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6(b) - RF Troubleshooting

Instructions

6(b) RF Troubleshooting

and Manual Tuning

Summary of content (44 pages)

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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care Table of Contents Page No Introduction ......................................................................................................... 5 Notes on reference measurements.................................................................... 5 Helgo / Synthesizer Troubleshooting................................................................ 6 N500 Helgo troubleshooting ....................................................................
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning EGSM900 band with EDGE Off ..................................................................... 40 EGSM900 band with EDGE On ..................................................................... 42 EGSM1800 band with EDGE Off ................................................................... 42 GSM1800 band with EDGE On ..................................................................... 42 GSM1900 band with EDGE Off .......................
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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.
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning Helgo / Synthesizer Troubleshooting Figure 1:Helgo/Synthesizer Figure 2:PA/TX 6 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care ■ N500 Helgo troubleshooting N500 HELGO troubleshooting Set Phoenix to RF local burst RX mode Measure N500 Helgo supply voltages: - VR1 C551 - 4,75V? -VR1 at at C516 - 4,75V? - VR2 C520 - 2,8V? -VR2 at at C510 - 2,8V? - VR3 C503 - 2,8V? -VR3 at at C522 - 2,8V? VR4 at C554 - 2,8V? -VR4 at C520 -2,8V? VR5 at C553 - 2,8V? -VR5 at C518 -2,8V VR6 at C555 - 2,8V? -VR6 at C521 -2,8V? VR7 at C297 2,8V? (located at BB bottom grid S3) -VR7 at C500 -2,
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning ■ Synthesizer troubleshooting Synthesizer Troubleshooting Phoenix: RF local mode Rx continuous Frequency = 3770.4 MHz @ ch. 38 Measure G501 VCTCXO output voltage at G501 pin 3 26 MHz 900 mVpp. OK ? Measure N500 26 MHz reference output voltage at R420 L515 800 mVpp. OK? Measure G501 VCTCXO AFC voltage at C540. C527 Measure RF frequency and level at T500.
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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care Tx Troubleshooting Figure 3:Helgo/Synthesizer Figure 4:PA/TX ISSUE 1 11/04 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning ■ Tx 900 GMSK troubleshooting Figure 5:TX 900 GMSK troubleshooting TX850/900 GMSK troubleshooting TX 900 GMSK troubleshooting Apply a 50 ohm load at the antenna connector of the jig. GSM900/ cha. 37 = 897.4 MHz, burst mode power level 10 Spectrum analyzer: RBW = 500 Khz and VBW = 500 kHz, center = 500 kHz and span = 20 MHz Measure voltage of a) TXI at C529 and TXQ at C530, Txi and TXQ = 500 mVpp min. and 1.
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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care ■ Tx 1800/1900 GMSK troubleshooting Figure 6:TX 1800/1900 GMSK troubleshooting TX1800/1900 GMSK troubleshooting Apply a 50 ohm load at the antenna connector of the jig. GSM1800 ch. 700 = 1747,8 MHz, burst mode power level 5 GSM1900 ch. 661 = 1880,0 MHz, burst mode power level 5 Spectrum analyzer RBW = 500 kHz and VBW = 500 kHz and span = 20 MHz Measure voltage of a) TXI at C529 and TXQ at C530, Txi and TXQ = 500 mVpp min. and 1.
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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care ■ Rx 900 troubleshooting Figure 9:RX 900 troubleshooting RX 900 Troubleshooting GSM900 ch. 37. Continuous Rx. Use AGC “gain step” 14 Apply a signal of 942.46771 MHz (+67.71 kHz offset) 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.
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning ■ Rx 1800 troubleshooting Figure 10:RX 1800 troubleshooting RX 1800 Troubleshooting GSM1800 ch. 700. Continuous Rx. Use AGC “gain step” 14 Apply a signal of 1842,86771 MHz (+67.71 kHz offset) at -90 dBm to 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). RXI and RXQ = 500 mVpp and 1.35 VDC. Note: DC level drops after a while.
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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care ■ Rx 1900 troubleshooting Figure 11:RX 1900 troubleshooting RX 1900 Troubleshooting GSM1900 ch. 661. Continuous Rx. Use AGC “gain step” 12. Apply a signal of 1960,06771 MHz (+67.71 kHz offset) at -90 dBm to the antenna pad J124. Spectrum analyzer: RBW = 500 kHz, VBW = 500 kHz, 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.
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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care ■ Bluetooth troubleshooting Figure 13:Bluetooth troubleshooting Bluetooth troubleshooting Phoenix normal mode: Tx data 1 ch. 39 (2441 MHz approx. 1 MHz BW). BC02 Bluetooth control. Options: Internal gain = 52 Spectrum analyzer: RBW = 500 kHz, VBW = 500 kHz, center = 942 Mhz and span = 20 Mhz. OK Measure N130 BT supply voltage = 2.8V (C6036). NOK Replace N6031 OK Measure N6030 VDD-ANA voltage regulator output = 1.
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning ■ FM radio troubleshooting Figure 14:FM radio troubleshooting FM Radio Troubleshooting Phoenix: Testing -> FM radio -> Power on. FM signal: Frequency = 100 MHz, frequency deviation = 67.5 kHz, modulation frequency = 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.
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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care Service Tool Concept for RF Tunings All RF tunings for RM-14 phones must be carried out in MJ-34 Module Jig. Power to MJ-34 should be supplied from an external DC power supply, not FPS-8 prommer. MJ-34 input voltages: • Maximum + 16 VDC • Nominal input for RF tunings is +12 V DC Remember cable attenuation when setting required RF levels.
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning ■ Service concept for RM-14 RF tunings Table 1: Item 20 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 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care Receiver Tunings ■ RX channel select filter calibration Extra equipment / external RF signal is not needed. Must be done before other RX calibrations. This function is used to calibrate 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.
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning ■ RX calibration RF generator is needed. This tuning performs RX 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.
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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care Set RF generator to required EGSM900 frequency => OK Tuning values and ADC readings will 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
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning Tuning will automatically move to the next band (GSM1800) when you press “Save & Continue”. GSM1800 band When asked, set the RF generator to required GSM1800 frequency => OK Tuning values and ADC readings will be shown.
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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care Tuning will automatically move to the next band (GSM1900) when you press “Save & Continue” GSM1900 band Set RF generator 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
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning Tuning will be completed when you press “Save & Continue”. Close the “RX – Calibration” dialog to end tuning. ■ RX band filter response compensation RF generator needed. Must be performed separately on all bands! Start the RX calibration at EGSM (GSM900), then continue to the GSM1800 band and finally to the GSM1900 band.
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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 ISSUE 1 11/04 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning Set 4th required frequency and level => OK Set 5th required frequency and level => OK Set 6th required frequency and level => OK 28 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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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. ISSUE 1 11/04 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning Typical values and limits in Rx Band Filter Response Compensation EGSM900: Table 5: Channel Input frequency [MHz] 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.
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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care Table 6: 870 1876.8677 1 +-1 -5 5 885 1879.8677 1 +-1 -5 5 908 1884.4677 1 +-3 -10 5 Tuning will automatically move to the next band (GSM1900) when you press “Save & Continue”. GSM1900 band Repeat the same steps as for the EGSM900 and GSM1800 bands above.
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning Tuning will be completed when you press “Save & Continue”. Close the “RX Band Filter Response Compensation” dialog to end tuning. 32 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.
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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care Transmitter Tunings ■ TX power level tuning Power Meter (or Spectrum analyzer) is needed. With Tx power level tuning, the coefficients are adjusted 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.
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning EGSM900 PA High Mode with EDGE off Select “Start”, the tuning begins 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.
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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care Tune base level and power levels 19,15 and 5 to target level. When tuning values are correct, choose “Save & Continue”. If all coefficients are within specified limits, tuning will continue on the EGSM900 PA Low Mode with EDGE off. Typical values: Table 8: Power level GSM900 EDGE off 5 0.650 … 0.850 15 0.140 … 0.200 19 0.120 … 0.170 Base 0.090 … 0.
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning 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 … 0.290 19 0.180 … 0.280 Base 0.100 … 0.180 GSM1800 PA high mode with EDGE off Set Power Meter (or Spectrum analyzer) as required. Repeat the same steps as for EGSM high and low mode above.
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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care GSM1800 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 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.
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning GSM1900 PA high mode with EDGE off Set Power Meter (or Spectrum analyzer) 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 38 GSM1900 EDGE off 0 0.
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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care GSM1900 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 15 to 2 to target level. When tuning values are correct, choose “Save & Continue”. Typical values: Table 13: Power level GSM1900 EDGE on 2 0.550 … 0.700 3 0.470 … 0.620 4 0.400 … 0.
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning ■ TX I/Q tuning Spectrum analyzer is needed. Tx IQ tuning allows changing the Tx I DC Offset, Tx Q DC Offset, Amplitude difference and Phase difference.
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RM-14 RF Troubleshooting and Manual Tuning Nokia Customer Care The order of tuning should be the same as the order of the sliders 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).
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RM-14 Nokia Customer Care RF Troubleshooting and Manual Tuning Tx IQ Tuning limits are the same for all bands (GSM900, GSM1800 and GSM1900): Table 15: Tuning Limits EDGE off EDGE on TX I DC Offset -4 … +4 -6 … +6 TX Q DC Offset -4 … +4 -6 … +6 Amplitude Difference -1.2 … +1.2 -1 … +1 Phase Difference 80 … 100 80 … 100 Tuning will automatically move to the next step, EGSM900 with EDGE on when you press “Save & Continue”. EGSM900 band with EDGE On Choose “Start” to begin tuning.
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RM-14 RF Troubleshooting and Manual 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. ISSUE 1 11/04 COMPANY CONFIDENTIAL Copyright © 2004 Nokia. All Rights Reserved.