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© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
1255 Technical TrainingRF Troubleshooting Presentation
NMP-CDMA, San DiegoJan, 2006
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
Disclaimer
Materials current at time of publish and based upon most current R&D Documentation. Please refer to the latest product TB to determine further handset hardware variations if any.
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
Introduction
The mobile terminal uses a Qualcomm MSM6000 baseband with a CDMA single mode engine (Cellular/ 800) consisting of two primary ASICs:
• RFT6122 RF transmitter IC• RFR6122 RF receiver IC
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
PWB Bottom Side
Power management IC
RF transmitter
TX saw filter
power amplifier
cell duplexer
RF receiver
RX saw filter
MSM 6000 Flash IC
19.2MHz TCXO
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
PWB Top Side
RF connector
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
TX Troubleshooting
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
Tx System Block Diagram
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
Tx RF Parts Diagram
TX IC
TX Saw filter Power Amplifier
Cell Duplexer
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
FTM Setup for TX Troubleshooting
1. Connect RF test connector to a spectrum.
2. Set SW1 to “FTM mode” in Module Jig.3. Connect the mobile terminal to a PC via the Module Jig, and connect a power supply.4. Open CCS RF Tools software.5. The FTM dialog box appears.6. “Select COM port” to appropriate one.7. Set “Connect Phone”.8. Set “Set FTM”.9. Set “Set Band” to “CDMA800”.10. Set “Set Channel “to Channel “384”.11. Set “Set PA Range R1” to “on”12. Set TX waveform to “CDMA”13. Set “TX on/off” to “on”.14. Set “TX AGC” to “120”.
Put the PWB on the module jig. Use the following steps to configure FTM for RF troubleshooting.
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
Cell Tx Check from RF connectorUse the following values to check the CDMA Cell Tx functionality from IQ to RF output.1. Start FTM in Local Mode with only the Tx path turned on and “Set AGC” to “100”.2. Transmitter output power at the RF connector to be approximately equal 24dBm/1.23MHz CDMA signal of 836.52MHz .
RF Connector
FSQ26 signal analyzer settings•MEAS->CHAN PWR ACP->CP/ACP STANDARD->CDMA IS95A REV•FREQ->836.52MHZ
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
Tx DC Probe Points
Test Point
Description
Value
1 PA_ON2.94V for PA turning on,
0V for turning off
2 PA_R12.0V for high gain
mode,1.44V for low gain mode
3LOCK_D
ET2.96V for Lock, 0 V for
unlock
4 TX_AGC1.8V for 5dBm, 2.08V for 15dBm, 2.3V for 25dBm.
5 Tx IQ in 0.8 V With oscilloscope: 500 mV p-p
6DAC_RE
F1.83 V
7VREG_MSMP
2.95V
8VREG_R
FTX2.65V7 8
5
3
14
2
6
Table 1
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
Tx DC Probe Points
Test Point Description Value
RF Supply Lines Resistance to Ground
1VREG_MSMP,c705
2.95V >11kΩ to groundU700,U900,U801,U602
2 VPH_PWR,c7003.2~4.2V
>550kΩ to ground U700,U7
3VREG_MSMC,c706
2.75V >45kΩ to ground U700,U401
4VREG_MSMA,c708
2.6V >120kΩ to ground U700,U401
5 VEXT_DC,r7103.2~5.7V
~9.3kΩ to ground Q700
6VREG_TCXO,c723
2.85V >450kΩ to ground U700
7VREG_RFRX,r715
2.65V >350kΩ to ground U700,U900,U801
8VREG_RFTX,c709
2.65V >450kΩ to ground U700,U900,U801
32
41
8765
Table 2
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
Tx RF Probe Points
Test Point
Description Value
1 RFT6122 output 4dBm
2 PA input 2dBm
3 PA output 28dBm
4 RF connector 24dBm
5 UHF LO0dBm at 1763.04MHz
Tx RF Probe Points
4
3
21
5 Table 3
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
Tx path troubleshootingTx pathFaults
Measure DC test points at Table 1 and
Table 2. Is it OK?NO Check PM6610, MSM6000
YES
Measure Tx RF test points 5
at Table 3. Is it OK
NO Change RFT6122
YES
Reflow C920, FL600, C619, U7
YES
Measure Tx RF test points 1
at Table 3. Is it OK
NO Reflow R903, C911
Measure Tx RF test points 2
at Table 3. Is it OK
NO
NO Reflow U7
YES
Measure Tx RF test points 3
at Table 3. Is it OK
YES
Reflow F600, S600Measure Tx RF test
points 4at Table 3. Is it OK
NO
NO Change U7
NO Reflow PM6610 or MSM6000
YES
Check Antenna Module
If RF Antenna feed point pad obstructed , clean the pad. Connect System Simulator to
MS antenna. Is it OK NO
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
Rx Troubleshooting
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
Rx System Block Diagram
The RFR6122 IC provides the Zero-IF receiver signal path for Cellular-CDMA reception. For this chipset, Cellular-CDMA refers to band classes 0 and 3 as defined by the cdma2000 standard, with mobile station receivers operating between 832 and 894 MHz. The Rx signal path includes the LNA, quadrature downconversion, and baseband functions.The Cellular-CDMA receive signal is routed from the antenna to the RFR6122 IC via the duplexer. The analog baseband outputs interface with one of Qualcomm’s Mobile Station MSM6000 devices that also provide status and control signaling. Integrated RX LO circuits, ideally supplemented by the RFT6122 transmitter IC, provide frequency plan flexibility and further reduce PCB parts count.
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
FTM setup for RX troubleshooting
1. Connect RF test connector to a spectrum.
2. Set SW1 to “FTM mode” in Module Jig.
3. Connect the mobile terminal to a PC via the Module Jig, and connect a power supply.
4. Open CCS RF Tools software.5. The FTM dialog box appears.6. “Select COM port” to appropriate one7. Set “Connect Phone”. 8. Set “Set FTM “.9. Set “Set Band” to “CDMA800”.10. Set “RF Channel “to Channel “384”.11. Set “LNA Range” to whatever
needed.
Put the PWB on the module jig. Use the following steps to configure FTM for RF troubleshooting.
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
Cell Receiver Check from RF to IQ
shows the Cell spectrum with an inject tone at -75 dBm, as well as the IQ output test points. Note that DC is present on the IQ output test points. All test points should be approximately equal.
Use the following values to check the CDMA Cell Rx functionality from RF to IQ output.1. Start FTM Mode with only the Rx path turned on and set LNA_GAIN_STATE=0.2. Inject a -75 dBm CW signal of 881.82 MHz (i.e. 300 kHz offset from 881.52 MHz or 10 channels away).3. Measure a 300 kHz tuning on the analyzer. You should see a typical -52 dBm IQ tuning for CDMA Cell.
FSQ26 signal analyzer settings•RBW-> 3 kHz•VBW-> 300 Hz•Sweep Time-> 450 ms•Reference Level-> -20 dBm•FREQ-> 300 kHz•Span-> 200 kHz
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
3
1
2
Receiver DC Probe Points
Test Point
Description Value
1 VREG_MSMP ,r806 2.95V
2 VREG_RFRX,r801 2.6V
3 LNA BIAS,L807 2.6V
Table 4
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
Receiver RF Probe Points
Test Point
Description Value
1 LNA IN -28dBm
2 RX SAW INPUT -48dBm
3 RX SAW OUTPUT -51dBm
1
2
3
Table 5
In RF probe test, an external signal source of –25 dBm was injected to the RF input. Set LNA GAIN STATE = 3 .The signal was then traced throughout the receiver chains. An CMU200 call box is recommended. (Open non-signaling mode, press the SG soft button, and then select CW.) Inject a continuous wave (CW) for Cell (881.52MHz) at a fixed –25 dBm power level. Measurements were taken with the RF Probe. Signal levels are approximate, and the accuracy may be +/- 2 dB or more depending on the probe position and grounding.
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
Rx Path TroubleshootingRx Path Troubleshooting
Rx pathFaults
Measure DC test points at Table 4.
Is it OK?NO
YES
Measure Rx RF test points 1
at Table 5. Is it OK
NOReflow L804, C814,
RFR6122
YES
Reflow U800
YES
Measure Rx RF test points 2
at Table 5. Is it OK
NO Reflow C813, L803
Measure Rx RF test points 3
at Table 5. Is it OK
NO
NO Change RFR6122
Check PM6610 NO Reflow PM6610
Check Antenna Module
Connect System Simulator to MS antenna. NO
YES
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
RF Path Loss
• Set COM port and Input the maximum output power of the golden phone in dBm. Then, click “Start” button to run program.
• After the program is done, the path loss will be shown on the screen and recorded for the RF calibration and Call Test program. Click “Quit” for closing this program.
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
RF Tuning and Calibration
1. Connect RF test connector to a CMU200 or Agilent 8960.
2. Set SW1 to “FTM mode” in Module Jig.3. Connect the mobile terminal to a PC via
the Module Jig, and connect a power supply.
4. Open CCS Service SW and run RF Calibration function
5. Select “Tester Selection” Agilent 8960 or CMU200
6. Set cable loss value as the result from running “Path Loss” to Loss (dB)
7. “Select COM port” to appropriate one8. Press “Start”. 9. If tuning and calibration is successful ,
screen will shown “PASS”, otherwise, check the error code table
Put the PWB on the module jig. Use the following steps to configure FTM for RF troubleshooting.
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
RF Calibration Error Code
• Error Message Table:
Error Message Upper Limit Lower Limit Debug
FAIL:TESTER Check your GPIB connection.
FAIL:COMPORT Check your COM connection.
FAIL:DVGA 3000 1700 Possible reason:Default NV table could be wrong.File system is not exist.Image version inconsistent.
FAIL:LNA0 150 100 Check Rx/Tx path components
FAIL:LNA1 250 150 Check Rx/Tx path components
FAIL:LNA2 410 300 Check Rx/Tx path components
FAIL:LNA3 560 430 Check Rx/Tx path components
FAIL:LOW_GAIN 25 dBm 5 dBm Synthesizer unlock
FAIL:HIGH_GAIN 27 dBm 5 dBm Synthesizer unlock
FAIL:HDET 210 120 Check Rx/Tx path components
© Nokia 1255_RF_Training / Jan 2006 / CFS Company Confidential
Questions???Thank you for your attention!