Replacing An M320 Fuse - Juniper M320 Hardware Manual

Replacing an M320 Fuse

Copyright © 2015, Juniper Networks, Inc.
WARNING: You must power off the router before removing or installing a
fuse.
To replace a fuse, you remove the power supply in slot
on—to determine which fuse has blown. Before you remove the fuse, you must power
off the router, then remove the power supply in slot
To replace a fuse (see Figure 74 on page
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.
Power off and remove the power supply in slot
2.
"Replacing an M320 AC Power Supply" on page 247
Supply" on page 250.
CAUTION: Consider the following before you remove a power supply:
An AC-powered router can continue to provide power for all router
hardware configurations with three operating power supplies. If removing
the power supply from slot
router, you must first ensure that the router does not consume more
than 2500 W. If the router does not consume more than 2500 W, you
can safely operate the router with a total of two AC power supplies. To
calculate the power consumption for various hardware configurations,
see "M320 Power Requirements" on page
If you remove a DC power supply from slot
an operating DC power supply in order to keep the router operating.
For more information about power supply redundancy, see
Power Supplies Description" on page 73
Description" on page
Determine which fuse has blown. The yellow LED under the fuse lights and the indicator
3.
bulb becomes visible through the clear cover on the fuse.
Power off the router as described in
4.
Remove the power supply in slot
5.
M320 AC Power Supply" on page 247
page 250.
Grasp the blown fuse by the edges and rock it up and down in its slot until it
6.
disconnects. If the cover slips off the fuse, snap the cover back into place and begin
again.
Chapter 24: Replacing Chassis Components
—while the router is powered
PEM0
to access the fuse.
PEM1
201):
PEM0 . For complete instructions, see
or "Replacing an M320 DC Power
leaves only two power supplies in the
PEM0
96.
PEM0
and "M320 DC Power Supplies
74.
"Powering Off the M320 Router" on page
PEM1 . For complete instructions, see
or "Replacing an M320 DC Power Supply" on
, slot PEM2 must contain
"M320 AC
178.
"Replacing an
199