Another indication that a fuse has blown is when the colored indicator bulb inside it
becomes visible through the clear cover on the fuse. For information about the indicator
bulb color for each fuse type, see the appropriate router hardware guide.
A blown fuse can cause a component to fail even though it is correctly installed and the
power supplies are functioning. Check for a blown fuse in the following circumstances:
• The LED that indicates normal operation for the component fails to light.
• The appropriate show chassis environment command indicates that the component
is installed but is not receiving power.
Figure 88 on page 226 shows the location of the M320 fuses in the rear of the midplane
for the FPC. (The labels shown in the figure do not appear on the actual fuses—the clear
cover on every fuse reads BUSS GMT-X—and might not match the labels on the midplane.
Ignore the labels on the midplane.)
Figure 88: Component Fuses in the M320 Router Midplane
Copyright © 2012, Juniper Networks, Inc.226
M Series and T Series Routers Monitoring and Troubleshooting Guide
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