Installing The Circuit Breaker Box In A Dc-Powered M40E Router; Figure 123: Removing The Circuit Breaker Box - Juniper M40E Hardware Manual

M40e Multiservice Edge Router Hardware Guide
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Using a 7/16-in. nut driver or wrench, loosen the outer nut securing the cable lug to
6.
each terminal stud. Remove the outer nuts and washers, leaving the inner nut and
washer on each stud.
Slide the cable lug off of each terminal stud. Leave the inner washer and nut on each
7.
stud.
Remove the rear lower impeller assembly by loosening the thumbscrew at each corner
8.
and pulling the impeller assembly straight out of the chassis. For complete instructions,
see "Removing the M40e Rear Lower Impeller Assembly" on page 176.
Using a Phillips screwdriver, loosen and remove the screw at each corner of the circuit
9.
breaker box. Loosen the thumbscrews at the top and bottom edge of the box.
Pull the circuit breaker box straight out of the chassis.
10.

Figure 123: Removing the Circuit Breaker Box

Installing the Circuit Breaker Box in a DC-Powered M40e Router

To install the circuit breaker box (see Figure 124 on page 222):
Verify that there is no power flowing from either external power source, so that the
1.
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.
For each power supply, verify that the power switch on the circuit breaker box is in the
2.
( ) position.
OFF O
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. For more information about ESD,
see "Preventing Electrostatic Discharge Damage to an M Series, MX Series, or T Series
Router" on page 232.
Align the guide pin on the back of the circuit breaker box with the opening in the chassis,
4.
then push the circuit breaker box straight in.
Tighten the thumbscrews at the top and bottom edge of the circuit breaker box. Using
5.
a Phillips screwdriver, tighten the screw at each corner of the box.
Slide the power cable lugs for both power sources onto the terminal studs on the
6.
circuit breaker box:
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