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 the power supply faceplate.
3. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the
ESD points on the chassis.
4. Switch the circuit breaker on the power supply faceplate to the off position (O).
5. Remove the power cable from the DC power source.
6. Remove the clear plastic cover protecting the terminal studs on the faceplate.
7. Remove the nut and washer from the terminal studs (see “Disconnecting Power
Cables from the DC Power Supply” on page 246). (Use a 3/8–in. nut driver or pliers.)
8. Remove the cable lug from the terminal studs.
9. Loosen the captive screw on the cable restraint on the lower edge of the power supply
faceplate.
10. Carefully move the power cable out of the way.
11. Attach the lug on the replacement power cable to the terminal studs, making sure
the cable is not touching or in the way of any router components.
12. Secure the power cable lugs to the terminal studs, first with the flat washer, then with
the nut. Apply between 12 lb-in. (1.4 Nm) and 15 lb-in. (1.7 Nm) of torque to each nut,
(see “Connecting Power Cables to the DC Power Supply” on page 251
13. Route the power cable through the cable restraint.
14. Tighten the cable restraint captive screw to hold the power cable in place.
15. Replace the clear plastic cover over the terminal studs on the faceplate.
16. Attach the power cable to the DC power source.
Copyright © 2018, Juniper Networks, Inc.252
M120 Multiservice Edge Router Hardware Guide
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