4. Switch off the customer site circuit breakers to the power supply. Make sure that the
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.
5. Disconnect the AC power cord from the AC power source.
6. Reattach the ESD grounding strap to one of the ESD points on the chassis.
7. Grasp the front filter cover on the power supply faceplate and pull it straight off the
power supply.
8. Remove the front filter element.
9. Loosen the screws (using a Phillips (+) screwdriver, number 2) on the bracket located
on the side of the power supply.
10. Pull the side filter, located on the left side of the AC power supply, out of the power
supply.
Figure 207: Removing the AC Power Supply Side Air Filter
g004964
Air filterAir filter bracket
Installing a Side Air Filter on a T640 AC Power Supply
To install the side AC power supply filter:
1. Verify that the customer site circuit breakers to the power supply is off, that that the
voltage across the AC power source cord is 0 V, and that there is no chance that the
AC power cord might become active during the replacement.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
the strap to one of the ESD points on the chassis.
Copyright © 2017, Juniper Networks, Inc.394
T640 Core Router Hardware Guide
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