Fanuc

Your Trusted Source for FANUC Parts: CNC Boards, Servo Systems & Robot Components

FANUC Ltd. is the world’s leading manufacturer of CNC controllers, industrial robots, and servo drive systems, with an installed base of over 4 million CNC units and 700,000 robots operating in factories across every continent. Founded in 1956 in Oshino-mura, Japan, FANUC has built a global reputation for engineering precision, extraordinary reliability, and decades-long product longevity — qualities that make genuine replacement parts both critically important and increasingly difficult to source as systems age.

At Atlantech Drives & Controls, we have direct experience supplying FANUC components to maintenance teams and procurement departments worldwide. Whether you are keeping a legacy CNC machining centre running, restoring a high-payload robot cell after an amplifier failure, or sourcing a hard-to-find encoder for a servo axis, Atlantech is your trusted procurement partner.

Comprehensive FANUC Product Portfolio

FANUC’s product range spans the full spectrum of motion control and factory automation. At Atlantech Drives, we supply components across all major product families:

1. CNC Control PCBs and Circuit Boards

FANUC CNC controllers — from the legacy Series 0, Series 15, and Series 16/18/21 to the modern Series 30i/31i/32i — rely on a modular architecture of printed circuit boards for CPU processing, axis control, PMC ladder logic, memory, I/O interfacing, and power supply functions. Board part numbers follow the A20B, A16B, and A17B series naming convention. These boards are the most frequently demanded replacement parts in FANUC CNC maintenance, as they are the first components to fail after years of continuous operation in machine tool environments. Atlantech supplies both individual boards and matched PCB sets for the most common failure scenarios.

2. Servo Amplifiers

FANUC servo amplifiers — including the Alpha series, Alpha i series, and Beta series — convert controller commands into precise motor drive currents for CNC axes and robot joints. The modular architecture of these amplifiers means that individual internal PCBs (power boards and control boards) can often be replaced without sourcing an entire new amplifier unit, significantly reducing repair costs. Atlantech supplies complete amplifier units as well as individual internal boards for the most widely deployed amplifier models.

3. Servo and Spindle Motors

FANUC AC servo motors (Alpha, Alpha i, Beta series) and AC spindle motors are engineered for exceptional torque density, encoder precision, and operational lifespan in demanding CNC and robotic applications. Part numbers follow the A06B series convention. Atlantech sources both current and legacy motor variants, including models that have been discontinued by the manufacturer but remain essential for maintaining existing machine tool installations.

4. Encoders and Pulse Coders

FANUC pulse coders and encoders — part numbers in the A860 series — provide position feedback for servo axes in CNC machines and robots. Encoder failure is one of the most common causes of servo alarms in FANUC systems, and genuine FANUC encoders are essential for maintaining the positioning accuracy that CNC machining operations demand. Atlantech supplies both standard and absolute encoder variants compatible with the full range of FANUC servo motors.

The Challenge of Obsolete FANUC Components

FANUC systems are engineered to last — it is not uncommon to find Series 0 or Series 15 CNC controllers still running production in machine shops 25 to 30 years after installation. However, as FANUC periodically discontinues older product families, sourcing genuine replacement boards, amplifiers, and motors for these legacy systems becomes progressively harder through standard distribution channels.

Atlantech Drives specialises in locating discontinued and hard-to-find FANUC components. Our global procurement network allows us to source genuine New Old Stock (NOS), tested surplus, and professionally refurbished FANUC parts for systems that official channels can no longer support — keeping your machines running without the cost and disruption of a full CNC retrofit.

Troubleshooting FANUC Servo and CNC Faults

Rapid diagnosis saves downtime. When a FANUC CNC displays a servo alarm in the 4xx or 9xx range, the fault is most commonly in the servo amplifier rather than the motor itself — check the amplifier’s 7-segment LED display first for a specific fault code before condemning the motor. For FSSB communication errors (SRVO-062 or SRVO-063 on R-30iA robot controllers), always inspect the optical fibre cables connecting the controller to the amplifier before replacing the control PCB — contaminated or damaged fibre connectors are the most frequent cause of FSSB faults and are far cheaper to resolve than a board replacement.

For CNC systems displaying alarm 401 (servo not ready) after a power cycle, verify that the DC link voltage in the servo amplifier has fully discharged before the system attempts to restart — this is a common issue in installations where power cycling is frequent and the amplifier capacitors have not fully discharged between cycles.

Frequently Asked Questions

Q: Can you supply FANUC PCBs for legacy CNC systems such as Series 0, Series 15, or Series 16? A: Yes. Legacy FANUC CNC boards are among our most requested components. Send us your part number — including the full A20B or A16B reference printed on the board label — and our team will locate the exact board or a confirmed compatible replacement.

Q: Do you supply individual internal PCBs for FANUC servo amplifiers, or only complete units? A: Both. For many FANUC amplifier models, replacing the individual internal power or control board is significantly more cost-effective than replacing the complete amplifier unit. Atlantech supplies individual boards (A20B, A16B series) as well as complete amplifier assemblies depending on your preference and the extent of the fault.

Q: Can you help identify a FANUC part number from a physical component without documentation? A: In most cases, yes. FANUC boards and motors carry the part number on a label affixed to the component. Send us a clear photograph of the label and we will identify the exact reference and check availability within 24 hours.

Is your CNC machine or robot cell down due to a failed PCB, servo amplifier, or encoder? Explore our FANUC catalogue or contact Atlantech Drives today for emergency sourcing and rapid quotes worldwide.