Juniper EX9253 Hardware Manual page 139

WARNING: Before you perform DC power procedures, ensure there is no power to 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.
To install a DC power supply in an EX9253 switch (see
1. Wrap and fasten one end of the ESD wrist strap around your bare wrist, and connect the other end
of the strap to the ESD point on the switch.
2. If the power supply slot has a cover panel on it, remove the cover panel, and 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 position.
5. Using both hands, hold and slide the DC power supply straight into the chassis until the power
supply is fully seated in the power supply slot. The power supply faceplate must align with the power
supply faceplate or the cover panel installed in the adjacent power supply slot.
Figure 50: Installing a DC Power Supply
NOTE: If you have a Juniper J-Care service contract, register any addition, change, or upgrade of
hardware components at
Failure to do so can result in significant delays if you need replacement parts. This note does not
apply if you replace existing components with the same type of component.
https:/ /www.juniper.net/customers/support/tools/updateinstallbase/
Figure 50 on page 130):
130
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