Removing an M120 FPC

The router holds up to four FPCs, which are installed vertically in the front of the router. An empty FPC weighs 9.0 lb (4.0 kg). A fully configured FPC can weigh up to 12.3 lb (5.6 kg).

To remove an FPC, follow this procedure (see Figure 14):

1. Have ready a replacement FPC or FPC blank panel and an antistatic mat for the FPC. Also have ready rubber safety caps for each PIC using an optical interface on the FPC that you are removing.
2. Attach an ESD wrist strap to your bare wrist and connect the strap to one of the ESD points on the chassis.
3. Label the cables connected to each PIC on the FPC so that you can later reconnect the cables to the correct PICs.
4. Use one of the following methods to take the FPC offline:
   • Press and hold the FPC online/offline button. The green STATUS LED next to the button begins to blink. Hold the button down until the LED goes out. The LEDs and online/offline button for each FPC are located directly above it on the craft interface. The LEDs and online/offline button for each FPC are located directly above it on the craft interface.
   • Issue the following CLI command:
     user@host>request chassis fpc slot slot-number offline

     For more information about the command, see the JUNOS System Basics and Services Command Reference.

5. Disconnect the cables from the PICs installed in the FPC. If a PIC uses fiber-optic cable, immediately cover each transceiver and the end of each cable with a rubber safety cap. Arrange the disconnected cables in the cable management system, to prevent the cables from developing stress points.

   Warning: Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cable connected to a transceiver emit laser light that can damage your eyes.

   Caution: Do not leave a fiber-optic transceiver uncovered except when inserting or removing cable. The safety cap keeps the port clean and prevents accidental exposure to laser light.

   Caution: Avoid bending fiber-optic cable beyond its minimum bend radius. An arc smaller than a few inches in diameter can damage the cable and cause problems that are difficult to diagnose.

6. Simultaneously turn both the ejector handles counterclockwise to unseat the FPC.
7. Grasp the handles and slide the FPC straight out of the card cage halfway.
8. Place one hand around the front of the FPC (the PIC housing) and the other hand under it to support it. Slide the FPC completely out of the chassis, and place it on the antistatic mat or in the electrostatic bag.
9. If necessary, remove each installed PIC from the FPC. For information on removing a PIC, see the M120 Internet Router Hardware Guide.
10. After you remove each PIC, immediately place it on an antistatic mat or in an electrostatic bag.
11. If you are not reinstalling a FPC into the emptied FPC slot within a short time, install a blank FPC panel over the slot to maintain proper airflow in the FPC card cage.

    Caution: After removing an FPC from the chassis, wait at least 30 seconds before reinserting it, removing an FPC from a different slot, or inserting an FPC into a different slot.

Figure 14: Removing an M120 FPC