FANUC A20B-2102-0643 is a servo drive side-panel control board installed inside compatible FANUC servo amplifier hardware. It supports internal signal processing, interfacing and control coordination within the host drive.

This listing covers the A20B-2102-0643 printed circuit board only, not a complete servo amplifier or power stage. Confirm the original board number, revision markings, connector layout and the full A06B model on the host unit before ordering.

A20B-2102-0643 Product Information

Servo Drive Control Function

The A20B-2102-0643 forms part of the host amplifier's low-power control section. It supports the internal control and interface paths required for servo operation, while the exact signals and functions depend on the complete amplifier configuration. It should not be treated as the drive's power-switching module.

Compatibility and Board Identification

Match A20B-2102-0643 exactly and compare any suffix or revision marking, connectors, mounting points and component layout. Related A20B-2102-0640, -0641, -0642, -0645, -0646 and -0647 boards are separate specifications and are not automatically interchangeable. The complete host A06B number remains essential for confirmation.

Testing and Installation Notes

REACO CNC checks the label, PCB condition, connectors, components and applicable control functions in a compatible test setup. Back up CNC and drive parameters before replacement. Qualified personnel should isolate power, wait for the DC bus to discharge and use ESD protection when handling the board.

Related resources: FANUC PCB boards, FANUC servo drives and FANUC CNC repair services.