JUNOS Internet Software Network Operations Guide: Hardware
174 ! Verifying FPC Failure
Step 3: Check the FPC Fuses
The M40e and M160 router fuses are located in a fuse box at the rear of the
midplane, behind the lower rear impeller assembly. You must remove the lower
impeller assembly to access the fuses, as described in the appropriate hardware
guide.
The M320 router requires fuses for the FPCs. The fuses for the and FPCs are located
in the rear of the midplane behind the power supply in slot
PEM0.
When the fuse for an FPC blows, the FPC stops functioning even though it is
installed correctly and the power supplies are providing power to the router.
For the M40e and M160 routers, when a fuse has blown but the power supplies are
still delivering power to router, the amber LED adjacent to the fuse lights. For
vertically oriented fuses (in the groups labeled
J241 through J244.
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 CLI show chassis environment command indicates that the
component is installed but is not receiving power.
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