To check what ECAs have been previously applied to the machine, use the ECA Information Read/Write function on the ThinkPad Hardware Maintenance Diskette Version 1.73 or later. The machine does not need to be disassembled to check for the ECA application. The electronic storage of this information simplifies the procedure to check if the ECA has been previously applied to a machine. Reading or writing the ECA information Information on Engineering Change Announcements (ECA) are stored in the EEPROM of the system board. If a valid UUID already exists, it is not overwritten. Install the ThinkPad Hardware Maintenance Diskette Version 1.73 or later, and restart the computer. When you replace the system board, you must set the UUID on the new system board as follows: 1. No two computers in the world have the same number. The algorithm that generates the number is designed to provide unique IDs until the year A.D. 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. Install the ThinkPad Hardware Maintenance Diskette Version 1.73 or later and restart the computer. After you have replaced the system board, restore the serial number by doing the following: 1. Note: The serial number of the system unit is also written on the label attached to the bottom of the computer. 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. Before replacing the system board, save the original serial number by doing the following: 1. If you replace the system board, you must restore the serial number of the system unit to its original value. These numbers need to remain the same throughout the life of the computer. FRU replacement notices 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.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
January 2023
Categories |