Juniper SRX5800 Hardware Manual page 287

To remove a DC power supply (see
1. Switch off the dedicated customer site circuit breaker for the power supply being removed. Follow
your site's procedures for ESD.
2. Make sure that the voltage across the DC power source cable leads is 0 V and that there is no chance
that the cables might become active during the removal process. If the services gateway is equipped
with high-capacity DC power supplies, check both pairs of DC leads to make sure that the voltage is
0 V.
3. Verify that the INPUT OK LEDs on the power supply to be removed are not lit.
4. Attach an ESD grounding strap to your bare wrist, and connect the strap to one of the ESD points on
the chassis.
5. Move the DC circuit breaker on the power supply faceplate to the off (O) position.
6. Remove the clear plastic cover protecting the terminal studs on the faceplate.
7. Remove the nuts and washers from the terminal studs. (Use a 7/16-in. nut driver or socket wrench.)
8. Remove the cable lugs from the terminal studs.
9. Loosen the captive screw on the cable restraint on the lower edge of the power supply faceplate.
10. Carefully move the power cables out of the way.
11. While grasping the handle on the power supply faceplate with one hand, use your other hand to pull
the spring-loaded locking pin in the release lever away from the chassis and turn the release lever
counterclockwise until it stops.
12. Let go of the locking pin in the release lever. Ensure that the pin is seated inside the corresponding
hole in the chassis.
13. Pull the power supply straight out of the chassis. The power supply can weigh up to 12 lb (5.5 kg). Be
prepared to accept its full weight.
Figure 124 on page 289):
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