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Brand | Fanuc |
Status | NEW/USED |
Warranty | 12 months/3 months |
Type | Servo PCB A20B-2100-0541 |
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-2100-0541 and A20B-2100-0542 mainboard PCB units are original replacement control boards engineered for stable, high-precision CNC system performance. These boards serve as core components in numerous Fanuc controller generations, ensuring reliable processing, high-speed communication, and system-level stability for industrial machining environments.
Designed for heavy-duty operation, these mainboards deliver exceptional performance in CNC lathes, milling machines, machining centers, and automated production lines where system downtime directly impacts production cost.
Both part numbers belong to Fanuc’s OEM lineup, built with military-grade PCB materials, precise copper layering, and highly durable soldering. This ensures long lifecycle performance even in high-vibration, high-temperature industrial environments.
These boards are commonly used in:
Fanuc Series 0i / 0i Mate
Fanuc Series 16i / 18i
Customized system variations used by top machine tool brands (DMG, Mori Seiki, Mazak, Doosan, Haas, etc.)
Compatibility may vary depending on software version and connected modules—contact us for verification.
The A20B-2100-0541 / 0542 mainboard manages:
CNC system logic computation
Servo/spindle communication handshake
I/O signal processing
Memory module control
High-speed bus communication
This ensures accurate command execution, rapid program processing, and low latency across all machine axes.
Depending on machine configuration, this board may interface with:
Fanuc PMC modules
I/O expansion boards
Memory and embedded DRAM
Servo/spindle amplifier modules
Operator panel boards
Common issues include:
Overvoltage or unstable power supply damaging onboard chips
Oil mist, coolant exposure, or dust contamination
Aging capacitors leading to boot failure
Burnt traces due to amplifier faults
Machine freeze, random alarms, or inconsistent startup behavior
Replacing the mainboard is typically required when:
The CNC system cannot power up
Alarms like “MAIN CPU ERROR” or “SYSTEM ALARM 000” appear
Memory cannot retain parameters
The machine intermittently shuts down
To ensure the correct board, customers should verify:
Machine Model & Control Series
Existing Board Part Number (Label on PCB)
Software/EPROM Version
Connected modules (I/O, PMC, memory)
We provide free compatibility checks—just send us a photo of your current board.
Always back up system parameters before swapping boards
Confirm grounding and cabinet ventilation to prevent future damage
Inspect power supply modules for instability (common root cause of failure)
Ensure no loose connectors or oxidized terminals
After installation, run system diagnostics and servo/spindle tests
It acts as the central processing hub for the Fanuc CNC system, handling computation, memory control, axis command distribution, and high-speed communication between servo, spindle, and I/O modules.
These two part numbers belong to the same functional family and are interchangeable in many machine configurations, but compatibility depends on system software version. Always confirm before purchasing.
Typical signs include:
System failing to boot
Sudden memory loss
CPU or system errors
Random alarms without mechanical triggers
Repaired boards may work but often have unstable components. For mission-critical production, original Fanuc boards are recommended due to reliability and longer service life.
In most cases, parameters must be restored and the system may require re-initialization. Our team provides remote guidance if needed.
✔ Direct supplier of original Fanuc spare parts
✔ Competitive pricing for OEM products
✔ Fast global shipping
✔ Professional technical support for CNC maintenance teams
✔ Inventory ready for urgent machine downtime situations
Weite Welcomes Your Inquiries for More Fanuc Parts