Juniper M320 Hardware Manual page 180

M320 Router Hardware Guide
154
interchangeable, but the rear fan tray is not interchangeable with the front fan trays. The
fan trays are hot-insertable and hot-removable.
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 11 lb (5.1 kg).
To remove a front fan tray (see Figure 76 on page 155):
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 labeled
b.
system. Lift it up and outward to lock it in place to access the lower fan tray.
Loosen the captive screw on each side of the fan tray faceplate.
3.
Grasp the handles and pull the fan tray until it stops.
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.
Press the tabs on both sides of the fan tray and pull the fan tray halfway out of the
5.
chassis.
When the fans stop spinning, place one hand under the fan tray to support it, and pull
6.
the fan tray completely out of the chassis.
on the cable management
PULL
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