Chapter 39 Hardware procedures 485
Multiservice Switch 7400 Hardware Installation, Maintenance, and Upgrade 6.1S2
• the figure “Removing the air filter from a Multiservice Switch 7440”
(page 486)
• the figure “Installing an air filter in a Multiservice Switch 7440”
(page 487)
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 488).
2 Turn the latch on the cooling-unit door one-quarter turn counter-clockwise
to unlock the door. See the figure “Removing the air filter from a
Multiservice Switch 7440” (page 486).
3 Open the door to access the cooling equipment.
4 Pull the filter’s leading edge toward you carefully. Remove the filter slowly.
5 Insert the old filter into a dust-retaining container.
6 Insert the new filter into the air-filter tracks. Push the filter all the way into
the device.
7 Close the cooling unit door.
8 Turn the latch 1/4 turn clockwise to lock the cooling unit door.
9 Record the filter replacement on the hardcopy of table “Schedule for
replacing air filters and vacuuming equipment” (page 488). Keep this
record to validate the warranties of processor cards that are returned to
Nortel Networks.
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