Restoring The Serial Number Of The System Unit; Retaining The Uuid; Reading Or Writing The Eca Information - Lenovo 3000 N100 Hardware Maintenance Manual

FRU replacement notices
v "Retaining the UUID"
v "Reading or writing the ECA information"

Restoring the serial number of the system unit

When the computer was manufactured, the EEPROM on the system board was
loaded with the serial numbers of the system and all major components. These
numbers need to remain the same throughout the life of the computer.
If you replace the system board, you must restore the serial number of the system
unit to its original value.
Before replacing the system board, save the original serial number by doing the
following:
1. Install the CE Utility Diskette for Lenovo 3000 series notebooks, and restart the
2. From the main menu, select 1. Set System Identification.
3. Select 2. Read S/N data from EEPROM.
The serial number of each device in your computer is displayed; the serial number
of the system unit is listed as follows:
v 20: Serial number
Write down that number.
Note: The serial number of the system unit is also written on the label attached to
After you have replaced the system board, restore the serial number by doing the
following:
1. Install the CE Utility Diskette for Lenovo 3000 series notebooks and restart the
2. From the main menu, select 1. Set System Identification.
3. Select 1. Add S/N data from EEPROM.

Retaining the UUID

The Universally Unique Identifier (UUID) is a 128-bit number uniquely assigned to
your computer at production and stored in the EEPROM of your system board.
The algorithm that generates the number is designed to provide unique IDs until
the year A.D. 3400. No two computers in the world have the same number.
When you replace the system board, you must set the UUID on the new system
board as follows:
1. Install the CE Utility Diskette for Lenovo 3000 series notebooks, and restart the
2. From the main menu, select 4. Assign UUID.

Reading or writing the ECA information

Information on Engineering Change Announcements (ECA) are stored in the
EEPROM of the system board. The electronic storage of this information simplifies
the procedure to check if the ECA has been previously applied to a machine. The
machine does not need to be disassembled to check for the ECA application.
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MT 0689, 0690, 0768
computer.
the bottom of the computer.
computer.
Follow the instructions on the screen.
computer.
A new UUID is created and written. If a valid UUID already exists, it is not
overwritten.