484 Chapter 39 Hardware procedures
NN10600-175 6.1S2
Replacing the air filter in a Multiservice Switch 7440
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.
Prerequisites
• You need an air filter with part number A0626924.
• 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.
• You need a bag to contain the old filter after it is removed. This reduces
the amount of floating dust from handling the filter.
• The air filter is inside the cooling unit and can be accessed only by
removing the cooling unit.
• 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 488) and “Schedule for replacing air filters and
vacuuming equipment” (page 488). Ensure that you follow this
frequency. These tables and the figures “Removing the air filter from a
Multiservice Switch 7440” (page 486) and “Installing an air filter in a
Multiservice Switch 7440” (page 487) are intended to be printed for your
records.
Procedure steps
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 488)
• the table “Schedule for replacing air filters and vacuuming
equipment” (page 488)
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.
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