Nokia Customer Care 2115i/2116/2116i (RH-66) Mobile Terminals RF Description and Troubleshooting Issue 1 03/2005 Company Confidential ©2005 Nokia Corporation
115i/2116/2116i (RH-66) RF Description and Troubleshooting Contents Page Component Layouts ....................................................................................................................................... 3 Phoenix Setup.................................................................................................................................................. 5 Tx Troubleshooting ..................................................................................................
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care Component Layouts Figure 1 and Figure 2 show the main components of the 2115i/2116/2116i.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Cell Rx SAW filter Diplexer N7160 Rx front-end IC PCS Rx SAW Cell duplexer PCS duplexer GPS RF filter (1) Cell PA AMPS IF XTal filter PCS PA GPS LNA GPS RF connector CDMA IF SAW filter Cell Tx filter VCO N7100 Rx downconverter PCS Tx filter GPS RF filter (2) Tx upconverter Synthesizer IC GPS TCXO VCTCXO Figure 2: Component layout (bottom) Page 4 ©2005 Nokia Corporation Company Confidential Issue 1 03/2005
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care Phoenix Setup Use the following steps to configure Phoenix for RF troubleshooting. 1. Connect RF test connector to a call box. 2. Connect the mobile terminal to a PC via the bottom connector, and connect a power supply. 3. Open the Troubleshooting menu, and click Phone Control. The Phone Control dialog box appears. 4.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care Table 1: Phoenix Configuration Cell PCS AMPS 1. On the RF Main Mode dialog box: • Band = Cell (CDMA) • Channel = 384 • Mode = Rx/Tx 2. Click Set. Be sure that the “RF Main Mode set successfully” message appears in the status bar. 3. On the CDMA Control dialog box: • State = Rho ON • Band = Cell • Radio Configuration = Mode 1: IS-95 Voice • Select the Set default PDM values check box. 4. Click Execute. 5.
2115i/2116/2116i (RH-66) Nokia Customer Care RF Description and Troubleshooting Tx Troubleshooting Main Tx Components PCS TX SAW filter N7000 TX IC PCS PA Cell TX SAW filter Cell PA PCS duplexer PCS coupler Cell duplexer Power detector Cell coupler Figure 4: Tx components Issue 1 03/2005 ©2005 Nokia Corporation Company Confidential Page 7
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care Cell Transmitter Block Diagram Figure 5: Tx system block diagram Page 8 ©2005 Nokia Corporation Company Confidential Issue 1 03/2005
2115i/2116/2116i (RH-66) Nokia Customer Care RF Description and Troubleshooting Tx DC Test Points VBATT PCS 7 8 3 4 5 1 2 6 VBATT Cell Figure 6: Tx DC test points Issue 1 03/2005 ©2005 Nokia Corporation Company Confidential Page 9
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Table 2 shows the Tx DC test points shown in Figure 6. Table 2: Tx DC Test Points Page 10 Test Point Description Value 1 AGC 1 From 0.1 to 1.8 V 2 AGC 2 From 0.1 to 1.8 V 3 VR6 2.8 V 4 Tx UHF LO lock voltage 1.2 V 5 VR1B 4.8 V 6 Tx IQ in 1.2 V With oscilloscope: 500 mV p-p 7 VR2 (power detector) 2.76 V 8 Power detector output PCS: • 1.9 V at < 5 dBm • 1.6 V at 15 dBm • 0.8 V at 25 dBm Cell: • 1.9 V at < 5 dBm • 1.
2115i/2116/2116i (RH-66) Nokia Customer Care RF Description and Troubleshooting Tx RF Test Points 12 8 5 4 10 9 6 11 7 1 2 3 Figure 7: Tx RF Test Points Issue 1 03/2005 ©2005 Nokia Corporation Company Confidential Page 11
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Table 3 shows the test points shown in Figure 7. Table 3: Tx RF Test Points Page 12 Test Point Description Value 1 Tx IQ in with oscilloscope 500 mV p-p with +1.2 V offset 2 Tx UHF LO Cell: 3346.08 MHz, -57 dBm PCS: 3760 MHz, -54 dBm 3 Cell/AMPS N7000 out Cell: 836.25 MHz, -15 dBm AMPS: 836.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care TX DC Test Points 1 2 3 5 4 7 6 9 8 10 Figure 8: Bottom side Tx DC test points Table 4 shows the Tx DC test points shown in Figure 8. Table 4: Tx DC Test Points and RF Supply Line Resistance to Ground Test Point Description Value RF Supply Lines Resistance to Ground* 1 VIO 1.8 V >1MΩ to ground N7100, N7000, UHF PLL 2 VR3 2.78 V (synthesizer) >500kΩ to ground VCTCXO 3 VR7 2.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Table 4: Tx DC Test Points and RF Supply Line Resistance to Ground (Continued) Test Point Description Value RF Supply Lines Resistance to Ground* 9 VR1A 4.75 V (synthesizer) >100kΩ to ground UHF PLL 10 VBATT From 3.2 to 4.7 V 45kΩ to ground N7100 VREFRF1 * Note: Always measure resistance with the phone powered off.
2115i/2116/2116i (RH-66) Nokia Customer Care RF Description and Troubleshooting Receiver Troubleshooting Rx System Block Diagram Figure 9: Rx RF system diagram Issue 1 03/2005 ©2005 Nokia Corporation Company Confidential Page 15
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Cell Receiver Check from RF to IQ Use the following values to check the CDMA Cell Rx functionality from RF to IQ output. 1. Start Phoenix in Local Mode with only the Rx path turned on. 2. Inject a –75 dBm CW signal of 881.82 MHz (i.e. 300 kHz offset from 881.52 MHz or 10 channels away). 3. Measure a 300 kHz tuning on the analyzer. You should see a typical -21 dBm IQ tuning for CDMA Cell. Cell I Q Output Trace A dBm 1 0 -10 Trace A 302 kHz -21.
Nokia Customer Care 2115i/2116/2116i (RH-66) RF Description and Troubleshooting RX_QN RX_IP RX_IN RX_QP Figure 11: Cell spectrum (left) and IQ output test points (right) PCS Receiver Check 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. 2. Inject a –75 dBm CW signal of 1960.5 MHz (i.e. 500 kHz offset from 1960 MHz or 10 channels away). 3. Measure a 500 kHz tuning on the analyzer.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting PCS I Q Output Trace A dBm 2 0 -10 Trace A 503 kHz -22.4500 dBm 2 -20 -30 -40 -50 -60 -70 -80 -90 -100 Centre: 500 kHz Res BW: 3 kHz 5/5/2004 3:37:55 PM Atten: 10 dB Vid BW: 3 kHz PcsIQ.spt Span: 200 kHz Sweep: 100 ms HP8595E Figure 12: Receiver IQ Level on PCS Band Figure 13 shows the PCS spectrum with an inject tone at -75 dBm, as well as the IQ output test points.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care AMPS Receiver Check from RF to IQ Use the following steps to check the AMPS receiver functionality from RF to IQ output. 1. Start Phoenix in Local Mode with only the Rx path turned on. 2. Inject a –75 dBm CW signal of 881.53 MHz (i.e., 10 kHz offset from 881.52 MHz) into the RF. 3. Measure a 10 kHz tone on the analyzer. You should see a typical -20 dBm IQ tone for AMPS.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting RX_QN RX_IP RX_IN RX_QP Figure 15: AMPS spectrum (left) and IQ output test points (right) Page 20 ©2005 Nokia Corporation Company Confidential Issue 1 03/2005
15i/2116/2116i (RH-66) Nokia Customer Care RF Description and Troubleshooting Receiver DC Test Points 7 Cell RF SAW filter 3 AMPS IF Xtal filter 6 5 2 CDMA IF SAW filter 1 4 PCS RF SAW filter Figure 16: Rx DC troubleshooting test points Issue 1 03/2005 ©2005 Nokia Corporation Company Confidential Page 21
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Table 5 includes the descriptions and values for Rx DC troubleshooting test points shown in Figure 16. Table 5: Rx DC Test Points Test Point Description Value 1 LO Vdd 2.6 VDC LO Amp Vdd supply lines for Cell and PCS 2 RFA Vdd 2.8 VDC RF Amp Vdd supply line for Cell band 3 C_LNA Vdd 2.8 VDC External Vdd supply line for Cell LNA 4 P_LNA Vdd 2.8 VDC External Vdd supply line for PCS LNA 5 IFA Vdd 2.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care 3 7 Cell RF SAW filter 6 2 1 5 4 PCS RF SAW filter Figure 17: Receiver RF troubleshooting test points Table 6 includes the descriptions and values for Rx RF troubleshooting test points shown in Figure 17. Table 6: Rx RF Troubleshooting Values Test Point Description Value 1 PCS_CEL_LO (from VCO) Cell: 1009.62MHz at -8 dBm PCS: 2088.1MHz at -14 dBm 2 Cell CH384 (from duplexer) 881.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Table 6: Rx RF Troubleshooting Values (Continued) Page 24 Test Point Description Value 6 IF MIX OUT (from N7160) High gain: 128.1MHz at -20 dBm Low gain: 128.1MHz at -37 dBm 7 IFA_in (to N7160) High gain: 128.1MHz @ -15 dBm Low gain: 128.
2115i/2116/2116i (RH-66) Nokia Customer Care RF Description and Troubleshooting Receiver IF Test Points 4 5 7 Cell RF SAW filter AMPS IF Xtal filter 1 6 CDMA IF SAW filter 2 PCS RF SAW filter 3 Figure 18: Rx IF troubleshooting test points Issue 1 03/2005 ©2005 Nokia Corporation Company Confidential Page 25
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Table 7 includes the descriptions and values for Rx IF troubleshooting test points shown in Figure 18. Table 7: Rx IF Troubleshooting Values Page 26 Test Point Description Value 1 CDMA IF (to SAW)128.1 MHz Cell channel 384: • High gain: -6 dBm • Low gain: -23 dBm PCS channel 600: • High gain: -6 dBm • Low gain: -20 dBm 2 CDMA_IF_P (to N7100)128.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care Receiver Logic Input Voltages Following are the measure logic levels for the Rx front end (N7160). 1 2 3 Figure 19: Rx logic input voltages Table 8 includes the logic level values for the Rx front end. Table 8: Rx Front-end Logic Levels Logic Input Voltages Mode 1 IF_SEL 2 BAND 3 GAIN_CTL Cell CDMA high gain 0V 0.1 V 2.75 V Cell CDMA low gain 0V 0.1 V 0V PCS CDMA high gain 0V 2.68 V 2.
2115i/2116/2116i (RH-66) 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. The 19.2 MHz reference clock is needed for the mobile terminal to power up. Therefore, if everything fails, check for the presence of 19.2 MHz. The level of 19.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care Synthesizer Block Diagram 3 2 4 1 Figure 20: Synthesizer block diagram Table 9 includes the component values shown in Figure 20. Table 9: Synthesizer Block Diagram Component Values Issue 1 03/2005 Item Description Value 1 VCTCXO 19.2 MHz 2 UHF LO 1009.62 MHz (Cell channel 384) 2088.1 MHz (PCS channel 600) 3 Rx VHF LO 256.2 MHz 4 Tx UHF LO 3395.88 MHz 3819.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting 19.2 MHZ VCTCXO Reference Clock The VCTCXO frequency is a 19.2 MHz reference signal. Without 19.2 MHz, the mobile terminal does not power up. This signal goes to N7100, N7000, UHF PLL, and the UPP.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care 2. Open the RF PDM dialog box component in RF. Figure 22: RF PDM dialog box for AFC measurement Typical voltages observed are as follows: • AFC PDM[0] = 1.3 V • AFC PDM[-1024] = 0.8 V • AFC PDM[1023] = 2.5 V VCTCXO Manual Tuning You can manually tune the VCTCXO to verify when a mobile terminal is tuned incorrectly or if the mobile terminal cannot make a call.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Use the following steps to set up a CW signal: 1. On the Phone Control dialog box, click the LOCAL button in the Phone State area to put the mobile terminal into Local Mode. Figure 23: Phone Control dialog box 2. Click the Execute button. 3. Open the Troubleshooting menu, point to AMPS, and click AMPS Control. The AMPS Control dialog box appears. 4.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care 7. Use RF PDM to adjust the AFC to center the VCTCXO. The tuning range is approximately +/- 10kHz. Adjust the AFC so that the output signal is within +/-150Hz. If using the spectrum analyzer, narrow the span to 1 kHz or less. Adjust AFC to center VCTCXO manually Figure 24: RF PDM dialog box 8. If the VCTCXO does not tune, replace the UEMC.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Figure 26: Tx output for PCS channel 600 at 25C Page 34 ©2005 Nokia Corporation Company Confidential Issue 1 03/2005
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care VCTCXO Test Points 7 5 6 1 2 3 4 Figure 27: VCTCXO test points Issue 1 03/2005 ©2005 Nokia Corporation Company Confidential Page 35
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Table 10 shows the values and description for the VCTCXO test points in Figure 27. Table 10: VCTCXO Test Point Values and Descriptions Test Point Description 1 CLK19M2_UPP to UPP 2 CLK19M2_GPS to GPS module 3 VR3: 2.8 V 4 AFC voltage: DC between 1 and 3 V: • 1.3 V for PDM 0 • 0.8 V for PDM -1024 • 2.
Nokia Customer Care 2115i/2116/2116i (RH-66) RF Description and Troubleshooting The Frequency Calculator dialog box appears. Figure 28: Frequency Calculator dialog box for Cell (top) and PCS (bottom) 2. Check to see if the LO is locked. Set a channel and check the output of the UHF LO at L502 within a very narrow span of 100 KHz. The LO should be virtually immobile. 3. Measure for nominal UHF LO signal levels using an RF probe. 4.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting . 1 2 3 4 6 5 7 Figure 29: UHF synthesizer test points Table 11 shows the values and description for the UHF synthesizer test points in Figure 29. Table 11: UHF Synthesizer Test Point Values and Descriptions Page 38 Test Point Description Values 1 VR4 2.8 V 2 VPLL 2.8 V 3 VR1A 4.
Nokia Customer Care 2115i/2116/2116i (RH-66) RF Description and Troubleshooting Table 11: UHF Synthesizer Test Point Values and Descriptions (Continued) Test Point Description Values 4 Lock voltage DC between 0.8 and 3.4 V, S/B 1.2 V at center frequency 5 BAND_SEL_VCO Cell = 0 VDC PCS = 2.8 VDC 6 UHF LO: PCS_CEL_LO return to N7160 PCS_CEL_LO return to UHF PLL Cell: -11 dBm PCS: -18 dBm 7 Cell channel 384: 1009.62 MHz > -9 dBm PCS channel 600: 2088.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care Rx VHF LO (N7100) Schematic The following partial schematic is for general reference only. See the Schematics chapter for a detailed version.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care Figure 31 shows the Rx VHF LO test points. 2 1 3 Figure 31: Rx VHF LO test points Table 12 gives the description and values for the test points as shown in Figure 31. Table 12: Rx VHF LO Test Points Test Point Description Value 1 RX LO lock voltage 1.2 to 1.7 VDC 2 VR7 2.8V 3 VR5 2.8V Tx UHF LO There are two fixed LOs: 3296.16~3395.88 MHz for Cell band and 3700~3819.90 MHz for PCS band.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care TX UHF LO Schematic The following partial schematic is for general reference only. See the Schematics chapter for a detailed version.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care Figure 33 shows the Tx UHF LO test points. 4 2 1 3 Figure 33: Tx UHF LO (N7000) test points Table 13 gives the description and values for the test points as shown in Figure 33. Table 13: Tx UHF LO Test Points Test Point Description Value 1 VCC_VCO 2.3 V 2 Lock voltage DC between 1.2 and 1.8 V 3 Measure frequency by probing the top of the chip PCS: 3760 MHz (channel 600) -54 dBm Cell: 3346.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care GPS RF Troubleshooting Following is the GPS RF block diagram.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Nokia Customer Care GPS RF General Testing In radiated testing the CW level has to be higher because of the attenuation in pad + cable + coupler. With a -20 dB pad, the signal level in the signal generator is ~ -110 dBm + cable attenuation + 20 dB + 18 dB. The CW analysis allows end-to-end spectral purity to be assessed during manufacturing and development. 1.
2115i/2116/2116i (RH-66) RF Description and Troubleshooting 3. Open the Troubleshooting menu, and click GPS Control. The GPS Control dialog box appears. Figure 37: GPS Control dialog box 4. Select GPS Quick Test in the Function area, and ensure that the Test Mode area shows a value of Galvanic. 5. Click Execute. Self-test Failure If the test fails, repeat steps 1—5 in the "GPS RF General Testing" section. If the test fails again, continue with the following self-test failure troubleshooting: 1.
2115i/2116/2116i (RH-66) Nokia Customer Care RF Description and Troubleshooting 4 3 5 1 2 Figure 38: GPS test points Issue 1 03/2005 ©2005 Nokia Corporation Company Confidential Page 47
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Table 14 gives the description and values for the test points as shown in Figure 38. Table 14: GPS Test and DC Test Point Values Test Point Description Value (V) 1 VDD_IO_GPS 1.8 2 TCXO Vcc 2.8 3 LNA Vcc 1.5 4 LNA_Base 0.8 5 VRF_GPS 2.8 GPS RF Test Points Use the following steps for RF testing: 1. Open the Troubleshooting menu, and click GPS Control. The GPS Control dialog box appears. Figure 39: GPS Control dialog box 2.
2115i/2116/2116i (RH-66) Nokia Customer Care RF Description and Troubleshooting 3 2 4 1 7 6 5 Figure 40: GPS RF test points Issue 1 03/2005 ©2005 Nokia Corporation Company Confidential Page 49
2115i/2116/2116i (RH-66) RF Description and Troubleshooting Table 15 includes the values for the test points in Figure 40. Table 15: GPS RF Test Point Values Page 50 Test Point Description Values (dBm) 1 1st RF filter in -62 2 1st RF filter out -65 3 GPS LNA in -63 4 GPS LNA out -45 5 2nd RF filter in -46 6 2nd RF filter out -46 7 GPS TCXO out (16.
