PW0008

CPU SELF TEST ERROR(DCS PMC)

Fanuc · Alpha i Series Servo Amplifier

What does PW0008 mean?

The DCS PMC detected an error in its CPU self-test function and RAM check function. This indicates a critical hardware fault within the DCS PMC unit, necessitating a power cycle to attempt to clear the alarm.

Common Causes

  • DCS PMC CPU internal memory (RAM) corruption.
  • DCS PMC CPU hardware component failure.
  • Power surge or brownout during DCS PMC operation.
  • Firmware corruption in the DCS PMC.
  • Overheating of the DCS PMC unit.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Perform a DCS PMC power cycle (turn off and on).

  2. 2

    Check for visual signs of damage or overheating on the DCS PMC.

  3. 3

    Reload the DCS PMC firmware from a verified source.

  4. 4

    Measure supply voltage (e.g., 24VDC) to the DCS PMC.

  5. 5

    If the fault persists, consider replacing the DCS PMC unit.

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Verified technical data. Last updated: March 2026

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Source: Fanuc Alpha i Series Servo Amplifier