Troubleshoot MUX CPU Fail

• 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