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4.5
COOLING
FANS
4.5.1
Rear Fan Removal
1.
Turn·off system and monitor power.
2.
Remove
the
system
ac
power
cord
receptacle.
REPLACEMENT
from
the
wall
3.
Remove the system
unit
front
cover
and
rear
cover.
Grasp
each
end. of the cover and pull the cover toward
you (Figures 4·1 and 4·8).
4.
Note the position of any external
cables
connected
to
the
Patch and Filter Panel assembly.
Remove the cables
(Figure 4-2).
5.
Remove the rear chassis retaining bracket on
the
rear,
left side of the system unit.
6.
Slide the system unit out of the enclosure.
7.
Remove the
power
supply
as
described
in
subsection
4.3.1, steps 7 through 12.
8.
Remove the four screws and spacers holding
the
fan
to
the chassis; lift the fan and guard from the chassis.
4.5.2
Rear Fan Replacement
1.
Place the four fan mounting screws in the chassis holes.
4-27
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