Juniper Networks M160 Installing a Power Supply, Rear of Power Supply Showing Midplane Connectors

Replacing Hardware Components

Figure 102: Rear of Power Supply Showing Midplane Connectors

Power supply input connectors

Power supply output connectors

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Installing a Power Supply

To install a power supply, follow this procedure (see Figure 103):

1.Verify that there is no power flowing to the power supply from the 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.Verify that the power switch for the power supply (located 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.Place one hand under the power supply and grasp a handle on the faceplate with the other hand. Slide the power supply into the chassis until it contacts the midplane.

5.Starting with the bottom screws, tighten (but do not overtighten) the thumbscrew at each corner of the power supply faceplate.

6.Press the switch on the corresponding circuit breaker to the ON ( ) position. Verify that on the power supply faceplate the green LED labeled CB ON lights steadily, the blue LED labeled OUTPUT OK blinks momentarily, then lights steadily, and the amber LED labeled CB OFF does not light.

NOTE: After powering off a power supply, wait at least 60 seconds before turning it back on. After powering on a power supply, wait at least 60 seconds before turning it off.

Replacing Power System Components 199