•
Ensure that you understand how to prevent electrostatic discharge (ESD) damage.
See “Prevention of Electrostatic Discharge Damage” on page 351.
Ensure that you have the following parts and tools available to remove a DC power supply
from an EX9208 switch chassis:
•
ESD grounding strap
•
Phillips (+) screwdriver, number 1 and 2
•
3/8 in. (9.5 mm) nut driver or socket wrench
•
Replacement power supply or cover panel for the power supply slot
CAUTION: Do not leave the power supply slot empty for a long time while
the switch is operational. Either replace the power supply unit promptly or
install a cover panel over the empty slot.
WARNING: Before performing DC power procedures, ensure that power is
removed from the DC circuit. To ensure that all power is off, locate the circuit
breaker on the panel board that services the DC circuit, switch the circuit
breaker to the off position, and tape the switch handle of the circuit breaker
in the off position.
NOTE: After poweringoff a power supply, wait for at least 60 seconds before
turning it back on.
To remove a DC power supply from an EX9208 switch (see Figure 68 on page 222):
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.
3. Attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD
point on the chassis.
4. Move the DC circuit breaker on the DC power supply faceplate to the off (O) position
5. Remove the clear plastic cover protecting the terminal studs on the faceplate.
6. Remove the nut and washer from each of the terminal studs. (Use a 7/16-in. [11-mm]
nut driver or socket wrench.)
7. Remove the cable lugs from the terminal studs.
8. Loosen the captive screws on the bottom edge of the power supply faceplate using
a screwdriver.
221Copyright © 2017, Juniper Networks, Inc.
Chapter 17: Replacing Power Supply
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