Removing An M120 Ac Power Supply - Juniper Networks Hardware Manual

M120 Multiservice Edge Router Hardware Guide
174
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NOTE: 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.
Removing an M120 AC Power Supply on page 174
Installing an M120 AC Power Supply on page 175

Removing an M120 AC Power Supply

The power supplies are located at the rear of the chassis to the right of the
power supply weighs approximately 8.4 lb (3.8 kg).
CAUTION: Do not leave a power supply slot empty for more than 30 minutes
while the router is operational. For proper airflow, the power supply must
remain in the chassis, or a blank panel must be used in an empty slot.
NOTE: After powering off a power supply, wait at least 60 seconds before
turning it back on.
To remove an AC power supply (see Figure 87 on page 175):
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
1.
the strap to one of the ESD points on the chassis.
Move the power switch on the power supply faceplate to the standby position.
2.
Unplug the power cords from the power source receptacles.
3.
Remove the cable restraint from the lower edge of the power supply faceplate by
4.
removing its retainer screw.
Unplug the power cord from the appliance inlet on the power supply faceplate.
5.
Loosen the captive screw on each flange at the top and bottom of the power supply
6.
faceplate completely.
Grasp the handle on the power supply faceplate and pull firmly. Slide it halfway out
7.
of the chassis.
Place one hand underneath the power supply to support it and slide it completely out
8.
of the chassis.
WARNING: Do not touch the power connectors on the rear of the power
supply (see Figure 88 on page 175). They can contain dangerous voltages.
. Each
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