Keysight NFA Series Noise Figure Analyzers Service Guide 295
CPU/Disk Drive Troubleshooting
A4 Processor Assembly Troubleshooting
A4 Processor Assembly Troubleshooting
The A4 Processor assembly is serviced as an assembly only; no component
level repair is supported.
Boot-Up or Initialization Problems
Typical failures of the A4 Processor assembly will cause the instrument to not
boot-up or initialize properly. Of course, these types of failures can also be
caused by a variety of other assemblies as well. In order to determine whether
a problem such as this is being caused by a defective A4 Processor assembly,
first see “Instrument Boot Up Process” on page 47 to eliminate other
possibilities.
BIOS Settings
As with other types of PC processor assemblies the A4 Processor assembly has
a number of settings particular to the hardware on the board assembly. These
settings are saved in a separate memory location on the board and accessed
by the BIOS (Basic Input Output System) Setup Utility. If these settings are
changed from those that the instrument was initially shipped with this could
cause a problem with the booting and/or functionality of the instrument.
If the instrument is having a problem booting up, but is functional enough to
enter the BIOS Setup Utility you will want to verify that the BIOS settings have
not been changed.
Accessing BIOS Setup Utility
To easily navigate the BIOS Setup Utility you will want to have an external USB
keyboard connected to the instrument. Then, when the initial Keysight
Technologies splash screen is displayed at power-up, press the key on the
keyboard specified on the initial boot screen (typically the DEL key). Once this
is pressed you will see the main BIOS Setup Utility screen.
Load Defaults
The instrument was originally shipped from the factory with all of the BIOS
settings in their default position. If these have been changed for some reason
they can all be returned to their default position by navigating to the Save &
Exit screen and select Restore Defaults. Once the defaults have been loaded
select Save Changes and Exit.
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