Nokia RH-29 Series Manual

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Nokia Customer Care

RH-29 Series Cellular Phones

6b - RF Troubleshooting

Issue 1 05/2004

Page 1

Company Confidential

Table of Contents

Troubleshooting

Summary of Contents for Nokia RH-29 Series

Page 3: Table Of Contents
RX calibration (incl. VCXO Calibration) ..................42 EGSM900 and DCS1800 ....................... 43 RX AGC limits ............................47 RX band filter response compensation ..................47 EGSM900............................47 DCS1800............................50 TX I/Q tuning ............................51 EGSM900............................51 Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 1 Company Confidential...
Page 4 RH-29 Company Confidential 6b - RF Troubleshooting Nokia Customer Care DCS1800............................56 TX power tuning ..........................62 Copyright © 2004 Nokia Corporation Page 2 Issue 1 05/2004 Company Confidential...
Page 5: Rf Troubleshooting
Local Oscillator Loop Filter Power Amplifier Digital Cellular System Phase Locked Loop Printed Wired Board RH-29 Project Type Designator Radio Frequency Receiver Spectrum analyzer Transmitter Universal Energy Management Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 1 Company Confidential...
Page 6 RH-29 Company Confidential 6b - RF Troubleshooting Nokia Customer Care Ultra High Frequency Universal Phone Processor Voltage-controlled oscillator VCXO Voltage-controlled Crystal Oscillator Very High Frequency Copyright © 2004 Nokia Corporation Page 2 Issue 1 05/2004 Company Confidential...
Page 7: Introduction
PWB. Capacitors can be checked for short-circuiting and resistors for value by means of an ohm-meter, but be aware in-circuit measurements should be evaluated carefully. Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 3 Company Confidential...
Page 8: Rf Key Component Placement
900 RX SAW filter L801 Directional Coupler Z701 900 TX SAW filter V801 Detector Diode T701 GSM1800 TX Balun Z601 Antenna switch V802 900 TX buffer N801 Power Amplifier Copyright © 2004 Nokia Corporation Page 4 Issue 1 05/2004 Company Confidential...
Page 9: Rf Measurement Points
RF power supplies are generated in the UEM and can be measured either in the Mjoelner can or in the baseband can. Arrows mark the measurement points inside the pictures. Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 5...
Page 10: Measurement Points In The Receiver
Figure 4: Rx measurement points at Rx SAW filters and Mjoelner RF ASIC DCS1800 SAW Z602 Output/Mjoelner DCS RX Input SAW Input GSM900 SAW Z604 Output/Mjoelner GSM RX Input SAW Input Copyright © 2004 Nokia Corporation Page 6 Issue 1 05/2004 Company Confidential...
Page 11: Measurement Points In The Transmitter
Figure 5: Tx measurement points inside PA can V802 900 Pre- N801 Triple Band PA V801 Power Detector L801 Coupler C815 Z601 Antenna Vbat Supply capacitor Switch C819 Vbat Supply capacitor L809 Vbat Supply inductor Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 7 Company Confidential...
Page 12 RH-29 Company Confidential 6b - RF Troubleshooting Nokia Customer Care Figure 6: Tx measurement points for TXC, TXP signals Copyright © 2004 Nokia Corporation Page 8 Issue 1 05/2004 Company Confidential...
Page 13: Receiver
Scan Product Ctrl-R Wait until phone information shows in the window at the bottom of the screen. Phone information Product Information Software version Set operating mode to local mode Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 9 Company Confidential...
Page 14 EGSM900: 942.467 MHz (channel 37 + 67.710kHz offset) GSM1800: 1842.867 MHz (channel 700 +67.710kHz offset) and a power level of -80dBm to the RF-connector (remember to compensate for cable attenuation). In RSSI reading click Start. Copyright © 2004 Nokia Corporation Page 10 Issue 1 05/2004 Company Confidential...
Page 15: Measuring Rx Performance Using Snr Measurement
Testing Alt-S RF Controls Wait until the RF Controls window pops up Select Band GSM 900 Active unit Burst Operation mode RX/TX Channel Select Testing Alt-S SNR Measurement Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 11 Company Confidential...
Page 16: Measuring Front End Power Levels Using Spectrum Analyzer
GSM1800 >18dB Measuring front end power levels using spectrum analyzer Spectrum Analyzer (SA) level values depend on the probe type and should be vali- dated using a good sample. Copyright © 2004 Nokia Corporation Page 12 Issue 1 05/2004 Company Confidential...
Page 17 Band GSM 900 or DSC1800 Active unit Continuous Operation mode RX/TX Channel 37 or 700 Please refer to the troubleshooting chart for proper levels at different test points. Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 13 Company Confidential...
Page 18: Receiver Troubleshooting
L701, L702 Replace Inductor L703. OK? Refer to BB UEM. Replace Fault Finding Mjoelner Receiver is working correctly. Inspect / Test With Test With Check Spectrum Analyzer Oscilloscope Action Copyright © 2004 Nokia Corporation Page 14 Issue 1 05/2004 Company Confidential...
Page 19: Gsm900 Transmitter
For easy error tracing it is important to know the signal path of the GSM900 transmitter. The components can be grouped into blocks and drawn as shown below. Note that the following picture shows both GSM900 transmitter (bottom) and GSM1800 transmitter Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 15...
Page 20 The antenna Switch works as a diplexer for the RX and TX signals. Moreover, it sup- presses the TX harmonics generated by the PA. The antenna switch is controlled by the Mjoelner RF ASIC using the control signals Vcont1 and Vcont2. The following table Copyright © 2004 Nokia Corporation Page 16 Issue 1 05/2004...
Page 21 Nokia Customer Care 6b - RF Troubleshooting shows the possible different states. Vcont1 Vcont2 900 Rx DCS Rx 900 Tx DCS Tx [Volt] [Volt] Phone information Product Information Software version Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 17 Company Confidential...
Page 23 6b - RF Troubleshooting Figure 7: TX Digital I & Q Test Points J203 TXQD J202 TXID Figure 8: TX Digital I & Q Data, J202 and J203 Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 19 Company Confidential...
Page 24 6b - RF Troubleshooting Nokia Customer Care Figure 9: Mjoelner Can Test Points TXQOUTN TXIOUTN TXIOUTP TXQOUTP Vcont1 Vcont2 TX Analog I & Q Data, C715 & C716 Copyright © 2004 Nokia Corporation Page 20 Issue 1 05/2004 Company Confidential...
Page 25 Nokia Customer Care 6b - RF Troubleshooting TXP & TXC Lines during Transmission TXP / TXC Mask Power Control Loop On Baseband Generated Reference for EGSM Power Level 19 Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 21 Company Confidential...
Page 26 DCS In DCS In GSM In Vbat Vbat VTXB_900 (EGSM V802 Pre-Amp Biasing Waveform) VTXB_900 (900 V802 Pre-Amp Biasing Waveform) Only Biases V802 for duration of TX Pulse. Copyright © 2004 Nokia Corporation Page 22 Issue 1 05/2004 Company Confidential...
Page 27 Company Confidential RH-29 Nokia Customer Care 6b - RF Troubleshooting Figure 11: 900 Tx waveform, burst, pwr level 19 Figure 12: 900 Tx waveform, continuous, pwr level 19 Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 23 Company Confidential...
Page 29: 900 Tx Troubleshooting Flowchart
C820,C821 Check L703 and L702. Antenna L702 & L703. and L813 OK? Switch Replace Inductors Test using Test using Check / Spectrum Analyzer Oscilloscope Inspect Action Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 1 Company Confidential...
Page 30: Gsm1800 Transmitter
For easy error tracking it is important to know the signal path of the GSM1800 transmit- ter. The components can be grouped into blocks and drawn as shown below. Note that the picture shows both EGSM900 transmitter (bottom) and GSM1800 transmitter (top). Copyright © 2004 Nokia Corporation Page 2 Issue 1 05/2004...
Page 31: The Path Of Mjoelner Rf Asic
The output is controlled by the power control loop. From the output of the PA the signal goes through the directional coupler (one of the power control loop components) to the Antenna Switch. Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 3...
Page 32 Vcont1 Vcont2 EGSM EGSM DCS RX DCS TX [Volt] [Volt] Figure 13: Antenna Switch Test Points Z602 input Vcont1 Z604 input DCS1800 RX EGSM900 Vcont2 Antenna Switch input Copyright © 2004 Nokia Corporation Page 4 Issue 1 05/2004 Company Confidential...
Page 33: Troubleshooting Chart For Gsm1800 Transmitter
PA is not outputting enough power so it tries to compensate by increasing the gain. When checking the Power Control loop, make sure that VBD is pulsing at 2.8V Peak to Peak. Check the DET pulse at Mjoelner input on R706. Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 5 Company Confidential...
Page 34 R802 V801 Eunsure that VBD Replace Faulty is pulsing 2.8V Components Pk - PK and investigate Mjoelner Test With Test With Check / Spectrum Oscilloscope Inspect Action Analyzer Copyright © 2004 Nokia Corporation Page 6 Issue 1 05/2004 Company Confidential...
Page 35: Rh-29 Synthesizer
Wait until the RF Controls window pops up Set the synthesizer to the following mode: Select Band GSM900 or DCS1800 Active unit Operation mode Continuous RX/TX Channel 37 or 700 Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 7 Company Confidential...
Page 36 T702 Balanced Output 0V - 4.7V Charge Pump O/p Test Point C710 If this is not the case, then go to troubleshooting chart in this document for trouble- Copyright © 2004 Nokia Corporation Page 8 Issue 1 05/2004 Company Confidential...
Page 37: 26 Mhz Reference Oscillator (Vcxo)
Therefore, a VCXO-calibration (cal) value is written via the serial Bus into the RefOSCCAL register of Mjoelner and an additional bit in the RefOSCCntl register of the Mjoelner. That is necessary for the rough calibration of the VCXO. Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 9...
Page 38: Vco
It is important to say that power supply for VCXO (VR3) is only switched ‘OFF’ in the so- called ‘Deep Sleep Mode’ and power supply for VCO (G701 VR7) is switched ‘OFF’ in so- called ‘Sleep Mode’. Copyright © 2004 Nokia Corporation Page 10 Issue 1 05/2004...
Page 39: Pll Power Supply
Company Confidential RH-29 Nokia Customer Care 6b - RF Troubleshooting PLL power supply Loop Filter VCO and power supply Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 11 Company Confidential...
Page 40: 26Mhz Bluetooth Buffer
If the RSSI levels are OK, the failure reason is bended cen- ter shield or in other part of the phone. Change the shield and try again. If it is still not functional, refer to BB troubleshooting. Copyright © 2004 Nokia Corporation Page 12 Issue 1 05/2004...
Page 41: Phoenix Tuning
2 bands. Set operating mode to local mode Select Tuning Alt-U RX Channel Select filter Calibration Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 13 Company Confidential...
Page 42: Rx Calibration (Incl. Vcxo Calibration)
3 AFC-slope coefficients. A value (RF_TEMP), which represents the RF hardware temperature, is determined during RX Calibration. This temperature value is used by DSP to RSSI reporting in Normal mode Copyright © 2004 Nokia Corporation Page 14 Issue 1 05/2004...
Page 43: Egsm900 And Dcs1800
One AFC slope value is not sufficient for Mjoelner F3, because the AFC slope is non-linear in this chip. EGSM900 and DCS1800 Select Tuning Alt-U RX Calibration Wait until the RX Calibration window pops up. Select Band GSM900 Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 15 Company Confidential...
Page 44 Connect an external signal generator to the RF connector of the phone and set the gen- erator as told in the window, taking care for external cable losses. Press OK and the window closes. Copyright © 2004 Nokia Corporation Page 16 Issue 1 05/2004...
Page 45 Let an external signal generator be connected to the RF connector of the phone and set the generator as told in the window, taking care of external cable losses. Press OK and the window closes. Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 17...
Page 46 A typical result will look like this: Press Save and Continue, and a new window pops up: Press OK and the RX Calibration of the EGSM900 and DCS1800 are finished. Copyright © 2004 Nokia Corporation Page 18 Issue 1 05/2004...
Page 47: Rx Agc Limits
EGSM900 DCS1800 RX band filter response compensation EGSM900 and DCS1800 Set operating mode to local mode Select Tuning Alt-u RX Band Filter Response Compensation Select Band EGSM900 Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 19 Company Confidential...
Page 48 Press Manual tuning and a window pops up: Connect an external signal generator to the RF connector of the phone and set the gen- erator as told in the window. Copyright © 2004 Nokia Corporation Page 20 Issue 1 05/2004...
Page 49 Press OK and a new window pops up. Repeat this sequence 9 times until all channels are done. A typical result will look like this: The EGSM900 has been tuned. Press Save and Continue to proceed to DCS1800 tuning. Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 21 Company Confidential...
Page 50 Set the generator as told in the window. Press OK and a new window pops up. Repeat this sequence 9 times until all channels are done. Copyright © 2004 Nokia Corporation Page 22 Issue 1 05/2004 Company Confidential...
Page 51 A typical result will look like this: Select Input Signal Level -60dBm The DCS1800 has been tuned. Press Save and Continue to finish the tuning. A new win- dow pops up: Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 23 Company Confidential...
Page 52: Tx I/Q Tuning
3kHz Sweep Time 3 sec. Sweep Type Clear/Write Detector Type Max Peak Reference level 35 dBm Marker 1 897.33229 MHz Marker 2 897.4 MHz Marker 3 897.46771 MHz Copyright © 2004 Nokia Corporation Page 24 Issue 1 05/2004 Company Confidential...
Page 53 RX/TX Channel TX PA Mode Free TX Data Type All1 Press Start The following window pops up: Select again in the RF Controls Window: Select TX Power Level Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 25 Company Confidential...
Page 55 2 must exceed 40dB. Tuning is possible by using arrow keys on the keyboard. Pushing the sliders by using the mouse is less sensitive but even possible. Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 27 Company Confidential...
Page 56 1 and 3 must exceed 40dB. Tuning is possible by using arrow keys on the keyboard. Pushing the sliders by using the mouse is less sensitive but even possible. Copyright © 2004 Nokia Corporation Page 28 Issue 1 05/2004...
Page 57 “Save and Continue” Press Stop and the values are stored in the phone. The EGSM TX IQ Tuning is now finished and tuning continues in the DCS1800 band. Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 29 Company Confidential...
Page 58 35 dBm Marker 1 1747.73229 MHz Marker 2 1747.8 MHz Marker 3 1747.86771 MHz The following window pops up: Select in the RF Controls Window: Select TX Power Level Copyright © 2004 Nokia Corporation Page 30 Issue 1 05/2004 Company Confidential...
Page 60 2 must exceed 40dB. Tuning is possible by using arrow keys on the keyboard. Pushing the sliders by using the mouse is less sensitive but even possible. Copyright © 2004 Nokia Corporation Page 32 Issue 1 05/2004 Company Confidential...
Page 61 1 and 3 must exceed 40dB, Tuning is possible by using arrow keys on the keyboard. Pushing the sliders by using the mouse is less sensitive but even possible’ Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 33...
Page 62 Nokia Customer Care The Spectrum Analyzer now shows a plot like this: Press “Save and Continue” and the following window pops up: Now the TX IQ tuning has been finished. Copyright © 2004 Nokia Corporation Page 34 Issue 1 05/2004 Company Confidential...
Page 63 Nokia Customer Care 6b - RF Troubleshooting Note: the optimal values for “TX I and Q Offset” and “ Amplitude and Phase Difference” vary from phone to phone. Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 35 Company Confidential...
Page 64 Select Band GSM900 Active Unit Press Start and the following window pops up: If you are using a spectrum analyser, make the necessary settings. Press OK to continue. Copyright © 2004 Nokia Corporation Page 36 Issue 1 05/2004 Company Confidential...
Page 65 Target values. The Power levels may differ from Phoenix mentioned target power lev- els. Press “Save and Continue” and the tuning continues with DCS1800 power level tuning. Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 37 Company Confidential...
Page 66 If you are using a spectrum analyzer, make the necessary settings. Press OK to continue. The setup should now look like this: Tune Base level to -28dBm. Adjust DAC Values for Power Level 0 (29.9dBm), 11 (8.6dBm) and 15 (1.5dBm). The Power Copyright © 2004 Nokia Corporation Page 38 Issue 1 05/2004 Company Confidential...
Page 67 Press “Save and Continue” and TX Power Level Tuning is finished. Auto-Tune with Phoenix Automatic tuning for RH-29 RF parameters is possible. Auto-Tune tunes all RF parame- ters for both of the bands. Needed equipment • PC running Nokia Phoenix SW • Test jig MJ-21 • Power source •...
Page 68 Select used test jig (MJ-21) for the product, from the “Product” menu. If MJ-21 is not there, you have to add it. See figure below: Figure 17: Add jig for the product Copyright © 2004 Nokia Corporation Page 40 Issue 1 05/2004...
Page 69 Wait until phone information is shown in the lower right corner of the screen. Check that there is right jig selected and losses set correctly, as described previously. Start auto-tune Select Tuning Alt-u Auto-Tune Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 41 Company Confidential...
Page 70 RH-29 Company Confidential 6b - RF Troubleshooting Nokia Customer Care See figure below: Figure 19: Auto-Tune Wait until Auto-Tune starts properly, that is “Tune”-button becomes active. Copyright © 2004 Nokia Corporation Page 42 Issue 1 05/2004 Company Confidential...
Page 71 Press “Tune”, and Phoenix will do all the tunings, both TX and RX. That will take about a couple of minutes. If autotuning can be made successfully, you will see following mes- sage: Figure 20: Autotuning done Copyright © 2004 Nokia Corporation Issue 1 05/2004 Page 43 Company Confidential...
Page 72 6b - RF Troubleshooting Nokia Customer Care Press “OK”, and you’ll see the tuning results, as in figure below: Figure 21: Results of Auto-Tune Tunings are now done. Copyright © 2004 Nokia Corporation Page 44 Issue 1 05/2004 Company Confidential...
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