Removing the T640 Standard Lower Front Fan Tray
The upper front fan tray is located above the FPC card cage, and the lower front fan tray
is located below the front air filter. Each fan tray weighs about 18.6 lb (8.4 kg).
To remove a standard lower front fan tray:
1. Attach an electrostatic discharge (ESD) grounding strap to your wrist, and connect
the strap to one of the ESD points on the chassis.
2. Unwrap any PIC cables from the spools on the cable management system and remove
the cables from the tray. Arrange the cables so that they do not block the cable
management system and tray, and secure them with temporary fasteners so that
they are not supporting their own weight as they hang from the connector.
CAUTION: Do not let fiber-optic cable hang free from the connector. Do
not allow fastened loops of cable to dangle, which stresses the cable at
the fastening point.
3. Simultaneously pull the two releases on the cable management system. Lift it up and
outward to lock it in place to access the lower fan tray.
4. Rearrange the PIC cables in the cable management system. For more information
about proper cable arrangement, see “Maintaining T640 PICs and PIC Cables” on
page 454.
5. Loosen the captive screws on the corners of the fan tray faceplate.
6. Grasp the handles and pull the fan tray halfway out of the chassis.
WARNING: To avoid injury, keep tools and your fingers away from the fans
asyou slide the fan tray out of the chassis. The fansmight still be spinning.
7. When the fans stop spinning, place one hand under the fan tray to support it and pull
the fan tray completely out of the chassis.
Installing the T640 Standard Lower Front Fan Tray
To install a standard lower front fan tray:
1. Attach an electrostatic discharge (ESD) grounding strap to your wrist, and connect
the strap to one of the ESD points on the chassis.
2. Grasp the fan tray by its handles and insert it straight into the chassis.
287Copyright © 2017, Juniper Networks, Inc.
Chapter 26: Replacing Cooling System Components
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