Replacing An M120 Fan Tray; Removing An M120 Fan Tray - Juniper M120 Hardware Manual

M120 Multiservice Edge Router Hardware Guide

Replacing an M120 Fan Tray

Removing an M120 Fan Tray

190
Maintaining the M120 Air Filter on page 263
Troubleshooting the M120 Cooling System on page 286
The router has two front fan trays and two rear fan trays. Both the front and rear fan trays
install horizontally above and below the FPC card cage. Each front fan tray contains eight
fans. The two front fan trays are interchangeable, and the two rear fans trays are
interchangeable, but the front and rear fan trays are not interchangeable. The fan trays
are hot-insertable and hot-removable.
To replace a fan tray, perform the following procedures:
Removing an M120 Fan Tray on page 190
Installing an M120 Fan Tray on page 192
In the front of the chassis, the upper fan tray is located above the FPC card cage, and the
lower fan tray is located below the FPC card cage. Each fan tray weighs about 7 lb (3.2 kg).
In the rear of the chassis, the upper fan tray is located above the rear card cage, and the
lower fan tray is located below the rear card cage. Each fan tray weighs about 5.3 lb (2.4
kg).
To remove any fan tray (see
illustrate the upper front fan tray and lower rear fan tray):
Attach an ESD grounding strap to your bare wrist and connect the strap to one of the
1.
ESD points on the chassis.
If removing the lower front fan tray, simultaneously pull the two releases labeled PULL
2.
on the cable management system. Lift it up and outward to lock it in place.
Loosen the captive screw on each side of the fan tray faceplate.
3.
Grasp the handle and pull the fan tray out approximately 1 to 3 inches.
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.
Pause for approximately 15 seconds to allow the fans to stop spinning.
5.
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.
Figure 65 on page 191 and Figure 66 on page 191, which
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