Bosch Building Technologies

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    • Cause

     

    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
    • Reset 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
    Last update:
    ‎06-02-2022 10:58 AM
    Updated by:
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