Nokia Customer Care 6(b) - RF Troubleshooting Instructions Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting Instructions This page has been intentionally left blank. 2 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
RM-94 6(b) - RF Troubleshooting Instructions Nokia Customer Care Table of Contents Page No General Information on RF Troubleshooting ................................................... 5 Test environment ............................................................................................... 5 Test conditions................................................................................................... 5 Receiver Verification and Troubleshooting .................................................
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting Instructions This page has been intentionally left blank. 4 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
RM-94 6(b) - RF Troubleshooting Nokia Customer Care General Information on RF Troubleshooting Notes: Several bills of material (BOM): There are two different kinds of VCOs, VCTXOs, RF-PAs, SAWfilters and Antenna Switches (ASM) assembled. They may only be replaced with the same type as the original component (from the same manufacturer). Phoenix version: In this document there are example measurements being depicted with pictures of AMS-Phoenix, version A 2004.06.1.69.
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting Most RF semiconductors are static discharge sensitive. ESD protection must be taken into account during repair (ground straps and ESD soldering irons). The RF ASIC Helgo is moisture sensitive. Therefore, the ASIC must be pre-baked prior to soldering. 6 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
RM-94 6(b) - RF Troubleshooting Nokia Customer Care Receiver Verification and Troubleshooting ■ General instructions for RX troubleshooting Connect the phone to a PC, which has Phoenix Service Software and a dongle installed, using either • repair jig and DAU-9S (RS232) cable or • repair jig and XCS-4 cable via FPS-8 Flash Box or • DAU-9T cable (RS232). Connect the phone to a power supply (DC voltage: 3.6V, max. current: 3A) and an RF signal generator. Switch the phone on.
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting (The example below shows a screen shot in GSM900!) Make the following settings on your signal generator: Frequencies: • GSM 900: 942.46771 MHz (channel 37+ 67.710 kHz offset) • GSM 1800: 842.86771 MHz (channel 700 + 67.710 kHz offset) • GSM 1900: 1960.06771 MHz (channel 661+ 67.710 kHz offset) RF power level: • – 80 dBm @ the antenna connector of the phone/ test jig (remembering to compensate for the cable and jig attenuation).
RM-94 6(b) - RF Troubleshooting Select Nokia Customer Care Operation mode Burst RX/TX Channel 37 or 700 or 661 Testing T SNR Measurement Select Measuring mode Press Start M Fast SNR (Radio Button) The window pops up informing on frequency and power level of the signal generator to be set. Follow the command . Press and the window will close. Read the SNR result from the window SNR Measurement.
RM-94 Nokia Customer Care Select 6(b) - RF Troubleshooting Scan Product Ctrl-R Wait until the phone information is shown in the lower right corner of the screen. Set to . Select Testing T RF Controls Select F Band GSM 900 or GSM1800 or GSM1900 Active unit RX Operation mode Continuous RX/TX Channel 37 or 700 or 661 Please refer to the fault finding chart and Appendix for proper levels at different test points.
RM-94 6(b) - RF Troubleshooting Nokia Customer Care Signal amplitude 1.40Vpp DC offset ª 1.28V as the offset is floating, switch to the operating mode in Phoenix and read the DC offset Frequency 67kHz ■ Fault finding chart of the receiver During fault finding, the calibration procedure is used to find out, whether all bands are affected (error in common part of the Rx chain) or only one band (error in a Rx part of the failed band).
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting RSSIreading [dBm] = 20log(UBB/ULSB) - AGCcalibrated In order to check the levels and frequencies of RF signals, the following probe can be used (note that only the core lead contacts the test point, the shielding of the coaxial cable does not contact GND during the measurement): Connect this probe via a coaxial cable and a DC block to a spectrum analyzer.
RM-94 6(b) - RF Troubleshooting Make sure that Synthesizer is working Nokia Customer Care see Synthesizer Fault Finding Tree No Yes Receiver Fault Finding Tree part 1 = To be done in all three bands. All 3 bands Phoenix: Phone: local mode Open RF Controls: Active Unit: Op. Mode: Rx/Tx channel: Rx Burst default (mid) Signal Generator: Level: Frequency: –80dBm calculated from Phoenix + 67.71kHz Phoenix: Open RSSI reading Check RSSI Level = -80dBm Yes Selected band is working and calibrated.
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting Oscilloscope: Check reference voltages of RF part: VrefRF01 = 1.35V ? (TP: VrefRF01*) No Check supply filter components (R7511, C7524) and UEM No Check supply filter components (R2900, R2901, C2900, C2901) and UEM Receiver Fault Finding Tree part 4 Yes Oscilloscope: Check reference voltages of RF part: VrefRF02 = 1.
RM-94 6(b) - RF Troubleshooting Nokia Customer Care Single band fault finding Select faulty band in Phoenix and continue measurements on dedicated Rx part. Receiver Fault Finding Tree part 7 Phoenix: open SNR Measurement Meas. Mode: Fast SNR Press Measure. Signal Generator: Level: Frequency: –92dBm calculated from Phoenix Phoenix: SNR measurement ok? (SNR > 18.37dB)? Front end is ok. Yes Phoenix: Phone: local mode RF Controls: No Active Unit: Op.
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting No If selected band = GSM1900 Receiver Fault Finding Tree part 9 Yes Yes Spectrum Analyzer: Check SAW filter Z7801: 1) No Change Z7801 TP: OUT-Z7801 Output signal > Pref - 3.5dB No Yes Spectrum Analyzer: Check external LNA V7800: 1) TP: OUT-V7800 Output signal > Pref +14dB No Oscilloscope: Check voltages for V7800: Voltage at C7802 = 2.
RM-94 6(b) - RF Troubleshooting Nokia Customer Care Channel select filter fault finding Continue measurement only when channel select filter calibration failed Receiver Fault Finding Tree part 10 Make sure that Synthesizer is working and supply voltages of RF ASIC are ok Phoenix: Phone: local mode RF Controls: Active Unit: Op. Mode: Rx/Tx channel: AGC: Rx Burst default (mid) 14 Signal Generator: Level: Frequency: –60dBm 942.4MHz Offset: 67.
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting Transmitter ■ General instructions for TX troubleshooting Connect the phone to a PC, which has Phoenix Service Software and a dongle installed, using either • repair jig and DAU-9S (RS232) cable or • repair jig and XCS-4 cable via FPS-8 Flash Box or • DAU-9T cable (RS232) Connect the phone to a power supply (DC voltage of 3.6V) and switch the phone on. The value of the DC voltage of 3.6V at the phone battery connector is crucial.
RM-94 6(b) - RF Troubleshooting Nokia Customer Care Operation mode Burst RX/TX Channel 37 TX Power Level 10 TX Data Type Random Edge Off The setup should now look like this: Now the measurement equipment should detect the following output signal of the phone: Pout = +23dBm @ 897.4 MHz If this is not the case, go to the GMSK fault finding chart for the GSM900 transmitter. EDGE Set operating mode to local mode. Select Testing RF Controls Wait until the RF Controls window pops up.
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting RX/TX Channel 37 TX Power Level 10 TX Data Type All1 Edge On The setup should now look like this: Now the measurement equipment should detect the following output signal of the phone: Pout = +24.5 dBm @ 897.4 MHz If this is not the case, go to the EDGE fault finding chart for GSM900 transmitter. Fault finding chart for GSM900 transmitter In the following, it is assumed that the TXP signal is used as trigger signal.
RM-94 6(b) - RF Troubleshooting Nokia Customer Care GMSK Use Phoenix to select TX_Data Type: Random TX Power Level: 10 Ch37 Ensure Vbatt=3.6 V Yes Oscilloscope C7711 R7511 C7512 TXP testpoint C7517 R7516 Yes Oscilloscope C7529 TXIOUTP C7529 TXIOUTN C7530 TXQOUTP C7530 TXQOUTN Mode VREF01 VR2 TXP VR5 VR3 Yes Oscilloscope C7701 VC1 VC2 VC3 R7713 VTXB_900 CONT1 CONT2 CONT3 VPCTRL_90 0 Yes Spectrum analyzer Z7700 out, R7704 in RFin_850/ 900 V = 0 Volt Vdc = 1.35 Volt Vdc = 2.78 Volt V = 1.
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting EDGE Ensure that GMSK is ok. Use Phoenix to select TX_Data Type: All 1 EDGE: On TX Power Level: 10 Ch37 Ensure Vbatt=3.6 V Yes Oscilloscope C7702 IREF01 V ~ 1.77 Volt C7711 VPCTRL_900 Mode R7713 V = 1.8 Volt V= 2.7 V Check No Baseband Yes Spectrum analyzer RF@Test-Jig Pout = +24.5 dBm, 897.
RM-94 6(b) - RF Troubleshooting Nokia Customer Care The setup should now look like this: Now the measurement equipment should detect the following output signal of the phone: Pout = +23dBm @ 1747.8 MHz If this is not the case, then go to the GMSK fault finding chart for GSM1800 transmitter. EDGE Set operating mode to local mode. Select Testing RF Controls Wait until the RF controls window pops up.
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting The setup should now look like this: Now the measurement equipment should detect the following output signal of the phone: Pout = +21.5 dBm @ 1747.8 MHz If this is not the case, then go to the EDGE fault finding chart for GSM1800 transmitter. Fault finding chart for GSM1800 transmitter In the following, it is assumed that the TXP signal is used as trigger signal. For that, a TXP test point is provided. 24 COMPANY CONFIDENTIAL Copyright © 2005 Nokia.
RM-94 6(b) - RF Troubleshooting Nokia Customer Care GMSK TX_Data Type: Random TX Power Level: 5 Ch700 Ensure Vbatt=3.6 V Yes Oscilloscope C7711 R7511 C7512 TXP testpoint C7517 R7516 Yes Oscilloscope C7529 TXIOUTP C7529 TXIOUTN C7530 TXQOUTP C7530 TXQOUTN Mode VREF01 VR2 TXP VR5 VR3 Yes Oscilloscope C7709 VTXB_1800 _1900 CONT1 CONT2 VC1 VC2 VC3 R7715 CONT3 VPCTRL_18 00_1900 Yes Spectrum analyzer T7700 out, R7709 in V = 0 Volt Vdc = 1.35 Volt Vdc = 2.78 Volt V = 1.8 Volt Vdc = 2.
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting EDGE Ensure that GMSK is ok. Use Phoenix to select TX_Data Type: All 1 EDGE: On TX Power Level: 5 Ch700 Ensure Vbatt=3.6 V Yes Oscilloscope C7702 IREF_900 V = 1.83 Volt C7711 VPCTRL_900 Mode R7715 V = 1.8 Volt Vdc= 2.7 V Yes Spectrum analyzer RF@Test-Jig Pout = +21.5 dBm, 1747.
RM-94 6(b) - RF Troubleshooting Nokia Customer Care The setup should now look like this: Now the measurement equipment should detect the following output signal of the phone: Pout = +23dBm @ 1880 MHz If this is not the case, then go to the GMSK fault finding chart for GSM1900 transmitter. EDGE Set operating mode to local mode. Select Testing RF Controls Wait until the RF Controls window pops up.
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting The setup should now look like this: Now the measurement equipment should detect the following output signal of the phone: Pout = +21.5 dBm @ 1880 MHz If this is not the case, then go to the EDGE fault finding chart for GSM1900 transmitter. Fault finding chart for GSM1900 transmitter In the following, it is assumed that the TXP signal is used as trigger signal. For that, a TXP test point is provided. 28 COMPANY CONFIDENTIAL Copyright © 2005 Nokia.
RM-94 6(b) - RF Troubleshooting Nokia Customer Care GMSK Use Phoenix to select TX_Data Type: Random TX Power Level: 5 Ch661 Ensure Vbatt=3.6 V Yes Oscilloscope C7711 R7511 C7512 TXP testpoint C7517 R7516 Yes Oscilloscope C7529 TXIOUTP C7529 TXIOUTN C7530 TXQOUTP C7530 TXQOUTN Yes Oscilloscope C7709 VC1 VC2 VC3 R7715 Yes Spectrum analyzer T7700 out, R7709 in Mode VREF01 VR2 TXP VR5 VR3 VTXB_1800 _1900 CONT1 CONT2 CONT3 VPCTRL_18 00_1900 Vdc = 0 Volt Vdc = 1.35 Volt Vdc = 2.78 Volt V = 1.
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting EDGE Ensure that GMSK is ok. Use Phoenix to select TX_Data Type: All 1 EDGE: On TX Power Level: 5 Ch661 Ensure Vbatt=3.6 V Yes Oscilloscope C7702 IREF_900 V = 1.83 Volt C7711 VPCTRL_1800 1900 Mode R7715 V = 2.78 Volt V= 2.7 V Yes Spectrum analyzer RF@Test-Jig Pout = +21.5 dBm, 1880 MHz Yes GSM 1900 TX OK 30 No Check No Baseband Check PA N7700 Check Power Loop (TXC, RFin 1800 1900, DET) COMPANY CONFIDENTIAL Copyright © 2005 Nokia.
RM-94 6(b) - RF Troubleshooting Nokia Customer Care Synthesizer ■ General instructions for synthesizer troubleshooting Connect the phone to a PC, which has Phoenix Service Software and a dongle installed, using either • repair jig and DAU-9S (RS232) cable or • repair jig and XCS-4 cable via FPS-8 Flash Box or • DAU-9T cable (RS232). Connect the phone to a power supply (DC voltage of 3.6V) and switch the phone on. Follow the instructions in the chapters below.
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting The VCO chamber has a fixed shielding lid, which can only be opened by destroying it. To enable measurements with a closed lid, holes are located at positions where the supply voltage VR7, the tuning voltage Vc and the output frequency fVCO can be measured. Figure 1:Test holes in the VCO chamber The VCO frequency has to be measured with a special probe, which fits into the holes of the shielding lid.
RM-94 6(b) - RF Troubleshooting Nokia Customer Care Figure 3:Typical frequency tuning curve for the FDK VCO Temperature: +25°C Frequency [MHz] 4500 4000 3500 3000 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 VCTRL [V] 2.55V @ 24.4 .. 25.4°C 2.7V @ 24.4 .. 25.4°C High limit Low limit 2.85V @ 24.4 .. 25.4°C Even if the PLL is not working properly (Vc outside the valid range), a frequency at the output of the VCO can be detected between 3GHz and 4.
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting ■ Fault finding chart for PLL synthesizer Figure 4:PLL Fault Finding Tree Synthesizer Fault Finding Tree part 1 Phoenix: Phone is responding to Phoenix commands. For example, Ctrl-R reads the right phone information. No Yes Baseband part is not working, possible reason: 26MHz missing. Oscilloscope VCTCXO output at G7501 26MHz,app.0.8Vpp Yes No Oscilloscope REFCLK output of N7500: Signal VCTCXO=RFCLK_I at C2902, R2902. 26MHz,app.0.
RM-94 6(b) - RF Troubleshooting Nokia Customer Care Synthesizer Fault Finding Tree part 2 Setup with Phoenix: Band: GSM 1800 Mode: RX Continuous Channel: 700 Spectrum analyzer VCO out (G7500) fVCO = 3685.6 MHz Vc of VCO = 2.1..2.6V PLL Block is functional Yes No Spectrum analyzer VCO out (G7500) Some signal 3 - 4.4 GHz No Yes Oscilloscope VCO supply Yes Check R7503 and T7500. Change VCO G7500 No Check supply filter components: C2203, R7500, C7500, C7501 Check UEM.
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting ■ Frequency tables GSM900 (including EGSM900) CH TX RX VCO TX VCO RX 975 880.2 925.2 3520.8 3700.8 976 880.4 925.4 3521.6 3701.6 977 880.6 925.6 3522.4 3702.4 978 880.8 925.8 3523.2 3703.2 979 881.0 926.0 3524.0 3704.0 980 881.2 926.2 3524.8 3704.8 981 881.4 926.4 3525.6 3705.6 982 881.6 926.6 3526.4 3706.4 983 881.8 926.8 3527.2 3707.2 984 882.0 927.0 3528.0 3708.0 985 882.2 927.2 3528.8 3708.8 986 882.4 927.4 3529.6 3709.6 987 882.6 927.6 3530.4 3710.
RM-94 6(b) - RF Troubleshooting Nokia Customer Care GSM1800 Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting GSM1900 38 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
RM-94 6(b) - RF Troubleshooting Nokia Customer Care DC Supply Voltage Check For a quick check of DC power supplies, refer to the diagram below. The RF power supplies are generated in the UEM and can be measured either in the Small Signal Chamber or in the Base Band Chamber. The UEM output voltages can be measured at the respective resistors' / capacitors' pads marked below in brackets, e.g. < C1234 >. UEM 4.75 V [ 4.6V ... 4.9V ] < C7516 > VR1 < C7510 > VR2 charge pump (VCP) 2.78 V [ 2.70V ... 2.
RM-94 Nokia Customer Care 6(b) - RF Troubleshooting This page has been intentionally left blank. 40 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
Nokia Customer Care Appendix 6A: Test Points Issue 1 04/2005 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
ty p . 6 3 d B m 3 7 1 4 6 0 d B m 9 4 2 .4 6 7 7 1 M H z P re f (d B m ) ty p . 6 3 d B m R X /T X C h a n n e l A G C In p u t P o w e r In p u t F re q u e n c y P ro b e d P o w e r L e v e l COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved. V A N T _ 1 (V C 3 ) 0 V [0 V ] D C L e v e l T e s tp o in ts V A N T _ 1 (V C 3 ) 0 V [0 V ] 6 6 V A N T (V C 1 0 V [2 .
Issue 1 04/2005 A p p ro x . 1 .7 5 V p p S ig n a l A m p litu d e G ra p h ( ty p ic a l fo r b o th T P s a n d a ll b a n d s ) G ra p h ( ty p ic a l fo r b o th T P s a n d a ll b a n d s ) S ig n a l A m p litu d e A p p ro x . 2 V p p In p u t F re q u e n c y 9 4 2 .4 6 7 7 1 , 1 8 4 2 .8 6 7 7 1 o r 1 9 6 0 .0 6 7 7 1 M H z In p u t P o w e r In p u t F re q u e n c y 1 4 6 0 d B m A G C 9 4 2 .4 6 7 7 1 , 1 8 4 2 .8 6 7 7 1 o r 1 9 6 0 .
[Volt] 0 0 2.6 2.6 2.6 [Volt] 0 0 0 0 2.6 0 0 2.6 0 0 [Volt] VC3 37 Typ. 3.6V Operation Mode RX/TX Channel DC Level COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved. ANT RFout_1800_1900 VrefRF01* TXIP RFout_900 VR3 DC Level X GSM 1800 /1900 Tx 2.8V 37 Burst TX Iref_1800_1900 MODE Iref_900 520mVpp 1.2Vdc Signal Amplitude DC Offset RFin_900 VPCTRL_900 RFin_1800_1900 (typical for all TPs and bands) Layout: 1cna_41 (Build 4.
) Issue 1 04/2005 T e s t-J ig COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved. P o w e r @ T y p .
) 46 T e s t-J ig T x D a ta T y p e P o w e r @ A ll 1 T y p . + 2 4 .5 d B m T x D a ta T y p e P o w e r @ G S M T X B u rs t A ll 1 1 .9 6 V (B u rs t) R F @ 1 0 R X /T X C h a n n e l T x P o w e r L e v e l T x D a ta T y p e V o lta g e T e s tp o in t B a n d A c tiv e U n it COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved. O p e r a tio n M o d e T x D a ta T y p e L o s s e s o f jig c o m p e n s a te d + 2 1 .
Issue 1 04/2005 c o u p le d ) COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved. V re fR F 0 1 V R 7 (C 7 5 0 0 ) A F C (G 7 5 0 1 ) V c o f V C T C X O V C T C X O o u t 2 6 M H z L a y o u t: 1 c n a _ 4 1 (B u ild 4 .
RM-94 Nokia Customer Care Appendix 6A: Test Points This page has been intentionally left blank. 48 COMPANY CONFIDENTIAL Copyright © 2005 Nokia. All Rights Reserved.
