Nokia RH-57 Series Troubleshooting Manual
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Nokia RH-57 Series Troubleshooting Manual

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Nokia Customer Care
2112 (RH-57) Series Transceivers
Troubleshooting - RF
©2004 Nokia Corporation
Issue 1 07/2004
Company Confidential

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  • Page 1 Nokia Customer Care 2112 (RH-57) Series Transceivers Troubleshooting - RF ©2004 Nokia Corporation Issue 1 07/2004 Company Confidential...

  • Page 2: Table Of Contents

    2112 (RH-57) Troubleshooting - RF Nokia Customer Care Contents Page RF Troubleshooting............................3 2112 General Troubleshooting Notes ....................3 Phone Components ............................. 4 Phone Cannot Make a Call........................5 Transmitter Troubleshooting ........................6 Low Tx Power ............................. 6 Cell Transmitter Setup..........................7 Cell Transmitter Path ..........................

  • Page 3: Rf Troubleshooting

    2112 (RH-57) Nokia Customer Care Troubleshooting - RF RF Troubleshooting 2112 General Troubleshooting Notes First check the RX AGC PDM value when troubleshooting the receiver. The AGC value should be close to the typical values in the tables. The Rx AGC tries to keep a constant amplitude at the output of the receiver chain.

  • Page 4: Phone Components

    2112 (RH-57) Troubleshooting - RF Nokia Customer Care Phone Components Figure 1 and Figure 2 illustrate the main components of the 2112. RF connector LCD module connector Figure 1: RF components (top) ©2004 Nokia Corporation Page 4 Company Confidential Issue 1 07/2004...

  • Page 5: Phone Cannot Make A Call

    2112 (RH-57) Nokia Customer Care Troubleshooting - RF On/Off Switch Cell Duplexer Rx IC “Alfred” LNA+Downconverter Cell Isolator PA PMIC DC-DC Converter Cell Rx RF SAW Filter Cell Tx PA Cell Tx SAW Filter Jedi Tx Up-Converter Battery Converter YODA Rx Downconverter...

  • Page 6: Transmitter Troubleshooting

    2112 (RH-57) Troubleshooting - RF Nokia Customer Care • The phone is tuned and has passed tuning. (Read the tuning parameters using the batch tune component in Phoenix; an untuned phone has all zeros in the tuning file.) • The call box channel is set for a channel in PRL.

  • Page 7: Cell Transmitter Setup

    2112 (RH-57) Nokia Customer Care Troubleshooting - RF Cell Transmitter Setup Use the following steps to set up the phone for Tx troubleshooting in Phoenix. 1. Open the Phone Control dialog box. Figure 3: Phone Control dialog box for Tx troubleshooting 2.
  • Page 8 2112 (RH-57) Troubleshooting - RF Nokia Customer Care 5. Select the Rho ON check box on the CDMA Control dialog box. Figure 5: CDMA Control dialog box for Tx troubleshooting 6. Click Execute. 7. At this point you should be able to measure Tx Pout at the RF connector. The cell band Tx Pout =0 to 2 dBm.

  • Page 9: Cell Transmitter Path

    2112 (RH-57) Nokia Customer Care Troubleshooting - RF 12. Ensure that all of the pins have a value of H in the State column. (Click the L values to change them to H values.) 13. Adjust the following PDM field values on the RF PDM dialog box: Tx IF AGC = -280 •...
  • Page 10 2112 (RH-57) Troubleshooting - RF Nokia Customer Care Table 1: Cell Transmitter Test Points (Continued) Typical Typical Test Value/ Value Part* Function Comments Point Frequency Frequency HP85024A Prod Probe C638T, C654T, 2.7V dc VHF VCO/PLL, IQ modulator C633R, supply from UEM...
  • Page 11 2112 (RH-57) Nokia Customer Care Troubleshooting - RF Figure 8 shows each test point for the Jedi TXIC section from Table 1, “Cell Transmitter Test Points,” on page 9. Always attach a 20 dB pad (11881-60001) when probing with an HP85024A high frequency probe.
  • Page 12 2112 (RH-57) Troubleshooting - RF Nokia Customer Care Figure 9 shows each testing point for the PA section from Table 1, “Cell Transmitter Test Points,” on page 9. Always attach a 20 dB pad (11881-60001) when probing with an HP85024A high frequency probe.

  • Page 13: Cell Power Amplifier

    2112 (RH-57) Nokia Customer Care Troubleshooting - RF Table 2: Tx AGC Tuning Steps (Continued) Tx Tuning Tx AGC Target High AGC Step PDM Value Power Limit Limit Tx AGC (6) Tx AGC (7)* -280* *Not an actual FlaLi tuning PDM. The PDM produces approximately 25dBm at the antenna connector.
  • Page 14 2112 (RH-57) Troubleshooting - RF Nokia Customer Care Table 6: PMIC Measurements Label Test Point Units Depends On Comments Pin 1 IC enable = GenIO 10 Pin 2 Control 0 = GenIO 12 Pin 3 Control 1 = GenIO 13 Pin 5 0.75 - 4...

  • Page 15: Cell If/Rf Agc And Pa Control

    2112 (RH-57) Nokia Customer Care Troubleshooting - RF Table 7: Good Phone PMIC Resistances (Continued) Resistance 115k 1.3M 1.18M Cell IF/RF AGC and PA Control Table 8, “Cell CDMA Channel 384 (Skyworks PA),” on page 16 illustrates the PDM values and their typical values for the IF AGC, RF AGC Jedi Pout, gain steps, and the PA VCC levels.
  • Page 16 2112 (RH-57) Troubleshooting - RF Nokia Customer Care Table 8: Cell CDMA Channel 384 (Skyworks PA) Tx RF AGC Tx IF AGC Jedi Po PA Gain Step PA Vcc Conn RF Typical Test Typical Test Typical Test Typical Test Pout...

  • Page 17: Cell Power Detector

    2112 (RH-57) Nokia Customer Care Troubleshooting - RF Cell Power Detector The following tables illustrate the measurements required for troubleshooting the cell power detector. Table 9: Cell Power Setup Mode Band Chnn Local CELL Input Chnn Tx Freq Rx Freq 836.52...
  • Page 18 2112 (RH-57) Troubleshooting - RF Nokia Customer Care Table 11: Detector Reference and DC Supply label Test Point Typical Value Det Ref left-C803 Det Supply bottom-C257 ©2004 Nokia Corporation Page 18 Company Confidential Issue 1 07/2004...

  • Page 19: Tx System Block Diagram

    2112 (RH-57) Nokia Customer Care Troubleshooting - RF Tx System Block Diagram Note: See the Schematics chapter for a 2112 transmitter schematic. Antenna Antenna Antenna Antenna RF VGA Bandpass PWR Amplifier (RF AGC PDM) Duplexer Duplexer Duplexer Duplexer BB I LPF...

  • Page 20: Receiver Troubleshooting

    2112 (RH-57) Troubleshooting - RF Nokia Customer Care Receiver Troubleshooting Rx IF Use Phoenix to perform the following steps for troubleshooting the receiver. Together with the VCO frequency and level verification, this test should be the first test for a non- working receiver.
  • Page 21 2112 (RH-57) Nokia Customer Care Troubleshooting - RF Figure 12: RF Main Mode dialog box for Rx IF troubleshooting 5. Click Set. Note: Be sure that the “RF Main Mode set successfully...” message appears in the status bar. 6. Use a spectrum analyzer to test TP3 (I+,I-, Q+, Q-). Set the S.A to 300KHz center frequency, 200KHz SPAN, and +10dBm reference level.
  • Page 22 2112 (RH-57) Troubleshooting - RF Nokia Customer Care Table 13: Rx IF Troubleshooting (Continued) Typical Typical Value/ Value Step # Part Function Comments Frequency Frequency HP85024A Prod Probe I+, I-, Q+, Q- I/Q outputs 300KHz tone -69/-84 dBm Baseband differential out-...
  • Page 23 2112 (RH-57) Nokia Customer Care Troubleshooting - RF Figure 13 shows each test point as listed in Table 13. Figure 13: (Top) PWB. (Bottom left) A zoomed view of the testing points on the Rx IF section. (Bottom right) A zoomed view of the Rx IF section with part numbers.
  • Page 24 2112 (RH-57) Troubleshooting - RF Nokia Customer Care Figure 14 shows an alternate part orientation. Notice that Pin 1 is rotated 180 degrees compared to the first filter as shown in Figure 13 on page 23. All test points and values are the same.

  • Page 25: Switching The Gain

    2112 (RH-57) Nokia Customer Care Troubleshooting - RF Switching the Gain Use the following steps if the receiver is not working properly and you need to switch the Rx gain state. 1. Open the Phone Control dialog box. Figure 15: Phone Control dialog box for switching the Rx gain state 2.
  • Page 26 2112 (RH-57) Troubleshooting - RF Nokia Customer Care 5. Connect a signal generator in CW mode (881.52MHz, -25dBm) to the RF connector. If you do not have a generator, use the Call Box Amps Mode RF Generator, Channel 384, -25dBm and set the FM modulation to 100Hz, deviation 400Hz.

  • Page 27: Rx Rf

    2112 (RH-57) Nokia Customer Care Troubleshooting - RF Rx RF The following Rx RF Troubleshooting table indicates the test points to probe when troubleshooting the Rx RF. It is recommended that you follow the steps in order. See Figure 18 on page 28 for an illustration of the test points.
  • Page 28 2112 (RH-57) Troubleshooting - RF Nokia Customer Care Antennae Connector (top side) Figure 18: (Top left) PWB. (Top right) The antenna connector on the opposite side of the PWB, (Bottom left) A zoomed view of the testing points on the Rx RF section. (Bottom right) A zoomed view of the Rx RF section with part numbers.

  • Page 29: Rx Agc (Cell Mode)

    2112 (RH-57) Nokia Customer Care Troubleshooting - RF Rx AGC (Cell mode) The following Rx RF AGC PDM vs. AGC Voltage table shows the Rx RF AGC PDM vs. AGC voltages in local mode on channel 384. Table 15: Rx RF AGC PDM vs. AGC Voltage...
  • Page 30 2112 (RH-57) Troubleshooting - RF Nokia Customer Care Table 16: Rx AGC vs. RF Pin for CELL Band (Continued) Conn RF Pin CELL RF AGC Comments -107 0.470 UNITS ©2004 Nokia Corporation Page 30 Company Confidential Issue 1 07/2004...

  • Page 31: Receiver Block Diagram

    2112 (RH-57) Nokia Customer Care Troubleshooting - RF Receiver Block Diagram Note: See the Schematics chapter for a 2112 receiver schematic. CDMA I/Q Down LNA SW Control BB Filter Converter CELL IF SAW BB AMP To BB CDMA BB Filters...

  • Page 32: Synthesizer Troubleshooting

    2112 (RH-57) Troubleshooting - RF Nokia Customer Care Synthesizer Troubleshooting Faulty synthesizers can cause both Rx and Tx failures during tuning, in addition to the VCTCXO tuning. The following synthesizers are incorporated into the 2112 (RH-57): • UHF (cell) PLL inside Jedi IC (N601) •...

  • Page 33: Vctcxo Tuning

    2112 (RH-57) Nokia Customer Care Troubleshooting - RF Figure 21: RF Main Mode dialog box for synthesizer troubleshooting 4. Click Set. Note: Be sure that the “RF Main Mode set successfully...” message appears in the status bar. 5. Read register templates Jedi(0) bits 10 and 11 for the UHF and Tx VHF lock condition on the RF Register R/W dialog box.
  • Page 34 2112 (RH-57) Troubleshooting - RF Nokia Customer Care in AMPS mode, an HP4406 Tx tester, or a spectrum analyzer (preferably using a lab system 10MHz source as equipment reference). Replace the VCTCXO if the VCTCXO AFC DAC value does not meet the tuning requirements after tuning.
  • Page 35 2112 (RH-57) Nokia Customer Care Troubleshooting - RF 6. Type 10, 13, 12, and 8 in the fields in the PIN # column. Figure 25: General I/O dialog box for VCTCXO tuning 7. Click the Get All button. 8. Change the value for Pin 8 in the Source column to GenIO Output.
  • Page 36 2112 (RH-57) Troubleshooting - RF Nokia Customer Care 11. Adjust the AFC value to center the VCTCXO on the RF PDM dialog box. The tuning range is approximately +/- 10kHz. Figure 26: Manually adjusting the AFC to center VCTCXO 12. Adjust the AFC value so that the output signal is within +/- 100Hz. If you are using an HP4406 or a spectrum analyzer, narrow the span to 1kHz or less.

  • Page 37: Vctcxo Reference Clock

    2112 (RH-57) Nokia Customer Care Troubleshooting - RF VCTCXO Reference Clock Figure 27 shows the 19.2 MHz VCTCXO reference clock. Figure 27: (Top) PWB. (Bottom left) A zoomed view of the testing points on the 19.2 MHz VCTCXO reference clock. (Bottom right) A zoomed view of the 19.2 MHz VCTCXO reference clock with part numbers.

  • Page 38: Synthesizer Block Diagram

    2112 (RH-57) Troubleshooting - RF Nokia Customer Care Synthesizer Block Diagram Note: See the Schematics chapter for an 2112 (RH-57) synthesizer schematic. CELL:457.2MHz CELL:457.2MHz JEDI JEDI counter counter counter counter 367.2MHz 367.2MHz 19.2MHz 19.2MHz VCTCXO VCTCXO CELLl Band UHF VCO...

  • Page 39: Uhf Synthesizer

    2112 (RH-57) Nokia Customer Care Troubleshooting - RF UHF Synthesizer Following are possible causes for an incorrect UHF frequency: • Orientation of Jedi • Power supplies to Jedi PLL (N601) are missing or low (VR7) • Loop filter components are missing or incorrectly installed •...

  • Page 40: Rx Vhf

    2112 (RH-57) Troubleshooting - RF Nokia Customer Care Figure 30: (Top) PWB. (Bottom left) A zoomed view of the Jedi LO/PLL input match components on the UHF synthesizer layout (Bottom right) A zoomed view of the Jedi LO/PLL input match components UHF synthesizer layout with part numbers.

  • Page 41: Tx Vhf

    2112 (RH-57) Nokia Customer Care Troubleshooting - RF Figure 31 shows the layout for the Rx VHF. Figure 31: (Top) PWB. (Bottom left) A zoomed view of the testing points on the Rx VHF section. (Bottom right) A zoomed view of the Rx VHF section with part numbers.
  • Page 42 2112 (RH-57) Troubleshooting - RF Nokia Customer Care Figure 32 shows the layout for the Tx VHF. Figure 32: (Top) PWB. (Bottom left) A zoomed view of the testing points on the Tx VHF section. (Bottom right) A zoomed view of the Tx VHF section with part numbers.

  • Page 43: Tuning Descriptions

    2112 (RH-57) Nokia Customer Care Troubleshooting - RF Tuning Descriptions Tuning Title Description Troubleshooting Tx Detector This is one of the phone's self-tests Check the AGC voltages and components of which gives either a pass or fail result the associated PDMs. For problems with the only.
  • Page 44 2112 (RH-57) Troubleshooting - RF Nokia Customer Care Tuning Title Description Troubleshooting VCTCXO Frequency The purpose of this tuning is to deter- 1) If there is no tone, probe pin 3 of G501 mine what the AFC DAC value needs to for a tone at 19.2 MHz.
  • Page 45 2112 (RH-57) Nokia Customer Care Troubleshooting - RF Tuning Title Description Troubleshooting 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...
  • Page 46 2112 (RH-57) Troubleshooting - RF Nokia Customer Care Tuning Title Description Troubleshooting Tx Gain Comp This tuning ensures that the value of Set the phone to local mode and program it TxdBCtr correctly corresponds to the to Cellular CDMA Rx/Tx mode on channel absolute Tx output power.

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