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Brand | Fanuc |
Status | NEW/USED |
Warranty | 12 months/3 months |
Type | Servo PCB A20B-2102-0640 |
High-precision control | Use advanced algorithms to achieve precise speed and position control and improve equipment performance. |
Efficient heat dissipation design | Optimize heat dissipation structure to ensure long-term stable operation and reduce failure rate. |
Modular integration | Compact design, easy to install and maintain, and supports flexible system expansion. |
The Fanuc A20B-2102-0640 is an original OEM CNC control board engineered for high-speed processing, precise communication handling, and long-term reliability in Fanuc automation systems. As a core logic board for various CNC controllers, it ensures stable signal transmission between the CPU, servo/spindle amplifiers, I/O modules, and operator interfaces—critical for achieving consistent machining accuracy and production uptime.
Manufactured to strict Fanuc quality standards, this board utilizes durable PCB materials, precision soldering technology, and industrial-grade components designed to withstand intensive operating conditions across lathes, milling machines, machining centers, and specialized CNC platforms.
The A20B-2102-0640 board supports:
Rapid system logic execution
Stable multi-axis signal handling
High-frequency communication between motion control devices
Reduced latency in servo and spindle command output
This contributes to smoother machining, faster cycle times, and improved part quality.
Engineered for rigorous production environments:
Heat-resistant multilayer PCB
Reinforced component mounting for vibration-heavy machines
Superior copper trace integrity for stable current flow
Corrosion-resistant connection points
This helps protect against common causes of failure such as thermal stress, voltage fluctuation, and oil mist infiltration.
The A20B-2102-0640 is used across various Fanuc controller generations, including models found in:
0i Series
16i / 18i / 21i controls
Customized OEM integrations
Machine tool builders may configure the board differently, so compatibility confirmation is recommended.
Technicians typically replace this board when encountering:
System boot failure or CPU communication alarms
Random resets or unstable CNC startup behavior
Loss of servo/spindle communication
I/O malfunction affecting machine operation
Burnt components or overheating in the control cabinet
These issues are often linked to aging circuitry, power supply fluctuations, or external electrical interference.
Before ordering, verify:
Existing board model number printed on the PCB
Control unit model and machine tool brand
Connected module types (I/O, PMC, memory units)
EPROM/software version compatibility
We offer free compatibility verification—simply send a photo of your current board.
Backup CNC parameters before replacement
Ensure the control cabinet is clean and dry to avoid contact failure
Check grounding and EMI shielding to prevent future electrical noise issues
Inspect servo/spindle amplifiers for faults that might damage the new board
Perform diagnostics after installation to validate communication signals
Proper installation protects both the CNC system and the new control board.
It manages core CNC logic functions, communication across system modules, and processing required for axis control, spindle command, and I/O coordination—making it essential for stable machine operation.
Symptoms include startup errors, intermittent I/O failures, overheating components, servo alarms, or the CNC failing to load its operating system.
While used or repaired boards may function, they often carry reliability risks due to aging components. OEM-new boards offer superior stability, service life, and diagnostic consistency.
Typically, you will restore backed-up parameters, then run diagnostic checks. Some systems may require configuration of attached I/O and interface modules.
Common causes include:
Voltage spikes or unstable power supply
Excessive heat or poor cabinet ventilation
Coolant or oil mist intrusion
Aging capacitors and solder joints
Preventive maintenance significantly reduces failure risk.
✔ Guaranteed original Fanuc parts
✔ Large inventory for urgent downtime replacement
✔ Competitive pricing with global shipping
✔ Experienced technicians for compatibility guidance
✔ Trusted supplier to factories, maintenance teams, and machine tool OEMs
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