Nortel DMS-100 Series Maintenance Manual page 650

13-48 OPM routine maintenance procedures
Filters inspection for cooling unit
OPM
(continued)
Filters inspection for cooling unit
At the FSP
1
2
3
4
5
6
7
8
297-8361-550 Standard 04.01 September 2000
DANGER
Rotating fan blades
Do not reach in more than 15.24 cm (6 in) beyond the upper
lip of the air-intake grille. If you reach in more than 15.24
cm, your fingers can contact the rotating blades of the
cooling unit fans.
On the frame supervisory panel (FSP), set the fan alarm override switch to
ON.
Inspect the frame trim panels.
If frame trim panels
overlap side edges of intake
grille
do not overlap side edges of in-
take grille
Remove the frame trim panels.
Grip both sides of the grille. Pull the grille toward you to separate the grille
from the magnetic catches.
Go to step 6.
Carefully pry the upper half of the grille away from the frame to remove the
grille.
Go to a work area outside the room that contains the switching system. To
clean the grille, use a dust cloth or a vacuum cleaner.
Inspect filter surfaces.
If filter surfaces
appear dirty
appear clean
Shine a trouble light through the filter.
If light
is visible through the filter
Do
step 3
step 5
Do
step 11
step 8
Do
step 9