Juniper MX480 Hardware Manual page 323

Copyright © 2019, Juniper Networks, Inc.
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.
CAUTION: To maintain proper cooling and prevent thermal shutdown of the
operating power supply unit, each power supply slot must contain either a
power supply or a blank panel. If you remove a power supply, you must install
a replacement power supply or a blank panel shortly after the removal.
NOTE: After powering off a power supply, wait at least 60 seconds before
turning it back on.
To remove a DC power supply (see
Switch off the dedicated customer site circuit breaker for the power supply being
1.
removed. Follow your site's procedures for ESD.
Make sure that the voltage across the DC power source cable leads is 0 V and that
2.
there is no chance that the cables might become active during the removal process.
Attach an ESD grounding strap to your bare wrist and connect the strap to one of the
3.
ESD points on the chassis.
Move the DC circuit breaker on the DC power supply faceplate to the off (
4.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
5.
Remove the nut and washer from each of the terminal studs. (Use a 7/16-in. [11 mm]
6.
nut driver or socket wrench.)
Remove the cable lugs from the terminal studs.
7.
Loosen the captive screws on the bottom edge of the power supply faceplate.
8.
Carefully move the power cables out of the way.
9.
Pull the power supply straight out of the chassis.
10.
Chapter 4: Maintaining Components
Figure 138 on page 324):
O ) position.
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