©2005 Nokia Corporation Issue 2 09/2005 Confidential Page 13...

  • Page 14: Rf Agc Status Components In Phoenix

    Call Mode. works in Call Mode. Tx IF AGC PDM settings Tx RF AGC PDM settings PA AGC PDM settings Note: Always measure resistance with the mobile terminal powered off. ©2005 Nokia Corporation Page 14 Confidential Issue 2 09/2005...

  • Page 15: Cdma In-Call Testing

    If a call cannot be made in either PCS or Cell band, proceed with Local Mode troubleshooting. 5. If the mobile terminal call is successful, open the RF menu, select AGC Status, and click Enable Trace on the AGC Status dialog box. ©2005 Nokia Corporation Issue 2 09/2005 Confidential Page 15...

  • Page 16: Cdma In Call Testing (Low Gain)

    3. Verify that Cell PDMs for Rx and Tx are within the specified tolerances: • Cell: Tx power (dBm) = -73 — RSSI • PCS: Tx power (dBm) = -76 — RSSI ©2005 Nokia Corporation Page 16 Confidential Issue 2 09/2005...

  • Page 17: Cdma In Call Testing (High Gain)

    4. Verify that all PDMs for Rx and Tx are within tolerances specified in the above table. • Cell: Tx power (dBm) = -73 — RSSI • PCS: Tx power (dBm) = -76 — RSSI ©2005 Nokia Corporation Issue 2 09/2005 Confidential Page 17...

  • Page 18: Cdma In Call Testing (Amps)

    6. Compare the RSSI reading from on the RF AGC Status dialog box to the sector power. The value should be accurate to +/-2dB. 7. Compare the Tx power to the digital average power on the call box. The value should be accurate to +/-2dBm. ©2005 Nokia Corporation Page 18 Confidential Issue 2 09/2005...

  • Page 19: Typical Pdm Readings

    -65dBm Sector Power CDMA Channel 600 Parameter Typical PDM Value RSSI -65dBm Low gain state RxIF AGC PDM Tx IF AGC PDM Tx RF AGC PDM +237 Tx PA gain PDM -330 Tx Power -11dBm ©2005 Nokia Corporation Issue 2 09/2005 Confidential Page 19...
  • Page 20 -104dBm Sector Power CDMA Channel 600 Parameter Typical PDM Value RSSI -104dBm High gain state RxIF AGC PDM -115 Tx IF AGC PDM Tx RF AGC PDM -456 Tx PA gain PDM +220 Tx Power +19dBm ©2005 Nokia Corporation Page 20 Confidential Issue 2 09/2005...
  • Page 21 -65Bm Sector Power CDMA Channel 384 Parameter Typical PDM Value RSSI -65dBm Low gain state RxIF AGC PDM Tx IF AGC PDM Tx RF AGC PDM +125 Tx PA gain PDM -327 Tx Power -8dBm ©2005 Nokia Corporation Issue 2 09/2005 Confidential Page 21...
  • Page 22 -104dBm Sector Power CDMA Channel 384 Parameter Typical PDM Value RSSI -103dBm High gain state RxIF AGC PDM -127 Tx IF AGC PDM Tx RF AGC PDM -450 Tx PA gain PDM +220 Tx Power +19dBm ©2005 Nokia Corporation Page 22 Confidential Issue 2 09/2005...

  • Page 23: Tx Pdm Characteristic Curves (Call Mode)

    CC Technical Documentation Troubleshooting - RF Tx PDM Characteristic Curves (Call Mode) Tx AGC PDM Plots in a Call Tx_IF_AGC Tx_RF_AGC PA_AGC -112 -212 -312 -412 -512 Tx Pow er(dBm ) ©2005 Nokia Corporation Issue 2 09/2005 Confidential Page 23...

  • Page 24: Rx Pdm Characteristic Curve (Call Mode)

    PDM is due to the LNA gain state PDM is due to the LNA gain state -200 switched between Hi and Lo gains switched between Hi and Lo gains -300 -110 -100 Rx Power (dBm) ©2005 Nokia Corporation Page 24 Confidential Issue 2 09/2005...

  • Page 25: Key Rf Performance Tests In Call Mode

    Usually, the LNA turns on between -93dBm and -95dBm. If the LNA does not turn off at all on the RF AGC Status dialog box while in a call, you have bad sensitivity. ©2005 Nokia Corporation Issue 2 09/2005 Confidential...

  • Page 26: Supply Lines Measurement Using Phoenix

    = 2.78VDC = 2.78VDC = 2.78VDC VR1A = 4.75VDC VR1A = 4.75VDC = 2.78VDC = 2.78VDC = 2.78VDC = 2.78VDC VR1B VR1B = 4.75VDC = 4.75VDC VCORE = 1.5VDC VCORE = 1.5VDC ©2005 Nokia Corporation Page 26 Confidential Issue 2 09/2005...

  • Page 27: Supply Lines Distribution By Rf Components

    15kΩ to GND N701, N601, UHF PLL 45kΩ to GND N701 46kΩ to GND N601 VCORE 4.5kΩ to GND UEM, UPP Note: Always measure resistance with the mobile terminal powered off. © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 27...

  • Page 28: Top Rf-Related Failures Seen In Flali

    Inject signal and probe Rx PCS chain for gain to key out any failed parts. GPS MS Test Mode x (all tests) Check VL . RF Probe GPS chain. NA_GPS CORE © 2005 Nokia Corporation Page 28 Confidential Issue 2 09/2005...

  • Page 29: Top Rf-Related Failures Seen In Finui

    Tx limiting power is most likely caused by a poor RF connection. RF MS TX Limiting Po CELL CH1013 Tx limiting power is most likely caused by a poor RF connection. © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 29...

  • Page 30: Synthesizer Troubleshooting

    TX VHF Synthesizer Reference Phase Charge Divider Detector Pump Cell 2 mA VCTCXO TX VHF VCO 19.2 MHz Prescaler Tank 9-Bit B Counter 32/33 Cell 5-Bit A Counter Cell Band Control © 2005 Nokia Corporation Page 30 Confidential Issue 2 09/2005...

  • Page 31: Synthesizer Setup Using Phoenix

    Tx VHF: Use Rx/Tx mode in both PCS and Cell band 2. Use RF Main Mode dialog box to set: • Band • Channel • Rx/Tx mode. Note: Be sure the “Main Mode set successfully” message appears. © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 31...

  • Page 32: Vctcxo Troubleshooting

    VCTCXO To N701 PLL 19.2MHz @ +4.5 dBm (CLK19M2_B) To N601 PLL 19.2 MHz @ +4.5dBm (CLK19M2_R) To BB UPP 19.2MHz @ +7.5dBm (CLK19M2_UPP) VR3 = 2.78VDC VIO = 1.8VDC © 2005 Nokia Corporation Page 32 Confidential Issue 2 09/2005...

  • Page 33: Uhf Synthesizer Troubleshooting

    If you do not see the presence of any LOs, check the DC voltages at the following locations: • R513, VR1A, supply line for UHF PLL IC, should be 4.76VDC • R515, VR4, supply line for VCO IC, should be 2.76VDC © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 33...

  • Page 34: Uhf Synthesizer Schematic

    RM-11 Troubleshooting - RF CC Technical Documentation UHF Synthesizer Schematic UHF PLL IC Dual Band V C O Lock voltage Loop filter components © 2005 Nokia Corporation Page 34 Confidential Issue 2 09/2005...

  • Page 35: Uhf Synthesizer Layout

    Dual Band UHF V C O TX LO buffer RF probe point, TX LO output levels: C E LL C H 384: 1009.62MHz @ –0.5dBm PC S C H 600: 2088.1MHz @ -20dBm © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 35...

  • Page 36: Uhf Frequency Is Incorrect

    • Power supplies to PLL IC (N507) is missing or low. • Loop filter components missing or incorrectly installed. • 19.2MHz reference clock missing or low. • Programming is incorrect. • Component failure (VCO or PLL IC). © 2005 Nokia Corporation Page 36 Confidential Issue 2 09/2005...

  • Page 37: Rx Vhf (N701 Lo) Schematic

    • Monitor control voltage at C715. The control voltage at locked state should be between 1.2 and 1.7VDV for the proper operation of N701 LO. Loop filter components Lock voltage PLL i R esonator © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 37...

  • Page 38: Rx Vhf Layout

    • Power supplies to PLL portion of N701 IC missing or low (VR7) • Loop filter or resonator components missing or incorrectly installed • 19.2MHz reference clock missing or low (C512) • Programming is incorrect • Component failure (PLL IC) © 2005 Nokia Corporation Page 38 Confidential Issue 2 09/2005...

  • Page 39: Tx Vhf Schematic

    • Monitor control voltage at C632. At this control voltage, the N601 LO is locked (it should be between 1.2 and 1.8VDC). Lock voltage N601 Loop filter R esonator © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 39...

  • Page 40: Tx Vhf Layout

    • Power supplies to PLL portion of N601 IC missing or low (VR3) • Loop filter or resonator components missing or incorrectly installed • 19.2MHz reference clock missing or low (G513) • Programming is incorrect • Component failure (PLL IC) © 2005 Nokia Corporation Page 40 Confidential Issue 2 09/2005...

  • Page 41: Tx Troubleshooting

    RM-11 Nokia Customer Care Troubleshooting - RF Tx Troubleshooting Figure 4: Tx system block diagram © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 41...
  • Page 42 • Agilent call box 8960 is recommended to measure Tx power at RF connector. • The numbers in the following diagram indicate the general RF signal flow and probing locations. © 2005 Nokia Corporation Page 42 Confidential Issue 2 09/2005...

  • Page 43: Tx Schematic 1

    CC Technical Documentation Troubleshooting - RF Tx Schematic 1 PCS Band PCS split-band SAW Filter PCS Driver PCS switch Cell Driver Cell SAW Filter Cell Band Robin TX Up- converter © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 43...

  • Page 44: Tx Schematic 2

    PCS Duplexer PCS Isolator PCS Isolator PCS PA PCS PA Diplexer Diplexer Connector Connector Cell PA Cell PA Cell Isolator Cell Isolator Cell Duplexer Cell Duplexer Power Power Detector Detector © 2005 Nokia Corporation Page 44 Confidential Issue 2 09/2005...

  • Page 45: Tx Troubleshooting Using Phoenix

    Band • Channel • Rx/Tx mode PCS Band Cell Band Note: Be sure the “Main Mode set successfully” message appears. 5. Open the DSP menu, and click CDMA Control . © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 45...
  • Page 46 Local Mode (either PCS channel 600 or Cell chan 384): • PA Gain PDM = +220 • RF AGC PDM = -512 • IF AGC PDM = -105 (PCS), -135 (Cell) © 2005 Nokia Corporation Page 46 Confidential Issue 2 09/2005...
  • Page 47 Troubleshooting - RF With PDMs set to the above values: Tx Pout ≅ 23dBm (PCS) • Current ≅ 720mA (PCS) Tx Pout ≅ 25dBm (Cell) • Current ≅ 880mA (Cell) © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 47...

  • Page 48: Pcs Band Tx Probe Points

    Probed power ≅ +18dBm (If not, then replace PCS PA) 5. C809 IREF into PCS PA should be ≅ 2.7V (If not, trace back to N601 and then to BB) © 2005 Nokia Corporation Page 48 Confidential Issue 2 09/2005...

  • Page 49: Cell And Amps Band Tx Probe Points

    Probed power ≅ +21dBm (If not, then replace Cell PA) 5. C811 IREF into Cell PA should be ≅ 2.7V (If not, then trace back to N601 and then to BB) © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 49...

  • Page 50: Tx Amps Troubleshooting Using Phoenix

    Note: If you do not measure the correct Tx power at the RF connector, repeat Cell band Local Mode troubleshooting to find where the failure occurs. AMPS and Cell band share the same Tx path. © 2005 Nokia Corporation Page 50 Confidential...

  • Page 51: Rx Troubleshooting

    RM-11 Troubleshooting - RF Nokia Customer Care Rx Troubleshooting Figure 5: Rx system block diagram © 2005 Nokia Corporation Page 51 Confidential Issue 2 09/2005...

  • Page 52: Receiver Schematic

    Cell,” then select “CW.” • Inject a CW signal for PCS (1960MHz) or Cell/AMPS (881.52MHz) at a fixed -25dBm power level. The numbers below indicate the general RF signal flow and probing locations. © 2005 Nokia Corporation Page 52 Confidential Issue 2 09/2005...

  • Page 53: Turning On Rx Path Using Phoenix

    2. Set to Rx mode, the set the band and channel: • PCS channel = 600, Rx = 1960MHz • Cell channel = 384, Rx = 881.52MHz • AMPS channel = 384, Rx = 881.52MHz © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 53...

  • Page 54: Switching Rx Gain States Using Phoenix

    CC Technical Documentation Switching Rx Gain States Using Phoenix Two gain states (Hi and Lo) are available in the receiver for CDMA and AMPS modes: Hi Gain State Lo Gain State © 2005 Nokia Corporation Page 54 Confidential Issue 2 09/2005...

  • Page 55: Rx If Troubleshooting Layout

    AMPS IF AMPS IF Crystal Filter Crystal Filter CDMA IF CDMA IF SAW Filter SAW Filter CDMA IF (to N701) 128.1MHz Cell -20.7dBm (HG) -38.5dBm (LG) PCS -20.0dBm (HG) -20.0dBm (LG) © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 55...

  • Page 56: Rx Rf Troubleshooting Layout

    Cell RF SAW Filter Cell RF SAW Filter IF MIX OUT (from N750) 128.1 MHz @ -11.6dBm (HG) 128.1MHz @ -25.0dBm 9LG) PCS RF SAW Filter PCS RF SAW Filter © 2005 Nokia Corporation Page 56 Confidential Issue 2 09/2005...

  • Page 57: Receiver Dc Troubleshooting Layout

    C_LNA Vdd = 2.779VDC External Vdd supply line for Cell LNA P_LNA Vdd = 2.779VDC External Vdd supply line for PCS LNA IFA Vdd = 2.779VDC IFA Vdd supply line for CDMA and AMPS IFs © 2005 Nokia Corporation Issue 2 09/2005 Confidential...

  • Page 58: Measure Logic Levels For Rx Front End (N750)

    2.76 V Note: If logic levels are significantly off (+/- 0.2V), replace N750 and remeasure. If voltages are still out-of-spec, see the Baseband Description and Troubleshooting chapter of this manual. © 2005 Nokia Corporation Page 58 Confidential Issue 2 09/2005...

  • Page 59: N750 Rx Troubleshooting

    128.1MHz (L753), check if IF_Sel is working. If it is, then replace N750 (bad RFA). • If Cell and AMPS are working fine, but PCS is not, look at the band select line and the PCS LNA before replacing N750. © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 59...

  • Page 60: Rx Dc Troubleshooting N750

    N750. Condition (Local Mode, Set Supply Current (from Power Supply) Rx only in RF Main Mode) Good mobile terminal 104mA No UHF LO Signal present 254mA Pin 13 shorted 255mA © 2005 Nokia Corporation Page 60 Confidential Issue 2 09/2005...

  • Page 61: Control Signals At Rf-Bb Interface

    RM-11 CC Technical Documentation Troubleshooting - RF Control Signals at RF-BB Interface Note: These components are located at the back panel. Check from SMD or missing components. © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 61...

  • Page 62: Back Panel Control Signals Rf-Bb Interface

    RM-11 Troubleshooting - RF CC Technical Documentation Back Panel Control Signals RF-BB Interface © 2005 Nokia Corporation Page 62 Confidential Issue 2 09/2005...

  • Page 63: Gps Introduction

    The GPS circuitry and the cellular engine (CE) circuitry are completely separate. The GPS circuitry is located almost exclusively on the secondary side of the PWB, underneath the display module. © 2005 Nokia Corporation Issue 2 09/2005 Confidential...

  • Page 64: Gps Block Diagram

    RM-11 Troubleshooting - RF CC Technical Documentation GPS Block Diagram IF = 4.092MHz Filter Filter Rx Data Baseband Synthesiser Ref Clk Xtal TRF5101 16.368MHz GPS RF Cellular Baseband © 2005 Nokia Corporation Page 64 Confidential Issue 2 09/2005...

  • Page 65: Gps Rf Schematic

    CC Technical Documentation Troubleshooting - RF GPS RF Schematic GPS RF Chip (N001) Filter 1 (Z001) Filter 2 (Z002) RF Input Circuits located on Bottom Layer Circuits located on Top Layer © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 65...

  • Page 66: Gps Testing

    4. Self-Test Failure: Repeat Steps 1-3 for first failure. If the test still fails, continue. 5. Inspect all GPS circuit elements around D051. If pass visual inspection, then replace D051. © 2005 Nokia Corporation Page 66 Confidential Issue 2 09/2005...
  • Page 67 GPS RF input port (X001). a. Inspect all GPS RF circuit elements. b. Inspect all GPS circuit elements around D051. If all visual inspection looks good, then replace GPS RF IC (N001). © 2005 Nokia Corporation Issue 2 09/2005 Confidential Page 67...
  • Page 68 RM-11 Troubleshooting - RF CC Technical Documentation INSPECT! © 2005 Nokia Corporation Page 68 Confidential Issue 2 09/2005...

  • Page 69: Gps Rf Probing Setup

    3. Continue to the GPS RF Probing Diagram diagram which follows, and measure probe points with either a FET probe and a spectrum analyzer set at center frequency 1575.25MHz, Span = 500kHz, or a voltmeter as specified. © 2005 Nokia Corporation Issue 2 09/2005 Confidential...

  • Page 70: Gps Rf Probing Measurements

    LNA output 1575.25MHz @ -19.5dBm spectrum analyzer 2nd BPF output 1575.25MHz @ -21dBm spectrum analyzer TXCO supply V 2.78V (DC) voltmeter RF_GPS TXCO output 16.368MHz @ +6dBm spectrum analyzer frequency © 2005 Nokia Corporation Page 70 Confidential Issue 2 09/2005...

Table of Contents