Chapter 12 423
Post-Repair Procedures
Configuring a Replacement CPU Assembly
NOTE The serial number stored in memory is used to enable all licensed
options. If the stored serial number is different from the rear panel
serial number sticker, then the instrument has an incorrect CPU board
installed or an incorrect serial number was entered into the CPU when
it was last replaced. If the two serial numbers do not match, determine
the cause and correct the problem.
If you cannot correct the problem, and you use the rear panel serial
number on the new CPU board, the keywords associated with the
stored serial number will no longer enable the options. In this case,
contact Agilent Technologies sales and service office for the correct
license numbers for your instrument. To contact the Agilent
Technologies sales and service office, refer to “Contacting Agilent
Technologies” on page 37.
Replacing the Processor Assembly
There are two boards mounted on the main processor assembly (A26)
board: the A26A1 DRAM board and the A26A2 Flash board. These
boards must be removed from the defective CPU board and installed on
the new CPU board.
The Flash memory board contains the operating system, main
firmware, measurement personality firmware, license key words. The
DRAM memory board can be costly to replace. Transferring the Flash
memory board from the defective processor board will save time
otherwise required to reconfigure. Transferring both boards will help
keep repair cost low.
Remove the insulator between the battery and battery clip, or remove
the battery from the new replacement CPU for 2 to 3 minutes. This will
allow the new CPU to obtain data (such as the attenuator actuations)
stored on other instrument assemblies.
Refer to assembly replacement procedure “A26A1 DRAM and A26A2
Flash Boards” on page 388 for details on replacing the defective main
processor board and transferring the two memory boards.
Entering Configuration Information
After the processor is replaced, restore power to the instrument and
enter the necessary configuration information.
Confirm the instrument boots up. There may be some error messages,
but they will go away when the instrument is booted a second time.
CAUTION Because the serial number can not be removed once it is entered,
ensure that the new processor board corrects the problem before
continuing with this procedure.
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