Lenovo 019624U Hardware Maintenance Manual

Contents

MTM on rear label:TTTT-CTO S/N SSSSSSSProduct 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 UUIDThe Universally Unique Identifier (UUID) is a 128-bit number uniquely assigned to your computer atproduction and stored in the EEPROM of your system board. The algorithm that generates the number isdesigned to provide unique IDs until the year A.D. 3400. No two computers in the world have the samenumber.When you replace the system board, you must set the UUID on the new system board as follows:1. Install the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later, and restart thecomputer.2. From the main menu, select 4. Assign UUID. A new UUID is created and written. If a valid UUID alreadyexists, it is not overwritten.Reading or writing the ECA informationInformation 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 previouslyapplied to a machine. The machine does not need to be disassembled to check for the ECA application.To check what ECAs have been previously applied to the machine, use the ECA Information Read/Writefunction 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 thecomputer.2. From the main menu, select 6. Set ECA Information.3. To read ECA information, select 2. Read ECA/rework number from EEPROM and follow theinstruction.4. To read box build date, select 5. Read box build date from EEPROM, and follow the instruction onthe screen.After an ECA has been applied to the machine, the EEPROM must be updated to reflect the ECA'sapplication. Use the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later to update theEEPROM.Note: Only the ECA number is stored in the EEPROM. The machine type of the ECA is assumed be the sameas the machine type of the machine that had the ECA applied to it.1. Insert the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later, and restart thecomputer.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 theinstruction.4. To write box build date, select 4. Write box build date from EEPROM, and follow the instruction onthe screen.If the system board is being replaced, try to read the ECA information from the old system board and transferthe information to the new system. If the system board is inoperable, this will not be possible.Chapter 7. FRU replacement notices 49