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Nokia Customer Care
3155/3155i (RM-41), 3152 (RM-61)
Mobile Terminal
RF Description and
Troubleshooting
©2005 Nokia Corporation
ISSUE 1 07/2005
Company Confidential

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Troubleshooting

   Also See for Nokia 3155

   Summary of Contents for Nokia 3155

  • Page 1: Troubleshooting

    Nokia Customer Care 3155/3155i (RM-41), 3152 (RM-61) Mobile Terminal RF Description and Troubleshooting ©2005 Nokia Corporation ISSUE 1 07/2005 Company Confidential...

  • Page 2: Table Of Contents

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting Contents Page Mobile Terminal Components ........................5 Main PWB ..............................5 Preliminary RF Troubleshooting........................8 Mobile Terminal Cannot Make a Call ....................8 Tx Power Low ..............................8 Transmitter RF Troubleshooting ......................... 9 Transmitter Block Diagram ........................10...

  • Page 3

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting GPS RF Block Diagram ..........................58 GPS RF Schematic .............................59 GPS Troubleshooting Setup ........................60 Self Test Failure ............................61 Oscillator Failure............................ 61 CW Test Failure............................61 GPS RF Troubleshooting........................61 GPS DC Test Points ..........................

  • Page 4

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting This page intentionally left blank. ©2005 Nokia Corporation Page 4 Company Confidential ISSUE 1 07/2005...

  • Page 5: Mobile Terminal Components

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting 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. FM Radio...

  • Page 6

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting Cell duplexer Diplexer Rx RF Cell filter N7160: Rx front-end Antenna connector Rx RF PCS filter PCS duplexer Cell PA Headset jack PCS PA Rx IF AMPS filter Cell Tx filter Rx IF CDMA filter...

  • Page 7

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting GPS ceramic antenna GPS 16.368 MHz TCXO GPS antenna connector GPS BB IC GPS RF IC Figure 3: UI PWB component layout - bottom ©2005 Nokia Corporation ISSUE 1 07/2005...

  • Page 8: Preliminary Rf Troubleshooting

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting 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. The mobile terminal is in Normal Mode (i.e., the mobile terminal is searching for a signal, net server is on).

  • Page 9: Transmitter Rf Troubleshooting

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting Transmitter RF Troubleshooting Following are the main Tx RF components. Cell Tx SAW filter PCS Tx SAW filter Antenna Connector TX IQ in ~ 1.2V PCS PA Cell PA...

  • Page 10: Transmitter Block Diagram

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting Transmitter Block Diagram Following is the block diagram for the Tx RF system. 19.2 MHz TiKu GENIO N7000 Tx IC VccPa PwrOut Antenna Vbat Div 4 Div 2 Iref Phone test Cell Duplexer...

  • Page 11: Transmitter Schematics

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting 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...

  • Page 12

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting Nokia Customer Care PCS PA PCS duplexer Diplexer Power detector Couplers Cell PA Cell duplexer DC-DC Figure 7: Transmitter schematic 2 ©2005 Nokia Corporation Page 12 Company Confidential ISSUE 1 07/2005...

  • Page 13: Transmitter Troubleshooting Setup

    3155/3155i (RM-41), 3152 (RM-61) 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 14

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting 5. Click the LOCAL button in the Phone State area to put the mobile terminal into Local Mode. Figure 8: Phone Control dialog box 6. Open the Troubleshooting menu, point to AMPS, and click AMPS Control.

  • Page 15

    3155/3155i (RM-41), 3152 (RM-61) 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 = 30 dBm • Attenuation = Auto •...

  • Page 16: Cell Tx Setup

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting 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.

  • Page 17

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting The CDMA Control dialog box appears. Do NOT select this option Figure 12: CDMA Control dialog box for Cell Tx troubleshooting 9. Select the following values: State = Rho ON •...

  • Page 18: Pcs Setup

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting Figure 13: 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 19

    3155/3155i (RM-41), 3152 (RM-61) 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 20: Transmitter Rf Troubleshooting Procedures

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting Figure 14: 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 21: Failed Test: Tx Pa Detector

    3155/3155i (RM-41), 3152 (RM-61) 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 22: Tx Output Spectrum

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting 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 23: Tx Dc Test Points - Bottom Side

    3155/3155i (RM-41), 3152 (RM-61) 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 17: Tx DC test points on the bottom side of the main PWB...

  • Page 24: Tx Rf Test Points - Bottom Side

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting Table 4: Tx DC Test Point Description and Values - Main PWB - Bottom Side (Continued) Test Description Values Point AGC1 0.1V to 1.8V 2.8V 2.8V VR1B 4.8V Tx RF Test Points - Bottom Side Figure 18 shows the Tx RF test points located on the bottom side of the main PWB.

  • Page 25: Rf Power Supply Dc Test Points - Bottom Side

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting Table 5: Tx RF Test Point Descriptions and Values - Main PWB - Bottom Side (Continued) Test Description Values Point RF out AMPS: +24dBm Cell: -13dBm PCS: -23dBm Tx UHF LO Cell: 3346.08MHz -52dBm...

  • Page 26

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting Table 6: RF Power Supply DC Test Points (Main PWB - Bottom Side) (Continued) Probe Description Value Point 2.8V (Synthesizer) 2.8V (Rx) 2.8V (Rx) VR1B 4.7V (Tx) 2.8V (Rx) 2.8V (Tx) 2.8V (Tx) VR1A 4.7V (Synthesizer)

  • Page 27: Receiver Rf Troubleshooting

    3155/3155i (RM-41), 3152 (RM-61) 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 28: Receiver Block Diagram

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting Nokia Customer Care Receiver Block Diagram Following is the Rx system block diagram. Figure 20: Receiver system block diagram ©2005 Nokia Corporation Page 28 Company Confidential ISSUE 1 07/2005...

  • Page 29: Receiver Schematics

    3155/3155i (RM-41), 3152 (RM-61) 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...

  • Page 30

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting Nokia Customer Care Loop filter Rx LO lock voltage 1.2 to 1.7 Vdc N7100 Rx downconverter Figure 22: Receiver schematic - 2 ©2005 Nokia Corporation Page 30 Company Confidential ISSUE 1 07/2005...

  • Page 31: Rf Agc Status

    3155/3155i (RM-41), 3152 (RM-61) 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 32: Turning On The Rx Path

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting 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 33

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting Figure 25: RF Main Mode dialog box for AMPS (top), Cell (middle), and PCS (bottom) ©2005 Nokia Corporation ISSUE 1 07/2005 Company Confidential Page 33...

  • Page 34: Switching The Rx Gain States

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting 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 Low Gain State...

  • Page 35: Checking Cell Receiver From Rf To Iq

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting Trace A Trace A 11 kHz 11 kHz -25 dBm -25 dBm Figure 27: Receiver IQ Level on AMPS band Figure 28 shows the AMPS spectrum and the test points located on the top side of the main PWB.

  • Page 36

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting 3. Measure a 300kHz tone on the analyzer. You should see a typical -5dBm IQ tone for CDMA Cell. Trace A Trace A 503 kHz 503 kHz 5 dBm 5 dBm Figure 29: Receiver IQ level on Cell band...

  • Page 37: Checking Pcs Receiver From Rf To Iq

    3155/3155i (RM-41), 3152 (RM-61) 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 38: Receiver Diagnostic Signal Tracing

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting Figure 32: 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. 1. Inject an external signal source of –25dBm to the RF input. An Agilent call box 8960 is recommended.

  • Page 39: Receiver Dc Test Points

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting Receiver DC Test Points Figure 33: Receiver DC troubleshooting test points on the bottom side of the main PWB Table 8 includes the descriptions and values for the Rx DC test points from...

  • Page 40: Receiver Rf Test Points

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting Receiver RF Test Points Figure 34: Rx RF test points on the bottom side of the main PWB Table 9 includes the descriptions and values for the Rx RF test points from...

  • Page 41: Receiver If Test Points

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting Receiver IF Test Points Figure 35: Receiver IF test points on the bottom side of the main PWB Table 10 includes the descriptions and values for Rx IF test points from...

  • Page 42: Receiver Logic Input Voltages

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting Receiver Logic Input Voltages Figure 36 shows the receiver logic input voltages. Figure 36: Receiver logic input voltage test points Table 11 includes the measure logic levels for the N7160. Table 11: Rx Front-end (N7160) Logic Levels...

  • Page 43: N7160 Receiver Overview

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting N7160 Receiver Overview Keep the following points in mind regarding the N7160 receiver: • There is a separate LNA for 800MHz (Cell and AMPS) and 1900MHz (PCS). • There is a separate RFA (inside N7160) for 800MHz (Cell and AMPS) and 1900MHz (PCS).

  • Page 44

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting Cell Cell IFAs Buffer Figure 37: 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 45: Synthesizer Troubleshooting

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting Synthesizer Troubleshooting Faulty synthesizers can cause 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 46: Synthesizer Block Diagram

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting 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 38: Synthesizer block diagram ©2005 Nokia Corporation...

  • Page 47: Synthesizer Schematics

    3155/3155i (RM-41), 3152 (RM-61) 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...

  • Page 48: Synthesizer Troubleshooting Setup

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting 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 49

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting for the presence of the 19.2MHz signal. VCTCXO Figure 41: VCTCXO test point output values Table 14 includes the descriptions and values for VCTCXO test points from Figure Table 14: VCTCXO Test Point Output Values...

  • Page 50: Vctcxo Manual Tuning

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting VCTCXO Manual Tuning The VCTCXO can be manually tuned to verify when a mobile terminal is tuned incorrectly or if mobile terminal cannot make a call. Monitor the RF signal at the mobile terminal’s output.

  • Page 51: Afc Voltage Troubleshooting

    3155/3155i (RM-41), 3152 (RM-61) 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 42: RF PDM dialog box for AFC troubleshooting Figure 43 shows a partial schematic of the R7205.

  • Page 52: Uhf Synthesizer

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting Figure 44: 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 53: Uhf Synthesizer Test Points

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting UHF Synthesizer Test Points N7100 Figure 45: UHF synthesizer layout Table 15 shows the description for each component in Figure Table 15: UHF Synthesizer Layout Components Test Description Value...

  • Page 54: Rx Vhf Lo (n7100) Schematic

    3155/3155i (RM-41), 3152 (RM-61) 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...

  • Page 55: Rx Vhf Lo Troubleshooting

    3155/3155i (RM-41), 3152 (RM-61) 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 56: Tx Uhf Lo (n7000) Schematic

    3155/3155i (RM-41), 3152 (RM-61) 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 48: Tx UHF LO (N7000) schematic ©2005 Nokia Corporation...

  • Page 57: Tx Uhf Lo (n7000) Troubleshooting

    3155/3155i (RM-41), 3152 (RM-61) 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 58: Gps Troubleshooting

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting Nokia Customer Care GPS Troubleshooting GPS RF Block Diagram Figure 50: GPS block diagram ©2005 Nokia Corporation Page 58 Company Confidential ISSUE 1 07/2005...

  • Page 59: Gps Rf Schematic

    3155/3155i (RM-41), 3152 (RM-61) 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 LNA GPS RF chip GPS TCXO RF test input...

  • Page 60: Gps Troubleshooting Setup

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting 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...

  • Page 61: Self Test Failure

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting 5. In the Test Mode field, ensure that BB/Hdw 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 62: Gps Dc Test Points

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting 2. Click Execute. Figure 54: 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. (See Figure 52.)

  • Page 63

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting GPS RF IC GPS BB IC Figure 55: GPS DC probe points on the top side of the UI PWB Table 18 shows the values for the GPS DC test points in...

  • Page 64: Gps Rf Test Points

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting GPS RF Test Points GPS RF IC GPS BB IC Figure 56: GPS RF probe points on the top side of the UI PWB Table 19 shows the values for the GPS RF test points in Figure 56.

  • Page 65: Fm Radio Troubleshooting

    3155/3155i (RM-41), 3152 (RM-61) 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 Audio output FM antenna...

  • Page 66: Fm Radio Troubleshooting Setup

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting 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 67

    3155/3155i (RM-41), 3152 (RM-61) Nokia Customer Care RF Description and Troubleshooting FM audio coupling caps FM Radio circuitry FM Radio IC N6100 Figure 58: FM radio test points on the top side of the main PWB ©2005 Nokia Corporation ISSUE 1 07/2005...

  • Page 68

    3155/3155i (RM-41), 3152 (RM-61) RF Description and Troubleshooting Nokia Customer Care This page intentionally left blank. ©2005 Nokia Corporation Page 68 Company Confidential ISSUE 1 07/2005...

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