1 PC Used Fanuc A20B-2100-0182 A20B21000182 A2OB-21OO-O182 PCB Board In Good Condition

FANUC A20B-2100-0182 | Servo Amplifier Control PCB Board

Part Number: A20B-2100-0182

Cross Reference: A20B21000182

Manufacturer: FANUC Ltd. (Japan)

Product Type: Servo Amplifier Control PCB — Drive Board 

About This Board

The A20B-2100-0182 is a servo amplifier control PCB from FANUC's A20B-2100 series — the family of drive boards used inside FANUC servo and spindle amplifier units. It handles signal-level control functions: processing velocity and torque commands from the CNC, conditioning encoder feedback, executing current regulation, and generating switching signals to the amplifier's power stage.

A20B-2100 series boards sit between the CNC's axis command output and the amplifier's IGBT power section. When this board fails, the amplifier loses its control logic and the axis goes offline. Drive alarms appearing immediately at power-on — before any run command — are the typical symptom.

Used boards in good working condition from verified sources are a practical and cost-effective solution for this part number, particularly where the amplifier's power stage is intact and only the control PCB needs replacement.

Key Specifications

FAQ

Q1: The FANUC servo amplifier shows a drive alarm immediately at power-on. Could the A20B-2100-0182 be the cause?

Yes. Alarms at power-on before any run command — particularly control-related alarm codes — point to the drive PCB rather than the motor or power stage. First verify 24V supply to the amplifier is within tolerance. If supply is confirmed good and the alarm persists, the A20B-2100-0182 has likely failed.

Q2: Is a used A20B-2100-0182 reliable for production use?

A used board that has been tested on a compatible amplifier test rig — confirming all control channels functional under simulated load conditions — is a reliable replacement. Request the supplier's test methodology before purchase. Boards described as "removed from closed plant, good working condition" are typically from decommissioned machines, not failed units.

Q3: Can the A20B-2100-0182 be replaced without replacing the power stage?

Yes. The control board and the power stage are separate assemblies. With the power stage confirmed intact (no IGBT short circuits), only the A20B-2100-0182 needs replacement. This is significantly more economical than replacing the entire amplifier.

Q4: The board label is unclear. How is the A20B-2100-0182 confirmed as the correct part?

Cross-reference the amplifier's unit model number (e.g., A06B-6096 or A06B-6114 series) against FANUC's amplifier PCB spare parts documentation. The specific A20B-2100 board variant is listed per amplifier model. Do not substitute an adjacent A20B-2100 number without this confirmation.

Q5: What ESD precautions apply when handling the A20B-2100-0182?

Handle with a grounded wrist strap on a conductive mat. Transport in metallised anti-static packaging. Avoid contact with synthetic clothing or ungrounded surfaces throughout handling, storage, and installation.