New Original FANUC PCB Board A20B-1006-0110 A20B10060110

FANUC A20B-1006-0110 | Servo Amplifier Base Power Board — A06B-6076 Robot Drive Series / Rev. /03A 

Power Foundation of the A06B-6076 Robot Drive

The A20B-1006-0110 is the base board — the power board — in FANUC's A06B-6076 series servo amplifier modules used in the R-J and R-J2 robot controller generations. Inside the A06B-6076 amplifier, the hardware splits between two primary boards: the top board (A16B-2100-0110), which handles the servo command processing and control interface, and the base board (A20B-1006-0110), which handles the power stage interface — gate drive circuits, current sensing, DC bus connections, and the physical mounting for the daughter modules that configure the amplifier's axis function.

The A20B-1006-0110 is the host for the A20B-2902-0550 daughter modules. These small plug-in cards carry the axis-specific drive function circuitry that sits between the base board's bus and the power transistors. The base board without its daughter modules is mechanically and electrically incomplete — the full amplifier function requires the base board, its daughter modules, and the top board working together.

A robot drive fault that presents as a power stage alarm — overcurrent, transistor fault, phase fault — during motor operation rather than at idle or startup points to the base board or its daughter modules as the likely fault location. The top board is the more likely suspect when communication alarms or initialisation failures occur at startup before any motion is commanded.

Key Specifications

Base Board + Daughter Modules — Unit or Component?

The A20B-1006-0110 base board is frequently listed and sold with its A20B-2902-0550 daughter modules already installed — effectively as a complete sub-assembly of the A06B-6076 amplifier's lower section. When sourcing through the aftermarket, confirm whether the listing includes the daughter modules or supplies only the bare base board. The daughter modules are required for the amplifier to function and are the components most likely to fail within the drive's power stage.

FAQ

Q1: What is the difference between the A20B-1006-0110 base board and the A16B-2100-0110 top board?

The A20B-1006-0110 base board hosts the power stage functions — gate drive signals, current sensing, daughter module mounting, and DC bus interface. The A16B-2100-0110 top board handles servo control functions — receiving motion commands from the robot controller and closing the servo feedback loop. Both are required for a functional A06B-6076 amplifier. They can be sourced and replaced independently; confirm which board is the fault source before ordering.

Q2: What robot controller generations use the A06B-6076 servo amplifier with this base board?

The A06B-6076 series servo amplifiers were used in FANUC R-J and R-J2 series robot controllers — the robot controller generations that preceded the R-J3 and R-30i series. Machines with R-J and R-J2 controllers that still run in production environments depend on the A06B-6076 aftermarket for drive board components including the A20B-1006-0110.

Q3: Are the daughter modules (A20B-2902-0550) interchangeable between different A06B-6076 drive variants?

The A20B-2902-0550 daughter modules are the axis-specific drive components on the base board. In an A06B-6076-H101 (single-axis), the base board carries a specific number and configuration of modules; a multi-axis variant (H102, H103) carries more. Confirm the daughter module configuration from the specific A06B-6076 variant installed in the robot before sourcing replacement base board assemblies.

Q4: Can the A20B-1006-0110 base board be repaired?

Board-level repair is available through FANUC robot drive specialist repair services. Common failure points include the daughter module contacts, gate drive ICs, current sensing circuitry, and protection components on the DC bus interface. Repair centres with A06B-6076 test equipment can verify the repaired base board under realistic motor load conditions before return.

Q5: Where is the A20B-1006-0110 sourced after discontinuation?

Through the FANUC robot drive aftermarket — R-J/R-J2 robot parts specialists, FANUC drive repair centres, and tested surplus suppliers. Confirm the /03A revision from the installed board's label. Request confirmation that the A20B-2902-0550 daughter modules are included and that the complete assembly has been functionally tested before accepting a used or refurbished unit.