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ISSUE 1 11/04

COMPANY CONFIDENTIAL

5

Copyright © 2004 Nokia. All Rights Reserved.

RM-14

RF Troubleshooting and Manual Tuning

Nokia Customer Care

Introduction

This document is the troubleshooting guide for RM-14. On the following pages you will find a
step-by-step fault finding procedure and reference measurements at the relevant signal points.

Note! Most test points are not accessible unless shielding cans are cut open.
This must ONLY be done by the Return Analysis technicians and for analysis
only!

■

Notes on reference measurements

•

LF & DC signals are measured with Textronix 100 MHz Scope (TDS3014) and

P3010 13pF probe.

•

RF signals are measured with R&S FSIQ 7GHz Spectrum Analyzer and Agilent

resistive divider probe (10dB, 500ohm).

•

Please be aware that the RF connector on service adaptor is leaking power (into

air) and acts as noise source when probing on RX chain. In 1800 band the problem
is most severe while there is no external LNA to amplify the signal above the noise
level like in the 1900 band. In 900 band the leakage is not as high due to lower fre-
quency.

•

GSM SA settings: RBW=500kHz, VBW=500kHz.

•

Bluetooth SA settings: RBW=2MHz, VBW=2MHz.

•

All reference measurements were made on a RM-14 phone (GSM900).

•

RF loss Module Repair Jig: 900: 0.6 dB, 1800: 1.1dB and 1900: 1.2dB. Bluetooth

is 1.8dB.

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Содержание RM-14

Страница 1: ...Nokia Customer Care ISSUE 1 11 04 Copyright 2004 Nokia All Rights Reserved 6 b RF Troubleshooting Instructions 6 b RF Troubleshooting and Manual Tuning ...

Страница 2: ...RM 14 Nokia Customer Care RF Troubleshooting and Manual Tuning 2 COMPANY CONFIDENTIAL ISSUE 1 11 04 Copyright 2004 Nokia All Rights Reserved This page left intentionally blank ...

Страница 3: ...eshooting 15 Bluetooth FM Radio Troubleshooting 16 Bluetooth troubleshooting 17 FM radio troubleshooting 18 Service Tool Concept for RF Tunings 19 Service concept for RM 14 RF tunings 20 Receiver Tunings 21 RX channel select filter calibration 21 RX calibration 22 EGSM900 band 22 GSM1800 band 24 GSM1900 band 25 RX band filter response compensation 26 EGSM900 band 27 GSM1800 band 30 GSM1900 band 31...

Страница 4: ...band with EDGE Off 42 GSM1900 band with EDGE On 43 List of Figures Page No Fig 1 Helgo Synthesizer 6 Fig 2 PA TX 6 Fig 3 Helgo Synthesizer 9 Fig 4 PA TX 9 Fig 5 TX 900 GMSK troubleshooting 10 Fig 6 TX 1800 1900 GMSK troubleshooting 11 Fig 7 Helgo Synthesizer 12 Fig 8 PA TX 12 Fig 9 RX 900 troubleshooting 13 Fig 10 RX 1800 troubleshooting 14 Fig 11 RX 1900 troubleshooting 15 Fig 12 Bluetooth FM 16 ...

Страница 5: ...nals are measured with Textronix 100 MHz Scope TDS3014 and P3010 13pF probe RF signals are measured with R S FSIQ 7GHz Spectrum Analyzer and Agilent resistive divider probe 10dB 500ohm Please be aware that the RF connector on service adaptor is leaking power into air and acts as noise source when probing on RX chain In 1800 band the problem is most severe while there is no external LNA to amplify ...

Страница 6: ...okia Customer Care RF Troubleshooting and Manual Tuning 6 COMPANY CONFIDENTIAL ISSUE 1 11 04 Copyright 2004 Nokia All Rights Reserved Helgo Synthesizer Troubleshooting Figure 1 Helgo Synthesizer Figure 2 PA TX ...

Страница 7: ...9 Measure N500 Helgo supply voltages VR1 at C551 4 75V VR2 at C520 2 8V VR3 at C503 2 8V VR4 at C554 2 8V VR5 at C553 2 8V VR6 at C555 2 8V VR7 at C297 2 8V located at BB bottom grid S3 Measure N500 serial bus signals RfBusClk at J501 RfBusEna1 at J502 Reset at J503 RfBusData at J509 All measured in Burst Mode Logic high level 1 8V NOK Check baseband VR1 at C516 4 75V VR2 at C510 2 8V VR3 at C522 ...

Страница 8: ...output voltage at Measure G501 VCTCXO AFC voltage at C540 Measure RF frequency and level at T500 Place the probe through the hole in the shield Correct frequency found YES NO No frequency or wrong frequency Synthesizer is ok No frequency found within the 3 4 GHz span Wrong frequencies found Measure VCO supply voltage at C560 2 8 V OK Replace VCO YES Measure VCO control voltage at C505 YES YES VCO ...

Страница 9: ...ISSUE 1 11 04 COMPANY CONFIDENTIAL 9 Copyright 2004 Nokia All Rights Reserved RM 14 RF Troubleshooting and Manual Tuning Nokia Customer Care Tx Troubleshooting Figure 3 Helgo Synthesizer Figure 4 PA TX ...

Страница 10: ...Note VPCTRL_G voltage is a function of power level b VTXB_G 2 7V C701 R713 and N700 PA bias voltage Measure N700 PA control voltage a VPCTRL_G 1 2 V during burst at Note DET voltage is a function of power level Measure N700 PA power detector DET 850 mV during burst at R701 NOK Z800 pin1 Measure RF level 10 dBm at N700 PA output TX_OUT_EGSM OK Measure RF level 13 dBm at N700 PA input R704 pin1 Meas...

Страница 11: ...oltage b VTXB_1800 1900 2 7 V C709 Note VPCTRL_1800 1900 voltage is a function of power level Measure RF level 2 dBm at antenna pad J124 Measure N700 PA supply voltage VBAT at C705 Note DET voltage is a function of power level Measure N700 PA power detector DET 810 mV during burst at R701 NOK Measure RF level 3 dBm at N700 PA output TX_OUT_DCS Z800 OK Measure RF level 10 dBm at N700 PA input R707 ...

Страница 12: ...RM 14 Nokia Customer Care RF Troubleshooting and Manual Tuning 12 COMPANY CONFIDENTIAL ISSUE 1 11 04 Copyright 2004 Nokia All Rights Reserved Rx Troubleshooting Figure 7 Helgo Synthesizer Figure 8 PA TX ...

Страница 13: ... at 90 dBm to the antenna pad J124 Spectrum analyzer RBW 500 kHz VBW 500 kHz center 942 MHz and span 20 MHz Measure voltage of a RXI J512 b RXQ J513 RXI and RXQ 800 mVpp and 1 35 VDC Note DC level drops after a while Change the signal level to 30 dBm Measure RF level 55 dBm at Z803 SAW filter input Measure Z800 antenna switch control signal voltages a VANT_1 0V C811 b VANT_2 0V C809 c VANT_3 0V C8...

Страница 14: ...the antenna pad J124 Spectrum analyzer RBW 500 kHz VBW 500 kHz center 1840 MHz and span 20 MHz Measure voltage of a RXI J512 b RXQ J513 Note DC level drops after a while Change the signal level to 30 dBm Measure RF level 30 dBm at Z802 SAW filter input Measure Z809 antenna switch control signal voltages a VANT_1 0V C811 b VANT_2 0V C809 c VANT_3 0V C810 Measure RF level at Helgo input C807 not ass...

Страница 15: ...z f 1960 MHz and span 20 MHz Measure voltage of a RXI J512 b RXQ J513 RXI and RXQ 700 mVpp and 1 35 VDC Change the signal level to 50 dBm and set gain step 6 Measure RF level at Z801 SAW filter input Measure antenna switch control signal voltages a VANT_1 0V C811 b VANT_2 2 7V C809 c VANT_3 2 7V C810 Measure RF level at V800 LNA input C801 Z800 antenna switch pin1 OK NOK Measure RF level at V800 L...

Страница 16: ...RM 14 Nokia Customer Care RF Troubleshooting and Manual Tuning 16 COMPANY CONFIDENTIAL ISSUE 1 11 04 Copyright 2004 Nokia All Rights Reserved Bluetooth FM Radio Troubleshooting Figure 12 Bluetooth FM ...

Страница 17: ... L130 NOK Measure SYSCLK voltage 800 mVpp 26 MHz 1 8 VDC C6038 Check C6038 and go to Synthesizer troubleshooting Measure N6030 XTAL_IN voltage 0 6Vpp square wave R6042 Measure D6030 supply voltage 2 8V at C6040 Check L6031 L6032 If passive components OK replace D6030 Measure RF level 15 dBm at a TX_A and TX_B C6046 at both terminals Replace Z6030 Check L6031 L6032 If passive componen OK replace N6...

Страница 18: ...ulation fre quency 1 kHz R L pilot tone on and RF level 67 dBm Signal is injected at X102 bottom connector pin 11 12 13 or 14 Alternative Use FM signal received by headset Measure audio voltage a VAFL 200 mVpp 1 kHz 850 mVDC C6180 both sides b VAFR 200mVpp 1 kHz 850 mVDC C6182 both sides FM Radio OK NOK OK Measure CPOUT voltage 0 9 V 100 MHz C6162 Check 6158 R6159 R6160 C6162 and C6157 Visual insp...

Страница 19: ...minal input for RF tunings is 12 V DC Remember cable attenuation when setting required RF levels RF tunings should be made in the same order as shown in this document the order of the cor responding menu items in the Phoenix Service SW may be different If baseband tunings are needed they should be made before the RF tunings Avoid unnecessary tuning factory tuning values are always the most accurat...

Страница 20: ...Y CONFIDENTIAL ISSUE 1 11 04 Copyright 2004 Nokia All Rights Reserved Service concept for RM 14 RF tunings Table 1 Item Type Description Product code 1 MJ 34 Module jig 0780346 2 PCS 1 DC power cable 0730012 3 XRF 1 Modular cable 0730085 4 DAU 9S Service MBUS cable 0730108 ...

Страница 21: ...RX channel select filter in GSM Phones Rx Channel select filter is tuned only in one lowest band Single calibration for all bands Select Tuning Rx Channel select filter calibration Press Tune to start the tuning Values will be saved to the phone when the Save to Phone tick box is checked If the Save to Phone tick box is not checked the values are not saved to the phone when you stop the tuning or ...

Страница 22: ...Calibration Must be done separately on all bands Calibration is automatically performed at EGSM GSM900 then at GSM1800 and finally at the GSM1900 band If the tuning is successful it continues in the next band AFC tuning is carried out while EGSM GSM900 band RX Calibration is performed Remember to take jig and cable attenuations into account Select Tuning Rx calibration EGSM900 band Press Start to ...

Страница 23: ...ill be shown Typical values and limits in GSM900 RX Calibration Table 2 GSM900 Typical value Low limit High limit AFC value 0 350 350 AFC slope 150 50 350 RSSI 0 68 58 78 RSSI 1 74 64 84 RSSI 2 80 70 90 RSSI 3 86 76 96 RSSI 4 92 82 102 RSSI 5 97 87 107 RSSI 6 103 93 113 RSSI 7 109 99 119 RSSI 8 115 105 125 RSSI 9 121 111 131 RSSI 10 127 117 137 RSSI 11 133 123 143 RSSI 12 139 129 149 RSSI 13 145 1...

Страница 24: ...F generator to required GSM1800 frequency OK Tuning values and ADC readings will be shown Typical values and limits in GSM1800 RX Calibration Table 3 GSM1800 Typical value Low limit High limit RSSI 0 65 55 75 RSSI 1 71 61 81 RSSI 2 77 67 87 RSSI 3 83 73 93 RSSI 4 89 79 99 RSSI 5 94 84 104 RSSI 6 100 90 110 RSSI 7 106 96 116 RSSI 8 112 102 122 RSSI 9 118 108 128 RSSI 10 124 114 134 RSSI 11 130 120 ...

Страница 25: ...or to required GSM1900 frequency OK Tuning values and ADC readings will be shown Typical values and limits in GSM1900 RX Calibration Table 4 GSM1900 Typical value Low limit High limit RSSI 0 67 57 77 RSSI 1 73 63 83 RSSI 2 79 69 89 RSSI 3 85 75 95 RSSI 4 91 81 101 RSSI 5 98 88 108 RSSI 6 104 94 114 RSSI 7 110 100 120 RSSI 8 116 106 126 RSSI 9 122 112 132 RSSI 10 128 118 138 RSSI 11 134 124 144 RSS...

Страница 26: ...on all bands Start the RX calibration at EGSM GSM900 then continue to the GSM1800 band and finally to the GSM1900 band Remember to carry out the RX calibration before carrying out Rx band filter response compen sation Remember to take jig and cable attenuations into account Select Tuning Rx Band Filter Response Compensation Select Manual tuning and Start You will be asked to supply 9 different RF ...

Страница 27: ... Copyright 2004 Nokia All Rights Reserved RM 14 RF Troubleshooting and Manual Tuning Nokia Customer Care EGSM900 band Set first required frequency and level OK Set 2nd required frequency and level OK Set 3rd required frequency and level OK ...

Страница 28: ...roubleshooting and Manual Tuning 28 COMPANY CONFIDENTIAL ISSUE 1 11 04 Copyright 2004 Nokia All Rights Reserved Set 4th required frequency and level OK Set 5th required frequency and level OK Set 6th required frequency and level OK ...

Страница 29: ... Nokia All Rights Reserved RM 14 RF Troubleshooting and Manual Tuning Nokia Customer Care Set 7th required frequency and level OK Set 8th required frequency and level OK Set 9th required frequency and level OK Tuning values and ADC readings will be shown ...

Страница 30: ...band above Typical values and limits in Rx Band Filter Response Compensation GSM1800 Table 5 Channel Input frequency MHz Typical value dB Low limit dB High limit dB 965 923 26771 3 10 5 975 925 26771 1 5 5 987 927 66771 1 5 5 1009 932 06771 1 5 5 37 942 46771 1 5 5 90 953 06771 1 5 5 114 957 86771 1 5 5 124 959 86771 1 5 5 136 962 26771 3 10 5 Table 6 Channel Input frequency MHz Typical value dB L...

Страница 31: ...for the EGSM900 and GSM1800 bands above Typical values and limits in Rx Band Filter Response Compensation GSM1900 870 1876 8677 1 1 5 5 885 1879 8677 1 1 5 5 908 1884 4677 1 3 10 5 Table 7 Channel Input frequency MHz Typical value dB Low limit dB High limit dB 496 1927 0677 1 3 10 5 512 1930 2677 1 1 5 5 537 1935 2677 1 1 5 5 586 1945 0677 1 1 5 5 661 1960 0677 1 1 5 5 736 1975 0677 1 1 5 5 794 19...

Страница 32: ...oubleshooting and Manual Tuning 32 COMPANY CONFIDENTIAL ISSUE 1 11 04 Copyright 2004 Nokia All Rights Reserved Tuning will be completed when you press Save Continue Close the RX Band Filter Response Compensation dialog to end tuning ...

Страница 33: ...d for each power level Tuning must be performed separately on all band and all modes When EDGE is on the tuning must be carried out for all power levels Tx power level tuning steps are EGSM900 PA High Mode with EDGE off EGSM900 PA High Mode with EDGE on GSM1800 PA High Mode with EDGE off GSM1800 PA High Mode with EDGE on GSM1900 PA High Mode with EDGE off GSM1900 PA High Mode with EDGE on Select T...

Страница 34: ...ins automatically from the EGSM900 band Set Power Meter or Spectrum analyzer as required Note that TX PA mode is High at this point The coefficient table lists the power level coefficient target dBm and DAC value for each power level The tuned power level can be chosen by using up and down arrows or mouse The current power level is shown with inverse colors The tuning value can be adjusted with an...

Страница 35: ...ith EDGE off Typical values EGSM900 PA high mode with EDGE on Set Power Meter or Spectrum analyzer as required Repeat the same steps as for EGSM high and low mode above When EDGE is on the tuning must be made for all power levels Tune base level and all power levels from 19 to 8 to target level When tuning values are correct choose Save Continue If all coefficients are within specified limits tuni...

Страница 36: ...15 11 and 0 to target level When tuning values are correct choose Save Continue If all coefficients are within specified limits tuning will continue on the GSM1800 PA high mode with EDGE on Typical values Table 9 Power level GSM900 EDGE on 8 0 500 0 650 9 0 400 0 550 10 0 350 0 500 11 0 320 0 470 12 0 300 0 440 13 0 280 0 400 14 0 250 0 350 15 0 230 0 330 16 0 210 0 310 17 0 200 0 300 18 0 190 0 2...

Страница 37: ...e for all power levels Tune base level and all power levels from 15 to 2 to target level When tuning values are correct choose Save Continue If all coefficients are within specified limits tuning will continue on the GSM1900 PA high mode with EDGE off Typical values Table 11 Power level GSM1800 EDGE on 2 0 550 0 700 3 0 470 0 620 4 0 400 0 550 5 0 350 0 500 6 0 320 0 470 7 0 290 0 430 8 0 260 0 36...

Страница 38: ...yzer as required Repeat the same steps as for EGSM high and low mode above Tune base level and power levels 15 11 and 0 to target level When tuning values are correct choose Save Continue If all coefficients are within specified limits tuning will continue on the GSM1900 PA high mode with EDGE on Typical values Table 12 Power level GSM1900 EDGE off 0 0 600 0 750 11 0 130 0 190 15 0 110 0 150 Base ...

Страница 39: ... levels Tune base level and all power levels from 15 to 2 to target level When tuning values are correct choose Save Continue Typical values If values shown are within limits select Save Continue values are saved to phone memory Close the TX Power Level Tuning dialog to end tuning Table 13 Power level GSM1900 EDGE on 2 0 550 0 700 3 0 470 0 620 4 0 400 0 550 5 0 350 0 500 6 0 320 0 470 7 0 290 0 4...

Страница 40: ...y on all bands TX I Q tuning steps are EGSM GSM900 with EDGE off EGSM with EDGE on GSM1800 with EDGE off GSM1800 with EDGE on GSM1900 with EDGE off GSM1900 with EDGE on Remember to take jig and cable attenuations into account Select Tuning TX IQ Tuning EGSM900 band with EDGE Off Select Start to begin tuning at EGSM900 band with EDGE off Set spectrum analyzer to required settings OK The tuning is c...

Страница 41: ...ers e g the Tx I DC Offset is tuned first and Phase difference is tuned last Use PgUp or PgDn keys The tuning is performed by setting each of the sliders to desired value Tune LO leak to minimum with TXI TXQ DC offset control f0 on spectrum analyzer screen Tune the wrong sideband to minimum using Amplitude Phase difference controls f0 68kHz on spectrum analyzer screen Table 14 Before tuning After ...

Страница 42: ...tings settings for GSM1800 band OK Repeat the same tuning steps as for the EGSM900 band above Tuning will automatically move to the next step EGSM1800 with EDGE on when you press Save Continue GSM1800 band with EDGE On Choose Start to begin tuning Set the spectrum analyzer to required settings for GSM1800 band OK Repeat the same tuning steps as for the EGSM900 band above Tuning will automatically ...

Страница 43: ...anual Tuning Nokia Customer Care GSM1900 band with EDGE On Choose Start to begin tuning Set the spectrum analyzer to required settings for GSM1900 band OK Repeat the same tuning steps as for the EGSM900 band above Tuning will be completed when you press Save Continue Choose OK to close the TX I Q Tuning dialog ...

Страница 44: ...RM 14 Nokia Customer Care RF Troubleshooting and Manual Tuning 44 COMPANY CONFIDENTIAL ISSUE 1 11 04 Copyright 2004 Nokia All Rights Reserved This page left intentionally blank ...

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