Keysight Technologies X Series Service Manual page 200

RF Section Troubleshooting (RF/Microwave Analyzers)
Troubleshooting
The following High Band path items have been verified in the RF section:
— 4.8 GHz Calibrator signal power level from the A16 Reference Board
— 1st L.O. power level from the A14 L.O. Synthesizer
— Switch control logic from the A15 Front End Control Board to:
— Input Attenuator A
— Input Attenuator B
— Low Band Switch
— YTF Preselector
If all the power levels and biasing from the A15 Front End Control board
measure correctly up to this point, the most probable cause would be the A13
Front End Assembly.
High Band #2 RF signal path utilizes a high band mixer internal to the A13 RF Front End
Assembly for RF input frequencies from 13.6 GHz to 26.5 GHz. Since all the control voltages and
biasing were already fully tested, failures from 13.6 GHz - 26.5 GHz will most likely be caused by
the A13 RF Front End Assembly. If the failure is amplitude related, proper adjustments such as
frequency response and the YTF Preselector adjust should be performed first before changing
the A13 RF Front End Assembly. Refer to
200
•Input Attenuator A
•Input Attenuator B
•Low Band Switch
•YTF Preselector
•RF Front End Assembly
Chapter 12, "Block Diagrams."
Keysight N9010A EXA Service Guide
for details.