3. Verify that the INPUT OK LED on the power supply is not lit.
4. Remove the power cable from the external DC power source.
5. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the
ESD points on the chassis.
6. Move the DC circuit breaker on the power supply faceplate to the off (O)position.
7. Remove the clear plastic cover protecting the terminal studs on the faceplate.
8. Remove the nut and washer from each of the terminal studs. (Use a 7/16-in.
[11 mm] nut driver or socket wrench.)
9. Remove the cable lug from the terminal studs.
10. Remove the power cable from the cable restraint, and then carefully move the cable
out of the way.
See Also Preventing Electrostatic Discharge Damage to an MX480 Router on page 484•
• Replacing an MX480 DC Power Supply on page 370
• Connecting an MX480 DC Power Supply Cable on page 227
• MX480 DC Power Supply Description on page 102
Connecting an MX480 DC Power Supply Cable
WARNING: Before performing DC power procedures, ensure that power is
removed from the DC circuit. To ensure that all power is off, locate the circuit
breaker on the panel board that services the DC circuit, switch the circuit
breaker to the off position, and tape the switch handle of the circuit breaker
in the off position.
To connect a power cable for a DC power supply:
1. Locate a replacement powercablethat meets the specifications defined in “DC Power
Cable Specifications for the MX480 Router” on page 173.
2. Verify that a licensed electrician has attached a cable lug to the replacement power
cable.
3. Verify that the INPUT OK LED is off.
Copyright © 2017, Juniper Networks, Inc.378
MX480 3D Universal Edge Router Hardware Guide
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