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Fanuc PLC CPU repair and troubleshooting

ISO 9001:2015 Certified Quality

Our certified process ensures consistent quality and reliable repairs every time.

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2-Year Repair Warranty

We stand behind our repairs with an extensive 2-year warranty on parts and labor for your peace of mind.

Fast Turnaround Time

Our efficient process and large parts inventory help minimize your operational downtime.

Expert Component-Level Repair

We find and replace individual failed components, offering a more affordable and effective repair than full replacement.

Free, No-Obligation Quote

Send us your item for a free evaluation and receive a detailed repair quote with no commitment required.

Fanuc PLC CPU Repair Services by Roc Industrial LLC

Is your Fanuc PLC CPU malfunctioning and causing downtime? Roc Industrial LLC specializes in providing fast, reliable, and expert Fanuc PLC CPU repair services. Programmable Logic Controllers (PLCs) are the brains of modern automation systems, and the CPU is the critical component that executes the control logic. When your Fanuc PLC CPU fails, it can bring your entire operation to a standstill. We understand the urgency and offer rapid turnaround times, comprehensive diagnostics, and warranty-backed repairs to get your systems back online quickly. Trust Roc Industrial LLC as your trusted partner for all your Fanuc PLC CPU repair needs.



About Fanuc PLCs

Fanuc is a global leader in automation, renowned for its high-performance and reliable PLCs (Programmable Logic Controllers). Fanuc PLCs are widely used in various industries, including manufacturing, robotics, and CNC machining. These PLCs are designed to control complex processes, automate machinery, and improve overall efficiency. Fanuc PLCs are known for their robust construction, advanced features, and seamless integration with other Fanuc products, such as servo drives and robots. Their reputation for quality and durability makes them a preferred choice for demanding industrial applications.


Fanuc PLCs are integral to numerous applications, from controlling robotic arms in automotive assembly lines to managing complex processes in food and beverage production. Their versatility and scalability allow them to be adapted to a wide range of automation needs. The CPUs within these PLCs are responsible for executing the programmed logic, managing input/output signals, and communicating with other devices on the network. A malfunctioning CPU can lead to unpredictable behavior, system failures, and significant downtime, highlighting the importance of reliable repair services.



Supported Models & Series

We repair a wide range of Fanuc PLC CPU models and series, including but not limited to:

  • Fanuc Series 90-30 PLC CPUs (e.g., IC693CPU364, IC693CPU363)

  • Fanuc Series 90-70 PLC CPUs (e.g., IC697CPU731, IC697CPU732)

  • Fanuc Series RX3i PLC CPUs (e.g., IC694CPU331, IC694CPU364)

  • Fanuc Series RX7i PLC CPUs (e.g., IC698CPU531, IC698CPU577)

  • Fanuc PowerMate CNC CPUs

  • Fanuc 0i-MF CPU

  • Fanuc 30i/31i/32i Series CPUs

  • Fanuc R-30iA/R-30iB Controller CPUs

  • Fanuc Focas CNC CPUs

  • Fanuc Series 0-D PLC CPUs

  • Fanuc Series 16/18 PLC CPUs

This is not an exhaustive list. If you have a Fanuc PLC CPU model not listed, please contact us. We have the expertise and resources to repair a wide variety of Fanuc PLC CPUs.



Common Fanuc PLC CPU Problems We Repair

Fanuc PLC CPUs can experience a variety of issues that can disrupt your automation processes. We specialize in diagnosing and repairing these common failures, ensuring minimal downtime and optimal performance.

  • CPU Failure to Start: The CPU does not power on or initialize properly.

  • Communication Errors: Inability to communicate with other devices on the network (e.g., HMI, I/O modules).

  • Memory Errors: Faulty memory modules causing data corruption or program crashes.

  • Program Corruption: Loss or corruption of the PLC program, leading to erratic behavior.

  • Overheating: Excessive heat buildup causing performance degradation or component failure.

  • Power Supply Issues: Problems with the CPU's internal power supply, resulting in unstable operation.

  • I/O Module Failures: Issues with the CPU's ability to interface with input/output modules.

  • Backplane Issues: Problems with the backplane connectors or circuitry, leading to intermittent failures.

  • Real-Time Clock Errors: Inaccurate or non-functional real-time clock.

  • Firmware Corruption: Corrupted or outdated firmware causing operational issues.

  • Blown Fuses: Internal fuses blowing repeatedly, indicating a short circuit or overload.

  • Encoder Faults: Errors related to encoder feedback signals, affecting positioning accuracy.


Our Fanuc PLC CPU Repair Process

Roc Industrial LLC follows a rigorous and comprehensive repair process to ensure the highest quality repairs for your Fanuc PLC CPUs. Our process is designed to identify the root cause of the problem, implement effective solutions, and thoroughly test the repaired unit to guarantee reliable performance.

  1. Free Evaluation and Quote: We offer a free evaluation of your faulty Fanuc PLC CPU. Simply contact us to arrange for shipping or drop-off. Our experienced technicians will assess the unit and provide you with a detailed quote for the repair.

  2. Shipping Instructions: Once you approve the quote, we will provide you with detailed shipping instructions to ensure your Fanuc PLC CPU arrives safely at our repair facility. We recommend using a reputable carrier and properly packaging the unit to prevent damage during transit.

  3. Diagnosis Using Specialized Test Equipment: Our technicians use state-of-the-art diagnostic equipment to pinpoint the exact cause of the failure. We perform thorough testing of all critical components, including the CPU, memory, power supply, and I/O interfaces.

  4. Component-Level Repair and Replacement: We perform component-level repairs, replacing faulty components with high-quality replacements. Our extensive inventory of parts allows us to quickly address a wide range of issues. We use only industry-standard components and follow best practices for soldering and assembly.

  5. Load Testing and Quality Checks: After the repair is complete, we subject the Fanuc PLC CPU to rigorous load testing to ensure it performs reliably under real-world conditions. We simulate various operating scenarios and monitor the unit's performance to verify its stability and accuracy.

  6. Warranty-Backed Return and Support: All our Fanuc PLC CPU repairs are backed by a comprehensive warranty. If you experience any issues after the repair, simply contact us, and we will provide prompt and effective support. We are committed to ensuring your complete satisfaction with our services.


Nationwide Repair Services

Roc Industrial LLC provides Fanuc PLC CPU repair services to customers nationwide. We understand that downtime can be costly, so we offer fast turnaround times and efficient shipping options to minimize disruption to your operations. Whether you are located in New York, Los Angeles, Chicago, Houston, or Dallas, we can quickly and reliably repair your Fanuc PLC CPU.


We offer expedited shipping options to ensure your Fanuc PLC CPU arrives at our facility quickly. Our streamlined repair process and extensive inventory of parts allow us to complete most repairs within a few business days. We also provide regular updates on the status of your repair, so you can stay informed throughout the process. Roc Industrial LLC is committed to providing exceptional service to customers across the country.



Why Choose Roc Industrial LLC?

When it comes to Fanuc PLC CPU repair, Roc Industrial LLC offers a unique combination of expertise, experience, and customer service. We are committed to providing the highest quality repairs and ensuring your complete satisfaction.

  • 30+ Years of Experience: Our technicians have decades of experience repairing Fanuc PLCs and other industrial automation equipment.

  • Warranty-Backed Repairs: All our repairs are backed by a comprehensive warranty, giving you peace of mind.

  • Thousands of Parts in Stock: Our extensive inventory of parts allows us to quickly address a wide range of issues.

  • Fast Turnaround, Often Same-Day: We understand the urgency of downtime and offer fast turnaround times, often completing repairs the same day.

  • ISO-Certified Repair Processes: Our repair processes are ISO-certified, ensuring the highest standards of quality and consistency.

  • Exceptional Customer Support: Our dedicated customer support team is available to answer your questions and provide assistance throughout the repair process.

Don’t let a faulty Fanuc PLC CPU slow down your operations. Contact Roc Industrial LLC today for a free evaluation and fast, reliable repair. We are your trusted partner for all your Fanuc PLC CPU repair and troubleshooting needs.

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