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FRU Removals and Replacements
This section contains information about removals and
replacements.
Do not damage any parts. Only certified and trained
personnel should service the computer.
The arrows in this section show the direction of move-
ment to remove a FRU, or to turn a screw to release
the FRU. The arrows are marked in numeric order, in
square callout, to show the correct sequence of
removal.
When other FRUs must be removed before the failing
FRU is removed, they are listed at the top of the
page.
To replace a FRU, reverse the removal procedure
and follow any notes that pertain to replacement.
When replacing a FRU, use the correct screw size, as
shown in the procedures.
Safety Notice 1: Translation on page 4
Before the computer is powered-on after FRU replace-
ment, make sure all screws, springs, or other small
parts, are in place and are not left loose inside the
computer. Verify this by shaking the computer and lis-
tening for rattling sounds. Metallic parts or metal
flakes can cause electrical short circuits.
Safety Notice 3: Translation on page 6
The battery pack contains small amounts 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.
Safety Notice 8: Translation on page 10
Before removing any FRU, power-off the computer,
unplug all power cords from electrical outlets, remove
the battery pack, and then disconnect any intercon-
necting cables.
An electrostatic discharge (ESD) strap (P/N 6405959) must
be used to establish personal grounding.
FRU Service Procedures
Review the following procedures before replacing any
FRU.
60 ThinkPad 390E