Step 2: Check the PCG Fuses

Action

Check the PCG fuses to check for failure.

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 router hardware guide.

When the fuse for an PCG blows, the PCG 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. See Figure 155.

Figure 155: M40e and M160 Router Fuses

Another indication that a fuse has blown is that 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.