Replacing A T640 Fan Tray; Removing A T640 Front Fan Tray - Juniper T640 Hardware Manual

Replacing a T640 Fan Tray

Copyright © 2010, Juniper Networks, Inc.
The T640 router has two front fan trays and one rear fan tray. The front fan trays install
horizontally in the front of the chassis. Each front fan tray contains six fans. The two front
fan trays are interchangeable, but the rear fan tray is not interchangeable with the front
fan trays. The fan trays are hot-insertable and hot-removable.
Removing a T640 Front Fan Tray on page 187
1.
2. Installing a T640 Front Fan Tray on page 188
Removing a T640 Rear Fan Tray on page 189
3.
Installing a T640 Rear Fan Tray on page 190
4.

Removing a T640 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 front fan tray (see Figure 89 on page 188):
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.
If you are removing the lower fan tray, perform the following steps:
2.
Unwrap any PIC cables from the spools on the cable management system and
a.
remove the cables from the tray. Arrange the cables so that they do not block the
front of 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.
Simultaneously pull the two releases on the cable management system. Lift it up
b.
and outward to lock it in place to access the lower fan tray.
Loosen the captive screws on the corners of the fan tray faceplate.
3.
Grasp the handles and pull the fan tray halfway out of the chassis.
4.
WARNING: To avoid injury, keep tools and your fingers away from the fans
as you slide the fan tray out of the chassis. The fans might still be spinning.
When the fans stop spinning, place one hand under the fan tray to support it, and pull
5.
the fan tray completely out of the chassis.
Chapter 17: Replacing T640 Router Hardware Components
187