Installing The T640 Standard Lower Front Fan Tray; Replacing The T640 Standard Upper Front Fan Tray; Removing The T640 Standard Upper Front Fan Tray - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
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Replacing the T640 Standard Upper Front Fan Tray

232
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
7.
the fan tray completely out of the chassis.

Installing the T640 Standard Lower Front Fan Tray

To install a standard lower front fan tray:
Attach an electrostatic discharge (ESD) grounding strap to your wrist, and connect
1.
the strap to one of the ESD points on the chassis.
Grasp the fan tray by its handles and insert it straight into the chassis.
2.
Tighten the captive screws on each side of the fan tray faceplate to secure it in the
3.
chassis.
Unlock the cable management system and lower it to the fully lowered position.
4.
Rearrange the PIC cables in the cable management system. For more information
5.
about proper cable arrangement, see
page 191.
T640 Cooling System Description on page 75
Maintaining the T640 Fan Trays on page 181
Troubleshooting the T640 Cooling System on page 203
T640 Preventing Electrostatic Discharge Damage on page 386
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 232
Installing the T640 Standard Upper Front Fan Tray on page 233
2.

Removing the T640 Standard Upper Front Fan Tray

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.
"Maintaining T640 PICs and PIC Cables" on
Figure 118 on page 233):
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