The FANUC A20B-0009-0320 is a legacy single-axis DC servo velocity-control PCB used as the upper control board in selected FANUC A06B-6047 M-Series velocity control units. It is a replacement board, not a complete servo drive or spindle-control PCB.

A20B-0009-0320 boards were produced in multiple revisions and configured through hardware jumpers. Confirm the complete PCB marking, revision, host A06B-6047 model and every jumper position before installation.

A20B-0009-0320 Product Information

Role in the A06B-6047 Servo Drive

The A20B-0009-0320 mounts above the power section of a compatible A06B-6047 DC velocity control unit. It processes axis-command and motor-feedback signals and controls the power stage. Voltage and current capacity are determined by the complete A06B-6047 unit, not by the PCB number alone.

Revision and Jumper Compatibility

The revision printed after the board number is important. /10D, /11D and /12D should not be assumed interchangeable solely because the base number matches. Record every jumper position before removal, then compare the replacement with the original board and machine documentation.

Testing and Replacement Checks

REACO CNC checks the label, revision, connectors, components, solder condition, power rails, feedback circuits, command processing and alarms as applicable. Confirm the drive model, board revision, jumper map, feedback type, connectors and CNC configuration before power-up.

Related resources: FANUC circuit boards and FANUC PCB and drive repair service.