Removing and replacing a FRU
This section presents information and drawings for use in removing and replacing a FRU. Be sure to observe the following general rules:
1.Do not try to service the computer unless you have been trained and certified. An untrained person runs the risk of damaging parts.
2.Before replacing any FRU, review “FRU replacement notices” on page 54.
3.Begin by removing any FRUs that have to be removed before the failing FRU. Any such FRUs are listed at the top of the page. Remove them in the order in which they are listed.
4.Follow the correct sequence in the steps for removing the FRU, as indicated in the drawings by the numbers in square callouts.
5.When turning a screw to replace a FRU, turn it in the direction indicated by the arrow in the drawing.
6.When removing the FRU, move it in the direction indicated by the arrow in the drawing.
7.To put the new FRU in place, reverse the removal procedure and follow any notes that pertain to replacement. For information about connecting and arranging internal cables, see “Locations” on page 98.
8.When replacing a FRU, use the correct screw as shown in the procedures.
CAUTION:
Before removing any FRU, power off the computer, unplug all power cords from electrical outlets, remove the battery pack, and then disconnect any interconnecting cables.
CAUTION:
The battery consists of small amount of nickel. Do not disassemble it, throw it into fire or water, or
Chapter 3. ThinkPad X20, X21, X22, X23, X24 57
