Keysight Technologies N9040B UXA Signal Analyzer Service Guide 159
RF Section Troubleshooting (RF/Microwave Analyzers)
Troubleshooting
Connect W16 output to a functioning spectrum analyzer and verify the
322.5 MHz intermediate frequency is measuring −31 ± 4 dB as shown in Figure
4-8.
Figure 4-8 322.5 MHz Intermediate Frequency
If this power level is correct the Front End assembly is operating correctly in
high band. If this power level is incorrect verify the following assemblies using
the 4.8 GHz internal calibrator signal.
1. A11 Low Band Switch
2. A10 Input Attenuator B
3. A9 Input Attenuator A
4. A16 Reference Assembly (4.8 GHz calibrator)
5. A20 YTO
6. A12 YTF Preselector
7. A13 Front End Assembly
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