Replacing An M10I Dc Power Supply; Removing An M10I Dc Power Supply - Juniper M10i Hardware Manual

Replacing an M10i DC Power Supply

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Maintaining the M10i Power Supplies on page 82
Troubleshooting the M10i Power System on page 95
A DC-powered router has up to four load-sharing DC power supplies. The router must
have at least two DC power supplies, and any two DC power supplies can provide full
power to the router. Each redundant power supply is hot-removable and hot-insertable,
as described in "M10i Field-Replaceable Units (FRUs)" on page 99. For M10i routers with
only two DC power supplies, you must power off the router before replacing a DC power
supply.
Removing an M10i DC Power Supply on page 125
1.
Installing an M10i DC Power Supply on page 126
2.

Removing an M10i DC Power Supply

The DC power supplies are located at the bottom rear of the chassis, as shown in "M10i
Chassis Description" on page 5. For information about power supply redundancy and
replaceability, see "M10i Power System Description" on page 24.
CAUTION: Do not leave a power supply slot empty for more than a short time
while the router is operational. The power supply must remain in the chassis
for proper airflow.
To remove a DC power supply (see Figure 49 on page 126):
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
1.
the strap to one of the ESD points on the chassis.
Press the power switch for the power supply (located on the power supply faceplate)
2.
to the ( ) position.
OFF O
NOTE: If you are power cycling the power supply rather than shutting it
off for a time, wait at least 60 seconds after turning it off before turning
it back on. If you need to power it off again, wait for at least 60 seconds
after powering it on.
Shut off the power flowing to the power supply from the external power source, so
3.
that the voltage across the leads of the DC power cables is 0 V. Ensure that there is
no chance that the cable leads might become active during the procedure.
Using a number 1 Phillips screwdriver, turn the screw on each field-wiring terminal
4.
counter-clockwise to loosen the terminal connector from around the cable lug.
Remove the cables from the terminal connectors and from the hook located on the
5.
faceplate to the right of the field-wiring terminals.
Chapter 15: Replacing M10i Hardware Components
125