IBM 4840-544 Service Guide - Page 83

Power, supply, removing, replacing

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August 3, 2006 Power supply Power supply - removing and replacing Note: Later versions of power supply keep the fan running when the system is connected to power, but has been powered Off. This is normal operation. 1. Switch OFF the power to the SurePOS 500 Models 5x3 and 544/564. Unplug the power cord from the external power source. 2. Remove the back cover as described at "Rear cover - removing and replacing" on page 38. 3. Remove the cable tie bar as described at "Cable tie bar - removing and replacing" on page 58. 4. Unplug the AC power cord on the back of the power supply. 5. Remove the two screws at the base of the power supply, as shown in Figure 37. 6. Slide the bottom of the power supply back and down until the upper lugs A clear the hooks B , as shown. 7. Disconnect the four power supply cables from the system board, interface board, and power supply cable. B A Figure 37. Power supply remove/replace To replace the power supply, reverse this procedure. Chapter 4. Removing and replacing FRUs for the SurePOS 500 Models 5x3 and 544/564 57

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Power
supply
–
removing
and
replacing
Note:
Later
versions
of
power
supply
keep
the
fan
running
when
the
system
is
connected
to
power,
but
has
been
powered
Off.
This
is
normal
operation.
1.
Switch
OFF
the
power
to
the
SurePOS
500
Models
5x3
and
544/564.
Unplug
the
power
cord
from
the
external
power
source.
2.
Remove
the
back
cover
as
described
at
“Rear
cover
–
removing
and
replacing”
on
page
38.
3.
Remove
the
cable
tie
bar
as
described
at
“Cable
tie
bar
–
removing
and
replacing”
on
page
58.
4.
Unplug
the
AC
power
cord
on
the
back
of
the
power
supply.
5.
Remove
the
two
screws
at
the
base
of
the
power
supply,
as
shown
in
Figure
37.
6.
Slide
the
bottom
of
the
power
supply
back
and
down
until
the
upper
lugs
±A²
clear
the
hooks
±B²
,
as
shown.
7.
Disconnect
the
four
power
supply
cables
from
the
system
board,
interface
board,
and
power
supply
cable.
To
replace
the
power
supply,
reverse
this
procedure.
A
B
Figure
37.
Power
supply
remove/replace
Power
supply
August
3,
2006
Chapter
4.
Removing
and
replacing
FRUs
for
the
SurePOS
500
Models
5x3
and
544/564
57