FRU REPLACEMENT NOTICES
Torque driver
If you have a torque driver, refer to the “Torque”
column with each step.
Make sure you use the correct screw, and tighten all
screws firmly to the torque shown in the table if you
have a torque screwdriver. Never use a screw that
you removed. Use a new one. Make sure the
screws are tightened firmly
System board replacement notice
This section includes the following descriptions:
“Restoring the system unit serial number”
“UUID” on page 36
Restoring the system unit serial number:
When the computer was manufactured, the EEPROM on
the system board was loaded with the serial numbers of
the system and all major components. The EEPROM
contains the following serial numbers:
System board serial number
System unit serial number
You must restore the system unit serial number to its
original value when replacing the system board.
To save the original serial number, do the following:
1. Install the ThinkPad Hardware Maintenance Diskette
Version 1.60 and restart the computer.
2. From the main menu, select 1. Set System
Identification.
3. Select 2. Read S/N data from EEPROM.
Each serial number is displayed with its device type. Write
down the serial number of the system unit. The device
type designations for each serial number are as follows:
20: System unit serial number
40: System board serial number
To restore the serial number after you have replaced the
system board, do the following:
1. Install the ThinkPad Hardware Maintenance Diskette
Version 1.60 and restart the computer.
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