Replacing An M120 Cb; Removing An M120 Cb - Juniper Networks Hardware Manual

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Replacing an M120 CB

Copyright © 2010, Juniper Networks, Inc.
All manuals and user guides at all-guides.com
M120 Host Subsystem Description on page 18
Maintaining the M120 Host Subsystem on page 104
To replace a CB, perform the following procedures:
Removing an M120 CB on page 143
Installing an M120 CB on page 144

Removing an M120 CB

The router can have one or two CBs. They are located on either side of the FEBs in the
rear of the chassis in the slots marked
approximately 6.9 lb (3.1 kg).
CAUTION: Before you replace a CB, you must take the host subsystem offline.
If there is only one host subsystem, taking the host subsystem offline shuts
down the router. See "Taking the M120 Host Subsystem Offline" on page 140.
CAUTION: If the CB to be replaced is associated with the Routing Engine
currently functioning as the master Routing engine, switch it to the backup
before removing the CB. See "Taking the M120 Host Subsystem Offline" on
page 140.
To remove a CB (see Figure 69 on page 144):
Take the host subsystem offline. See "Taking the M120 Host Subsystem Offline" on
1.
page 140.
Place an electrostatic bag or antistatic mat on a flat, stable surface.
2.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
3.
the strap to one of the ESD points on the chassis.
Loosen the captive screws on the ejector handles, using a Phillips (+) screwdriver,
4.
number 2.
Simultaneously rotate the ejector handles counterclockwise to unseat the CB.
5.
Grasp the ejector handles and slide the CB about halfway out of the chassis.
6.
Place one hand underneath the CB to support it and slide it completely out of the
7.
chassis.
Place the CB on the antistatic mat.
8.
If you are not replacing the CB now, install a blank panel over the empty slot.
9.
Chapter 14: Replacing M120 Hardware Components
and . With an RE installed, each CB weighs
CB0 CB1
143