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Retaining serial numbers
This section includes the following descriptions:
v “Restoring the serial number of the system unit”
v “Retaining the UUID”
v “Reading or writing the ECA information” on page 61
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 LENOVO ThinkPad SL Series Maintenance Diskette Version 1.01 or
later, and restart the computer.
2. From the main menu, select 1. Set System Identification.
3. Select 2. Read S/N data.
4. Select 1. Read system S/N data.
System information in your computer is displayed; the serial number of the system
unit is listed as follows:
v 07: Serial Number=
Write down that number.
Note: The serial number of the system unit is also written on the label attached to
the bottom of the computer.
After you have replaced the system board, restore the serial number by doing the
following:
1. Install the LENOVO ThinkPad SL Series Maintenance Diskette Version 1.01 or
later and restart the computer.
2. From the main menu, select 1. Set System Identification.
3. Select 1. Add S/N data.
4. Select 1. Add system S/N data.
Follow the instructions on the screen.
If the MTM and Product ID numbers differ from each other on the rear label, use
what is shown for the Product ID field. See example below:
MTM on rear label:
TTTT-CTO S/N SSSSSSS
Product ID on rear label:
TTTT-MMM (Use this number when setting Serial Number)
In the example, the Serial Number to be input is ’1STTTTMMMSSSSSSS’.
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.
ThinkPad SL400 and SL500 59