Nortel 7400 - Page 494

494 Chapter 39 Hardware procedures
NN10600-175 6.1S2
• the table “Schedule for replacing air filters and vacuuming
equipment” (page 499)
• the figure “Removing the air filter assembly from a Multiservice
Switch 7480” (page 496)
• the figure “Installing an air filter in a Multiservice Switch 7480”
(page 498)
• the figure “Changing the air filter pad in a Multiservice Switch 7480”
(page 497)
If a form has not been started for this switch, print a copy of the form and
fill in the table “Customer and equipment profile” (page 499).
2 If the air filter assembly is spring-loaded, carefully press and release the
center of the air filter cartridge. This action disengages the air filter
assembly.
or
If the air filter assembly is not spring-loaded, remove the cooling unit
drawer. See the procedure “Removing the cooling unit from a Multiservice
Switch 7480” (page 461).
3 Carefully pull the air filter assembly out of its slot. See the figure
“Removing the air filter assembly from a Multiservice Switch 7480”
(page 496).
4 Turn the air filter assembly so that the bottom side faces up. See the figure
“Changing the air filter pad in a Multiservice Switch 7480” (page 497).
5 Open the filter gate.
6 Remove the old filter pad and replace it with a new filter pad.
7 Insert the old filter into a dust-retaining container.
8 Close the filter gate.
9 With the filter gate face down, slide the air filter assembly into its slot at
the top of the cooling unit chassis. See the figure “Installing an air filter in
a Multiservice Switch 7480” (page 498).
10 If the air filter assembly is spring-loaded, carefully press and release the
center of the assembly to fasten it in position.
or
If the air filter assembly is not spring-loaded, replace the cooling unit
drawer.