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Maintaining MX480 Cooling System Components

 

Maintaining the MX480 Air Filter

Purpose

For optimum cooling, verify the condition of the air filters.

Action

  • Regularly inspect the air filter. A dirty air filter restricts airflow in the unit, producing a negative effect on the ventilation of the chassis. The filter degrades over time. You must replace the filter every 6 months.

    Caution

    Always keep the air filter in place while the device is operating. Because the fans are very powerful, they could pull small bits of wire or other materials into the through the unfiltered air intake. This could damage the components.

  • The shelf life of polyurethane filter varies from two years to five years depending on the storage conditions. Store in a cool, dry, and dark environment. Wrap the media in plastic and store in an environment with relative humidity between 40%- 80% and temperature between 40° F (4° C) to 90° F (32° C). Note that if the material flakes, or becomes brittle when rubbed or deformed, it is no longer usable.

Replacing the MX480 Air Filter

  1. Removing the MX480 Air Filter

  2. Installing the MX480 Air Filter

Removing the MX480 Air Filter

Caution

Do not run the router for more than a few minutes without the air filter in place.

Caution

Always keep the air filter in place while the router is operating, except during replacement. Because the fans are very powerful, they could pull small bits of wire or other materials into the router through the unfiltered air intake. This could damage the router components.

To remove the air filter (see Figure 1):

  1. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis.
  2. Loosen the captive screws on the air filter cover.
  3. Remove the air filter cover.
  4. Slide the air filter out of the chassis.
Figure 1: Removing the Air Filter
Removing the Air
Filter

Installing the MX480 Air Filter

To install the air filter (see Figure 2):

  1. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis.
  2. Locate the up arrow and ensure that the air filter is right side up.
  3. Slide the air filter straight into the chassis until it stops.
  4. Align the captive screws of the air filter cover with the mounting holes on the chassis.
  5. Tighten the captive screws on the air filter cover.
Figure 2: Installing the Air Filter
Installing the Air
Filter

Maintaining the MX480 Fan Tray

Purpose

For optimum cooling, verify the condition of the fans.

Action

  • Monitor the status of the fans. A fan tray contains multiple fans that work in unison to cool the router components. If one fan fails, the host subsystem adjusts the speed of the remaining fans to maintain proper cooling. A red alarm is triggered when a fan fails, and a yellow alarm and red alarm is triggered when a fan tray is removed.

  • To display the status of the cooling system, issue the show chassis environment command. The output is similar to the following:

    user@host> show chassis environment

Replacing the MX480 Fan Tray

  1. Removing the MX480 Fan Tray

  2. Installing the MX480 Fan Tray

Removing the MX480 Fan Tray

Note

To prevent overheating, install the replacement fan tray immediately after removing the existing fan tray.

To remove the fan tray (see Figure 3):

  1. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis.
  2. Loosen the captive screws on the fan tray faceplate.
  3. Grasp the fan tray handle, and pull it out approximately 1 to 3 inches.Warning

    To avoid injury, keep tools and your fingers away from the fans as you slide the fan module out of the chassis. The fans might still be spinning.

  4. Press the latch located on the inside of the fan tray to release it from the chassis.
  5. Place one hand under the fan tray to support it, and pull the fan tray completely out of the chassis.
Figure 3: Removing the Fan Tray
Removing the Fan Tray

Installing the MX480 Fan Tray

To install the fan tray (see Figure 4):

  1. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis.
  2. Grasp the fan tray 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.
  3. Tighten the captive screws on the fan tray faceplate to secure it in the chassis.
Figure 4: Installing the Fan Tray
Installing the Fan
Tray