CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled (+) and (–) to indicate
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.
7. Remove the cable lugs from the terminal studs.
8. Loosen the captive screws on the cable restraints on the right edge of the power
supply faceplate.
9. Carefully move the power cables out of the way.
10. Loosen the captive screws on the lower corners of the power supply faceplate
completely. Twist the ejector handles on the upper corners of the faceplate
counterclockwise to unseat the power supply.
11. Twist the ejector handles on the upper corners of the faceplate counterclockwise to
unseat the power supply.
12. Grasp the handle on the power supply faceplate, and pull firmly to start removing the
power supply. Slide it halfway out of the chassis (see Figure 171 on page 352).
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.
13. Place one hand underneath the power supply to support it, and slide it completely
out of the chassis.
WARNING: Do not touch the power connectors on the rear of the power
supply (see Figure172 on page 352). Theycan contain dangerousvoltages.
351Copyright © 2017, Juniper Networks, Inc.
Chapter 29: Replacing Power System Components
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