FANUC A20B-8200-0791 R-30iB Mate Main CPU PCB

Overview

The A20B-8200-0791 is a main CPU PCB in the A20B-8200 family. It is identified as R-30iB Mate Main PCB and R-30iB Mate Main CPU PCB, placing it at the center of the robot controller hardware rather than in a peripheral option-board position.

Listings for this model describe it as the board that stores programs and configurations and supports servo mechanism positioning, while also noting that horizontal option cards may be installed onto it.

This board represents the controller’s primary processing layer. In practical robot maintenance, that makes it a platform-critical replacement item: it carries processor, memory, and controller-side support circuits, so keeping the same board model is the safest way to preserve the installed controller structure and its option-board compatibility.

Technical Data

Applications

This board is suitable for installed FANUC R-30iB Mate robot controllers where the system already uses the A20B-8200-0791 main CPU board.

It is especially relevant in controller repair, CPU-board replacement, robot restoration, and long-term service support where the original controller platform and its option-board structure need to remain unchanged.

Replacement Guidance

Before ordering, confirm the installed board code directly on the controller and verify that the controller is an R-30iB Mate platform. Because this is the main CPU board, it is also important to confirm the installed option set, especially where Ethernet, vision, or force-sensor functions are present.

On a robot main CPU PCB, exact model continuity is one of the most important replacement checks.

FAQ

Q1: What kind of board is A20B-8200-0791?
It is an R-30iB Mate Main CPU PCB. This places it at the core of the robot controller rather than in the communication-card, display-board, or auxiliary-board category.

Q2: Why is the “Main CPU PCB” description important?
Because that description defines the board’s platform-level role. It indicates that the board is responsible for core controller processing and not just for one optional interface function.

In maintenance work, that makes exact model matching essential.

Q3: What functions are tied to this board?
Listings describe it as containing the microprocessor, peripheral circuits, memory, and the operator’s panel control circuit, while also linking it with servo mechanism positioning. Some references also note Ethernet, vision, and force-sensor interface options in the board family.

Q4: Is this board used with option cards?
Yes. Listings mention that various cards and module options may be installed horizontally onto the main board.

That is one reason why matching the correct main board is so important in robot controller service work.

Q5: What should be checked before buying?
Check the installed board label, confirm the controller is R-30iB Mate, verify the part number is A20B-8200-0791, and review any installed options or interface needs before replacement. Those checks help preserve the controller’s existing hardware structure.