MTM on the rear label:
Product ID on the rear label:
In the example, the Serial Number to be input is “1STTTTMMMSSSSSSS”.
Retaining the UUID
The Universally Unique Identifier (UUID) is a
When you replace the system board, you must set the UUID on the new system board by doing the following:
1.Install the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later, and restart the computer.
2.From the main menu, select 4. Assign UUID. A new UUID is created and written. If a valid UUID already exists, it will not be overwritten.
Reading or writing the ECA information
Information on Engineering Change Announcements (ECA) is stored in the EEPROM of the system board. The electronic storage of this information simplifies the procedure to check if an engineering change has been previously applied to a computer.
To check what engineering changes have been previously applied to the machine, use the ECA information read/write function on the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later.
1.Insert the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later, and restart the computer.
2.From the main menu, select 6. Set ECA Information.
3.To read the ECA information, select 2. Read ECA/rework number from EEPROM and follow the instruction.
4.To read the box build date, select 5. Read box build date from EEPROM, and follow the instructions on the computer.
After an engineering change is applied to the machine, the EEPROM must be updated. Use the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later to update the EEPROM.
Note: Only the ECA number is stored in the EEPROM. The machine type of the ECA is assumed to be the same as the machine type of the machine that had the engineering change applied to it.
1.Insert the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later, and restart the computer.
2.From the main menu, select 6. Set ECA Information.
3.To write ECA information, select 1. Write ECA/rework number from EEPROM, and follow the instruction.
4.To write box build date, select 4. Write box build date from EEPROM, and follow the instruction on the screen.
If the system board is being replaced, try to read the ECA information from the old system board and transfer the information to the new system board. If the system board is inoperable, this will not be possible.
Chapter 7. FRU replacement notices 47