Juniper EX Series User manual

Removing a Power Supply from an EX-series Switch
The power supply in EX 3200 and EX 4200 switches is a hot-removable and
hot-insertable field-replaceable unit (FRU): you can remove and replace it without
powering off the switch or disrupting switch functions.
Before you begin removing a power supply from an EX 3200 or EX 4200 switch,
ensure that you have taken the necessary precautions to prevent ESD damage (see
Preventing Electrostatic Discharge Damage).
Ensure you have the following parts and tools available to remove a power supply
from an EX 3200 or EX 4200 switch chassis:
■Electrostatic discharge (ESD) grounding strap
■Phillips (+) screwdriver, number 2
■An antistatic bag or an antistatic mat
CAUTION: Do not leave the power supply slot empty for a long time while the switch
is on. The power supply must remain in the chassis for proper airflow.
To remove a power supply from an EX 3200 or EX 4200 switch (see
Figure 1 on page 2):
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. Disconnect power to the switch by performing one of the following:
■AC power supply—If the AC power source outlet has a power switch, set it
to the OFF (0) position. If the AC power source outlet does not have a power
switch, gently pull out the male end of the power cord connected to the
power source outlet.
■DC power supply—Switch the circuit breaker on the panel board that services
the DC circuit to the OFF position.
4. Remove the power source cable from the power supply faceplate:
■AC power supply—Gently pull out the female end of the power cord
connected to the power supply faceplate.
■DC power supply—Remove the screws securing the ring lugs attached to
the power source cables to the power supply using the
Phillips (+) screwdriver, number 2, and remove the power source cables
from the power supply. Replace the screws on the terminals and tighten
them.
5. Loosen the locking lever screw on the left front of the power supply by using the
Phillips (+) screwdriver, number 2.
6. Push down on the locking lever until it is in its lowest position.
Removing a Power Supply from an EX-series Switch ■1

7. Grasp the power supply handle and pull firmly to slide it halfway out of the
chassis.
8. Place one hand under the power supply to support it and slide it completely out
of the chassis. Take care not to touch power supply components, pins, leads, or
solder connections.
9. Place the power supply in the antistatic bag or on the antistatic mat placed on
a flat, stable surface.
Figure 1: Removing a Power Supply from an EX 3200 or EX 4200 Switch
Locking lever
g020090
Loosen captive screw.
Related Topics ■Installing a Power Supply in an EX-series Switch
■Installing and Removing EX-series Switch Hardware Components
■Power Supply in EX-series Switches
■Field-Replaceable Units in EX-series Switches
■AC Power, Connection, and Power Cord Specifications
■EX 3200 Switch—Rear-Panel Description
■EX 4200 Switch—Rear-Panel Description
2■Removing a Power Supply from an EX-series Switch