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    Troubleshooting the M40e Power System When All LEDs on Both Supplies Are Off

    Problem

    The following LED states indicate that a power supply is functioning correctly:

    • On an AC power supply, the green LED labeled OUTPUT OK is lit steadily.
    • On a DC power supply, both the green LED labeled CB ON and blue LED labeled OUTPUT OK are lit steadily and the yellow LED labeled CB OFF is not lit.

    Solution

    If all LEDs are off on both power supply faceplates, either someone has switched off power to the router or the system temperature has exceeded the acceptable maximum. In the latter case, the host module shuts down both power supplies. There is no power to the router, so the alarm LEDs on the craft interface are not lit and the LCD also goes blank.

    Excessive system temperature is almost always caused by excessive environmental temperature. Correct the environmental temperature before powering on the router.


    Published: 2010-10-28