The FANUC A20B-2102-0433 is a power control circuit board for compatible FANUC CNC and drive assemblies. The component PCB includes large electrolytic capacitors, relays, control electronics and multiple connectors used for power-related control, circuit conditioning and communication with the surrounding unit.

Parts inventories also describe A20B-2102-0433 as a power board or servo-drive control PCB. It is a board-level replacement component, not a complete servo amplifier, power supply or CNC controller.

A20B-2102-0433 Product Information

Power and Drive-Control Function

A20B-2102-0433 supports power-related operation inside its host assembly. Its capacitors, switching and interface components condition local circuits and exchange control or status signals through the connected harnesses. Exact voltages, signal assignments and supported motor capacity are determined by the complete FANUC unit.

Replacement and Compatibility Checks

Confirm A20B-2102-0433 on the original PCB and match any printed revision. Compare the host amplifier or power-unit model, connector locations, capacitor ratings, relay and heatsink layout, PCB dimensions and mounting holes. Do not substitute A20B-2102-0431, A20B-2102-0420 or another A20B-2102 board without documented compatibility.

Testing and Installation Notes

REACO CNC checks the part marking, PCB traces, capacitors, relays, heatsinks, connectors, solder joints and power rails, followed by installed functional testing when a compatible assembly is available. Before replacement, isolate all power and allow the DC bus and onboard capacitors to discharge. Use ESD protection and inspect the host unit for damaged power components or cooling faults.

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