The FANUC A20B‑2003‑0311 is an original spindle MZI sensor feedback PCB unit for FANUC CNC spindle motor systems. This critical signal-feedback component mounts directly on the spindle motor, collecting spindle rotation speed, rotation angle, and one-revolution reference position signals, then transmitting accurate feedback data back to the CNC controller.

This board enables precise spindle orientation, rigid tapping, and automatic tool-change positioning functions for machine-tool spindles. Widely used for faulty sensor-board replacement, spindle-system maintenance, and retrofitting on CNC lathes, machining centers, and milling machines. It resolves common failures including spindle orientation errors, spindle alarm SP9073, tool-change failures, and abnormal spindle speed feedback.

• High-precision Spindle Position & Speed Feedback: High-sensitivity non-contact sensing design delivers stable rotation-speed and one-turn reference signals, ensuring accurate spindle orientation for automatic tool changes and precision cutting processes.
• Stable Signal Output Performance: Optimized PCB circuit layout and signal-filtering circuits effectively suppress signal distortion during high-speed spindle rotation, maintaining reliable feedback even under heavy-cutting vibration conditions.
• Qualified ECE R10 EMC Anti-interference Performance: Built-in signal shielding circuitry resists electromagnetic interference within CNC electrical cabinets, fully complying with ECE R10 electromagnetic-compatibility regulations and EU CE export standards.
• Industrial-grade Compact & Durable Structure: Original high-temperature resistant substrate and industrial electronic components in a compact integrated mechanical-PCB assembly adapt to high-temperature and vibration environments within spindle motor cavities.
• Perfect System Matching & Easy Replacement: Standard mounting hole positions and original pin definitions enable direct replacement of damaged original units without requiring extra program modifications, reducing on-site maintenance time.
• Quick Fault Location Support: Accurate signal feedback helps CNC systems output corresponding alarm codes, allowing maintenance technicians to rapidly identify spindle sensor-related faults.

• Precision Mold Manufacturing: Vertical machining centers, high-speed milling machine equipment
• General CNC Machining: CNC lathes, tapping-milling centers, automatic tool-change machine tools
• Automotive Parts Manufacturing: CNC production lines for auto precision component processing
• Aerospace Precision Hardware: Multi-axis high-end CNC processing equipment
• Equipment Maintenance & Retrofit: Replacement of faulty spindle sensor PCB for existing FANUC CNC machine tools

• 1 × FANUC A20B‑2003‑0311 Control PCB Circuit Board
• 1 × Anti-static & Shock-proof Export Packaging
• 1 × Product Technical Specification Manual
• 1 × CE & ECE R10 Compliance Certificate