Rf Preselector Filter Hardware Control; Fpga Code; Pci Enumeration Error - Agilent Technologies N9039A Service Manual

Troubleshooting
A3 - Digital I/O Board Assembly
Figure 2-7 Trigger Output Timing Example

RF Preselector Filter Hardware Control

The A3 Digital I/O board assembly provides all of the communication to the four
RF input and filter boards via the Instrument Local Bus (ILB), which it is the
controller of. If the instrument is powered-up and appears to be running, but there
is a problem with the control of the filter boards, the A3 Digital I/O board
assembly would be the suspect assembly.

FPGA Code

The A3 Digital I/O board assembly also contains FPGA program code stored on it
that is loaded at boot up. This code is updated, if necessary, when the instrument
software is updated. Interruption of the FPGA update process can result in an A3
Digital I/O board being rendered non-functional, requiring a replacement board
assembly. For more information on updating the N9039A instrument software see
Chapter 9 , "Instrument Software".
If the FPGA code has loaded properly at instrument power-up there will be three
LEDs on the bottom side of the board on, two of which will be flashing.

PCI Enumeration Error

When the instrument is first booting up it runs some BIOS level self tests, one of
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