FANUC A20B-8101-0790 6400 Series Drive Control PCB

Overview

The A20B-8101-0790 is a drive control PCB in the A20B-8101 family. Listings describe it as a 6400 SERIES DRIVE BOARD and PCB: SERVO AMPLIFIER CONTROL, while other parts channels identify it as a servo amp control circuit board used with A06B-6400 series 6-axis servo amplifiers.

That places the board firmly in the servo-amplifier control section rather than in the main controller, display, or communication-board category.

This board is used where the installed robot or drive system already depends on the 6400-series amplifier-control structure.

In maintenance practice, boards in this position are matched by exact amplifier family and exact board role because they directly affect the amplifier’s control logic inside the motion system.

Technical Data

Applications

This board is suited to installed FANUC robot drive systems that already use a 6400-series servo amplifier control structure. It is especially relevant in servo amplifier repair, drive-board replacement, and robot-controller maintenance where the original amplifier control path must remain unchanged.

Replacement Guidance

Before ordering, confirm the installed board code, verify that the robot controller and amplifier section use the 6400-series arrangement, and check that the original board is A20B-8101-0790 in the servo-amplifier control position. For drive-control boards, exact installed-family matching is one of the most important replacement checks.

FAQ

Q1: What kind of board is A20B-8101-0790?
It is a 6400-series servo amplifier control PCB. Listings describe it as a drive board and servo amp control circuit board, which places it in the amplifier-control section of the motion system rather than in the main CPU or network board category.

Q2: Why is the 6400-series description important?
Because the drive family is part of the board’s core identity. A servo-amplifier control board should remain matched to the same amplifier family already used in the installed hardware, and the 6400-series designation is one of the clearest compatibility markers for this model.

Q3: Which controllers is this board associated with?
Listings connect it with R-30iB, R-30iB Plus, R-30iB Mate, and R-30iB Mate Plus controller families. That gives it a clear installed-base context in FANUC robot-drive hardware.

Q4: Is this board the amplifier itself?
No. It is the control PCB used within the servo-amplifier hardware, not the complete amplifier assembly. That distinction matters because replacement planning must preserve both the board position and the amplifier family it belongs to.

Q5: What should be checked before buying?
Check the installed board code, confirm the system uses a 6400-series servo amplifier, and verify that the original control board is A20B-8101-0790. These are the main compatibility points for a correct drive-board replacement.