Nokia RH-47 Series Rf Description And Troubleshooting

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Nokia Customer Care

RH-47 Series Cellular Phones

7 - RF Description and

Troubleshooting

Issue 1 05/04

Company Confidential

Table of Contents

Troubleshooting

Summary of Contents for Nokia RH-47 Series

Page 3: Table Of Contents
DC Supply Current Check ........................42 Phoenix Tunings after Repairs ......................43 APPENDIX A: FLALI Test Cases with Hints for Repair..............44 APPENDIX B: FINUI Test Cases with Hints for Repair ..............50 Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 3 Company Confidential...
Page 4 Setting cable loss for Auto-Tuning ....................71 Setting DA-17/JXS-2 calibration loss ...................72 Assigning the product to the jig ....................73 GPIB Setup for Autotuning ......................73 Autotuning ............................74 Bluetooth test setup ..........................75 Bluetooth testing ..........................75 Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 4 Company Confidential...
Page 5: Abbreviations
HSCSD High Speed Circuit Switched Data Low Noise Amplifier Local Oscillator Power Amplifier Printed Wired Board Phase Locked Loop Radio Frequency Receiver Spectrum Analyzer Transmitter Voltage Controlled Oscillator Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 5 Company Confidential...
Page 6: Introduction To Rf
The phone supports GPRS (General Packet Radio Service), meaning multi-slot operation. This will not require special equipment or procedures in repair situations. The following diagrams show the RF frequency scheme and the RF block diagram. Copyright © 2004 Nokia Corporation Page 6 Issue 1 05/04...
Page 7 7 - RF Description and Troubleshooting Figure 1: RF frequency scheme 869 - 894 1930 - 1990 3296 - 3980 26 MHz BB clk 824 - 849 1850 - 1910 Mjoelner Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 7 Company Confidential...
Page 9: Rf Power Supply Configuration
The power supply configuration used is shown in the block diagram below. Values of voltages are given as nominal outputs of UEM. Currents are typical values. Figure 3: RF power distribution diagram Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 9...
Page 10: General Specifications Of Transceiver Rh-47
Sensitivity, static channel GSM850: -102 dBm GSM1900: -102 dBm Frequency Error, static channel < 0.1 ppm RMS Phase Error < 5.0 ° Peak Phase Error < |20.0 °| Copyright © 2004 Nokia Corporation Page 10 Issue 1 05/04 Company Confidential...
Page 11: Introduction To Rf Troubleshooting
In the following GSM850 will be used for the low band, and PCS or GSM1900 for the high band. Note: In this document there are example measurements being depicted with Phoenix Internal Service Software A2003.42.1.48 pictures. Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 11 Company Confidential...
Page 12: Printed Wired Board
Mjölner RF ASIC F7 (N601) 4380013 Infineon BT202i (N430) 0700085 Murata UHF VCO (G701) ENFVJSW2S08 4350431 Matsushita UHF VCO Balun (T702) LDB213G6010C-001 4550187 Murata 1900 Tx Balun (T701) LDB211G8005C-001 4550191 Murata Copyright © 2004 Nokia Corporation Page 12 Issue 1 05/04 Company Confidential...
Page 13: Rf Test Points
The RF power supplies are generated in the UEM and can be measured either in the Mjoelner chamber or in the base band chamber. On the drawing below small circles show the locations of the test points. Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 13...
Page 14: Test Points Rf Supply Voltages
RH-47 Company Confidential 7 - RF Description and Troubleshooting Nokia Customer Care Test points RF supply voltages Copyright © 2004 Nokia Corporation Page 14 Issue 1 05/04 Company Confidential...
Page 15: Rf Test Points Mjoelner Chamber
Company Confidential RH-47 Nokia Customer Care 7 - RF Description and Troubleshooting RF test points Mjoelner chamber RF test points VCO chamber Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 15 Company Confidential...
Page 16: Rf Test Points Pa Chamber
Nokia Customer Care RF test points PA chamber Test points BB area J203 TXQD J203 TXQD J201 RXQD J201 RXQD J202 TXID J202 TXID J200 RXID J200 RXID Copyright © 2004 Nokia Corporation Page 16 Issue 1 05/04 Company Confidential...
Page 17: Receiver Troubleshooting
Wait until the RF Controls window pops up. 3 In the RF Controls window: Select Band GSM850 or GSM1900 Active unit Burst Operation mode RX/TX Channel 190 or 661 Select Maintenance Alt-M Testing RSSI reading Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 17 Company Confidential...
Page 18: Measuring Rx Performance Using Snr Measurement
1 Start Phoenix Service Software and open FBUS connection. Select Scan Product Ctrl-R Wait until phone information is shown in the lower right corner of the screen. 2 Set operating mode to local mode. Copyright © 2004 Nokia Corporation Page 18 Issue 1 05/04 Company Confidential...
Page 19 4 Press the Start button. 5 To continue, follow the instructions in the following pop-up windows. 6 Connect an external signal generator to the RF connector of the phone and set Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 19...
Page 20: Measuring Front-End Power Levels Using Spectrum Analyzer
Wait until phone information is shown in the lower right corner of the screen. 2 Set operating mode to local mode: Select Maintenance Alt-M Testing RF Controls Wait until the RF Controls window pops up 3 In the RF Controls window: Copyright © 2004 Nokia Corporation Page 20 Issue 1 05/04 Company Confidential...
Page 21: Measuring Analogue Rx I/Q Signals Using Oscilloscope
Select Band GSM850 or GSM1900 Active unit Continuous Operation mode RX/TX Channel 190 or 661 Following picture should be displayed on an oscilloscope' s screen if the GSM850 Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 21 Company Confidential...
Page 22: Receiver Troubleshooting
If you are not sure that incorrect re-calibration has been made, the following steps should be done: 1 Check if AGC calibration is within limits. Copyright © 2004 Nokia Corporation Page 22 Issue 1 05/04 Company Confidential...
Page 23: Rx Signal Paths
Rx signal paths The signal paths of the receiver are shown in following block diagram. Note that the dia- gram shows GSM850 receiver (above) and the GSM1900 receiver (below). Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 23 Company Confidential...
Page 24: Antenna Switch (Rx/Tx Switch)
The integrated LNAs provide the front-end gains. Each of the SAW filters has a single-ended input and a balanced output. The SAW filters have maximum insertion losses of: GSM850: 3.5dB GSM1900: 4.0dB Copyright © 2004 Nokia Corporation Page 24 Issue 1 05/04 Company Confidential...
Page 25: Rx Paths Of Mjoelner Rf Asic
The differential base band outputs are internally DC-coupled and are connected directly to the ADC inputs of the UEM-ASIC. The common mode level is set equal to the VBEXT reference voltage. Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 25...
Page 26: Transmitter
For easy error tracking it is important to know the signal paths of the transmitter. The components are grouped in blocks and shown in the diagrams below. Note that the diagram shows both GSM850 transmitter (below) and PCS1900 transmit- ter (above). Copyright © 2004 Nokia Corporation Page 26 Issue 1 05/04 Company Confidential...
Page 27 The RF output power is controlled by the power control loop. From the output of the PA both signals are fed through a dual directional coupler (one of the power control loop components) to the antenna switch. Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 27...
Page 28: Antenna Switch (Tx/Rx Switch)
Wait until the RF Controls window pops up. 2 In the RF Controls window: Select Band GSM850 Active unit Operation mode Burst RX/TX Channel TX Power Level TX Data Type Random Copyright © 2004 Nokia Corporation Page 28 Issue 1 05/04 Company Confidential...
Page 29: Troubleshooting For Gsm850 Transmitter
In the following troubleshooting chart, the TXP signal is used as a trigger-signal. For this purpose a TXP test point is provided on the PWB, refer to figure RF test points in the Mjoelner chamber. Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 29...
Page 30 Power >= +24 dBm, 836.6 Check TXC Spectrum analyzer Check RF-connector J800 Directional Coupler (L801) Pout Antenna Switch (Z601) = +23 dBm, 836.6 MHz LPF (C742,743,L610) GSM TX Copyright © 2004 Nokia Corporation Page 30 Issue 1 05/04 Company Confidential...
Page 31: Gsm1900 (Pcs) Transmitter
Now the measurement equipment should detect the following output signal of the phone: = +20 ± 1dBm @ 1880MHz If this is not the case, then go to the next chapter for troubleshooting. Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 31 Company Confidential...
Page 32: Troubleshooting For Gsm1900 Transmitter
In the following troubleshooting chart, the TXP signal is used as a trigger-signal. For this purpose a TXP test point is provided on the PWB, refer to RF test points in the Mjoelner chamber. Copyright © 2004 Nokia Corporation Page 32 Issue 1 05/04...
Page 33 N801 Pout_DCS) L801,V801 Power = +22 dBm, 1880 Check TXC Spectrum analyzer Check RF-connector J800 Directional Coupler (L801) Pout =+20 dBm, 1880 Antenna Switch (Z601) LPF (C742,743,L610) PCS TX Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 33 Company Confidential...
Page 34 RH-47 Company Confidential 7 - RF Description and Troubleshooting Nokia Customer Care Figure 7: Example for TXP and TXC signal waveform (PCS1900 @ PL19) Copyright © 2004 Nokia Corporation Page 34 Issue 1 05/04 Company Confidential...
Page 35: Synthesizer
RF Controls Wait until the RF Controls window pops up. 4 Set the synthesizer to the following mode: Select Band PCS1900 Active unit Operation mode Continuous RX/TX Channel Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 35 Company Confidential...
Page 36: 26 Mhz Reference Oscillator (Vcxo)
RefOSCCAL register of Mjoelner and an additional bit in the RefOSCCntl register of the Mjoelner. That is necessary for the rough calibration of the VCXO. The VCXO is fine tuned by programming the AFC value via the serial bus of Mjoelner. The Copyright © 2004 Nokia Corporation Page 36 Issue 1 05/04...
Page 37: Vco
It is important to note that the power supply of the VCXO (VR3) is only switched off in the so-called ‘Deep Sleep Mode’ and the power supply of the VCO G701 (VR7) is switched off in so-called ‘Sleep Mode’. Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 37...
Page 38 RH-47 Company Confidential 7 - RF Description and Troubleshooting Nokia Customer Care Figure 8: PLL block diagram Copyright © 2004 Nokia Corporation Page 38 Issue 1 05/04 Company Confidential...
Page 39: Frequency Lists
3343,2 3523,2 848,2 893,2 3392,8 3572,8 3344 3524 848,4 893,4 3393,6 3573,6 836,2 881,2 3344,8 3524,8 848,6 893,6 3394,4 3574,4 836,4 881,4 3345,6 3525,6 848,8 893,8 3395,2 3575,2 Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 39 Company Confidential...
Page 40: Gsm1900
1899,0 1979,0 3798,0 3958,0 1861,6 1941,6 3723,2 3883,2 1880,4 1960,4 3760,8 3920,8 1899,2 1979,2 3798,4 3958,4 1861,8 1941,8 3723,6 3883,6 1880,6 1960,6 3761,2 3921,2 1899,4 1979,4 3798,8 3958,8 Copyright © 2004 Nokia Corporation Page 40 Issue 1 05/04 Company Confidential...
Page 41 1906,0 1986,0 3812,0 3972,0 1868,6 1948,6 3737,2 3897,2 1887,4 1967,4 3774,8 3934,8 1906,2 1986,2 3812,4 3972,4 1868,8 1948,8 3737,6 3897,6 1887,6 1967,6 3775,2 3935,2 1906,4 1986,4 3812,8 3972,8 Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 41 Company Confidential...
Page 42: Dc Supply Current Check
For a quick check of DC power supplies refer to the diagram below. Voltage drops are measured at the respective resistors pads. Note, that not all currents can be checked in such a way, see the marking <na> (not applicable) in the diagram. Copyright © 2004 Nokia Corporation Page 42 Issue 1 05/04...
Page 43: Phoenix Tunings After Repairs
• If the RF ASIC is replaced, all calibrations mentioned above have to be done. Refer to Chapter 3, Service Software Instructions, for instructions on the above-men- tioned tunings. Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 43 Company Confidential...
Page 44: Appendix A: Flali Test Cases With Hints For Repair
Check_VBATGScalV 10000 11000 Check_VBATOffScal 2400 2600 Check_BSICalGain 1180 Check_BTEMPValue Check_VCXOTEMPValue Check_ADCCalGain 26000 29500 Check_ADCCalVOff MainSequence Check_MCU_SW_Version Select_PCI_Layer Action Check_RFIC String Val- ueTest Set_Zocus_Cal_Current Action Tune_Channel_Select_Filter Check RXIQ Signals Copyright © 2004 Nokia Corporation Page 44 Issue 1 05/04 Company Confidential...
Page 45 RSSI is 6-10dB too low, change Z603 Check_GSM1900_RSSI_3 If no signal, check RX path up to RXIQ inter- face. If RXIQ not ok, check N601, If RXIQ ok, check BB Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 45 Company Confidential...
Page 46 If one of the steps 64- SM1900_Rx_Filte 72 fails, change RX1900 SAW Z603 Check_GSM1900_Rx_Filter Also consider the RF _First calibration of the FLALI Check_GSM1900_Rx_Filter Check_GSM1900_Rx_Filter Check_GSM1900_Rx_Filter Check_GSM1900_Rx_Filter Check_GSM1900_Rx_Filter Copyright © 2004 Nokia Corporation Page 46 Issue 1 05/04 Company Confidential...
Page 47 This includes the fol- lowing groups: Check_GSM1900_Base_Lev 1900 Modulator and el_Coef 1900 TX Balun Set_SA_GSM1900_Tx_Powe Action PA circuit r_Tuning Measure_GSM1900_Tuning Action Power control loop _Samples and Antenna switch Tune_GSM1900_Tx_Power Action Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 47 Company Confidential...
Page 48 Tune_GSM850_IQ_Phase_Di fference_2 Measure_GSM850_TX_IQ Action Check_GSM850_TX_IQ_f0 -120 Check_GSM850_TX_IQ_f0_ -120 +67710 Seq_Tune_GSM1 Set_SA_1900_TX_IQ_Tunin Action Check TX1900 path 900_Tx_ IQ aroung the modulator (L705, C734, C735, T701, L712, C721, C722) Tune_GSM1900_I_DC_Offse Copyright © 2004 Nokia Corporation Page 48 Issue 1 05/04 Company Confidential...
Page 49 Tune_GSM1900_IQ_Phase_ Difference Tune_GSM1900_IQ_Amplit -1,2 Maybe Mjölner N601 ude_Difference must be replaced Tune_GSM1900_IQ_Phase_ Difference_2 Measure_GSM1900_TX_IQ Action Check_GSM1900_TX_IQ_f0 -120 Check_GSM1900_TX_IQ_f0 -120 _+67710 MainSequence MMC_test Selftest_A Measure_GSM850_Tx_On_ Current Measure_GSM1900_Tx_On _Current Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 49 Company Confidential...
Page 50: Appendix B: Finui Test Cases With Hints For Repair
Meas Vibra Cur- rent Check Keypad func Audio Robot Move To MIC Measure XEAR- >MIC @1kHz Move robot On -0,5 the Earp Measure EAR- >XMIC @1kHz Move robot Home -0,5 Copyright © 2004 Nokia Corporation Page 50 Issue 1 05/04 Company Confidential...
Page 51 GSM850 WaitForService MS GSM850 MS Originated PassFailTest Call Test GSM850 GSM850 High Handoff to GSM850 C=H TxL=5 Meas GSM850 All 1000 C=H TxL=5 GSM850 POWER BURST C=H TxL=5 Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 51 Company Confidential...
Page 52 GSM850 Mod -100 Check Buffer Cir- Spectra -400Khz cuit around V802 C=H TxL=5 GSM850 BER - Check antenna 102 C=H TxL=5 connection, check Filter C742, C743 and L610 Copyright © 2004 Nokia Corporation Page 52 Issue 1 05/04 Company Confidential...
Page 53 GSM850 BURST t=12 C=H TxL=19 GSM850 Low Handoff to GSM850 C=L TxL=5 Meas GSM850 All 1000 C=L TxL=5 GSM850 POWER Check shielding BURST C=L TxL=5 and antenna con- nection Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 53 Company Confidential...
Page 54 GSM850 Ramp- Check C715 and ing Spectra - C716 for correct 400Khz C=M soldering TxL=5 GSM850 Mod -100 Check Buffer Cir- Spectra +400Khz cuit around V802 C=M TxL=5 Copyright © 2004 Nokia Corporation Page 54 Issue 1 05/04 Company Confidential...
Page 55 PCS1900 Ramp- Check C715 and ing Spectra - C716 for correct 400Khz C=H soldering TxL=0 PCS1900 Mod Check TX1900 Spectra +400Khz MHZ path (T701 C=H TxL=0 and surrounding components) Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 55 Company Confidential...
Page 56 C=H TxL=15 components near Mjölner: R708,R707, R706,C706, PCS1900 BURST or C831. t=4 C=H TxL=15 PCS1900 BURST t=9 C=H TxL=15 PCS1900 BURST t=11 C=H TxL=15 PCS1900 BURST t=12 C=H TxL=15 Copyright © 2004 Nokia Corporation Page 56 Issue 1 05/04 Company Confidential...
Page 57 PCS1900 PHASE Check the follow- ERR PEAK C=M ing capacitors for TxL=0 correct soldering: PCS1900 Ramp- C610, C740, C741, ing Spectra C626, C710, C711, +400Khz C=M C712, TxL=5 Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 57 Company Confidential...
Page 58 Spectra -400Khz MHZ path (T701 C=M TxL=5 and surrounding components) MainSequence EndCall Action Meas Vibra (Sen- dB(S sor) SNR_3 SelfTest C Sleep Mode Cur- rent Off Mode Current -0,2 Copyright © 2004 Nokia Corporation Page 58 Issue 1 05/04 Company Confidential...
Page 59: Appendix C: Component Placement With Test Points & Detailed Description
APPENDIX C: Component Placement with Test Points & Detailed Description See 4 pages with Synthesizer Test Points (1 page) Receiver Test Points (1 page) Transmitter Test Points (2 pages) Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 59 Company Confidential...
Page 65: Appendix D: Calibration Of The Da-17/Jxs-2 Jig, Autotuning And Bt Testing
• The best accuracy is achieved for the highest TX power level (PCL0 / PCL5). Calibration procedure setup MJ-21 The initial setup is shown below. The phone is disassembled and the engine PWB is Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 65...
Page 66: Data Acquisition Mj-21
The measurement is done in local mode. TX power is measured in the Zero Span mode with RBW being 3MHz or more. The RBW value also depends on the RF analyser used. Copyright © 2004 Nokia Corporation Page 66 Issue 1 05/04...
Page 67: Tx Power Measurement
Align the phone exactly to 32.5 dBm using the “+” and “-” keys. 3 Click the “Save & Continue” button - RF analyser set to mid channel (190) 836.6MHz - Zero-Span - RBW >=3MHz - Video Trigger - RMS power Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 67 Company Confidential...
Page 68: Gsm1900 Power Measurement
H igh [M H z] G SM 850 869,26771 881,66771 893,86771 G SM 1900 R X 1930,26771 1960,06771 1989,86771 MJ-21 RSSI procedure 1 Start the phone in Local mode. Copyright © 2004 Nokia Corporation Page 68 Issue 1 05/04 Company Confidential...
Page 69: Rssi Values
Set the RF generator power to –60dBm (taking into account the losses caused by cables and MJ-21 jig mentioned before) and frequencies from the table. Perform the measurement on Low, Mid and High channels on both bands. Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 69...
Page 70: Example Figures
The shielded box has to be closed for all RF measurements. The same parameters must be measured as for MJ-21. Follow the instructions given ear- lier. • TX Power on MID channel (GSM850 PCL=5, GSM1900 PCL=0) Copyright © 2004 Nokia Corporation Page 70 Issue 1 05/04 Company Confidential...
Page 71: 17/Jxs-2 Example Figures
1 From the Tuning menu, choose Set Loss. 2 Enter the cable losses (incl. Power splitter if used) for GSM850 at 824 and 894 MHz and for GSM1900 at 1850 and 1990 MHz. Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 71...
Page 72: Setting Da-17/Jxs-2 Calibration Loss
1 Enter the calibration factors (DA-17 values subtracted from the MJ-21 values) to the Jig column. Note that there are different calibration factors for the TX and RX channels Copyright © 2004 Nokia Corporation Page 72 Issue 1 05/04 Company Confidential...
Page 73: Assigning The Product To The Jig
4 First click Save and then Close. You are ready for Autotuning. GPIB Setup for Autotuning Prerequisites: • GPIB card on Phoenix PC must be installed and working. Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 73 Company Confidential...
Page 74: Autotuning
• R&S FSx series • Agilent PSA/VSA Use different GPIB address for different devices! Autotuning Procedure: 1 To start tuning the phone in the DA-17/JXS-2 box, choose Auto-Tune from the Copyright © 2004 Nokia Corporation Page 74 Issue 1 05/04 Company Confidential...
Page 75: Bluetooth Test Setup
Bluetooth test setup DA-17 Bluetooth coupler is connected to RF I/O via a 30 dB attenuator Bluetooth testing Procedure: 1 From the “Operating mode” dropdown menu, choose Test. Copyright © 2004 Nokia Corporation Issue 1 05/04 Page 75 Company Confidential...
Page 76 4 Enter the BD address of BT Box 2 on the “Counterpart BT Device Address” line. BER must be <0.1%. 5 Click the “Run BER Test” button and wait approximately 2 seconds for the result. Copyright © 2004 Nokia Corporation Page 76 Issue 1 05/04...

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