FANUC A20B-8200-0581 31i-A5 Main PCB

Overview

The A20B-8200-0581 is a FANUC main PCB in the A20B-8200 series. Public product listings identify it directly as a 31i-A5 MAIN PCB, and FANUC-oriented industrial sources present it as a control-board level spare with a required core-exchange process.

That places it at the main-board level of the installed CNC system rather than in the accessory, sub-board, or signal-only category.

As a main PCB, this board is central to the installed control structure. In service work, boards in this category are selected by exact model and installed role because the main board defines the original platform position inside the machine control.

Keeping the same model helps preserve the existing control-board architecture and original hardware identity of the system.

Technical Data

Application Value

This board is suited to installed FANUC 31i-A5 control systems where the main-board position must remain aligned with the original CNC hardware.

It is especially relevant in board-level replacement, repair planning, and lifecycle support where the machine already depends on the 31i-A5 main-board structure.

Because the part is publicly identified as a 31i-A5 MAIN PCB, it should be matched as a central control-board spare rather than as a general PCB.

Keeping the same model helps preserve the installed control platform and board-family continuity inside the machine.

Selection Notes

The key checks are the exact part number, the A20B-8200 family, the public description 31i-A5 MAIN PCB, and any applicable core-exchange process attached to the part.

These are the main compatibility points supported by the available public references.

FAQ

Q1: What kind of board is A20B-8200-0581?
It is a FANUC main PCB. Public industrial listings identify it specifically as a 31i-A5 MAIN PCB, which makes it part of the central control-board structure of the installed CNC hardware.

Q2: Why is the “31i-A5 MAIN PCB” description important?
Because that description defines the board’s place in the system. A main PCB is not treated like a general-purpose spare board; it belongs to the control core of the installed machine. Public listings use that wording directly, which makes it the key product identity for this model.

Q3: What does the core-exchange note tell you?
Public FANUC-oriented parts listings state that a core exchange is required for this model.

That means the part is handled as a controlled board-level replacement item, which is common for important CNC main boards. 

It reinforces the fact that this is treated as a core hardware spare rather than a routine accessory.

Q4: Is this board related to the same main-board family as other A20B-8200 models?
Yes. Public listings identify A20B-8200-0581 within the A20B-8200 series and describe it specifically as a 31i-A5 main PCB.

That series identity is one of the main family-level checks when confirming the installed hardware.

Q5: What should be checked before ordering?
Check the installed part number, confirm the machine uses A20B-8200-0581, verify that the original board is the same 31i-A5 main PCB type, and confirm any core-exchange requirement with the supplier.

Those are the main compatibility points supported by the available public references.