Replacing an M120 Air Filter

Removing the M120 Air Filter

The air filter is located in the front of the chassis below the FPC card cage. The air filter weighs approximately 1 lb (0.5 kg).

To remove the air filter (see Figure 1):

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
2. Unwrap any PIC cables from the spools on the cable management system and 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.

3. Simultaneously pull the two releases labeled PULL on the cable management system. Lift it up and outward to lock it in place to access the air filter.
4. Loosen the captive screws on either side of the air filter faceplate and remove the faceplate.
5. Press back and down on the filter to release it from the hooks, then slide it straight out of the chassis.

Figure 1: Removing the M120 Air Filter

Installing the M120 Air Filter

To install the front air filter (see Figure 2):

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
2. Insert the air filter element into the chassis by sliding it straight into the chassis until it stops.
3. While pushing the air filter straight back into the chassis, lift the front edge of the air filter to secure it under the hooks.
4. Reinstall the air filter faceplate onto the chassis, and fasten the captive screws on both sides.
5. Lower the cable management system back into position.
6. Rearrange the PIC cables in the cable management system. For more information about proper cable arrangement, see Maintaining M120 PICs and PIC Cables.

Figure 2: Installing the M120 Front Air Filter