|
| Place of Origin | JAPAN |
| Brand Name | FANUC |
| Certification | CE ROHS |
| Model Number | A20B-8002-0040 |
The FANUC A20B-8002-0040 is publicly described as a RISC PCB or RISC CPU PCB for FANUC Series 16i, 18i, and 21i controls.
Public descriptions place it on the riser of the main i-Series control PCB, where it serves as an additional processing module rather than as a simple interface or panel board.
That board position gives the A20B-8002-0040 a more expansion-oriented role inside the CNC architecture.
Public descriptions connect it with enhanced processing tasks such as multi-axis control, multi-spindle management, and high-speed communication interfaces, which makes it especially relevant in more capable i-Series control configurations.
| Item | Specification |
|---|---|
| Part Number | A20B-8002-0040 |
| Brand | FANUC |
| Product Type | PCB |
| Board Role | RISC PCB / RISC CPU board |
| Control Family | 16i / 18i / 21i |
| Installation Context | Riser-mounted expansion board |
| Typical Use | Expansion, repair, replacement |
The A20B-8002-0040 is best suited to i-Series CNC expansion architecture, especially where the control uses an additional processing layer beyond a basic integrated setup.
Public descriptions specifically associate this board with multi-axis, multi-spindle, and communication-interface functions, so it fits applications where the machine depends on enhanced controller capability rather than minimal baseline control hardware.
For maintenance buyers, it is most relevant in repair of expanded 16i/18i/21i systems, processor-board replacement, and service support for machines that must retain their original i-Series board stack.
That practical application framing is an engineering interpretation of the board’s publicly described RISC expansion role.
Before replacing the A20B-8002-0040, technicians should confirm that the machine actually uses this riser-mounted RISC board configuration and that the fault is not located in the main motherboard, option interfaces, or surrounding connector stack.
Because public sources describe this board as an additional processor module, replacement should follow board-stack diagnosis rather than general PCB swapping.
During installation, exact model matching matters because a RISC expansion board is tied to a specific control family and board role.
After replacement, a good service check includes stable startup, normal recognition by the CNC system, and proper operation of any expanded functions the machine depends on, such as additional axis or spindle processing. The last point is an engineering inference based on the board’s public function description.
Q1: What is the A20B-8002-0040 used for?
It is publicly described as a RISC PCB for FANUC 16i, 18i, and 21i controls, used as an added processing board in the i-Series architecture.
Q2: Is this board the same as the main motherboard?
No. Public descriptions place it on the riser of the main control PCB and describe it as an additional processing module.
Q3: Why is it linked to multi-axis or multi-spindle functions?
Because the public board description explicitly connects it with extra computational support for multi-axis control, multi-spindle management, and communication interfaces.
Q4: What should be checked before replacing it?
Technicians should confirm the exact part number, verify the control family, inspect riser connections, and make sure the fault truly points to the RISC expansion board rather than adjacent boards. This is practical guidance based on its public role in the board stack.
Q5: Why not use a similar-looking PCB instead?
Because boards in this category are tied to specific processor roles and control-family implementations.
Public listings do not describe A20B-8002-0040 as a generic replacement board.
Contact Us at Any Time
