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 RA-8

Nokia Customer Care

7 - RF Description and Troubleshooting

20

COMPANY CONFIDENTIAL

Issue 1 11/05

Copyright © 2005 Nokia. All Rights Reserved.

Figure 7: Rx I/Q signal, burst mode, input level –90dBm

•

Receiver I or Q burst mode signal (channel 37) measured from test point RXI 
or RXQ with 942.46771 MHz signal, input level –90dBm at RF-connector.

Correct signal amplitudes approximately:

GSM900~170mVpp
GSM1800~140mVpp
GSM1900~160mVpp

Signal part frequency 67.7kHz sine.
DC level of signal part is 1.35V. DC level can vary about +/-100mV between I 

Summary of Contents for RA-8

Page 1: ...Issue 1 11 05 COMPANY CONFIDENTIAL Copyright 2005 Nokia All Rights Reserved Nokia Customer Care 7 RF Description and Troubleshooting ...

Page 2: ...Issue 1 11 05 COMPANY CONFIDENTIAL 2 Copyright 2005 Nokia All Rights Reserved RA 8 7 RF Description and Troubleshooting Nokia Customer Care This page intentionally blank ...

Page 3: ... 16 RF Troubleshooting 17 Receiver description and troubleshooting 17 Rx front end 17 Antenna 17 Receiver characteristics 18 General instructions for Rx troubleshooting 19 Transmitter description and troubleshooting 26 Power amplifier 26 RF ASIC Honi 26 AFC function 27 Transmitter characteristics 27 General instructions for Tx troubleshooting 27 Additional information for EDGE troubleshooting 34 P...

Page 4: ...RA 8 Nokia Customer Care 7 RF Description and Troubleshooting 4 COMPANY CONFIDENTIAL Issue 1 11 05 Copyright 2005 Nokia All Rights Reserved This page intentionally blank ...

Page 5: ... amplifier module which includes two amplifier chains one for EGSM900 and the oth er for GSM1800 GSM1900 Other key components include 26 MHz VCTCXO for frequency reference 3296 3980 MHz SHF VCO super high frequency voltage controlled oscillator Antenna switch module ASM Three SAW filters BAW LNA module The control information for the RF is coming from the baseband section of the engine through a s...

Page 6: ...7600 G7500 G7501 L7603 L7604 Z7602 L7601 R7601 R7602 R7705 R7710 C7721 C7705 C7706 R7707 R7712 C7516 L7500 C7505 C7506 R7500 R7503 C7702 Z7601 L7602 J7500 RXI J7508 TXC J7501 RXQ J7509 TXQP J7512 TXIP J7511 TXIM J7510 TXQM J7509 TXQP J7512 TXIP J7511 TXIM J7510 TXQM J7503 RFBusClk J7504 RFBusEna1 J7502 RFBusData J7503 RFBusClk J7504 RFBusEna1 J7502 RFBusData J7506 TXA J7505 Reset J7506 TXA J7505 R...

Page 7: ...ight 2005 Nokia All Rights Reserved RA 8 7 RF Description and Troubleshooting Nokia Customer Care Figure 2 Bottom view Test points Table 1 Rx test points Signal name Ref LNAB_P Z7603 LNA_P Z7603 RXI J7500 RXQ J7501 J7507 TXP RF test connection ...

Page 8: ...ni serial interface test points Table 4 Synthesizer test points Table 5 GSM900 Rx Honi input test points Signal name Ref VANT_1 Z7600 VANT_2 Z7600 VANT_3 Z7600 GSM_Rx Z7600 DCS_Rx Z7600 PCS_Rx Z7600 TX_IN_EGSM Z7600 Signal name Ref RFBusClk J7503 RFBusEna1 J7504 RFBusData J7502 Reset J7505 Signal name Ref VCO_out G7500 VCTCXO_out G7501 Ref RX filter Z7601 Inductor L7603 Inductor L7604 ...

Page 9: ...test points Table 7 GSM1900 Rx Honi input test points Table 8 Tx PA input test points Table 9 Tx filter balun input test points Ref Filter Z7602 Inductor L7601 Inductor L7602 Ref BAW LNA Z7603 pin 7 Resistor R7601 Resistor R7602 Signal name Ref Rfin_900 R7705 Rfin_1800 190 R7710 Signal name Ref RfinP_900 C7721 RfinM_900 C7721 RfinP_1800_1900 C7705 RfinM_1800_1900 C7706 ...

Page 10: ... All Rights Reserved Table 10 PA control signal test points Table 11 Rx test points Signal name Ref VPCTRL_900 R7707 VPCTRL_1800_1900 R7712 TXIM J7511 TXIP J7512 TXQM J7510 TXQP J7509 TXC J7508 TXP J7507 test pad TXA J7506 Signal name Ref VR1 VR2 C7516 VR3 L7500 VR4 VR5 C7505 VR6 C7506 VR7 R7500 VrefRF01 R7503 VBAT C7702 ...

Page 11: ... Frequency plan The RF frequency plan is shown below The VCO operates at the channel frequency multiplied by two or four depending on the frequency band of operation This means that the baseband modulated signals are directly converted up to the transmission frequency and the received RF signals directly down to the baseband frequency Figure 3 RF frequency plan HONI ...

Page 12: ...AGC IN OUT f 4 f IN OUT f 4 f RF LO IF RF LO IF IN OUT IN OUT AGC IN OUT AGC RF LO IF RF LO IF RF LO IF RF LO IF IN OUT AGC IN OUT AGC IN OUT TXP TXC IN OUT TXP TXC IN OUT CNTR EGSM900 RXI RXQ 26 Mhz AFC Sys clock Data Clock Enable Reset TXIP TXIM TXQP TXQM TXA TXP TXC 15 dB 15 dB DCS1800 PCS1900 3420 3980 MHz HONI IN OUT AGC 2 1 3 5 4 PCS1900 2 1 3 5 4 IN OUT IN OUT AGC IN OUT AGC IN OUT BIAS IN ...

Page 13: ...the 2 78 V logic directly or through a control reg ister Normally direct control is needed because of switching speed requirement the regula tors are used to enable the RF functions which means that the controls must be fast enough The use of the regulators can be seen in the power distribution diagram which is presented in Figure 6 Power distribution diagram on page 15 The seven regulators are na...

Page 14: ...ts Figure 5 DC power supplies Typical current consumption The table shows the typical current consumption in different operation modes Operation mode Current consumption Notes Power OFF 10 uA Leakage current triple band PA Rx EGSM900 75 mA peak Rx GSM1800 GSM1900 70 mA peak Tx power level 5 EGSM900 1700 mA peak Tx power level 0 GSM1800 GSM1900 1000 mA peak ...

Page 15: ...1 05 COMPANY CONFIDENTIAL 15 Copyright 2005 Nokia All Rights Reserved RA 8 7 RF Description and Troubleshooting Nokia Customer Care Power distribution diagram Figure 6 Power distribution diagram Honi LNA GSM1900 ...

Page 16: ...ights Reserved RF characteristics Channel numbers and frequencies System Channel number TX frequency RX frequency Unit EGSM 0 n 124 F 890 0 2 n F 935 0 2 n MHz 975 n 1023 F 890 0 2 n 1024 F 935 0 2 n 1024 MHz DCS1800 512 n 885 F 1710 2 0 2 n 512 F 1805 2 0 2 n 512 MHz PCS1900 512 n 810 F 1850 2 0 2 n 512 F 1930 2 0 2 n 512 MHz ...

Page 17: ...a lot of discrete components resistors inductors and capacitors of which troubleshooting is done by checking if the solder ing of the component is done properly for factory repairs checking if it is missing from the PWB You can check capacitors for shortening and resistors for value by means of an ohm meter but be aware in circuit measurements should be evaluated carefully Please be aware that all...

Page 18: ... 3760 MHz 3860 3980 MHz Typical 3 dB bandwidth 91 kHz Sensitivity min 102 dBm Total typical receiver voltage gain from antenna to RX ADC 86 dB Receiver output level RF level 95 dBm 230 mVpp single ended I Q signals to RX ADCs Typical AGC dynamic range 83 dB Accurate AGC control range 60 dB Typical AGC step in LNA 30 dB GSM1800 GSM1900 25 dB GSM900 Usable input dynamic range 102 10 dBm RSSI dynamic...

Page 19: ...driver when using FPS 8 7 From the File menu choose Choose Product 8 From the list select RA 8 9 From the toolbar set operating mode to Local 10 From the Testing menu choose RF Controls 11 In the RF Controls window Select band GSM 900 GSM 1800 or GSM1900 Default GSM900 Set Active unit to Rx Default Rx Set Operation mode to Burst Default Burst For continuous mode Set Operation mode to Continuous Se...

Page 20: ... burst mode input level 90dBm Receiver I or Q burst mode signal channel 37 measured from test point RXI or RXQ with 942 46771 MHz signal input level 90dBm at RF connector Correct signal amplitudes approximately GSM900 170mVpp GSM1800 140mVpp GSM1900 160mVpp Signal part frequency 67 7kHz sine DC level of signal part is 1 35V DC level can vary about 100mV between I ...

Page 21: ...nt bands as well GSM1900 receiver burst mode I or Q signal at ch 661 with input signal 1960 067MHz level 90 dBm at RF connector Trace2 With wider time scaling both monitoring and own Rx bursts are seen 1st burst shorter is monitoring and 2nd burst longer is own Rx burst Trace1 External LNA VCC supply voltage at burst mode input level 90 dBm Measured from test point LNA_VCC ...

Page 22: ...served Figure 8 GSM1900 Rx I or Q signal trace2 burst mode Detailed view of GSM900 continuous mode Rx I and Q signals measured from test points RXI and RXQ simultaneously Used channel 37 input signal 942 46771 MHz level 90 dBm at antenna port AGC setting 12 Phase difference should be 90 degrees between Rx I and Q signals at all bands ...

Page 23: ...opyright 2005 Nokia All Rights Reserved RA 8 7 RF Description and Troubleshooting Nokia Customer Care Troubleshooting diagram for GSM900 receiver Phone in Continuous mode AGC setting 12 Check Z7601 L7603 L7604 Z7600 HONI HONI HONI HONI HONI ...

Page 24: ...ption and Troubleshooting 24 COMPANY CONFIDENTIAL Issue 1 11 05 Copyright 2005 Nokia All Rights Reserved Troubleshooting diagram for GSM1800 receiver Phone in Continuous mode AGC setting 12 HONI HONI HONI HONI HONI Z7602 L7601 L7602 Z7600 ...

Page 25: ...ights Reserved RA 8 7 RF Description and Troubleshooting Nokia Customer Care Troubleshooting diagram for GSM1900 receiver Phone in Continuous mode AGC setting 12 HONI HONI Z7600 Check Z7603 R7601 R7602 L7600 LNAB_P 2 6V LNA_P 0V HONI HONI Check Z7603 HONI HONI HONI ...

Page 26: ...odule with a power detector In the GMSK mode the power is controlled by adjusting the DC bias levels of the power amplifi ers Power amplifier The power amplifier features include 50 ohm input and output EGSM900 GSM1800 GSM1900 internal power detector EDGE mode Figure 9 Power amplifier RF ASIC Honi The RF ASIC features include Package LFGBGA88 Balanced I Q demodulator and balanced I Q modulator Pow...

Page 27: ...repairing or tuning the transmitter use external DC supply with at least 3A current capability Set the DC supply voltage to 3 9V and set the jumper connec tor on test jig to bypass position 3 Connect an RF cable to the RF connector of the module test jig MJ 83 and measurement equipment or at least a 10dB attenuator otherwise the PA may be damaged Use a spectrum analyzer as measurement equipment No...

Page 28: ...From the toolbar set operating mode to Local 8 From the Testing menu choose RF Controls 9 In the RF Controls window Select band GSM900 or GSM 1800 or GSM1900 Default GSM900 Set Active unit to Tx Default Rx Set Operation mode to Burst Default Burst Set Tx data type to Random Default All1 Set Rx Tx channel to 37 on GSM900 band or 700 on GSM1800 band or 661 on GSM1900 Defaults Set Tx PA mode to Free ...

Page 29: ...Issue 1 11 05 COMPANY CONFIDENTIAL 29 Copyright 2005 Nokia All Rights Reserved RA 8 7 RF Description and Troubleshooting Nokia Customer Care Transmitter troubleshooting diagram Replace Honi Honi ...

Page 30: ...tomer Care 7 RF Description and Troubleshooting 30 COMPANY CONFIDENTIAL Issue 1 11 05 Copyright 2005 Nokia All Rights Reserved Honi IC troubleshooting diagram Replace Honi Honi VR2 VR5 VR6 2 8V Honi serial interface ...

Page 31: ...Issue 1 11 05 COMPANY CONFIDENTIAL 31 Copyright 2005 Nokia All Rights Reserved RA 8 7 RF Description and Troubleshooting Nokia Customer Care PA and antenna switch troubleshooting diagram Honi ...

Page 32: ...a All Rights Reserved Pictures of transmitter signals VPCTRL 850 900 power level 5 at R7703 C7703 VPCRTL_1800 1900 power level 0 at R7704 C7704 VTXB 850 900 at C7713 VTXB_1800 1900 at C7714 VANT_1 at C7805 VANT_2 at C7804 VANT_3 at C7538 TXI TXQ TX signals at R7516 R7515 C7535 C7536 I TXC 850 900 power level 5 at R7522 ...

Page 33: ...Issue 1 11 05 COMPANY CONFIDENTIAL 33 Copyright 2005 Nokia All Rights Reserved RA 8 7 RF Description and Troubleshooting Nokia Customer Care Figure 10 Tx out signal 900 band burst mode channel 37 ...

Page 34: ...elect RA 8 from the list or from the File menu choose Scan Product 3 From the toolbar set operating mode to Local 4 From the Testing menu choose RF Controls 5 In the RF Controls window Select Band GSM900 or GSM1800 or GSM1900 Default GSM900 Set Active unit to Tx Default Rx Set Edge On Default Off Set Operation mode to Burst Default Burst Set Tx data type to Alternate PN9 Default All1 Set Rx Tx cha...

Page 35: ...ssue 1 11 05 COMPANY CONFIDENTIAL 35 Copyright 2005 Nokia All Rights Reserved RA 8 7 RF Description and Troubleshooting Nokia Customer Care Transmitter EDGE troubleshooting diagram Replace HONI Honi EDGE ...

Page 36: ...gnals VR1 VR2 VR4 VR5 VR6 2 8V VrefRF01 1 35V Helgo serial interface TXP TXC TXA OK Baseband troubleshooting Check with RF probe 4G VCO signal output 3589 6MHz GSM900 3495 6MHz GSM1800 3760MHz GSM1900 Level 10dBm OK Synthesizer troubleshooting Check modulator output components OK Replace HELGO Replace faulty component s 3346 4MHz GSM850 3589 6MHz GSM900 3495 6MHz GSM1800 3760MHz GSM1900 Level 10dB...

Page 37: ...Issue 1 11 05 COMPANY CONFIDENTIAL 37 Copyright 2005 Nokia All Rights Reserved RA 8 7 RF Description and Troubleshooting Nokia Customer Care PA and antenna switch EDGE troubleshooting diagram HONI ...

Page 38: ...on and Troubleshooting 38 COMPANY CONFIDENTIAL Issue 1 11 05 Copyright 2005 Nokia All Rights Reserved Pictures of EDGE transmitter signals Figure 11 I_ref_1800 1900 power level 2 at R7700 C7700 Figure 12 VTXB 1800 1900 power level 2 at C7714 ...

Page 39: ...COMPANY CONFIDENTIAL 39 Copyright 2005 Nokia All Rights Reserved RA 8 7 RF Description and Troubleshooting Nokia Customer Care Figure 13 TXI TXQ signal at C7535 C7536 R7516 R7517 Figure 14 TXA 900 1800 1900 at C7538 ...

Page 40: ...omer Care 7 RF Description and Troubleshooting 40 COMPANY CONFIDENTIAL Issue 1 11 05 Copyright 2005 Nokia All Rights Reserved Figure 15 VTXB 900 power level 8 at C7713 Figure 16 I_ref 900 power level 8 at R7701 C7701 ...

Page 41: ...Issue 1 11 05 COMPANY CONFIDENTIAL 41 Copyright 2005 Nokia All Rights Reserved RA 8 7 RF Description and Troubleshooting Nokia Customer Care Figure 17 TXC 900 power level 8 at 7522 ...

Page 42: ...r is integrated in Honi except for the VCTCXO VCO and the loop filter General instructions for synthesizer troubleshooting To start synthesizer troubleshooting 1 Connect the test jig MJ 83 to a computer with a DAU 9S cable or to an FPS 8 flash prommer with an XCS 4 modular cable Make sure that you have a PKD 1 dongle connected to the computer s parallel port 2 Connect a DC power supply or FPS 8 to...

Page 43: ...y filter components C2232 C7590 Check UEM and SW Oscilloscope VCO supply VR7 2 78V VR5 2 78V VR1 4 7V Spectrum analyzer VCO G7500 out Some signal 3 4 4 GHz Check VCO G7500 Balun T7500 Check loop filter components C7503 C7504 C7505 R7501 R7502 Wrong writing on RFBus see BB part If ok change RF ASIC N7500 Check supply filter components R7500 C7501 C7560 C2230 C7551 C7552 C7553 Check UEM and Software...

Page 44: ... Care 7 RF Description and Troubleshooting 44 COMPANY CONFIDENTIAL Issue 1 11 05 Copyright 2005 Nokia All Rights Reserved Pictures of synthesizer signals Figure 18 26MHz at G501 pin out Figure 19 26MHz RFCLK at R420 C420 ...

Page 45: ... COMPANY CONFIDENTIAL 45 Copyright 2005 Nokia All Rights Reserved RA 8 7 RF Description and Troubleshooting Nokia Customer Care Figure 20 1800 Tx channel 512 burst mode Figure 21 1900 Rx channel 810 continuous mode ...

Page 46: ...okia All Rights Reserved Figure 22 VCO output 1800 band ch700 Rx on continuous output A Unit dBm RBW 10 kHz SWT 25 ms VBW 10 kHz Ref Lvl 12 dBm Ref Lvl 12 dBm RF Att 10 dB 100 kHz Center 3 6856 GHz Span 1 MHz 1VIEW 1MA 100 90 80 70 60 50 40 30 20 112 12 1 Marker 1 T1 15 59 dBm 3 68560301 GHz Date 29 APR 2003 13 41 26 ...

Page 47: ...89 907 8 952 8 3631 2 3811 2 1002 885 6 930 6 3542 4 3722 4 28 895 6 940 6 3582 4 3762 4 90 908 0 953 0 3632 0 3812 0 1003 885 8 930 8 3543 2 3723 2 29 895 8 940 8 3583 2 3763 2 91 908 2 953 2 3632 8 3812 8 1004 886 0 931 0 3544 0 3724 0 30 896 0 941 0 3584 0 3764 0 92 908 4 953 4 3633 6 3813 6 1005 886 2 931 2 3544 8 3724 8 31 896 2 941 2 3584 8 3764 8 93 908 6 953 6 3634 4 3814 4 1006 886 4 931 ...

Page 48: ...7 0 3544 0 3734 0 540 1715 8 1810 8 3431 6 3621 6 634 1734 6 1829 6 3469 2 3659 2 728 1753 4 1848 4 3506 8 3696 8 822 1772 2 1867 2 3544 4 3734 4 541 1716 0 1811 0 3432 0 3622 0 635 1734 8 1829 8 3469 6 3659 6 729 1753 6 1848 6 3507 2 3697 2 823 1772 4 1867 4 3544 8 3734 8 542 1716 2 1811 2 3432 4 3622 4 636 1735 0 1830 0 3470 0 3660 0 730 1753 8 1848 8 3507 6 3697 6 824 1772 6 1867 6 3545 2 3735 ...

Page 49: ... 3747 6 3907 6 724 1892 6 1972 6 3785 2 3945 2 537 1855 2 1935 2 3710 4 3870 4 631 1874 0 1954 0 3748 0 3908 0 725 1892 8 1972 8 3785 6 3945 6 538 1855 4 1935 4 3710 8 3870 8 632 1874 2 1954 2 3748 4 3908 4 726 1893 0 1973 0 3786 0 3946 0 539 1855 6 1935 6 3711 2 3871 2 633 1874 4 1954 4 3748 8 3908 8 727 1893 2 1973 2 3786 4 3946 4 540 1855 8 1935 8 3711 6 3871 6 634 1874 6 1954 6 3749 2 3909 2 7...

Page 50: ...eplacements around the modulator area RF path from UEM via RF ASIC to RF PA have been done Tx IQ Tuning is additionally required In general Rx repairs the front end always requires Rx Calibration and Rx Band Filter Calibration for all three bands Repairs in the PLL circuit always require Rx Calibration of the low band If the RF ASIC is replaced all calibrations mentioned above have to be done Refe...

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