Juniper EX4300 Series - Page 310

• Ensure you understand how to prevent electrostac discharge (ESD) damage. See Prevenon of
Electrostac Discharge Damage .
Ensure that you have the following parts and tools available to remove the power supply from the
switch chassis:
• ESD grounding strap
• Phillips (+) screwdriver, number 2
• An anstac bag or an anstac mat
• Replacement power supply or a cover panel for the power supply slot
The power supply in EX4300 switches is a hot-removable and hot-insertable eld-replaceable unit (FRU)
installed in the rear panel of the switch: You can remove and replace it without powering o the switch
or disrupng switch funcons.
CAUTION: We recommend that you install either a replacement power supply or a
cover panel in the empty power supply slot to prevent chassis overheang and dust
accumulaon.
NOTE: The power supply slots are at the right end of the rear panel on 24-port and 48-port
switches, and at the le end on 32-port switches. Figure 90 on page 301 shows how to remove a
DC power supply from 24-port or 48-port switches. The procedure is the same for 32-port
switches.
1. Place the anstac bag or the anstac mat on a at, stable surface.
2. Aach the 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 acve during the removal process.
4. Remove the plasc cover from the input terminals by sliding the cover either to the le or right.
5. Unscrew the locking screws counterclockwise by using the screwdriver.
6. Remove the cable lugs from the input DC terminals.
7. Slide the ejector lever toward the le unl the power supply is unseated.
8. Grasp the power supply handle and pull rmly to slide the power supply halfway out of the chassis.
9. Taking care not to touch power supply pins, leads, or solder connecons, 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 anstac bag or on the anstac mat placed on a at, stable surface.
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