FANUC A20B-2004-0800 Servo Amplifier Gate Driver Board

Overview

The A20B-2004-0800 is a FANUC board-level spare in the A20B-2004 family. Public industrial listings describe it as a servo amplifier gate driver board, while other product listings in the same number range refer to it as a power supply board.

The repeated association with servo-amplifier hardware is consistent across public sources and places the board firmly in the drive section of the installed FANUC system.

Because this model is presented at the gate-driver / power-board level, it should be treated as a drive-side hardware component rather than a general control accessory. In repair work, boards in this category are selected by their exact hardware role inside the amplifier section, which is why part-number continuity matters.

Technical Data

Application Value

This board is suited to FANUC servo amplifier hardware where the installed drive section already uses the A20B-2004 family and where the original gate-driver or power-board function has to be preserved.

Public references repeatedly connect this part to servo-amplifier hardware, making it directly relevant to drive repair, board replacement, and amplifier restoration work.

Because the board is described publicly at the drive stage rather than at the CPU or I/O stage, it belongs in the machine’s servo-amplifier section.

Keeping the same board model helps preserve the installed drive-board role and the original amplifier hardware arrangement.

Selection Notes

The key checks are the exact part number, the A20B-2004 family, and the public identification of the board as a servo amplifier gate driver board or power supply board.

The associated board reference A350-2004-T804 is also useful when cross-checking the installed hardware.

FAQ

Q1: What kind of board is A20B-2004-0800?
It is a FANUC board publicly described as a servo amplifier gate driver board. Other listings in the same exact part number range also describe it as a power supply board, but both descriptions place it in the drive hardware section.

Q2: Why is the “gate driver board” description important?
Because that description defines the board’s function inside the amplifier. Public listings using that wording make it clear that the part belongs to the switching/control side of the servo amplifier section rather than to general control hardware.

Q3: Why do some sources call it a power supply board?
Some public sources group this part with other A20B-2004-08xx boards under a power supply board description.

Since the same part number is also described as a servo amplifier gate driver board, the safest identification is to match the exact installed board number and hardware position before replacement.

Q4: What does the board reference A350-2004-T804 help with?
Public listings include A350-2004-T804 as the associated board number for this model.

In service work, that secondary board code can help confirm that the physical board in the amplifier matches the intended spare.

Q5: What should be checked before ordering?
Check the installed part number, confirm the machine uses A20B-2004-0800, and verify that the original board in the amplifier section matches the same gate driver / power board role and associated board reference.

Those are the main compatibility points supported by the public listings for this model.