IBM MT 2632 manual Restoring the serial number of the system unit, Retaining the Uuid

Page 53

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. 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 ThinkPad hardware maintenance diskette version 1.61, and restart the computer.

2.From the main menu, select 1. Set System Identification.

3.Select 2. Read S/N data from EEPROM.

The serial number for each device is displayed. Write down the serial number of the system unit, designated as follows:

20: System unit serial number

After you have replaced the system board, restore the serial number by doing the following:

1.Install the ThinkPad hardware maintenance diskette version 1.61 and restart the computer.

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.

Note: The serial number of the system unit is written on the label attached on the bottom of the computer.

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. The algorithm that generates the number is designed to provide unique IDs until the 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 system board as follows:

1.Install the ThinkPad hardware maintenance diskette version 1.61, 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 is not overwritten.

ThinkPad A21e 49

Image 53

Contents Page Copyright IBM Corp Contents LCD FRU Strategy for replacing FRUs Important service informationBefore replacing parts Strategy for replacing a hard-disk drive How to use error messagesDiskette compatibility matrix Safety notice Safety notices multilingual translationsSafety notice Continuation of Safety notice Safety notice Safety notice Continuation of Safety notice Safety notice Safety notice Safety notice General safety Safety informationElectrical safety Safety inspection guide Handling electrostatic discharge-sensitive devices Laser compliance statement Grounding requirementsDo not open ThinkPad A21e What to do first Read this firstFollowing are not covered under warranty Service Web site Related service informationUsing Recovery CD To create Service Partition SPPower-on password PasswordsHard-disk password Supervisor passwordSelect Power-On Password How to remove the power-on passwordHow to remove the hard-disk password Screen blank mode Power managementStandby mode Select either User HDP or Master HDPHibernation mode Related service information Checkout guide Testing the computerDiagnostics Interactive Tests Detecting system information with PC-Doctor Power system checkoutHardware Info UtilityChecking operational charging Checking the ac adapterFor Nickel metal hydride battery Checking the battery packFor Lithium ion battery Checking the backup battery ThinkPad A21e Trademarks Product overview SpecificationsBlinking orange Status indicatorsIndicator Meaning Following table shows the test for each FRU FRU TestsFRU Fn + F3 Fn key combinationsNumeric error codes Symptom-to-FRU indexDimm IBM Bios Setup Utility Error messages Beep symptoms Intermittent problems LCD-related symptomsScrew notices Undetermined problemsFRU replacement notices Plastic to plastic Retaining serial numbersLogic card to plastic Torque driverSelect 2. Read S/N data from Eeprom Restoring the serial number of the system unitRetaining the Uuid Removing and replacing a FRU Battery pack Dimm Mini PCI adapter Removing and replacing a FRU Dimm Backup batteryDo not drop or apply any shock to the hard-disk Hard-disk driveRemoving and replacing a FRU Ultrabay 2000 device ThinkPad A21e Keyboard ThinkPad A21e Connector on the underside of the key then push Keyboard CRU insulator Hinge cover Keyboard bezel and speaker Step Screw quantity Torque Speaker cable Sub card M2.5 × 4.8 mm, nylon-coated 39.2 Ncm Kgfcm PC Card slot assembly Fan assembly Removing and replacing a FRU Diskette drive Upper shield System board M2.5 × 4.8 mm, nylon-coated 39.2 Ncm Kgfcm LCD assembly ThinkPad A21e Front bezel ThinkPad A21e 12.1-in. panel Inverter card14.1-in. and 15.0-in. panels LCD panel ThinkPad A21e 2628-Jxx M2.0 × 5.7 mm 24.5 Ncm Nylon-coated Kgfcm ThinkPad A21e Locations Front view Rear view Bottom view Parts list Parts marked with asterisk are CRU customer replacable unit MB Sdram SO Dimm LCD FRU 15.0-in. XGA TFT LG Keyboard Miscellaneous parts ThinkPad A21e Optional FRUs Power cords system Common parts listTrademarks ThinkPad A21e Part Number 06P8883