Juniper T640 Hardware Manual page 385

Copyright © 2017, Juniper Networks, Inc.
CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled
their polarity. There is no standard color coding for DC power cables. The
color coding used by the external DC power source at your site determines
the color coding for the leads on the power cables that attach to the
terminal studs on each power supply.
Remove the cable lugs from the terminal studs.
7.
Loosen the captive screws on the cable restraints on the right edge of the power
8.
supply faceplate.
Carefully move the power cables out of the way.
9.
Loosen the captive screws on the lower corners of the power supply faceplate
10.
completely. Twist the ejector handles on the upper corners of the faceplate
counterclockwise to unseat the power supply.
Twist the ejector handles on the upper corners of the faceplate counterclockwise to
11.
unseat the power supply.
Grasp the handle on the power supply faceplate, and pull firmly to start removing the
12.
power supply. Slide it halfway out of the chassis (see
CAUTION: Each two-input 160-A power supply weighs approximately
23 lb (10.5 kg). Be prepared to support the full weight of the power supply
as you remove it from the router.
Place one hand underneath the power supply to support it, and slide it completely
13.
out of the chassis.
WARNING: Do not touch the power connectors on the rear of the power
supply (see Figure 172 on page
Chapter 29: Replacing Power System Components
and
(+)
Figure 171 on page
352). They can contain dangerous voltages.
to indicate
(–)
352).
351