Replacing The Air Filter In A Multiservice Switch 7480 - Nortel 7400 Hardware Installation

Replacing the air filter in a Multiservice Switch 7480

Prerequisites
Procedure steps
Multiservice Switch 7400 Hardware Installation, Maintenance, and Upgrade 6.1S2
Replace the air filter in a Nortel Networks Multiservice Switch 7440 as part
of regular maintenance to ensure proper air flow and to validate processor
card warranties.
CAUTION
Risk of damage to equipment
Never operate a device for longer than 30 minutes
without an air filter. The air filter protects the power
converters, CPs, and FPs from dust and particles.
• You need an air filter with part number A0383866.
• Replace an air filter while the switch continues to operate. Remove and
insert an air filter without delay to minimize the amount of time the
switch operates without a filter.
• The device has two kinds of air filter assemblies. The spring-loaded air
filter assembly displays the label "Air filter, press to release." The air
filter assembly that is not spring-loaded displays the label, "Air filter,
remove cooling unit drawer first."
• The air filter must be replaced every 3 months or more often. Record the
frequency of replacement for the filter in the tables "Customer and
equipment profile" (page 499) and "Schedule for replacing air filters and
vacuuming equipment" (page 499). Ensure that you follow this
frequency. These tables and the figures "Removing the air filter assembly
from a Multiservice Switch 7480" (page 496), "Installing an air filter in
a Multiservice Switch 7480" (page 498), and "Changing the air filter pad
in a Multiservice Switch 7480" (page 497) are intended to be printed for
your records.
1 Locate the form for recording the air filter replacement for this switch. The
form is a hardcopy combination of the following:
• the table "Customer and equipment profile" (page 499)
Chapter 39 Hardware procedures 493