Lenovo ThinkPad X23 ThinkPad X20, X21, X22, X23, X24 Hardware Maintenance Manu - Page 61

Removing and replacing a FRU, Before removing any FRU, power off the computer - review

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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 short-circuit it. Dispose of the battery pack as required by local ordinances or regulations. Chapter 3. ThinkPad X20, X21, X22, X23, X24 57

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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
short-circuit it. Dispose of the battery pack as required
by local ordinances or regulations.
Chapter 3. ThinkPad X20, X21, X22, X23, X24
57