User Guide

ManualsBrandsNokia ManualsCell Phone6630

7 — RF Troubleshooting and

Manual Tuning Guide

Nokia Customer Care

Issue 1 Company Confidential Page 7–1

Summary of content (168 pages)

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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Table of Contents Introduction to RF troubleshooting.........................................................................................................................................7–5 RM-1 RF key component placement.........................................................................................................................................7–5 RM-1 fault finding test point locations......................................
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Nokia Customer Care RM-1 RF Troubleshooting and Manual Tuning Guide Figure 72 Main antenna, GSM and WCDMA...........................................................................................................................7–16 Figure 73 Feed and GND spots of the main antenna.........................................................................................................7–16 Figure 74 RF channel filter calibration typical values.................................................................
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Introduction to RF troubleshooting All measurements should be done using: • spectrum analyser with a high-frequency high-impedance passive probe (LO-/reference frequencies and RF power levels) • oscilloscope with a 10:1 probe (DC-voltages and low frequency signals) Caution: A mobile phone WCDMA transmitter should never be tested with full Tx power, if there is no possibility to perform the measurements in a good performance RF-shielded ro
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care RM-1 fault finding test point locations Test points for spectrum analyzer Figure 64 Test point locations for spectrum analyzer Issue 1 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Test points for oscilloscope Figure 65 Test points for oscilloscope - bottom Page 7–8 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Figure 66 Test points for oscilloscope - top Receiver troubleshooting Introduction to Rx troubleshooting Rx can be tested by making a phone call or in the local mode. For the local mode testing, use Phoenix service software. Issue 1 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.
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Nokia Customer Care RM-1 RF Troubleshooting and Manual Tuning Guide The main Rx troubleshooting measurement is RSSI measurement. This test measures the signal strength of the received signal. I and Q branches can be measured separately. For GSM RSSI measurement, see GSM Rx chain activation for manual measurements / GSM RSSI measurement (Page 7–10), and for the same measurement in WCDMA, see WCDMA RSSI measurement (Page 7–12).
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care WCDMA Rx chain activation for manual measurement Steps 1. Start Phoenix service software. 2. From the Testing menu, choose WCDMA and Rx Control. Figure 68 Activating Rx Control window in Phoenix 3. In the Rx Control window: Figure 69 Rx Control window • From the AGC Mode pane, select Algorithm. • Set AFC Algorithm to OFF (Default = OFF). • Set Channel to 10700. Next action When settings are ready, click Update to activate them.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care WCDMA RSSI measurement Before you begin WCDMA Rx must be activated before RSSI can be measured. See WCDMA Rx chain activation for manual measurement (Page 7–11). Steps 1. From the Testing menu in Phoenix, choose WCDMA -> Rx Power Measurement. 2. In the Rx Power Measurement window, choose the following settings: • Mode: RSSI • Continuous Mode 3. To perform the measurement, click Start.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Make sure that you have a PKD-1 dongle connected to the computer's parallel port. 2. Connect a DC power supply to a module jig (MJ-26). Note: When repairing or tuning a transmitter, use an external DC supply with at least 3 A current capability. Set the DC supply voltage to 3.9 V and set the jumper connector on the test jig's reg.pass switch to “ON” position. 3.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care • Set Edge to “Off” (Default). • Set Tx PA mode to “Free” (Default). • Set power level to 5 (Default = 19) on GSM900 or to 0 (Default = 15) on GSM1800 or GSM1900. Figure 70 RF Controls window • WCDMA troubleshooting i ii From the toolbar, set system to "WCDMA". From the Testing menu, activate the Tx Control window: Maintenance -> Testing -> WCDMA -> Tx Control.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care • Set Channel to 9750. Figure 71 Tx Control window Next action When settings are done, click “Send” to enable them. If you change the settings (e.g. give a new channel number), you need to click “Stop” and “Send” again. Checking antennae functionality The main antenna has two separate antenna elements: GSM and WCDMA. In the GSM antenna, there is one Feed and two GND contacts. In the WCDMA antenna, there is one Feed and one GND contact.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care The contacts of the GSM antenna are separated in the (RDC = 0 ohm) short-circuit. The contacts of the WCDMA antenna are in the (RDC = 0 ohm) short-circuit. Figure 73 Feed and GND spots of the main antenna Figure 72 Main antenna, GSM and WCDMA The antenna is functioning normally when the contacts function (RDC = 0 ohm) and the antenna is visually intact. BT antenna BT antenna has one Feed and two GND contacts.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care RF manual tuning guide Introduction to RF tunings Phone RF is tuned in production. There is no reason to do the re-calibration unless: • One or more of the RF components is changed • FLASH Memory chip (D3000) is changed or otherwise corrupted. RF calibration is always performed with the help of module jig MJ-26. Whenever possible, automatic tuning system should be used. If manual tuning is used, only relevant tunings should be performed.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care RF autotuning with CMU200 Before you begin Recommended test set-up: • Windows 2000 PC • CMU200 communication tester • USB to GPIB converter from National Instruments. Order information: 778416-01 GPIB-USB-B, NI-488.2 for Windows 2000/XP/Me/98. Before you can use the auto-tune feature, the GPIB driver from the GPIB card vendor must be installed and running. Then the auto tune .
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 4. To specify the cable loss from module jig to CMU200, choose Set Loss from the Tuning menu.. 5. In the Set Loss window, click the Jig tab and select the right jig for the phone. Issue 1 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 6. Click the Cable tab and add the extra cable attenuation. Page 7–20 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 7. To start autotuning, choose Auto-Tune from the Tuning menu. 8. 9. In the Auto-Tune window, click Options. In the Auto-Tune options window, see that the "Enable showing of messages" check box is checked. Then click OK. Issue 1 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.
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Nokia Customer Care RM-1 RF Troubleshooting and Manual Tuning Guide 10. Connect the phone's WCDMA RF port to CMU200 and click Tune. Page 7–22 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 11. Change the phone's RF adapter from WCDMA port to GSM port. To complete the RF autotuning, click OK. Issue 1 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Results "Autotuning completed successfully" message appears. Page 7–24 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care System mode independent manual tunings RF channel filter calibration Context Rx channel filter calibration tunes Rx and Tx ASICs' internal low pass filters that limit the bandwidth of BB IQ signals. One common calibration is made for GSM and WCDMA. Table 4 RF channel filter calibration tuning limits Min Typ Max TX filter 0 10 31 RX filter 0 16 31 Unit Steps 1. 2. 3. 4.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Results Figure 74 RF channel filter calibration typical values PA detection Context PA detection procedure asks DSP to detect which PA manufacturer is used for GSM and WCDMA PAs. If PA is changed or if PMM data is corrupted, PA detection has to be performed before Tx tunings. Steps 1. 2. 3. 4. 5. From the dropdown menus, set "System mode" to Local and "Operating mode" to WCDMA, GSM or Dual. From the Tuning menu, choose PA Detection.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 3. Click Tune. Table 5 Temperature sensor calibration tuning limits Min Typ Max Unit -20 -4 20 0C A popup window appears asking: “Save Values to PM”. Click “Yes” 4. To finish the calibration, click Close. GSM receiver tunings Rx calibration (GSM) Context Rx Calibration is used to find out the real gain values of the GSM Rx AGC system and tuning response of the AFC system (AFC D/A init value and AFC slope) Steps 1. 2. 3.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 6. Click Start (if it not active already). 7. Click Calibrate. 8. Connect signal generator to the phone and set frequency and amplitude as instructed in the "Rx Calibration with band EGSM900" popup window. The calibration uses a non-modulated CW signal. Increase the signal generator level by cable attenuation and module jig probe attenuation! Page 7–28 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 9. To perform tuning, click OK. 10. Check that the tuning values are within the limits specified in this table: Table 6 RF tuning limits in Rx calibration GSM900 Min Typ Max AFC Value -200 -105 62 200 AFC slope 0 122 200 106 107 110 114 dB 104 104 109 114 dB 104 104 109 114 dB RSSI0 Unit GSM1800 RSSI0 GSM1900 RSSI0 Issue 1 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 11. To save values to the phone, check the "Save to Phone" check box and click Stop. Next action Repeat steps 3 to 8 for GSM1800 and GSM1900 Rx band filter response compensation (GSM) Before you begin Rx calibration must be done before the Rx Band Filter Response Compensation Context In each GSM Rx band, there’s a band rejecting filter in front of HINKU front end.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 3. From the Tuning menu, choose GSM -> Rx Band Filter Response Compensation. 4. 5. Check “Manual” and “Load from Phone” check boxes. Clear “Save to Phone” check box Click Start. 6. Click Tune. Issue 1 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 7. Connect signal generator to the phone and set frequency and amplitude as instructed in the "Rx Band Filter Response Compensation for EGSM900" popup window. 8. To perform tuning, click OK. 9. Go through all 9 frequencies. 10. Check that the tuning values are within the limits specified in this table: Min Typ Max Unit Ch. 965 / 923.26771 MHz -10 -1 5 dB Ch. 975 / 925.26771 MHz -3 0 5 dB Ch. 987 / 927.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Min Typ Max Unit Ch. 124 / 959.86771 MHz -3 0 5 dB Ch. 136 / 962.26771 MHz -10 -1 5 dB Ch. 497 / 1802.26771 MHz -10 -1 5 dB Ch. 512 / 1805.26771 MHz -3 0 5 dB Ch. 535 / 1809.86771 MHz -3 0 5 dB Ch. 606 / 1824.06771 MHz -3 0 5 dB Ch. 700 / 1842.86771 MHz -3 0 5 dB Ch. 791 / 1861.06771 MHz -3 0 5 dB Ch. 870 / 1876.86771 MHz -3 0 5 dB Ch. 885 / 1879.86771 MHz -3 0 5 dB Ch. 908 / 1884.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Ch. 835 / 1994.86771 MHz Min Typ Max Unit -10 -1 5 dB 11. Check the "Save to Phone" check box and click Stop if the values are within the limits. Next action Repeat the steps 4 to 10 for GSM1800 and GSM1900. Rx AM suppression (GSM) Context Rx AM suppression is used to tune the AM suppression capabilities of the GSM receiver.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Power level -25 dBm / -26 dBm / -29 dBm (increase by cable and jig attenuations) Modulation AM AM modulation depth 90% Modulation signal 50 kHz sinewave (or 15 kHz if 50 kHz is not available) 6. Click Start. 7. Click Tune. 8. Check that RSSI level value is between the limits presented in this table. If not, try clicking the Tune button again.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 2. From the Tuning menu, choose GSM -> Tx IQ Tuning. 3. Set Mode to Automatic and Edge to Off. 4. Click Start. Wait until automatic tuning has finished and moved the sliders. Values are written to the phone memory automatically. 5. When the values have been written to the phone memory, click the Finish button to end the tuning. 6. Change band to GSM1800 and repeat steps 4 to 5. Page 7–36 Company Confidential Copyright © 2004 Nokia.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 7. Change band to GSM1900 and repeat steps 4 to 5. 8. To close the tuning window, click Close. Next action Tuning sliders should be close to the center of the scale after the tuning and within the limits specified in the table below. If they are not within the limits, check Tx IQ quality manually.
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Nokia Customer Care 6. RM-1 RF Troubleshooting and Manual Tuning Guide Trigger Video triggering (-10dBm) Resolution BW 3MHz Video BW 3MHz Reference level offset sum cable attenuation with module jig attenuation Reference level 33dBm A power meter with a peak power detector can be also used. Remember to take the attenuations in the account! Click Start. Page 7–38 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 7. Adjust power levels 5, 15 and 19 to correspond the "Target dBm" column by pressing + or – keys. 8. Click Calculate Coefficients. 9. Check that the coeffiecient values are within the limits specified in the table below. Min Typ Max 0.45 0.626 0.73 Unit GSM900 EDGE off PL5 coefficient PL15 coefficient Issue 1 0.234 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care PL19 coefficient Min Typ Max 0.12 0.195 0.3 0.35 0.419 0.6 Unit GSM900 EDGE on PL8 coefficient PL15 coefficient PL19 coefficient 0.247 0.12 0.204 0.3 0.45 0.51 0.7 GSM1800 EDGE off PL0 coefficient PL11 coefficient PL15 coefficient 0.219 0.12 0.185 0.3 0.35 0.394 0.6 GSM1800 EDGE on PL2 coefficient PL11 coefficient PL15 coefficient 0.23 0.12 0.194 0.3 0.45 0.482 0.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 10. Set Edge mode on and start tuning again. Change video averaging to 50. 11. Tune EDGE power levels to the corresponding target power levels. Only power levels 8, 15 and 19 are tuned in GSM900 and 2, 10 and 15 in GSM1800/1900. The rest are calculated by clicking the Calculate Coefficients button. Check the coefficients against the RF tuning limits table presented in Step 9. 12. When the tuning is completed, click Stop.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Steps 1. From the dropdown menus, set "Operating mode" to Local and "System mode" to WCDMA. 2. From the Tuning menu, choose WCDMA -> Rx AGC Alignment. 3. Click Start and Tune. 4.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 5. Check that the “Rx Chain” value in “Tuning Results” is within the limits presented in the table below. Min Typ Max Unit RX chain -6 1.5 3.5 6 dB Low freq -5 -0.7 4.0 5 High freq -5 -0.7 4.0 5 i If the Rx gain is acceptable, click Yes to save the results to the phone. 6. To close the tuning window, click Close.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 3. Click Start and Tune. 4. Setup the signal generator to correspond the values in the pop-up window: Frequency: 2113.4MHz Level: –51 dBm + cable and adapter attenuations Modulation: FM Deviation: 500 kHz Modulation frequency: 50 kHz 5. Click OK. 6. Change frequency to 2166.6 MHz and click OK. 7.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care i If the values are OK, click Yes to save the values. 8. Close the tuning window. Alternative steps • • • • From the dropdown menus, set "Operating mode" to Local and "System mode" to WCDMA. From the Tuning menu, choose WCDMA -> Rx AGC Alignment. Click Start. Check the “Tune Rx Band Response” check box and click Tune. • Setup the signal generator according to the values in the pop-up window: Frequency list: 2113.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Min Typ Max Unit Rx chain -6 1.5 3.5 6 dB Low freq -5 -0.7 4.0 5 High freq -5 -0.7 4.0 5 • If the Rx gain is acceptable, click Yes to save the results to the phone. • To close the window, click Close.
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RM-1 RF Troubleshooting and Manual Tuning Guide 6. 7. Nokia Customer Care Average: No Trigger: Video Trigger level: 0 dBm Marker: 250 us Marker step: 500 us After setting the spectrum analyzer, click OK. Measure the power levels with a marker. Take the first measurement from 250 us after the trigger, the second from 750 us, the third on 1225 us and so on in every 500 us until the table is filled. Note: It must be possible to measure power levels down to –68 dBm.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 8. Fill in the power level values (in dBm) to the Wide Range table. 9. In the Wide Range pane, click Calculate. 10. In the High Burst pane, click Tune. 11.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 12. Measure the power levels with a marker. Take the first measurement from 250 us after the trigger, the second from 750 us, third on 1225 us and so on in every 500 us until the table is filled. Figure 75 High burst measurement 13. In the High Burst pane, click Calculate. 14. Check that the calculated values are within the limits specified in the table below: Min Typ Max C0-high -0.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 18. Select the Algorithm mode tab. 19. Write the target power level 25 dBm to the "Start level" line and check the "Max power limit" check box (detector calibration check). 20. Setup the spectrum analyzer with the following settings: Center frequency: 1947.
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RM-1 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Remember to stop the RF before sending new data. Alternative steps • • • • • Measure the wide range levels normally and write down the levels that are possible to measure. Click Finish. Click Options. Change the first wide range DAC value to 573 and change the number of tuning steps to 21. Change the spectrum analyzer reference level to –20 dBm and adjust the input attenuator to the lowest value possible.
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Nokia Customer Care RM-1 RF Troubleshooting and Manual Tuning Guide Tx LO leakage (WCDMA) Context The purpose of Tx LO leakage tuning is to minimize the carrier leakage of the IQ-modulator which is caused by the DC offset voltages in the Tx IQ-signal lines and in the actual IQ-modulator. The tuning improves WCDMA Tx AGC dynamics at low power levels. A self-calibration routine selects the best combination for internal control words in order to produce minimum LO leakage. Steps 1. 2. 3. 4.
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RM-1 RF Troubleshooting Nokia Customer Care Table of Contents 1. 2. Using these instructions .................................................................................................................. 5 RF Self tests ..................................................................................................................................... 6 2.1 RX PLL phase lock self test (ST_CDSP_RX_PLL_PHASE_LOCK_TEST)................................................... 7 2.
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RM-1 RF Troubleshooting Nokia Customer Care Does the phone register to the network and make a call (WCDMA)?................................................ 68 4.1 WCDMA TX power and transmit frequency ok? ......................................................................... 68 4.1.1 Does the WCDMA TX transmit RF-power at all? .................................................................. 68 4.1.2 Does WCDMA TX transmit enough RF-power and power levels otherwise ok?.................... 80 4.1.
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RM-1 RF Troubleshooting Nokia Customer Care 6.5.8 6.5.9 TX Modulation spectrum (GSM)....................................................................................... 113 RFBUS ............................................................................................................................ 114 Issue 1 7A - 4 Company Confidential Copyright © 2004 Nokia.
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RM-1 RF Troubleshooting Nokia Customer Care 1. USING THESE INSTRUCTIONS The following sections include lots of headings and subheadings that are asking simple positive style questions. For example heading 4.2 asks if the phone does measure RSSI-values correctly in GSM-bands. If the answer is “Yes” then user should go to the next heading on the same level (heading number that has as many decimal numbers as the heading 4.2) In our example case moving to the chapter 4.3.
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RM-1 RF Troubleshooting Nokia Customer Care 2. RF SELF TESTS The RF part of Nokia 6630 is equipped with self test functionality which tests most of RF-BB interface signals and some parts of RF circuitry. Self-tests are designed to detect faults on some critical parts, but they cannot prove that everything is OK even if all the self-tests are passed. Self-tests can be run with Phoenix service software. Tests can return pass/fail result and detailed measurement data and error codes in fail case.
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RM-1 RF Troubleshooting Nokia Customer Care If one or more self tests show fail results (for example: “minor” or “fatal”) more detailed error codes can be read from the phone with “Details” button. Error codes are shown in hexadecimal format, but notice that all returned hexadecimal values are not necessarily useful in RF troubleshooting because some of the self-tests return also different kind of measurement information together with “real” error codes.
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RM-1 RF Troubleshooting Nokia Customer Care 3.2.2.7 “Is there RF power in the RX VCO output at all?” and section 3.2.2.8 “Is RX VCO RF-signal coming to the Hinku at all?” See section 3.2.2.9 “Is RX VCO frequency as expected?” Faulty Hinku (N7500) or RAP3G (D2800)? Please, refer to chapter 2.11 “Error Code Interpretation Examples”, if more information about error code interpretation is needed. 2.
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RM-1 RF Troubleshooting Nokia Customer Care 0x0004 -------------1-- Register write-read cycle failed. Faulty Hinku (N7500) or RAP3G (D2800)? See section 3.1.1.1.1 “RF operating voltage VBAT_ASIC?” Check RXRESETX signal. See section 3.1.1.1.2 “RFBUS signals ok?” 0x0008 ------------1--- Incorrect version number read from the TX IC. Faulty Hinku (N7500) or RAP3G (D2800)? See section 3.1.1.1.1 “RF operating voltage VBAT_ASIC?” Check RFBUS signal levels, see section 3.1.1.1.
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RM-1 RF Troubleshooting Nokia Customer Care 2.3 RX IQ loop back self test (ST_CDSP_RX_IQ_LOOP_BACK_TEST) This test verifies if the RX-IQ signal path from Hinku (N7500) to the baseband circuitry is operational.
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RM-1 RF Troubleshooting Nokia Customer Care Please, refer to chapter 2.11 “Error Code Interpretation Examples”, if more information about error code interpretation is needed. 2.4 TX IQ self test (ST_CDSP_TX_IQ_TEST) This test verifies if TX-IQ lines from RAP3G (D2800) to Vinku (N7501). Test returns pass of fail result and measured test voltages from each of four lines. The voltage should be equal on each line and more than 1.2V.
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RM-1 RF Troubleshooting Nokia Customer Care ,where 0xyy, 0xzz part is the total error code: 0xyyzz Error code Bit mask Reason Actions 0x0001 ---------------1 Communication with Vinku failed. 3.1.1.1.1 “RF operating voltage VBAT_ASIC?” 0x0002 --------------1- 3.1.1.1.3 “Vinku (N7501) regulator voltages VREG1, VREG2 ok?” Is RF-BB interface self-test result also fail? 3.1.1.1.2 “RFBUS signals ok?” Faulty Vinku (N7501) or RAP3G (D2800)? 0x0004 -------------1-- Vinku PLL is not locked. 3.1.1.1.
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RM-1 RF Troubleshooting Nokia Customer Care ,where 0xyy, 0xzz part is the main part of the error code: 0xyyzz Error code Bit mask Reason Actions 0x0001 ---------------1 Test cannot be executed. Internal SW error. Should not happen. 0x0002 --------------1- 0x0008 ------------1--- 0x0010 -----------1---- 0x0004 -------------1-- Does RF-BB interface self test also fail? 3.1.1.1.2 “RFBUS signals ok?” Power detector reading is outside limits. 3.1.1.1.1.
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RM-1 RF Troubleshooting Nokia Customer Care • WTXDET should be about 325 mV with power level +10 dBm, about 1.03 V with power level +21 dBm and about 150 mV when power levels below 0 dBm are used. • NOTICE: Perform WCDMA transmitter tests with > 0 dBm power only in RF shielded environment. • If WTXDET –signal is not as expected follow the same troubleshooting instructions as in: 4.1.2.3.2.4 “Does SMPS get correct control voltage from the WCDMA power detector (signal Vcontrol)?” 2.
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RM-1 RF Troubleshooting Nokia Customer Care 2.8 GSM transmitter self test (ST_CDSP_GSM_TX_POWER_TEST) This test verifies if GSM transmitter can transmit power. Test covers: RFIC Vinku (N7501), modulator, IC gain control stages, filter/balun solder joints, GSM PA (N7502), PA bias lines & DACs, RFBUS, TX power detector functionality, VBAT_ASIC, VBAT_PA.
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RM-1 RF Troubleshooting Nokia Customer Care NOTICE: There are two error code tables for this self-test, one for Vinku and one for Hinku supply voltage troubleshooting. Error code table for Vinku supply voltage errors (0xyyyy): Error code Bit mask Reason Actions 0x0001 ---------------1 3.1.1.1.3.
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RM-1 RF Troubleshooting Nokia Customer Care 0x0100 0x0200 0x0800 -------1-------- ------1--------- ----1----------- VPRE pin of TX ASIC RB_EXT pin of TX ASIC or Vinku internal bias block Temperature sensor 3.1.1.1.1 “RF operating voltage VBAT_ASIC?” 3.1.1.1.3 “Vinku (N7501) regulator voltages VREG1, VREG2 ok?” Poor soldering in Vinku ASIC (N7501)? 3.1.1.1.1 “RF operating voltage VBAT_ASIC?” 3.1.1.1.3.1 “Vinku (N7501) RB_EXT voltage ok?” Poor soldering in Vinku ASIC (N7501)? 3.1.1.1.
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RM-1 RF Troubleshooting Nokia Customer Care 0x0008 ------------1--- VMIX pin of Hinku RX ASIC 0x0010 -----------1---- VDDLNA1 & VDDLNA2 pin of Hinku RX ASIC 0x0020 ----------1----- VDDLNA2 pin of Hinku RX ASIC 0x0040 ---------1------ VLO pin of Hinku RX ASIC 0x0080 --------1------- VPRE pin of Hinku RX ASIC 0x0100 0x0200 -------1-------- ------1--------- RB_EXT pin of Hinku RX ASIC or Hinku internal bias block Temperature sensor soldering in Hinku RX ASIC (N7500) or faulty Hinku ASIC:
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RM-1 RF Troubleshooting Nokia Customer Care NOTE! ST_CDSP_RF_SUPPLY_TEST error code: 0x00, 0x00, 0x03, 0xBF, … means typically that there is no VBAT_ASIC voltage coming to the Hinku RX ASIC at all or the ASIC is poorly soldered to the PWB (All voltages that are somehow related to VBAT_ASIC are causing errors). Please, refer to chapter 2.11 “Error Code Interpretation Examples”, if more information about error code interpretation is needed. 2.
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RM-1 RF Troubleshooting Nokia Customer Care There is also another way to do the error code interpretation in this case: 0x004 hexadecimal value is “100” in binary format. If we look the error code table (bit mask column) again it can be seen that the results is the same “Hinku PLL is not locked”. 2.11.2 Example 2 Some of the self-tests can return multiple errors at the same time.
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RM-1 RF Troubleshooting Nokia Customer Care Bit mask ----------1-----: “ST_TX_VVGA” Bit mask --------1-------: “ST_TX_VLO” Bit mask -------1--------: “ST_TX_VPRE” Bit mask ------1---------: “ST_TX_RBEXT_OR_BIAS” Bit mask ----1-----------: “ST_TX_TEMP_SENSOR” But there are no errors with: Bit mask ---------------1: “ST_VBEXT_OR_TXMUXOUT” Bit mask --------------1-: “ST_VXO_SUPPLY” Bit mask ---------1------: “ST_TX_VVCO” Bit mask -----1----------: “No error defined for this bit mask” Typically this kind of e
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RM-1 RF Troubleshooting Nokia Customer Care 3. DOES THE PHONE REGISTER TO THE NETWORK AND MAKE A CALL (GSM)? • Test against a GSM communication tester or real GSM network with a proper SIM. 3.1 GSM transmitter power levels and transmit frequency ok? • Attach the phone to the product specific test jig (AD-23) and a spectrum analyser to the RF-coupler. Remember that there are two antenna connectors in the coupler, one for GSM and one for WCDMA.
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RM-1 RF Troubleshooting Nokia Customer Care • If TX signal is not found at all use wider span setting and check if the transmitter is transmitting on wrong frequency. If the signal is found to be on wrong frequency or frequency is not stabile, see section 3.1.3. "GSM transmitter frequency correct". 3.1.1 Does GSM TX transmit RF-power at all? • If TX signal is not found at all use wider span setting and check if the transmitter is transmitting on wrong frequency.
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RM-1 RF Troubleshooting Nokia Customer Care 3.1.1.1.1 RF operating voltage VBAT_ASIC? • Measurement can be done with an oscilloscope and a probe. • Connect the probe to C7503 (or C7501, C7541) • VBAT_ASIC voltage level should be 3.05 – 5.4 V. Typical value is 4.0 V. 3.1.1.1.1.1 Ferrite inductor L7503 ok? • Check that component is in place and solder joints are ok • Measure voltage from the both ends of L7503.
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RM-1 RF Troubleshooting Nokia Customer Care 3.1.1.1.3 Vinku (N7501) regulator voltages VREG1, VREG2 ok? • GSM transmitter has to be active before VREG1 and VREG2 voltages can be measured. Procedure is explained in chapter “General instructions for TX troubleshooting.” • Measurements can be done with an oscilloscope and a probe. • VREG1: Connect the probe to C7543 • VREG2: Connect the probe to C7548 (or C7547) • VREG1 and VREG2 voltage levels should be 2.65 – 2.86 V. Typical value is 2.7 V. 3.1.1.
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RM-1 RF Troubleshooting Nokia Customer Care 3.1.1.1.3.1.3.1 Is R7503 in place and working correctly? • Check that the component is in place and solder joints are ok • Disconnect the power supply from the phone and check R7503 resistance value with an ohmmeter 3.1.1.1.3.1.3.
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RM-1 RF Troubleshooting Nokia Customer Care • VCP2 voltage should be about 4.75 V. 3.1.1.1.5.1 C7550 and C2221 working correctly? • Check that components are in place and solder joints are ok • Disconnect the power supply from the phone and use an ohmmeter to find out if the VCP2line is short-circuited to the ground. If short-circuit is found replace C7550 and C2221. If this does not help go to the next steps. 3.1.1.1.5.2 Retu ok? 3.1.1.1.5.3 Vinku (N7501) ok? 3.1.1.1.
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RM-1 RF Troubleshooting Nokia Customer Care • VREG1 and VREG2 voltage levels should be 2.65 – 2.86 V. Typical value is 2.7 V. 3.1.1.1.6.2 Replace TX VCO (G7502) 3.1.1.1.7 Is TX VCO RF-signal coming to the Vinku at all? • GSM transmitter has to be active before TX VCO’s output level can be measured. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Measurements can be done with a spectrum analyser and an RF probe.
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RM-1 RF Troubleshooting Nokia Customer Care • Typical TX control voltage TXC levels should be now about: - EGSM900: 1.0 V while TX burst and 0 V otherwise. - DCS1800/PCS1900: 0.7 V while TX burst and 0 V otherwise. 3.1.1.1.9.1 R7514 in place? • Check that the component is in place and solder joints are ok • Disconnect the power supply from the phone and check R7514 resistance value with an ohmmeter 3.1.1.1.9.
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RM-1 RF Troubleshooting Nokia Customer Care 3.1.1.1.10.3 Replace VCTCXO G7501 3.1.1.1.11 Replace Vinku (N7501) 3.1.1.2 Is there RF-power in the GSM PA (N7502) input at all? • GSM transmitter has to be active before measurements. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Set TX power level to the maximum (“5” in EGSM900 and “0” in DCS1800/PCS1900) • Measurements can be done with a spectrum analyser and an RF probe.
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RM-1 RF Troubleshooting Nokia Customer Care 3.1.1.2.2.1 Matching components ok? DCS1800/PCS1900: C7575 and C7577 • Check that components are in place and solder joints are ok • DCS1800 and PCS1900: Disconnect the power supply from the phone and use an ohmmeter to check that capacitors C7575 and C7577 are not short-circuited. If short-circuit is found replace the faulty capacitor. 3.1.1.2.
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RM-1 RF Troubleshooting Nokia Customer Care • EGSM900: Connect the probe to J7520 (test point). The RF level should be about -16…-17 dBm. • DCS1800 or PCS1900: Connect the probe to J7519 (test point). The RF level should be roughly -29…-30 dBm in both bands. 3.1.1.3.1 GSM PA (N7502) operating voltage ok? • Measurement can be done with an oscilloscope and a probe. • Connect the probe to C7593 • Voltage level should be 3.05 – 5.4 V. Typical value is 4.0 V 3.1.1.3.1.
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RM-1 RF Troubleshooting Nokia Customer Care • Measurements can be done with an oscilloscope and a VOLTAGE probe. • EGSM900: - Connect the probe to C7545 or C7544. Notice: C7544 is a non-assembled component so the probe should be connected to the pad that can be still found from the PWB. - Typical full TX power bias currents (Icont_21 and Icont_22) should look somehow similar to figure 6.5.4 when measured with an oscilloscope and a probe. Check both currents.
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RM-1 RF Troubleshooting Nokia Customer Care troubleshooting”. GSM RX activation is described in chapter “GSM RX chain activation for manual measurements”. • Use an oscilloscope and probe to find out if antenna switch control lines are working according to table shown below. “Hi” means that there is 2.4 – 2.8 V control voltage level in the corresponding control line. “Lo” means levels 0 – 0.2 V.
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RM-1 RF Troubleshooting Nokia Customer Care • DCS1800/PCS1900: - Connect the RF probe to C7577 or C7575. The level should be about the same on both capacitors. Check output level with at least the maximum (0) and the minimum (15) power levels. - Maximum power level – Output level should be about -25…-35 dBm - Minimum power level – Output level should be about -55…-65 dBm • Check if output levels of Vinku are as expected.
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RM-1 RF Troubleshooting Nokia Customer Care 3.1.2.1.4 Is the TXC-signal coming to Vinku ASIC (N7501) OK? Is signal level correct? • GSM transmitter has to be active before TX control voltage TXC can be measured. Procedure is explained in section “General instructions for TX troubleshooting”. • Set TX power level first to the maximum (“5” in EGSM900 and “0” in DCS1800/PCS1900) • Measurement can be done with an oscilloscope and a probe.
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RM-1 RF Troubleshooting Nokia Customer Care • Connect the probe to C7595 pad. Notice: C7595 is a non-assembled component so the probe should be connected to the pad that can be still found from the PWB. • DET_SW_G voltage should be about 2.8 V while TX burst and 0 V otherwise. 3.1.2.1.5.1 C7595 working correctly? • Check that the component is in place and solder joints are ok • Disconnect the power supply from the phone and check with an ohmmeter that C7595 is not short-circuited. 3.1.2.1.5.
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RM-1 RF Troubleshooting Nokia Customer Care • Spectrum analyser RBW and VBW = 1 MHz, Span = 0, sweep time 1 ms. Notice that GSM transmission has pulsed nature and VCO output power should be measured during TX burst (triggering needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds. • Connect the RF probe to the T7503 input. VCO shield has to be removed before measurement. Remember to solder the shield back after the phone repairing.
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RM-1 RF Troubleshooting Nokia Customer Care • Set TX power level to the maximum (“0” in DCS1800/PCS1900) • Measurements can be done with a spectrum analyser and an RF probe. Spectrum analyser centre frequency should be set according the used TX channel (see chapter “Frequency mappings”). • Spectrum analyser RBW and VBW = 1 MHz, Span = 0, sweep time 1 ms. Notice that GSM transmission has pulsed nature and power should be measured during TX burst (triggering needed).
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RM-1 RF Troubleshooting Nokia Customer Care 3.1.2.3 GSM PA (N7502) transmitting correct RF-power? • GSM transmitter has to be active before measurements. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Set TX power level to the minimum (“19” in EGSM900 and “15” in DCS1800/PCS1900) • Measurements can be done with a spectrum analyser and an RF probe. Spectrum analyser centre frequency should be set according the used TX channel (see chapter “Frequency mappings”).
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RM-1 RF Troubleshooting Nokia Customer Care • Disconnect the power supply from the phone and use an ohmmeter to check that the capacitor is not short-circuited. If short-circuit is found replace the capacitor. 3.1.2.3.1.3 Replace inductor L7516 • If replacing doesn’t help then replace GSM PA (N7502) 3.1.2.3.2 Are bias currents coming correctly to the GSM PA (N7502)? Level ok? EGSM: Icont_21 and Icont_22 DCS1800/PCS1900: Icont_31 and Icont_32 • GSM transmitter has to be active before measurements.
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RM-1 RF Troubleshooting Nokia Customer Care 3.1.2.3.2.2 Are capacitors in GSM PA (N7502) bias lines working correctly? EGSM: Icont_21 missing – Replace Vinku Icont_22 missing – C7545 short-circuited? DCS1800/PCS1900: Icont_31 missing – C7556 short-circuited? Icont_32 missing – C7561 short-circuited? • Check that components are in place and solder joints are ok • Disconnect the power supply from the phone and use an ohmmeter to check that capacitors are not short-circuited.
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RM-1 RF Troubleshooting Nokia Customer Care 3.1.3 GSM transmitter frequency correct? • Connect a spectrum analyser to the module test jig (MJ-26) RF connector. • Set GSM Tx ON. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Check if the frequency of the GSM transmitter is as expected. If output signal is not found try to use 500 MHz span setting.
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RM-1 RF Troubleshooting Nokia Customer Care 3.1.3.1.2 TX VCO control voltage VC ok? • GSM transmitter has to be active before TX VCO control voltage VC can be measured. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Measurement can be done with an oscilloscope and a probe. • Connect the probe to R7519. • Typical TX VCO control voltage VC should look somehow similar to figure 6.5.3. DC voltage level should change if TX channel is changed.
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RM-1 RF Troubleshooting Nokia Customer Care • Check the level of the TX VCO frequency in T7503 outputs. The level should be about -30…-35 dBm in both output lines. If the signal level is correct in the input (about -25 dBm) but output level is not as expected then replace T7503. VCO shield has to be removed before measurement. Remember to solder the shield back after the phone repairing. 3.1.3.1.2.
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RM-1 RF Troubleshooting Nokia Customer Care • Spectrum analyser RBW and VBW = 1 MHz, Span = 0, sweep time 1 ms. Notice that GSM transmission has pulsed nature and VCO output power should be measured during TX burst (triggering needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds. • Connect the RF probe to the T7503 input. VCO shield has to be removed before measurement. Remember to solder the shield back after the phone repairing.
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RM-1 RF Troubleshooting Nokia Customer Care 3.1.3.3.2 BB AFC-voltage ok? • Measurement can be done with an oscilloscope and a probe • Connect the probe to R7509 (or C7533) • AFC-voltage may vary between 0.1 - 2.3 V. Typical value is 1.2 V. Phoenix “RF Controls” tool can be used to change the AFC value. Voltage level should be about 0.1 V with AFC value 1024 and about 2.3 V with AFC value 1023. 3.1.3.3.2.
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RM-1 RF Troubleshooting Nokia Customer Care • Use Phoenix testing & tuning software to perform GSM receiver activation and RSSI measurement for proper channels. Procedure is explained in chapter “GSM RX chain activation for manual measurements” (Start “Testing” -> “GSM” -> “RSSI Reading” tool in Phoenix. Select the correct band and channel). • “RSSI Reading” -tool should show quite exact -90 dBm RSSI level. Remember to take into account attenuation between the phone and signal generator.
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RM-1 RF Troubleshooting Nokia Customer Care RF-levels should be about the same on both capacitors. Remember to select the correct band also in Phoenix. • PCS1900: Connect the probe to C7523 or C7525. The RF level should be roughly -85…90 dBm during RX period when input signal in GSM antenna connector is -50 dBm. RF-levels should be about the same on both capacitors. Remember to select the correct band also in Phoenix.
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RM-1 RF Troubleshooting Nokia Customer Care • PCS1900: Connect the probe to L7506. The RF level should be roughly -85 dBm during RX period when input signal in GSM antenna connector is -50 dBm. RF-levels should be about the same on both ends of the inductor. Remember to select the correct band also in Phoenix. 3.2.1.1.
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RM-1 RF Troubleshooting Nokia Customer Care 3.2.2 Are RX-IQ signal waveforms and levels correct? • Measurements can be done with an oscilloscope, a probe and signal generator. • GSM receiver has to be active before RX IQ-signals can be measured. Procedure is explained in chapter “GSM RX chain activation for manual measurements”. • Apply –70 dBm RF signal from a signal generator to the module jig antenna connector and use following frequencies: - EGSM900: 942.46771 MHz (Channel 37) - DCS1800: 1842.
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RM-1 RF Troubleshooting Nokia Customer Care - RFBUSCLK: Connect the probe to J7505. Typical RFBUSCLK -signal is shown in section 6.5.9.1 “RFBUSCLK (GSM RX)” and 6.5.9.2 “RFBUSCLK and RFBUSENA (GSM RX)” - RFBUSENA: Connect the probe to J7506. Typical RFBUSENA -signal is shown in section 6.5.9.2 “RFBUSCLK and RFBUSENA (GSM RX)” - RXRESETX: Connect the probe to J7515. RXRESETX -signal is a constant 2 V DC-signal after GSM or WCDMA transceiver has been activated the first time after phone boot up.
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RM-1 RF Troubleshooting Nokia Customer Care • Check that components are in place and solder joints are ok • Disconnect the power supply from the phone and use an ohmmeter to check that capacitors are not short-circuited. If short-circuit is found replace capacitors mentioned above. If this does not help go to the next step. 3.2.2.3.1.1.1.2 Replace Vinku (N7501) or Hinku (N7500) or both 3.2.2.3.1.1.2 Retu ok? 3.2.2.3.1.
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RM-1 RF Troubleshooting Nokia Customer Care • Disconnect the power supply from the phone and use an ohmmeter to check that capacitors are not short-circuited. If short-circuit is found replace capacitors mentioned above. If this does not help go to the next step. 3.2.2.3.3 RX VCO G7500 ok? 3.2.2.3.4 Replace Hinku (N7500) 3.2.2.4 VXO-voltage ok? (=Vdig). • Measurement can be done with an oscilloscope and a probe • Connect the probe to C7560 (or C7526, C7513) • VXO-voltage should be about 2.5 V 3.2.
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RM-1 RF Troubleshooting Nokia Customer Care 3.2.2.6.1 VXO-voltage ok? (=Vdig). • Measurement can be done with an oscilloscope and a probe. • Connect the probe to C7529 (or C7582) The frequency of the VCTCXO should be quite exactly 38.4 MHz and level about 0.5 - 0.9 Vpp. Example of the correct VCTCXO output signal is presented in figure 6.5.1 "VCTCXO Output (DC Offset 1.24 V)". 3.2.2.6.
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RM-1 RF Troubleshooting Nokia Customer Care 3.2.2.7.2 Replace RX VCO (G7500) 3.2.2.8 Is RX VCO RF-signal coming to the Hinku at all? • GSM receiver has to be active before RX VCO’s output frequency and output level can be measured. Procedure is explained in chapter “GSM RX chain activation for manual measurements”. • Measurements can be done with a spectrum analyser and an RF probe. Spectrum analyser centre frequency should be set according the used RX channel (see chapter “Frequency mappings”).
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RM-1 RF Troubleshooting Nokia Customer Care • Connect the probe to R7501. • Typical RX VCO control voltage VC should look somehow similar to figure 6.5.7 "RX VC in GSM mode (DC Offset 1.5 V)". VC voltage should be between 0.7 - 3.8 V. DC voltage level should change if RX channel is changed. VC is lower on lower channels and higher if higher channel numbers are used. 3.2.2.9.1.1 VCP1-voltage ok? • GSM receiver has to be active before VCP1 voltage can be measured.
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RM-1 RF Troubleshooting Nokia Customer Care 3.2.2.9.1.4 Are components near the RX VCO ok? R7501, C7516, R7505, C7524 and C7522 working correctly? • Check that components are in place and solder joints are ok • Disconnect the power supply from the phone and check resistors resistance values with an ohmmeter. • Use an ohmmeter to check also that capacitors are not short-circuited 3.2.2.9.1.5 Replace Hinku (N7500) or RX VCO (G7500) or both 3.2.2.9.2 Replace RX VCO G7500 3.2.2.
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RM-1 RF Troubleshooting Nokia Customer Care • Check if the frequency of the RX VCO is as expected. If the VCO signal is not found try to use wider span setting. Output level of the VCO should be about -20…-30 dBm. 3.2.2.10.1.1 Replace RX VCO G7500 3.2.2.10.2 Replace balun T7501 3.2.2.11 VCTCXO frequency and output level correct? • Measurement can be done with an oscilloscope and a probe. • Connect the probe to C7529 (or C7582) • The frequency of the VCTCXO should be quite exactly 38.
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RM-1 RF Troubleshooting Nokia Customer Care • VREFCM voltage should be about 780 mV (continuous voltage). 3.2.3.1 Hinku (N7500) RB_EXT voltage ok? • GSM receiver has to be active before Hinku’s RB_EXT voltage can be measured. Procedure is explained in chapter “GSM RX chain activation for manual measurements”. • Measurement can be done with an oscilloscope and a probe. • Connect the probe to R7504. • RB_EXT voltage should be 1.325 – 1.375 V. 3.2.3.
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RM-1 RF Troubleshooting Nokia Customer Care 3.3.2 Are capacitors in GSM PA power supply line in place? • C7569 and C7583 • Check that component is in place and solder joints are ok 3.3.3 Are TX-IQ signals ok? • These current mode signals are not possible to measure, but are tested with self-tests. So if there is no fail in 2.4 “ST_CDSP_TX_IQ_TEST” these signals should be ok. Otherwise Vinku (N7501) or RAP3G (D2800) is faulty. Notice that it is not possible to replace RAP3G ASIC. 3.3.3.1.
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RM-1 RF Troubleshooting Nokia Customer Care • The frequency of the VCTCXO should be quite exactly 38.4 MHz and level about 0.5 - 0.9 Vpp. Example of the correct VCTCXO output signal is presented in figure 6.5.1 "VCTCXO Output (DC Offset 1.24 V)". 3.4 GSM (GMSK) modulation spectrum ok? • GSM transmitter has to be active before measurements. Procedure is explained in chapter “General instructions for TX troubleshooting”.
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RM-1 RF Troubleshooting Nokia Customer Care One example of measured GSM Modulation Spectrum in EGSM900 band is presented in figure 6.5.8 "TX Modulation spectrum (GSM)".. • If modulation spectrum is not as expected separate the phone into parts and place to the MJ-26 module jig (Notice that there are three antenna connectors in the module jig, one for GSM, one for WCDMA and one for Bluetooth. Make sure that all connections are made to the correct RF-connector). 3.4.
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RM-1 RF Troubleshooting Nokia Customer Care 3.4.3 Are TX-IQ signals ok? • These current mode signals are not possible to measure, but are tested with self-tests. So if there is no fail in 2.4 “ST_CDSP_TX_IQ_TEST” these signals should be ok. Otherwise Vinku (N7501) or RAP3G (D2800) is faulty. Notice that it is not possible to replace RAP3G ASIC. 3.4.3.1.1 Vinku (N7501) RB_EXT voltage ok? • GSM transmitter has to be active before Vinku’s RB_EXT voltage can be measured.
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RM-1 RF Troubleshooting Nokia Customer Care 3.5 TX power vs. time ok? This chapter means situation when GSM TX power levels are ok, but burst timing is not correct or power changes during TX burst. • GSM transmitter has to be active before measurements. Procedure is explained in chapter “General instructions for TX troubleshooting”. Note! It is probably needed to change the Tx Data Type in Phoenix to “Random” before this measurement can be performed.
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RM-1 RF Troubleshooting Nokia Customer Care 3.5.2 Does GSM PA (N7502) get correct bias currents? Is the level of bias currents ok? EGSM: Icont_21 and Icont_22 DCS1800/PCS1900: Icont_31 and Icont_32 • GSM transmitter has to be active before measurements. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Set TX power level to the maximum (“5” in EGSM900 and “0” in DCS1800/PCS1900) • Measurements can be done with an oscilloscope and a VOLTAGE probe.
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RM-1 RF Troubleshooting Nokia Customer Care 4. DOES THE PHONE REGISTER TO THE NETWORK AND MAKE A CALL (WCDMA)? • Test against a WCDMA communication tester or real WCDMA network with a proper SIM. 4.1 WCDMA TX power and transmit frequency ok? • Attach the phone to the product specific test jig (AD-23FS) and a spectrum analyser to the RF-coupler. Remember that there are two antenna connectors in the coupler, one for GSM and one for WCDMA.
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RM-1 RF Troubleshooting Nokia Customer Care 4.1.1.1 Is Vinku (N7501) transmitting RF-power at all? • WCDMA transmitter has to be active before Vinku’s output level can be measured. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Measurements can be done with a spectrum analyser and an RF probe. Spectrum analyser centre frequency should be set according the used TX channel (see chapter “Frequency mappings”).
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RM-1 RF Troubleshooting Nokia Customer Care 4.1.1.1.3 Vinku (N7501) regulator voltages VREG1, VREG2 ok? • WCDMA transmitter has to be active before VREG1 and VREG2 voltages can be measured. Procedure is explained in section “General instructions for TX troubleshooting”.. Measurements can be done with an oscilloscope and a probe. • VREG1: Connect the probe to C7543 • VREG2: Connect the probe to C7548 (or C7547) • VREG1 and VREG2 voltage levels should be 2.65 – 2.86 V. Typical value is 2.7 V. 4.1.1.
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RM-1 RF Troubleshooting Nokia Customer Care 4.1.1.1.3.1.2 R7521 and R7504 in place and working correctly? • Check that components are in place and solder joints are ok • Disconnect the power supply from the phone and check R7521 and R7504 resistance values with an ohmmeter. 4.1.1.1.3.1.3 VB_EXT voltage ok? • Measurement can be done with an oscilloscope and a probe. • Connect the probe to C7518. • VB_EXT voltage should be 1.325 – 1.375 V. Typical value is 1.35 V. 4.1.1.1.3.1.3.
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RM-1 RF Troubleshooting Nokia Customer Care 4.1.1.1.4 VXO-voltage ok? (=Vdig). • Measurement can be done with an oscilloscope and a probe • Connect the probe to C7560 (or C7526, C7513) • VXO-voltage should be about 2.5 V 4.1.1.1.5 VCP2-voltage ok? • WCDMA transmitter has to be active before VCP2 voltage can be measured. Procedure is explained in section “General instructions for TX troubleshooting”. • Measurement can be done with an oscilloscope and a probe.
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RM-1 RF Troubleshooting Nokia Customer Care 4.1.1.1.6.1 TX VCO operating voltage VREG2 (VR2) ok? • GSM transmitter has to be active before VREG1 and VREG2 voltages can be measured. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Measurements can be done with an oscilloscope and a probe. • VREG1: Connect the probe to C7543 • VREG2: Connect the probe to C7548 (or C7547) • VREG1 and VREG2 voltage levels should be 2.65 – 2.86 V. Typical value is 2.7 V. 4.1.1.1.6.
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RM-1 RF Troubleshooting Nokia Customer Care • TX control voltage TXC should be constant DC-voltage between 0.1 - 2.3 V. Voltage level should change if TX power is changed. TXC is lower on lower power levels and higher if higher power levels are used. • TXC voltage should be about 1.0 V with power level -50 dBm and about 1.5 V with power level 0 dBm. 4.1.1.1.9.
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RM-1 RF Troubleshooting Nokia Customer Care 4.1.1.1.11.1 VXO-voltage ok? (=Vdig). • Measurement can be done with an oscilloscope and a probe • Connect the probe to C7560 (or C7526, C7513) • VXO-voltage should be about 2.5 V 4.1.1.1.11.2 BB AFC-voltage ok? • Measurement can be done with an oscilloscope and a probe • Connect the probe to R7509 (or C7533) • AFC-voltage may vary between 0.1 - 2.3 V. Typical value is 1.2 V. Phoenix “RF Controls” tool can be used to change the AFC value.
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RM-1 RF Troubleshooting Nokia Customer Care • Connect the RF probe to L7511. The RF-level should be about the same on both ends of the inductor. Check the level with 0 dBm power level (Set start level “0” to Phoenix). • Power level “0” – Vinku output level should be about -40…-48 dBm 4.1.1.2.1.
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RM-1 RF Troubleshooting Nokia Customer Care 4.1.1.3.1.2 PA operating voltage VBAT_PA ok? • WCDMA transmitter has to be active before measurements. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Measurement can be done with an oscilloscope and a probe. • Connect the probe to C7569 (or C7564, C7583) • Voltage level should be 3.05 – 5.4 V. Typical value is 4.0 V. 4.1.1.3.1.2.
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RM-1 RF Troubleshooting Nokia Customer Care • Connect the probe to C7569 (or C7564, C7583) • VBAT_PA voltage level should be 3.05 – 5.4 V. Typical value is 4.0 V. 4.1.1.3.2.3 Is there correct DET_SW_W –voltage coming from Vinku ASIC (N7501)? • WCDMA transmitter has to be active before measurements. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Measurement can be done with an oscilloscope and a probe. • Connect the probe to C7586.
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RM-1 RF Troubleshooting Nokia Customer Care • Disconnect the power supply from the phone and check resistors resistance values with an ohmmeter • Use an ohmmeter also to check that L7514 is conducting DC. 4.1.1.3.2.5 Replace SMPS N7504 4.1.1.3.3 Does WCDMA PA (N7503) get bias currents Icont11 and Icont12? • WCDMA transmitter has to be active before measurements. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Set TX power level to -40 dBm (Set start level to “-40.
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RM-1 RF Troubleshooting Nokia Customer Care 4.1.1.3.3.3 Replace Vinku (N7501) or WCDMA PA (N7503) 4.1.1.3.4 Replace PA (N7503) 4.1.1.4 Does duplex-filter (Z7502) get correct RF-power level from WCDMA PA (N7503)? • WCDMA transmitter has to be active before measurements. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Set TX power level to 0 dBm (Set start level “0” to Phoenix) • Measurements can be done with a spectrum analyser and an RF probe.
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RM-1 RF Troubleshooting Nokia Customer Care 4.1.2.1.2 Vinku (N7501) regulator voltages VREG1, VREG2 ok? • WCDMA transmitter has to be active before VREG1 and VREG2 voltages can be measured. Procedure is explained in chapter “General instructions for TX troubleshooting”. Measurements can be done with an oscilloscope and a probe. • VREG1: Connect the probe to C7543 • VREG2: Connect the probe to C7548 (or C7547) • VREG1 and VREG2 voltage levels should be 2.65 – 2.86 V. Typical value is 2.7 V. 4.1.2.1.
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RM-1 RF Troubleshooting Nokia Customer Care 4.1.2.1.4.3 Retu ok? 4.1.2.1.5 Does Vinku (N7501) WCDMA-modulator get correct supply voltage (VREG2)? • WCDMA transmitter has to be active before measurements. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Measurement can be done with an oscilloscope and a probe. • Connect the probe to R7520 • DC voltage level should be 2.65 – 2.86 V in both R7520 pads. Typical value is 2.7 V. 4.1.2.1.5.
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RM-1 RF Troubleshooting Nokia Customer Care 4.1.2.1.6.1.1 Replace TX VCO G7502 4.1.2.1.6.2 Replace balun T7503 4.1.2.1.7 Replace Vinku (N7501) 4.1.2.2 Is there correct RF-power in the WCDMA PA (N7503) input? • WCDMA transmitter has to be active before measurements. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Set TX power level to 0 dBm (Set start level “0” to Phoenix) • Measurements can be done with a spectrum analyser and an RF probe.
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RM-1 RF Troubleshooting Nokia Customer Care 4.1.2.3 Does WCDMA PA (N7503) transmit correct RF-power? • WCDMA transmitter has to be active before measurements. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Set TX power level to 0 dBm (Set start level “0” to Phoenix) • Measurements can be done with a spectrum analyser and an RF probe. Remember to make correct frequency setting to the spectrum analyser.
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RM-1 RF Troubleshooting Nokia Customer Care 4.1.2.3.2 Does WCDMA PA (N7503) get correct operating voltage Vcc11? • WCDMA transmitter has to be active before measurements. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Set TX power level to -40 dBm (Set start level to “-40.0” in Phoenix) • Measurements can be done with an oscilloscope and a probe. • Connect the probe to C7580. • Vcc11 voltage level should be about 1.5 V.
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RM-1 RF Troubleshooting Nokia Customer Care 4.1.2.3.2.4 Does SMPS get correct control voltage from the WCDMA power detector (signal Vcontrol)? • WCDMA transmitter has to be active before measurements. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Measurement can be done with an oscilloscope and a probe. • Connect the probe to C7591. • Vcontrol signal should be constant DC-voltage. Voltage level should change if TX power is changed.
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RM-1 RF Troubleshooting Nokia Customer Care • Measurements can be done with an oscilloscope and a probe. - Connect the probe to C7579 - WCDMA PA bias current Icont_12 should look as a constant 2.5 - 2.6 V DC-voltage with all power levels. - Connect the probe to C7576 pad. Notice: C7576 is a non-assembled component so the probe should be connected to the pad that can be still found from the PWB. - WCDMA PA bias current Icont_11 should look as a constant 2.5 - 2.6 V DC-voltage with all power levels.
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RM-1 RF Troubleshooting Nokia Customer Care • Connect the probe to Z7502 TX input. The RF level should be roughly -20…-30 dBm. 4.1.2.5 Replace duplex-filter Z502 4.1.3 WCDMA transmitter frequency correct? • Connect a spectrum analyser to the module test jig RF connector. • Set WCDMA Tx ON. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Check if the frequency of the transmitter is as expected. If output signal is not found try to use 500 MHz span setting.
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RM-1 RF Troubleshooting Nokia Customer Care 4.1.3.1.2 TX VCO control voltage VC ok? • WCDMA transmitter has to be active before TX VCO control voltage VC can be measured. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Measurement can be done with an oscilloscope and a probe. • Connect the probe to R7519. • TX VCO control voltage VC should be constant DC-voltage between 0.7 - 3.8 V. DC voltage level should change if TX channel is changed.
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RM-1 RF Troubleshooting Nokia Customer Care 4.1.3.1.2.4 Are components near the TX VCO ok? C7571, R7519, R7523, C7573 and C7568 working correctly? • Check that components are in place and solder joints are ok • Disconnect the power supply from the phone and check resistors resistance values with an ohmmeter. • Use an ohmmeter to check also that capacitors are not short-circuited 4.1.3.1.2.5 Replace Vinku (N7501) or TX VCO (G7502) or both 4.1.3.1.3 Replace TX VCO G7502 4.1.3.
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RM-1 RF Troubleshooting Nokia Customer Care 4.1.3.2.1.1 Replace TX VCO G7502 4.1.3.2.2 Replace balun T7503 4.1.3.3 VCTCXO frequency and output level ok? • Measurement can be done with an oscilloscope and a probe. • Connect the probe to C7529 (or C7582) • The frequency of the VCTCXO should be quite exactly 38.4 MHz and level about 0.5 - 0.9 Vpp. Example of the correct VCTCXO output signal is presented in figure 6.5.1 "VCTCXO Output (DC Offset 1.24V)". 4.1.3.3.1 VXO-voltage ok? (=Vdig).
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RM-1 RF Troubleshooting Nokia Customer Care • Use Phoenix testing & tuning software to perform WCDMA receiver activation and RSSI measurement for channel 10700. Procedure is explained in chapters “WCDMA RX chain activation for manual measurement” and “WCDMA RSSI measurement”. • “Rx Power Measurement” tool should show quite exact -90 dBm RSSI level. Remember to take into account attenuation between the phone and signal generator. • Increase signal generator RF level to -60 dBm.
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RM-1 RF Troubleshooting Nokia Customer Care 4.2.1.1.1 Replace filter Z7502 4.2.1.2 Replace balun T7500 4.2.2 Hinku WCDMA LNA output ok? • WCDMA receiver has to be active before measurements. Procedure is explained in chapter “WCDMA RX chain activation for manual measurements”. • Connect an RF-generator to the WCDMA-antenna connector • Set RF-generator frequency to 2141.0 MHz (unmodulated signal) • Measurements can be done with a spectrum analyser and an RF probe.
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RM-1 RF Troubleshooting Nokia Customer Care • Check RX I and RX Q -signals in following test points: - RX I (positive): Connect the probe to test point J7508 - RX I (negative): Connect the probe to test point J7509 - RX Q (positive): Connect the probe to test point J7510 - RX Q (negative): Connect the probe to test point J7511 • Signal in all four test points should be about the same. Output should be a sine wave with frequency 100 kHz and amplitude about 650 mV.
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RM-1 RF Troubleshooting Nokia Customer Care 4.2.4.3 Hinku (N7500) regulator voltage VR1 ok? • WCDMA receiver has to be active before Hinku’s VR1 voltage can be measured. Procedure is explained in chapter “WCDMA RX chain activation for manual measurements”. • Measurements can be done with an oscilloscope and a probe. • Connect the probe to C7504 (or C7505) • VR1 voltage level should be 2.65 – 2.86 V. Typical value is 2.7 V. 4.2.4.3.
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RM-1 RF Troubleshooting Nokia Customer Care • Disconnect the power supply from the phone and check R7521 and R7504 resistance values with an ohmmeter. 4.2.4.3.1.3 VB_EXT voltage ok? • Measurement can be done with an oscilloscope and a probe. • Connect the probe to C7518. • VB_EXT voltage should be 1.325 – 1.375 V. Typical value is 1.35 V. 4.2.4.3.1.3.
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RM-1 RF Troubleshooting Nokia Customer Care • The frequency of the VCTCXO should be quite exactly 38.4 MHz and level about 0.5 - 0.9 Vpp. Example of the correct VCTCXO output signal is presented in figure 6.5.1 "VCTXO Output (DC Offset 1.24V)". 4.2.4.5 VCP1-voltage ok? • WCDMA receiver has to be active before VCP1 voltage can be measured. Procedure is explained in chapter “WCDMA RX chain activation for manual measurements”. • Measurement can be done with an oscilloscope and a probe.
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RM-1 RF Troubleshooting Nokia Customer Care • Connect the probe to C7504 (or C7505) VR1 voltage level should be 2.65 – 2.86 V. Typical value is 2.7 V. 4.2.4.6.2 Replace RX VCO (G7500) 4.2.4.7 Is RX VCO RF-signal coming to the Hinku at all? • WCDMA receiver has to be active before RX VCO’s output frequency and output level can be measured. Procedure is explained in chapter “WCDMA RX chain activation for manual measurements”. • Measurements can be done with a spectrum analyser and an RF probe.
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RM-1 RF Troubleshooting Nokia Customer Care 4.2.4.8.1.1 VCP1-voltage ok? • GSM receiver has to be active before VCP1 voltage can be measured. Procedure is explained in chapter “WCDMA RX chain activation for manual measurements”. • Measurement can be done with an oscilloscope and a probe. • Connect the probe to C7507. • VCP1 voltage should be about 4.75 V. 4.2.4.8.1.1.
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RM-1 RF Troubleshooting Nokia Customer Care • Check that components are in place and solder joints are ok • Disconnect the power supply from the phone and check resistors resistance values with an ohmmeter. • Use an ohmmeter to check also that capacitors are not short-circuited 4.2.4.8.1.4 Replace Hinku (N7500) or RX VCO (G7500) or both 4.2.4.8.2 Replace RX VCO G7500 4.2.4.
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RM-1 RF Troubleshooting Nokia Customer Care 4.2.4.11 VCTCXO frequency and output level correct? • Measurement can be done with an oscilloscope and a probe. • Connect the probe to C7529 (or C7582) • The frequency of the VCTCXO should be quite exactly 38.4 MHz and level about 0.5 - 0.9 Vpp. Example of the correct VCTCXO output signal is presented in figure 6.5.1 "VCTCXO Output (DC Offset 1.24V)". 4.2.4.11.1 VXO-voltage ok? (=Vdig).
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RM-1 RF Troubleshooting Nokia Customer Care 4.2.5.2 Replace Hinku (N7500) • Also RAP3G can be faulty but it’s not possible to replace this component 4.2.6 RAP3G faulty? • Not possible to replace! 4.3 WCDMA modulation spectrum and ACLR ok? • WCDMA transmitter has to be active before measurements. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Measurement can be done with a WCDMA transmitter tester or other WCDMA communication tester.
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RM-1 RF Troubleshooting Nokia Customer Care • Set TX power level to -40 dBm (Set start level to “-40.0” in phoenix) • Measurements can be done with an oscilloscope and a probe. - Connect the probe to C7579 - WCDMA PA bias current Icont_12 should look as a constant 2.5 - 2.6 V DC-voltage with all power levels. - Connect the probe to C7576 pad. Notice: C7576 is a non-assembled component so the probe should be connected to the pad that can be still found from the PWB.
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RM-1 RF Troubleshooting Nokia Customer Care • Check the level of the VCO frequency in T7503 outputs. The level should be about -30…-35 dBm in both output lines. If the signal level is correct in the input (about -25 dBm) but output level is not as expected then replace T7503. VCO shield has to be removed before measurement. Remember to solder the shield back after the phone repairing. 4.3.5 Replace Vinku (N7501) or WCDMA PA (N7503) or both 5.
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RM-1 RF Troubleshooting Nokia Customer Care 5.4 GSM (GMSK) modulation spectrum ok? • See section 3.4. “GSM (GMSK) modulation spectrum ok?” 5.5 TX power vs. time ok? • See section 3.5. “TX power vs. time ok?” 6. DOES THE PHONE HAVE A RELIABLE CONNECTION TO THE NETWORK (WCDMA)? This chapter means situation when the phone registers to the WCDMA-network and is capable to make a call, but the call is not reliable even if WCDMA-network field strength is strong.
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RM-1 RF Troubleshooting Nokia Customer Care 6.2 WCDMA TX power and transmit frequency ok? • See section 4.1. “WCDMA TX power and transmit frequency ok?” 6.3 WCDMA Transmitter error vector magnitude ok? • This test needs a WCDMA communication tester and if there is no that kind of tester available continue troubleshooting in section 4.3 “WCDMA modulation spectrum and ACLR ok?” • Attach the phone to the product specific test jig (AD-23) and the WCDMA communication tester to the RF-coupler.
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RM-1 RF Troubleshooting Nokia Customer Care 6.3.5 Is TX VCO signal level in the T7503 output high enough? • WCDMA transmitter has to be active before TX VCO’s output level can be measured. Procedure is explained in chapter “General instructions for TX troubleshooting”. • Measurements can be done with a spectrum analyser and an RF probe. Spectrum analyser centre frequency should be set according the used TX channel (see chapter “Frequency mappings”). RBW and VBW = 1 MHz, Span ≤ 200 kHz.
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RM-1 RF Troubleshooting Nokia Customer Care 6.5 Troubleshooting pictures 6.5.1 VCTCXO Output (DC Offset 1.24 V) 6.5.2 TXC in GSM mode (DC Offset 0 V) Issue 1 7A - 108 Company Confidential Copyright © 2004 Nokia.
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RM-1 RF Troubleshooting Nokia Customer Care 6.5.3 TX VC in GSM mode (DC Offset 1.8 V) DC value changes if channel or band is changed. Upper figure has been taken in EGSM900 band and on channel 37. 6.5.4 Icont_21/Icont_22 (DC Offset 1.2 V) Issue 1 7A - 109 Company Confidential Copyright © 2004 Nokia.
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RM-1 RF Troubleshooting Nokia Customer Care 6.5.6 GSM RX IQ (DC Offset 0.4 V) The lower figure is a detail from the upper figure (detail area marked with a white box). Issue 1 7A - 111 Company Confidential Copyright © 2004 Nokia.
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RM-1 RF Troubleshooting Nokia Customer Care 6.5.7 RX VC in GSM mode (DC Offset 1.5 V) DC value changes if channel or band is changed. Upper figure has been taken in EGSM900 band and on channel 37. Issue 1 7A - 112 Company Confidential Copyright © 2004 Nokia.
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RM-1 RF Troubleshooting Nokia Customer Care 6.5.8 TX Modulation spectrum (GSM) Example of the TX modulation spectrum (GMSK) in EGSM900 band. Issue 1 7A - 113 Company Confidential Copyright © 2004 Nokia.
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RM-1 RF Troubleshooting Nokia Customer Care 6.5.9 RFBUS 6.5.9.1 RFBUSCLK (GSM RX) The lower figure is a detail from the upper figure (detail area marked with a white box). Issue 1 7A - 114 Company Confidential Copyright © 2004 Nokia.
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RM-1 RF Troubleshooting Nokia Customer Care 6.5.9.3 RFBUSDAT (GSM RX) The lower figure is a detail from the upper figure (detail area marked with a white box). Issue 1 7A - 116 Company Confidential Copyright © 2004 Nokia.