3. Tighten the captive screws on each side of the fan tray faceplate to secure it in the
chassis.
4. Unlock the cable management system and lower it to the fully lowered position.
5. 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.
Related
Documentation
T640 Cooling System Description on page 31•
• Maintaining the T640 Fan Trays on page 445
• Troubleshooting the T640 Cooling System on page 469
• T640 Preventing Electrostatic Discharge Damage on page 506
Replacing the T640 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-insertable and hot-removable. The
standard upper and lower fan trays are interchangeable with each other.
1.
Removing the T640 Standard Upper Front Fan Tray on page 288
2.
Installing the T640 Standard Upper Front Fan Tray on page 289
Removing the T640 Standard Upper Front Fan Tray
To remove a standard upper front fan tray (see Figure 130 on page 289):
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. 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.
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.
4. 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.
Copyright © 2017, Juniper Networks, Inc.288
T640 Core Router Hardware Guide
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