FANUC A20B-2101-0811 is a servo drive power backplane / power base board used inside compatible FANUC amplifier assemblies. It provides the mechanical base and high-current electrical interconnections between the drive power stage, terminals and related internal components.

This listing covers the A20B-2101-0811 board only, not a complete A06B servo amplifier. Because this PCB can appear with revision suffixes such as /03A, match the complete number printed on the original board and verify the host drive before replacement.

A20B-2101-0811 Product Information

Drive Power-Stage Function

The A20B-2101-0811 forms the internal connection platform for a FANUC servo drive power stage. It distributes power and control connections among installed power devices, bus connections and motor-output terminals. Electrical ratings, axis capacity and voltage class are determined by the complete amplifier, not by this board number alone.

Replacement and Revision Checks

Confirm A20B-2101-0811, the revision suffix and the complete A06B amplifier model. Compare the terminal layout, connectors, mounting points, component positions and any A350 manufacturing number visible on the original PCB. A20B-2101-0810, 0812 and other similar boards are separate configurations and are not automatically interchangeable.

Testing and Installation

REACO CNC checks the board marking, terminals, connectors, bus paths, solder joints, insulation, mounting hardware and signs of overheating, followed by functional testing where applicable. Qualified personnel should isolate incoming power and wait for the DC bus to discharge completely before opening the amplifier.

Related resources: FANUC circuit boards, FANUC servo drives and FANUC drive repair service.