Juniper EX4500 Hardware Manual page 203

An antistatic bag or an antistatic mat
Replacement power supply or a cover panel for the power supply slot
CAUTION:
is operational. Either replace the power supply promptly or install a cover panel over
the empty slot.
To remove a power supply from the switch (see
1. Place the antistatic bag or the antistatic mat on a flat, stable surface.
2. Attach the electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to
the ESD point on the chassis.
3. Make sure that the voltage across the DC power source cables leads is 0 V and that there is no chance
that the cables might become active during the removal process.
4. Remove the plastic cover from the input terminals by sliding the cover either to the left or right.
5. Unscrew the locking screws counterclockwise using the screwdriver.
6. Remove the cable lugs from the input DC terminals.
7. Push the ejector lever until the power supply is unseated.
8. Grasp the power supply handle and pull firmly to slide the power supply halfway out of the chassis.
9. Taking care not to touch power supply pins, leads, or solder connections, place one hand under the
power supply to support it. Grasp the power supply handle with your other hand and pull the power
supply completely out of the chassis.
10. Place the power supply in the antistatic bag or on the antistatic mat placed on a flat, stable surface.
11. If you are not replacing the power supply, install the cover panel over the slot.
Do not leave the power supply slot empty for a long time while the switch
Figure 59 on page 204):
203