Removing The Cooling Unit From A Multiservice Switch 7460 - Nortel 7400 Hardware Installation

458 Chapter 39 Hardware procedures

Removing the cooling unit from a Multiservice Switch 7460

Prerequisites
Procedure steps
NN10600-175 6.1S2
Remove the cooling unit from a Multiservice Switch 7460 in preparation to
restore the full cooling capabilities.
CAUTION
Risk of equipment damage
Remove and restart cooling units in under 10 minutes.
You can damage CPs and FPs and they can fail if the
fans are off longer than 10 minutes.
WARNING
Risk of injury by fan blades
Do not handle the fans while the blades are rotating. When
you remove a cooling unit, wait until the fan blades stop
before you continue.
WARNUNG
Verletzungsgefahr durch Lüfterblätter
Berühren Sie einen Lüfter niemals, während die Blätter
rotieren. Warten Sie bis zum vollständigen Stillstand der
Lüfterblätter, bevor Sie ein Kühlaggregat entfernen.
• The cooling unit provides enough cooling for a fully provisioned shelf
when only 4 of its 5 fans are running. The fifth fan is for redundancy. If
a fan fails, a software alarm is generated. To restore operation to a failed
fan, you must replace the entire cooling unit.
1 Unfasten the 2 Phillips captive thumb screws on the faceplate of the
cooling unit. See the figure "Exploded view of a cooling unit and
Multiservice Switch 7460" (page 460).
2 Use the captive screws to disengage the cooling unit from its power
connection. Stop when you can get fingers behind the upper and lower
edges of the faceplate.