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    Verify SFM Failure

    To verify SFM failure:

    1. Check the SFM Connection
    2. Check the SFM Fuses
    3. Perform an SFM Swap Test

    Check the SFM Connection

    Purpose

    To verify SFM failure by checking the SFM connection.

    Action

    To check the SFM connection, make sure that it is properly seated in the midplane. Check the thumbscrews on the ejector locking tabs.

    Check the SFM Fuses

    Purpose

    To check for blown SFM fuses.

    Action

    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 M40e Router Hardware Guide.

    When the fuse for an SFM blows, the SFM 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 1.

    Figure 1: M40e M160 Router Fuses

    M40e 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.

    Perform an SFM Swap Test

    Purpose

    To verify SFM failure by performing an SFM swap test.

    Caution: Before performing a swap test, always check for bent pins in the midplane and check the SFM for stuck pins in the connector. Pins stuck in the component connector can damage other good slots during a swap test.

    Action

    To perform a swap test on an SFM:

    1. Remove the chassis rear component cover by loosening the screws on the corners of the cover and pulling it straight out from the chassis.
    2. Take the SFM offline by doing one of the following:
      • Use the following command:
        user@host> request chassis sfm slot slot-number offline
      • Press and hold the offline button on the SFM faceplate at the rear of the router until the SFM OK LED turns off (about 5 seconds).
    3. Remove the SFM, as described in the M40e and M160 router hardware guides.
    4. Replace the SFM with one that you know works.
    5. Bring the SFM online by doing one of the following:
      • Use the following command:
        user@host> request chassis sfm slot slot-number online
      • Press and hold the offline button on the SFM faceplate until the green OK LED lights (about 5 seconds).
    6. Reinstall the rear component cover and tighten the screws to secure it to the chassis.
    7. Check the SFM status.

    Published: 2012-08-20