To remove an AC power supply (see Figure 19 on page 24):
1. Switch off the dedicated customer site circuit breaker for the power supply, and
remove the power cord from the AC power source. Follow the instructions for your
site.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
the strap to one of the ESD points on the chassis.
3. Move the AC input switch next to the appliance inlet on the power supply to the off
(O) position.
4. Remove the power cord from the power supply.
5. Unscrew the captive screws on the bottom edge of the power supply.
6. Pull the power supply straight out of the chassis.
Installing the MX240 and MX480 AC High-Capacity Power Supplies
NOTE: Upgrade adjacent power supplies; remove an existing power supply,
then install the high-capacity power supply.
NOTE: During the upgrade process, you can simultaneously run existing and
high-capacity power supplies. However, it is recommended to upgrade all
power supplies to high-capacity power supplies.
To install an AC power supply (see Figure 13 on page 16):
1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
the strap to one of the ESD points on the chassis.
2. Move the AC input switch next to the appliance inlet on the power supply to the off (O)
position.
3. Using both hands, slide the power supply straight into the chassis until the power
supply is fully seated in the chassis slot. The power supply faceplate should be flush
with any adjacent power supply faceplate or blank installed in the power supply slot.
4. Tighten both captive screws at the bottom of the power supply.
5. Attach the power cord to the power supply.
6. Attach the power cord to the AC power source, and switch on the dedicated customer
site circuit breaker. Follow the instructions for your site.
7. Move the AC input switch next to the appliance inlet on the power supply to the on
(|) position and observe the status LEDs on the power supply faceplate. If the power
supply is correctly installed and functioning normally, the AC OK and DC OK LEDs light
steadily and the PS FAIL LED is not lit.
15Copyright © 2010, Juniper Networks, Inc.
Installing the MX240 and MX480 AC High-Capacity Power Supplies
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