Replacing A Side Air Filter On A T640 Ac Power Supply; Removing A Side Air Filter On A T640 Ac Power Supply - Juniper T640 Hardware Manual

Replacing a Side Air Filter on a T640 AC Power Supply

Copyright © 2013, Juniper Networks, Inc.
1. Removing a Side Air Filter on a T640 AC Power Supply on page 375
Installing a Side Air Filter on a T640 AC Power Supply on page 376
2.

Removing a Side Air Filter on a T640 AC Power Supply

To remove an AC power supply side air filter:
NOTE: The router has either one nonredundant power supply or two
redundant, load-sharing power supplies. If you have only one power supply,
you must power off the system before removing the side air filter on an AC
power supply. Each redundant power supply is hot-removable and
hot-insertable. When a redundant power supply is powered down or removed,
the other power supply automatically assumes the entire electrical load for
the router.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
1.
the strap to one of the ESD points on the chassis.
Switch the power switch on the power supply faceplate to the standby position.
2.
NOTE: After powering off a power supply, wait at least 60 seconds before
turning it back on.
Detach the ESD grounding strap from the ESD points on the chassis. Reattach the
3.
strap to an approved site ESD grounding point. Follow the instructions for your site.
Switch off the customer site circuit breakers to the power supply. Make sure that the
4.
voltage across the AC power source cable leads is 0 V and that there is no chance
that the cables might become active during the replacement.
Disconnect the AC power cord from the AC power source.
5.
Reattach the ESD grounding strap to one of the ESD points on the chassis.
6.
Grasp the front filter cover on the power supply faceplate and pull it straight off the
7.
power supply.
Remove the front filter element.
8.
Loosen the screws (using a Phillips (+) screwdriver, number 2) on the bracket located
9.
on the side of the power supply.
Pull the side filter, located on the left side of the AC power supply, out of the power
10.
supply.
Chapter 17: Replacing T640 Router Hardware Components
375