•
Ensure you understand how to prevent electrostatic discharge (ESD) damage. See
“Prevention of Electrostatic Discharge Damage” on page 351.
•
Ensure that the voltage across the DC power source cable leads is 0 V and that there
is no chance that the cable leads might become active during installation.
Ensure that you have the following parts and tools available to install a DC power supply
in an EX9208 switch chassis:
•
ESD grounding strap
•
Phillips (+) screwdriver, number 1 and 2
To install a DC power supply in an EX9208 switch (see Figure 67 on page 220):
1. Attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD
point on the chassis.
2. If the power supply slot has a cover panel on it, unscrew the screw on the side of the
cover panel in the counterclockwise direction using the screwdriver, and remove the
cover panel. Save the cover panel for later use.
3. Taking care not to touch power supply components, pins, leads, or solder connections,
remove the power supply from its bag.
4. Move the DC circuit breaker on the power supply faceplate to the off (O) position.
5. Using both hands, place the power supply in the power supply slot on the front of the
switch. Slide the power supply straight into the chassis until the power supply is fully
seated in the slot. Ensure the power supply faceplate is flush with any adjacent power
supply faceplates or power supply cover panels.
6. Push the handle toward the faceplate of the power supply until it is flush against the
faceplate.
7. Push the captive screw into the power supply faceplate. Ensure that the screw is
seated inside the corresponding hole on the faceplate.
8. Tighten the captive screw by turning it clockwise using the screwdriver. When the
screw is completely tight, the latch locks into the switch chassis.
219Copyright © 2017, Juniper Networks, Inc.
Chapter 17: Replacing Power Supply
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