208 Keysight NFA Series Noise Figure Analyzers Service Guide
RF Section Troubleshooting (N8976B)
Troubleshooting
If this power level is incorrect, the following assemblies need to be verified
using the 50 MHz internal calibrator signal. Be sure the 50 MHz calibrator is
turned on. Press Input/Output, RF Calibrator, 50 MHz when verifying the
performance.
1. A11 Low Band Switch
2. A10 Input Attenuator B
3. A9 Input Attenuator A
4. A16 Reference Assembly (50 MHz calibrator, 2nd LO)
5. A13 RF Front End Assembly
In order to gain access to the front end components, remove the front frame assembly, but leave
the ribbon cable connected so you can still control the instrument. Remove the right side
chassis. Refer to the removal procedures in Chapter 15, “Assembly Replacement
Procedures.”.
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