Nokia RH-77 Troubleshooting Manual

RF Description and Troubleshooting 2118 (RH-77) Issue 01 04/2005 ©2005 Nokia Corporation Company Confidential Page 17 Table 11: Detector Reference and DC Supply label Test Point Typical Value Det Ref left-C803 2 Det Supply bottom-C257 2.8 VDC ...

RF Description and Troubleshooting 2118 (RH-77) Issue 01 04/2005 ©2005 Nokia Corporation Company Confidential Page 17 Table 11: Detector Reference and DC Supply label Test Point Typical Value Det Ref left-C803 2 Det Supply bottom-C257 2.8 VDC ...

Nokia Customer Care Page 40 ©2005 Nokia Corporation Company Confidential Issue 01 04/2005 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. Tx VHF Following are possible causes for an incorrect Tx VHF frequency: • Power supplies to the PLL portion of N601IC missing or low (VR5) • Loop filter or resonator components are missing or incorrectly installed • 19.2MHz reference clock is ...

RF Description and Troubleshooting 2118 (RH-77) Issue 01 04/2005 ©2005 Nokia Corporation Company Confidential Page 11 Figure 9 shows each testing point for the PA section from Table 1, “Cell Transmitter Test Points,” on page 8. Always attach a 20 dB pad (11881-60001) when probing with an HP85024A high frequency probe. Figure 9: (Top) PWB. (Bottom left) A zoomed view of the testing points on the PA section. (Bottom right) A zoomed view of the PA section with part numbers. Tx AGC Tuning Tx power versus IF/RF PDM can be verified against FlaLi specification limits. Mak ...

Nokia Customer Care Page 28 ©2005 Nokia Corporation Company Confidential Issue 01 04/2005 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 PDM Typical Value Test Point -512 0.08 right R702 -400 0.260 -300 0.436 -200 0.597 -100 0.753 0 0.913 100 1.076 200 1.24 300 1.403 350 1.494 400 1.570 500 1.740 511 1.761 UNITS VDC Table 16: Rx AGC vs. RF Pin for CELL Band Conn RF Pin CELL RF AGC Comments -25 1.492 -35 1.298 - ...

RF Description and Troubleshooting 2118 (RH-77) Issue 01 04/2005 ©2005 Nokia Corporation Company Confidential Page 23 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 22. All test points and values are the same. Figure 14: Alternate part orientation with pin 1 rotated 180 degrees ...

RF Description and Troubleshooting 2118 (RH-77) Issue 01 04/2005 ©2005 Nokia Corporation Company Confidential Page 39 Figure 30: (Top) PWB. (Bottom left) A zoomed view of the N601 LO/PLL input match components on the UHF synthesizer layout (Bottom right) A zoomed view of the N601 LO/PLL input match components UHF synthesizer layout with part numbers. Rx VHF Following are possible causes for an incorrect Rx VHF frequency: • Power supplies to the PLL portion of N700 IC are missing or low (VR7) • Loop filter or resonator components are missing or incorrectly installed ...