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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

CPF07

ASIC Internal RAM Fault

Yaskawa · E7 Drive

What does CPF07 mean?

An internal RAM fault was detected within the ASIC (Application-Specific Integrated Circuit) of the drive. This is a critical internal hardware failure, indicating control circuit damage and rendering the drive inoperable.

Common Causes

  • Defective ASIC (Application-Specific Integrated Circuit) chip due to manufacturing defect or degradation.
  • Over-temperature conditions leading to accelerated component failure within the ASIC or its associated circuitry.
  • Internal power supply instability (e.g., 3.3V rail) affecting the ASIC's operation.
  • Electrostatic Discharge (ESD) damage during handling or prior servicing, affecting the control board.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    1. Cycle power to the drive completely, ensuring a full discharge, then reapply power.

  2. 2

    2. Monitor the ambient operating temperature to ensure it remains within the drive's specified limits (e.g., below 50°C).

  3. 3

    3. Verify the integrity of all internal ribbon cable connections on the control board (if accessible) for secure seating.

  4. 4

    4. Check for visual signs of damage on the control board, such as burnt components or swollen capacitors.

  5. 5

    5. If the fault persists, replacement of the control board is necessary as the ASIC is a core, integrated component.

Browse all codes in this manual (64)
Verified technical data. Last updated: April 2026

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Source: Yaskawa E7 Drive
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