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    How to Trouble-shoot MUX CPU Fail

    Issue

    The panel is displaying a MUX CPU FAIL. Is the panel or MUX Driver Card bad?

    Solution

    If the panel is wired Class A on the Multiplex Buss Check the Buss for a short - A short, ground or noise on the Class A loop will cause a CPU FAIL to be displayed on the Panel.

    If there is not a short, ground or noise on the mux loop or the panel is wired Class B then do the following:

    Power down the panel completely

    Remove all MUX field wiring from the card

    Remove the MUX Driver Card

    Inspect the Pins and Socket for damage

    Reseat the card Repower the panel - if the MUX CPU FAIL is still present, Try defaulting the panel -If the CPU fail is still present replace the panel and MUX Driver Card.

    Part numbers FPD-7024, D7024, DS9400, DS9400I, DS9400M, DS9431, D7039, FPE-7039

     

    Version history
    Revision #:
    2 of 2
    Last update:
    ‎05-21-2018 07:31 PM
    Updated by:
     
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