Keysight Technologies X Series Service Manual page 227

RF Section Troubleshooting (Millimeter-Wave Analyzers)
Troubleshooting
To perform the YTF alignment, reconnect W46 or W7 cable, and press System,
Alignments, More, Ad vanced, Characterize Preselector. The routine may take
several minutes to align the YTF. Display the 4.8 GHz calibrator signal on
screen as explained in the quick check section. If the signal level is still
incorrect, suspect all assemblies, cables, switches and the A15 Reference
calibrator signal between the W46/W7 cable and the input to the A9
Attenuator.
If Option MPB is not present, remove A10 Input Attenuator B output cable and
measure the output power. Expected signal is 4.8 GHz −38 dBm. See
5-11
suspect the A11 Low Band Switch, and if Option MPB is installed, suspect
switch 4. Also suspect the switching signals from the A15 Front End controller.
The control signals are explained in the Front End Control Troubleshooting
section.
Figure 5-11 RF Section
Keysight N9010A EXA Service Guide
for location of attenuator. If the attenuator output signal is correct
Figure
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