Reinstalling Components in the Chassis After Installing the M120 Router Without a Mechanical Lift

After the router is installed in the rack, you reinstall the removed components before booting and configuring the router. Reinstall the components in the chassis, first in the rear and then in the front:

1. Reinstalling CBs
2. Reinstalling the FEBs
3. Reinstalling the Power Supplies
4. Reinstalling FPCs
5. Reinstalling a CFPC
6. Reinstalling the Fan Trays
7. Reinstalling the Cable Management System

Reinstalling CBs

To reinstall CBs (see Figure 1):

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
2. Carefully align the sides of the CB with the guides inside the chassis.
3. Slide the CB into the chassis, carefully ensuring that it is correctly aligned.
4. Grasp both ejector handles and rotate them simultaneously clockwise until the CB is fully seated.
5. Tighten the captive screws on the ejector handles, using a Phillips (+) screwdriver, number 2.
6. Repeat the procedure to reinstall the remaining CB.

Figure 1: Reinstalling a CB After Installing the M120 Router

Reinstalling the FEBs

To reinstall the FEBs (see Figure 2):

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
2. Place one hand underneath the FEB to support it. With the other hand, hold one of the ejector handles on the FEB faceplate.
3. Carefully align the sides of the FEB with the guides inside the chassis.
4. Carefully slide the FEB into the chassis, ensuring that it is correctly aligned.
5. Grasp both ejector handles and press them inward to seat the FEB.
6. Tighten the captive screws on the ejector handles.
7. Repeat the procedure for each of the remaining FEBs.

Figure 2: Reinstalling a FEB After Installing the M120 Router

Reinstalling the Power Supplies

Reinstall the left power supply first and then the right power supply. To reinstall AC or DC power supplies (see Figure 3):

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
2. Move the power switch on the power supply faceplate to the standby position, for the AC power supply. For a DC power supply, switch the circuit breaker on the power supply faceplate to the off position (O).
3. Using both hands, slide the power supply into the chassis until you feel resistance.
4. Firmly push the power supply into the chassis until it comes to a stop. The power supply faceplate should be flush with any adjacent power supply faceplates.
5. Tighten the captive screws on the top and bottom flanges of the power supply faceplate to secure the power supply in the chassis.
6. Repeat the procedure for the remaining power supply.

Figure 3: Reinstalling a Power Supply After Installing the M120 Router

Reinstalling FPCs

To reinstall an FPC (see Figure 4):

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
2. Using the list you created when you removed the FPCs, locate the slot in the FPC card cage in which you plan to install the FPC.
3. Ensure that the FPC is right-side up, with the text on the faceplate of the FPC facing upward.
4. Lift the FPC into place and carefully align first the bottom, then the top of the FPC with the guides inside the card cage.

   Caution: When the FPC is out of the chassis, do not hold it by the ejector handles, bus bars, or edge connectors. They cannot support its weight.

5. Slide the FPC all the way into the card cage until you feel resistance.
6. Grasp both ejector handles and rotate them simultaneously clockwise until the FPC is fully seated.
7. Repeat the procedure to reinstall each remaining FPC.

Figure 4: Reinstalling an FPC After Installing the M120 Router

Reinstalling a CFPC

To reinstall a CFPC (see Figure 5):

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
2. Identify the slot in which the CFPC will be installed.
3. Verify that the transceiver has a rubber safety cap covering the PIC transceiver. If it does not, cover the transceiver with a safety cap.
4. Ensure that the CFPC is right-side up, with the text on the faceplate of the CFPC facing upward.
5. Lift the CFPC into place and carefully align first the bottom, then the top of the CFPC with the guides inside the card cage.
6. Slide the CFPC all the way into the card cage until you feel resistance.
7. Pull the end of the ejector lever away from the CFPC faceplate, and hold the lever out while continuing to push on the CFPC faceplate to further install it into the chassis.
8. When the CFPC is about 0.5 in (1 cm) from being fully inserted, release the ejector level and gently push on the CFPC faceplate until you hear a click as the CFPC contacts the midplane. The ejector lever engages and closes automatically.
9. Remove the rubber safety cap from the transceiver on the CFPC faceplate.
10. Insert the appropriate cable into the transceiver on the CFPC faceplate.
11. Use one of the following methods to bring the CFPC online:
    • Press and hold the CFPC online/offline button until the green STATUS LED next to the button lights steadily, in about 5 seconds. The LEDs and online/offline button for each CFPC are located directly above it on the craft interface.
    • Issue the following CLI command:
      
      

      user@host>request chassis fpc slot slot-number online

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

Caution: After the OK LED lights steadily, wait at least 30 seconds before removing the CFPC again or removing the CFPC from the other slot.

You can also verify correct CFPC functioning by issuing the show chassis fpc command as described in Maintaining M120 FPCs and CFPCs.

Figure 5: Reinstalling a CFPC After Installing the M120 Router

Reinstalling the Fan Trays

To reinstall the fan trays (see Figure 6):

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
2. 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.
3. Tighten the captive screw on each side of the fan tray faceplate to secure it in the chassis.
4. Lower the cable management system back into position, if necessary.
5. Repeat the procedure to reinstall the remaining fan trays.

Figure 6: Reinstalling a Front Fan Tray After Installing the M120 Router

Reinstalling the Cable Management System

To reinstall the cable management system:

1. Position the cable management system on the studs on the lower front of the chassis.
2. Insert the nuts on the corners in the cable management system onto the studs on the chassis.
3. Using a 3/8-in. nut driver, tighten the nuts securely.