Juniper Networks M160 manual Replacing Power System Components, Replacing the Circuit Breaker Box

Replacing Hardware Components

CAUTION: Avoid bending fiber-optic cable beyond its minimum bend radius. An arc smaller than a few inches in diameter can damage the cable and cause problems that are difficult to diagnose.

7.Verify that the status LEDs on the PIC faceplate indicate that the SFP is functioning correctly (there is an LED for each SFP port). For more information about the PIC LEDs, see the M160 Internet Router PIC Guide. You can also verify PIC functioning by issuing the show chassis fpc pic-statuscommand described in “Maintaining PICs and PIC Cables” on page 134.

Replacing Power System Components

For instructions on replacing power system components, see the following sections:

Replacing the Circuit Breaker Box on page 193

Replacing a Power Supply on page 197

Disconnecting and Connecting Power on page 200

Replacing a Fuse on page 204

Replacing the Circuit Breaker Box

The circuit breaker box is field-replaceable, but you must power off the router before removing or replacing it.

To replace the circuit breaker box, perform the following procedures:

Removing the Circuit Breaker Box on page 193

Installing the Circuit Breaker Box on page 195

Removing the Circuit Breaker Box

The circuit breaker box is located on the rear of the chassis above the right power supply, as shown in Figure 2. 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, follow this procedure (see Figure 99):

Replacing Power System Components 193