IBM THINKPAD T22 User Manual Page 63
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v Make sure you use the correct screw. If you have a
torque screwdriver, tighten all screws firmly to the torque
shown in the table. Never use a screw that you
removed. Use a new one. Make sure the screws are
tightened firmly.
Retaining serial numbers
This section includes the following descriptions:
v “Restoring the serial number of the system unit”
v “Retaining the UUID”
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 1.62, 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 1.62 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
FRU replacement notices
ThinkPad T20, T21, T22 and T23 series 57
- IBM Mobile Systems 1
- ThinkPad Computer 1
- Hardware Maintenance Manual 1
- About this manual 3
- Contents 5
- Introduction 7
- How to use error messages 8
- Diskette compatibility matrix 8
- Safety notices 10
- Safety information 19
- General safety 19
- Electrical safety 20
- Safety inspection guide 21
- Grounding requirements 23
- Laser compliance statement 24
- CAUTION: 25
- General descriptions 27
- Read this first 28
- Related service information 29
- Service web site 29
- Product Recovery program 30
- Using the recovery CD 31
- Passwords 32
- Supervisor password: 33
- Power management 34
- Standby mode 35
- Hibernation mode 36
- Checkout guide 38
- Testing the computer 38
- PC-Doctor 40
- Power system checkout 41
- Checking operational charging 42
- Checking the battery pack 42
- Checking the backup battery 43
- Product overview 47
- Specifications 47
- Status indicators 50
- FRU Tests 52
- Fn key combinations 54
- Symptom-to-FRU index 55
- Numeric error codes 55
- Error messages 58
- Beep symptoms 59
- No-beep symptoms 59
- LCD-related symptoms 60
- Intermittent problems 61
- Undetermined problems 61
- FRU replacement notices 62
- Screw notices 62
- Retaining serial numbers 63
- 1010 Battery pack 66
- 1020 Backup battery 67
- 1030 Hard-disk drive 69
- 1040 DIMM 71
- 1050 Mini PCI adapter 72
- 1060 Ethernet daughter card 76
- 1070 Ultrabay 2000 device 79
- 1080 Keyboard 80
- 1090 Keyboard CRU insulator 88
- 1100 Hinge cover 89
- For T20 and T21 series 90
- For T22 series 91
- (4 kgfcm) 92
- 1110 Keyboard bezel 94
- 1120 Fan assembly 100
- Removing and replacing a FRU 101
- For T23 series 102
- Step Screw (quantity) Torque 103
- (2.5 kgfcm) 103
- 1130 CPU 104
- 1140 PC Card slot assembly 106
- 1150 Speaker 109
- 1160 Hard-disk bay 111
- 1170 Ultrabay 2000 slot 113
- For T21 and T22 series 114
- 1180 System board 119
- 1190 Secure chip 123
- 1200 Microphone cable 124
- 2010 LCD assembly 125
- For MT2647-xLx, xNx 127
- 2020 Front bezel 128
- 2030 Inverter card 129
- 2040 LCD panel 130
- (continued) 131
- 2050 Antenna assembly 134
- 2060 Sub card 137
- 3010 ThinkPad Dock PCI cover 139
- 3020 ThinkPad Dock top cover 141
- (Bottom view) 142
- Locations 146
- Front view 146
- Rear view 147
- Bottom view 148
- Parts list 149
- For T20, T21 and T22 153
- AC adapters 162
- LCD FRUs 163
- 14.1-in. XGA TFT 164
- 14.1-in. SXGA+ TFT 165
- Keyboard 166
- Recovery CDs 167
- For Windows 2000 (T22 series) 168
- For Windows 98 (T23 series) 169
- For Windows 2000 (T23 series) 170
- For Windows XP (T23 series) 172
- Miscellaneous parts 173
- Optional FRUs 176
- Common parts list 178
- Power cords (docking station) 179
- Trademarks 180
- Part Number: 62P9631 182
- (1P) P/N: 62P9631 182
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