Nortel Passport 7400, Hardware Installation, Maintenance, And Troubleshooting, Page: 350 / 438

350 Chapter 37 Hardware procedures
241-7401-240 5.2S1
Removing a 16-slot Passport switch cooling unit
Remove a 16-slot Passport switch cooling unit to replace a failed unit. Some
types of air filter assemblies also require you to remove the cooling unit
drawer when replacing the air filter.
Prerequisites
Procedure steps
1 Use a 1/4-in. slot-head screwdriver to turn the handle locking screw 1/4
turn counter-clockwise. See the figure “16-slot Passport switch cooling
unit lock” (page 351).
2 Pull on the faceplate handle to disconnect the cooling unit from the power
input panel connector at the back of the unit.
A minor alarm occurs when you disconnect the cooling unit from an active
shelf assembly.
3 Pull the unit half way out with one hand. Place your other hand under the
partially removed cooling unit to support its weight. See the figure
“Removing a 16-slot Passport switch cooling unit” (page 352).
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.
CAUTION
Risk of equipment damage
Replace and restart cooling units within 10 minutes. You
can damage the CPs and FPs and they can fail if the
cooling fans are off longer than 10 minutes.