Removing The Cooling Unit From A Multiservice Switch 7440 - Nortel 7400 Hardware Installation

Removing the cooling unit from a Multiservice Switch 7440

Prerequisites
Procedure steps
Multiservice Switch 7400 Hardware Installation, Maintenance, and Upgrade 6.1S2
Remove the cooling unit from a Nortel Networks Multiservice Switch 7440
if the unit fails.
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.
1 To unlock the door, use a 1/4-in. slot-head screwdriver to turn the locking
latch on the cooling unit door 1/4 turn counter-clockwise. See the figure
"Cooling unit lock on a Multiservice Switch 7480" (page 462).
2 Open the door to access the cooling equipment.
3 If you have the newer model cooling unit, the wires that connect the fans
to the device are at the front of the fan tray. Cut the tie wrap and
disconnect each connector. If you do not have the newer model, continue
to the next step.
4 Pull the front edge of the cooling unit toward you carefully. Remove the
cooling unit slowly.
Chapter 39 Hardware procedures 455