Need Fanuc Parts Details?
Weite Welcomes Your Inquiries for More Fanuc Parts
-
-
- EN
Brand | Fanuc |
Status | NEW/USED |
Warranty | 12 months/3 months |
Type | Power PCB A20B-2101-0870 |
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-2101-0040, A20B-2101-0041, A20B-2101-0042, and A20B-2101-0870 boards are essential OEM control PCBs used across a wide range of Fanuc CNC controller generations. Designed and manufactured in Japan, these boards ensure precise logic processing, stable power distribution, and robust communication between the CPU, servo/spindle amplifiers, and machine I/O systems.
Available in both brand-new and certified used conditions, these boards offer flexible options for CNC maintenance teams looking to restore system performance quickly while optimizing repair budgets.
These circuit boards support:
High-speed communication between CNC CPU and amplifier modules
Accurate logic execution for multi-axis machining operations
Low-latency signal routing for improved cycle times
Stable operation during continuous production shifts
This ensures superior machining accuracy, system responsiveness, and reduced downtime.
Key durability advantages:
Multi-layer heat-resistant PCB layout
Reinforced solder joints for vibration-heavy environments
Anti-oxidation connectors preventing communication failures
Industrial-grade capacitors and ICs designed for long service life
These features make the boards reliable in demanding machining environments with heat, electrical noise, and constant mechanical movement.
Commonly supported controllers include:
Fanuc 0i Series
Fanuc 16i / 18i / 21i Series
OEM-customized control units from major machine tool brands
Because system architecture may differ, compatibility verification is highly recommended prior to purchase.
Technicians often replace these boards when experiencing:
CNC system boot failure or random restarts
Servo/spindle communication errors
I/O malfunctions affecting part programs or machine movements
Electrical shorts, burnt components, or overheating
Frequent system alarms without mechanical cause
Failures frequently arise from:
Voltage instability
Contamination from coolant or oil mist
Aging electronic components
Insufficient cabinet ventilation
Before purchasing, confirm the following:
Exact part number printed on the PCB (0040/0041/0042/0870)
Machine tool model & CNC controller type
Connected modules (I/O, PMC, memory units)
Software or EPROM version compatibility
Our support team provides free compatibility checks—submit a photo of your current board or control unit label for fast verification.
Always back up system parameters prior to replacement
Check grounding and cabinet shielding to prevent EMI interference
Inspect power supply modules for fluctuations that may damage new boards
Clean connectors thoroughly before installation
After powering on, run CNC diagnostics to confirm stable communication
These steps help ensure trouble-free operation and extend the lifespan of your CNC controller.
These boards manage CNC logic processing, communication with servo/spindle drives, and overall control signal routing for the machine — essential for system stability and machining accuracy.
Certified used boards are fully tested and cost-effective, especially for older machines. However, new boards provide the longest life expectancy and highest reliability for high-production environments.
Key symptoms include:
Startup failures
Servo/spindle alarms
Unresponsive operator panel
Overheated PCB areas
Intermittent I/O or communication errors
Typically only parameter restoration is needed. EPROM or software compatibility should be confirmed before installation.
Common causes include:
Power surges
Excess heat in the electrical cabinet
Oil or coolant contamination
Aging capacitors or cracked solder joints
✔ Direct supplier of 100% original Japan-made Fanuc parts
✔ New and used inventory options with warranty
✔ Fast international shipping for urgent machine downtime
✔ Professional technical support for part identification
✔ Trusted by CNC repair centers, factories, and machine tool distributors worldwide
Weite Welcomes Your Inquiries for More Fanuc Parts