User Guide

ManualsBrandsNokia ManualsCell PhoneE62

7 — RF Troubleshooting and

Manual Tuning Guide

Nokia Customer Care

Issue 1 COMPANY CONFIDENTIAL Page 7 –1

Summary of content (36 pages)

PAGE 3
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Table of Contents Introduction to RF troubleshooting.....................................................................................................................7–5 RF key component placement...............................................................................................................................7–5 Receiver troubleshooting.......................................................................................
PAGE 5
RM-88 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) The RF section of the phone is around RF ASIC N7505, TX FEM N7520, and all of this RF section is built inside of non-removable shields A7506, A7507.
PAGE 8
Nokia Customer Care RM-88 RF Troubleshooting and Manual Tuning Guide Figure 44 RM-88 component placement (top) Figure 45 RM-88 component placement (bottom) Page 7 –8 COMPANY CONFIDENTIAL Copyright © 2006 Nokia. All rights reserved.
PAGE 9
RM-88 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. In GSM, the input signal can be either a real GSM signal or a CW (Continuous Wave) signal, which is 67.
PAGE 10
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care • Set Rx/Tx channel to 190 on GSM850, 37 on GSM900 band or 700 on GSM1800 band or 661 on GSM1900 (Defaults). • Set Edge to “Off” (Default). (Not active in RXmode). • Set Tx PA mode to “Free” (Default). (Not active in RXmode). • Apply 942.46771 MHz (channel 37 + 67.710 kHz offset), 881.66771MHz (channel 190 + 67.710 kHz), 1842.86771 MHz (channel 700 + 67.710 kHz offset) or 1960.06771 MHz (channel 661 + 67.
PAGE 11
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 4. In the RSSI Reading window, select the appropriate band and channel. Figure 47 RSSI Reading window 5. To start the measurement, activate GSM Rx chain, click Start. Results RSSI reading values of the selected band and channel are displayed. The RSSI level must be the same value which is set at the signal generator (-90 dBm). If RSSI reading is far away from -90dBm, try to do RX tuning.
PAGE 12
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 2. Connect a DC power supply to a module jig (MJ-67). 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 12V and set the jumper connector on the test jig's reg.pass switch to “ON” position. 3.
PAGE 14
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care TX 850/900 troubleshooting Troubleshooting flow Page 7 –14 COMPANY CONFIDENTIAL Copyright © 2006 Nokia. All rights reserved.
PAGE 15
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care TX 1800/1900 troubleshooting Troubleshooting flow Checking antenna functionality The main antenna has one antenna: GSM . In the GSM antenna, there is one Feed and two GND contacts. Issue 1 COMPANY CONFIDENTIAL Copyright © 2006 Nokia. All rights reserved.
PAGE 16
Nokia Customer Care RM-88 RF Troubleshooting and Manual Tuning Guide The contacts of the GSM antenna are separated in the (RDC = 0 ohm) short-circuit. Figure 49 Main antenna Figure 50 Feed and GND spots of the main antenna Page 7 –16 COMPANY CONFIDENTIAL Copyright © 2006 Nokia. All rights reserved.
PAGE 17
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 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 one GND contact. The antenna is functioning normally when the contacts function (RDC = 0 ohm) and the antenna is visually intact.
PAGE 18
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 2. Start Phoenix service software. 3. From the Tools menu, choose Options -> GPIB Card. 4. In the Card Type line, select CEC8Bit, then click Start. 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. 6. Click the Cable tab and add the extra cable attenuation.
PAGE 19
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 7. To start autotuning, choose Auto-Tune from the Tuning menu. 8. In the Auto-Tune window, click Options. 9. In the Auto-Tune options window, see that the "Enable showing of messages" check box is checked, then click OK. 10. To complete the RF autotuning, click OK. Results "Autotuning completed successfully" message appears. Issue 1 COMPANY CONFIDENTIAL Copyright © 2006 Nokia. All rights reserved.
PAGE 20
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care System mode independent manual tunings Rf channel filter calibration Context Rf channel filter calibration tunes the internal low pass filters of Rx and Tx ASICs that limit the bandwidth of BB IQ signals. One common calibration is made for GSM. Table 12 Rf channel filter calibration tuning limits Min Typ Max Tx filter 0 10 31 Rx filter 0 16 31 Steps 1. From the Operating mode drop-down menu, set mode to Local. 2.
PAGE 21
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care PA (power amplifier) detection Context The PA detection procedure detects which PA manufacturer is used for phone PAs. If a PA is changed or if the permanent memory (PMM) data is corrupted, PA detection has to be performed before Tx tunings. Steps 1. From the Operating mode drop-down menu, set mode to Local. 2. Choose Tuning→PA Detection . 3. Click Tune. 4.
PAGE 23
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 8. Click Calibrate. 9. Connect the signal generator to the phone, and set frequency and amplitude as instructed in the Rx Calibration with band EGSM900 pop-up window. Important: 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 © 2006 Nokia. All rights reserved.
PAGE 24
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 10. To perform the tuning, click OK. 11. Check that the tuning values are within the limits specified in the following table: Table 13 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 AFC Value -200 -105...62 200 AFC slope 0 122 200 106 107...110 114 dB 104 104...109 114 dB 104 104...
PAGE 25
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 12. To save values to the phone, check the Save to Phone check box, and click Stop. Next actions Repeat steps 3 to 8 for GSM850, GSM1800 and GSM1900 Rx band filter response compensation (GSM) Prerequisites 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 RF ASIC front end.
PAGE 26
Nokia Customer Care RM-88 RF Troubleshooting and Manual Tuning Guide 3. From the Tuning menu, choose GSM -> Rx Band Filter Response Compensation. 4. Check “Manual” and “Load from Phone” check boxes. Clear “Save to Phone” check box 5. Click Start. Page 7 –26 COMPANY CONFIDENTIAL Copyright © 2006 Nokia. All rights reserved.
PAGE 27
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 6. Click Tune. 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. Issue 1 COMPANY CONFIDENTIAL Copyright © 2006 Nokia. All rights reserved.
PAGE 28
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 10. Check that the tuning values are within the limits specified in this table: Min Typ Max Unit Ch. 118 / 867.26771 MHz -10 -1 5 dB Ch. 128 / 869.26771 MHz -3 0 5 dB Ch. 140 / 871.66771 MHz -3 0 5 dB Ch. 172 / 878.06771 MHz -3 0 5 dB Ch. 190 / 881.66771 MHz -3 0 5 dB Ch. 217 / 887.06771 MHz -3 0 5 dB Ch. 241 / 891.86771 MHz -3 0 5 dB Ch. 251 / 893.86771 MHz -3 0 5 dB Ch. 261/ 895.
PAGE 29
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Min Typ Max Unit 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 / 1884.46771 MHz -10 -1 5 dB Ch. 496 / 1927.06771 MHz -10 -1 5 dB Ch.
PAGE 30
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 11. Check the "Save to Phone" check box and click Stop if the values are within the limits. Next actions Repeat the steps 4 to 10 for GSM850, GSM1800 and GSM1900. 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.
PAGE 31
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 5. When the values have been written to the phone memory, click the Finish button to end the tuning. 6. Change band to GSM850 and repeat steps 4 to 5. 7. Change band to GSM1800 and repeat steps 4 to 5. 8. Change band to GSM1900 and repeat steps 4 to 5. 9. To close the tuning window, click Close. Next actions Tuning sliders should be close to the center of the scale after the tuning and within the limits specified in the table below.
PAGE 32
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care Min Typ Max Unit I DC offset / Q DC offset -6 -4 6 % Ampl -1 0 1 dB Phase 85 90 95 ○ I/Q DC -6 0.5 6 % Ampl -1 0 1 dB Phase 95 100 110 ○ GSM1800/GSM1900 Tx power level tuning (GSM) Context Because of variations at IC process and discrete component values, actual transmitter RF gain of each phone is different. Tx power level tuning is used to find out mapping factors called 'power coefficients’.
PAGE 33
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 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! 6. Click Start. 7. Adjust power levels 5, 15 and 19 to correspond the "Target dBm" column by pressing + or – keys. Issue 1 COMPANY CONFIDENTIAL Copyright © 2006 Nokia. All rights reserved.
PAGE 34
RM-88 RF Troubleshooting and Manual Tuning Guide Nokia Customer Care 8. Click Calculate Coefficients. 9. Check that the coeffiecient values are within the limits specified in the following table. Min Typ Max 0.45 0.626 0.73 GSM850 EDGE off PL5 coefficient PL15 coefficient PL19 coefficient 0.234 0.12 0.195 0.3 0.35 0.419 0.6 GSM850 EDGE on PL8 coefficient PL15 coefficient PL19 coefficient 0.247 0.12 0.204 0.3 0.45 0.626 0.
PAGE 35
RM-88 RF Troubleshooting and Manual Tuning Guide Min PL11 coefficient PL15 coefficient Nokia Customer Care Typ Max 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 0.7 GSM1900 EDGE off PL0 coefficient PL11 coefficient PL15 coefficient 0.218 0.12 0.184 0.3 0.35 0.377 0.6 GSM1900 EDGE on PL2 coefficient PL11 coefficient PL15 coefficient 0.23 0.12 0.193 0.
PAGE 36
RM-88 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.