Installing an M120 AC Power Supply
To install an AC power supply (see Figure 97 on page 243):
1. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the
ESD points on the chassis.
2. Move the power switch on the power supply faceplate to the standby position.
3. Using both hands, slide the power supply into the chassis until you feel resistance.
4. Firmly push the power supply into the chassis until it comes to a stop. The power
supply faceplate should be flush with any adjacent power supply faceplates.
5. Tighten the captive screws on the top and bottom flanges of the power supply
faceplate to secure the power supply in the chassis.
6. Insert the appliance coupler end of each power cord into the appliance inlet on the
power supply faceplate.
7. Remove the cable restraint from the lower edge of the power supply faceplate by
removing its retainer screw.
8. Wrap the cable restraint around the power cord, then slide it along the power cord to
a position that enables you to reinstall it in the power supply faceplate.
9. Reinstall the cable restraint by tightening its retainer screw part of the way into the
power supply faceplate.
10. Carefully pull the AC power cords through the cable restraint until you have the desired
amount of slack in the power cord.
11. Tighten the cable restraint retainer screw to hold the power cords in place.
12. Insert the power cord plugs into an AC power source receptacle. Verify that the power
cord does not block access to router components or drape where people could trip
on it.
Copyright © 2018, Juniper Networks, Inc.242
M120 Multiservice Edge Router Hardware Guide
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