Juniper MX480 Hardware Manual page 389

CAUTION:
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.
NOTE: After powering off a power supply, wait at least 60 seconds before turning it back on.
To remove an AC power supply (see
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. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other
end of the strap to the ESD point 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.
Figure 139: Removing an AC Power Supply
To maintain proper cooling and prevent thermal shutdown of the operating
Figure 139 on page 393):
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