NMI Alarm in BOC (Base Board Controller)

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This alarm indicates a Non-Maskable Interrupt (NMI) originating from the Base Board Controller (BOC) within the Fanuc Series 20 CNC. An NMI is a critical, high-priority interrupt that usually signals a serious hardware malfunction that the CPU cannot ignore, often leading to a system halt.

• Faulty BOC hardware or associated circuitry on the CNC main board.
• Memory error on the BOC or related components.
• Power supply irregularities affecting the BOC.
• Overheating of the BOC or surrounding components.
• ESD damage to the BOC.

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1. 1

   Power cycle the CNC system to attempt a reset of the BOC and clear the NMI.

2. 2

   Verify stable and clean power supply to the CNC main board, checking for voltage drops or spikes.

3. 3

   Inspect the CNC main board for any visible damage, such as burn marks or damaged components in the BOC area.

4. 4

   Ensure adequate cooling inside the CNC cabinet and check for proper fan operation and clear airflow.

5. 5

   If the alarm persists, it indicates a hardware fault on the CNC main board related to the BOC, requiring replacement of the main board.