Nokia 6255 Rf Description And Troubleshooting
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Nokia 6255 Rf Description And Troubleshooting

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Nokia Customer Care
6255/6255i/6256/6256i (RM-19)
Mobile Terminal
RF Description and

Troubleshooting

©2005 Nokia Corporation
Issue 2 05/2005
Company Confidential

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Summary of Contents for Nokia 6255

  • Page 1: Troubleshooting

    Nokia Customer Care 6255/6255i/6256/6256i (RM-19) Mobile Terminal RF Description and Troubleshooting ©2005 Nokia Corporation Issue 2 05/2005 Company Confidential...

  • Page 2: Table Of Contents

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Contents Page Introduction ..............................5 Mobile Terminal Components ........................6 Main PWB ..............................6 UI (Secondary) PWB ............................ 8 Preliminary RF Troubleshooting....................... 10 Mobile Terminal Cannot Make a Call ....................10 Tx Power Low ..............................10 Transmitter RF Troubleshooting ......................
  • Page 3 6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Rx VHF LO Troubleshooting ........................59 Tx UHF LO (N7000) Schematic ......................60 Tx UHF LO (N7000) Troubleshooting ....................61 GPS Troubleshooting........................... 62 GPS RF Block Diagram ..........................62 GPS RF Schematic .............................63 GPS Troubleshooting Setup ........................64 Self Test Failure ............................
  • Page 4 6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care This page intentionally left blank. ©2005 Nokia Corporation Page 4 Company Confidential Issue 2 05/2005...

  • Page 5: Introduction

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Introduction When troubleshooting the receiver, first check the RX_AGC PDM value. 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 6: Mobile Terminal Components

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Mobile Terminal Components The mobile terminal includes two PWB boards, the main PWB and the UI PWB. Main PWB Following are the components of the main PWB. Tx I/Q signal test points...
  • Page 7 6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Synthesizer IC Cell duplexer Headset jack PCS coupler PCS duplexer Cell coupler Diplexer Rx RF Cell filter Antenna N7160: connector Rx front-end Rx RF PCS filter PCS PA Rx IF AMPS filter...

  • Page 8: Ui (Secondary) Pwb

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care UI (Secondary) PWB Following are the components of the UI PWB. GPS ceramic filter GPS LNA GPS SAW filter Figure 3: UI PWB component layout - top ©2005 Nokia Corporation Page 8...
  • Page 9 6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting GPS antenna GPS 16.368 MHz GPS ceramic antenna matching circuitry TCXO GPS antenna connector GPS RF IC GPS BB IC Figure 4: UI PWB component layout - bottom ©2005 Nokia Corporation...

  • Page 10: Preliminary Rf Troubleshooting

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Preliminary RF Troubleshooting The following sections identify steps to troubleshoot some common RF issues. Mobile Terminal Cannot Make a Call Verify the following if the mobile terminal cannot make a call: 1.

  • Page 11: Transmitter Rf Troubleshooting

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Transmitter RF Troubleshooting Following are the main Tx RF components. Antenna PCS Tx SAW filter Cell Tx SAW filter Cell PA PCS PA Diplexer connector BOTTOM SIDE TOP SIDE Cell coupler...

  • Page 12: Transmitter Block Diagram

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Transmitter Block Diagram Following is the block diagram for the Tx RF system. N7000 Tx IC Figure 6: Tx system block diagram ©2005 Nokia Corporation Page 12 Company Confidential Issue 2 05/2005...

  • Page 13: Transmitter Schematics

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Transmitter Schematics The following schematics are for general reference only. See the Schematics chapter for detailed versions. Cell Tx filter N7000 Tx IC PCS Tx filter Tx LO lock voltage Loop filter Figure 7: Transmitter schematic 1 ©2005 Nokia Corporation...
  • Page 14 6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care PCS duplexer PCS PA PCS PA Diplexer Couplers Component changes based on PA manufacturer Power detector Cell PA Cell duplexer Figure 8: Transmitter schematic 2 ©2005 Nokia Corporation Page 14 Company Confidential...

  • Page 15: Transmitter Troubleshooting Setup

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Transmitter Troubleshooting Setup Use the following sets of procedures to troubleshoot the transmitter using Phoenix. Due to the compact layout of the mobile terminal, some of the major test points are not accessible without destroying the shield frames and the EL lamp.
  • Page 16 6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care 5. Click the LOCAL button in the Phone State area to put the mobile terminal into Local Mode. Figure 9: Phone Control dialog box 6. Open the Troubleshooting menu, point to AMPS, and click AMPS Control.
  • Page 17 6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting 11. Configure the spectrum analyzer using the following values: • Center Frequency = 836.52 MHz • Span = 100 MHz • Amplitude = 20 dBm • Attenuation = Auto • BW = Auto...

  • Page 18: Cell Tx Setup

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Cell Tx Setup Use the following procedures to prepare for Cell Tx troubleshooting using Phoenix. 1. Connect an RF test connector to a call box. 2. Connect the mobile terminal to the PC via a test jig. (The bottom connector is a USB port.)

  • Page 19: I/6256/6256I (Rm

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting The CDMA Control dialog box appears. Do NOT select this option Figure 13: CDMA Control dialog box for Cell Tx troubleshooting 9. Select the following values: State = Rho ON •...

  • Page 20: Pcs Setup

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Figure 14: RF PDM Control dialog box for Cell band 12. Click Read Phone to update the values. PCS Setup Use the following procedures to prepare for PCS Tx troubleshooting using Phoenix.
  • Page 21 6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting 7. Select the following values on the RF Main Mode dialog box: Band = PCS (CDMA) • Channel = 600 • Mode = Rx/Tx • 8. Click Set. Note: Be sure that the “RF Main Mode set successfully” message appears in the status bar.

  • Page 22: Transmitter Rf Troubleshooting Procedures

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Figure 15: RF PDM Control dialog box for PCS band 14. Click Read Phone to update the values. Transmitter RF Troubleshooting Procedures After Phoenix is set up using either the AMPS, Cell, or PCS setup procedures, use the following steps to troubleshoot the transmitter.

  • Page 23: Failed Test: Tx Pa Detector

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting 4. Use an AAS-10 RF probe to probe the Cell Tx output of the N7000. • If there is no RF or low RF, look for SMD everywhere around the N7000.

  • Page 24: Tx Output Spectrum

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Tx Output Spectrum Following is the correct output of the mobile terminal on a spectrum analyzer with 100MHz span. Note that if you are using the AAS-10 probe with the mobile terminal connected to the call box, the amplitude should be approximately -7dBm at the antenna test point on the top of the PWB.

  • Page 25: Tx Dc Test Points - Bottom Side

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Tx DC Test Points - Bottom Side Following are the Tx DC test points located on the bottom side of the main PWB. Figure 18: Tx DC test points on the bottom side of the main PWB ©2005 Nokia Corporation...

  • Page 26: Tx Dc And Rf Test Points - Top Side

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Table 4 shows the values for the test points in Figure 18. Table 4: Tx DC Test Point Description and Values - Main PWB - Bottom Side Test Description Values Point Tx UHF LO Lock voltage: ~1.2V...
  • Page 27 6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Table 5 shows the values for the test points in Figure 19. Table 5: Tx DC Test Point Description and Values - Main PWB - Top Side Test Description Values Point Power detector input AMPS: -5dBm at 836.25MHz...

  • Page 28: Tx Rf Test Points - Bottom Side

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Tx RF Test Points - Bottom Side Figure 20 shows the Tx RF test points located on the bottom side of the main PWB. Figure 20: Tx DC and RF test points on the bottom side of the main PWB Table 6 shows the values for the test points in Figure 20.

  • Page 29: Rf Power Supply Dc Test Points - Bottom Side

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Table 6: Tx RF Test Point Descriptions and Values - Main PWB - Bottom Side (Continued) Test Description Values Point PCS PA out 11dBm RF out AMPS: +14dBm Cell: +20dBm PCS: +20dBm...
  • Page 30 6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Table 7 shows the values for the test points in Figure 21. Table 7: RF Power Supply DC Test Points (Main PWB - Bottom Side) Probe Description Value Point 1.8V VrefRF1 1.4V (Tx)

  • Page 31: Receiver Rf Troubleshooting

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Receiver RF Troubleshooting The heart of the receiver is the N7160 Rx IC, which contains two LNAs and mixers. The other components are passive. There are two RF SAW filters for the Cell and PCS bands.

  • Page 32: Receiver Block Diagram

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Receiver Block Diagram Following is the Rx system block diagram. Figure 22: Receiver system block diagram ©2005 Nokia Corporation Issue 2 05/2005 Company Confidential Page 32...

  • Page 33: Receiver Schematics

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Receiver Schematics The following schematics are for general reference only. See the Schematics chapter for detailed versions. Cell RF SAW filter N7160 Rx front-end IC PCS RF SAW filter AMPS IF crystal filter...
  • Page 34 6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Loop filter Rx LO lock voltage 1.2 to 1.7 Vdc N7100 Rx downconverter Figure 24: Receiver schematic - 2 ©2005 Nokia Corporation Page 34 Company Confidential Issue 2 05/2005...

  • Page 35: Rf Agc Status

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting RF AGC Status When configuring the values on the RF AGC Status dialog box, note the following: • The RF AGC status functionality only works in Call Mode. • In the PLL Lock Status area, bright green indicates a locked PLL and dark green indicates an unlocked PLL.

  • Page 36: Turning On The Rx Path

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Turning on the Rx Path Use the following steps to turn on the Rx path using Phoenix. 1. On the Phone Control dialog box, click the LOCAL button in the Phone State area to put the mobile terminal into Local Mode.

  • Page 37: Nokia Customer Care Rf Description And Troubleshooting

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Figure 27: RF Main Mode dialog box for AMPS (top), Cell (middle), and PCS (bottom) ©2005 Nokia Corporation Issue 2 05/2005 Company Confidential Page 37...

  • Page 38: Switching The Rx Gain States

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Switching the Rx Gain States Use the RF Gen I/O dialog box to switch the gain state (Hi and Lo) for CDMA and AMPS modes. High Gain State (default) Cell AMPS...

  • Page 39: Checking Cell Receiver From Rf To Iq

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Figure 29: Receiver IQ Level on AMPS band Figure 30 shows the AMPS spectrum and the test points located on the top side of the main PWB. All four test points should be approximately equal. WARNING: Direct current is present on these test points.
  • Page 40 6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care 3. Measure a 300kHz tone on the analyzer. You should see a typical -21dBm IQ tone for CDMA Cell. Cell I Q Output Trace A Trace A 302 kHz -21.2500 dBm...

  • Page 41: Checking Pcs Receiver From Rf To Iq

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Checking PCS Receiver from RF to IQ Use the following values to check the PCS receiver functionality from RF to IQ output. 1. Start Phoenix in Local Mode with only the Rx path turned on.

  • Page 42: Receiver Diagnostic Signal Tracing

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Rx_QP Rx_IP Rx_IN Rx_QN Figure 34: PCS spectrum and the test points on the top side of the main PWB Receiver Diagnostic Signal Tracing Use the following steps to trace the receiver signal.

  • Page 43: Receiver Dc Test Points

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Receiver DC Test Points Figure 35: Receiver DC troubleshooting test points on the bottom side of the main PWB Table 9 includes the descriptions and values for the Rx DC test points from Figure 35.

  • Page 44: Receiver Rf Test Points

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Receiver RF Test Points Figure 36: Rx RF test points on the bottom side of the main PWB Table 10 includes the descriptions and values for the Rx RF test points from Figure 36.

  • Page 45: Receiver If Test Points

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Table 10: Receiver RF Test Point Values (Continued) Test Description Value Point PCS channel 600 (to RF SAW) High gain: 1960MHz at -32dBm Low gain: 1960MHz at -49dBm IF MIX OUT (from N7160) High gain: 128.1MHz at -21dBm...

  • Page 46: Receiver Logic Input Voltages

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Table 11: Receiver IF Test Point Values (Continued) Test Description Value Point CDMA_IF_P (to the N7100) Cell high gain: -29dBm 128.1MHz Cell low gain: -45dBm PCS high gain: -29dBm PCS low gain: -45dBm...

  • Page 47: N7160 Receiver Overview

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Table 12 includes the measure logic levels for the N7160. Table 12: Rx Front-end (N7160) Logic Levels Logic Input Voltages Mode IF_SEL BAND GAIN_CTL AMPS High Gain 2.8 V 0.1 V 2.8 V...
  • Page 48 6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Cell Cell IFAs Buffer Figure 39: N7160 receiver There are two common explanations for an N7160 failure consisting of high current in Local Mode with just the Rx turned on: • No presence of an LO signal •...

  • Page 49: Synthesizer Troubleshooting

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Synthesizer Troubleshooting Faulty synthesizers can cause both Rx and Tx failures during tuning, in addition to the VCTCXO tuning. However, first check for the presence of various LO signals and their proper levels.

  • Page 50: Synthesizer Block Diagram

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Synthesizer Block Diagram Rx VHF LO 256.2MHz N7100 UHF LO N7160 1009.62MHz (Cell ch. 384) 2088.1MHz (PCS ch. 600) N7200 Tx UHF LO 3395.88MHz 3819.90MHz D2800 N7000 Figure 40: Synthesizer block diagram ©2005 Nokia Corporation...

  • Page 51: Synthesizer Schematics

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Synthesizer Schematics The following schematics are for general reference only. See the Schematics chapter for detailed versions. 19.2MHz buffer VCTCXO with Not installed AFC control UHF PLL IC Lock voltage Loop filter...

  • Page 52: Synthesizer Troubleshooting Setup

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Synthesizer Troubleshooting Setup Use the following steps to troubleshoot the synthesizer using Phoenix: 1. On the Phone Control dialog box, click the LOCAL button in the Phone State area to put the mobile terminal into Local Mode.

  • Page 53: Vctcxo Troubleshooting

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting VCTCXO Troubleshooting Without 19.2MHz, the mobile terminal does not power up. This signal goes to the N7100, N7000, D2800, and the UHF PLL. Check the test points in Figure 43 for the presence of the 19.2MHz signal.

  • Page 54: Vctcxo Manual Tuning

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Table 15: VCTCXO Test Point Output Values (Continued) Test Description Value Point If you do not see the VCTCXO signal at 2.8V test points 1-5, check the voltage at VR3 AFC voltage...

  • Page 55: Afc Voltage Troubleshooting

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting AFC Voltage Troubleshooting Use the following steps to monitor the AFC voltage. 1. In Phoenix, open the RF PDM dialog box. Figure 44: RF PDM dialog box for AFC troubleshooting Figure 45 shows a partial schematic of the R7205.

  • Page 56: Uhf Synthesizer

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Figure 46: Tx Output for AMPS channel 384, power level 5 UHF Synthesizer The UHF LO frequency varies with the channel and can be calculated using the Frequency Calculator dialog box in the Phoenix RF component. Use the following steps to troubleshoot the UHF LO frequency.

  • Page 57: Uhf Synthesizer Test Points

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting UHF Synthesizer Test Points N7100 Figure 47: UHF synthesizer layout Table 16 shows the description for each component in Figure 47. Table 16: UHF Synthesizer Layout Components Test Description Value Point...

  • Page 58: Rx Vhf Lo (N7100) Schematic

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Rx VHF LO (N7100) Schematic Following are the main layout components on a partial view of the Rx VHF schematic. See the Schematics chapter for detailed versions. Loop filter components Lock voltage...

  • Page 59: Rx Vhf Lo Troubleshooting

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Rx VHF LO Troubleshooting The VHF LO operates at a fixed frequency of 256.2MHz. It is the second LO for down- conversion to I and Q for baseband processing. Use the following steps to troubleshoot the VHF LO.

  • Page 60: Tx Uhf Lo (N7000) Schematic

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Tx UHF LO (N7000) Schematic The following partial schematic is for general reference only. See the Schematics chapter for complete detailed versions. Loop filter Lock voltage Figure 50: Tx UHF LO (N7000) schematic ©2005 Nokia Corporation...

  • Page 61: Tx Uhf Lo (N7000) Troubleshooting

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Tx UHF LO (N7000) Troubleshooting There are two fixed LOs, 3296.16~3395.88MHz for cell band and 3700~3819.90MHz for PCS band. This is the only LO for up-conversion. Be sure to monitor the control voltage at R7001.

  • Page 62: Gps Troubleshooting

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care GPS Troubleshooting GPS RF Block Diagram Figure 52: GPS block diagram ©2005 Nokia Corporation Page 62 Company Confidential Issue 2 05/2005...

  • Page 63: Gps Rf Schematic

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting GPS RF Schematic The following schematic is for general reference only. See the Schematics chapter for a detailed version. GPS RF chip GPS LNA GPS TCXO RF test input RF filter 2...

  • Page 64: Gps Troubleshooting Setup

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care GPS Troubleshooting Setup Use the following steps to set up GPS signal using Phoenix. 1. On the Phone Control dialog box, click the LOCAL button in the Phone State area to put the mobile terminal into Local Mode. (See Figure 9 on page 16 for an example of the Phone Control dialog box.)

  • Page 65: Self Test Failure

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting 5. In the Test Mode field, ensure that Galvanic is selected. 6. Click Execute. Self Test Failure If the test fails, repeat steps 1—6. If the test fails again, continue with the following self- test failure troubleshooting: 1.

  • Page 66: Gps Dc Test Points

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care 2. Click Execute. Figure 56: Turning on the GPS receiver on the GPS Control dialog box 3. Inject a -50dBm tone at 1575.52MHz at the GPS connector (X6250) with a signal generator or a call box.
  • Page 67 6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting GPS RF connector TOP SIDE GPS RF IC ceramic BOTTOM SIDE antenna Ceramic filter GPS BB IC GPS TCXO SAW filter Figure 57: GPS DC probe points on the bottom side (left) and top side (right) of the UI PWB ©2005 Nokia Corporation...
  • Page 68 6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Table 19 shows the values for the GPS DC test points in Figure 57. Table 19: GPS DC Test Point Values Test Description Value Point 1.8V VRF_GPS 2.8V LNA base 0.8V LNA Vcc 1.5V...

  • Page 69: Gps Rf Test Points

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting GPS RF Test Points GPS RF connector TOP SIDE ceramic BOTTOM SIDE antenna GPS RF IC Ceramic filter GPS BB IC GPS TCXO SAW filter Figure 58: GPS RF probe points on the top side of the UI PWB ©2005 Nokia Corporation...
  • Page 70 6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Table 20 shows the values for the GPS RF test points in Figure 58. All points are 1575.52MHz, except TCXO. Table 20: GPS RF Test Point Values Test Description Value Point GPS TCXO 16.368MHz = -19dBm...

  • Page 71: Fm Radio Troubleshooting

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting FM Radio Troubleshooting FM Radio Schematic The following schematic is for general reference only. See the Schematics chapter for a detailed version. Loop filter and VCO FM radio IC Audio output...

  • Page 72: Fm Radio Troubleshooting Setup

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care FM Radio Troubleshooting Setup Use the following steps to troubleshoot the FM radio while using a Pop-port headset. 1. Connect the Pop-port headset (HDS-3) to the Pop-port connector (bottom connector). 2. Select the Menu > Media > Radio from the mobile terminal user interface.
  • Page 73 6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting FM antenna matching components Figure 60: FM radio parts on the top side of the main PWB ©2005 Nokia Corporation Issue 2 05/2005 Company Confidential Page 73...
  • Page 74 6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care FM radio circuitry FM radio IC FM audio coupling caps Figure 61: FM radio parts on the bottom side of the main PWB ©2005 Nokia Corporation Page 74 Company Confidential Issue 2 05/2005...

  • Page 75: Bluetooth Troubleshooting

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Bluetooth Troubleshooting Bluetooth Schematic The following schematic is for general reference only. See the Schematics chapter for a detailed version. Bluetooth ASIC (N6000) SAW filter Bluetooth antenna strip Inverter Supply line filtering...

  • Page 76: Bluetooth Troubleshooting Setup

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Bluetooth Troubleshooting Setup Use the following steps to troubleshoot the BC02 Bluetooth Control component in Phoenix: 1. On the Bluetooth Control dialog box, select the Tests tab. 2. In the PRBS9 list, choose TX Data 1.

  • Page 77: Bluetooth Troubleshooting Flowchart

    6255/6255i/6256/6256i (RM-19) Nokia Customer Care RF Description and Troubleshooting Bluetooth Troubleshooting Flowchart Bluetooth Is the VREG_IN BT Replace the EXT external supply regulator. Is it OK? voltage 2.8V? Is the VIO bluetooth external supply Replace the R6002. voltage 1.8V? (Probe Is it OK? at the UEM side.)

  • Page 78: Bluetooth Dc And Rf Test Points

    6255/6255i/6256/6256i (RM-19) RF Description and Troubleshooting Nokia Customer Care Bluetooth DC and RF Test Points Figure 63 shows the bluetooth DC and RF test points on the bottom side of the main PWB. Digital inverter Voltage regulator Figure 63: Bluetooth DC and RF test points on the bottom side of the main PWB Table 23 shows the values associated with the bluetooth test points in Figure 63.

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