Replacing An M120 Routing Engine; Removing An M120 Routing Engine - Juniper Networks Hardware Manual

Replacing an M120 Routing Engine

Copyright © 2010, Juniper Networks, Inc.
All manuals and user guides at all-guides.com
To replace a Routing Engine, perform the following procedures:
Removing an M120 Routing Engine on page 147
Installing an M120 Routing Engine on page 148

Removing an M120 Routing Engine

The router can have one or two Routing Engines. They are located within the CB in the
rear of the chassis on either side of the FEBs in the slots marked
Routing Engine weighs approximately 2.4 lb (1.1 kg).
CAUTION: Before you replace a Routing Engine, 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 Routing Engine to be replaced is currently functioning as
the master Routing engine, switch it to be the backup before removing it. See
"Taking the M120 Host Subsystem Offline" on page 140.
To remove a Routing Engine from a CB (see Figure 72 on page 148):
Take the host subsystem offline as described in "Taking the M120 Host Subsystem
1.
Offline" on 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.
Press the red tabs on the ejector handles on both sides of the Routing Engine faceplate.
4.
Flip the ejector handles outward to unseat the Routing Engine.
5.
Grasp the Routing Engine by the ejector handles and slide it about halfway out of the
6.
chassis.
Place one hand underneath the Routing Engine to support it and slide it completely
7.
out of the chassis.
Place the Routing Engine on the antistatic mat.
8.
NOTE: To maintain proper airflow through the chassis, do not leave a CB
installed in the chassis without a Routing Engine for extended periods of
time. If a Routing Engine is removed, a replacement Routing Engine should
be installed as soon as possible.
Chapter 14: Replacing M120 Hardware Components
and
CB0
. Each
CB1
147