FANUC A20B-2900-0350-03A Circuit Board A20B-2900-0350/03A A350-2900-T358/03

( Brand: Fanuc ), ( Manufacturer Part Number: A20B-2900-0350/03A ), ( Model: A20B-2900-0350 ), ( Part Type: Circuit Board ), ( Country Of Origin: Japan )

Review FANUC A20b-2900-0350/03a Circuit Board A350-2900-t358/03

The **FANUC A20B-2900-0350/03A** and **A350-2900-T358/03** circuit boards are critical components of FANUC s advanced CNC (Computer Numerical Control) systems, specifically designed for high-performance industrial automation applications. These boards are integral to the **Series 21i-TB/21i-TE** and **Series 0i-FE/0i-FE2** CNC controllers, which are widely deployed in machining centers, lathes, and multi-axis systems across manufacturing, aerospace, automotive, and precision engineering sectors. The **A20B-2900-0350/03A** serves as the **main servo control board**, responsible for managing the precise motion control of servo motors, spindle drives, and linear axes with exceptional accuracy and responsiveness. Engineered with FANUC s proprietary **iTNC** (Intelligent Tooling Numerical Control) technology, this board interfaces directly with the CNC s central processing unit (CPU) to execute real-time trajectory calculations, ensuring smooth, high-speed interpolation, and adaptive feed control. Its robust design incorporates high-speed digital signal processing (DSP) and analog-to-digital conversion (ADC) capabilities, allowing it to handle complex motion profiles, including circular, helical, and linear interpolations, with minimal overshoot and vibration. The board s **03A variant** often includes enhanced features such as improved noise filtering, expanded communication ports, and compatibility with newer servo amplifiers, making it suitable for modernizing legacy systems or integrating with advanced FANUC i-series controllers.

Complementing the servo control is the **A350-2900-T358/03**, a **high-performance communication and I/O expansion board** that extends the CNC s connectivity and peripheral control capabilities. This board acts as a critical bridge between the main controller and external devices, facilitating seamless data exchange via **FANUC s proprietary communication protocols**, including **FOCAS (FANUC Open Communication Architecture for Servo)**, **Ethernet/IP**, and **DeviceNet**, depending on the system configuration. The **T358** designation indicates its role in handling **high-speed, time-synchronized I/O signals**, such as encoder feedback, limit switches, and analog inputs/outputs, with sub-microsecond latency essential for applications requiring tight synchronization with PLCs, vision systems, or robotics. Additionally, this board supports **multi-axis expansion**, allowing the CNC to manage up to **32 axes** (depending on the system architecture), which is vital for complex machining operations like 5-axis simultaneous control or multi-spindle setups. The **03** suffix often denotes a specific revision or firmware compatibility, ensuring backward and forward compatibility with other FANUC components while incorporating optimizations for reduced power consumption and increased reliability. Together, these boards exemplify FANUC s commitment to **precision engineering and industrial-grade durability**, making them indispensable for manufacturers demanding uncompromising performance, repeatability, and integration flexibility in their automated production lines.

### **Pros and Cons of Buying Used Fanuc A20B-2900-0350/03A Circuit Board and A350-2900-T358/03**

#### **Fanuc A20B-2900-0350/03A Circuit Board**

1. **Cost Savings** Used boards are significantly cheaper than new OEM parts, making them attractive for budget-conscious buyers.

2. **Functionality** If tested and verified, these boards can perform identically to new ones, providing the same control capabilities for Fanuc CNC machines.

3. **Availability** Newer models may have long lead times, while used boards can be sourced quickly from refurbishers or liquidators.

4. **Compatibility** This specific board is designed for Fanuc Series 21/24/28/30/32/35/36i controls, ensuring it fits standard CNC setups.

5. **Refurbished Quality** Some sellers offer professionally cleaned, tested, and calibrated boards, reducing the risk of immediate failure.

1. **Age and Wear** Older boards may have degraded capacitors, worn-out solder joints, or general wear that could lead to premature failure.

2. **No Warranty** Used parts typically come without warranty coverage, meaning repair or replacement costs fall on the buyer if issues arise.

3. **Testing Uncertainty** Without independent verification, there s a risk of hidden defects (e.g., faulty memory chips, damaged connectors).

4. **Limited Support** Fanuc s official support may not cover used parts, complicating troubleshooting or replacements.

5. **Compatibility Risks** If the board was previously used in a different machine or environment, it may not function optimally in your setup.

---

#### **Fanuc A350-2900-T358/03 (Touchscreen/Operator Panel)**

1. **Cost-Effective Alternative** Like the circuit board, used touchscreens are far cheaper than new units, reducing operational costs.

2. **Functionality Retention** If the panel is in working condition, it provides the same user interface for programming, monitoring, and diagnostics.

3. **Quick Replacement** Avoids the delay of waiting for a new OEM panel, minimizing downtime.

4. **Compatibility** This model is designed for Fanuc Series 21/24/28/30/32/35/36i controls, ensuring it integrates with your existing system.

5. **Visual and Operational Consistency** Used panels can maintain the same display quality and responsiveness as new ones if well-maintained.

1. **Physical Damage Risk** Screens may have scratches, dead pixels, or backlight issues that affect usability.

2. **Software Glitches** Older firmware versions may lack updates, leading to compatibility issues with newer CNC software or security vulnerabilities.

3. **No Guarantee of Functionality** Touch sensitivity, buttons, or internal connections might degrade over time.

4. **Limited Lifespan** LCD/LED screens degrade with age, and replacement parts (e.g., backlights) may not be available long-term.

5. **No Support or Warranty** Like the circuit board, used panels lack manufacturer-backed support, increasing maintenance risks.

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### **Ending Conclusion**

Buying used Fanuc circuit boards and touchscreen panels can be a **cost-effective solution** for maintaining or upgrading older CNC machines, especially when new parts are prohibitively expensive or unavailable. However, the **risks of unreliability, lack of warranty, and potential compatibility issues** make it essential to approach these purchases with caution. **Thorough testing, sourcing from reputable refurbishers, and considering the long-term costs of maintenance** are critical factors in determining whether the savings justify the risks.

For **mission-critical or high-value machines**, the **reliability of new or certified refurbished parts** may outweigh the cost savings of used components. If proceeding with used parts, **insist on pre-testing, documentation of functionality, and a clear return or replacement policy** to mitigate risks.

---

### **Recommendation**

- **Avoid used parts** unless you have **full confidence in the seller s testing process** (e.g., professional refurbishment with a warranty).

- **Prioritize new or certified refurbished parts** from authorized Fanuc distributors to ensure reliability and support.

- **Purchase from trusted refurbishers** who offer **detailed testing reports, limited warranties, or money-back guarantees**.

- **Test the parts thoroughly** before installation, including **power-on diagnostics, connectivity checks, and functionality tests**.

- **Budget for potential replacements** in case of early failure, as used parts may not last as long as new ones.

- **Consider remanufactured or remapped parts** from companies specializing in CNC component refurbishment. These may offer a middle ground between used and new parts with improved reliability.

- **Explore rental or lease options** for critical components if long-term use is uncertain.

Ultimately, the decision depends on **your risk tolerance, machine criticality, and budget constraints**. If cost is the primary driver, proceed with **extreme due diligence**; if reliability is non-negotiable, invest in **new or certified refurbished parts**.

Details:

With its advanced technology and durable construction, this circuit board is a key component in ensuring smooth efficient operations for wide range of industrial applications. The Fanuc A20B-2900-0350/03A Circuit Board is a high-quality industrial automation component manufactured by FANUC in Japan.

part #: a20b2900035003a prices

• $24.94-$323.99

specifications automationjack:

• brand: Fanuc
• mpn: A20b-2900-0350/03a
• model: A20b-2900-0350
• part type: Circuit Board
• country of origin: Japan

seller automationjack:

• # reviews: 1660
• city: Champaign, Illinois
• rating: 98.9%

general automationjack:

• Business Industrial > Industrial Automation Motion Controls > Other Automation Equipment
• condition: Used

shipping automationjack:

• carrier: USPS
• class: Standard
• service: USPS Ground Advantage
• transit: 5-11 Days
• cost: $0.00
• type: Fixed

payments automationjack:

• credit card: Mastercard
• wallet: Apple-pay
• other

returns automationjack:

• policy: Returns Accepted
• paid by: Buyer
• time: 60 Days
• method: Money back

offer automationjack:

• options: Ship-to-home
• availability: In Stock
• best offers: True
• sold: 0
• quantity: 1
• started: May 21, 2026

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