IBM Laptop MT 2632 User Manual Page 53
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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.
FRU replacement notices
ThinkPad A21e 49
- IBM Mobile Systems 1
- ThinkPad Computer 1
- Hardware Maintenance Manual 1
- Contents 3
- Introduction 5
- How to use error messages 6
- Diskette compatibility matrix 6
- 4 ThinkPad A21e 8
- 6 ThinkPad A21e 10
- Safety notices 11
- 8 ThinkPad A21e 12
- 10 ThinkPad A21e 14
- Safety information 16
- General safety 16
- Electrical safety 17
- Safety inspection guide 18
- Handling electrostatic 19
- Grounding requirements 20
- Laser compliance statement 20
- 18 ThinkPad A21e 22
- General descriptions 23
- 20 ThinkPad A21e 24
- Related service information 25
- Service Web site 25
- Using Recovery CD 25
- Passwords 26
- Power management 28
- Hibernation mode: 29
- 26 ThinkPad A21e 30
- Checkout guide 31
- Testing the computer 31
- 28 ThinkPad A21e 32
- PC-Doctor 33
- Power system checkout 33
- Checking the ac adapter 34
- Checking operational charging 34
- Checking the battery pack 35
- Checking the backup battery 36
- ThinkPad A21e 37
- 34 ThinkPad A21e 38
- Product overview 39
- Specifications 39
- Status indicators 40
- ThinkPad A21e 37 41
- FRU Tests 42
- ThinkPad A21e 39 43
- Fn key combinations 44
- Symptom-to-FRU index 45
- Numeric error codes 45
- 42 ThinkPad A21e 46
- ThinkPad A21e 43 47
- Error messages 48
- Beep symptoms 49
- No beep symptoms 49
- LCD-related symptoms 50
- Intermittent problems 50
- Undetermined problems 51
- FRU replacement notices 51
- Screw notices 51
- Retaining serial numbers 52
- Retaining the UUID 53
- Removing and replacing a FRU 54
- 1010 Battery pack 55
- 1020 DIMM 56
- 1030 Mini PCI adapter 57
- 54 ThinkPad A21e 58
- 1040 Backup battery 59
- 1050 Hard-disk drive 60
- ThinkPad A21e 57 61
- 1060 Ultrabay 2000 device 62
- (continued) 63
- ThinkPad A21e 59 63
- 1070 Keyboard 64
- ThinkPad A21e 61 65
- 62 ThinkPad A21e 66
- 1080 Keyboard CRU insulator 67
- 1090 Hinge cover 68
- Step Screw (quantity) Torque 69
- (4 kgfcm) 69
- 66 ThinkPad A21e 70
- 1110 Speaker cable 71
- 1120 Sub card 72
- ThinkPad A21e 69 73
- 1130 PC Card slot assembly 74
- 1140 Fan assembly 75
- 72 ThinkPad A21e 76
- 1150 Diskette drive 77
- 1160 Upper shield 78
- 1170 System board 79
- 76 ThinkPad A21e 80
- 2010 LCD assembly 81
- 78 ThinkPad A21e 82
- 2020 Front bezel 83
- 80 ThinkPad A21e 84
- 2030 Inverter card 85
- 14.1-in. and 15.0-in. panels 86
- 2040 LCD panel 87
- 84 ThinkPad A21e 88
- 86 ThinkPad A21e 90
- Locations 91
- Front view 91
- Rear view 92
- Bottom view 93
- Parts list 94
- ThinkPad A21e 91 95
- 92 ThinkPad A21e 96
- 12.1-in. SVGA TFT 97
- 14.1-in. XGA TFT 97
- 15.0-in. XGA TFT 97
- 15.0-in. XGA TFT (LG) 98
- Keyboard 99
- Miscellaneous parts 100
- ThinkPad A21e 97 101
- Optional FRUs 102
- Common parts list 103
- Trademarks 104
- ThinkPad A21e 101 105
- Part Number: 06P8883 106
- Printed in U.S.A 106
- (1P) P/N: 06P8883 106
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