256 Keysight N9010A EXA Service Guide
Front End Control Troubleshooting
A15 Front End Control Assembly Troubleshooting
Verifying Wideband IF Out (A15J901, Option B40 only)
The outer cover and top shield need to be removed to verify A15J901 output.
Refer to Chapter 15, “Assembly Replacement Procedures” for the removal
procedure. Press Mode, IQ Analyzer (Basic), Mode Preset on the analyzer.
Press Input/Output, RF Calibrator, 50 MHz, Freq, 50 MHz, Amptd,
Attenuation, 10 dB, Amptd, More 1 of 2, Internal Preamp Off, System,
Alignments, Auto Align, Off. Disconnect the cable marked J901 that plugs
into the Front End Controller board and connect a functioning spectrum
analyzer where the cable was plugged in. J901's I.F. output will vary
depending on the I.F. path that is chosen. Press Mode Setup, IF Path and
select 40 MHz. If the switch path is working correctly in the A15 Front End
Controller board, the functioning spectrum analyzer should measure 250 MHz
at ~-30 dBm.
In order for these I.F. levels to measure correctly, the I.F. input at A15J902
must be correct. Refer to Chapter 4, “RF Section Troubleshooting
(RF/Microwave Analyzers)”. Reconnect all cables to their correct location
when finished.
Verifying Aux IF Out, Rear Panel (Option CR3, CRP only)
The Aux I.F. output connector on the rear panel is installed on all analyzers
equipped with the EFEC or S-EFEC version of the A15, however the actual Aux
I.F. output frequency will vary depending on the options installed. These
options are all enabled with a license key. The first step in verifying the Aux I.F.
output is the make sure the option is licensed by pressing System, Show,
System on the analyzer and make sure the option identifies itself in the table.
The I.F. switch path and frequency generation occurs on the A15, Front End
Controller board. This troubleshooting procedure provides the instrument
setups to verify Options CR3 and CRP. Test the Aux I.F. output based on the
options installed in the analyzer.
Standard Analyzer
No test to perform.
Only the EFEC supports Option CRP.
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