Removing The Standard Upper Front Fan Tray; Figure 122: Installing A Quiet Lower Front Fan Tray; Figure 123: Removing A Standard Upper Front Fan Tray - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
238

Figure 122: Installing a Quiet Lower Front Fan Tray

Removing the Standard Upper Front Fan Tray

The upper front fan tray is located above the FPC card cage. Each standard front fan tray
weighs about 18.6 lb (8.4 kg). The fan trays are hot-removable.
To remove a standard upper front fan tray (see
Attach an electrostatic discharge (ESD) grounding strap to your wrist, and connect
1.
the strap to one of the ESD points on the chassis.
Loosen the captive screws on the corners of the fan tray faceplate.
2.
Grasp the handles and pull the fan tray halfway out of the chassis.
3.
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
4.
the fan tray completely out of the chassis.

Figure 123: Removing a Standard Upper Front Fan Tray

Figure 123 on page 238):
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