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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Table of Contents Introduction to RF troubleshooting..........................................................................................................................................1–5 RF key component placement.....................................................................................................................................................1–5 Troubleshooting test point locations.............................
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Nokia Customer Care RM-84/99 RF Troubleshooting and Manual Tuning Guide Figure 6 Activating Rx Control window in Phoenix...........................................................................................................1–11 Figure 7 Rx Control window......................................................................................................................................................1–12 Figure 8 RF Controls window......................................................................
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RM-84/99 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-shielde
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Troubleshooting test point locations Test points for spectrum analyzer Figure 2 Test point locations for spectrum analyzer Issue 1 Company Confidential Copyright ©2005 Nokia. All Rights Reserved.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Test points for oscilloscope Figure 3 Test points for oscilloscope - bottom Page 1–8 Company Confidential Copyright ©2005 Nokia. All Rights Reserved.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 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. 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.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 4. In the RSSI Reading window, select the appropriate band and channel. Figure 5 RSSI Reading window 5. To start measurement/activate GSM Rx chain, click the Start button. Results RSSI reading values of the selected band and channel are displayed. WCDMA Rx chain activation for manual measurement Steps 1. Start Phoenix service software. 2. From the Testing menu, choose WCDMA and Rx Control.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Figure 7 Rx Control window • From the AGC Mode pane, select Algorithm. • Set Channel to 10700. • Set AFC Algorithm to OFF (Default = OFF). Next action When settings are ready, click Start to activate them. If settings are changed later on (for example, you give a new channel number), you will need to click Stop and Start again.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 3. To perform the measurement, click Start. Transmitter troubleshooting General instructions for Tx troubleshooting Context • • • • Tx troubleshooting requires Tx operation. Do not transmit on frequencies that are in use! Transmitter can be controlled in the local mode for diagnostic purposes. The most useful Phoenix tool for GSM transmitter testing is "RF Controls"; in WCDMA transmitter testing the best tool is "Tx Control".
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Make sure that all connections are made to the correct RF connector. Normally a spectrum analyser is used as measurement equipment. Note: The maximum input power of a spectrum analyser is +30 dBm. To prevent any damage, it is recommended to use 10 dB attenuator on the spectrum analyzer input. 4. Set Tx on. i ii iii iv Set the phone module to the test jig and start Phoenix service software. Initialize connection to the phone.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Figure 8 RF Controls window • WCDMA troubleshooting i From the Testing menu, activate the Tx Control window:Testing -> WCDMA -> Tx Control . ii In the Tx Control window: • • • • • • • • • Issue 1 Select the Algorithm mode tab. Set Start level to “0” dBm (Default = “0”). Set Step size, Step count and Sequence to “0” (Default = “0”). Set Scrambling code class to “LONG” (Default = “LONG”).
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Figure 9 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 antenna functionality The main antenna has two separate antenna elements: GSM and WCDMA. Note: RM-99 only has the GSM antenna element. In the GSM antenna, there is one Feed and two GND contacts.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Figure 10 Feed and GND spots of the main antenna 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. The antenna is functioning normally when the contacts function (RDC = 0 ohm) and the antenna is visually intact. Figure 11 BT antenna RF tunings Introduction to RF tunings Phone RF is tuned in production.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Note: RF calibration is always performed with the help of a product-specific module jig, never with an RF coupler. Using an RF coupler in the calibration phase will cause a complete mistuning of the RF side. Important: After RF component changes, always use autotuning. Manual tunings are only required in rare cases. Cable and adapter losses RF cables and adapters have some losses.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide 3. From the Tools menu, choose Options -> GPIB Card. 4. In the Card Type line, select CEC8Bit, then click Start. Nokia Customer Care After clicking Start, the name of the communication tester appears in the list of found Listeners. 5. To specify the cable loss from module jig to the communication tester, choose "Set Loss" from the Tuning menu. Issue 1 Company Confidential Copyright ©2005 Nokia. All Rights Reserved.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 6. In the Set Loss window, click the Jig tab and select the right jig for the phone. 7. Click the Cable tab and add the extra cable attenuation. Page 1–20 Company Confidential Copyright ©2005 Nokia. All Rights Reserved.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide 8. Nokia Customer Care To start autotuning, choose Auto-Tune from the Tuning menu. 9. In the Auto-Tune window, click Options. 10. 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 ©2005 Nokia. All Rights Reserved.
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Nokia Customer Care RM-84/99 RF Troubleshooting and Manual Tuning Guide 11. Connect the phone's WCDMA RF port to the communication tester, and click Tune. Page 1–22 Company Confidential Copyright ©2005 Nokia. All Rights Reserved.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 12. Change the phone's RF adapter from WCDMA port to GSM port. 13. To complete the RF autotuning, click OK. Results "Autotuning completed successfully" message appears. RF manual tuning guide Required manual tunings after component changes Important: After RF component changes, always use autotuning. Manual tunings are only required in rare cases. If, however, manual tuning is used, only relevant tunings should be performed.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Changed component Perform the following tunings Tx RF ASIC Vinku (N7501) RF Channel Filter Calibration, Tx IQ Tuning, Tx Power Level Tuning, Temperature Sensor Calibration, TX AGC & Power Detector, Tx Band Response Calibration, Tx LO Leakage RX RF ASIC Hinku (N7500) RF Channel Filter Calibration, Rx Calibration, Rx Band Filter Response Compensation, Rx AM Suppression, Rx AGC Alignment, Rx Band Response Calibration Any component i
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Results Figure 12 RF channel filter calibration typical values PA (power amplifier) detection Context PA detection procedure detects which PA manufacturer is used for GSM and WCDMA PAs. If PA is changed or if the permanent memory (PMM) data is corrupted, PA detection has to be performed before Tx tunings. Steps 1. 2. 3. 4. 5. From the "Operating mode" dropdown menu, set mode to "Local". From the Tuning menu, choose "PA Detection".
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 3. Click "Tune". Table 2 Temperature sensor calibration tuning limits Min Typ Max Unit -20 -4 20 V 4. To save the calibration values, click "Write". 5. 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-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 6. Click Start (if not active already). 7. 8. Click Calibrate. 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! Issue 1 Company Confidential Copyright ©2005 Nokia. All Rights Reserved.
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RM-84/99 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 3 RF tuning limits in Rx calibration Min Typ Max Unit 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 GSM900 RSSI0 GSM1800 RSSI0 GSM1900 RSSI0 Page 1–28 Company Confidential Copyright ©2005 Nokia. All Rights Reserved.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 11. To save values to the phone, click "Save & Continue". 12. Repeat steps 3 to 8 for GSM1800 and GSM1900. Issue 1 Company Confidential Copyright ©2005 Nokia. All Rights Reserved.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Results Rx band filter response compensation (GSM) Before you begin Rx Calibration must be performed before the Rx Band Filter Response Compensation. Context On each GSM Rx band, there is a band rejecting filter in front of the HINKU front end. The amplitude ripple caused by these filters causes ripple to the RSSI measurement and therefore calibration is needed. The calibration has to be repeated for each GSM band. Steps 1. 2. 3.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide 4. From the Tuning menu, choose GSM -> Rx Band Filter Response Compensation. 5. 6. In the Tuning mode pane, select Manual. Click Start. Issue 1 Company Confidential Copyright ©2005 Nokia. All Rights Reserved.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide 8. Nokia Customer Care Connect the signal generator to the phone and set frequency and amplitude as instructed in the "Rx Band Filter Response Compensation for EGSM900" popup window. 9. To perform tuning, click OK. 10. Go through all 9 frequencies. 11. Check that the tuning values are within the limits specified in the following 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-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Min Typ Max Unit Ch. 90 / 953.06771 MHz -3 0 5 dB Ch. 114 / 957.86771 MHz -3 0 5 dB 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.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Min Typ Max Unit Ch. 794 / 1986.66771 MHz -3 0 5 dB Ch. 810 / 1989.86771 MHz -3 0 5 dB Ch. 835 / 1994.86771 MHz -10 -1 5 dB 12. If the values are within the limits, click "Save & Continue". 13. Repeat the steps 4 to 10 for GSM1800 and GSM1900. Issue 1 Company Confidential Copyright ©2005 Nokia. All Rights Reserved.
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Nokia Customer Care RM-84/99 RF Troubleshooting and Manual Tuning Guide Results Rx AM suppression (GSM) Context Rx AM suppression is used to tune the AM suppression capabilities of the GSM receiver. AM suppression is related to ability of the receiver to operate when there is a disturbing AM modulated signal near the received channel signal frequency. RFIC has tunable compensation circuit which has an effect on the AM suppression ability.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 4. 5. Select GSM900 band. Click Start. 6. Connect the signal generator to the phone according to the frequency and modulation parameters displayed in the pop-up window: Frequency 952.46771MHz / 1852.86771MHz / 1970.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 7. Click OK. 8. Check that RSSI level value is between the limits presented in the following table. Table 4 RSSI level values 9. Band Min Max Unit GSM900 -115 -90 dB GSM1800 -115 -85 dB GSM1900 -115 -100 dB To proceed to the next band, click "Next". Page 1–38 Company Confidential Copyright ©2005 Nokia. All Rights Reserved.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 10. To end the tuning, click "Finish" and "Close". GSM transmitter tunings Tx IQ tuning (GSM) Context • The Tx path branches to I and Q signals at RF I/Q modulator. Modulator and analog hardware located after it cause unequal amplitude and phase disturbance to I and Q signal paths. Tx IQ tuning balances the I and Q branches. • Tx IQ tuning must be performed on all GSM bands. Steps 1.
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RM-84/99 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. Page 1–40 Company Confidential Copyright ©2005 Nokia. All Rights Reserved.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 5. When the values have been written to the phone memory, click Next to change to the next band. 6. When all bands have been tuned, click Finish and Close to end the tuning procedure. Next action Tuning sliders should be close to the center of the scale after the tuning and within the limits specified in the following table. If they are not within the limits, check Tx IQ quality manually.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Tx power level tuning (GSM) Context Because of variations at IC process and discrete component values, the actual transmitter RF gain of each phone is different. Tx power level tuning is used to find out mapping factors called 'power coefficients’. These adjust the GSM transmitter output power to fulfill the specifications.
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RM-84/99 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. Check that the coeffiecient values are within the limits specified in the following table. Min Typ Max 0.45 0.626 0.73 GSM900 EDGE off PL5 coefficient PL15 coefficient PL19 coefficient 0.234 0.12 0.195 0.3 0.35 0.419 0.6 GSM900 EDGE on PL8 coefficient PL15 coefficient PL19 coefficient 0.247 0.12 0.204 0.3 0.45 0.51 0.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Min PL11 coefficient Typ Max 0.23 PL15 coefficient 0.12 0.194 0.3 0.45 0.482 0.7 GSM1900 EDGE off PL0 coefficient PL11 coefficient 0.218 PL15 coefficient 0.12 0.184 0.3 0.35 0.377 0.6 GSM1900 EDGE on PL2 coefficient PL11 coefficient 0.23 PL15 coefficient 0.12 0.193 0.3 8. If the values are within the limits, click "Save & Continue" to proceed to the next band and click Start. 9.
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RM-84/99 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 "RX AGC Calibration" pop-up window and click OK: Frequency: 2141MHz Level: –51 dBm + cable and adapter attenuations Modulation: FM Deviation: 500 kHz Modulation frequency: 50 kHz 5. Check that the “Rx Chain” value in “Tuning Results” is within the limits presented in the following table. Min Typ Max Unit RX chain -6 1.5 3.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide High freq Nokia Customer Care Min Typ Max -5 -0.7 4.0 5 Unit i If the Rx gain is acceptable, click Yes to save the results to the phone. 6. To close the tuning window, click Close. Rx band response calibration (WCDMA) Context There is a band rejecting filter for each WCDMA Rx band between the front end LNA and the mixer of HINKU.
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RM-84/99 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: –48 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-84/99 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 "Operating mode" dropdown menu, set mode to "Local". From the Tuning menu, choose WCDMA -> Rx AGC Alignment. Click Start. Check the “Tune Rx Band Response” checkbox and click Tune. • Setup the signal generator according to the values in the pop-up window: Frequency list: 2113.4 MHz, 2141 MHz and 2166.
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RM-84/99 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 end the calibration, click Close.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide 6. 7. Nokia Customer Care 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. The measured power levels must be monotonously decreasing.
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RM-84/99 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. Adjust the spectrum analyzer according to the following settings: 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.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Figure 13 High burst measurement 13. In the "High Burst" pane, click Calculate. 14. Check that the calculated values are within the limits specified in the following table: Min Max C0-high -0.5 5 C1-high -50 50 C2-high 400 900 C0-mid -0.7 0.7 C1-mid 0 50 C2-mid 400 900 C0-low -4 4 C1-low -400 440 C2-low -10000 15000 Det-k 0 800 Det-b -1000 1000 15. To save the coefficients to the phone, click Write.
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RM-84/99 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: 1950.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 22. Measure the WCDMA output power. It should be around 21 dBm. 23. Click RF Stop and uncheck the "Max power limit" check box. 24. Repeat steps 19 to 23 for levels +19, +7, 0, -20 and –40 dBm levels. The measured output power may not differ more than +-2 dB from the requested value at level +19dBm and no more than +-4dB on lower levels. Remember to stop the RF before sending new data.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Video bandwidth: more than 4.7 MHz (i.e. 5MHz) Trigger: Free run Markers: 1922.4 MHz, 1950.0 MHz and 1977.6 MHz 4. Click Start and OK. 5. 6. 7. 8. 9. 10. 11. Adjust the "Mid Channel Power Level" to 21.0 dBm. Click Accept and OK. Read the marker power level on the low channel and fill it in to the “Low Power Level” line. Click Accept and OK.
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RM-84/99 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Steps 1. From the "Operating mode" dropdown menu, set mode to "Local". 2. From the Tuning menu, choose WCDMA -> Tx LO Leakage. 3. Click Tune. 4. To end the tuning, click Close. Issue 1 Company Confidential Copyright ©2005 Nokia. All Rights Reserved.
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Nokia Customer Care Appendix A: RF Troubleshooting Table of Contents 1. 2. Using these instructions...................................................................................................................4 RF Self tests .....................................................................................................................................5 2.1 RF-BB interface (ST_CDSP_RF_BB_IF_TEST) ....................................................................................7 2.
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Appendix A: RF Troubleshooting Nokia Customer Care 4.1.2 Does WCDMA TX transmit enough RF-power and power levels otherwise ok? ....................85 4.1.3 WCDMA transmitter frequency correct? .............................................................................94 4.2 Does the phone give realistic RSSI-values? ...............................................................................99 4.2.1 Is Hinku ASIC (N7500) receiving RF-power correctly from the WCDMA-antenna connector? 99 4.2.
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Nokia Customer Care Appendix A: RF Troubleshooting 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 section 4.3.
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Appendix A: RF Troubleshooting Nokia Customer Care 2. RF SELF TESTS The RF part of the device 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 can not 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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Nokia Customer Care Appendix A: RF Troubleshooting 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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Appendix A: RF Troubleshooting Nokia Customer Care 2.1 RF-BB interface (ST_CDSP_RF_BB_IF_TEST) RF_BB_IF test (86) tests the functionality of the RAP3G/HINKU/VINKU serial interface & reset lines. If this test fails, it means that there’s a problem programming Hinku and or Vinku and all of the following tests cannot give correct data.
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Nokia Customer Care Appendix A: RF Troubleshooting ST_CDSP_RF_BB_IF_TEST FAILURE PAGE_2 Incorrect version number read from the TX_IC (0x0008) NO Register -read cycle Registerwrite write-read cycle failed (RX) failed (RX) (0x0004)(0x0004) YES Propable Propablecause: Poorsolder/faulty solder/FaultyVinku VINKU Poor Otherpossible possiblereasons: reasons: Other VDIG connection between VDIG connection between RETU & VINKU RETU & VINKU NO TX_IC is not reset correctly (0x0010) (0x0010) NO Register -re
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Appendix A: RF Troubleshooting Nokia Customer Care 2.2 Supply test for Hinku and Vinku (ST_CDSP_RF_SUPPLY_TEST) This self test includes two different RF-supply self tests…one for Vinku and one for Hinku: RF_SUPPLY_TEST (VINKU) (83) tests the functionality of Vinku’s bias block, regulators, reference voltage line and, supply connections. If these fail, all other Vinku tests can/will fail. Also many Hinku tests can be affected and can’t be trusted.
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Nokia Customer Care Appendix A: RF Troubleshooting ST_CDSP_RF_SUPPLY_TEST, VINKU ERRORS, PAGE2 VINKU ERRORS, PAGE2 VB_EXT line fail (0x0001) NO NO YES YES Does also Hinku’s VB_EXT line fail (0x0001) VXO supply fail (0x0002) NO Propablecause: cause: Propable FaultyVinku/Test Vinku /Testerror error Faulty testsbeen havepassed been so (BB/IF (BB/IF tests have passed hasSo tothe be OK! VDIG hassotoVDIG be OK! Soproblem the problem is intest themux) testmux) is in the YES YES YES VBAT1 (VBAT_ASIC
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Appendix A: RF Troubleshooting Nokia Customer Care ST_CDSP_RF_SUPPLY_TEST, ST_CDSP_RF_SUPPLY_TES VINKU ERRORS, PAGEPAGE 3 VINKU ERRORS, VRFTX FailVRFTX fail (0x0010) (0x0010) VVGA FailVVGA fail (0x0020)(0x0020) NO Propable cause: Propable cause: Poor solder Poor solder Propable cause: cause: Propable Poorsolder solder Poor Otherpossible possiblereasons: reasons: Other YES Propable cause: Propable cause: Poor solder Poor solder Other possible reasons: Othercapacitor possibleat reasons: Faulty VPRE
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Nokia Customer Care Appendix A: RF Troubleshooting ST_CDSP_RF_SUPPLY_TEST ST_CDSP_RF_SUPPLY_TES HINKU ERRORS HINKU ERRORS VB_EXTVB_EXT fail Fail (0x0001) (0x0001) VDIG FailVDIG Fail (0x0002) (0x0002) NO NO VBAT1 or Fail VR1 Fail VBAT1 or VR1 (0x0004)(0x0004) YES YES YES Propable cause: Propable cause: Poor soldering soldering ininHINKU Poor Hinku VMIX Fail (0x0008) NO YES Propable Propablecause: cause: Poor solder in Hinku Poor solder in HINKU Propablecause: Propable cause: Poor Poorsolder/Fa
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Appendix A: RF Troubleshooting Nokia Customer Care 2.3 TX IQ self test (ST_CDSP_TX_IQ_TEST) TX_IQ_TEST (85) checks that the TXIQ lines between RAP & Vinku are properly connected. If this fails also power tests and RXIQ loopback will fail.
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Nokia Customer Care Appendix A: RF Troubleshooting 2.4 TXC Data test (ST_TXC_DATA_TEST) TXC_DATA_TEST (74) tests that the TXC line between RETU & VINKU is properly connected. If this fails also TX power tests will fail.
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Appendix A: RF Troubleshooting Nokia Customer Care 2.5 WCDMA power detector biasing self test (ST_CDSP_PWR_DETECTOR_BIAS_TEST) POWER_DETECTOR_BIAS_TEST (82) tests the biasing of the power detector. If this fails, also the power tests will fail/can’t be trusted. Test covers: Vinku (N7501) WCDMA power detector biasing circuit functionality, Retu (N2200) WTXDET input.
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Nokia Customer Care A-16 Appendix A: RF Troubleshooting • Measurement can be done with an oscilloscope and a probe. • Connect the probe to R7531. • WTXDET signal should be constant DC-voltage. Voltage level should change if TX power is changed. Vcontrol is lower on lower power levels and higher if higher power levels are used. • 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.
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Appendix A: RF Troubleshooting Nokia Customer Care 2.6 RX PLL phase lock self test (ST_CDSP_RX_PLL_PHASE_LOCK_TEST) RX_PLL_LOCK_TEST (79) tests the functionality of RX PLL. If this fails, none of the RX related measurements cannot be trusted.
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Nokia Customer Care Appendix A: RF Troubleshooting 2.7 TX PLL phase lock self test (ST_CDSP_TX_PLL_PHASE_LOCK_TEST) TX_PLL_LOCK_TEST (80) tests the functionality of RX PLL. If this fails also the TX power tests will fail.
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Appendix A: RF Troubleshooting Nokia Customer Care 2.8 WCDMA transmitter self test (ST_CDSP_WCDMA_TX_POWER_TEST) TX_WCDMA_POWER_TEST (75) checks the output power of the WCDMA transmitter.
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Nokia Customer Care Appendix A: RF Troubleshooting 2.9 RX IQ loop back self test (ST_CDSP_RX_IQ_LOOP_BACK_TEST) RX_IQ_LOOPBACK (81) tests that the RXI lines & VREFCM line between RAP & HINKU are connected.
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Appendix A: RF Troubleshooting Nokia Customer Care 2.10 GSM transmitter self test (ST_CDSP_GSM_TX_POWER_TEST) TX_GSM_POWER_TEST (77) checks the output power of the GSM transmitter. 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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Nokia Customer Care Appendix A: RF Troubleshooting 2.11 Error Code Interpretation Examples This section presents three different examples of RF error code interpretation. 2.11.
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Appendix A: RF Troubleshooting Nokia Customer Care Bit mask “---- ---- 1--- ----“ = ”0x0080” Bit mask “---- ---1 ---- ----“ = “0x0100” Bit mask “---- --1- ---- ----“ = ”0x0200” Bit mask “---- 1--- ---- ----“ = ”0x0800” Troubleshooting can be continued with ST_CDSP_RF_SUPPLY_TEST VINKU flowchart because there are errors with eight VINKU error codes.
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Nokia Customer Care Appendix A: RF Troubleshooting 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 and a spectrum analyser to the RF-coupler. Coupler attenuation should be also taken into account during measurements. • Set GSM Tx ON.
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Appendix A: 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 signal is found to be on wrong frequency or frequency is not stabile, see section, 3.1.3. "GSM transmitter frequency correct". 3.1.1.1 Is Vinku (N7501) transmitting RF-power at all? • GSM transmitter has to be active before Vinku’s output level can be measured. Procedure is explained in section “Transmitter troubleshooting”.
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Nokia Customer Care • Appendix A: RF Troubleshooting Disconnect the power supply from the phone and use an ohmmeter to check that inductor is conducting DC. 3.1.1.1.2 RFBUS signals ok? • GSM receiver has to be active before RFBUS signals can be measured. Procedure is explained in section “GSM RX chain activation for manual measurements”. Also WCDMA/GSM transmitter and WCDMA receiver activation can be used for the measurement but then RFBUS -signals don’t necessarily look like in figures mentioned below.
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Appendix A: RF Troubleshooting Nokia Customer Care • Measurement can be done with an oscilloscope and a probe. • Connect the probe to R7521. • RB_EXT voltage should be 1.325 – 1.375 V. 3.1.1.1.3.1.1 VREFRF01-voltage ok? • Measurement can be done with an oscilloscope and a probe. • Connect the probe to R7503. • VREFRF01 voltage should be 1.325 – 1.375 V. Typical value is 1.35 V. 3.1.1.1.3.1.1.1 Desolder R7503.
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Nokia Customer Care Appendix A: RF Troubleshooting help go to the next step. 3.1.1.1.3.1.3.3 Replace Vinku (N7501) or Hinku (N7500) or both 3.1.1.1.3.1.4 Replace Vinku (N7501) 3.1.1.1.3.
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Appendix A: RF Troubleshooting Nokia Customer Care • Connect the probe to C2221 (or C7550). • 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 VCP2-line 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.
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Nokia Customer Care Appendix A: RF Troubleshooting 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. • Check the level of the TX VCO frequency in T7503 outputs. The level should be about -30…-35 dBm in both output lines.
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Appendix A: RF Troubleshooting Nokia Customer Care short-circuited. If short-circuit is found replace the capacitor. 3.1.1.1.9.3 Retu ok? 3.1.1.1.10 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 1.24 V)".. 3.1.1.
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Nokia Customer Care Appendix A: RF Troubleshooting frequency settings to the spectrum analyser. Spectrum analyser centre frequency should be set according the used TX channel (see section “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). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.
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Appendix A: RF Troubleshooting Nokia Customer Care needed). Another possibility is to use following settings: RBW = VBW = 1 MHz, Span 200 kHz and sweep time at least 2.5 seconds. • GSM1800 or GSM1900: Connect the probe to R7512 input. The RF level should be roughly -20…30 dBm. 3.1.1.2.3.1 Replace balun T7502 3.1.1.2.4 GSM1800/GSM1900: Replace attenuator R7512 3.1.1.3 Does GSM PA (N7502) transmit RF-power at all? • GSM transmitter has to be active before measurements.
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Nokia Customer Care Appendix A: RF Troubleshooting • Check that the component is in place and solder joints are ok • 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. 3.1.1.3.1.3 Replace inductor L7516 • If replacing does not help, replace GSM PA (N7502) 3.1.1.3.
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Appendix A: RF Troubleshooting Nokia Customer Care help go to the next step. 3.1.1.3.2.3 Replace Vinku (N7501) 3.1.1.3.3 Replace PA (N7502) 3.1.1.4 Are control voltages VC1, VC2 and VC3 coming correctly to the antenna switch (Z7503)? • Use “RF Controls” window in Phoenix test software to activate the GSM transmitter and to select the wanted GSM band. Procedure is explained in section “Transmitter troubleshooting”.
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Nokia Customer Care Appendix A: RF Troubleshooting - Maximum power level – Output level should be about -15…-25 dBm - Minimum power level – Output level should be about -45…-55 dBm • GSM1800/GSM1900: - 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.
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Appendix A: RF Troubleshooting Nokia Customer Care • Connect the probe to R7503. • VREFRF01 voltage should be 1.325 – 1.375 V. Typical value is 1.35 V. 3.1.2.1.2.1.1.1 Desolder R7503. Is VREFRF01 voltage still wrong? • Remember to solder a new component to R7503 pads after the measurement. 3.1.2.1.2.1.1.1.
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Nokia Customer Care Appendix A: RF Troubleshooting (D2800) is faulty. Notice that it is not possible to replace RAP3G ASIC. 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 “Transmitter troubleshooting”. • Set TX power level first to the maximum (“5” in EGSM900 and “0” in GSM1800/GSM1900) • Measurement can be done with an oscilloscope and a probe.
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Appendix A: RF Troubleshooting • Nokia Customer Care 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. 3.1.2.1.5.2 Replace Vinku (N7501) 3.1.2.1.
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Nokia Customer Care • Appendix A: RF Troubleshooting Check if the frequency of the TX VCO is as expected. If the VCO signal is not found try to use wider span setting. The output level of the VCO should be about -25 dBm during GSM TX burst. 3.1.2.1.7.1.1 Replace TX VCO G7502 3.1.2.1.7.2 Replace balun T7503 3.1.2.1.8 Replace Vinku (N7501) or GSM PA (N7502) • If the output level of Vinku is higher than wanted then replace GSM PA (N7502). Otherwise replace TX ASIC Vinku (N7501). 3.1.2.
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Appendix A: RF Troubleshooting Nokia Customer Care 3.1.2.2.2.1 Matching components ok? GSM1800/GSM1900: C7575 and C7577 • Check that components are in place and solder joints are ok • GSM1800 and GSM1900: 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. 3.1.2.2.
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Nokia Customer Care Appendix A: RF Troubleshooting 3.1.2.3.1 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. 3.1.2.3.1.1 PA operating voltage VBAT_PA ok? • 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. 3.1.2.3.1.1.
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Appendix A: RF Troubleshooting Nokia Customer Care both currents. • GSM1800 or GSM1900: - Connect the probe to C7561 or C7556. - Typical full TX power bias currents (Icont_31 and Icont_32) should look somehow similar to figure 6.5.5 “Icont_31/Icont_32 (DC Offset 1.2 V)” when measured with an oscilloscope and a probe. Check both currents. 3.1.2.3.2.1 Vinku (N7501) RB_EXT voltage ok? • See section "Vinku (N7501) RB_EXT voltage ok?" 3.1.2.3.2.
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Nokia Customer Care Appendix A: RF Troubleshooting 3.1.2.4.1 Replace Hinku (N7500) 3.1.2.5 Replace antenna Switch Z7503 3.1.2.6 Replace antenna switch Z7503 3.1.3 GSM transmitter frequency correct? • Connect a spectrum analyser to the module test jig’s RF connector. • Set GSM Tx ON. Procedure is explained in section “Transmitter 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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Appendix A: RF Troubleshooting Nokia Customer Care 3.1.3.1.1 C7543, C7548 and L7517 ok? • These components should be checked if TX VCO frequency is not stable and TX PLL frequency not locked. • 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 inductor is conducting DC. 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.
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Nokia Customer Care Appendix A: RF Troubleshooting explained in section “Transmitter 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 section “Frequency mappings”). • 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).
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Appendix A: RF Troubleshooting Nokia Customer Care • 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 section “Frequency mappings”). • 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).
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Nokia Customer Care Appendix A: RF Troubleshooting • 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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Appendix A: RF Troubleshooting Nokia Customer Care Signal level in both I and Q lines should be about -93 dBm • Increase signal generator RF level to -60 dBm. Phoenix ”RSSI Reading” tool should show now quite exact RSSI level -60 dBm. Test also Q and I branches separately. Signal level in both I and Q lines should be about -63 dBm • If RSSI-levels are not as expected separate the phone into parts and place to the module jig.
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Nokia Customer Care Appendix A: RF Troubleshooting 3.2.1.1 Is Z7503 (antenna switch) working correctly? • GSM receiver has to be active before measurements. Procedure is explained in section “GSM RX chain activation for manual measurements”. • Connect an RF-generator to the GSM-antenna connector • Set RF-generator frequency as following: - EGSM900: 942.46771 MHz (Channel 37) - GSM1800: 1842.86771 MHz (Channel 700) - GSM1900: 1960.
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Appendix A: RF Troubleshooting Nokia Customer Care 3.2.1.1.1.1 Replace Hinku (N7500) 3.2.1.1.2 Replace antenna switch Z7503 3.2.1.2 Are matching components in place and working correctly? EGSM900: C7512, C7514 and L7504 GSM1800: C7581, C7584 and L7505 GSM1900: C7523, C7525 and L7506 • Check that components are in place and solder joints are ok • Use an ohmmeter to check that inductors are conducting DC. • Replace matching components 3.2.
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Nokia Customer Care Appendix A: RF Troubleshooting signals should be about the same and RX IQ-signal frequency should be 67.71 kHz (lower detail figure). The phase shift between I- and Q-signals should be 90 degrees. 3.2.2.1 RF operating voltage VBAT_ASIC ok? • See section “RF operating voltage VBAT_ASIC ok?” 3.2.2.2 RFBUS signals ok? • GSM receiver has to be active before RFBUS signals can be measured. Procedure is explained in section “GSM RX chain activation for manual measurements”.
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Appendix A: RF Troubleshooting Nokia Customer Care • 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. 3.2.2.3.1.1 VREFRF01-voltage ok? • Measurement can be done with an oscilloscope and a probe. • Connect the probe to R7503. • VREFRF01 voltage should be 1.325 – 1.375 V. Typical value is 1.35 V. 3.2.2.3.1.1.1 Desolder R7503.
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Nokia Customer Care • Appendix A: RF Troubleshooting 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. 3.2.2.3.1.3.3 Replace Hinku (N7500) or Vinku (N7501) or both 3.2.2.3.1.4 Replace Hinku (N7500) 3.2.2.3.
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Appendix A: RF Troubleshooting Nokia Customer Care • Connect the probe to C7507. • VCP1 voltage should be about 4.75 V. 3.2.2.5.1 C7507 and C2222 working properly? • Check that the components are in place and solder joints are ok • Disconnect the power supply from the phone and use an ohmmeter to check that C507 and C2222 are not short-circuited. 3.2.2.5.2 Retu ok? 3.2.2.5.3 Hinku (N7500) ok? 3.2.2.
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Nokia Customer Care Appendix A: RF Troubleshooting 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. 3.2.2.6.2.1 Low pass filter components R7509 and C7533 ok? • • Check that components are in place and solder joints are ok • Disconnect the power supply from the phone and check R7509 resistance value with an ohmmeter.
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Appendix A: RF Troubleshooting Nokia Customer Care 3.2.2.7.1.1 Hinku (N7500) regulator voltage VR1 ok? • See section “Hinku (N7500) regulator voltage VR1 ok?” 3.2.2.7.1.2 Replace Hinku (N7500) 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 section “GSM RX chain activation for manual measurements”.
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Nokia Customer Care • Appendix A: RF Troubleshooting Typical RX VCO control voltage VC should look somehow similar to figure 6.5.7 (GSM mode). 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. Procedure is explained in section “GSM RX chain activation for manual measurements”.
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Appendix A: RF Troubleshooting Nokia Customer Care not short-circuited. If short-circuit is found replace capacitors mentioned above. If this does not help go to the next step. 3.2.2.9.1.2.1.1.2 Replace Vinku (N7501) or Hinku (N7500) or both 3.2.2.9.1.2.1.2 Retu ok? 3.2.2.9.1.2.2 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 R521 and R504 resistance values with an ohmmeter. 3.2.2.9.1.
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Nokia Customer Care Appendix A: RF Troubleshooting both output lines. If the signal level is correct in the input (about -20…-30 dBm) but output level is not as expected then replace T7501. 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.
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Appendix A: RF Troubleshooting Nokia Customer Care 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 38.4 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)". 3.2.2.11.
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Nokia Customer Care Appendix A: RF Troubleshooting ohmmeter. • Use an ohmmeter to find out also if the AFC-line is short-circuited to the ground. If short-circuit is found replace C7533. If this does not help then go to the next steps. 3.2.2.11.2.2 VCTCXO ok? • Remove R7509. If AFC-voltage is correct after removing then replace faulty VCTCXO G7501 and solder R7509 (new component) back to the PWB 3.2.2.11.2.3 Replace Retu 3.2.2.11.3 Replace VCTCXO G7501 3.2.2.12 Replace Hinku ASIC (N7500) 3.2.
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Appendix A: 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. 3.2.3.1.1.1.2 Replace Vinku (N7501) or Hinku (N7500) or both 3.2.3.1.1.2 Retu ok? 3.2.3.1.
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Nokia Customer Care Appendix A: RF Troubleshooting Trigger to TX burst midamble should be used. • Attach the phone to the product specific test jig and the RF-measurement device to the RF-coupler. Coupler attenuation should be also taken into account during measurements. • The RMS Phase error shall not be greater than 5° and the peak phase error not greater than 20°.
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Appendix A: RF Troubleshooting Nokia Customer Care frequency should be set according the used TX channel (see section “Frequency mappings”). • 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.
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Nokia Customer Care Appendix A: RF Troubleshooting 3.3.5.3 Replace VCTCXO G7501 3.4 GSM (GMSK) modulation spectrum ok? • GSM transmitter has to be active before measurements. Procedure is explained in section “Transmitter troubleshooting”. • Measurement can be done with a GSM transmitter tester or other GSM communication tester. Settings have to be done according to the 3GPP specifications.
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Appendix A: RF Troubleshooting Nokia Customer Care connector). 3.4.1 Are components in GSM power control loop in place and working ok? R7516 and C7559 • Disconnect the power supply from the phone and use an ohmmeter to check that C7559 is not short-circuited. If short-circuit is found replace the capacitor. Check R7516 resistance value with an ohmmeter and replace resistor if needed. 3.4.
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Nokia Customer Care Appendix A: RF Troubleshooting not short-circuited. If short-circuit is found replace capacitors mentioned above. If this does not help go to the next step. 3.4.2.3 Replace Vinku (N7501) 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 2.3 “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.
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Appendix A: RF Troubleshooting Nokia Customer Care 3.4.4.2 Replace balun T7503 3.4.5 Replace Vinku (N7501) or GSM PA (N7502) or both 3.5 TX power vs. time ok? This section 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 section “Transmitter troubleshooting”.
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Nokia Customer Care Appendix A: RF Troubleshooting • 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 C7549 is not short-circuited. 3.5.1.3 Retu ok? 3.5.2 Does GSM PA (N7502) get correct bias currents? Is the level of bias currents ok? EGSM: Icont_21 and Icont_22 GSM1800/GSM1900: Icont_31 and Icont_32 • GSM transmitter has to be active before measurements.
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Appendix A: RF Troubleshooting Nokia Customer Care 3.5.2.3 Replace Vinku (N7501) 3.5.3 Does GSM PA (N7502) get correct DET_SW_G -voltage from Vinku ASIC (N7501)? • GSM transmitter has to be active before DET_SW_G voltage can be measured. Procedure is explained in section “Transmitter troubleshooting”. • Measurement can be done with an oscilloscope and a probe. • Connect the probe to C7595.
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Nokia Customer Care Appendix A: RF Troubleshooting 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 and a spectrum analyser to the RF-coupler. Coupler attenuation should be also taken into account during measurements. This measurement should be done in an RF shielded box. • Close the shield box hatch.
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Appendix A: RF Troubleshooting Nokia Customer Care • Spectrum analyser RBW = VBW = 10 MHz, Span ≤ 2 MHz, sweep time 100 ms. • Connect the RF probe to R7520. The RF-level should be about the same on both ends of the resistor. Check output level with 0 dBm power level (Set start level “0” to Phoenix). - Power level “0” – Output level should be about -40…-48 dBm 4.1.1.1.1 RF operating voltage VBAT_ASIC ok? • See section “RF operating voltage VBAT_ASIC ok?” 4.1.1.1.
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Nokia Customer Care Appendix A: RF Troubleshooting 4.1.1.1.3.1 Vinku (N7501) RB_EXT voltage ok? • WCDMA transmitter has to be active before Vinku’s RB_EXT voltage can be measured. Procedure is explained in section “Transmitter troubleshooting”. • Measurement can be done with an oscilloscope and a probe. • Connect the probe to R7521. • RB_EXT voltage should be 1.325 – 1.375 V. 4.1.1.1.3.1.1 VREFRF01-voltage ok? • Measurement can be done with an oscilloscope and a probe.
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Appendix A: RF Troubleshooting • Nokia Customer Care Disconnect the power supply from the phone and check R7503 resistance value with an ohmmeter 4.1.1.1.3.1.3.2 Capacitors C7518, C7520 and C7570 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 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. 4.1.1.1.
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Nokia Customer Care Appendix A: RF Troubleshooting 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 “Transmitter troubleshooting”. • Measurement can be done with an oscilloscope and a probe. • Connect the probe to C2221 (or C7550). • VCP2 voltage should be about 4.75 V. 4.1.1.1.5.
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Appendix A: RF Troubleshooting Nokia Customer Care explained in section “Transmitter 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 section “Frequency mappings”). RBW and VBW = 1 MHz, Span ≤ 200 kHz. • Check the level of the TX VCO frequency in T7503 outputs. The level should be about -30…-35 dBm in both output lines.
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Nokia Customer Care Appendix A: RF Troubleshooting • WCDMA transmitter has to be active before measurements. Procedure is explained in section “Transmitter 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. 4.1.1.1.10.
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Appendix A: RF Troubleshooting • Nokia Customer Care 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. 4.1.1.1.11.2.1 Low pass filter components R7509 and C7533 ok? • Check that components are in place and solder joints are ok • Disconnect the power supply from the phone and check R7509 resistance value with an ohmmeter.
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Nokia Customer Care Appendix A: RF Troubleshooting 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 4.1.1.2.1.1 Inductor L7511 and resistor R7520 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 R7520 resistance value with an ohmmeter. • If resistance of R7520 is correct then replace L7511. 4.1.1.
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Appendix A: RF Troubleshooting • Nokia Customer Care Voltage level should be 3.05 – 5.4 V. Typical value is 4.0 V. 4.1.1.3.1.2.1 Ferrite Z7500 ok? • Check that component is in place and solder joints are ok • Disconnect the power supply from the phone and use an ohmmeter to check that inductor is conducting DC. 4.1.1.3.2 Does WCDMA PA (N7503) get operating voltage Vcc11? • WCDMA transmitter has to be active before measurements. Procedure is explained in section “Transmitter troubleshooting”.
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Nokia Customer Care • Appendix A: RF Troubleshooting Voltage level should be about 2.78 V. 4.1.1.3.2.3.1 Replace Vinku (N7501) 4.1.1.3.2.4 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 section “Transmitter troubleshooting”. • Measurement can be done with an oscilloscope and a probe. • Connect the probe to C7591. • Vcontrol signal should be constant DC-voltage.
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Appendix A: RF Troubleshooting Nokia Customer Care - 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. 4.1.1.3.3.
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Nokia Customer Care Appendix A: RF Troubleshooting • 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. 4.1.1.3.3.1.3.1 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 4.1.1.3.3.1.3.
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Appendix A: RF Troubleshooting Nokia Customer Care 4.1.1.4.1 Replace isolator Z7505 4.1.1.5 Replace duplex-filter Z7502 4.1.2 Does WCDMA TX transmit enough RF-power and power levels otherwise ok? 4.1.2.1 Is Vinku ASIC (N7501) transmitting correct RF-power? • WCDMA transmitter has to be active before Vinku’s output level can be measured. Procedure is explained in section “Transmitter troubleshooting”. • Measurements can be done with a spectrum analyser and an RF probe.
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Nokia Customer Care • Appendix A: RF Troubleshooting VREFRF01 voltage should be 1.325 – 1.375 V. Typical value is 1.35 V. 4.1.2.1.2.1.1.1 Desolder R7503. Is VREFRF01 voltage still wrong? • Remember to solder a new component to R7503 pads after measurement. 4.1.2.1.2.1.1.1.1 Capacitors C7518, C7520 and C7570 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 check that capacitors are not short-circuited.
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Appendix A: RF Troubleshooting Nokia Customer Care is no fail in 2.3 “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. 4.1.2.1.4 Is the TXC-signal coming to Vinku ASIC (N7501) OK? Is signal level correct? • WCDMA transmitter has to be active before TX control voltage TXC can be measured. Procedure is explained in section “Transmitter troubleshooting”.
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Nokia Customer Care Appendix A: RF Troubleshooting 4.1.2.1.6 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 section “Transmitter 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 section “Frequency mappings”). RBW and VBW = 1 MHz, Span ≤ 200 kHz.
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Appendix A: RF Troubleshooting Nokia Customer Care “Transmitter 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. Spectrum analyser centre frequency should be set according the used TX channel (see section “Frequency mappings”). • Spectrum analyser RBW = VBW = 10 MHz, Span ≤ 2 MHz, sweep time 100 ms. • Connect the RF probe to L7511. The RF-level should be about the same on both ends of the inductor.
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Nokia Customer Care Appendix A: RF Troubleshooting 4.1.2.3.1.2 PA operating voltage VBAT_PA ok? • WCDMA transmitter has to be active before measurements. Procedure is explained in section “Transmitter 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. 4.1.2.3.1.2.
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Appendix A: RF Troubleshooting Nokia Customer Care 4.1.2.3.2.3 Is there correct DET_SW_W –voltage coming from Vinku ASIC (N7501)? • Measurement can be done with an oscilloscope and a probe. • Connect the probe to C7586. • Voltage level should be about 2.78 V. 4.1.2.3.2.3.1 Replace Vinku (N7501) 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.
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Nokia Customer Care Appendix A: RF Troubleshooting • WCDMA transmitter has to be active before measurements. Procedure is explained in section “Transmitter 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 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.
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Appendix A: RF Troubleshooting Nokia Customer Care 4.1.2.3.3.1.2 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. 4.1.2.3.3.1.3 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. 4.1.2.3.3.1.3.
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Nokia Customer Care Appendix A: RF Troubleshooting according the used TX channel (see section “Frequency mappings”) • Spectrum analyser RBW = VBW = 10 MHz, Span ≤ 2 MHz, sweep time 100 ms • Connect the probe to Z7502 TX input. The RF level should be roughly -20…-30 dBm. 4.1.2.4.1 Replace isolator Z7505 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.
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Appendix A: 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 section “Transmitter 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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Nokia Customer Care Appendix A: RF Troubleshooting 4.1.3.1.2.2.1.1 Desolder R7503. Is VREFRF01 voltage still wrong? • Remember to solder a new component to R7503 pads after measurement. 4.1.3.1.2.2.1.1.1 Capacitors C7518, C7520 and C7570 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 check that capacitors are not short-circuited. If short-circuit is found replace capacitors mentioned above.
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Appendix A: RF Troubleshooting Nokia Customer Care explained in section “Transmitter 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 section “Frequency mappings”). RBW and VBW = 1 MHz, Span ≤ 200 kHz. • Check the level of the TX VCO frequency in T7503 outputs. The level should be about -30…-35 dBm in both output lines.
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Nokia Customer Care Appendix A: RF Troubleshooting span setting. The output level of the VCO should be about -25 dBm. 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.
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Appendix A: RF Troubleshooting Nokia Customer Care • Disconnect the power supply from the phone and check R7509 resistance value with an ohmmeter. • Use an ohmmeter to find out also if the AFC-line is short-circuited to the ground. If short-circuit is found replace C7533. If this does not help then go to the next steps. 4.1.3.3.2.2 VCTCXO ok? • Remove R7509. If AFC-voltage is correct after removing then replace faulty VCTCXO G7501 and solder R7509 (new component) back to the PWB 4.1.3.3.2.
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Nokia Customer Care Appendix A: RF Troubleshooting frequency settings to the spectrum analyser (Centre frequency should be set to the same frequency as the RF-generator). RBW = VBW = 10 kHz, Span = 0, sweep time = 100 ms. • Connect the probe to T7500 output. There are two output pins because of balanced output. The RF level should be roughly -85…-90 dBm in both output pads when input signal level in WCDMA antenna connector is -50 dBm. 4.2.1.
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Appendix A: RF Troubleshooting Nokia Customer Care • Measurements can be done with a spectrum analyser and an RF probe. Remember to make correct frequency settings to the spectrum analyser (Centre frequency should be set to the same frequency as the RF-generator). RBW = VBW = 10 kHz, Span = 0, sweep time = 100 ms. • Connect the probe to the Z7501 output. The RF level should be roughly -70…-75 dBm in both output pads when input signal level in WCDMA antenna connector is -50 dBm. 4.2.3.
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Nokia Customer Care Appendix A: RF Troubleshooting (GSM RX)” and “RBUSCLK and RFBUSENA (GSM RX)”. - RFBUSENA: Connect the probe to J7506. Typical RFBUSENA -signal is shown in the figure “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. The level of this signal should be about 0 V before transceiver activation.
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Appendix A: 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. 4.2.4.3.1.1.1.2 Replace Vinku (N7501) or Hinku (N7500) or both 4.2.4.3.1.1.2 Retu ok? 4.2.4.3.1.
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Nokia Customer Care Appendix A: RF Troubleshooting 4.2.4.3.4 Replace Hinku (N7500) 4.2.4.4 VXO-voltage ok? (=Vdig). • Measurement can be done with an oscilloscope and a probe • Connect the probe to C7560 (or C7526, C7513) Notice: C7526 is a non-assembled component so the probe should be connected to the pad that can still be found from the PWB. • VXO-voltage should be about 2.5 V 4.2.4.4.
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Appendix A: RF Troubleshooting Nokia Customer Care • 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 section “Frequency mappings”. RBW and VBW = 1 MHz, Span ≤ 200 kHz. • Connect the RF probe to the T7501 input. • Check if the frequency of the RX VCO is as expected. If the VCO signal is not found try to use wider span setting. The output level of the VCO should be about -20…-30 dBm. 4.2.4.6.
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Nokia Customer Care • Appendix A: RF Troubleshooting Check if the frequency of the RX VCO is as expected. If the VCO signal is not found try to use wider span setting. The output level of the VCO should be about -20…-30 dBm. 4.2.4.8.1 RX VCO control voltage VC ok? • WCDMA receiver has to be active before RX VCO control voltage VC can be measured. Procedure is explained in section “Receiver troubleshooting”. • Measurement can be done with an oscilloscope and a probe. • Connect the probe to R7501.
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Appendix A: RF Troubleshooting Nokia Customer Care 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 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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Nokia Customer Care • Appendix A: RF Troubleshooting 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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Appendix A: RF Troubleshooting Nokia Customer Care 4.2.4.11.2.3 Replace Retu 4.2.4.11.3 Replace VCTCXO G7501 4.2.5 Does RAP3G ASIC get ok VREFCM-signal from Hinku (N7500)? Signal level ok? • Measurement can be done with an oscilloscope and a probe. • Connect the probe to J7516. • VREFCM voltage should be about 780 mV (continuous voltage). 4.2.5.1 Hinku (N7500) RB_EXT voltage ok? • See section "Hinku (N7501) RB_EXT voltage ok?" 4.2.5.
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Nokia Customer Care Appendix A: RF Troubleshooting dBm). NOTE: Perform WCDMA transmitter tests with > 0 dBm power only in RF shielded environment. 4.3.1.1 L7515, C7589 and C7580 in place and 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 check that L7515 is conducting DC. • Use an ohmmeter also to check that capacitors are not short-circuited.
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Appendix A: RF Troubleshooting Nokia Customer Care 4.3.1.4.1 Is there correct DET_SW_W –voltage coming from Vinku ASIC (N7501)? • Measurement can be done with an oscilloscope and a probe. • Connect the probe to C7586. • Voltage level should be about 2.78 V. 4.3.1.4.1.1 Replace Vinku (N7501) 4.3.1.4.2 Check WCDMA power detector components – In place and value correct? Components L7514, C7585, V7500, R7526, C7586, R7527, C7587, C7590, R7529, R7530, C7591, R7531 and C7592.
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Nokia Customer Care • Appendix A: RF Troubleshooting RB_EXT voltage should be 1.325 – 1.375 V. 4.3.2.1.1 VREFRF01-voltage ok? • Measurement can be done with an oscilloscope and a probe. • Connect the probe to R7503. • VREFRF01 voltage should be 1.325 – 1.375 V. Typical value is 1.35 V. 4.3.2.1.1.1 Desolder R7503. Is VREFRF01 voltage still wrong? • Remember to solder a new component to R7503 pads after measurement. 4.3.2.1.1.1.
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Appendix A: RF Troubleshooting Nokia Customer Care help go to the next step. 4.3.2.1.3.3 Replace Vinku (N7501) or Hinku (N7500) or both 4.3.2.1.4 Replace Vinku (N7501) 4.3.2.2 Is capacitor C7579 in WCDMA PA (N7503) bias line working correctly? Icont_12 missing – C7579 short-circuited? • Check that component is in place and solder joints are ok • Disconnect the power supply from the phone and use an ohmmeter to check that the capacitor is not short-circuited.
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Nokia Customer Care Appendix A: RF Troubleshooting 4.3.4.1.1 Replace TX VCO G7502 4.3.4.2 Replace balun T7503 4.3.5 Replace Vinku (N7501) or WCDMA PA (N7503) or both A-114 Company Confidential Copyright © 2005 Nokia.
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Appendix A: RF Troubleshooting Nokia Customer Care 5. DOES THE PHONE HAVE A RELIABLE CONNECTION TO THE NETWORK (GSM)? This section refers to a situation when the phone registers to the GSM-network and is capable to make a call, but the call is not reliable even if the GSM-network field strength is strong. The phone call is maybe disconnected or interrupted. 5.
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Nokia Customer Care Appendix A: RF Troubleshooting 6.1 WCDMA receiver Bit Error Rate (BER) ok? • This test needs a WCDMA communication tester and if there is no that kind of tester available continue troubleshooting in section 4.2 “Does the phone give realistic RSSI-values?”. • Attach the phone to the product specific test jig and a GSM communication tester to the RF-coupler. Coupler attenuation should be also taken into account during measurements.
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Appendix A: RF Troubleshooting Nokia Customer Care 6.3.1 Is capacitor C7579 in WCDMA PA (N7503) bias line in place? • Check that the component is in place and solder joints are ok 6.3.2 Are capacitors in Vinku REG1 and REG2 lines in place? C7554, C7555 and C7547 • Check that components are in place and solder joints are ok 6.3.3 Are capacitors in WCDMA PA power supply lines in place? C7569 and C7583 • Check that components are in place and solder joints are ok 6.3.
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Nokia Customer Care Appendix A: RF Troubleshooting 6.3.5.2 Replace balun T7503 6.3.6 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 1.24 V)". 6.3.6.1 VXO-voltage ok? (=Vdig).
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Appendix A: 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) Company Confidential Copyright © 2005 Nokia.
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Nokia Customer Care Appendix A: RF Troubleshooting 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) A-120 Company Confidential Copyright © 2005 Nokia.
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Nokia Customer Care Appendix A: RF Troubleshooting 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). A-122 Company Confidential Copyright © 2005 Nokia.
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Appendix A: 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. Company Confidential Copyright © 2005 Nokia.
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Nokia Customer Care Appendix A: RF Troubleshooting 6.5.8 TX Modulation spectrum (GSM) Example of the TX modulation spectrum (GMSK) in EGSM900 band. A-124 Company Confidential Copyright © 2005 Nokia.
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Appendix A: 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). Company Confidential Copyright © 2005 Nokia.
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Appendix A: 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). Company Confidential Copyright © 2005 Nokia.