Juniper MX204 Hardware Manual page 86

MX204 3D Universal Edge Router Hardware Guide
100
CAUTION: 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.
NOTE: After powering off a power supply, wait at least 60 seconds before
turning it back on.
CAUTION: Do not mix AC and DC power supply modules in the same chassis.
To remove a DC power supply:
Switch off the dedicated customer-site circuit breaker for the power supply being
1.
removed. Follow your site's procedures for ESD.
Make sure that the voltage across the DC power source cable leads is 0 V and that
2.
there is no chance that the cables might become active during the removal process.
Verify that the status LED on the power supply is not lit.
3.
Attach an ESD grounding strap to your bare wrist and connect the strap to one of the
4.
ESD points on the chassis.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
5.
Using a socket screw driver, remove the screw from each of the DC power terminals
6.
(see Figure 48 on page
Remove the cable lugs from the terminals.
7.
Carefully move the power cables out of the way.
8.
Press the latch located on the DC power supply, to release it from the chassis.
9.
Pull the power supply straight out of the chassis (see
10.
101).
Figure 49 on page 101).
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