Replacing
the
power
supply
assembly
Attention
Do
not
open
your
computer
or
attempt
any
repair
before
reading
the
“Important
safety
information”
in
the
Safety
and
Warranty
Guide
that
was
included
with
your
computer.
To
obtain
a
copy
of
the
Safety
and
Warranty
Guide
,
go
to
the
Support
Web
site
at
http://www.lenovo.com/support.
This
section
provides
instructions
on
how
to
replace
the
power
supply
assembly.
1.
Remove
the
computer
cover.
See
“Removing
the
cover”
on
page
11.
Note:
For
this
procedure,
it
helps
to
lay
the
computer
on
its
side.
2.
Disconnect
the
power
supply
cables
from
the
system
board
and
from
all
drives.
See
“Identifying
parts
on
the
system
board”
on
page
9.
3.
Remove
the
four
screws
at
the
rear
of
the
chassis
that
secure
the
power
supply.
4.
Lift
the
power
supply
out
of
the
chassis.
5.
Install
the
new
power
supply
into
the
chassis
so
that
the
screw
holes
in
the
power
supply
align
with
those
in
the
chassis.
6.
Install
the
four
screws
to
secure
the
power
supply
assembly.
Note:
Use
only
the
screws
provided
by
Lenovo.
7.
Reconnect
all
the
power
supply
cables
to
the
drives
and
the
system
board.
8.
Go
to
Chapter
4,
“Completing
the
parts
replacement,”
on
page
43.
Figure
19.
Removing
the
power
supply
screws
24
Hardware
Installation
and
Replacement
Guide
Summary of Contents for THINKCENTRE 9120
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