Juniper Networks M160 manual Installing the Circuit Breaker Box, Removing the Circuit Breaker Box

Replacing Hardware Components

8.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 “Removing the Rear Lower Impeller Assembly” on page 155.

9.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.

10.Pull the circuit breaker box straight out of the chassis.

Figure 99: Removing the Circuit Breaker Box

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Installing the Circuit Breaker Box

To install the circuit breaker box, follow this procedure (see Figure 100):

1.Verify that there is no power flowing from either external power source, 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.

2.For each power supply, verify that the power switch on the circuit breaker box is in the OFF (O) position.

3.Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis. Make sure the router is attached to a proper earth ground. For more information about ESD, see “Preventing Electrostatic Discharge Damage” on page 226.

4.Align the guide pin on the back of the circuit breaker box with the opening in the chassis, then push the circuit breaker box straight in.

5.Tighten the thumbscrews at the top and bottom edge of the circuit breaker box. Using a Phillips screwdriver, tighten the screw at each corner of the box.

6.Slide the power cable lugs for both power sources onto the terminal studs on the circuit breaker box:

Replacing Power System Components 195