The FANUC A20B-2101-0891 is commonly identified in the industrial replacement-parts market as a servo amplifier control board, servo control PCB, or servo drive circuit board.

In a compatible FANUC drive assembly, this PCB serves as a control-side electronic board and works with the associated amplifier hardware to support servo-system operation and internal signal processing.

The A20B-2101-0891 may be required when the original board has confirmed component damage, unstable electronic operation, communication faults, or other diagnosed board-level problems within the servo amplifier.

Publicly indexed listings show different PCB revision markings, including examples such as /05B and /08C. The complete part number and revision should therefore be checked before replacement.

• Servo control functions tested before shipment
  
• In stock and available for prompt dispatch
  
• Worldwide DHL, UPS, and FedEx shipping

Product Details

• Brand: FANUC
• Part Number: A20B-2101-0891
• Alternative Format: A20B21010891
• Common Product Name: Servo Amplifier Control Board
• Type: Servo Control PCB / Servo Drive Circuit Board
• Product Series: A20B-2101
• Application: Compatible FANUC Servo Amplifier Systems
• Function: Control-side electronic operation and internal signal processing
• Category: FANUC Servo Amplifier PCB / CNC Drive Board

Compatibility Note

A publicly accessible FANUC document conclusively mapping the A20B-2101-0891 to every compatible complete amplifier model was not located during this search. Compatibility should therefore be confirmed from the original equipment rather than inferred from a seller listing.

Before ordering, please verify:

• Complete PCB number and revision
• Full servo amplifier model number
• Original connector and component layout
• Input-voltage and amplifier configuration
• Number of controlled axes
• Photographs of the original board
• Whether the individual PCB or complete amplifier is required

Boards with similar A20B-2101 numbers may perform different functions and should not be treated as interchangeable without confirmation.

Common Use Cases

• FANUC servo amplifier control-board replacement
• Troubleshooting unstable servo-drive operation
• Repair of damaged electronic components or PCB traces
• Diagnosis of internal control or communication faults
• Restoration of compatible FANUC servo amplifier equipment
• Preparation of a tested spare PCB for CNC maintenance

Sales & Support

Each A20B-2101-0891 control board is inspected and tested under applicable conditions before delivery.

Worldwide shipping is available through DHL, UPS, FedEx, and other express carriers. REACO CNC provides PCB repair service, warranty coverage, testing-video support, and technical assistance for FANUC servo amplifier boards and CNC drive components.