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...
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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...
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).
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...
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...
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...
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.
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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.
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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 •...
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.
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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 •...
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.
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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.
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.
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.
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.
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...
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.
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...
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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)
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.
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...
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.
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.
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...
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.
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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...
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.
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.
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...
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...
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...
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).
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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 •...
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.
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...
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.
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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...
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.
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.
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.
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...
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...
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.
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.
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...
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...
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.
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.)
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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...
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.
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...
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.