Keysight Technologies Option 503 Service Manual page 156

RF Section Troubleshooting (RF/Microwave Analyzers)
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. A20 YTO
6. 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
156
Chapter 16, "Assembly Replacement Procedures".
N9030A PXA Signal Analyzer Service Guide