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Maintaining MX204 Cooling System Components

 

Maintaining the MX204 Fan Module

Purpose

For optimum cooling, verify the condition of the fans.

Action

  • Monitor the status of the fans. A fan module contains multiple fans that work in unison to cool the router components. If one fan fails, the router adjusts the speed of the remaining fans to maintain proper cooling. A red alarm is triggered when a fan fails, and when a fan module 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 an MX204 Fan Module

Removing an MX204 Fan Module

Note

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

To remove the fan module (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 screw on the fan module faceplate (use a number-2 Phillips screwdriver).
  3. Hold and press the latch located on the inside of the fan module to release it from the chassis.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. Place one hand under the fan module to support it, and pull the fan module completely out of the chassis.
Figure 1: Removing the Fan Module
Removing the Fan Module

Installing an MX204 Fan Module

To install the fan module (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. Grasp the fan module by the handle, and place one hand under the fan module for support.
  3. Place the fan module on the respective slot, and carefully push the fan module into the chassis until the socket lock snaps into place and holds it.
  4. Using a number-2 Phillips screwdriver, turn the locking screw on the fan module faceplate until it is tight and secured.
Figure 2: Installing the Fan Module
Installing the Fan
Module