250 Keysight N9010A EXA Service GuideFront End Control TroubleshootingA15 Front End Control Assembly TroubleshootingPreselector Tune OutputThe Presel Tune connector A15J300 (FEC) or A15J302 (EFEC, EFEC-Lite,S-EFEC) is a test point used to verify the internal A12, YIG Tuned Filter drivevoltage variations with center frequency. The YTF is used in the high band path(3.6 GHz to the analyzer’s maximum frequency). Connect Presel Tune to avoltmeter. Use the MMCX (m) to SMB (f) to connect to Presel Tune on the A15board and appropriate adapters to connect to the voltmeter. Refer to Figure6-1 or Figure 6-2 or Presel Tune location. You may also need a Banana plug toBNC (f) adapter, part number E9637A for the Voltmeter. The preselector tuneoutput voltage can be measured to verify this portion of the A15 is functioning.Press System, Alignments, Auto Align, Off on the analyzer once it has fullybooted to the spectrum analyzer application. Press Span, Zero Span on theanalyzer. The preselector tune output voltage in high band should changewhen the center frequency of the analyzer is changed.Preselector tune output measurements are not valid for Option 503, 3 GHz frequency range.Table 6-11 Preselector Tune Output VoltagesCenter Frequency(GHz)~ Tune Vol tage(VDC)Valid FrequencyRange Option5.0 1.6 507, 513, 52610.0 3.3 513, 52615.0 4.85 52620.0 6.5 52626.0 8.45 526Table 6-12 Preselector Tune Output Voltages (Option 532, 550)Center Frequency(GHz)~ Tune Vol tage(VDC)Valid FrequencyRange Option5.0 0.9 532, 54410.0 1.8 532, 54415.0 2.7 532, 54420.0 3.6 532, 54425.0 4.6 532, 54430.0 5.5 532, 54440.0 7.3 544
