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Replacing an M120 Fan Tray
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
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 Figure 1 and Figure 2, which illustrate the upper front fan tray and lower rear fan tray):
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- If removing the lower front fan tray, simultaneously pull the two releases labeled PULL 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.
- Grasp the handle and pull the fan tray out approximately
1 to 3 inches.
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.
- 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.
Figure 1: Removing an M120 Upper Front Fan Tray
Figure 2: Removing an M120 Lower Rear Fan Tray
Installing an M120 Fan Tray
To install a fan tray (see Figure 3 and Figure 4):
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- Grasp the fan tray by its handle and insert it straight into the chassis. Note the correct orientation by the "this side up" label on the top surface of the fan tray.
- Tighten the captive screws on each side of the fan tray faceplate to secure it in the chassis.
- Lower the cable management system back into position, if necessary.
Figure 3: Installing an M120 Upper Front Fan Tray
Figure 4: Installing an M120 Lower Rear Fan Tray
