CCS Technical Documentation RH-10 Series Transceivers Troubleshooting Issue 1 09/2002 Confidential Nokia Corporation
RH-10 Troubleshooting Page 2 CCS Technical Documentation Nokia Corporation Confidential Issue 1 09/2002
RH-10 Troubleshooting CCS Technical Documentation Contents Page No Transmitter Troubleshooting.......................................................................................... 5 Tuning Information ........................................................................................................ 5 ST Batman VHFPLL ...................................................................................................5 ST TX Detector Cell ...........................................................
RH-10 Troubleshooting CCS Technical Documentation Reading RSSI and AGC PDM Values from the Phone .......................................... 34 Loading PRLs into the Phone.................................................................................. 35 Changing Between Local Mode and Normal Mode................................................ 35 Baseband Test Tone for AMPS Transmitter Tests.................................................. 36 Block Diagrams .............................................
RH-10 Troubleshooting CCS Technical Documentation Transmitter Troubleshooting The Diva troubleshooting section includes tuning information, troubleshooting test, probing points, and block diagrams. Tuning Information ST Batman VHFPLL This is one of the phone’s self-tests, which gives either a Pass or Fail result only. The VHFPLL is inside the Batman IC. The phone checks the VHFPLL’s lock detect bit. If this bit indicates that the PLL is unlocked, the test will fail.
RH-10 Troubleshooting CCS Technical Documentation 1 TX_IF_AGC to -80 TX_RF_AGC to -512 PA_AGC to -512 2 TX_IF_AGC to +511 TX_RF_AGC to -512 PA_AGC to +511 3 TX_IF_AGC to -80 TX_RF_AGC to +511 PA_AGC to +511 Troubleshooting: If there is a failure associated with only some of the cases above, check the AGC voltages and components of the associated PDMs as described in Tables 1 and 4. For problems with the IF or RF AGC, also check Robin and supporting components.
RH-10 Troubleshooting CCS Technical Documentation hot very quickly. Troubleshooting: If the phone was recently transmitting in Cell band at full power for an extended period of time, it is probably hot for that reason. Let it cool down for a few minutes before proceeding. If it still fails, there may be either a short on the board or a problem with the PA Temp circuitry. To check PA Temp circuitry, check R808, C232, R202, and D200. If a short is suspected, check the Cell PA first.
RH-10 Troubleshooting CCS Technical Documentation The DC offset is returned for I (or Q). Manual Verification: Using the “RF Tuning” dialog box in Phoenix, set mode to Self Tune, and choose this tuning. Troubleshooting: Check Batman (N701) and supporting components. Test TX Start-up Current This test turns on the AMPS transmitter (PCS transmitter for PCS-only phones) and measures current of the whole phone—which can detect some assembly errors.
RH-10 Troubleshooting CCS Technical Documentation 1 ppm at 1880 MHz than it is at 19.2 MHz. Additionally, the tone at 1880 MHz can be measured without taking the phone apart. The result of this test is a PDM value for the AFC DAC, which must be within +/- 150, corresponding to 2.2v on the VCTCXO control pin (pin 1) and the carrier centerd within +/- 100Hz.
RH-10 Troubleshooting CCS Technical Documentation C503, and D200. If the control voltage on pin 1 of G501 is not 2.2v, but the carrier is centered, then there is a problem with the VCTCXO G501. If there is 2.7v on pin 4 and the soldering is correct, then replace G501. 5 If the carrier cannot be centered, check to see if you can adjust to 2.2v on pin 1 of G501. If you can, within the PDM range of +/- 150, then the circuitry that delivers the voltage is working correctly, and the VCTCXO has a problem.
RH-10 Troubleshooting CCS Technical Documentation TN TX DC Offset Carrier Suppression (See TN TX DC Offset Reference Power) tuning section. This step reports the delta between the reference at 836.52 + 20 kHz and the minimum carrier level at 836.52 MHz. The result is a delta in dB between the reference at 836.52 MHz + 20 kHz and the minimum carrier level at 836.52 MHz found by adjusting the DC offsets for I and Q individually. The delta should be at least 35 dB.
RH-10 Troubleshooting CCS Technical Documentation The results are TX power readings in dBm of the transmitted signal corresponding to given PDM settings of the Cell TX IF AGC. Manual Verification: Set the phone in local mode; then program it to Cell CDMA RX/TX mode on channel 384. Set modulation to IS95 voice. Set the Cell PA PDM to +218 decimal and the TX RF AGC to -512 decimal, using the sliders in the PDM dialog box under the RF drop-down menu.
RH-10 Troubleshooting CCS Technical Documentation Manual Verification: Turn on the cell CDMA transmitter in Phoenix, using the RF Main Mode dialog box, and set it to channel 384. Set modulation to IS95 voice. Set the TX_IF_AGC PDM to 0 decimal. Set the PA AGC PDM to +218 decimal. Set the TX RF AGC PDM to -512 decimal. Adjust the TX IF AGC PDM so that the transmitted tone at 836.52 MHz measures +11 dBm +/- 0.5 dB on the antenna connector, using a spectrum analyzer (use 0 as a starting point).
RH-10 Troubleshooting CCS Technical Documentation Manual Verification: See previous section. Troubleshooting: See previous section. TN TX RF AGC Cell Po (0) [or (1), or (2)] This tuning characterizes the RF AGC curve by entering PDM values to the RF AGC and measuring the output power. The results are TX power readings in dBm of the transmitted signal measured for each of the listed PDM settings of the Cell TX RF AGC. Manual Verification: Set up the transmitter as described in tuning 24.3 above.
RH-10 Troubleshooting CCS Technical Documentation Manual Verification: Set the phone to local mode and program it to Cellular (or PCS) CDMA RX/TX mode on channel 384 (or 600 for PCS), using the Main Mode dialog box. Using the Phoenix RF Tuning dialog box, choose “mode” = RF Tuning and choose this test. Adjust G_Offset in the “values” dialog box line until the TX output power (measured on the RF connector with a spectrum analyzer) is equal to -8.0 dBm +/- 0.5 dB.
RH-10 Troubleshooting CCS Technical Documentation Set the TX_IF_AGC to the value determined in tuning 24.3 above to give +11 dBm on the output. Change the TX RF AGC to the settings in the following table, and measure the TX power levels. Check to see that they are within the specified range.
RH-10 Troubleshooting CCS Technical Documentation Channel Cell Low 991 LowMid 107 MidLow 245 Mid 384 MidHigh 512 HighMid 660 High 799 Troubleshooting: If -8 dBm cannot be attained, troubleshoot Cell TX. TN G_Offset Cell MD See previous tuning (TN TX Gain Comp Cell (or PCS) Po MD (or LO, LM, ML, MH, HM, or HI)). This step reports G_Offset. The result is the value of G_Offset, which gives -8.0 dBm transmitted power. Manual Verification: See the previous tuning.
RH-10 Troubleshooting CCS Technical Documentation TN AMPS PL3 (or 4, 5, 6, or 7) Po This procedure tunes power levels 3 through 7, all on the center channel. (Power level 0 was tuned in the previous test. Power levels 1 and 2 are the same as 0 for this phone.) The result is measured trasmit power in dBm for power levels 3 through 7 on channel 384.
RH-10 Troubleshooting CCS Technical Documentation TN TX Limiting Cell CDMA2000: Po This is the same as the previous tuning (TN TX Limiting Po Cell IS95, Low channel (or LowMid, MidLow, Mid, MidHigh, HighMid or High channel)), except that CDMA2000 (C2K) modulation is used instead of IS95. For an explanation of result, see the previous tuning. Manual Verification: Same as the previous tuning, except choose the CDMA2000 tuning in the RF Tuning dialog box. Troubleshooting: Same as previous tuning.
RH-10 Troubleshooting CCS Technical Documentation RX_IF_AGC PDM value and, if needed, voltage. RSSI should be within +/- 2 dB of the actual power in dBm on the RF connector. The AGC will try to keep the same amplitude on Batman output; therefore, if the AGC value is larger than normal, this indicates that the AGC is compensating for loss in the chain prior to the variable gain amplifier.
RH-10 Troubleshooting CCS Technical Documentation Probing/Troubleshooting Overview When measuring CDMA transmit signals, if the spectrum analyzer does not have a CDMA personality card, the CDMA signal power can be approximated by setting the resolution bandwidth to 1 MHz and using the marker. CDMA signal power is measured by integrating power over a 1.23 MHz bandwidth while the marker measures power at only one frequency.
RH-10 Troubleshooting CCS Technical Documentation Probing Tables Table 1: Transmit Output Power and Associated AGC PDM values and voltages channel 384 AMPS TX RF AGC TX IF AGC PDM value voltage PDM value voltage Probed RF power on Balun Out PA AGC PDM value voltage RF power on RF connector typical v typical v dBm typical v dBm -409 0.17 -102 0.70 -11.2 +/- 3 dB -19 0.84 25.5 (PL0) -409 0.17 -89 0.72 -13.2 +/- 3 dB -123 0.66 24.2 (PL3) -409 0.17 -73 0.75 -15.
RH-10 Troubleshooting CCS Technical Documentation Table 2: RF/Analog Probing for Transmitter Probing Point Probing Location on the board Probed Absolute Power (dBm) or gain/loss (dB) or voltage (v) Where to start checking if RF power not correct (soldering, shorts, DC power applied if active, correct voltage of DC signals, otherwise replace) Robin (N601) out=Balun (T604) in 2a and 2b, Figure 1 Easiest to probe on balun output as per Table 1.
RH-10 Troubleshooting CCS Technical Documentation Table 2: RF/Analog Probing for Transmitter Probing Point Probing Location on the board UHF LO at 1009.62 MHz for channel 384 10, Figure 1. Can probe on top of plastic to check for presence of LO, but won’t read accurate power VHF LO at 346.2 MHz for cell band, any channel 11, Figure 1 (You can touch top of plastic to verify presence of LO, but this won’t measure amplitude accurately.
RH-10 Troubleshooting CCS Technical Documentation Voltage on UEM output for mode Table 3: DC Probing for Transmitter Item to check Setting DC probing location on board DC voltage TX RF AGC See Table 1 12, Figure 3 See Table 1 D400 (UPP), R433, C426, R434, C427, C429, V420, N601 TX IF AGC See Table 1 13, Figure 3 See Table 1 D400 (UPP), R427, C422, R428, C423, C430, V421, N601 PA AGC See Table 1 14, Figure 3 See Table 1 D400 (UPP), R430, C424, R431, C425, C431, V422, N601 PD_CELL High f
RH-10 Troubleshooting CCS Technical Documentation Table 4: Receiver Probing (PDM and voltage) PDM lower limit PDM upper limit PDM mean Voltage for PDM mean RX power in AMPS ch 384 HighGain 127 215 173 1.19 -65 dBm CELL ch 384 LowGain -1 106 60 0.99 -65 dBm CELL ch 384 HighGain -119 -3 -64 0.78 -95 dBm 7 RSSI should be within +/- 2 dB of actual RX signal above -104 dBm and +2/-4dB below -104 dBm 8 In AMPS, ensure 230 mV on I,Q traces of Batman out, probing point 38 of Figure 3.
RH-10 Troubleshooting CCS Technical Documentation Table 6: RF Probing for AMPS back-end Receiver Probing point Probing location on the board Probed Absolute Power (dBm) or gain/loss (dB) What to check if RF power not correct (soldering, shorts, DC power applied if active, correct voltage of DC signals, otherwise replace) Alfred (N750) mixer out = AMPS RX IF saw (Z752) in 36, Figure 2 This point not 50 ohms. Will measure approx. -28 dBm for -52 dBm input and RX AGC PDM = 225 N750.
RH-10 Troubleshooting CCS Technical Documentation Table 8: RF Probing for Cell CDMA Back-end Receiver Probing point Probing location on the board Probed Absolute Power (dBm) or gain/loss (dB) What to check if RF power not correct (soldering, shorts, DC power applied if active, correct voltage of DC signals, otherwise replace) Alfred (N750) mixer out = CDMA RX IF saw (Z753) in 46, Figure 2 This point not 50 ohms. Will measure approx.
RH-10 Troubleshooting CCS Technical Documentation Probing Diagrams Figure 1: Test Points Figure 2: Test Points Issue 1 09/2002 Nokia Corporation Confidential Page 29
RH-10 Troubleshooting CCS Technical Documentation Figure 3: Test Points Phoenix Instructions Turning on Cell CDMA Transmitter From the RF menu, select Main Mode from the drop-down menu. This opens the “Main Mode” dialog box. To turn on the transmitter, first turn on the carrier by highlighting “RX/TX” in the top subwindow. (This also turns on the receiver.) Enter the appropriate channel in the “Channel” subwindow and then click the Set button in the upper righthand portion of the dialog box.
RH-10 Troubleshooting CCS Technical Documentation Highlight “Rho” in the Functions subwindow at left, and check “Rho ON” in the State field. Check either “Cell” or “PCS” in the Band field. Under Radio Configuration, choose the desired configuration. (Note: C2K is an abbreviation for IS2000.) When you have completed all the necessary information, click the Execute button. Turning on AMPS Transmitter Eventually, the method will be to use the “RF Main Mode” window, choosing “AMPS” in the Band field.
RH-10 Troubleshooting CCS Technical Documentation Choose the “Data” option in the Address space field; enter the address; leave the Subcount (words) field entry at “1”; click the Add button. The address will be displayed in the subwindow in the lower half of the dialog box. Use this method to enter both the AFC Disable and AGC Disable addresses. Note: AFC Disable and AGC Disable addresses may be obtained from R&D. These addresses may change, depending upon software version.
RH-10 Troubleshooting CCS Technical Documentation Verifying a Single Manual Tuning Open the “RF Tuning” dialog box, shown here. Note: The tuning descriptions given in the Tuning section describe the tuning process and provide information as to what values will be returned to you from the phone, if any. According to these descriptions, click “Self-Tuning” for self tunings or “RF Tuning” for the others. Choose the appropriate test from the “Tuning Names” list.
RH-10 Troubleshooting CCS Technical Documentation Reading Tuning Values from the Phone Open the “Batch Tune” dialog box, shown here. To read the tuning values from the phone, click the Read All button under the Phone heading. However, if you want the tuning values to be displayed, you must first load the template file by clicking the Load File button, which is located under the Parameter File heading. Note: Ensure that the template file used is appropriate for the software version in the phone.
RH-10 Troubleshooting CCS Technical Documentation Loading PRLs into the Phone Using the “Preferred Roaming List” dialog box, click the Load PRL From File button and choose the desired file from the list that displays in the left side of the dialog box. (When you choose your desired file, note that the text color changes to blue.) Click the Write PRL To Phone button. At the bottom of the dialog box, a status message will indicate if the file was loaded correctly.
RH-10 Troubleshooting CCS Technical Documentation should be in local mode. When in local mode, the phone’s software is not running, and it will not search for a pilot. To switch between normal and local modes, use the “Phone Control” dialog box, shown here. This setting will be lost if the phone is powered down. Baseband Test Tone for AMPS Transmitter Tests To add a baseband test tone to the AMPS transmitter, open the “RF Test Tone” dialog box, shown here, and set the parameters as desired.
RH-10 Troubleshooting CCS Technical Documentation Block Diagrams Figure 4: Transmitter Block Diagram Figure 5: Receiver Block Diagram Issue 1 09/2002 Nokia Corporation Confidential Page 37
RH-10 Troubleshooting CCS Technical Documentation Figure 6: Synthesizer Block Diagram Page 38 Nokia Corporation Confidential Issue 1 09/2002
RH-10 Troubleshooting CCS Technical Documentation TX I TX IF CELL 173.6 MHz TX VHF CELL LO 346.2 MHz 1 0° 2 90° CELL 824.04 - 848.97 30 kHz MHz Steps TX Block TX Q UHF LO CELL 997.14 - 1022.07 MHz, 30 kHz Step RX I RX VHF CELL LO 256.2 MHz RX Q 1 0° 2 90° RX Block RX IF CELL 128.1 MHz CELL 869.04 - 893.97 MHz 30 kHz Steps Figure 7: Frequency Plan Figure 8: Distribution of VCTCXO tone at 19.
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RH-10 Troubleshooting CCS Technical Documentation Figure 10: Detailed Batman Block Diagram Issue 1 09/2002 Nokia Corporation Confidential Page 41
RH-10 Troubleshooting CCS Technical Documentation Figure 11: Block Diagram for both Shark (Cell, AMPS, PA) Figure 12: CDMA AGC Algorithm Page 42 Nokia Corporation Confidential Issue 1 09/2002
RH-10 Troubleshooting CCS Technical Documentation 90 80 AM PS AGC 70 60 GAIN dB IF AG C TOTAL 50 40 30 PA AGC 20 RF AGC 10 7 0 -40 -30 -20 -10 0 O utput Power dBm dBm dBm 8 6 5 12 16 10 4 3 2 AM PS PW R LEVE L LEVELS 24 20 30 Figure 13: AMPS AGC Algorithm Issue 1 09/2002 Nokia Corporation Confidential Page 43
RH-10 Troubleshooting Page 44 CCS Technical Documentation Nokia Corporation Confidential Issue 1 09/2002
