Keysight NFA Series Noise Figure Analyzers Service Guide 59
Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
Instrument Hangs at the Keysight Splash Screen
A problem of the instrument hanging at the Keysight splash screen could be
caused by many different things. It could be due to a down power supply, a
processor hardware problem, an instrument boot-up process error, etc.
1. Remove the AC power cord and then remove the instrument cover. Refer
to Chapter 15, “Assembly Replacement Procedures,” in this manual.
2. Remove the MP7 Top Brace. Refer to Chapter 15, “Assembly Replacement
Procedures”, on page 389 in this manual.
3. With the AC power applied and the On/Off button turned on, verify that all
of the power supply voltages are at their proper level. This can easily be
done by viewing the power supply LEDs on the back side of the A7
Midplane board. See “A7 Midplane Assembly Troubleshooting” on
page 315 of this manual.
Are all of the power supply voltages at the proper level?
If yes:
After verifying that the connections from the A7 Midplane board to
the A4 CPU board are not at fault, replace the A4 CPU board.
If no:
After verifying that the connections between the A6 Power Supply,
the A7 Midplane board, and the A8 Motherboard are all
mechanically and electrically secure, replace the A6 Power Supply
assembly.
PCI Enumeration Error
When the instrument is first booting up it runs some BIOS level self tests, one
of which is that of the devices on the PCI bus. If there is a problem with a
device on the PCI bus a “PCI enumeration” error may be seen on the boot
screen. Since the only assembly connected to the PCI bus, other than the A4
CPU board, is the A3 Digital IF assembly, try removing this assembly and
rebooting the instrument to see if the error goes away. Of course, you will have
other error messages due to this assembly being missing, but this will allow
you to isolate this particular error.
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