Router - Juniper M40E Hardware Manual

Copyright © 2010, Juniper Networks, Inc.
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Removing the Circuit Breaker Box from a DC-Powered M40e Router
The circuit breaker box on a DC-powered router is located on the rear of the chassis above
the right power supply, as shown in "M40e Chassis Description" on page 8. It weighs
about 6 lb (2.7 kg).
CAUTION: Do not remove the grounding lug from the grounding points on
the chassis during this procedure.
To remove the circuit breaker box (see Figure 123 on page 220):
On the console or other management device connected to the master Routing Engine,
1.
enter CLI operational mode and issue the following command to shut down the router
software. (If two Routing Engines are installed, also issue the command on the backup
Routing Engine.)
user@host> request system halt
Wait until a message appears on the console confirming that the operating system
has halted.
For more information about the command, see the Junos System Basics and Services
Command Reference.
NOTE: The SFM might continue forwarding traffic for approximately 5
minutes after the
For each power supply, press the power switch on the circuit breaker box to the
2.
position.
NOTE: If you are power cycling the power supply rather than shutting it
off for a time, wait at least 60 seconds after turning it off before turning
it back on. If you need to power it off again, wait for at least 60 seconds
after powering it on.
Shut off the power flowing from both external power sources, so that the voltage
3.
across the leads of the power cables is 0 V. Ensure that there is no chance that the
cable leads might become active during the procedure.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
4.
the strap to one of the ESD points on the chassis. For more information about ESD,
see "Preventing Electrostatic Discharge Damage to an M Series, MX Series, or T Series
Router" on page 232.
Using a Phillips screwdriver, loosen and remove the screws securing the protective
5.
shield over the terminal studs on the circuit breaker box. Remove the cover.
Chapter 16: Replacing M40e Hardware Components
request system halt command has been issued.
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OFF O
219