Lenovo 3000 N100 Hardware Maintenance Manual

Also see for 3000 N100: Hardware Maintenance Manual Brochure & specs Brochure Install guide Setup poster

Contents

v “Retaining the UUID”v “Reading or writing the ECA information”Restoring the serial number of the system unitWhen the computer was manufactured, the EEPROM on the system board wasloaded with the serial numbers of the system and all major components. Thesenumbers 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 systemunit to its original value.Before replacing the system board, save the original serial number by doing thefollowing:1. Install the CE Utility Diskette for Lenovo 3000 series notebooks, and restart thecomputer.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 numberof the system unit is listed as follows:v 20: Serial numberWrite down that number.Note: The serial number of the system unit is also written on the label attached tothe bottom of the computer.After you have replaced the system board, restore the serial number by doing thefollowing:1. Install the CE Utility Diskette for Lenovo 3000 series notebooks and restart thecomputer.2. From the main menu, select 1. Set System Identification.3. Select 1. Add S/N data from EEPROM.Follow the instructions on the screen.Retaining the UUIDThe Universally Unique Identifier (UUID) is a 128-bit number uniquely assigned toyour computer at production and stored in the EEPROM of your system board.The algorithm that generates the number is designed to provide unique IDs untilthe 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 systemboard as follows:1. Install the CE Utility Diskette for Lenovo 3000 series notebooks, and restart thecomputer.2. From the main menu, select 4. Assign UUID.A new UUID is created and written. If a valid UUID already exists, it is notoverwritten.Reading or writing the ECA informationInformation on Engineering Change Announcements (ECA) are stored in theEEPROM of the system board. The electronic storage of this information simplifiesthe procedure to check if the ECA has been previously applied to a machine. Themachine does not need to be disassembled to check for the ECA application.FRU replacement notices42 MT 0689, 0690, 0768