Agilent Technologies PSA Series Service Manual page 151

auto-boot process appears, the firmware files on the A26A2 Flash
board may be defective. Try loading new firmware before replacing the
A26 CPU or A26A2 Flash assemblies.
Suspect the DRAM (A26A1) board is not seated correctly or the board
has failed if 3 green LEDs on the CPU board remain on and the
following message displayed on screen:
CPU0
WARNING: Self tests have been disabled as a result of
FASTBOOT being enabled. To enable self tests, use the
FASTBOOT command in the CONFIG. menu and reboot the
system.
WARNING: One or more memory banks were not configured due
to a SIMM size mismatch or a SIMM failure. For more
details, use the MEMORY command in the CONFIG. menu.
Look at the instrument screen and read any error messages that might
appear. The messages can give you a clue as to what is happening when
the instrument hangs up.
Chapter 7
Troubleshooting the Processor, Power Supply, and Display
Verifying the A26 CPU Assembly
151