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Circuit Breaker Box
The circuit breaker box is located on the rear
of the chassis above the right power supply, as shown in Figure 1. It weighs about 6 lb
Caution: Do not remove the grounding lug from the grounding points on
the chassis during this procedure.
To remove the circuit breaker box, follow this procedure (see Figure 10):
- On the
console or other management device connected to the master Routing Engine,
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
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
five minutes after the request system halt command has been issued.
For each power supply, press the power switch on the circuit breaker box to
the OFF (O) 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 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 the strap to one of the ESD points on the chassis. For more information about ESD, see the hardware guide for your routing platform.
Using a Phillips screwdriver, loosen and remove the screws securing
the protective shield over the terminal studs on the circuit breaker box.
Remove the cover.
Using a 7/16-in. nut driver or wrench, loosen the outer nut securing
the cable lug to each terminal stud. Remove the outer nuts and washers, leaving
the inner nut and washer on each stud.
Caution: Do not substitute a metric nut driver or wrench. A tool that does not
fit the nuts exactly can damage them. If a 7/16-in. tool is not available,
use pliers or an adjustable wrench.
Slide the cable lug off of each terminal stud. Leave the inner washer
and nut on each stud.
- Remove the rear lower impeller assembly by loosening the
thumbscrew at each corner and pulling the impeller assembly straight
out of the chassis. For complete instructions, see the hardware guide for your routing platform.
- Using a Phillips screwdriver, loosen and remove
the screw at each corner of the circuit breaker box. Loosen the thumbscrews
at the top and bottom edge of the box.
- Pull the circuit breaker box straight out of the
Figure 10: Removing
the Circuit Breaker Box
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