Agilent Technologies N9039A Service Manual page 53

Troubleshooting
A3 - Digital I/O Board Assembly
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 Processor board, is the
A3 Digital I/O board 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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